Method for extracting gallium from fly ash on basis of resin method

Abstract

The invention provides a method for extracting gallium from fly ash on the basis of a resin method. An acid leaching solution obtained after acid leaching treatment of the fly ash is used as a raw material, the method includes the steps of preparation of a gallium extracting stock solution with the resin method, separation and enrichment of the gallium with the resin method, neutralization for removal of iron, transformation for deposition of the gallium, solution making and purification, electrolytic deposition and the like, and thus the gallium is extracted from the fly ash. Compared with existing technologies, the method has the advantages that the method is based on the resin method, the use amount of reagents such as alkaline liquor and the like are obviously reduced, additional reagents such as an iron masking agent, a reducing agent and the like are not required to be used, production of a lot of waste water is avoided, the method is economical and environment-friendly, and theextraction efficiency of the gallium is substantially improved. The method is stable in technology, reliable in running and controllable in cost and is a novel gallium extracting technology having thegreat application prospect.

Description

technical field [0001] The invention relates to the field of hydrometallurgy, in particular to a method for extracting gallium from fly ash based on a resin method. Background technique [0002] Gallium is an important scattered metal. With the deepening of the international mining structure, the development and utilization of scattered metals is being raised to a strategic level by many countries. At present, the output of primary gallium in the world is about 300t / a, and the recycling level is extremely low. Due to the associated relationship, if the output is not increased, there will be a serious shortage in the next 20 to 30 years. [0003] Gallium is mainly dispersed in bauxite, lead-zinc ore, coal, copper, and iron ore, with an average content of about 50 μg / g. At present, about 90% of gallium in the world is recovered from the alumina production process. In recent years, the extraction of alumina from fly ash has become a research and development hotspot. The conten...

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Problems solved by technology

At present, some methods of extracting gallium have been disclosed. For example, Chinese patent CN 102191384A "A method for extracting gallium from fly ash" discloses a method for extracting gallium from fly ash in a circulating fluidized bed. Using cation exchange resin to directly recover gallium from the acid leaching solution, this method needs to precipitate all the iron ions in the solution, and the alkali consumption is high; another example, the patent CN 104018012A "a method for extracting gallium from aluminum chloride solution" A method for extracting gallium from an aluminum chloride solution is disclosed. In the method, an iron ion masking agent is first added to the pickling solution to reduce iron ions, and then gallium is recovered through an anion exchange resin. The iron ion masking agent can be sodium sulfite, ascorbic acid , iron powder, etc.; at room temperature, the amount of ascorbic acid used is large and the cost is high, and the ascorbic acid reduction solution is not stable enough when heated, the reduction is not complete when sodium sulfite is used, and the adsorption effect of gallium is poor. When iron powder is used for reduction, gallium is extracted while A large amount of ferrous chloride solution (twice the iron content in the original solution) is produced, which increases the difficulty of waste liquid treatment

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