CN1204052C - Method for producing light active calcium carbonate - Google Patents
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Abstract
本发明公开了一种轻质活性碳酸钙的生产方法，在轻质碳酸钙或沉淀碳酸钙的生产工艺中，在碳酸化反应前或碳酸化反应过程中加入表面处理剂，所述表面处理剂由水不溶性脂肪酸盐、表面润湿剂和水组成，所述表面润湿剂为水溶性C1～C5低级醇或水溶性C2～C5低级醚，然后通过碳酸化反应生成碳酸钙乳液，所述碳酸钙乳液经过脱水、干燥、粉碎和包装即得成品轻质活性碳酸钙。本发明的生产方法中表面处理剂高度分散于轻质碳酸钙中，抑制碳酸钙晶体生长和二次聚集，所以生产的轻质活性碳酸钙具有粒径均一、分散性良好、与有机高聚物有很好的亲和性和热稳定性，应用塑料时可增加填充量，减少热稳定剂的使用量。The invention discloses a production method of light active calcium carbonate. In the production process of light calcium carbonate or precipitated calcium carbonate, a surface treatment agent is added before or during the carbonation reaction, and the surface treatment agent It is composed of water-insoluble fatty acid salt, surface wetting agent and water. The surface wetting agent is water-soluble C1-C5 lower alcohol or water-soluble C2-C5 lower-level ether, and then generates calcium carbonate emulsion through carbonation reaction. The calcium carbonate emulsion is dehydrated, dried, pulverized and packaged to obtain the finished light active calcium carbonate. In the production method of the present invention, the surface treatment agent is highly dispersed in light calcium carbonate, which inhibits calcium carbonate crystal growth and secondary aggregation, so the light active calcium carbonate produced has uniform particle size, good dispersibility, and organic high polymer It has good affinity and thermal stability. When applying plastics, it can increase the filling amount and reduce the amount of heat stabilizer used.
Description
技术领域Technical field
本发明涉及碳酸钙的生产方法，具体地说是一种轻质活性碳酸钙的生产方法。The invention relates to a production method of calcium carbonate, in particular to a production method of light active calcium carbonate.
背景技术 Background technique
碳酸钙是一种很重要的无机化工产品，被广泛地应用于橡胶、塑料、造纸、涂料、油墨、医药等工业中。普通碳酸钙亲水疏油的性质使得碳酸钙与有机高聚物的亲和性差、易形成聚集体，造成高聚物内部缺陷、力学性能变差，因此作为填充剂，仅起到增量及降低成本的作用。而对碳酸钙进行表面处理后即为活性碳酸钙在橡胶、塑料制品中的分散性能良好，填充量大，制品表面光艳、力学性能改善，是优良的白色补强型填料，使高档油墨、涂料具有良好的光泽，透明、稳定、快干等特性。Calcium carbonate is a very important inorganic chemical product, which is widely used in industries such as rubber, plastics, paper, paint, ink, and medicine. The hydrophilic and oleophobic nature of ordinary calcium carbonate makes the affinity between calcium carbonate and organic polymers poor, and it is easy to form aggregates, resulting in internal defects of polymers and poor mechanical properties. Therefore, as a filler, it only serves as a filler and The effect of reducing costs. After the surface treatment of calcium carbonate, the dispersibility of active calcium carbonate in rubber and plastic products is good, the filling amount is large, the surface of the product is bright, and the mechanical properties are improved. It is an excellent white reinforcing filler, making high-grade inks, coatings It has good gloss, transparency, stability, and quick drying.
轻质碳酸钙或沉淀碳酸钙的生产工艺特征说明：石灰石经过窑煅烧分解成为生石灰和二氧化碳，生石灰经过水消化精制成氢氧化钙乳液，二氧化碳经过洗涤和压缩。将二氧化碳和氢氧化钙乳液在一定的控制条件下进行碳酸化反应为碳酸钙。生产的碳酸钙乳液经过脱水、干燥、粉碎和包装即成为成品轻质碳酸钙。Description of the production process characteristics of light calcium carbonate or precipitated calcium carbonate: limestone is decomposed into quicklime and carbon dioxide after kiln calcination, quicklime is digested and refined with water to make calcium hydroxide emulsion, and carbon dioxide is washed and compressed. Carbon dioxide and calcium hydroxide emulsion are subjected to carbonation reaction under certain control conditions to form calcium carbonate. The produced calcium carbonate emulsion becomes finished light calcium carbonate after dehydration, drying, crushing and packaging.
