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Method and application of low-temperature solid-phase synthesis of sodium arsenic alunite solid solution

A technology for arsenic alumite and solid-phase synthesis, which is used in the treatment of arsenic-containing waste residues, low-temperature solid-phase synthesis of arsenic alumite solid solution, and the preparation of sulfate minerals, which can solve the problems of poor stability of arsenic compounds, environmental pollution, etc. problem, to achieve the effect of good long-term stability, low economic cost, safe and reliable storage

Active Publication Date: 2017-10-27
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to provide a low-temperature solid-phase synthesis method of sodium arsenite solid solution, which converts the solid easily soluble arsenic substance into an insoluble precipitation compound with high crystallinity and good stability---sodium arsenite solid solution, and the insoluble precipitation compound also has the advantages of low arsenic toxicity leaching concentration, so as to solve the environmental pollution problem caused by the poor stability of arsenic compounds and realize the stabilization of arsenic

Method used

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  • Method and application of low-temperature solid-phase synthesis of sodium arsenic alunite solid solution
  • Method and application of low-temperature solid-phase synthesis of sodium arsenic alunite solid solution

Examples

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Embodiment 1

[0016] Example 1: At room temperature, mix 10g of aluminum sulfate powder and 1g of sodium sulfate powder directly without grinding, add 1g of sodium arsenate, mix again without grinding; put the mixture in a reaction kettle, and react at 100°C for 72h After the reaction, the product was naturally cooled, washed with 500 mL of distilled water, and finally dried at 100°C for 24 hours to obtain arsenite with high crystallinity.

[0017] Performance test: continuous leaching for 4 months, arsenic leaching concentration 2.5mg / L.

Embodiment 2

[0018] Example 2: At room temperature, mix and grind 70g of aluminum sulfate powder and 10g of sodium sulfate powder for 10 minutes, add 14g of sodium arsenate, mix and grind again for 20 minutes, put the mixture in a reaction kettle, and react at 200°C for 5.5 hours After the reaction, the product was naturally cooled, washed with 1000 mL of distilled water, and finally dried at 80° C. for 24 hours to obtain arsenite with high crystallinity.

[0019] Performance test: continuous leaching for 4 months, arsenic leaching concentration 2.0mg / L.

Embodiment 3

[0020] Example 3: At room temperature, 160 g of aluminum sulfate powder and 25 g of sodium sulfate powder were mixed and ground for 20 minutes, 90 g of sodium arsenate was added, and after mixing and grinding for 50 minutes again, the mixture was placed in a reaction kettle and heated at 220° C. After the reaction for 2.5 h, the product was naturally cooled, washed with 800 mL of distilled water, and finally dried at 90°C for 24 hours to obtain arsenite with high crystallinity.

[0021] Performance test: continuous leaching for 4 months, arsenic leaching concentration 1.0mg / L.

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Abstract

The invention discloses a method for preparing arsenic-containing sulfate minerals and its application, in particular to a method for low-temperature solid-phase synthesis of sodium arsenic alunite solid solution and its application in the treatment of arsenic-containing waste residue. The method uses aluminum sulfate Or aluminum nitrate is the Al source, sodium sulfate is the Na source, sodium arsenate, sodium arsenite or arsenic-containing waste residue is the As source, and the crystallinity is high and the stability Good sodium arsenite solid solution; this method is mainly used to transform the easily soluble arsenic substance in the solid phase into insoluble sodium arsenite solid solution, so as to solve the high pressure conditions and reaction conditions required for the traditional hydrothermal synthesis of arsenite. The disadvantages of the kettle are high requirements, high energy consumption, high economic cost, and environmental pollution caused by the poor stability of traditional arsenic compounds; compared with traditional technologies, the obtained arsenic sodium alumite solid solution has good long-term stability, safe and reliable storage, and low economic cost , The reaction conditions are close to industrialization.

Description

technical field [0001] The invention relates to a preparation method and application of sulfate minerals, in particular to a method for low-temperature solid-phase synthesis of arsenic sodium alunite solid solution and its application in the treatment of arsenic-containing waste residue, which belongs to the technical field of environmental protection. Background technique [0002] Arsenic (As) is in the fourth cycle and is a highly toxic element. Arsenic in nature is mostly mixed in gold, copper, lead, zinc, tin, nickel, cobalt and other minerals in the form of sulfide. In the metallurgical industry, with the mining, beneficiation and smelting process of non-ferrous metal minerals, they are dispersed into waste gas, waste residue and wastewater. In my country, more than 2.677 million people have been affected by high arsenic in drinking water and coal burning, and it is one of the countries with the most serious endemic arsenic poisoning. Arsenic is a non-essential elemen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/44
Inventor 周新涛陈小凤罗中秋陶志超陈卓刘守庆
Owner KUNMING UNIV OF SCI & TECH
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