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Method for producing food-grade copper sulfate by smelting byproduct-copper sulfate

A copper sulfate, food-grade technology, applied in copper sulfate and other directions, can solve the problems of inability to large-scale industrial production, inability to apply to the food hygiene industry, and low product quality, and achieve shortened induction period, stable product quality, and small particles. Effect

Inactive Publication Date: 2013-09-18
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is inefficient and cannot be used in industrial production on a large scale.
[0019] 3. Use the chemical oxidation method to neutralize the traditional iron removal process by hydrolysis purification, and then adjust the pH value of the solution to remove iron ions and other metal ion impurities in the form of hydroxides. The product quality of this method is not high
[0020] The products produced by the above three methods are not suitable for the food hygiene industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A. Add 10 liters of ultra-pure water and 2.5 kg of copper sulfate, a by-product of industrial smelting, into a 20-liter reactor equipped with stirring, a thermometer and a reflux condenser, heat to 70°C and stir to dissolve, slowly add sulfuric acid dropwise to adjust the pH of the solution to 1.20, Slowly add an appropriate amount of oxidant (volume ratio 100:3, 3% hydrogen peroxide) while it is hot to oxidize low-priced metal ions in the solution. The speed of adding the oxidant should be such that no bubbles are generated. Keep warm after adding Stir for 1 hour to obtain the solution of step A;

[0054] B, then slowly add polyferric sulfate and basic copper carbonate precipitation complexing agent mixed by mass ratio 1:3.0, the precipitation complexing agent is 1.5% of the solution weight of A step, after the precipitation complexing agent is added, use basic formula Adjust the pH of the solution to 3.0-4.0 with copper carbonate, slowly add activated carbon as an ads...

Embodiment 2

[0057] A. Add 10 liters of ultra-pure water and 2.5 kg of copper sulfate, a by-product of industrial smelting, into a 20-liter reactor equipped with a stirring, thermometer and reflux condenser, heat to 80°C and stir to dissolve, slowly add sulfuric acid dropwise to adjust the pH of the solution to 1.50, Slowly add an appropriate amount of oxidant (volume ratio 100:3, 3% hydrogen peroxide) while it is hot to oxidize low-priced metal ions in the solution. The speed of adding the oxidant should be such that no bubbles are generated. Keep warm after adding Stir for 1 hour to obtain the solution of step A.

[0058] B, then slowly add polyferric sulfate and basic copper carbonate precipitation complexing agent mixed by mass ratio 1:5.0, the precipitation complexing agent is 2.5% of the solution weight of A step, after the precipitation complexing agent is added, use basic formula Adjust the pH of the solution to 3.0-4.0 with copper carbonate, and slowly add activated carbon as an a...

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Abstract

The invention discloses a method for producing food-grade copper sulfate by a smelting byproduct-copper sulfate. The method comprises the following steps of: dissolving the industrial smelting byproduct-copper sulfate in ultrapure water, heating to 70-80 DEG C, slowly dropwise adding acid for adjusting the pH value of a solution to be 1.00, stirring for dissolving, and slowly adding an oxidant; mixing polymeric ferric sulfate and basic cupric carbonate according to a mass ratio of 1:(2.0-5.0) to prepare a deposition complexing agent, slowly adding the deposition complexing agent which is 0.6-2.8% of the weight of the solution into the insulation solution, using basic cupric carbonate to adjust the pH value of the solution to be 3.0-4.0, slowly adding an adsorbing agent which is 1.0-2.5% of the weight of the solution, stirring and insulating for 6-8 hours, cooling to room temperature, and standing for a day; and carrying out vacuum filtration on the solution, filtering by using a microporous filter membrane of 0.2-0.3mu m, carrying out ultrasonic-assisted rotary evaporation and concentration on filter liquor for crystallization, and carrying out spray-drying to obtain the food-grade copper sulfate.

Description

technical field [0001] The invention relates to a production method of food-grade copper sulfate, in particular to a method for producing food-grade copper sulfate from copper sulfate, a by-product of smelting. Background technique [0002] Copper sulfate is a sky blue or slightly yellow granular crystal, and its aqueous solution is acidic. It is a protective inorganic fungicide. Chemical formula CuSO 4 , generally the pentahydrate CuSO 4 ·5H 2 O, commonly known as gall alum, blue alum, copper alum; blue orthorhombic crystal, density 2.284 g / cm 3 . Copper sulfate is an important raw material for preparing other copper compounds. It can be mixed with milk of lime to obtain "Bordeaux" solution, which is used as an insecticide. Copper sulfate is also an electrolyte for electrolytic refining of copper. [0003] Function and use of copper sulfate: [0004] (1) In the inorganic industry, it is used to manufacture other copper salts such as cuprous chloride, cupric chloride, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G3/10
Inventor 蔡定建许宝泉舒庆
Owner JIANGXI UNIV OF SCI & TECH
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