Method for preparing metal bismuth by adopting parallel diaphragm electrodeposition module

Abstract

The invention belongs to the technical field of hydrometallurgy electro-deposition, and provides a method for preparing metal bismuth by adopting a parallel diaphragm electro-deposition module, which comprises the following steps of: pumping a methanesulfonic acid system electro-deposition liquid from a liquid storage tank into a head tank through a heat exchanger; the liquid flows into a distribution tank from the head tank and is conveyed to a cathode chamber of the diaphragm electrodeposition module through a feed liquid branch pipe and a cathode chamber liquid supply pipe; feed liquid in the cathode chamber flows to the circulating tank through a cathode chamber liquid discharge pipe via a cathode chamber overflow port, and then is conveyed to an anode chamber of the diaphragm electrodeposition module through a circulating pump and an anode chamber liquid supply pipe; and the feed liquid in the anode chamber flows to the recovery tank through the anode chamber overflow port. According to the method, the situation that ferrous ions migrate back and forth between the cathode and the anode in the electrodeposition process and consequently the current efficiency is greatly reduced can be avoided through the arrangement of the anion diaphragm and the control over the flow mode of the electrodeposition liquid, and the iron methanesulfonate-methanesulfonic acid solution in the anode chamber can be returned to the bismuth-containing material wet leaching procedure to serve as a leaching agent to be recycled.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgical electrodeposition, in particular to a method for preparing metal bismuth by using a parallel diaphragm electrodeposition module. Background technique [0002] As a rare strategic metal, bismuth is widely used in metallurgical additives, chemical industry, optoelectronic materials, medicine, cosmetics and other fields. my country is rich in bismuth resource reserves, totaling 500,000 to 600,000 tons, but bismuth rarely forms a single deposit in nature, and most of it is associated with lead, tin, copper and other minerals. In the metallurgical process of refining the main metals lead, tin and copper, bismuth is usually enriched in intermediate products or by-products such as lead anode slime, copper smelting dust or black copper powder, and then metal bismuth is recovered by the all-wet method or the fire-wet combined process. [0003] The reserves of bismuth resources in the Shizhuyuan...

AI Technical Summary

Problems solved by technology

Iron powder replacement and neutralization and hydrolysis of bismuth precipitation process have a large amount of wastewater discharge and high treatment costs; while the electrodeposition process of chloride salt system also has problems such as strong volatility of electrodeposited liquid, poor morphology of cathode bismuth, and easy generation of chlorine gas.

[0004] The prior art discloses the use of bismuth with high solubility, low volatility, strong conductivity, stable performance, and biodegradable methanesulfonic acid as a leaching agent, and adding ferrous ions as a catalyst. The high-efficiency and green extraction of bismuth sulfide concentrate can be realized under the condition of high-efficiency and green extraction, but a large amount of iron will be leached during the leaching process

Images