有关的化学反应方程式为：
通过工艺条件的控制如浓度、温度、碳酸化方式及碳酸化过程中的添加剂的不同生产出不同粒径(如微细、超细、纳米等)和不同形状(立方体、片状、球状等)轻质碳酸钙。Through the control of process conditions such as concentration, temperature, carbonation method and different additives in the carbonation process, different particle sizes (such as micro, ultra-fine, nano, etc.) quality calcium carbonate.
为了改善其应用性能而进行表面处理即成为各种轻质活性碳酸钙，按实现轻质活性碳酸钙的工艺方式目前为两类即一是干法生产轻质活性碳酸钙，将成品或已干燥粉碎的轻质碳酸钙粉体与表面处理剂在一定温度和比例下捏合固相活化反应而得，特点工艺简单、生产成本低，但粒径大、分散性差、应用性能改善效果不明显。另一是湿法生产轻质活性碳酸钙，在已碳酸化完成的碳酸钙乳液中加入表面处理剂在一定温度、浓度和比例下液相活化反应而得特点粒径小、分布较均匀、分散性较好、应用性能明显改善，但工艺过程长、投资大、电耗能耗高。从目前实现轻质活性碳酸钙的工艺方式看其共同特征是对碳酸化反应完成后的碳酸钙进行表面处理而得。In order to improve its application performance, surface treatment can become various light active calcium carbonate. According to the process of realizing light active calcium carbonate, there are currently two types, that is, one is dry production of light active calcium carbonate, and the finished product or dried The pulverized light calcium carbonate powder and the surface treatment agent are obtained by kneading solid-phase activation reaction at a certain temperature and ratio. The characteristics are simple process and low production cost, but the particle size is large, the dispersion is poor, and the application performance improvement effect is not obvious. The other is the production of light active calcium carbonate by wet method, adding a surface treatment agent to the calcium carbonate emulsion that has been carbonated and activating it in a liquid phase at a certain temperature, concentration and ratio to obtain the characteristics of small particle size, uniform distribution, and dispersion It has good performance and obvious improvement in application performance, but the process is long, the investment is large, and the power consumption and energy consumption are high. Judging from the current process of realizing light active calcium carbonate, the common feature is that the calcium carbonate after the carbonation reaction is completed is obtained by surface treatment.
在生产轻质活性碳酸钙的另一要素是表面处理剂，目前涉及表面处理剂主要有：脂肪酸、树脂酸及其碱金属盐类、酯类，高级脂肪醇和醚类，各种表面活性剂，金属酯偶联剂类、高分子处理剂等。Another element in the production of light activated calcium carbonate is the surface treatment agent. Currently, the surface treatment agents mainly include: fatty acids, resin acids and their alkali metal salts, esters, higher fatty alcohols and ethers, various surfactants, Metal ester coupling agents, polymer treatment agents, etc.
发明内容Contents of Invention
本发明的目的在于提供一种轻质活性碳酸钙的生产方法，是在轻质碳酸钙或沉淀碳酸钙的生产工艺过程中在碳酸化反应前或碳酸化反应过程中加入表面处理剂，通二氧化碳将已含有表面处理剂的氢氧化钙乳液在一定的控制工艺条件下进行碳酸化反应为碳酸钙。The object of the present invention is to provide a kind of production method of light active calcium carbonate, is to add surface treatment agent before carbonation reaction or during carbonation reaction in the production process of light calcium carbonate or precipitated calcium carbonate, pass carbon dioxide The calcium hydroxide emulsion containing the surface treatment agent is subjected to carbonation reaction under certain control process conditions to form calcium carbonate.
