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Bismuth purification method

A purification method and electrolytic purification technology, which is applied in the field of bismuth purification, can solve the problems of increased investment costs such as investment and energy used, and achieve low-cost effects

Pending Publication Date: 2019-02-05
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are problems in that the investment and cost of setting up the furnace and the energy used to realize the dry process increase, and therefore, it is not preferable.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0111] The copper concentrate is put into the furnace, melted at high temperature to separate impurities, and the anode obtained by casting blister copper in this way is immersed in the electrolytic tank filled with sulfuric acid acid solution, and placed in front of the cathode made of copper or stainless steel Electricity is applied between them, and the known copper electrolytic purification method that electrolytically deposits electrolytic copper on the surface of the cathode is used to obtain copper electrolytic slime containing precious metals such as gold and silver. , an acidic solution containing noble metals leached from copper electrolytic slime was prepared.

[0112] Then, sodium hydroxide was added to this acidic solution under normal temperature conditions, and the slurry whose pH was adjusted to 2.6 was obtained. Thereafter, the slurry was solid-liquid-separated into a neutralization precipitate and a neutralization filtrate using a 5C filter paper using a Nuts...

Embodiment 2

[0114] In the same manner as in Example 1 above, the acidic solution obtained after the noble metal was leached from the copper electrolytic slime containing the noble metal was used, and the pH was adjusted to 2.6 by adding a sodium hydroxide solution, and the neutralized precipitate and the neutralized precipitate were obtained in the same manner as in Example 1. and filtrate (neutralization treatment process).

[0115] Then, sodium hydroxide with a concentration of 2 mol / L was added to the neutralized precipitate for leaching to obtain an alkali leaching residue (alkali leaching step). Further, low-concentration sulfuric acid was added to the obtained alkali leaching residue to adjust the slurry concentration to 100 g / L, and stirred for 1 hour to obtain a sulfuric acid leaching solution (sulfuric acid leaching step). The pH of the slurry after adding sulfuric acid was adjusted to 0.8.

[0116] The leaching rate of copper leaching to sulfuric acid leach solution is 53%. On...

Embodiment 3

[0125] Using the same acidic solution as in the above-mentioned Examples 1 and 2, sodium hydroxide was added to the acidic solution under normal temperature conditions to obtain a slurry whose pH was adjusted to 2.6, and thereafter, using the same method as in Examples 1 and 2 Solid-liquid separation into neutralization precipitate and neutralization filtrate (neutralization treatment process). The bismuth grade contained in this neutralized precipitate was 19 weight%, and the chloride ion grade was 11 weight%.

[0126] Then, a sodium hydroxide solution with a concentration of 2 mol / L was added to the neutralized precipitate to make the slurry concentration 100 g / L, and the slurry was stirred for 1 hour while maintaining the temperature of the slurry at 60° C. (alkali leaching process) . Then, solid-liquid separation is performed on the slurry after stirring, the obtained alkali leaching residue is washed with water, and the washed alkali leaching residue obtained by solid-li...

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Abstract

Provided is a bismuth purification method for recovering bismuth from a liquid obtained after recovering precious metals from copper electrolysis slime. The method comprises: 1) a neutralization stepin which an alkali is added to an acidic solution to adjust the pH to a range of 2.0 to 3.0, and then solids and liquid are separated to obtain a neutralized filtrate and a neutralized precipitate; 2)an alkali leaching step in which an alkali is added to the neutralized precipitate obtained in the neutralization step to separate the same into an alkali leachate and an alkali leaching residue; 3)a sulfuric acid leaching step in which sulfuric acid is added to the alkali leaching residue to separate the same into a sulfuric acid leachate and a sulfuric acid leaching residue; 4) a cooling stepfor cooling the sulfuric acid leachate obtained in the sulfuric acid leaching step to obtain bismuth sulfate crystals; 5) a bismuth oxidation step characterized in that an alkali is added to the bismuth sulfate crystals obtained in the cooling step to obtain bismuth oxide; and 6) an electrolysis step in which an acid solution is added to the bismuth oxide obtained in the bismuth oxidation step todissolve the same, and the solution obtained is electro-extracted to obtain metallic bismuth.

Description

technical field [0001] The present invention relates to a method for purifying (refining) bismuth. More specifically, it relates to a purification method for recovering bismuth, which is a valuable metal, from copper electrolysis slime produced in a copper electrolytic purification step. Background technique [0002] As a method of recovering copper from copper-containing ores, the following method is generally used: the copper-containing ore is subjected to a beneficiation process to obtain a copper concentrate in which copper is concentrated, and then the copper concentrate is put into a furnace under high temperature conditions. Melt and perform such dry smelting to obtain blister copper. Next, the blister copper is used as an anode and immersed in a sulfuric acid solution, and an electric current is passed between the anode and the stainless steel plate or copper plate impregnated facing the anode. The flow between the cathodes selectively electro-deposits the copper di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B30/06C22B3/08C22B3/44C22B7/00C25C1/22
CPCC22B30/06C25C1/22C25C1/12C22B7/008C22B7/007C22B11/042C22B3/44C22B7/006Y02P10/20
Inventor 竹之内宏加地伸行永仓俊彦竹田贤二浅野聪
Owner SUMITOMO METAL MINING CO LTD
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