CN1296305C - Cement clinker using carbide slag as raw material and drying production process thereby - Google Patents

Abstract

The invention provides a cement clinker using calcium carbide slag as a raw material. According to weight percentage, it is made of 60-70% calcium carbide slag, 3-8% phosphorous slag, 1-3% sulfur iron slag, 1-4% phosphogypsum, 8-17% fly ash and 8-10% anthracite coal. The invention also provides a unique production method of cement clinker using carbide slag as raw material. That is, the planetary wheel mill is used to stir to achieve the effect of grinding, extrusion and homogenization, and the dry method of extrusion, dehydration, and ball formation is integrated, with low manufacturing cost, low energy consumption, high production efficiency, and good quality.

Description

Cement clinker using carbide slag as raw material and its dry production method

Technical field:

The invention relates to cement clinker and its production method, in particular to cement clinker using carbide slag as raw material and its dry production method.

Background technique:

Acetylene is one of the important chemical raw materials. Currently produced acetylene is mainly generated by the reaction of calcium carbide _CaC2 with water. In this way, a large amount of calcium carbide slag Ca(OH) ₂ is produced while producing acetylene. The production of cement as cement calcium raw material is the main method of processing calcium carbide slag. In the past, cement plants using carbide slag as raw material mostly adopted the traditional wet kiln production process. In the original traditional wet process, calcium carbide slag is used instead of limestone for batching. This process can completely use carbide slag as limestone raw material, and consumes the most carbide slag. Due to the poor fluidity of calcium carbide slag slurry, the comprehensive moisture of raw slurry is higher, which is about 15% higher than that of ordinary raw slurry, which leads to many problems in the firing system such as high energy consumption, generally at 7560KJ /Kg of clinker; equipment corrosion is serious, the output of the system is low, due to the high moisture content of the slurry, the system consumes a large amount of energy on the evaporation of water, and the output of the system is reduced by about 20%. Another production process is to mix calcium carbide slag, clay, iron powder, and anthracite in a large pool, and then remove about 40% of the water through a filter press, then remove 40% of the water through a dryer, and then enter the rotary kiln at the kiln head at 1450 ° C. The cement clinker is obtained by calcining for 20-30 minutes. Before the raw materials enter the rotary kiln, it is necessary to use machinery to crush the raw materials into cakes, which occupies a large area, requires a large investment, high energy consumption, and low production efficiency.

Invention content:

The object of the present invention is to overcome the above disadvantages and provide a cement clinker with low manufacturing cost, low energy consumption and good quality, which uses carbide slag as raw material. Another object of the present invention is to provide a dry method for producing cement clinker with high production efficiency and using carbide slag as raw material.

The purpose of the present invention is achieved like this:

The present invention uses calcium carbide slag as the cement clinker of raw material, it is characterized in that the weight percent is made of following raw materials:

Carbide slag 60～70%,

Phosphorus slag 3～7%,

Iron pyrite slag 1～3%,

Phosphogypsum 1～4%,

Fly ash 8～17%,

Anthracite 8～10%,

Dry production method of the present invention, comprises the steps:

1), ingredients in proportion;

2) Carbide slag is dehydrated to reduce the moisture to about 35%, and other raw materials are ground into powder by ball mill;

3) Put the dehydrated calcium carbide slag and other raw materials that are ball-milled into powder into the planetary wheel mill mixer and stir to form a slurry evenly.

4), the uniformly stirred slurry is extruded and dehydrated into dry balls, and the water content is less than 5%;

5) Put the extruded and dehydrated material balls into the shaft kiln of the cement machine, and calcinate at 1300°C-1350°C for 5-15 minutes to produce cement clinker.

According to the above-mentioned production method, the water content of the balls entering the kiln is less than 5%, the particle size of the balls is 5-15mm, and the particle size and fineness of the balls are 80 μm, and the sieve residue is less than 5%.

