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Method for preparing high-purity metal arsenic from non-ferrous smelting arsenic-containing solid waste in short process

A short-process, metal arsenic technology, which is applied in the direction of improving process efficiency, can solve problems such as the difficulty of separating arsenic from similar impurities, and achieve the effects of industrial production, convenient operation, and low cost

Active Publication Date: 2022-08-02
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the difficulty in separating arsenic from similar impurities in the process of preparing high-purity arsenic from arsenic-containing solid waste in the prior art, the purpose of the present invention is to provide a short-process method for preparing high-purity metallic arsenic from arsenic-containing solid waste in nonferrous smelting. This method utilizes the organic-inorganic interface matching synergy produced by the water-soluble high-molecular organic matter containing carboxyl and / or hydroxyl groups and the hydrophobic high-molecular organic matter with a periodic geometric structure in the reaction system to control the mineralization and crystallization of the arsenate double salt Through the high-precision mineralization and crystallization of arsenic acid double salt, the deep separation of arsenic and antimony, selenium, bismuth and other impurities in the arsenic-containing solid waste alkali immersion solution is realized, and high-purity arsenic is obtained by reduction roasting on this basis. Moreover, the method is fast, efficient, low-cost, and the process is simple and easy to operate, which meets the requirements of industrial production

Method used

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  • Method for preparing high-purity metal arsenic from non-ferrous smelting arsenic-containing solid waste in short process
  • Method for preparing high-purity metal arsenic from non-ferrous smelting arsenic-containing solid waste in short process

Examples

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Embodiment 1

[0027] Take 5kg arsenic alkali slag (main components are As: 4.29%, Sb: 1.62%, Al: 2.41%, Fe: 0.89%, alkali (mainly sodium carbonate): 54.71%) and mix it with 20L water, because the arsenic alkali slag itself It contains alkali, so only an appropriate amount of hydrogen peroxide is added during the leaching process, instead of sodium hydroxide or sodium carbonate. The leaching temperature is controlled at 50 ° C, the stirring intensity is 500 rpm, and the leaching time is 1.5 h. After the leaching is completed, the solid-liquid separation is performed to obtain alkali The main components of the arsenic-containing leaching solution are shown in Table 1, of which the arsenic leaching rate is 92.15%.

[0028] After mixing magnesium oxide and ammonium bicarbonate according to a molar ratio of n(Mg / N)=0.5, then mixing sodium polyacrylate and the mixed agent according to a mass ratio of 5 mg / g to prepare a mixed magnesium ammonium reagent. Chitosan was mixed with 100°C hot water at ...

Embodiment 2

[0043] Take 5kg of lead anode slime (the specific components are Pb: 12.88%, As: 27.53%, Sb: 24.92%, Ag: 5.08%, in which arsenic mainly exists in the form of elemental substance and oxidation state) to carry out oxidative alkali leaching, add an appropriate amount during the leaching process Hydrogen peroxide was used as the oxidant, the liquid-solid ratio was controlled to be 10mL:1g, the dosage of sodium carbonate and sodium hydroxide were both 1mol / L, the temperature was 60°C, the leaching time was 2h, and the stirring speed was 500rpm. After the leaching reaction was completed, the solid-liquid Separation to obtain alkaline arsenic-containing leaching solution, the main components are shown in Table 2, wherein the arsenic leaching rate is 90.47%.

[0044] After mixing magnesium chloride and ammonium chloride according to a molar ratio of n(Mg / N)=0.4, then mixing polyethylene glycol with the mixed agent according to a mass ratio of 8 mg / g to prepare a mixed magnesium-ammoniu...

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Abstract

The invention discloses a short-process method for preparing high-purity metal arsenic from non-ferrous smelting arsenic-containing solid waste. The method comprises the following steps: carrying out oxidation alkaline leaching on the non-ferrous smelting arsenic-containing solid waste to obtain an arsenic-containing alkaline leaching solution; sequentially adding a mixed magnesium ammonium reagent consisting of a water-soluble polymer organic matter containing carboxyl and / or hydroxyl, a magnesium compound and an ammonium compound and a hydrophobic polymer organic matter with a periodic geometric structure into the arsenic-containing alkaline leachate, and stirring for reaction to obtain an arsenic acid double salt crystal wrapped by the organic matter; and roasting the arsenic acid double salt crystal wrapped by the organic matter, then mixing the arsenic acid double salt crystal with carbon powder, carrying out reduction roasting, and condensing and recovering the metal arsenic from the flue gas. According to the method, safe treatment of the non-ferrous smelting arsenic-containing solid waste can be achieved, the arsenic component in the non-ferrous smelting arsenic-containing solid waste can be recycled to prepare the high-purity metal arsenic product, and the method is simple, rapid, efficient and low in cost and meets industrial production.

Description

technical field [0001] The invention relates to a method for resource utilization of arsenic-containing solid waste in non-ferrous smelting, in particular to a method for preparing high-purity metal arsenic from arsenic-containing solid waste, which is suitable for the harmless disposal and resource utilization of arsenic-containing solid waste in non-ferrous smelting Utilize technology fields. Background technique [0002] In traditional cognition, arsenic causes serious environmental pollution and threatens human life and health. However, arsenic is an amphoteric element with very special physical and chemical properties. It is the core raw material of semiconductor materials and is widely used in strategic emerging industries such as chips, electronic information, biomedicine, photovoltaics, military industry, and aerospace. The application of high-end arsenic products using high-purity arsenic as raw materials in new materials, electronic information, biomedicine, high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B30/04C22B7/00C22B1/00C22B5/10
CPCC22B30/04C22B7/008C22B7/001C22B1/005C22B5/10Y02P10/20
Inventor 孙伟韩海生田佳彭竣刘勇沈吉峰胡文吉豪王宇峰张荥斐
Owner CENT SOUTH UNIV
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