为了达到上述目的，本发明采用的技术方案如下：In order to achieve the above object, the technical scheme adopted in the present invention is as follows:
本发明的技术方案1：在轻质碳酸钙或沉淀碳酸钙的生产工艺中，在碳酸化反应前或碳酸化反应过程中加入表面处理剂，所述表面处理剂由水不溶性脂肪酸盐、表面润湿剂和水组成，所述表面润湿剂为水溶性C1～C5低级醇或水溶性C2～C5低级醚，然后通过碳酸化反应生成碳酸钙乳液，所述碳酸钙乳液经过脱水、干燥、粉碎和包装即得成品轻质活性碳酸钙。Technical scheme 1 of the present invention: in the production technology of light calcium carbonate or precipitated calcium carbonate, add surface treatment agent before carbonation reaction or carbonation reaction process, described surface treatment agent is made of water-insoluble fatty acid salt, surface Composed of wetting agent and water, the surface wetting agent is water-soluble C1-C5 lower alcohol or water-soluble C2-C5 lower ether, and then generates calcium carbonate emulsion through carbonation reaction, and the calcium carbonate emulsion is dehydrated, dried, Crushed and packaged to get the finished light active calcium carbonate.
本发明的技术方案2：在碳酸化反应前或碳酸化反应过程中，将水不溶性脂肪酸盐和表面润湿剂直接加入未碳酸化的氢氧化钙浆液或未碳酸化完全的氢氧化钙和碳酸钙浆液中，所述表面润湿剂为水溶性C1～C5低级醇或水溶性C2～C5低级醚，然后通过碳酸化反应生成碳酸钙乳液，所述碳酸钙乳液经过脱水、干燥、粉碎和包装即得成品轻质活性碳酸钙。Technical scheme 2 of the present invention: before the carbonation reaction or in the carbonation reaction process, water-insoluble fatty acid salt and surface wetting agent are directly added to uncarbonated calcium hydroxide slurry or uncarbonated complete calcium hydroxide and In the calcium carbonate slurry, the surface wetting agent is a water-soluble C1-C5 lower alcohol or a water-soluble C2-C5 lower ether, and then generates a calcium carbonate emulsion through carbonation reaction, and the calcium carbonate emulsion is dehydrated, dried, pulverized and The finished product light activated calcium carbonate can be obtained immediately after packing.
相对成品轻质碳酸钙的重量百分比计，所述水不溶性脂肪酸盐量的优选范围为0.50～10％，表面润湿剂量的优选范围为0.17～10％；所述水不溶性脂肪酸盐优选的是镁盐、钙盐、铅盐、锌盐、铝盐、钡盐或其混合复合物，所述水不溶性脂肪酸盐中的脂肪酸根所含的碳原子数优选的是12-22；所述水溶性低级醇优选的是乙醇或异丙醇，所述水溶性低级醚优选的是乙醚。所述水不溶性脂肪酸盐以单一脂肪酸盐或多种脂肪酸盐复合使用。Relative to the weight percentage of the finished light calcium carbonate, the preferred range of the water-insoluble fatty acid salt is 0.50-10%, and the preferred range of the surface wetting dosage is 0.17-10%; the preferred water-insoluble fatty acid salt It is a magnesium salt, calcium salt, lead salt, zinc salt, aluminum salt, barium salt or a mixed compound thereof, and the number of carbon atoms contained in the fatty acid radical in the water-insoluble fatty acid salt is preferably 12-22; The water-soluble lower alcohol is preferably ethanol or isopropanol, and the water-soluble lower ether is preferably diethyl ether. The water-insoluble fatty acid salt is used as a single fatty acid salt or multiple fatty acid salts in combination.