The calcium carbide slag in the raw material of the present invention is the waste material produced by the "acetylene method" used to produce polyvinyl chloride, the phosphorus slag is the waste material produced from yellow phosphorus, the phosphogypsum is the waste material produced from ammonium phosphate, and the fly ash is the waste slag discharged from thermal power plants. These waste materials are used to produce cement clinker, calcium carbide slag replaces limestone, phosphogypsum and phosphorus slag are used as mineralization activators and quick-burning agents, which can reduce the firing temperature (can be reduced by 100-150 ° C), and phosphorus slag can also act as To the role of cement crystal billet, fly ash replaces clay to adjust the composition of silicon-aluminum raw materials. Turn waste into treasure and purify the environment.

Secondary dehydration method is adopted in the method of the present invention, the first time is that the dehydration moisture on the surface of calcium carbide slag can be reduced to 35～40%), and after the mechanical activation of other raw materials through planetary wheel milling mixer through ball milling, calcium carbide slag The chemical bonds in the slag are destroyed, so that the internal moisture is stirred to the surface, and its inert components become active components, and the active components are greatly increased, and then extruded and dehydrated into dry balls, the moisture content is less than 5%, and the specific surface area is greatly increased. The increase can reach about 5000m ² /g, and the raw materials are calcined in the shaft kiln of the cement machine, and calcined at 1300-1350°C for 5-15 minutes to become cement clinker. The high-quality cement clinker produced by the present invention is mixed with various waste slag mixed materials in proportion to produce ordinary Portland cement, slag Portland cement, composite Portland cement, fly ash Portland cement, phosphorus slag Portland cement.

The present invention uses calcium carbide slag instead of limestone to calcinate cement clinker, which fundamentally solves the environmental pollution caused by calcium carbide slag, and does not use ball mills to grind limestone, which saves a lot of power consumption and lowers the clinker firing temperature. For a factory with a scale of 10,000 tons of cement, it can reduce power consumption by 6.7 million degrees per year, save about 3.8 million yuan of funds, save 2,000 tons of coal per year, and save 800,000 yuan of funds. The cement clinker produced by the present invention can produce 500,000 tons For cement, 100,000 tons of cement clinker can be used less, 3 million degrees of electricity can be saved, 17,000 tons of coal can be saved, and about 8.5 million yuan of funds can be saved. The production method of the invention is simple, the equipment investment is small, the occupied area is small, and the production efficiency is high.

Detailed ways:

Example 1:

Embodiment 1 of the present invention cement clinker is made by following raw material by weight percentage:

Carbide slag 70%,

Phosphorus slag 5%,

Iron pyrite slag 3%,

Phosphogypsum 2%,

Fly Ash 10%,

Anthracite 10%.

The dry production method of present embodiment 1 cement clinker comprises the steps:

1. Prepare raw materials in proportion according to clinker saturation coefficient KH=0.96±0.02, silicic acid rate m=2.0±0.2, aluminum oxygen rate P=1.4±0.02;

2. Use a plate and frame press to dehydrate calcium carbide slag by 35%, and use a ball mill to grind other raw materials;

3. Put the above calcium carbide slag and other raw materials into the planetary wheel mill mixer and stir evenly to form a slurry;

4. Extrude and dehydrate the above slurry into dry pellets. The moisture content of the dry pellets into the kiln is 5%, the particle size of the pellets is 5-15mm, and the fineness of the pellets is 80μm, and the sieve balance is less than 2%;

5. Send the material balls into the shaft kiln of the cement machine and calcinate at a high temperature of about 1350°C for 10 minutes to burn the cement clinker. The resulting Portland cement clinker has a 28-day flexural strength of 7.5MPa and a compressive strength of over 52.5MPa.

Example 2:

Embodiment 2 of the present invention cement clinker is made by following raw material by weight percentage:

Carbide slag 65%,

Phosphorus slag 8%,

Iron pyrite slag 3%,

Phosphogypsum 2%,

Fly Ash 13%,

Anthracite 9%.

The dry production method of the cement clinker of the present embodiment 2 is basically the same as the production method of the cement clinker of the embodiment. The difference is that the ingredients are mixed according to the saturation coefficient KH=0.96±0.02, n=2.0±0.2, P=1.4±0.02, and the calcination time is 5 to 10 minutes. The 28-day flexural strength of the Portland cement clinker produced is 8.0 Above MPa, the compressive strength is above 52.5MPa.

