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Method for preparing calcium carbonate and co-producing sodium sulfate by using phosphorus gypsum and soda ash

A technology of phosphogypsum and calcium carbonate, applied in the field of comprehensive treatment and utilization of phosphogypsum, can solve the problem of high cost and achieve the effects of small investment, simple production equipment and environmental protection

Inactive Publication Date: 2010-10-06
汪晋强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Calcium carbonate is generally prepared from quicklime and calcium hydroxide, and its cost is high

Method used

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  • Method for preparing calcium carbonate and co-producing sodium sulfate by using phosphorus gypsum and soda ash
  • Method for preparing calcium carbonate and co-producing sodium sulfate by using phosphorus gypsum and soda ash

Examples

Experimental program
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Effect test

Embodiment 1

[0022] A kind of method that utilizes phosphogypsum and soda ash to prepare calcium carbonate to co-produce sodium sulfate, first convert the amount of the pure substance calcium sulfate contained in the industrial phosphogypsum product, the phosphogypsum containing 400kg calcium sulfate and the soda ash that dissolves are mixed according to calcium sulfate The ratio with the mass of sodium carbonate pure substance is 1: 0.58 in the reactor (1) that drops into, carries out chemical reaction under slow stirring; Then reaction product is suction-filtered in suction filter (2), obtains clarified sodium sulfate Solution and calcium carbonate filter cake; After the calcium carbonate filter cake of gained is washed with water, centrifugal through centrifuge (3), solid-liquid separation, solid is dried through drier (4), pulverizes through first pulverizer (5) again, Obtain calcium carbonate (6) product 218.87kg; Sodium sulfate solution is sent into underpressure distiller (7) and car...

Embodiment 2

[0024] A kind of method that utilizes phosphogypsum and soda ash to prepare calcium carbonate to co-produce sodium sulfate, first convert the amount of the pure substance calcium sulfate contained in the industrial phosphogypsum product, the phosphogypsum containing 500kg calcium sulfate and the soda ash dissolved are calculated according to the amount of calcium sulfate The ratio with the mass of sodium carbonate pure substance is 1: 0.78 drops in the reactor (1), carries out chemical reaction under slow stirring; Then reaction product is suction-filtered in suction filter (2), obtains clarified sodium sulfate Solution and calcium carbonate filter cake; After the calcium carbonate filter cake of gained is washed with water, centrifugal through centrifuge (3), solid-liquid separation, solid is dried through drier (4), pulverized through first pulverizer (5) again, Obtain calcium carbonate (6) product 367.92kg; Sodium sulfate solution is sent into underpressure distiller (7) and...

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Abstract

The invention discloses a method for preparing calcium carbonate and co-producing sodium sulfate by using phosphorus gypsum and soda ash. The method comprises the following steps of: (1) calculating pure calcium sulfate substance content of a phosphorus gypsum product, feeding the phosphorus gypsum and sodium carbonate solution into a reactor in a mass ratio of pure substances of the calcium sulfate and the sodium carbonate of 1: 0.58-0.78, and performing chemical reaction with slow stirring; (2) filtering a reaction product obtained in the step (1) in a filter to obtain clear sodium sulfate solution and calcium carbonate filter cakes; (3) washing the calcium carbonate filter cakes obtained in the step (2) by using water, centrifuging the solution through a centrifuge, separating solid and liquid, drying the solid through a dryer, and crushing the solid through a first crusher to obtain a calcium carbonate product; and (4) conveying the sodium sulfate solution obtained in the step (2) into a reduced pressure distiller to perform reduced pressure distillation, then cooling a reduced pressure distillation product in a cooler, and crushing the reduced pressure distillation product in a second crusher to obtain a powdery sodium sulfate product.

Description

Technical field [0001] The present invention relates to the technical field of comprehensive management and utilization of phosphogypsum. Specifically, it relates to a method for preparing calcium carbonate and co-producing sodium sulfate by using phosphogypsum and soda ash. Background technique [0002] Phosphogypsum is a solid industrial waste discharged during the production of wet phosphoric acid. To produce 1 ton of phosphoric acid (in P 2 O 5 (calculated) can produce 4.5-5 tons of phosphogypsum. With the rapid development of phosphate fertilizer and high-concentration phosphoric acid industry, the discharge of phosphogypsum waste residue is increasing day by day. In 2008, the world's annual emissions of phosphogypsum reached 280 million tons, and my country's annual emissions exceeded 50 million tons, accounting for more than 70% of industrial by-product gypsum. The calcium sulfate content in phosphogypsum exceeds 90% and is an important recycled gypsum resource. Es...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/10C01F11/18
Inventor 王嘉兴
Owner 汪晋强
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