Method for preparing activated zinc oxide by utilizing high-arsenic secondary zinc oxide resource ammonia-ammonium process

A technology of active zinc oxide and sub-zinc oxide, applied in the direction of zinc oxide/zinc hydroxide, etc., can solve problems such as weakness and lack of technology

Active Publication Date: 2012-07-18
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the patents and technologies related to the production of active zinc oxide from high-arsenic sub-zinc oxide raw materials are relatively lacking and weak. How to effectively use high-arsenic sub-zinc oxide resources with high impurity content and low grade to maximize its economic efficiency will provide market, The industry provides high-quality, low-cost qualified products to become the goal of research and development by relevant technical personnel

Method used

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  • Method for preparing activated zinc oxide by utilizing high-arsenic secondary zinc oxide resource ammonia-ammonium process
  • Method for preparing activated zinc oxide by utilizing high-arsenic secondary zinc oxide resource ammonia-ammonium process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061]First configure ammonia-containing water: ammonium bicarbonate = 2.5:1 (molar ratio), leaching agent 1L with a total molar concentration of free ammonia of 8 mol, weigh 250 g of powdered zinc suboxide soot sample, and liquid-solid ratio = 4:1. React at a temperature of ℃-70℃ for 0.5 hours and then filter, add the washing solution to make the volume of the leaching solution the same as that of the leaching agent, the leaching rate of zinc is 93.5%, the composition of the leaching solution (g / L): Zn 107.68; Pb 0.53; Cu 0.036; Cd 0.35; As 1.67; Sb 0.6. Then the leaching liquid is purified and removed. According to the amount of As and Sb, an appropriate amount of hydrogen peroxide and iron salt are added successively to remove impurities and sulfide is added 0.5h before the end of the reaction for secondary removal of impurities; after filtration, according to Cu, 1.2 to 4 times the theoretical amount of zinc powder required for Pb and Cd is added to the zinc powder, and tw...

Embodiment 2

[0064] Prepare ammonia-containing water first: ammonium bicarbonate = 5:1 (molar ratio), 1L of leaching agent with a total molar concentration of free ammonia of 10mol, weigh 200g of powdered zinc suboxide soot sample, and liquid-solid ratio = 2:1, at 30 React at a temperature of ℃-50℃ for 2.0 hours, then filter, add washing liquid to make the leachate volume equal to that of the leaching agent, zinc leaching rate is 90.3%, leachate composition (g / L): Zn 89.25; Pb 0.16; Cu 0.01; Cd 0.25; As 0.87; Sb 0.25. Impurity removal: 30% H is used at the beginning of impurity removal 2 o 2 Carry out pre-oxidation, then slowly add ferrous salt and H 2 o 2 Perform oxidation adsorption to precipitate impurities such as arsenic and antimony, and add sulfide to separate heavy metal ions 30 minutes before the end of the reaction; during the reaction, H 2 o 2 The addition amount is 1~10ml / L, the addition amount of ferrous salt is 0.5~10g / L, the addition amount of sulfide is 0.5~10g / L, the ...

Embodiment 3

[0067] First configure ammonia-containing water: ammonium bicarbonate = 1:1 (molar ratio), 1L of leaching agent with a total molar concentration of free ammonia of 10mol, weigh 100g of powdered zinc suboxide soot sample, and liquid-solid ratio = 10:1. React at a temperature of ℃-85℃ for 4.0 hours, then filter, add the washing liquid to make the volume of the leachate the same as that of the leaching agent, the zinc leaching rate is 92.1%, the composition of the leachate (g / L): Zn 49.25; Pb 0.09; Cu 0.02; Cd 0.11; As 0.35; Sb 0.12. Then the leaching liquid is purified and removed. According to the amount of As and Sb, an appropriate amount of hydrogen peroxide and iron salt are added successively to remove impurities and sulfide is added 0.5h before the end of the reaction for secondary removal of impurities; after filtration, according to Cu, Add zinc powder 20 to 30 times the theoretical amount of zinc powder required for Pb and Cd, and carry out two countercurrent purificati...

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Abstract

The invention relates to a method for preparing activated zinc oxide by utilizing a high-arsenic secondary zinc oxide resource ammonia-ammonium process, which belongs to the field of inorganic chemical industry and secondary resource recovery. The method comprises the following technical processes in sequence as follows: leaching, purifying, ammonia distillation, washing, dry crushing, calcining and the like. According to the method for preparing the activated zinc oxide by utilizing the high-arsenic secondary zinc oxide resource ammonia-ammonium process, by taking high-arsenic-antimony secondary zinc oxide generated in a lead and zinc smelting process as a raw material, selective leaching is performed by adding ammonia water and ammonium bicarbonate; then, two-stage purification and deeppurification are performed by ferrous salt, hydrogen peroxide, sulfide and zinc powder; and the ammonia water is recycled and valued metal waste residues are comprehensively recovered. The method forpreparing the activated zinc oxide by utilizing the high-arsenic secondary zinc oxide resource ammonia-ammonium process has strong adaptability on zinc-contained materials and is capable of treating various complicated zinc-contained resources. The method for preparing the activated zinc oxide by utilizing the high-arsenic secondary zinc oxide resource ammonia-ammonium process has the advantages of short flow, production process closed cycle, convenience in operation, low energy consumption, excellent product quality, high economic benefits, low pollution, high comprehensive recovery capacityand the like, and is suitable for industrial production and popularization.

Description

technical field [0001] The invention relates to a method for preparing active zinc oxide by utilizing the high-arsenic sub-zinc oxide resource ammonia-ammonium process, which belongs to the field of inorganic chemical industry and secondary resource recovery. Background technique [0002] Active zinc oxide is an important inorganic chemical product with a wide range of uses, mainly used in rubber, paint, ceramics, glass, medicine, chemical industry, food, etc. [0003] At present, the production methods of active zinc oxide at home and abroad mainly include dry method and wet method. Due to factors such as high energy consumption, unstable product quality, special raw material requirements, and high cost, the dry method has limited prospects in industrial development; while the wet method has a wide range of raw materials, relatively low energy consumption, and good product purity. Stable quality, low cost, less environmental pollution and convenient operation have graduall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02
Inventor 杨跃新李栋柴承平
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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