Page 40 - THE GLOBAL LEADER IN MEMBRANE SEPARATION INDUSTRY

PART 02 Proficient in membrane technology and
Case 1: Lithium extraction from natural brine
In July 2021, Yiwei Lithium Energy established a joint venture company Jinhai Lithium Industry
(Qinghai) Co., Ltd. in Qinghai with Jinkunlun Lithium Industry, a subsidiary of Dahua Chemical, to
jointly develop lithium resources in Dachaidan Salt Lake.In January 2022, Jinhai Lithium signed a
1,000-ton lithium chloride EPC contract with JIUWU HI-TECH to directly produce high-purity lithium
chloride from the natural brine of Dachaidan Salt Lake using the "adsorption + membrane method"
original halide extraction technology.
Main process
Pretreatment + Lithium Extraction by Adsorption + Membrane Purification + Evaporation Crystallization.
Technical advantages
· The third generation lithium extraction adsorbent of Jiuwu is adopted to realize the direct lithium
extraction from the original halogen；
· Organic membrane materials produced by JIUWU HI-TECH are adopted, and all key separation materials
are localized；
· The first set of domestic salt lake natural brine direct production of high purity lithium chloride, industrial
plant has a significant demonstration effect.
Jinhai Lithium Industry's annual production of 1000t/d battery grade lithium chloride
"adsorption + membrane method" natural brine lithium extraction project
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customized processes as needed
Case 2: Lithium extraction from aged brine
In 2016, JIUWU HI-TECH collaborated with Minmetals Salt Lake and the Qinghai Salt Lake
Research Institute of the Chinese Academy of Sciences to conduct research on gradient coupled
membrane method for lithium extraction from salt lakes; In 2017, an EPC contract was signed with
Minmetals Salt Lake for the 200-ton lithium carbonate project's magnesium lithium separation pilot
project; In 2018, 10000 tons of lithium carbonate were signed with Minmetals Salt Lake. The contract
for the complete set of magnesium lithium separation equipment for the project will only took 8
months to complete project construction and commissioning, achieving the offline production of
the current year's products.
Main process
Pretreatment +Membrane Integration (nanofiltration +reverse osmosis) +Electrodialysis +Lithium Precipitation
Technical advantages
·ﾠThe world's first integrated membrane salt lake lithium extraction industrialization device
directly separates magnesium and lithium from aged brine through membrane integration
process, producing qualified battery grade lithium carbonate;
· In the field of lithium extraction from salt lakes, this project has set multiple records, including the
first filling of industrial magnesium lithium separation technology, the shortest construction period
in China, and the largest scale of a single membrane device in Asia.
Minmetals Salt Lake Annual Production 10000t/a Battery Grade Lithium Carbonate Integrated membrane
Method Aged Brine Lithium Extraction Project
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