Low-temperature solid-phase method for synthesis of arsenic natroalunite

A technology of sodium arsenic alunite and solid phase synthesis, applied in the treatment of arsenic-containing waste residue, low-temperature solid phase synthesis of sodium arsenic alunite solid solution, the field of sulfate mineral preparation, can solve the problem of poor stability of arsenic compounds, environmental pollution, etc. problem, to achieve good long-term stability, low economic cost, and good stability

Active Publication Date: 2015-11-11
KUNMING UNIV OF SCI & TECH
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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

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  • Low-temperature solid-phase method for synthesis of arsenic natroalunite
  • Low-temperature solid-phase method for synthesis of arsenic natroalunite

Examples

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Embodiment 1

[0016] Example 1: At room temperature, directly mix 10 g of aluminum sulfate powder and 1 g of sodium sulfate powder without grinding, add 1 g of sodium arsenate, mix again without grinding; place the mixture in a reaction kettle, and react at 100° C. for 72 hours 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 reacting for 2.5 hours, 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 present invention discloses a preparation method and application of a sulfate mineral containing arsenic, and particularly relates to a low-temperature solid-phase method for synthesis of an arsenic natroalunite solid solution and application thereof. The method uses aluminum sulfate or aluminum nitrate as an Al source, sodium sulfate as a Na source, arsenic, sodium arsenite or arsenic waste residue as an As source, and conducts a solid phase reaction at 100-220 DEG C for 2.5-72 h, so as to synthesize the arsenic natroalunite solid solution with high crystallinity and good stability. The method is mainly used in the transformation of solid phase soluble arsenic substances into poorly soluble arsenic natroalunite solid solution, solves the disadvantages of required high pressure, high requirements on the reactor, huge energy consumption and high economic cost in the conventional hydrothermal synthesis of arsenic natroalunite, as well as environmental pollution caused by poor stability of conventional arsenic compound. Compared to prior art, the obtained arsenic natroalunite solid solution has advantages of good long-term stability, safe and reliable storage, low economical cost, and reaction conditions close to the 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 Applications(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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