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A kind of preparation method of highly stable arsenic-fixing mineral

A high stability, mineral technology, applied in the field of mineral arsenic solidification, to achieve the effect of high stability, convenient operation and easy liquid-solid separation

Active Publication Date: 2019-01-08
CENT SOUTH UNIV
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  • 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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  • A kind of preparation method of highly stable arsenic-fixing mineral

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Effect test

Embodiment 1

[0045] 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.

[0046] 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%.

[0047] 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-fixed minerals adopts the distributed crystallization method, and the control c...

Embodiment 2

[0049] 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.

[0050] 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%;

[0051] 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...

Embodiment 3

[0053] 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.

[0054] 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%

[0055] 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. The synthesis of arsenic-fixing minerals adopts the hydrothermal method, and the control conditions are a...

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Abstract

The invention relates to a preparing method for high-stability solid arsenic mineral. A high-arsenic containing solution is subjected to arsenic removal and is cured, and the arsenic containing solution is subjected to harmless treatment. After trivalent arsenic in the arsenic containing solution is converted into pentavalent arsenic through catalytic oxidation, after oxidization, liquid is synthesized into the high-stability solid arsenic mineral through combination of the lime arsenic deposition method and one of the distribution crystallization method, the regulation and control growth method and the hydrothermal method, and the solid arsenic mineral can be directly stacked. Calcium arsenate is obtained through the lime arsenic deposition method firstly and then is converted into the high-stability solid arsenic mineral through one of the distribution crystallization method, the regulation and control growth method and the hydrothermal method, and toxicity leaching conforms to the GB5085.3-2007(solid waste distinguishing standard-leaching toxicity identification) rule. According to the preparing method, the technology process is short, the arsenic deposition effect is good, the liquid can be directly discharged after arsenic deposition, and the synthesized solid arsenic mineral is high in stability and can be stably stacked within the wide pH value range of 2-11 and under the strong reducing 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 Patents(China)
IPC IPC(8): C22B30/04C22B3/44
CPCC22B3/44C22B30/04
Inventor 刘智勇刘志宏李启厚周亚明李玉虎姚伟姜波
Owner CENT SOUTH UNIV
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