本发明具有的有益效果是：是在轻质碳酸钙或沉淀碳酸钙的生产工艺中在碳酸化反应前或碳酸化反应过程中加入由水不溶性脂肪酸盐、醇或醚类表面润湿剂和水组成的表面处理剂；或在轻质碳酸钙或沉淀碳酸钙的生产工艺中将表面处理剂中的水不溶性脂肪酸盐、醇或醚类表面润湿剂直接加入未碳酸化的氢氧化钙浆液或未碳酸化完全的氢氧化钙和碳酸钙浆液中，然后通过碳酸化反应为碳酸钙乳液经过脱水、干燥、粉碎和包装即得成品轻质活性碳酸钙。本发明的生产方法中表面处理剂高度分散于轻质碳酸钙中，抑制碳酸钙晶体生长和二次聚集，所以生产的轻质活性碳酸钙具有粒径均一、分散性良好、与有机高聚物有很好的亲和性和热稳定性，应用塑料时可增加填充量，减少热稳定剂的使用量。The present invention has the beneficial effects that: in the production process of light calcium carbonate or precipitated calcium carbonate, water-insoluble fatty acid salt, alcohol or ether surface wetting agent and A surface treatment agent composed of water; or in the production process of light calcium carbonate or precipitated calcium carbonate, the water-insoluble fatty acid salt, alcohol or ether surface wetting agent in the surface treatment agent is directly added to uncarbonated calcium hydroxide Slurry or not fully carbonated calcium hydroxide and calcium carbonate slurry, and then through carbonation reaction to calcium carbonate emulsion after dehydration, drying, crushing and packaging to obtain the finished light active calcium carbonate. In the production method of the present invention, the surface treatment agent is highly dispersed in light calcium carbonate, which inhibits calcium carbonate crystal growth and secondary aggregation, so the light active calcium carbonate produced has uniform particle size, good dispersibility, and organic high polymer It has good affinity and thermal stability. When applying plastics, it can increase the filling amount and reduce the amount of heat stabilizer used.
附图说明Description of drawings
图1描述了本发明生产的高分散性活性轻质碳酸钙的形貌。Fig. 1 has described the appearance of the highly dispersed active light calcium carbonate that the present invention produces.
图2描述了为传统湿法生产的活性轻质碳酸钙。Figure 2 depicts activated light calcium carbonate produced for the conventional wet process.
具体实施方式 Detailed ways
在轻质碳酸钙或沉淀碳酸钙的生产工艺中，在碳酸化反应前或碳酸化反应过程中加入表面处理剂，所述表面处理剂由水不溶性脂肪酸盐、表面润湿剂和水组成，所述表面润湿剂为水溶性低级醇C1～C5或水溶性C2～C5低级醚，然后通过碳酸化反应生成碳酸钙乳液，所述碳酸钙乳液经过脱水、干燥、粉碎和包装即得成品轻质活性碳酸钙。或者在碳酸化反应前或碳酸化反应过程中，将水不溶性脂肪酸盐、表面润湿剂直接加入未碳酸化的氢氧化钙浆液或未碳酸化完全的氢氧化钙和碳酸钙浆液中，所述表面润湿剂为水溶性C1～C5低级醇或水溶性C2～C5低级醚，然后通过碳酸化反应生成碳酸钙乳液，所述碳酸钙乳液经过脱水、干燥、粉碎和包装即得成品轻质活性碳酸钙。In the production process of light calcium carbonate or precipitated calcium carbonate, a surface treatment agent is added before the carbonation reaction or during the carbonation reaction, and the surface treatment agent is composed of a water-insoluble fatty acid salt, a surface wetting agent and water, The surface wetting agent is water-soluble lower alcohol C 1 -C 5 or water-soluble C 2 -C 5 lower ether, and then generates calcium carbonate emulsion through carbonation reaction, and the calcium carbonate emulsion is dehydrated, dried, pulverized and packaged That is the finished light active calcium carbonate. Or before the carbonation reaction or in the carbonation reaction process, the water-insoluble fatty acid salt and the surface wetting agent are directly added in the uncarbonated calcium hydroxide slurry or the calcium hydroxide and calcium carbonate slurry not completely carbonated, so The above-mentioned surface wetting agent is water-soluble C 1 ~ C 5 lower alcohol or water-soluble C 2 ~ C 5 lower ether, and then generates calcium carbonate emulsion through carbonation reaction, and the calcium carbonate emulsion is dehydrated, dried, pulverized and packaged. The finished light activated calcium carbonate is obtained.
