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A kind of preparation method of active zinc oxide

A technology of active zinc oxide and zinc concentration, applied in the direction of zinc oxide/zinc hydroxide, etc., can solve the problem of low primary recovery rate of zinc, and achieve the effect of shortening reaction time, ensuring stability and high recovery rate

Active Publication Date: 2020-11-10
GUANGZHOU KECHENG ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] What the present invention is to solve is the technical problem that the primary recovery rate of zinc in the precursor in the existing oxidation preparation method is not high, by controlling the feeding sequence and the specific concentration of the feed liquid in the preparation process of the basic zinc carbonate precursor, the basic carbonic acid Enhanced Primary Recovery of Zinc from Zinc Precursors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of active zinc oxide, comprising the steps of:

[0028] S1. Prepare zinc-containing solution;

[0029] S2. prepare the mixed alkali solution of strong alkali and weak alkali;

[0030] S3. Heating the mixed alkali solution in S2, adding the zinc-containing solution in S1, keeping the pH of the reaction system constant, reacting for 20 minutes, discharging and washing to obtain a basic zinc carbonate precursor, and roasting to obtain an active zinc oxide product. The roasting temperature is 500°C, the calcination time is 3h.

[0031] Wherein in embodiment 1, strong base and weak base are sodium hydroxide and sodium carbonate respectively.

Embodiment 2

[0032] The step of S1 in Example 2 is: using zinc-containing flue ash as a raw material, according to the conventional zinc-containing flue ash removal method, acid leaching, oxidation, and impurity removal are performed to obtain a purified zinc-containing solution. The strong and weak bases are sodium hydroxide and sodium carbonate, respectively.

Embodiment 3

[0033] Strong base and weak base in embodiment 3 are potassium hydroxide and salt of wormwood respectively.

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Abstract

The invention discloses a preparation method of activated zinc oxide. The preparation method comprises the following steps: S1, preparing a zinc-containing solution; S2, preparing a mixed alkali solution of strong base and weak base; S3, heating the mixed alkali solution and adding the zinc-containing solution; discharging and washing after reacting to obtain an alkaline zinc carbonate precursor and roasting to obtain an activated zinc oxide product. The invention provides the preparation method of the activated zinc oxide; the prepared zinc oxide product has good stability; the purity of thezinc oxide reaches 98.5 to 99.5 percent and the specific surface area reaches 43 to 53m<2> / g; one-time recovery rate of zinc in the preparation of the alkaline zinc carbonate precursor is high and reaches 99 percent or above; in addition, the activated precursor zinc carbonate which is fully crushed and obtained by one-step reaction, disclosed by the invention, has the advantages of simple production process and simple and environment-friendly reuse; the produced wastewater does not contain ammonia nitrogen.

Description

technical field [0001] The invention relates to the technical field of zinc oxide preparation, more specifically, to a preparation method of active zinc oxide. Background technique [0002] At present, the preparation methods of zinc oxide mainly include ammonium salt-basic zinc carbonate precursor method, zinc hydroxide precursor method and solid phase method, among which the ammonium salt-basic zinc carbonate precursor method is a common method for preparing zinc oxide. The precursor of ammonium salt-basic zinc carbonate is usually leaching zinc by reacting with ammonia water, ammonium carbonate or ammonium bicarbonate and zinc-containing raw materials, and obtaining a purified zinc-ammonia complex solution by removing impurities, and then distilling ammonia to obtain basic carbonic acid The zinc precursor is finally dried and calcined to obtain zinc oxide products. The main problems of this method are high roasting temperature, high cost of ammonia nitrogen-containing was...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G9/03
CPCC01G9/03C01P2006/12C01P2006/80
Inventor 黄智源叶成伟王皓王永成
Owner GUANGZHOU KECHENG ENVIRONMENTAL PROTECTION TECH