Method for effectively removing magnesium ions in zinc sulfate solution of electrolytic zinc

A technology of zinc zinc sulfate, magnesium ion, applied in the direction of zinc sulfate, improvement of process efficiency, magnesium halide, etc., can solve the problems of difficulty in solid-liquid separation, increased loss of zinc and fluorine, easy clogging of filter cloth and filter screen, etc. The effect of simple magnesium process, reducing zinc content and improving fluorine utilization rate

Active Publication Date: 2019-04-09
张华
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The present invention aims at the magnesium fluoride precipitation magnesium removal method, because the colloidal substance of magnesium fluoride is very easy to block the filter cloth and filter screen, resulting in difficulty in solid-liquid separation, and because the magnesium fluoride precipitation will wrap zinc fluoride, and then Increase the key problems such as the loss of zinc and fluorine, provide a method that is easy to filter and separate, reduce the loss of zinc and fluorine, and then open up the process path, so that it can be applied in actual industrial production and give full play to its practicability, advanced nature, and economic benefits. Effective method for removing magnesium ions in electrolytic zinc zinc sulfate solution

Method used

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  • Method for effectively removing magnesium ions in zinc sulfate solution of electrolytic zinc
  • Method for effectively removing magnesium ions in zinc sulfate solution of electrolytic zinc

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Embodiment 1

[0038] In the zinc sulfate liquid of present embodiment 1, Mg 27.71 g / L, Zn 146.22 g / L, F11.6mg / L.

[0039] A method for effectively removing magnesium ions in an electrolytic zinc-zinc sulfate solution is characterized in that it comprises the following steps:

[0040] A) Magnesium fluoride precipitation, the magnesium precipitation fluoride is completed in the device with the patent number 201710215324.0 previously applied by the applicant, such as figure 1 , figure 2 As shown, the structure of the device includes: a cylinder 4 communicated with the reaction tank 1, the inner wall of the reaction tank 1 is provided with an ultrasonic shock plate 101 connected to the ultrasonic generator, the cylinder 4 is provided with a cavity, and the cylinder 4 is provided with The inlet and outlet connected to the cavity are connected to the reaction tank 1 through the feed pipe 2, the pump 3, and the discharge pipe 5 respectively. The cylinder 4 is provided with a stirring shaft 7 wit...

Embodiment 2

[0052] In the zinc sulfate liquid of present embodiment 2, Mg 21.89 g / L, Zn 148.41 g / L, F12.54mg / L.

[0053] A method for effectively removing magnesium ions in an electrolytic zinc-zinc sulfate solution is characterized in that it comprises the following steps:

[0054] A) magnesium fluoride precipitation, the magnesium precipitation fluoride is completed in the device with the patent number 201710215324.0 previously applied by the applicant, and the device is as in Example 1;

[0055] Utilize this device to carry out magnesium fluoride precipitation specifically as follows:

[0056] A1) In the zinc sulfate liquid in the reaction tank 1, add hydrofluoric acid according to the mass ratio of Mg: HF = 24: 38, and add alkaline zinc-containing materials at the same time until the pH of the zinc sulfate liquid is 5.2, so that the alkaline containing The zinc in the zinc material and the magnesium ion in the zinc sulfate solution undergo a displacement reaction to generate a magnes...

Embodiment 3

[0066] In the zinc sulfate liquid of present embodiment 3, Mg 29.43 g / L, Zn 152.70 g / L, F16.06mg / L.

[0067] A method for effectively removing magnesium ions in an electrolytic zinc-zinc sulfate solution is characterized in that it comprises the following steps:

[0068] A) Magnesium fluoride precipitation, the magnesium precipitation fluoride is completed in the device with the patent number 201710215324.0 previously applied by the applicant, and the structure of the device is as in Example 1;

[0069] Utilize this device to carry out magnesium fluoride precipitation specifically as follows:

[0070] A1) In the zinc sulfate liquid in the reaction tank 1, according to the mass ratio of Mg: HF = 24: 36, add hydrofluoric acid, and add alkaline zinc-containing materials at the same time until the pH of the zinc sulfate liquid is 4, so that the alkaline containing The zinc in the zinc material and the magnesium ion in the zinc sulfate solution undergo a displacement reaction to gen...

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Abstract

The invention provides a method for effectively removing magnesium ions from a zinc sulfate solution of electrolytic zinc. The method comprises the following steps: adding hydrofluoric acid in the zinc sulfate solution for producing electrolytic zinc according to a mass ratio of Mg to HF being 24:(35-38), adding an alkaline zinc-containing material until the pH value of the zinc sulfate solution is 3-5.2, and performing fluorination precipitation to remove magnesium; introducing saturated vapor at the pressure of 0.1-0.6Mpa, or heating to 110-160 DEG C, and boosting to 0.1-0.6Mpa, and insulating for 2-6 hours to condense, agglomerate and grow the magnesium fluoride precipitate in the mixture into particles by heating and pressurizing; decompressing, cooling and separating to obtain magnesium fluoride particles which cannot block a filter cloth or filter screen in the separating process. The method can solve the problem that magnesium fluoride precipitate which is a colloidal substanceblocks a filter cloth or filter screen and cannot realize solid-liquid separation and enables zinc fluoride to break coating of the magnesium fluoride, so that zinc loss can be reduced, and cost can be reduced.

Description

technical field [0001] The invention relates to a method for effectively removing magnesium ions in an electrolytic zinc zinc sulfate solution, and belongs to the technical field of electrolytic zinc production. Background technique [0002] Zinc hydrometallurgy mostly adopts electrolysis of zinc sulfate + sulfuric acid system, commonly known as electrolytic zinc. During the long-term electrolytic zinc production process, the magnesium ions in the zinc sulfate solution will continue to accumulate, and the concentration will continue to increase, resulting in Mg +2 The concentration is as high as 30g / L or more, resulting in magnesium sulfate crystals in the electrolytic zinc system, seriously affecting the normal operation of production, increasing electrolytic power consumption, and increasing the amount of purified zinc powder. Therefore, it is necessary to remove magnesium ions in the zinc sulfate solution. In the existing industrial production of electrolytic zinc, ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/06C01F5/28C01B7/19C22B19/20C22B3/44
CPCC01B7/191C01F5/28C01G9/06C22B19/26Y02P10/20
Inventor 张华
Owner 张华
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