所述水不溶性脂肪酸盐中的脂肪酸所含的碳原子数优选为12-22，脂肪酸可以是单一的或混合的，工业级常是多种脂肪酸复合的；水不溶性脂肪酸盐为金属镁盐、钙盐、铅盐、锌盐、铝盐或钡盐，使用时可以是单一脂肪酸盐或多种脂肪酸盐复合。The number of carbon atoms contained in the fatty acid in the water-insoluble fatty acid salt is preferably 12-22, the fatty acid can be single or mixed, and the industrial grade is often a composite of multiple fatty acids; the water-insoluble fatty acid salt is metal magnesium salt , calcium salt, lead salt, zinc salt, aluminum salt or barium salt, can be a single fatty acid salt or multiple fatty acid salts when used.
为改善这些水不溶性脂肪酸盐对水的润湿，以便能高度分散在氢氧化钙乳液或已部分生成碳酸钙的氢氧化钙乳液中，使用水溶性低级醇C1～C5或水溶性低级醚C2～C5为表面润湿剂。In order to improve the wetting of these water-insoluble fatty acid salts to water so that they can be highly dispersed in calcium hydroxide emulsion or calcium hydroxide emulsion that has partially generated calcium carbonate, use water-soluble lower alcohol C 1 ~ C 5 or water-soluble lower alcohol Ethers C 2 -C 5 are surface wetting agents.
也可使用未干燥的含水水不溶性脂肪酸盐，再加入表面润湿剂，则水不溶性脂肪酸盐能更好分散于氢氧化钙乳液或已部分生成碳酸钙的氢氧化钙乳液中。Undried water-containing water-insoluble fatty acid salt can also be used, and then adding a surface wetting agent, the water-insoluble fatty acid salt can be better dispersed in calcium hydroxide emulsion or calcium hydroxide emulsion that has partially generated calcium carbonate.
为了改善轻质活性碳酸钙的性能可以加入其他添加剂如结晶控制剂、偶联剂等。In order to improve the performance of light activated calcium carbonate, other additives such as crystallization control agent and coupling agent can be added.
本发明生产轻质(沉淀)活性碳酸钙的方法中所述水不溶性脂肪酸盐和水溶性低级醇或水溶性低级醚的用量，按相对成品轻质碳酸钙的百分含量(重量)计：The present invention produces the consumption of described water-insoluble fatty acid salt and water-soluble lower alcohol or water-soluble lower ether in the method for light (precipitation) active calcium carbonate, by the percentage composition (weight) of relative finished product light calcium carbonate:
碳酸钙 100Calcium Carbonate 100
水不溶性脂肪酸盐 0.50～10 ,
水溶性低级醇或水溶性低级醚 0.17～10Low -grade alcohol or water -soluble low -grade ether 0.17 ～ 10
实施例1Example 1
按传统的轻质碳酸钙生产工艺，石灰经水消化精制，在10m3精制的氢氧化钙乳液(分析氢氧化钙含量为200g/L)中加入湿硬脂酸钙(含水30％wt)75Kg(加入量约为成品碳酸钙重量的2％)，充分搅拌均匀，泵入碳化塔，然后通净化的二氧化碳(20-35％)气体进行碳酸化反应至浆液的pH＝7-8(即酚酞不变红)，成为含硬脂酸钙的碳酸钙乳液，经过脱水、在100-200℃下干燥、粉碎和包装即得成品轻质活性碳酸钙2.5吨。产品经分析达到HG/T 2567-94一级品。平均粒径为3.52μm.。According to the traditional light calcium carbonate production process, lime is digested and refined by water, and 75Kg of wet calcium stearate (moisture content 30%wt) is added in 10m3 of refined calcium hydroxide emulsion (calcium hydroxide content is 200g/L for analysis). (addition is about 2% of finished product calcium carbonate weight), fully stirs, is pumped into carbonization tower, then passes through the carbon dioxide (20-35%) gas of purification to carry out carbonation reaction to the pH=7-8 of slurry (being phenolphthalein Not reddening), become the calcium carbonate emulsion containing calcium stearate, through dehydration, at 100-200 ℃, drying, pulverizing and packaging promptly get 2.5 tons of finished product light activated calcium carbonate. The product has been analyzed to reach the first-grade product of HG/T 2567-94. The average particle size is 3.52 μm.
