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Method for in-situ precipitation and separation of arsenic in copper electrolyte

A copper electrolyte and in-situ precipitation technology, which is applied in the direction of electrolysis components, electrolysis process, instruments, etc., can solve the problems of electrolysis process influence, large addition, increase the processing space and cost of purified electrolyte, and achieve high-efficiency settlement and reduce The effect of the nucleation barrier

Active Publication Date: 2020-10-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method needs to add a large amount of oxidizing agent and neutralizing agent when regulating the pH and Eh of the electrolyte.
In addition, when using this method to treat the electrolyte, it will affect the electrolysis process, and the electrolyte in the electrolytic cell needs to be transported, and a separate purification workshop should be established for this purpose, which will increase the processing space and cost of purifying the electrolyte

Method used

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  • Method for in-situ precipitation and separation of arsenic in copper electrolyte
  • Method for in-situ precipitation and separation of arsenic in copper electrolyte
  • Method for in-situ precipitation and separation of arsenic in copper electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Taken from a copper electrolyte in a smelter, the concentrations of As in it are 3407mg / L, Sb382mg / L, and Bi787mg / L. Take 2L of the electrolyte in the electrolytic cell, and place it in a water bath at a constant temperature of 70°C, use a peristaltic pump to control the circulation rate of the electrolyte to 50ml / L, and the circulation mode is bottom-in and top-out / parallel plates Liquid, the distance between the cathode and anode plates is controlled to be 2.5cm, and the distance between the center of the liquid inlet and the anode plate is 2.2cm, and the current density is 500A / m 2 Carry out the reaction, after the reaction is carried out for 4 hours, add the seed crystal from the liquid inlet pipe through the peristaltic pump, the amount of the added seed crystal is 1g, collect the precipitate produced after two days of reaction and do corresponding SEM and XRD detection, the detection results are as follows image 3 shown. From the test results, it can be seen tha...

Embodiment 2

[0030] Taken from a copper electrolyte in a smelter, the concentrations of As in it are 3407mg / L, Sb382mg / L, and Bi787mg / L. Take 2L of the electrolyte in the electrolytic cell, and place it in a water bath at a constant temperature of 70°C, use a peristaltic pump to control the circulation rate of the electrolyte to 50ml / L, and the circulation mode is bottom-in and top-out / parallel plates Liquid, the distance between the cathode and anode plates is controlled to be 2.5cm, and the distance between the center of the liquid inlet and the anode plate is 2.2cm, and the current density is 500A / m 2 Carry out the reaction, after the reaction is carried out for 4 hours, add the seed crystal from the liquid inlet pipe through the peristaltic pump. The amount of the added seed crystal is 2g. After two days of reaction, the precipitate produced is collected and tested by SEM and XRD. The test results are as follows: Figure 4 shown. From the test results, it can be seen that the precipit...

Embodiment 3

[0032] Taken from a copper electrolyte in a smelter, the concentrations of As in it are 3407mg / L, Sb382mg / L, and Bi787mg / L. Take 2L of the electrolyte in the electrolytic cell and place it in a water bath at a constant temperature of 70°C. Use a peristaltic pump to control the circulation rate of the electrolyte to 50ml / L. The distance between the anode plates is 2.5cm, and the distance between the center of the liquid inlet and the anode plate is 0.3cm, and the current density is 500A / m 2 Carry out the reaction, after the reaction is carried out for 4 hours, add the seed crystal from the liquid inlet pipe through the peristaltic pump. The amount of the added seed crystal is 2g. After two days of reaction, the precipitate produced is collected and tested by SEM and XRD. The test results are as follows: Figure 5 shown. From the test results, it can be seen that the precipitate obtained under this condition has a single phase, mainly BiAsO 4 Substance; ellipsoidal particles, ...

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Abstract

The invention discloses a method for in-situ precipitation and separation of arsenic in copper electrolyte. In a copper electrolytic refining process, the current density is controlled to be 400-600 A / m2; reaction is performed adopting a way that liquid is fed from bottom and discharged from the top or the liquid is fed between parallel polar plates; and moreover, BiAsO4 seed crystals are added after the reaction is performed for at least 4 hours so as to from in-situ induction of arsenic-containing crystalline precipitates in the copper electrolyte. according to the method disclosed by the invention, by utilizing the characteristic that substances containing arsenic, stibium and bismuth in the copper electrolyte can easily react with one another and on the premise of guaranteeing normal running of an electrolysis process, the formation and growth of arsenic-containing crystalline precipitates are induced by a synergistic effect of relevant parameters (current density, circulation wayof the electrolyte, the distance between an anode plate and an electrolyte inlet, and the concentration of the seed crystal) during electrolytic refining, thereby realizing high-efficiency sedimentation of the precipitates in the electrolyte and in-situ separation between the precipitates and muddy substances such as anode mud.

Description

technical field [0001] The invention belongs to the field of arsenic removal and purification of copper electrolyte in nonferrous metal hydrometallurgy process, and specifically relates to a method for in-situ precipitation and separation of arsenic in electrolyte in copper electrolytic refining process. Background technique [0002] Copper electrolytic refining is a method widely used to prepare high-purity copper products. During the electrolytic refining process, the anode copper is dissolved under the action of electric current and acidic electrolyte, and then the dissolved copper ions are brought to the vicinity of the cathode surface by the circulating electrolyte and deposited on the cathode plate by electrochemical reaction, thereby obtaining higher purity Cathode copper (purity above 99.95%). However, during the electrolytic refining process, the soluble impurities in the anode (such as As, Sb, Bi, etc.), because their potential is close to that of copper, these im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/12C25C7/06
CPCC25C1/12C25C7/06Y02P10/20
Inventor 曾伟志胡辉郭文香刘山伍琳熊长齐晏阳
Owner CENT SOUTH UNIV
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