CN1035758Y - Preparation method of high calcium fused magnesia - Google Patents
Preparation method of high calcium fused magnesiaInfo
- Publication number
- CN1035758Y CN1035758Y CN91106253.X CN1035758Y CN 1035758 Y CN1035758 Y CN 1035758Y CN 1035758 Y CN1035758 Y CN 1035758Y
- Authority
- CN
- China
- Prior art keywords
- powder
- calcium
- fused magnesia
- magnesia
- ball
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 77
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 42
- 229910052791 calcium Inorganic materials 0.000 title claims abstract description 15
- 239000011575 calcium Substances 0.000 title claims abstract description 15
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 title abstract description 8
- 239000000843 powder Substances 0.000 claims abstract description 17
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 16
- 239000000292 calcium oxide Substances 0.000 claims abstract description 11
- 238000003723 Smelting Methods 0.000 claims abstract description 10
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000010891 electric arc Methods 0.000 claims abstract description 8
- 238000004321 preservation Methods 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract 2
- 238000002156 mixing Methods 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 10
- 239000002994 raw material Substances 0.000 abstract description 9
- 230000005611 electricity Effects 0.000 abstract description 2
- 239000007921 spray Substances 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 12
- 235000012255 calcium oxide Nutrition 0.000 description 8
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 7
- 239000000377 silicon dioxide Substances 0.000 description 6
- 235000012239 silicon dioxide Nutrition 0.000 description 6
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 description 5
- 239000001095 magnesium carbonate Substances 0.000 description 5
- 235000014380 magnesium carbonate Nutrition 0.000 description 5
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 5
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 4
- 239000011449 brick Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 241001062472 Stokellia anisodon Species 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
Abstract
高钙电熔镁砂的制备方法，以轻烧氧化镁(苦土)为主要原料并加入适当的氧化钙(均匀地混合)，在不断搅拌下喷洒物料重量15～20%的水，用成球机将喷过水的物料制成直径30～60毫米的料球，将料球与粉料分层交替投入电弧炉中，通电熔融，保温冷却后，即得高钙电熔镁砂。熔炼时也可不加粉料。本发明工艺简单，容易操作，节省能源和电极(吨产品耗电2800千瓦小时，耗电极仅45千克)，熔炼周期仅为7小时，成本低，经济效益高。The preparation method of high-calcium fused magnesia, takes lightly burned magnesia (bitter earth) as the main raw material and adds appropriate calcium oxide (evenly mixed), and sprays 15-20% of the weight of the material under constant stirring. The ball machine makes the material sprayed with water into the material ball with a diameter of 30-60 mm, and the material ball and the powder material are alternately put into the electric arc furnace, energized and melted, and after heat preservation and cooling, the high calcium fused magnesia is obtained. It is also possible not to add powder during smelting. The process of the invention is simple, easy to operate, saves energy and electrodes (a ton of product consumes 2800 kilowatt hours of electricity, and consumes only 45 kilograms of electrodes), the smelting cycle is only 7 hours, the cost is low, and the economic benefit is high.
Description
本发明是关于用轻烧氧化镁(苦土)和适量的氧化钙(生石灰)为原料制备电熔镁砂的一种方法。The invention relates to a method for preparing fused magnesia by using lightly burned magnesia (bitter earth) and an appropriate amount of calcium oxide (quick lime) as raw materials.
国内外制备电熔镁砂，多数采用以菱镁矿石为原料，在电弧炉中熔炼的方法。少数以卤水为原料制备电熔镁砂，其工艺复杂，设备易腐蚀，成本高，产量不大。该方法与本发明关系不大，故不予详述。以菱镁矿石为原料制备电熔镁砂的工艺过程是，将优质菱镁矿石(氧化镁含量＞46％)破碎成1～4公分的小块，放在电弧炉中分解、熔炼，物料熔融后出炉保温、冷却即得电熔镁砂。该方法的不足之处是，要求使用优质菱镁矿石，原料来源困难，能源及材料消耗高(吨产品耗电3700～3800千瓦/小时，耗石墨电极65千克)，熔炼周期长(12小时/炉)，产品质量档次低，经济效益不好，多数企业处于亏损状态。更重要的是，由于这种产品中氧化钙(CaO)与二氧化硅(SiO2)的克分子比(以下简称钙硅比)一般都小于1，因此用其制造的电熔镁砖荷软点只能在1680～1700℃之间，耐高温性能较差。For the preparation of fused magnesia at home and abroad, most of them use magnesite ore as raw material and smelt in electric arc furnace. Few of them use brine as raw material to prepare fused magnesia, the process is complicated, the equipment is easy to corrode, the cost is high, and the output is not large. This method has little to do with the present invention, so it will not be described in detail. The process of preparing fused magnesia with magnesite ore as raw material is to crush high-quality magnesite ore (magnesium oxide content> 46%) into small pieces of 1 to 4 cm, decompose and smelt in an electric arc furnace, and melt the material. After the furnace is kept for heat preservation and cooling, the fused magnesia is obtained. The disadvantage of this method is that it requires the use of high-quality magnesite ore, the source of raw materials is difficult, the energy and material consumption is high (the power consumption per ton of product is 3700-3800 kW/h, and the consumption of graphite electrodes is 65 kg), and the smelting cycle is long (12 hours/hour). furnace), the product quality is low, the economic benefits are not good, and most enterprises are in a state of loss. More importantly, since the molar ratio of calcium oxide (CaO) to silicon dioxide (SiO2) in this product (hereinafter referred to as calcium-silicon ratio) is generally less than 1, the fused magnesia bricks made with it are charged with soft spots. It can only be between 1680 and 1700 ° C, and the high temperature resistance performance is poor.