实施例2Example 2
按传统的轻质碳酸钙生产工艺，石灰经水消化精制，在10m3精制的氢氧化钙乳液(分析氢氧化钙含量为200g/L)中加入的湿硬脂酸钙锌复合物(钙锌比为1，含水35％wt)40Kg(加入量约为成品碳酸钙重量的1％)和乙醇30Kg(加入量约为成品碳酸钙重量的1.1％)，充分搅拌均匀，泵入碳化塔，然后通净化的二氧化碳(20-35％)气体进行碳酸化反应至浆液的pH＝7-8(即酚酞不变红)，成为含硬脂酸钙锌的碳酸钙乳液，经过脱水、在100-200℃下干燥、粉碎和包装即得成品轻质活性碳酸钙2.5吨。产品经分析达到HG/T 2567-94一级品。平均粒径为3.63μm。According to the traditional light calcium carbonate production process, the lime is digested and refined by water, and the wet calcium zinc stearate (calcium zinc compound) added in 10m 3 refined calcium hydroxide emulsion (calcium hydroxide content is 200g/L) Ratio is 1, water content 35%wt) 40Kg (addition is about 1% of finished product calcium carbonate weight) and ethanol 30Kg (addition is about 1.1% of finished product calcium carbonate weight), fully stirs, pumps into carbonization tower, then Purified carbon dioxide (20-35%) gas carries out carbonation reaction to the pH=7-8 of slurry (that is, phenolphthalein does not change red), and becomes calcium carbonate emulsion containing calcium stearate zinc, through dehydration, at 100-200 2.5 tons of finished light activated calcium carbonate were obtained by drying, pulverizing and packing at ℃. The product has been analyzed to reach the first-grade product of HG/T 2567-94. The average particle diameter is 3.63 μm.
实施例3Example 3
(1)表面处理剂的制备：在普通搅拌釜中加入硬脂酸钙(加入量为碳酸钙重量的2％)，再加入二份之一硬脂酸钙量的乙醇和适量水，充分搅拌成浆，配成含固量约为40％的浆液。(1) Preparation of surface treatment agent: add calcium stearate (addition is 2% of calcium carbonate weight) in common stirred tank, then add the ethanol of 1/2 calcium stearate amount and appropriate amount of water, fully stir Slurry is made into a slurry with a solid content of about 40%.
(2)普通轻质活性碳酸钙的制备：按传统的轻质碳酸钙生产工艺在精制的氢氧化钙乳液中加入上表面处理剂，充分搅拌均匀，泵入碳化塔通二氧化碳在一定的控制工艺条件下进行碳酸化反应为碳酸钙乳液，经过脱水、干燥、粉碎和包装即成为成品轻质活性碳酸钙。产品经分析达到HG/T 2567-94一级品，产品比实施例1、2有更好的分散性，平均粒径为2.85μm(见附图1)。(2) Preparation of ordinary light calcium carbonate: according to the traditional production process of light calcium carbonate, add the upper surface treatment agent into the refined calcium hydroxide emulsion, stir well, and pump carbon dioxide into the carbonization tower under a certain control process Carry out carbonation reaction under certain conditions to form calcium carbonate emulsion, after dehydration, drying, crushing and packaging, it becomes the finished light activated calcium carbonate. Product reaches HG/T 2567-94 first grade product through analysis, and product has better dispersibility than embodiment 1, 2, and average particle diameter is 2.85 μ m (seeing accompanying drawing 1).
实施例4Example 4
(1)表面处理剂的制备：在普通搅拌釜中加入硬脂酸钙(加入量为碳酸钙重量的0.5％)，再加入三份之一硬脂酸钙量的乙醚和适量水，充分搅拌成浆，配成含固量约为40％的浆液。(1) Preparation of surface treatment agent: add calcium stearate (addition is 0.5% of calcium carbonate weight) in common stirred tank, then add the ethyl ether of 1/3 calcium stearate amount and appropriate amount of water, fully stir Slurry is made into a slurry with a solid content of about 40%.
