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Method for preparing blue copperas and co-producing calcium hydroxide by using phosphogypsum

A technology of copper sulfate pentahydrate and calcium hydroxide, which is applied in the field of comprehensive treatment and utilization of phosphogypsum, can solve problems such as waste of resources, and achieve the effects of environmental protection, small investment, and simple production equipment

Inactive Publication Date: 2010-09-29
汪晋强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the methods for producing copper sulfate all need to use copper ore, resulting in a huge waste of resources

Method used

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  • Method for preparing blue copperas and co-producing calcium hydroxide by using phosphogypsum
  • Method for preparing blue copperas and co-producing calcium hydroxide by using phosphogypsum

Examples

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Embodiment 1

[0023] A method for preparing copper sulfate pentahydrate and co-producing calcium hydroxide with phosphogypsum, first convert the amount of pure substance calcium sulfate contained in industrial phosphogypsum products, and mix 300kg of calcium sulfate-containing phosphogypsum with diluted copper hydroxide The solution is put into the reactor (1) of 1: 0.52 according to the mass ratio of calcium sulfate and copper hydroxide pure substance, and the chemical reaction is carried out under slow stirring; then the reaction product is suction filtered in the suction filter (2), Obtain clarified copper sulfate pentahydrate solution and calcium hydroxide filter cake; Use a little calcium sulfate and copper hydroxide to remove the residual impurity in the copper sulfate pentahydrate solution of gained respectively, filter, and this moment has removed fluoride, phosphorus compounds, sulfides and other pollutants; the copper sulfate pentahydrate solution is sent to the distiller (3) for s...

Embodiment 2

[0025] A method for preparing copper sulfate pentahydrate and co-producing calcium hydroxide with phosphogypsum, first convert the amount of pure substance calcium sulfate contained in industrial phosphogypsum products, and mix 300kg of calcium sulfate-containing phosphogypsum with diluted copper hydroxide The solution is put into the reactor (1) of 1: 0.72 according to the mass ratio of calcium sulfate and copper hydroxide pure substance, and the chemical reaction is carried out under slow stirring; then the reaction product is suction filtered in the suction filter (2), Obtain clarified copper sulfate pentahydrate solution and calcium hydroxide filter cake; Use a little calcium sulfate and copper hydroxide to remove the residual impurity in the copper sulfate pentahydrate solution of gained respectively, filter, and this moment has removed fluoride, phosphorus compounds, sulfides and other pollutants; the copper sulfate pentahydrate solution is sent to the distiller (3) for s...

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Abstract

The invention discloses a method for preparing blue copperas and co-producing calcium hydroxide by using phosphogypsum. The method comprises the following steps of: (1) converting the amount of a pure substance of calcium sulfate contained in an industrial phosphogypsum product; throwing the phosphogypsum and the solution of copper hydroxide into a reactor; and performing a chemical reaction with slow stirring, wherein the mass ratio of pure substances of the calcium sulfate to the copper hydroxide is 1:0.52-0.92; (2) filtering a reaction product obtained in the step (1) in a filtering machine to obtain clarified solution of blue copperas and a calcium hydroxide filter cake; (3) feeding the clarified solution of the blue copperas obtained in the step (2) into a decompression distiller; distilling the solution of the blue copperas under a reduced pressure until the blue copperas starts separating out; discharging all of the blue copperas into a cooler for cooling to the normal temperature; and crashing the blue copperas by using a first crashing machine so as to obtain a blue copperas product; and (4) after washing the calcium hydroxide filter cake with water, centrifuging by using a centrifuge; performing solid-liquid separation; drying the solid by using a drier; and crashing the dried solid by using a second drier to obtain a calcium hydroxide product.

Description

technical field [0001] The invention relates to the technical field of comprehensive treatment and utilization of phosphogypsum, in particular to a method for preparing copper sulfate pentahydrate and co-producing calcium hydroxide with phosphogypsum. Background technique [0002] Phosphogypsum is a solid industrial waste discharged during the production of wet-process phosphoric acid, and the production of 1 ton of phosphoric acid (in P 2 o 5 Phosphogypsum is a solid industrial waste discharged during the production of wet-process phosphoric acid, and the production of 1 ton of phosphoric acid (in P 2 o 5 Total) 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 discharge of phosphogypsum reached 280 million tons, and our country has exceeded 50 million tons, accounting for more than ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/02C01G3/10
Inventor 王嘉兴
Owner 汪晋强
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