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A technology of zinc sulfate and zinc sulfate solution, applied in the direction of zinc sulfate, etc., can solve the problems of excessive zinc powder and high cost, and achieve the effect of rapid response, low cost and obvious impurity removal effect
Active Publication Date: 2020-01-07
江西省愚人纳米科技有限公司
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Problems solved by technology
In order to prevent the introduction of other impurities such as copper and antimony, excessive zinc powder is required and the cost is high
Method used
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Embodiment 1
[0025] S1. The zinc source reacts with sulfuric acid to form a crude zinc sulfate solution, which is filtered and preliminarily removed to detect the content of lead and nickel;
[0026] S2. The temperature of the zinc sulfate solution was raised to 60° C., and a mixed solution of sodium thiocarbamate and thiourea with a nickel content of 15 times was added by weight ratio, stirred for 1.5 hours, and filtered to obtain a refined zinc sulfate solution.
[0027] Wherein the mixed solution of sodium thiourea and sodium thiourea is, by weight, sodium thiourea: the ratio of water is 1: 1: 2.
Embodiment 2
[0029] S1. The zinc source reacts with sulfuric acid to form a crude zinc sulfate solution, which is filtered and preliminarily removed to detect the content of lead and nickel;
[0030] S2. The temperature of the zinc sulfate solution was raised to 65° C., and a mixed solution of sodium thiocarbamate and thiourea with a nickel content of 15 times was added by weight ratio, stirred for 1 hour, and filtered to obtain a refined zinc sulfate solution.
[0031] Wherein the mixed solution of sodium thiourea and sodium thiourea is, by weight, sodium thiourea: the ratio of water is 1: 1: 4.
Embodiment 3
[0033] S1. The zinc source reacts with sulfuric acid to form a crude zinc sulfate solution, which is filtered and preliminarily removed to detect the content of lead and nickel;
[0034] S2. Heat the zinc sulfate solution to 65° C., add a mixed solution of sodium thiocarbamate and thiourea with a nickel content of 12 times by weight, stir for 1.5 hours, and filter to obtain a refined zinc sulfate solution.
[0035] Wherein the mixed solution of sodium thiourea and sodium thiourea is, by weight, sodium thiourea: the ratio of water is 1: 1: 2.
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Abstract
The invention provides a zinc sulfate impurity removal method. The method comprises the following specific steps: S1, reacting a zinc source with sulfuric acid to generate a crude zinc sulfate solution, filtering, preliminarily removing impurities, and detecting the contents of lead and nickel; s2, heating the zinc sulfate solution, adding a mixed solution of sodium dimethyl dithiocarbamate and thiourea, stirring and filtering to obtain a refined zinc sulfate solution, wherein the mixed solution of sodium dimethyl dithiocarbamate and thiourea is specifically prepared from sodium dimethyl dithiocarbamate, thiourea and water in a weight ratio of 1: (1-3): (2-5); wherein the addition amount of the mixed solution is 10-15 times of the nickel content. By utilizing the synergistic effect of sodium dimethyl dithiocarbamate and thiourea, lead and nickel in zinc sulfate can be removed at the same time, the process is simple, the cost of added reagents is low, industrial operation is easy, and the practical value is high.
Description
technical field [0001] The invention relates to the field of zinc sulfate impurity removal, in particular to a zinc sulfate impurity removal method. Background technique [0002] Zinc sulfate heptahydrate is a kind of chemical substance. Its common name is 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 and sulfuric acid react to produce zinc sulfate, and the formed zinc sulfate solution often contains iron, manganese, lead, nickel, cadmium and other magazines. Generally speaking, impurities such as iron and manganese are easy to remove, but lead, nickel, cadmium, etc. are not easy to remove, which affects 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, replacing them with zinc powder, but it is easy to produce anti-dissolution. [0003] The prior art "...
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