(2)普通轻质活性碳酸钙的制备：按传统的轻质碳酸钙生产工艺将精制的氢氧化钙乳液泵入碳化塔通二氧化碳在一定的控制工艺条件下进行碳酸化反应，5分钟后加入表面处理剂继续碳酸化反应至反应完全为碳酸钙乳液，经过脱水、干燥、粉碎和包装即成为成品轻质活性碳酸钙。产品经分析达到HG/T2567-94一级品，产品比实施例1、2有更好的分散性，平均粒径为3.05μm。(2) Preparation of common light calcium carbonate: according to the traditional light calcium carbonate production process, the refined calcium hydroxide emulsion is pumped into the carbonization tower to carry out the carbonation reaction with carbon dioxide under certain control process conditions, and after 5 minutes, add The surface treatment agent continues the carbonation reaction until the reaction is complete to form a calcium carbonate emulsion, and after dehydration, drying, crushing and packaging, it becomes the finished light activated calcium carbonate. The product reaches HG/T2567-94 first-class product through analysis, and the product has better dispersibility than Examples 1 and 2, and the average particle size is 3.05 μm.
实施例5Example 5
(1)表面处理剂的制备：在普通搅拌釜中加入硬脂酸钙和硬脂酸铅(比例为2∶1)(加入量为碳酸钙重量的3％)，再加入等量硬脂酸盐量的乙醇和适量水，充分搅拌成浆，配成含固量约为20％的浆液。(1) Preparation of surface treatment agent: add calcium stearate and lead stearate (ratio is 2: 1) (add-on is 3% of calcium carbonate weight) in common stirred tank, then add equivalent stearic acid Ethanol with a certain amount of salt and an appropriate amount of water are fully stirred into a slurry to form a slurry with a solid content of about 20%.
(2)普通轻质活性碳酸钙的制备：按传统的轻质碳酸钙生产工艺在精制的氢氧化钙乳液中加入上表面处理剂，充分搅拌均匀，泵入碳化塔通二氧化碳在一定的控制工艺条件下进行碳酸化反应为碳酸钙乳液，经过脱水、干燥、粉碎和包装即成为成品轻质活性碳酸钙。产品经分析达到HG/T 2567-94一级品，产品比实施例1、2有更好的分散性，平均粒径为3.13μm。(2) Preparation of ordinary light calcium carbonate: according to the traditional production process of light calcium carbonate, add the upper surface treatment agent into the refined calcium hydroxide emulsion, stir well, and pump carbon dioxide into the carbonization tower under a certain control process Carry out carbonation reaction under certain conditions to form calcium carbonate emulsion, after dehydration, drying, crushing and packaging, it becomes the finished light activated calcium carbonate. The product reaches HG/T 2567-94 first grade product through analysis, and product has better dispersibility than embodiment 1, 2, and average particle size is 3.13 μ m.
实施例6Example 6
(1)表面处理剂的制备；在普通搅拌釜中加入硬脂酸钙和硬脂酸锌(比例为1∶2)(加入量为碳酸钙重量的6％)，再加入等量硬脂酸盐量的异丙醇和适量水，充分搅拌成浆，配成含固量约为40％的浆液。(1) preparation of surface treatment agent; add calcium stearate and zinc stearate (ratio is 1: 2) (add-on is 6% of calcium carbonate weight) in common stirred tank, then add equivalent stearic acid The isopropanol of the amount of salt and the appropriate amount of water are fully stirred into a slurry to form a slurry with a solid content of about 40%.
