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Copper sulfate de-ironing process

A technology of copper sulfate and copper sulfate solution, which is applied in the iron removal process of copper sulfate and the deep iron removal field of industrial copper sulfate, which can solve the problems of high equipment investment cost, poor iron removal effect, and large copper loss rate, and achieve production The effect of low equipment requirements, low copper loss rate and low energy consumption

Active Publication Date: 2013-01-30
GUANGZHOU SOLDERWELL ADVANCED MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The above methods have their own characteristics, but still have the following disadvantages: 1) High temperature treatment is required, high energy consumption, high equipment investment cost; 2) The process is complicated, the iron removal effect is poor, and the copper loss rate is large

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0044] (1) Make a nearly saturated solution of industrial copper sulfate and distilled water, and filter to remove insoluble impurities. The copper content of the obtained solution is 78g / L, and the iron content is 12mg / L, which is recorded as "solution 1";

[0045] (2) Add sodium hypochlorite (oxidant) to solution 1 in an amount of 1.5g / L, stir, and leave to oxidize for 6 hours to obtain solution 2;

[0046](3) Slowly drop the mixed solution of sodium hydroxide and sodium phosphate (precipitant) into solution 2, the concentration and dosage of which are 2% and 30ml / L respectively, adjust the pH value of the solution to 3.7, hydrolyze at 30°C for 12h, filter , to obtain solution 3;

[0047] (4) Evaporate and crystallize solution 3 to obtain high-purity copper sulfate.

[0048] The iron content of the filtrate obtained by this method is 0.8mg / L, the copper loss rate is 5%, and the purity of copper sulfate is more than or equal to 99%.

Embodiment 2

[0050] (1) Make a nearly saturated solution of industrial copper sulfate and distilled water, and filter to remove insoluble impurities. The copper content of the obtained solution is 80g / L, and the iron content is 14mg / L, which is recorded as "solution 1";

[0051] (2) Add sodium chlorate (oxidant) to solution 1 in an amount of 2.5g / L, stir, and leave to oxidize for 12 hours to obtain solution 2;

[0052] (3) Slowly drop a mixed solution of sodium phosphate and sodium stearate (precipitant) into solution 2, the concentration and dosage of which are 5% and 8ml / L respectively, adjust the pH value of the solution to 3.0, and hydrolyze at 25°C for 24 hours, Filter to obtain solution 3;

[0053] (4) Evaporate and crystallize solution 3 to obtain high-purity copper sulfate.

[0054] The iron content of the filtrate obtained by this method is 0.4mg / L, the copper loss rate is 9%, and the purity of copper sulfate is more than or equal to 99%.

Embodiment 3

[0056] (1) Make a nearly saturated solution of industrial copper sulfate and distilled water, and filter to remove insoluble impurities. The copper content of the obtained solution is 70g / L, and the iron content is 11mg / L, which is recorded as "solution 1";

[0057] (2) Add potassium persulfate (oxidant) to solution 1 in an amount of 0.025g / L, stir, and leave to oxidize for 8 hours to obtain solution 2;

[0058] (3) Slowly drop sodium phosphate solution (precipitant) into solution 2, the concentration and dosage of which are 1% and 80ml / L respectively, adjust the pH value of the solution to 4.0, hydrolyze at 50°C for 3 hours, and filter to obtain solution 3;

[0059] (4) Evaporate and crystallize solution 3 to obtain high-purity copper sulfate.

[0060] The iron content of the filtrate obtained by this method is 0.5mg / L, the copper loss rate is 8%, and the purity of copper sulfate is more than or equal to 99%.

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Abstract

The invention provides a copper sulfate de-ironing process, which comprises the following steps that copper sulfate and distilled water are prepared into solution, insoluble impurities are removed through filtering, a certain number of oxidants are added, precipitants are slowly dropped after the full oxidation, the pH value of the solution is regulated to 3.0 to 4.0, the full hydrolysis is carried out at a certain temperature, and finally, the filtering is carried out. The depth de-ironing effect of controlling the iron content to be smaller than 1ppm and the copper loss rate to be smaller than 10 percent is reached by the method. In addition, the process has the advantages that the cost is low, the process is simple, sediments can be recovered and utilized, and the like.

Description

technical field [0001] The invention relates to a process for removing impurities of soluble copper salts, in particular to a process for removing iron by copper sulfate, and is especially suitable for deep iron removal of industrial copper sulfate. Background technique [0002] Copper sulfate is an important chemical raw material, widely used in industry and agriculture. Copper sulfate can be divided into industrial copper sulfate, feed grade copper sulfate, electroplating grade copper sulfate and chemical reagent copper sulfate. Feed grade copper sulfate, electroplating grade copper sulfate and chemical reagent copper sulfate have high purity and less impurity content, but the price is more expensive; although the price of industrial grade copper sulfate is low, the purity is low and the impurities are more, which limits its use. Therefore, removing impurities in industrial copper sulfate, especially iron impurities, to prepare high-purity copper sulfate is an effective m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G3/10
Inventor 黄耀林叶富华陈明汉杜昆
Owner GUANGZHOU SOLDERWELL ADVANCED MATERIALS
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