Method for preparing high-stability solid arsenic minerals through distributed crystallization method

A technology with high stability and distributed crystallization, which is applied in the field of mineral arsenic fixation to achieve the effects of small BET specific surface area, high crystallinity and mild reaction conditions

Active Publication Date: 2017-06-13
CENT SOUTH UNIV
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Problems solved by technology

[0005] Among the currently published patents, the invention patent (CN 102153145 A, CN101952204A) of Dowa Mining Co., Ltd. in Japan proposed for the first time to use ferrous iron as the iron source to process the arsenic-containing solution, and to prepare scorodite and iron arsenate powder. Arsenic is thorough, simple and convenient, but the prepared scorodite and ferric arsenate can only be stored stably in a narrow pH range (2-6), and the toxicity of arsenic leaching under alkaline or strong reducing conditions far exceeds that of GB5085. 3-2007 National Standard Limit (<5mg / L)

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  • Method for preparing high-stability solid arsenic minerals through distributed crystallization method

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Effect test

Embodiment 1

[0039] The main components in the arsenic solution include: As 60g / L, Sb 1.1g / L, Pb 235ppm, Sn 38.5ppm, Te24.4ppm, NaOH 30g / L.

[0040] A kind of preparation method of highly stable arsenic-fixed mineral, comprises the following steps: arsenic-containing solution adopts the method for catalytic oxidation to As 3+ Oxidized to As 5+ , the control conditions are, the oxygen flow rate is 5L / min, adding KMnO 4 As a catalyst, the molar ratio of As / Mn is controlled at 10:1, and the temperature of the catalytic oxidation system is controlled at 90°C. The results show that As 3+ The conversion rate was 98.45%.

[0041] Adjust the pH value of the oxidized solution to 1.5, and add CaO and Ca(OH) in a continuous feeding mode 2As an arsenic precipitating agent, the Ca / As molar ratio is 5, the settling time is 6 hours, and the reaction temperature is 60° C. to generate calcium arsenate. Synthesis of arsenic-fixed minerals adopts the distributed crystallization method, and the control co...

Embodiment 2

[0043] The main components in the arsenic solution include: As 76g / L, Sb 0.8g / L, Pb 96.7ppm, Sn 27.5ppm, Te38.7ppm, NaOH 25g / L.

[0044] A kind of preparation method of highly stable arsenic-fixed mineral, comprises the following steps: arsenic-containing solution adopts the method for catalytic oxidation to As 3+ Oxidized to As 5+ , the control conditions are, oxygen flow rate is 10L / min, adding KMnO 4 As a catalyst, the molar ratio of As / Mn was controlled at 40:1, and the temperature of the catalytic oxidation system was controlled at 30°C. The results showed that As 3+ The conversion rate is 92.31%;

[0045] Adjust the pH value of the oxidized solution to 2, and add CaO and Ca(OH) in a continuous feeding mode 2 As the arsenic precipitating agent, the Ca / As molar ratio is 8, the settling time is 8 hours, and the reaction temperature is 90° C. to generate calcium arsenate. Synthesis of arsenic-fixed minerals adopts the distributed crystallization method, and the control c...

Embodiment 3

[0047] The main components in the arsenic solution include: As 50g / L, Sb 1.8g / L, Pb 186ppm, Sn 34.7ppm, Te27.8ppm, NaOH 5g / L.

[0048] A kind of preparation method of highly stable arsenic-fixed mineral, comprises the following steps: arsenic-containing solution adopts the method for catalytic oxidation to As 3+ Oxidized to As 5+ , the control conditions are, oxygen flow rate is 1L / min, adding KMnO 4 As a catalyst, the molar ratio of As / Mn was controlled at 20:1, and the temperature of the catalytic oxidation system was controlled at 120°C. The results showed that As 3+ The conversion rate is 89.36%

[0049] Adjust the pH value of the oxidized solution to 1.5, and add CaO and Ca(OH) in a continuous feeding mode 2 As an arsenic precipitating agent, the Ca / As molar ratio is 5, the settling time is 10 hours, and the reaction temperature is 60° C. to generate calcium arsenate. Synthesis of arsenic-fixed minerals adopts the distributed crystallization method, and the control co...

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Abstract

The invention relates to a method for preparing high-stability solid arsenic minerals through a distributed crystallization method. The method comprises the following steps: removing arsenic from a high-arsenic-content solution and curing the solution, so as to carry out harmless treatment on the arsenic-containing solution. According to the method disclosed by the invention, trivalent arsenic in the arsenic-containing solution is catalytically oxidized into pentavalent arsenic; and the oxidized solution is synthesized into the high-stability solid arsenic minerals through a lime arsenic settling method and the distributed crystallization method, and the high-stability solid arsenic minerals can be directly stockpiled. Calcium arsenate is obtained firstly through the lime arsenic settling method, and then the calcium arsenate is turned into the high-stability solid arsenic minerals through the distributed crystallization method; and toxicity extraction meets the specifications of GB5085.3-2007 (solid waste authentication standard-extraction toxicity authentication). The method is short in technological flow and good in arsenic settling effect; the solution subjected to arsenic settling can be directly discharged, and the synthesized solid arsenic minerals are high in stability and can be stably stockpiled within a wide pH range of 2 to 11 and under a strong reducing property condition.

Description

technical field [0001] The invention belongs to the technical field of mineral arsenic fixation and relates to a preparation method of highly stable arsenic fixation mineral. Background technique [0002] Arsenic is a highly toxic element with high carcinogenicity, and is widely associated in various non-ferrous metal smelting process systems. In the past 30 years, with the rapid development of my country's nonferrous metal industry, the problem of arsenic pollution has become more and more serious, seriously threatening people's lives and health. Therefore, the research on arsenic pollution control is an urgent and significant topic. [0003] At present, arsenic fixation technologies mainly include encapsulation and mineral arsenic fixation. Encapsulation is to use cement, glass and other materials to coat arsenic-containing materials so that they can be stored stably. This method has a large amount of solid waste and high cost, making it difficult to be widely used. Mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/33A62D101/40
CPCA62D3/33A62D2101/40
Inventor 刘智勇刘志宏李启厚周亚明李玉虎姚伟蒋涛
Owner CENT SOUTH UNIV
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