阅读说明：本技术 一种硫酸锌除杂方法 (Zinc sulfate impurity removal method ) 是由 邓亮群 黄少华 于 2019-11-04 设计创作，主要内容包括：本发明提供一种硫酸锌除杂方法。具体步骤为：S1.锌源与硫酸反应生成粗制硫酸锌溶液,过滤后,初步除杂,检测铅、镍含量；S2.将硫酸锌溶液升温,加入福美钠和硫脲的混合溶液,搅拌过滤,得精制硫酸锌溶液。福美钠和硫脲的混合溶液具体为,按重量比计,福美钠∶硫脲∶水的比例为1∶1～3∶2～5；加入的量为镍含量10～15倍福美钠和硫脲的混合溶液。本发明利用福美钠和硫脲的协同作用,可同时去除硫酸锌中铅、镍,工艺简单,加入的试剂成本较低,易于工厂化操作,实用价值高。(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, primarily removing impurities, and detecting the content of lead and nickel; s2, heating the zinc sulfate solution, adding a mixed solution of sodium ferulate and thiourea, stirring and filtering to obtain a refined zinc sulfate solution. The mixed solution of sodium ferulate and thiourea is specifically that the weight ratio of sodium ferulate to thiourea to water is 1: 1-3: 2-5; the adding amount of the mixed solution is 10-15 times of the nickel content of the sodium dimethyl dithiocarbamate and thiourea. The method utilizes the synergistic effect of the sodium ferbamate and the thiourea, can simultaneously remove lead and nickel in the zinc sulfate, has simple process, lower cost of the added reagent, easy industrial operation and high practical value.)

1. The zinc sulfate impurity removing method is characterized in that an impurity removing agent is a mixed solution of sodium dimethyl dithiocarbamate and thiourea.

2. The impurity removing method for zinc sulfate according to claim 1, wherein the mixed solution of sodium ferulate and thiourea is prepared by mixing sodium ferulate, thiourea and water in a weight ratio of 1: 1-3: 2-5.

3. The impurity removing method for zinc sulfate according to claim 1, wherein the mixed solution of sodium ferulate and thiourea is prepared by mixing sodium ferulate, thiourea and water in a weight ratio of 1: 2.

4. The zinc sulfate impurity removal method according to any one of claims 1 to 3, which is characterized by comprising the following specific steps:

s1, reacting a zinc source with sulfuric acid to generate a crude zinc sulfate solution, filtering, primarily removing impurities, and detecting the content of lead and nickel;

s2, heating the zinc sulfate solution, adding a mixed solution of sodium ferulate and thiourea, stirring and filtering to obtain a refined zinc sulfate solution.

5. The impurity removing method for zinc sulfate according to claim 4, wherein the zinc source is one of zinc hypoxide and zinc oxide.

6. The impurity removing method for zinc sulfate according to claim 4, wherein the termination temperature of the temperature rise in S2 is 20-70 ℃.

7. The method for removing impurities from zinc sulfate according to claim 4, wherein the amount of the mixed solution of sodium dimethyl dithiocarbamate and thiourea added in S2 is 10-15 times of the amount of the mixed solution of sodium dimethyl dithiocarbamate and thiourea in terms of weight ratio.

8. The method for removing impurities from zinc sulfate according to claim 4, wherein the amount of the mixed solution of sodium dimethyl dithiocarbamate and thiourea added in S2 is 12-15 times of the amount of the mixed solution of sodium dimethyl dithiocarbamate and thiourea in terms of weight ratio.

9. The impurity removing method for zinc sulfate according to claim 4, wherein the stirring time is 1-2 hours.

10. The impurity removing method for zinc sulfate according to claim 4, which is characterized by comprising the following specific steps:

s1, reacting a zinc source with sulfuric acid to generate a crude zinc sulfate solution, filtering, primarily removing impurities, and detecting the content of lead and nickel;

s2, heating the zinc sulfate solution to 60 ℃, adding a mixed solution of sodium dimethyl dithiocarbamate and thiourea, the nickel content of which is 15 times that of the mixed solution, stirring for 1.5 hours, and filtering to obtain a refined zinc sulfate solution.

Technical Field

The invention relates to the field of zinc sulfate impurity removal, and particularly relates to a zinc sulfate impurity removal method.

