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Methods of removing F and Cl in secondary zinc oxide dust effectively and producing electrolytic zinc

A sub-zinc oxide and soot technology, which is applied to the improvement of process efficiency, photographic technology, instruments, etc., can solve the problems of difficulty in stripping zinc cathode, anode corrosion, poor removal effect of sub-zinc oxide, etc.

Inactive Publication Date: 2010-02-17
HUNAN RES INST FOR NONFERROUS METALS
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

Each process has its own advantages, disadvantages and limitations, and the removal effect on secondary zinc oxide with high F and Cl content is poor
If it is used in the production of electric zinc, Cl will cause anode corrosion, causing the cathode zinc and lead to exceed the standard; F will make it difficult to strip the cathode zinc

Method used

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  • Methods of removing F and Cl in secondary zinc oxide dust effectively and producing electrolytic zinc
  • Methods of removing F and Cl in secondary zinc oxide dust effectively and producing electrolytic zinc

Examples

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Embodiment

[0037] For secondary zinc oxide raw materials (Zn44.27%, Pb17.45, Cu0.12%, Cd0.21%, As1.18, Sb0.39%, Ni0.001%, Co0. 001%, F0.3%, Cl0.25%) carried out acidification and granulation rotary kiln roasting to strengthen the de-F, Cl, purification, electrolytic production of zinc research, the specific implementation steps are as follows:

[0038] 1) Acidification granulation: adding 15% Zn-containing soot to sub-zinc oxide soot 2+ : 45~50g / l, H 2 SO 4 : 140~160g / l waste electrolyte, granulated by a disc granulator, and the particle size is controlled to be 8~15mm;

[0039] 2) Rotary kiln roasting of pellets: temperature 650-800°C, time 1.5-2.5h, feeding speed 90g / min, kiln speed 1.2r / min.

[0040] 3) Leaching: control conditions: temperature 85-90°C, L / S=4-4.5:1, first pH control 3-3.5, leaching time 4.0h, pulp filtration to obtain leaching slag and leachate.

[0041] 4) Detection of As, Sb, and F contents in the leachate. The leaching solution is first added with FeSO which i...

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Abstract

The invention provides a method of removing F and Cl in secondary zinc oxide dust effectively. The method comprises the following steps: adding dilute sulphuric acid solution in secondary zinc oxide dust to acidize, granulating, roasting to remove F and Cl effectively, using sintered powder for neutral leaching while controlling the pH of the end point to 3-3.5, detecting the end point contents ofAs, Sb and F in the obtained leaching solution, adding FeSO4-7H2O in the leaching solution, then adding hydrogen peroxide to perform oxidation and neutralization and remove As and Sb and finally adding lime milk to ensure that no Fe<2+>, As, Sb or F is detected in end point detection. The invention also provides a method of producing electrolytic zinc with secondary zinc oxide dust. The method comprises the following steps: treating secondary zinc oxide dust with the above method, removing Cu, Cd, Ni, Co and other impurities by the traditional method and electrodepositing to obtain the electrolytic zinc. In the methods of the invention, the removal rate of F and Cl can reach 96%-98% which is increased by 10-20 percentage points compared with the traditional process so as to increase the quality of fresh electrolyte and improve the quality of electrolytic zinc and the electrolytic operation environment.

Description

technical field [0001] The invention relates to a method for efficiently removing F and Cl from sub-zinc oxide soot produced by zinc smelting and lead smelting, and also relates to a method for producing electric zinc by utilizing sub-zinc oxide soot. Background technique [0002] At present, sub-zinc oxide soot produced by zinc smelting and lead smelting systems has become one of the important raw materials for hydrometallurgy of zinc. The process principle of the sub-zinc oxide soot wet zinc smelting process is: fire or wet defluoridation and chlorine-neutral leaching-acid leaching-purification-electrodeposition; the sub-zinc oxide soot is removed by multi-hearth furnace roasting or alkali washing F, after Cl, carry out neutral leaching, then carry out acid leaching on the leaching slag, return the acidic leaching solution to neutral leaching, and recover Pb and Ag from the acid leaching slag; first add zinc powder to the neutral leaching solution to remove Cu and Cd; then...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B1/02C22B3/08C25C1/16
CPCY02P10/20
Inventor 吴海国刘景槐张德芳李婕宾智勇姚金江谭爱华
Owner HUNAN RES INST FOR NONFERROUS METALS
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