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High-purity manganese sulfate extraction adopts centrifugal extraction-washing-back extraction technology to meet battery-grade requirements

High-purity manganese sulfate is mainly used in the production of nickel-cobalt lithium manganate ternary lithium battery cathode ternary or binary material precursors and high-purity manganese oxides. It has high requirements on the purity of manganese sulfate, especially the content of harmful impurities such as potassium, sodium, calcium and magnesium must be controlled to be less than 5.0×10‑5.

So, how can we prepare battery-grade high-purity manganese sulfate that meets the requirements? The removal of calcium and magnesium is always a major problem in the production of high-purity manganese sulfate. The methods for removing calcium and magnesium in manganese sulfate mainly include crystallization and electrolysis. method, chemical precipitation and extraction. Compared with other methods, the extraction method has short process, high efficiency and low energy consumption, and has become the mainstream of producing high-purity manganese sulfate

As a world-renowned liquid-liquid extraction technology and equipment service provider, the liquid liquid centrifugal extraction system launched by Prosea has achieved good application results in the field of high-purity manganese sulfate extraction. According to the specific process section, different numbers of centrifugal extractors are used to form different stages of extraction-washing-extraction unit, raffinate manganese extraction-deoiling unit, and extractant pickling unit. The centrifugal extractor has a compact structure, flexible equipment layout and installation, and various process materials can quickly establish a phase balance in the extractor, which greatly shortens the test time; and the internal volume of the machine is small, reducing the consumption of extraction agents and materials, and saving investment costs. .

Its technological process is mainly:

1. Extraction-washing-extraction unit: the extraction agent enters the extraction section from the first stage light phase inlet, the manganese material enters from the last stage heavy phase inlet of the extraction section, and the manganese in the manganese material enters the saponification after phase inversion in the extraction section After the extractant, it is in countercurrent contact with the washing liquid in the washing section, and then enters the stripping section after washing away impurities such as calcium and magnesium ions, and then enters the water phase through stripping to obtain high-purity manganese sulfate products. In the extraction-washing-extraction unit, the extraction section is 3-5, the washing section is 5-8, and the stripping section is 4-6. The extraction section, the washing section and the stripping section use steel-based fluorine-lined corrugated hoses Connect sequentially.

2. Raffinate manganese extraction-oil removal unit: Manganese material is in reverse contact with the extraction agent in the extraction section to generate raffinate, and the raffinate enters the raffinate manganese extraction centrifugal extractor, and is extracted with the saponification of the second pipeline The manganese in the raffinate enters into saponification, and the extractant generates loaded organics and residual products. The loaded organics enter the stripping section, and the stripping agent enters from the last heavy phase inlet of the stripping section, and contacts with the loaded organics in countercurrent. Produce high-purity manganese sulfate products. The extraction stages of the centrifuge for extracting manganese from the raffinate are 3‑5.

3. Extractant pickling unit: The extractant pickling unit mainly includes a pickling centrifugal extractor. The stripped extractant from the stripping section enters from the first-stage light phase inlet of the pickling centrifugal extractor, and the pickling liquid passes through the inlet of the pickling centrifugal extractor. The material pump is connected to the last heavy phase inlet of the pickling centrifugal extractor, and the two phases are contacted in countercurrent, and the empty extractant obtained is recycled. The extraction stage of the extractant pickling centrifugal extractor is 3‑5.

Prosea liquid liquid centrifugal extraction system can convert more manganese in the manganese material into high-purity manganese sulfate products, so that the manganese in the manganese material can be fully utilized, realize the deep purification of manganese, and obtain high-quality manganese that meets the battery level. Pure manganese sulfate product.