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Production method for producing cement and sulfuric acid from phosphogypsum
The invention discloses a production method for producing cement and sulfuric acid by using phosphogypsum. The method comprises the following steps: carrying out pretreatment purification on phosphogypsum to reduce insoluble phosphorus, water-soluble phosphorus impurities and most free water in the phosphogypsum, kneading with a reducing agent, granulating, and directly feeding the material into a reductive decomposition integrated rotary kiln with fluidization preheating function; controlling a gas phase atmosphere to perform step-by-step heating, drying, dehydration and reductive decomposition under the combustion of the pulverized coal; sulfur dioxide gas generated after reductive decomposition is used for producing sulfuric acid after being subjected to dust removal and purification; and the reduced and decomposed material enters an oxidation calcining kiln for cement clinker sintering, and the gas-phase atmosphere is controlled under the combustion of pulverized coal for heating, mineralizing and sintering to obtain the cement clinker. Compared with the prior art, the production method for producing cement and co-producing sulfuric acid by using phosphogypsum has the advantages that the coal consumption for reduction and firing is reduced, the production efficiency and the product quality are improved, the device investment is saved, the economic benefit of producers is increased, and the environmental protection problem of phosphogypsum stacking treatment is eliminated.
本发明公开了一种磷石膏生产水泥联产硫酸的生产方法，该方法将磷石膏经过预处理净化降低其中的不溶磷、水溶磷杂质和大部分游离水，与还原剂进行捏合造粒后的物料直接送入带有流态化预热功能的还原分解一体化转窑中，在煤粉燃烧下控制气相气氛进行分步加热、干燥、脱水、还原分解；还原分解后产生的二氧化硫气体经过除尘净化后用于生产硫酸；还原分解后的物料进入水泥熟料烧成的氧化煅烧窑中，在煤粉燃烧下控制气相气氛进行加热矿化烧成水泥熟料。与现有的技术相比，本发明保护的磷石膏生产水泥联产硫酸的生产方法，降低了还原与烧成的煤耗，提高了生产效率和产品质量，节约了装置投资，增加了生产者的经济效益，消除了磷石膏堆放处理的环保难题。
Production method for producing cement and sulfuric acid from phosphogypsum
The invention discloses a production method for producing cement and sulfuric acid by using phosphogypsum. The method comprises the following steps: carrying out pretreatment purification on phosphogypsum to reduce insoluble phosphorus, water-soluble phosphorus impurities and most free water in the phosphogypsum, kneading with a reducing agent, granulating, and directly feeding the material into a reductive decomposition integrated rotary kiln with fluidization preheating function; controlling a gas phase atmosphere to perform step-by-step heating, drying, dehydration and reductive decomposition under the combustion of the pulverized coal; sulfur dioxide gas generated after reductive decomposition is used for producing sulfuric acid after being subjected to dust removal and purification; and the reduced and decomposed material enters an oxidation calcining kiln for cement clinker sintering, and the gas-phase atmosphere is controlled under the combustion of pulverized coal for heating, mineralizing and sintering to obtain the cement clinker. Compared with the prior art, the production method for producing cement and co-producing sulfuric acid by using phosphogypsum has the advantages that the coal consumption for reduction and firing is reduced, the production efficiency and the product quality are improved, the device investment is saved, the economic benefit of producers is increased, and the environmental protection problem of phosphogypsum stacking treatment is eliminated.
本发明公开了一种磷石膏生产水泥联产硫酸的生产方法，该方法将磷石膏经过预处理净化降低其中的不溶磷、水溶磷杂质和大部分游离水，与还原剂进行捏合造粒后的物料直接送入带有流态化预热功能的还原分解一体化转窑中，在煤粉燃烧下控制气相气氛进行分步加热、干燥、脱水、还原分解；还原分解后产生的二氧化硫气体经过除尘净化后用于生产硫酸；还原分解后的物料进入水泥熟料烧成的氧化煅烧窑中，在煤粉燃烧下控制气相气氛进行加热矿化烧成水泥熟料。与现有的技术相比，本发明保护的磷石膏生产水泥联产硫酸的生产方法，降低了还原与烧成的煤耗，提高了生产效率和产品质量，节约了装置投资，增加了生产者的经济效益，消除了磷石膏堆放处理的环保难题。
Production method for producing cement and sulfuric acid from phosphogypsum
一种磷石膏生产水泥联产硫酸的生产方法
GONG JIAZHU (author)
2021-04-23
Patent
Electronic Resource
Chinese
PRODUCTION METHOD FOR PRODUCING CEMENT AND CO-PRODUCING SULFURIC ACID FROM PHOSPHOGYPSUM
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Technology improvement of production of sulfuric acid integrated with cement from phosphogypsum
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