本发明的目的是，提供以轻烧氧化镁和适量的氧化钙为原料制备高钙电熔镁砂的一种方法。The purpose of the present invention is to provide a method for preparing high calcium fused magnesia with light-burned magnesia and an appropriate amount of calcium oxide as raw materials.
本发明解决的技术关键是，向轻烧氧化镁中加入适量的氧化钙，以大幅度提高电熔镁砂中的钙硅比，改变岩相结构，从而提高产品的耐高温性能。电熔可采用现行电熔镁砂技术条件，即操作电压80～85伏，操作电流5500～6000安，电极直径200～300毫米，熔炼温度2700～2900℃。The technical key solved by the invention is to add an appropriate amount of calcium oxide to the light-burned magnesia to greatly increase the calcium-silicon ratio in the fused magnesia, change the petrographic structure, and thereby improve the high temperature resistance of the product. The current fused magnesia technical conditions can be used for electrofusion, that is, the operating voltage is 80-85 volts, the operating current is 5500-6000 amperes, the electrode diameter is 200-300 mm, and the melting temperature is 2700-2900 °C.
高钙电熔镁砂的具体制备方法是：一、原料名 称 成份及质量指标轻烧氧化镁 氧化镁(MgO)≥94％氧化钙(CaO)1～1.2％二氧化硅(SiO2)≤0.7％三氧化二铁(Fe2O3)≤0.5％灼 减≤2.5％氧化钙 氧化钙(CaO)＞95％The specific preparation method of high-calcium fused magnesia is: 1. Name of raw material Composition and quality index Light-burned magnesium oxide (MgO) ≥ 94% calcium oxide (CaO) 1～1.2% silicon dioxide (SiO2) ≤ 0.7 % Ferric oxide (Fe2O3) ≤ 0.5% calcination reduction ≤ 2.5% calcium oxide (CaO) > 95%
二、技术配方轻烧氧化镁与氧化钙的重量比为1000∶2～4。2. Technical formula The weight ratio of light-burned magnesia to calcium oxide is 1000:2～4.
三、制备工艺制备工艺由混料、成球、熔炼和保温冷却四道工序组成。3. Preparation process The preparation process consists of four processes: mixing, forming into balls, smelting and heat preservation and cooling.
1、混料按技术配方分别称量轻烧氧化镁和氧化钙，投入混料机中将其搅拌均匀，配成粉料，待成球。1. The mixture is weighed according to the technical formula, respectively, light-burned magnesium oxide and calcium oxide, put into the mixer, stirred evenly, made into powder, and waited to be formed into a ball.
2、成球在不断搅拌条件下，向混合均匀的粉料中均匀地喷洒粉料重量15～20％的水，用制球机将粉料制成直径为30～60毫米的料球，待熔炼。2. Under the condition of continuous stirring, spray 15-20% of the weight of the powder into the uniform powder evenly, and use a ball making machine to make the powder into balls with a diameter of 30-60 mm, which are to be smelted. .
3、熔炼将料球与粉料依次交替分层投入电弧炉中，通电使物料熔融，时间为7小时。3. Melting Put the material balls and powder materials into the electric arc furnace alternately in layers, and electrify the materials to melt for 7 hours.
4、保温冷却将熔炼的高钙电熔镁砂坨吊至电弧炉外，进行保温冷却(一般需要90～100小时)即可得到高钙电熔镁砂。4. Heat preservation and cooling Hang the smelted high-calcium fused magnesia lump out of the electric arc furnace, and carry out heat preservation and cooling (generally 90-100 hours) to obtain high-calcium fused magnesia.
加粉料的目的是，可根据需要更灵活地调整产品中的钙硅比。料球与粉料的重量比以7∶3～4为宜。亦可不加粉料，完全用料球熔炼。The purpose of adding powder is to adjust the calcium-silicon ratio in the product more flexibly as needed. The weight ratio of the material ball to the powder is preferably 7:3 to 4. It can also be smelted completely with pellets without adding powder.
