In the indium extraction process, the combined extraction centrifugal extractor plays a vital role, especially in the key extraction and de-extraction steps play an irreplaceable role. The following is a detailed analysis of the process flow, with special emphasis on the application of the combined extraction centrifugal extractor:

Indium-containing raw materials:

Indium is usually found as a by-product in other metal ores, such as sulfide ores of zinc, lead, tin, and copper, and is extracted by a specific process.

Enrichment:

First of all, the indium-containing materials are enriched by physical or chemical methods to increase the indium content and lay the foundation for subsequent efficient extraction.

Chemical dissolution:

The enriched indium-containing material is mixed with a suitable solvent (such as sulfuric acid) for leaching operation, so that indium is dissolved in the solution to form indium-containing leaching solution.

Purify:

The indium-containing leaching solution is purified, and impurities and interfering substances are removed by precipitation, filtration, adsorption, etc., to ensure the smooth progress of the subsequent extraction process.

Extraction:

Core step: At this stage, the combined extraction centrifugal extractor is introduced for an efficient extraction operation. The carefully prepared organic extractant (such as P204 and kerosene mixture) and the purified indium-containing solution are added to the combined extraction centrifugal extractor. Under the action of strong centrifugal force, the two phases can be quickly mixed and effectively separated, and indium ions are efficiently transferred from the water phase to the organic phase. The efficient, fast and continuous operation of the combined extraction centrifugal extractor greatly improves the extraction efficiency.

In order to further improve the extraction effect, the process often adopts multistage countercurrent extraction technology.

Back extraction:

Subsequently, an appropriate stripping agent (such as hydrochloric acid) is added to the combined extraction centrifugal extractor to react with the indium-containing organic phase, prompting indium to be released from the organic phase and transferred to the aqueous phase to form an indium chloride solution. This process is also done in a combined extraction centrifugal extractor, ensuring efficient phase separation and recovery.

Zinc (aluminum) replacement:

In some processes, zinc powder or aluminum powder is used to displace indium chloride solution to form indium sponge and further purify indium.

Under optimized conditions, the combined extraction centrifugal extractor shows excellent performance in the extraction process of indium, and its extraction efficiency can reach a very high level. Through fine process design and precise optimization of operating parameters, the extraction rate of indium can approach or reach an excellent level of 99%.

The combined extraction centrifugal extractor is not only the key technical equipment in the indium extraction process, but also the key to promote the efficient and stable operation of the entire process. From the initial treatment of indium-containing raw materials to the final production of high purity refined indium, the entire process goes through multiple steps such as enrichment, chemical dissolution, purification, extraction, back extraction, replacement and possibly electrolytic refining, each step is inseparable from the precision operation and excellent contribution of the extraction centrifuge extracter. This process system has been widely used in industrial production, and has been continuously optimized and improved with the continuous progress of technology.