Wet circulation desulfurization process for high-sulfur anode slime

Abstract

The invention discloses a wet circulating desulfurization process for high-sulfur anode slime. The wet circulating desulfurization process comprises the following steps: step 1, adding a dehydrating agent into the high-sulfur anode slime in a mixing dryer; 2, the dehydrated and dried high-sulfur anode slime is transferred into a reaction kettle, and a solvent is added into the reaction kettle through a solvent tank; step 3, transferring a product in the step 2 into a first filter, transferring a liquid phase filtered by the first filter into a crystallization kettle for cooling crystallization, cooling a crystallized product to room temperature, transferring the crystallized product into a second filter for filtering, and transferring a slag phase filtered by the first filter into a slag warehouse; and 4, conveying a liquid phase filtered by the second filter to a solvent tank for recycling, and conveying a slag phase filtered by the second filter to a sulfur product warehouse, wherein the slag phase is elemental sulfur. The method has the advantages of reasonable process flow, simplicity in operation, high desulfurization effect and high recycling rate.

Description

technical field [0001] The invention relates to the technical field of anode slime treatment in metallurgical industry, in particular to a wet cyclic desulfurization process for high-sulfur anode slime. Background technique [0002] High-sulfur anode slime is an insoluble slime that adheres to the surface of the residual anode or settles at the bottom of the electrolytic cell during the electrometallurgical process of aqueous solution. Most of the components exist in the form of metals, sulfides, selenium-tellurium compounds, oxides, elemental sulfur and basic salts, and also contain about 10% moisture. Precious metals, rare metals and other valuable metals are enriched in anode slime, and great economic benefits can be achieved by extracting these metals from anode slime. High-sulfur anode slime contains 60% or more of elemental sulfur, and it is difficult to recover valuable metals by pyrolysis. [0003] At present, there are two methods for enriching valuable metals in ...

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Problems solved by technology

High-sulfur anode slime contains 60% or more of elemental sulfur, so it is difficult to recover valuable metals by fire method

[0003] At present, there are two ways to enrich valuable metals in high-sulfur anode slime. One is the thermal filtration process, which melts sulfur by heating, and obtains elemental sulfur and hot filter residue after filtration, but the sulfur content of the hot filter residue is still 40% or higher. Above, the enrichment efficiency is low; the other is the wet lye desulfurization method, the efficiency has been significantly improved, but nickel is easy to react with alkali to form nickel hydroxide, nickel hydroxide is a green crystal or amorphous powder, which seriously affects In order to improve the filtration performance, there is no suitable filtration equipment for industrial production

[0004] In organic solvent desulfurization, the solvent can be carbon disulfide, tetrachlorethylene, kerosene, toluene, etc. The above solvents are good solvents for sulfur, but the high-sulfur anode slime contains about 10% of water, which is heat-sensitive, acidic, and easy to form. Block and other characteristics, in the process of dissolving sulfur, the desulfurization efficiency is low

Therefore, the existing desulfurization methods are difficult to apply to the desulfurization of high-sulfur anode slime, and the existing desulfurization methods need to be further improved

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