试验结果表明：可用5毫米以下粒状优质菱镁矿石(含氧化镁＞46％)和同样粒度的优质石灰石(含碳酸钙＞95％)代替轻烧氧化镁和氧化钙，直接在电弧炉中分解、熔融制备高钙电熔镁砂。关键是要确保产品的钙硅比及其它规定指标。The test results show that the light-burned magnesia and calcium oxide can be replaced by granular high-quality magnesite ore below 5 mm (containing magnesium oxide > 46%) and high-quality limestone (containing calcium carbonate > 95%) of the same particle size, and decomposed directly in the electric arc furnace. , Melt preparation of high calcium fused magnesia. The key is to ensure the calcium-silicon ratio and other specified indicators of the product.
用本制备工艺生产的高钙电熔镁砂，达到如下技术指标：氧化镁(MgO)≥97％氧化钙(CaO)1.1～1.5％二氧化硅(SiO2)≤0.6％三氧化二铁(Fe2O3)＜0.5％灼 减≤0.25％钙硅比为1.8～2.5用这种高钙电熔镁砂制造的电熔镁砖的荷软点为1750℃，比现有电熔镁砖提高50～80℃。The high calcium fused magnesia produced by this preparation process reaches the following technical indicators: magnesium oxide (MgO) ≥ 97% calcium oxide (CaO) 1.1-1.5% silicon dioxide (SiO2) ≤ 0.6% ferric oxide (Fe2O3 )<0.5% ignition minus ≤0.25% calcium-silicon ratio is 1.8-2.5 The soft point of charge of fused magnesia bricks made of this high calcium fused magnesia is 1750℃, which is 50-80% higher than the existing fused magnesia bricks °C.
高钙电熔镁砂主要原料及能源消耗如下(以吨产品计)轻烧氧化镁 1.8吨/吨产品氧化钙 2～4千克/吨产品电 2800千瓦小时/吨产品电极 45千克/吨产品每炉高钙电熔镁砂的熔炼时间(7小时)比电熔镁砂现行工艺的熔炼时间缩短5个小时。The main raw materials and energy consumption of high calcium fused magnesia are as follows (calculated in tons of product) light-burned magnesia 1.8 tons/ton of product calcium oxide 2-4 kg/ton of product electricity 2800 kWh/ton of product Electrode 45 kg/ton of product The smelting time (7 hours) of the high calcium fused magnesia in the furnace is shortened by 5 hours compared with the smelting time of the current process of the fused magnesia.
本发明的优点是，工艺简单，流程短，容易操作。能源及电极消耗低，熔炼周期短，产品档次高。The advantages of the present invention are that the process is simple, the flow is short, and the operation is easy. Low energy and electrode consumption, short smelting cycle and high product quality.
按说明书第五部分的说明，经混料、成球、熔炼、保温冷却即可实施本发明。According to the description in the fifth part of the specification, the present invention can be implemented after mixing, forming into a ball, smelting, keeping warm and cooling.
Claims (2)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1035758Y true CN1035758Y (en) | 1997-09-03 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4126478A (en) * | 1977-10-17 | 1978-11-21 | Kaiser Aluminum & Chemical Corporation | Production of periclase grain |
| US4721691A (en) * | 1983-10-31 | 1988-01-26 | Shin Nihon Chemical Industry Co., Ltd. | Magnesia clinker and method of producing the same |
| CN1033614A (en) * | 1988-12-16 | 1989-07-05 | 机械工业部沈阳铸造研究所 | Improve the resmelting reductive technique of purity of magnesite |
| CN1049145A (en) * | 1990-09-11 | 1991-02-13 | 营口市电熔镁砖厂 | A kind of preparation method of electrosmelted magnesite clinker |
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4126478A (en) * | 1977-10-17 | 1978-11-21 | Kaiser Aluminum & Chemical Corporation | Production of periclase grain |
| US4721691A (en) * | 1983-10-31 | 1988-01-26 | Shin Nihon Chemical Industry Co., Ltd. | Magnesia clinker and method of producing the same |
| CN1033614A (en) * | 1988-12-16 | 1989-07-05 | 机械工业部沈阳铸造研究所 | Improve the resmelting reductive technique of purity of magnesite |
| CN1049145A (en) * | 1990-09-11 | 1991-02-13 | 营口市电熔镁砖厂 | A kind of preparation method of electrosmelted magnesite clinker |
Non-Patent Citations (1)
| Title |
|---|
| 《耐火材料》 第1期第25卷 1991.1.1 吕洪风"用连续电熔法生产电熔镁砂" * |
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