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Preparation method of high-purity zinc oxide

A zinc oxide, high-purity technology, applied in the direction of zinc oxide/zinc hydroxide, etc., can solve the problems of large energy consumption and cumbersome process

Inactive Publication Date: 2017-06-16
河北长力环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the commonly used zinc oxide preparation methods include wet method. The wet method is mostly through immersion to leach impurities and other metal raw materials in the raw material, and then press-filters to obtain zinc ingots with a zinc content of more than 95 wt%, and then calcined in a blast furnace to produce zinc oxide. In the process of ingot calcination to prepare zinc oxide, the zinc ingot should be crushed and ball-milled first, and then calcined, which is not only cumbersome but also consumes a lot of energy

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0026] The invention provides a method for preparing high-purity zinc oxide. Firstly, a slurry of zinc-containing raw materials is provided; the raw materials include zinc and iron, and the mass percentage of zinc in the raw materials is limited to not less than 5 wt% The particle size is 100-150 mesh; then, the slurry is neutrally leached with an acidic solution, and a neutral leachate is obtained after solid-liquid separation, and the obtained neutral leachate is subjected to iron removal and solid-liquid separation to obtain a treatment liquid; The treatment solution is subjected to a zinc precipitation reaction to obtain a zinc-containing precipitate, and the zinc-containing precipitate is calcined to obtain high-purity zinc oxide. .

[0027] The invention provides raw materials with a particle size of 100-150 meshes, realizes the separation of leachate and filter residue through the mixing of acidic solutions, and has low requirements on the content of zinc in the raw mat...

Embodiment 1

[0066] (1) Using ironmaking blast furnace gas slime with a zinc mass percentage of 5% as raw material, the gas slime is ball-milled by a wet ball mill to obtain a slurry with a moisture content of 25 wt% and a particle size of 200 mesh.

[0067] (2) Mix the obtained slurry with the sulfuric acid solution with an initial concentration of 110g / L according to the solid-to-liquid ratio of the gas mud in the slurry to the solution of 3.5:1, and control the temperature at 70°C for neutral leaching; continuous leaching for 4 hours Finally, the measured pH value was 5.4, and the neutral leaching was completed, and the underflow filter press was used for separation by pressure filtration to obtain a neutral leachate and a neutral leach filter residue, and the zinc content in the neutral leachate was determined to be 250g / L.

[0068] (3) Pump the neutral leaching solution to the iron removal tank, measure the concentration of iron ions in the leaching solution, according to the concentra...

Embodiment 2

[0074] (1) Using ironmaking blast furnace gas slime with a zinc mass percent content of 5% as raw material, the gas slime is ball-milled by a wet ball mill to obtain a slurry with a moisture content of 20 wt% and a particle size of 150 mesh.

[0075] (2) Mix the obtained slurry with the sulfuric acid solution with an initial concentration of 90g / L according to the solid-to-liquid ratio of gas mud and solution in the slurry at 4:1, and control the temperature at 65°C for neutral leaching; continuous leaching for 4 hours Afterwards, the measured pH value was 4.8, and the neutral leaching was completed, and the underflow filter press was used for pressure filtration and separation to obtain a neutral leachate and a neutral leach filter residue, and the zinc content in the neutral leachate was determined to be 200g / L.

[0076] (3) Pump the neutral leaching solution to the iron removal tank, measure the concentration of iron ions in the leaching solution, according to the concentrat...

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Abstract

The invention provides a preparation method of high-purity zinc oxide. The preparation method comprises the following steps: firstly, providing slurry of zinc-containing raw materials, wherein the raw materials comprise zinc and iron; the content of the zinc is limited to be not lower than 5 weight percent, and particle sizes of the raw materials are 100 to 150 meshes; neutrally leaching the slurry by adopting an acid solution, and carrying out solid-liquid separation to obtain a neutral leaching liquid; carrying out iron removal on the neutral leaching liquid and solid-liquid separation in sequence to obtain a treatment liquid, then carrying out zinc depositing reaction and calcining to obtain zinc-contained precipitation and obtaining the high-purity zinc oxide. According to the preparation method provided by the invention, the raw materials of which particle sizes are 100 to 150 meshes are provided; separation of the leaching liquid and filter residues is realized by mixing the acid solution; in the raw materials, the mass percentage of the zinc is not lower than 5 percent; by combining an iron removal step, sufficient removal of impurities in obtained precipitation is guaranteed, and the influence of iron on zinc precipitation in the zinc depositing process is further avoided; sufficient removal of the iron is realized by the steps, and the precipitation subjected to precalcined treatment is directly calcined to obtain the high-purity zinc oxide without crushing or ball milling.

Description

technical field [0001] The invention belongs to the technical field of metal oxides, in particular to a preparation method of high-purity zinc oxide. Background technique [0002] Zinc oxide (ZnO), commonly known as zinc white, is an oxide of zinc, which is insoluble in water but soluble in acid and strong alkali. Zinc oxide is widely used in the field of ceramic product preparation due to its advantages of low expansion coefficient, large specific surface area, strong covering ability and low iron content. Ceramic products prepared with high-purity zinc oxide have small color difference, high smoothness and It has good high thermal vibration and mechanical vibration effect. [0003] At present, the commonly used zinc oxide preparation methods include wet method. The wet method is mostly through immersion to leach impurities and other metal raw materials in the raw material, and then press-filters to obtain zinc ingots with a zinc content of more than 95 wt%, and then calci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02
CPCC01G9/02C01P2006/80
Inventor 李国强
Owner 河北长力环保科技有限公司
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