Improved preparation technique for preparing sulphuric acid and cement with gypsum

Abstract

The present invention provides an improved production process of utilizing gypsum to produce sulfuric acid and cement, which relates to the sulfuric acid and cement industry production technology, and the resource comprehensive utilization and environmental protection governing field of the industrial byproduct gypsum. The improved production process is characterized in that natural gypsum with the CaSO4*2H2O as the main composition or the industrial byproduct gypsum is adopted as the main source material; clay, coke and fly ash clinker are used as supplementary materials; the half-water drying gypsum flow, the single stage powder grinding, raw material mixing melting, suspension preheater kiln decomposing calcination, closing diluted acid washing and purification, two-turning and two-suction processes are adopted; the sulfuric acid and cement products are prepared through six steps of source material homogenizing, drying and dehydration, raw material preparation, clinker burning, kiln gas acid production and cement grinding; the improved production process has the advantages of wide range source material, solving the land occupation and environmental pollution problems of the gypsum waste residue, realizing the circulation utilization of sulfur resource, adopting a plurality of new processes and devices, realizing the large scale production easily, advanced technology, mature process, easy operation in production control, low energy consumption, high benefit, no waste water and waste residues exhaust.

Description

technical field [0001] The invention relates to an improved production process for producing sulfuric acid and cement from gypsum, which belongs to the field of comprehensive utilization of sulfuric acid and cement industry production technology and industrial by-product gypsum waste residue resources and environmental protection and treatment. Background technique [0002] The research on gypsum sulfuric acid and cement technology began in the early 20th century. In 1916, Germany's Muller and Kuhne (Muller Kuhne) successfully developed natural gypsum to produce sulfuric acid and cement technology, and established a pilot plant; thereafter, Britain, Germany, Poland, Austria, South Africa, etc. successively built the following Natural gypsum, anhydrite and phosphogypsum are used as raw materials to produce sulfuric acid and cement plant, and put into production. The average daily production capacity of sulfuric acid and cement is 160 tons each. Due to technical and engineeri...

AI Technical Summary

Problems solved by technology

Due to the limitations of the process, the requirements for raw materials are high, the control range of the main process indicators is wide, and the production is difficult to control; the operation of the rotary kiln is unstable, and liquid phase and ring formation are prone to occur, making it difficult to ensure continuous production; the decomposition rate of gypsum is low, SO 2 The concentration is low and the fluctuation is large, which affects the normal operation of the acid production part; the purification efficiency of the kiln gas is low, and acid wastewater is produced; SO 2 The conversion and absorption rate is low, and the tail gas needs to be neutralized by ammonia before it can be discharged up to the standard; the heat consumption is high, the power consumption is large, and the economic benefit is poor; it is difficult to realize large-scale production

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