Background

The zinc sulfate heptahydrate is a chemical, commonly known as zinc alum and goslarite, and in the production of the zinc sulfate heptahydrate, the quality is up to the standard, and the key is the removal of impurities. Zinc oxide reacts with sulfuric acid to produce zinc sulfate, and the formed zinc sulfate solution often contains impurities such as iron, manganese, lead, nickel, cadmium and the like. Generally, impurities such as iron and manganese are easy to remove, and lead, nickel, cadmium and the like are difficult to remove, so that the product quality is influenced. The existing measures are based on the principle that the activity of nickel and cadmium is greater than that of hydrogen and is not as good as that of zinc, and zinc powder is used for replacement, but the reverse dissolution is easy to generate.

Disclosure of Invention

The invention aims to provide an impurity removing agent for simultaneously removing lead and nickel in zinc sulfate.

The impurity removing agent is a mixed solution of sodium dimethyl dithiocarbamate and thiourea.

The mixed solution of sodium dimethyl dithiocarbamate and thiourea is characterized in that the ratio of sodium dimethyl dithiocarbamate to thiourea to water is 1: 1-3: 2-5 in terms of weight ratio.

Preferably, the mixed solution of sodium ferulate and thiourea is prepared by mixing sodium ferulate, thiourea and water in a weight ratio of 1: 2.

The invention also aims to provide a zinc sulfate impurity removal method.

In order to achieve the aim, the zinc sulfate impurity removing method provided by the invention comprises the following specific steps:

s1, reacting a zinc source with sulfuric acid to generate a crude zinc sulfate solution, filtering, primarily removing impurities, and detecting the content of lead and nickel;

s2, heating the zinc sulfate solution, adding a mixed solution of sodium ferulate and thiourea, stirring and filtering to obtain a refined zinc sulfate solution.

The zinc source in the S1 is one of zinc hypoxide and zinc oxide;

the termination temperature of the temperature rise in the S2 is 20-70 ℃;

and the amount of the mixed solution of sodium dimethyl dithiocarbamate and thiourea added into the S2 is that the mixed solution of sodium dimethyl dithiocarbamate and thiourea contains 10-15 times of nickel by weight.

Preferably, the amount of the mixed solution of sodium dimethyl dithiocarbamate and thiourea added in S2 is 12-15 times of the nickel content in terms of weight ratio.

Preferably, the first and second electrodes are formed of a metal,

s1, reacting a zinc source with sulfuric acid to generate a crude zinc sulfate solution, filtering, primarily removing impurities, and detecting the content of lead and nickel;

s2, heating the zinc sulfate solution to 60 ℃, adding a mixed solution of sodium dimethyl dithiocarbamate and thiourea, the nickel content of which is 13 times that of the mixed solution, stirring for 1.5 hours, and filtering to obtain a refined zinc sulfate solution.

According to the scheme, the impurities of Fe and Mn in the zinc sulfate solution are removed through primary impurity removal; and raising the temperature of the solution to 40-70 ℃, adding a mixed solution of sodium dimethyl dithiocarbamate and thiourea, and removing Pb and Ni by utilizing the synergistic action of the sodium dimethyl dithiocarbamate and the thiourea.

Sodium ferbamate alone has a removing effect on Ni in zinc sulphate solution, but has no effect on Pb. The single thiourea solution has poor effect on removing Pb and Ni in the zinc sulfate solution. When the two coexist, the two can be used as catalysts of complex reaction to generate synergistic effect, and can simultaneously remove Pb and Ni in the zinc sulfate solution. The sodium ferbamate and thiourea form complex precipitate with Pb and Ni, and can be completely removed by filtration without introducing new impurities.

The invention has the beneficial effects that:

the impurity removal method provided by the invention utilizes the synergistic effect of the mixed solution of the sodium feramete and the thiourea to simultaneously remove Pb and Ni impurities in the zinc sulfate solution, the reaction is rapid, and the impurity removal effect is obvious. In addition, the method has simple process, the added reagent has low cost, and the method is easy for industrial operation.

Detailed Description

In order to more clearly and completely describe the technical scheme of the invention, the invention is further described in detail by the specific embodiments, and it should be understood that the specific embodiments described herein are only used for explaining the invention, and are not used for limiting the invention, and various changes can be made within the scope defined by the claims of the invention.