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A method for preheating and decomposing cement for sulfuric acid co-production from phosphogypsum

A gypsum production and phosphogypsum technology, applied in cement production, chemical instruments and methods, sulfur compounds, etc., can solve the problems of phosphogypsum accumulation and pollution, and achieve the effect of reducing enterprise operation risks, improving utilization rate, and improving decomposition efficiency.

Active Publication Date: 2017-10-20
湖北湖大天沭新能源材料工业研究设计院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to design a method for the preheating decomposition of phosphogypsum to sulfuric acid coproduction cement for sulfuric acid and cement coproduction industry to improve phosphorus Gypsum decomposition efficiency, reduce clinker firing temperature and energy consumption, increase sulfuric acid and cement clinker production, reduce sulfuric acid and cement clinker production costs, accelerate the rapid development of phosphogypsum sulfuric acid co-production cement technology, thereby effectively improving the comprehensive performance of phosphogypsum Utilization rate, completely solve the problem of phosphogypsum accumulation and pollution

Method used

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Effect test

Embodiment 1

[0036] The raw materials are phosphogypsum and auxiliary materials such as cinder, clay, and coke powder, among which the content of phosphogypsum is more than 80%.

[0037]Phosphogypsum and auxiliary raw materials are preheated and decomposed, and the raw materials with a water content of 20% to 25% composed of phosphogypsum, cinder, coke powder and other auxiliary materials are first dried online to make the water content of the material 2% to 3%. Below, the dried material is directly sent to the grinding system for joint grinding modification treatment, and the fine particle content below 65 μm reaches 85%, and the raw material with good homogenization effect is sent to the new multi-stage preheater for multi-stage cycle preheating , the temperature of the phosphogypsum raw meal rises to 850°C-900°C, and the phosphogypsum begins to decompose rapidly to produce CaO and SO 2 , where CaO is sent to the hollow rotary kiln for calcination to form cement clinker, while SO 2 Afte...

Embodiment 2

[0040] The raw materials are phosphogypsum and auxiliary materials such as cinder, clay, and coke powder, among which the content of phosphogypsum is about 85%.

[0041] Phosphogypsum and auxiliary raw materials are preheated and decomposed, and the raw materials with a water content of 22% to 25% composed of phosphogypsum, cinder, coke powder and other auxiliary materials are first dried online to make the water content of the material 2% to 2.5%. Next, the dried materials are directly sent to the grinding system for joint grinding modification treatment, and the fine particle content below 65 μm reaches about 88%, and the raw material with good homogenization effect is sent to the new multi-stage preheater for multi-stage cycle preheating. Heat, the temperature of phosphogypsum raw meal rises to 800℃~900℃, phosphogypsum begins to decompose rapidly to produce CaO and SO 2 , where CaO is sent to the hollow rotary kiln for calcination to form cement clinker, while SO 2 After h...

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Abstract

The invention relates to the technical field of industrial production of sulfuric acid and cement, the field of industrial solid waste comprehensive utilization, and the field of environment protection and treatment, and particularly relates to a pre-heating decomposition method of producing sulfuric acid from phosphogypsum with co-production of cement. The method includes the steps of powder grinding of raw materials, multi-stage cyclic pre-heating, high-effective decomposition and kiln gas separation and purification. The method is used for preparing a cement raw material from the phosphogypsum subjected to pre-heating decomposition with clay, sand rock, coke and such auxiliary materials in the process of producing the sulfuric acid from the phosphogypsum with co-production of the cement. The method solves the problems that a pre-heating decomposition technology in the prior art is low in decomposition ratio of phosphogypsum, is low in productivity of sulfuric acid and clinker, is liable to cause crusting and blocking in a kiln and is high in production energy consumption, can reduce the decomposition efficiency of the phosphogypsum and accelerate escape of SO2, and further increase the productivity of the sulfuric acid and cement clinker. The pre-heating decomposition method of producing the sulfuric acid from the phosphogypsum with co-production of the cement can significantly reduce sintering temperature and energy consumption of the clinker, can reduce production cost of sulfuric and cement clinker, and can further increase comprehensive utilization rate of the phosphogypsum.

Description

technical field [0001] The invention relates to the fields of sulfuric acid, cement industrial production technology, comprehensive utilization of industrial solid waste, and environmental protection and treatment, and specifically relates to a method for preheating and decomposing cement for the co-production of sulfuric acid from phosphogypsum. Background technique [0002] Phosphogypsum is the industrial waste slag discharged during the wet production of phosphoric acid. For every 1 ton of phosphoric acid produced, about 4.5t to 5t of phosphogypsum is produced. According to statistics, in 2012, the accumulation of phosphogypsum in my country reached more than 300 million tons, and the annual discharge of phosphogypsum was close to 50 million tons. my country's phosphate fertilizer production is increasing at a rate of more than 10% per year, which will lead to an increase in the discharge of phosphogypsum year by year. Long-term accumulation of large amounts of phosphogy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/50C01B17/74C04B7/04C04B7/43
CPCY02P40/121
Inventor 田键朱兵兵
Owner 湖北湖大天沭新能源材料工业研究设计院有限公司
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