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Method for producing micron-grade zinc oxide with high fluorine and chlorine crude zinc oxide as raw material

A technology of high fluorine, chlorine and zinc oxide, which is applied in the direction of zinc oxide/zinc hydroxide, etc., can solve the problem of high production conditions and achieve the effect of loose process conditions, easy operation and low consumption

Inactive Publication Date: 2015-12-09
HUNAN HUAXIN RAREANDPRECIOUS METALS TECH CO LTD
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Problems solved by technology

However, this method requires the operation of defluorination and chlorine removal, and has high requirements on production conditions.

Method used

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Experimental program
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Embodiment Construction

[0018] The present invention will be described in detail below with specific embodiments.

[0019] (1) The raw material is high-fluorine chlorine suboxide zinc oxide powder produced by blast furnace iron dust through rotary kiln fuming, and the composition is (%): Zn43.0, Fe3.7, C14.0, F0.8, Pb6. 5. In0.12; use ammonia water and ammonium carbonate as the leaching solvent, put 4t of high-fluorine chlorine suboxide zinc powder in a liquid-solid ratio of 4:1m 3 Dissolve in 4t of ammonium carbonate and 2.3 cubic meters of ammonia water at / t (L / kg), dilute with water until the liquid is 10 cubic meters, leaching with electromagnetic stirring for 3 hours, control the reaction temperature at 80°C, and the end point pH4.7; the main reaction of this step The formula is as follows:

[0020] ZnO+2NH 4 + +2NH 3 =Zn(NH 3 ) 4 2+ +H 2 O;

[0021] (2) After the reaction, liquid-solid separation was carried out to obtain a total of 24 cubic meters of leachate and washing water; the w...

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Abstract

The invention relates to a method for producing micron-grade zinc oxide with high fluorine and chlorine crude zinc oxide as a raw material. The method comprises the process: carrying out wet-metallurgy ammonium salt-ammonia water leaching, oxidizing to remove iron, adding a zinc powder and ammonium sulfide and removing impurities, and neutralizing to prepare zinc hydroxide; and then carrying out 1200 DEG C high-temperature calcination in a dry calcining furnace, and thus preparing the micron-grade zinc oxide with the purity of 99.95%. The process conditions are loose, the operations are simple and convenient, and impurity removal is efficient, controllable and reliable.

Description

technical field [0001] The invention relates to a method for extracting zinc metal by wet method combined with pyrometallurgy, in particular to a method for producing micron-sized zinc oxide by using high-fluorine chlorine suboxide zinc oxide as a raw material. Background technique [0002] Zinc oxide powder is a kind of secondary resource for the production of metal zinc by treating zinc-containing solid waste (such as iron and steel dust, lead smelting slag, etc.) by high-temperature fuming method to obtain enriched secondary zinc oxide powder. In addition to zinc, its chemical composition also contains high content of other impurities that are very harmful to zinc production by wet method, such as Cl3-10%, F0.2-0.6%, Fe2-8%. The impurity content of this zinc oxide powder is obviously too high, so that it cannot be calcined at a high temperature to produce micron-sized zinc oxide. With the advancement of science and technology, the requirement for the purity of zinc oxide...

Claims

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Application Information

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IPC IPC(8): C01G9/02
CPCC01G9/02C01P2004/61C01P2006/80
Inventor 吴声良商亚军林锡庭曹晓星
Owner HUNAN HUAXIN RAREANDPRECIOUS METALS TECH CO LTD
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