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Zinc sulfate impurity removal method

A technology of zinc sulfate and zinc sulfate solution, applied in the direction of zinc sulfate, etc., can solve the problems of no response to re-dissolution, high cost of Sien filter, increase the amount of zinc powder, etc., and achieve easy factory operation and impurity removal effect. Visible, easy-to-react effects

Inactive Publication Date: 2015-10-28
NINGBO ZHENHAI NEW ORIENTAL FINE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method has the following defects: 1. The cost of using Sean filter is high, and it can be completed with a filter press; 2. There is no treatment for cadmium and nickel remelting, and the amount of zinc powder can only be increased

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Detect the cadmium and nickel contained in the refined zinc sulfate solution to be treated. The determination method of cadmium in zinc sulfate refers to HGT 2326-2005 Determination of cadmium in industrial zinc sulfate; the determination of nickel adopts the analysis method standard GB of nickel-63 in water T 14502-1993 (EDTA titration). The test results are: nickel 200ppm, cadmium 600ppm.

[0022] 2. Preliminary removal of impurities: heat the refined zinc sulfate solution to 80°C, add zinc powder with 10 times the nickel content, as well as antimony trioxide and copper sulfate, so that the concentrations of antimony trioxide and copper sulfate in the solution are 1.2mg respectively / L and 40mg / L, fully stirred, and the nickel content decreased to below 5ppm after 1 hour of reaction.

[0023] 3. Secondary impurity removal: Filter the liquid obtained in the previous step. When the filtrate cools below 50°C, add zinc powder with 3 times the cadmium content to the fi...

Embodiment 2

[0025] 1. The cadmium and nickel contained in the refined zinc sulfate solution to be treated are tested, and the test results are: nickel 100ppm, cadmium 500ppm.

[0026] 2. Preliminary removal of impurities: heat the refined zinc sulfate solution to 80°C, add zinc powder with 8 times the nickel content, as well as antimony trioxide and copper sulfate, so that the concentrations of antimony trioxide and copper sulfate in the solution are 1.2mg respectively / L and 40mg / L, fully stirred, and the nickel content decreased to below 5ppm after 1 hour of reaction.

[0027] 3. Secondary impurity removal: Filter the liquid obtained in the previous step. When the filtrate cools below 50°C, add zinc powder with 2 times the cadmium content to the filtrate, stir well, and continue to react for 1 hour. After testing, the cadmium content Reach below 2ppm.

Embodiment 3

[0029] 1. The cadmium and nickel contained in the refined zinc sulfate solution to be treated are tested, and the test results are: nickel 400ppm, cadmium 800ppm.

[0030] 2. Preliminary removal of impurities: heat the refined zinc sulfate solution to 90°C, add zinc powder with 12 times the nickel content, and antimony trioxide and copper sulfate, so that the concentrations of antimony trioxide and copper sulfate in the solution are 1.5mg respectively / L and 45mg / L, fully stirred, and the nickel content decreased to below 5ppm after 1 hour of reaction.

[0031] 3. Secondary impurity removal: Filter the liquid obtained in the previous step. When the filtrate cools below 50°C, add zinc powder with 3.5 times the cadmium content to the filtrate, stir well, and continue to react for 1 hour. After testing, the cadmium content Reach below 2ppm.

[0032] Through repeated experiments, the processing effect of the inventive method is shown in Table 1. Using the method of the invention...

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PUM

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Abstract

The invention relates to an impurity removal method, and in particular relates to a zinc sulfate impurity removal method. The method comprises the following steps: a, detecting cadmium and nickel which are contained in a refined zinc sulfate solution to be treated; b, carrying out preliminary impurity removal, namely heating the refined zinc sulfate solution to reach 80 DEG C to 90 DEG C, adding zinc powder which is 8 to 12 times greater than the content of the nickel as well as antimony trioxide and copper sulfate to ensure that the concentrations of the antimony trioxide and the copper sulfate in the solution are respectively 1.2mg / L to 1.5mg / L and 40 mg / L to 45mg / L, fully stirring and reacting for 1 to 2 hours; and c, carrying out secondary impurity removal, namely filtering a liquid obtained in the step b, adding the zinc powder which is 2 to 3.5 times greater than the content of the cadmium into filtrate when cooling the filtrate to reach below 50 DEG C, fully stirring and further reacting until reaching a full reaction. The method has the beneficial effects that the reaction is simple and is finished by one step; the impurity removal effect is obvious; in addition, the process is simple and added reagents are low in cost. Thus, the method is easy for factory operation.

Description

technical field [0001] The invention relates to a method for removing impurities, in particular to a method for removing impurities with zinc sulfate. Background technique [0002] Zinc sulfate heptahydrate is a kind of chemical substance. Its common names include zinc alum and gallonite. In the production of zinc sulfate heptahydrate, the quality must be up to standard, and impurity removal is the key. Zinc oxide reacts with sulfuric acid to produce zinc sulfate, and impurities (iron, manganese, nickel, cadmium, etc.) also react with sulfuric acid and must be removed. Generally speaking, impurities such as iron and manganese are easy to remove, while nickel, cadmium, etc. are not easy to remove If it falls off, it will cause zinc sulfate heptahydrate to be greenish (normally white), and it will also affect the product quality. The existing measures are based on the principle that the activity of nickel and cadmium is greater than that of hydrogen and less than that of zinc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G9/06
Inventor 胡正华施为民钱高平
Owner NINGBO ZHENHAI NEW ORIENTAL FINE CHEM CO LTD
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