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Process for co-producing sulphuric acid and cement by using gypsum

A kind of process and gypsum technology, applied in cement production, sulfur compounds, inorganic chemistry, etc., can solve the problems of sulfuric acid system blockage, increase production cost, large energy consumption, etc., and achieve the effect of improving quality

Active Publication Date: 2010-09-15
CHONGQING SANSHENG IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] A kind of technology that gypsum prepares sulfuric acid co-production cement, makes according to the following steps:

[0071] 1. Weighing ingredients: Weigh each raw material according to the following proportions, 87% of anhydrite, 4.5% of sandstone, 3% of shale, 0.5% of iron powder and 5% of coke;

[0072] 2. Grinding: Mix the above-mentioned anhydrite, sandstone, shale and iron powder, and grind together with a roller mill until the particle size is 0.08mm sieve, 15%, 0.2mm sieve, 1.2%; in addition, the Above-mentioned coke is pulverized with air separation hammer crusher until particle size is 0.2mm and 13% is sieved, and then stored separately;

[0073] 3. Secondary weighing ingredients: mix and weigh the above-mentioned pulverized anhydrite, sandstone, shale, iron powder mixture and coke according to the C / SO3 molar ratio of 0.63;

[0074] 4. Homogenize and store the raw materials prepared above; put them into the rotary kiln for calcination at normal temperatur...

Embodiment 2

[0076] A kind of technology that gypsum prepares sulfuric acid co-production cement, makes according to the following steps:

[0077] 1. Weighing ingredients: Weigh each raw material according to the following proportions, 88% of anhydrite, 3.0% of sandstone, 4.0% of shale, 1.0% of iron oxide and 4.0% of coke;

[0078] 2. Grinding: Mix the above-mentioned anhydrite, sandstone, shale and iron powder, and grind together with a ball mill to a particle size of 0.08mm sieve to 18%, 0.2mm sieve to 1.0%; in addition, the above-mentioned coke with Grinding by air separation hammer crusher until the particle size is 0.2mm and 18% of the sieve, calculated by weight percentage, and then stored separately;

[0079] 3. Secondary weighing ingredients: mix and weigh the above-mentioned anhydrite, sandstone, shale, iron powder mixture and coke according to the C / SO3 molar ratio of 0.60;

[0080] 4. Homogenize and store the raw materials prepared above; put them into the rotary kiln for calci...

Embodiment 3～10

[0081] Embodiment 3~10: Carry out according to following material, process parameter and step, other are all identical with embodiment 1; In the technology of gypsum preparation sulfuric acid co-production cement, its power consumption significantly reduces, produces one ton of sulfuric acid with technology of the present invention , the coke raw material consumption is 80-100kg.

[0082] implement

[0083] implement

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PUM

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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 a sulphuric 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 co-production cement from gypsum, in particular to a method for preparing raw materials 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 rich, especially anhydrite (the main component is CaSO 4 ) reserve ranks first in the world, and it is a potential raw material for sulfuric acid production. The preparation of sulfuric acid co-production cement with coke and other auxiliary materials will be the only way for the sulfuric acid industry, and there will be great development. [0003] The traditional production process of preparing sulfuric acid co-production cement from gypsum is to grind anhydrite, carbon-containing reducing agent-coke and other auxiliary materials (such as silicon raw mat...

Claims

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Application Information

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IPC IPC(8): C01B17/74C04B7/24
CPCY02P40/10
Inventor 潘先文杨兴志丁竑广
Owner CHONGQING SANSHENG IND CO LTD
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