Example 3:

Embodiment 3 of the present invention cement clinker is made by following raw material by weight percentage:

Carbide slag 60%,

Phosphorus slag 6%,

Iron pyrite slag 3%,

Phosphogypsum 4%,

Fly Ash 17%,

Anthracite 10%.

The dry production method of the present embodiment 3 cement clinker is the same as that of embodiment 1. The 28-day flexural strength of the produced Portland cement is above 7MPa, and the compressive strength is above 50MPa.

Cement raw material composition is as table 1 in above-mentioned each embodiment:

Table 1: Composition analysis of cement raw materials made from carbide slag name SiO ₂ Al ₂ O _{3 Fe2O3 _} CaO MgO SO ₃ NNN Carbide slag 1.49 1.77 0.13 61.01 0.21 17.0 Phosphorus slag 33.06 8.62 2.27 44.21 1.14 2.96 Pyrite slag 4.98 4.14 63.14 9.55 4.41 2.80 Phosphogypsum 0.67 0.38 0.23 36.16 0.18 49.81 8.25

Anthracite Industry Analysis:

A＝28.24 V＝11.11 M＝1.28 Q＝21730

The chemical composition of the cement clinker produced by the above method is shown in Table 2, and the physical property analysis is shown in Table 3.

Table 2 Analysis table of chemical composition of cement clinker NNN SiO ₂ Al ₂ O _{3 Fe2O3 _} CaO MgO SO ₃ ∑ K H N p 0.62 20.7 5.62 3.89 66.84 0.89 1.02 98.96 0.969 2.18 1.44

Table 3 clinker physical performance analysis table Fineness specific surface area consistency Initial setting (min) final setting (min) Flexural strength (MPa) Compressive strength number (MPa) 3d 28d 3d 28d 2.2 385 25.80 86 151 5.5 7.8 28.8 54.6

Table 4 is a comparison table of strengths of different types of cement produced by using the cement clinker of the present invention.

Table 4 produces the strength comparison table of different kinds of cement: Variety Clinker Mixed material plaster Fineness Initial setting (min) final setting (min) Flexural strength Flexural compression 3d 28d 3d 28d General water 83 13 4 2.1 162 235 4.5 7.8 21.3 45.6 composite cement 51 45 4 1.8 175 375 2.5 6.9 12.7 36.4 Phosphorus slag cement 66 30 4 3.1 141 191 4.0 7.5 18.2 44.1 Slag cement 66 30 4 1.2 186 363 4.1 8.1 21.2 48.9 fly ash cement 66 30 4 1.9 173 252 3.4 7.4 16.7 41.4

The above-mentioned embodiments are to further illustrate the above-mentioned content of the present invention, but it should not be understood that the scope of the above-mentioned subject of the present invention is limited to the above-mentioned embodiments. All technologies implemented based on the above content belong to the scope of the present invention.

Claims (3)

1, be the cement clinker of raw material with carbide slag, it is characterized in that making by following raw materials according by weight percentage:

Carbide slag 60～70%,

Phosphorus slag 3～8%,

Pyrite cinder 1～3%,

Phosphogypsum 1～4%,

Flyash 8～17%,

Hard coal 8～10%,

2, as claimed in claim 1 is the dry method production process of the cement clinker of raw material with carbide slag, it is characterized in that comprising the steps:

1), prepares burden in proportion;

2), the carbide slag dehydration, other raw material becomes powder through the ball mill ball milling;

3), ground other raw material of carbide slag and ball that will dewater drops into the form slurry that stirs in the planetary rolling stirrer;

4), the slurry that stirs is become the siccative ball through extrusion dehydration;

5), the siccative ball that extrusion dehydration is formed drops in the cement equipment shaft kiln, calcines 5～15 minutes under 1300 ℃～1350 ℃ conditions, promptly produces cement clinker.

3, as claimed in claim 2 is the dry method production process of the cement clinker of raw material with carbide slag, it is characterized in that pellet goes into kiln moisture＜5%, and the pellet particle diameter is 5～15mm, and balling-up grain diameter fineness 80 μ m screen over-sizes are less than 5%.