A method for extracting gallium from fly ash based on resin method

Abstract

The invention provides a method for extracting gallium from fly ash based on a resin method. The crude semen obtained after acid leaching of fly ash is used as a raw material. Gathering gallium, neutralizing and removing iron, transformation and precipitation of gallium, liquid making and purification, electrolytic deposition and other steps, thus realizing the extraction of gallium from fly ash. Compared with the existing technology, the method of the present invention is based on the resin method, the amount of reagents such as lye is significantly reduced, and there is no need to use additional reagents such as iron masking agent and reducing agent, avoiding the generation of a large amount of waste water, economical and environmentally friendly, and the extraction efficiency of gallium has also been greatly improved. The method of the invention has stable process, reliable operation and controllable cost, and is a novel gallium extraction process with very promising application prospects.

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...

AI Technical Summary

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

Images