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Process for co-producing sulphuric acid and cement by using gypsum
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A sulfuric acid and cement technology, applied in cement production, sulfur compounds, inorganic chemistry, etc., can solve problems such as blockage of sulfuric acid system, unfavorable rotary kiln calcination, increased production costs, etc., and achieve the effect of improving quality
Active Publication Date: 2011-07-27
CHONGQING SANSHENG IND CO LTD
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Problems solved by technology
However, in practice, it is found that the main defects of this process include: (1) the grinding fineness is too fine, the energy consumption is large, and it is not conducive to the calcination of the rotary kiln; Burned before the reaction, SO 3 The molar ratio to C is 0.75-0.8, so the amount of coke is forced to increase. The price of coke is the most expensive among the raw materials used. The current market price is 1500 yuan / ton, which increases the production cost; Burned, instead of participating in the reduction reaction, producing CO and decomposed SO 2 Produce side reactions, generate sublimated sulfur, cause blockage of sulfuric acid system, and seriously affect production
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Embodiment 1
[0070] A process for preparing gypsum and co-production of cement with sulfuric acid is prepared according to the following steps:
[0071] 1. Weighing ingredients: Weigh the raw materials according to the following proportions, 87% anhydrite, 4.5% sandstone, 3% shale, 0.5% iron powder, and 5% coke;
[0072] 2. Grinding: Mix the above-mentioned anhydrite, sandstone, shale and iron powder, and grind them together with a roller mill to a particle size of 0.08mm with a sieve residue of 15% and a 0.2mm sieve with a residue of 1.2%; in addition, The above-mentioned coke is ground with a winnowing hammer crusher to a particle size of 0.2mm with 13% remaining on the sieve, and then stored separately;
[0073] 3. Secondary weighing ingredients: the above ground anhydrite, sandstone, shale, iron powder mixture and coke are mixed and weighed at a C / SO3 molar ratio of 0.63;
[0074] 4. Homogenize and store the above-mentioned prepared raw meal; put it into a rotary kiln at room temperature for c...
Embodiment 2
[0076] A process for preparing gypsum and co-production of cement with sulfuric acid is prepared according to the following steps:
[0077] 1. Weighing ingredients: weigh the raw materials according to the following proportions, 88% anhydrite, 3.0% sandstone, 4.0% shale, 1.0% iron oxide and 4.0% coke;
[0078] 2. Grinding: Mix the above-mentioned anhydrite, sandstone, shale and iron powder, and grind them together with a ball mill to a particle size of 0.08mm sieve remaining at 18%, 0.2mm sieve remaining at 1.0%; in addition, using the above coke Air separation hammer crusher grinds to a 0.2mm sieve with a particle size of 18%, which is calculated as a percentage by weight, and then stored separately;
[0079] 3. Second weighing ingredients: the above-mentioned ground anhydrite, sandstone, shale, iron powder mixture and coke are mixed and weighed at a C / SO3 molar ratio of 0.60;
[0080] 4. Homogenize and store the above-mentioned prepared raw meal; put it into a rotary kiln at room te...
Embodiment 3～10
[0081] Examples 3-10: According to the following materials, process parameters and steps, the others are the same as in Example 1. In the process of preparing sulfuric acid and cement from gypsum, the power consumption is significantly reduced. The process of the present invention is used to produce one ton of sulfuric acid , Its coke raw material consumption is 80-100kg.
[0082] Implement
[0083] 7
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Abstract
The invention discloses a process for co-producing sulphuric acid and cement by using gypsum. The process is characterized by comprising the step of: grinding raw materials, wherein the raw materials comprise the gypsum, a carbonaceous reducer, a silica raw material and an aluminum raw material; and the step of grinding the raw materials specifically comprises the step of grinding the carbonaceous reducer to make the carbonaceous reducer have a granularity of 0.2mm and screen residues of below 20 weight percent. The process has the advantages of obviously reducing loss caused by easily-burnt coke in the raw materials before the subsequent reduction reaction of the coke for producing the sulphuric acid and the cement, effectively reducing production cost and effectively avoiding reaction between CO generated by burning the coke and SO2 generated by decomposing the coke before the reduction reaction of the coke generating the condensation of sublimed sulfur in a purification system of asulphuric acid device to cause system blockage so as to effectively eliminate potential safety hazard in the production at the same time.
Description
Technical field [0001] The invention relates to a process for preparing sulfuric acid and co-producing cement from gypsum, in particular to a method for preparing raw meal of the process, and belongs to the technical field of chemical industry. Background technique [0002] Sulfuric acid is a basic chemical raw material required by various industries. my country is short of sulfur resources, but gypsum resources are very abundant, especially anhydrite (the main component CaSO 4 ) The reserve ranks first in the world and is a potential raw material for the production of sulfuric acid. In order to meet the increasing demand for sulfuric acid, anhydrite is used as the main material to produce sulfuric acid with coke, especially anhydrite as the main material. The production of coke and other auxiliary materials for co-production of cement with sulfuric acid will be the only way for the sulfuric acid industry and will have great development. [0003] The traditional production process ...
Claims
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Application Information
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