(2)超细活性碳酸钙的制备：石灰经水消化精制，取5m3精制的氢氧化钙乳液(分析氢氧化钙含量为108g/L)加入上表面处理剂，充分搅拌均匀，泵入有搅拌(转速为120转/分)的碳化塔，然后通净化的二氧化碳(20-35％)气体搅拌下进行碳酸化反应，控制反应温度为15-25℃至浆液的pH＝7-8(即酚酞不变红)，成为含表面处理剂的超细碳酸钙乳液，经过脱水、闪蒸干燥、粉碎和包装即得成品超细活性碳酸钙0.71吨。产品经分析达到工业超细活性碳酸钙HG/T2776-96标准的一等品。(2) Preparation of ultrafine active calcium carbonate: Lime is digested and refined by water, and 5m of refined calcium hydroxide emulsion (calcium hydroxide content is analyzed as 108g/L) is added to the upper surface treatment agent, fully stirred evenly, and pumped into the Stirring (rotating speed is 120 rev/min) carbonization tower, then carry out carbonation reaction under the gas stirring of passing purified carbon dioxide (20-35%), control the reaction temperature to be 15-25 ℃ to the pH=7-8 of slurry (i.e. Phenolphthalein does not turn red), and becomes an ultrafine calcium carbonate emulsion containing a surface treatment agent. After dehydration, flash drying, crushing and packaging, 0.71 tons of finished product ultrafine active calcium carbonate is obtained. After analysis, the product has reached the first-class standard of industrial superfine active calcium carbonate HG/T2776-96.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US9902652B2 (en) | 2014-04-23 | 2018-02-27 | Calera Corporation | Methods and systems for utilizing carbide lime or slag |
| US11377363B2 (en) | 2020-06-30 | 2022-07-05 | Arelac, Inc. | Methods and systems for forming vaterite from calcined limestone using electric kiln |
| US11577965B2 (en) | 2020-02-25 | 2023-02-14 | Arelac, Inc. | Methods and systems for treatment of lime to form vaterite |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2293059C2 (en) * | 2004-04-30 | 2007-02-10 | Алексей Гаврилович Мешандин | Method of production of ultra-dispersed calcium carbonate |
| CN100341786C (en) * | 2006-06-08 | 2007-10-10 | 上海东升新材料有限公司 | Monodispersion cubic light calcium carbonate and its preparation method and application |
| CN101914311B (en) * | 2010-07-30 | 2012-12-26 | 浙江常山金雄有限公司 | Calcium carbonate surface modifying method |
| CN108069451B (en) * | 2016-11-17 | 2020-02-07 | 厦门大学 | Method for preparing ultrafine amorphous calcium carbonate in alcohol-water mixed system |
| CN107603278A (en) * | 2017-08-31 | 2018-01-19 | 贺州钟山县双文碳酸钙新材料有限公司 | A kind of paper grade (stock) modified calcium carbonate and its processing technology |
| CN108239357B (en) * | 2018-02-26 | 2020-08-04 | 湖南爱康新型建材有限公司 | Preparation method of EVA modified calcium carbonate toughening system electrical casing |
| CN108384142B (en) * | 2018-02-26 | 2020-07-07 | 湖南爱康新型建材有限公司 | EVA modified calcium carbonate toughening system electrical casing |
| CN111559752A (en) * | 2020-05-20 | 2020-08-21 | 建德市双超钙业有限公司 | Production method of nano calcium carbonate for PE direct film blowing |
| CN112408449B (en) * | 2020-11-27 | 2023-03-28 | 广西华纳新材料股份有限公司 | Preparation method of monodisperse precipitated calcium carbonate |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US9902652B2 (en) | 2014-04-23 | 2018-02-27 | Calera Corporation | Methods and systems for utilizing carbide lime or slag |
| US11577965B2 (en) | 2020-02-25 | 2023-02-14 | Arelac, Inc. | Methods and systems for treatment of lime to form vaterite |
| US12077447B2 (en) | 2020-02-25 | 2024-09-03 | Arelac, Inc. | Methods and systems for treatment of lime to form vaterite |
| US12172904B2 (en) | 2020-02-25 | 2024-12-24 | Arelac, Inc. | Methods and systems for treatment of lime to form vaterite |
| US12522511B2 (en) | 2020-02-25 | 2026-01-13 | Arelac, Inc. | Methods and systems for treatment of limestone to form vaterite |
| US11377363B2 (en) | 2020-06-30 | 2022-07-05 | Arelac, Inc. | Methods and systems for forming vaterite from calcined limestone using electric kiln |
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