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Method for preparing high-stability arsenic fixing minerals through adjusted and controlled growth process

A high-stability, mineral-based technology, applied in protection devices against harmful chemicals, etc., to achieve mild reaction conditions, high stability, and small BET specific surface area

Active Publication Date: 2017-06-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Among the currently published patents, the invention patents (CN 102153145 A, CN101952204 A) of Dowa Mining Co., Ltd. in Japan first proposed to use divalent iron as the iron source to process the arsenic-containing solution and prepare scorodite and iron arsenate powder. Arsenic precipitation 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 limits (<5mg / L)

Method used

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  • Method for preparing high-stability arsenic fixing minerals through adjusted and controlled growth process

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Experimental program
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Effect test

Embodiment 1

[0040] 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.

[0041] 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%.

[0042] 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 6 hours, and the reaction temperature is 60° C. to generate calcium arsenate. Synthesis of arsenic-fixing minerals adopts a regulated growth method. The control conditions are to ...

Embodiment 2

[0044] 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.

[0045] 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 is controlled at 40:1, and the temperature of the catalytic oxidation system is controlled at 30°C. The results show that As 3+ The conversion rate is 92.31%;

[0046] 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-fixing minerals adopts a regulated growth method. The control conditions are to add...

Embodiment 3

[0048] 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.

[0049] 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 is controlled at 20:1, and the temperature of the catalytic oxidation system is controlled at 120°C. The results show that As 3+ The conversion rate is 89.36%

[0050] Adjust the pH value of the oxidized solution to 1.5, and add CaO and Ca(OH) in a continuous feeding mode 2 As the arsenic precipitating agent, the Ca / As molar ratio is 5, the settling time is 5 hours, and the reaction temperature is 60° C. to generate calcium arsenate. Synthesis of arsenic-fixing minerals adopts a regulated growth method. The control conditions are to add ...

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Abstract

The invention relates to a method for preparing high-stability arsenic fixing minerals through an adjusted and controlled growth process. The method comprises the step of removing arsenic from a high-arsenic solution and curing the high-arsenic solution, thereby realizing innocent treatment on an arsenic containing solution. According to the method, after trivalent arsenic in the arsenic-containing solution is converted into pentavalent arsenic through catalytic oxidation, the oxidized solution is synthesized into high-stability arsenic fixing minerals through a lime arsenic precipitation process-adjusted and controlled growth process, and the high-stability arsenic fixing minerals can be directly piled up. Calcium arsenate is firstly obtained through the lime arsenic precipitation process, and then calcium arsenate is converted into high-stability arsenic fixing minerals through the adjusted and controlled growth process, so that toxicity leaching meets regulations of GB5085.3-2007(solid waste identification standards-leaching toxicity identification). The method is short in technological process and is good in arsenic precipitation effect; the arsenic-precipitated solution can be directly exhausted, and the synthesized arsenic fixing minerals are high in stability, and can be stably piled up within a wide pH value range of 2-11 under strong reducing conditions.

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柯平超姜波
Owner CENT SOUTH UNIV
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