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Method for selectively removing arsenic from arsenic-containing acid solution

An arsenic-containing acid and acidic solution technology is applied in the field of selective arsenic removal, which can solve the problems of trivalent arsenic ion oxidation, high consumption of potassium permanganate, and high cost of arsenic removal, and achieves low loss of valuable metals and low cost of arsenic removal. The effect of extremely high metal loss and high removal rate

Pending Publication Date: 2021-12-07
취저우화여우코발트뉴머터리얼컴퍼니리미티드 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Using a strong oxidant, such as potassium permanganate, can oxidize trivalent arsenic ions to pentavalent arsenic ions, but since pentavalent arsenic ions themselves are strong oxidants, potassium permanganate consumes a lot and the cost of arsenic removal is high
[0005] For this reason, some researchers use oxygen-enriched air and / or industrial pure oxygen oxidation treatment, but when oxygen-enriched air and / or industrial pure oxygen oxidation treatment is used, it is difficult to oxidize trivalent arsenic ions to pentavalent arsenic ions under normal pressure and low temperature conditions. For arsenic ions, high temperature above 150°C and high pressure above 0.5MPa must be used to stably oxidize trivalent arsenic ions to pentavalent arsenic ions, resulting in high energy consumption and high cost

Method used

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Embodiment 1

[0029] A method for selectively removing arsenic from an arsenic-containing acidic solution, the technological process of which is as follows figure 1 shown, including the following steps:

[0030] 1) Take 8L of arsenic-containing solution (composition of arsenic-containing solution: total As0.55g / L; Fe(III)5.64g / L; Co2.78g / L; Cu0.25g / L; Ni2.20g / L; pH0. 89) placed in a reaction kettle, using a peristaltic pump to add H with a mass concentration of 30% 2 o 2 Oxidation (H 2 o 2 The addition rate was 3 mL / min, and the oxidation temperature was 70 °C). Stop adding H when the potential of the reaction solution reaches 370mV 2 o 2 , the oxidation is complete.

[0031] 2) adding sodium hydroxide to the oxidized arsenic-containing solution to adjust the pH of the solution to 2.2. The system temperature of the water bath control solution is 70° C. and the timed stirring precipitation, the precipitation time is 30min; the filtration separation obtains the precipitate (its SEM sp...

Embodiment 2

[0033] A method for selectively removing arsenic from an arsenic-containing acidic solution, the technological process of which is as follows figure 1 shown, including the following steps:

[0034] 1) Take 8L of arsenic-containing solution (composition of arsenic-containing solution: total As0.45g / L; Fe(III)5.24g / L; Co2.58g / L; Cu0.19g / L; Ni2.11g / L; pH1. 25) placed in the reactor, using a peristaltic pump to add mass concentration of 30% H 2 o 2 Oxidation (H 2 o 2 The addition rate was 3 mL / min, and the oxidation temperature was 70 °C). Stop adding H when the potential of the reaction solution reaches 430mV 2 o 2 , the oxidation is complete.

[0035] 2) adding sodium hydroxide to the oxidized arsenic-containing solution to adjust the pH of the solution to 2.2. The water bath controls the system temperature of the solution to be 70°C and timed to stir and precipitate, the precipitation time is 30 minutes; filter and separate to obtain the precipitate and the solution aft...

Embodiment 3

[0037] A method for selectively removing arsenic from an arsenic-containing acidic solution, the technological process of which is as follows figure 1 shown, including the following steps:

[0038] 1) Take 8L of arsenic-containing solution (composition of arsenic-containing solution: total As0.74g / L; Fe(III)5.84g / L; Co2.68g / L; Cu0.27g / L; Ni2.38g / L; pH1. 19) placed in the reactor, using a peristaltic pump to add mass concentration of 30% H 2 o 2 Oxidation (H 2 o 2 The addition rate was 3 mL / min, and the oxidation temperature was 70 °C). Stop adding H when the potential of the reaction solution reaches 430mV 2 o 2 , the oxidation is complete.

[0039] 2) adding sodium hydroxide to the oxidized arsenic-containing solution to adjust the pH of the solution to 2.4. The water bath controls the system temperature of the solution to be 70°C and timed to stir and precipitate, the precipitation time is 30 minutes; filter and separate to obtain the precipitate and the solution aft...

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Abstract

The invention discloses a method for selectively removing arsenic from an arsenic-containing acid solution. The method comprises the following steps: adding a clean oxidant into an acidic solution containing ferric ions and trivalent arsenic ions to carry out oxidation reduction, and controlling the potential of the solution to be 350-450mV to obtain an oxidized solution; then adjusting the pH value of the solution to 1.5-2.8; then heating to 60-80 DEG C, stirring and precipitating; and filtering and separating to obtain a precipitate and a liquid after arsenic precipitation. In the acid solution, the concentration of the trivalent arsenic ions is 0.30-1.0 g / L; the concentration of ferric ions is 4.0-6.0 g / L; and the pH value of the acid solution is 0.8-1.3. According to the method, nucleation growth of iron arsenate is realized under the condition of low pH value, so that separation of arsenic from a reaction solution system is realized; according to the method, removal and recycling of arsenic in the arsenic-containing solution are achieved; no toxic or harmful substance is generated in the whole technological process; and secondary pollution to the environment is avoided.

Description

technical field [0001] The invention relates to the technical field of arsenic removal by hydrometallurgy, in particular to a method for selectively removing arsenic from an arsenic-containing acidic solution. Background technique [0002] Arsenic exists mainly in the form of trivalent arsenic and pentavalent arsenic in nature and mineral raw materials. When leaching minerals with acid or alkali in hydrometallurgy, arsenic in materials can be leached out, and the harm of arsenic to metallurgy and the environment is well known. The arsenic in the solution must be converted into insoluble arsenate for removal. [0003] At present, the arsenic removal method is mainly iron hydroxide or aluminum hydroxide adsorption method, and it is only physical adsorption, and mainly adsorbs trivalent arsenic ions. When encountering acid or water, arsenic ions are easily dissolved and eluted, resulting in secondary arsenic pollute. So far, it has not been found that trivalent arsenic ions f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C22B30/04C01G49/00
CPCC22B3/44C22B30/04C01G49/00Y02P10/20
Inventor 邓维郑泽翰洪涛符致远袁正兴蒋炎顺
Owner 취저우화여우코발트뉴머터리얼컴퍼니리미티드