Lepidolite full-component utilization to achieve green manufacturing

On June 5, the "Lepidolite Full-Component Utilization Green Process and Key Technology" developed by Jiangxi Haohai Lithium Energy Technology Co.
, Ltd.
in conjunction with Nanchang University and other units passed the scientific and technological achievements evaluation organized by the China Chemical Industry Society and the expert evaluation in Beijing.
The results show that the production of calcium sulfate slag in this complete set of process is reduced by more than 90% compared with the traditional process, and the silicon slag is fully utilized, laying a technical and technological foundation for future environmental protection
.
Academician Duan Xue of the Chinese Academy of Sciences and other experts unanimously agreed that the complete process design route is advanced and reasonable, which solves the problem of comprehensive utilization of waste residues, and has obvious technological innovation, reaching the international advanced level
.
It is recommended to carry out industrial design as soon as possible to promote industrialization
.
? Expert evaluation believes that the project has carried out research on the green process and key technology of the full-component utilization of lepidolite, including: green process design for the full-component utilization of lepidolite, reaction mode, reaction process condition research, reactor structure and form, and reaction process Process safety, etc.
, formed a complete set of process technology for the full-component utilization of lepidolite
.
Using lepidolite as raw material, through the processes of acidification leaching, alkalization and dissolution of silicon, low-temperature aluminum precipitation, extraction of cesium rubidium potassium, precipitation of hydrated silica synthesis, neutralization and removal of aluminum and impurities, and concentration and extraction of lithium, the process has significantly improved The yield of each component in lepidolite
.
According to reports, the technology was listed as a science and technology project in Jiangxi Province in 2010.
The first phase invested 7.
8 million yuan in scientific research funds.
After in-depth research by nearly 20 scientific researchers, by December 2012, the document review and experimental plan formulation were completed.
, Procurement of research and development equipment, optimization of process parameters, design of production process and industrialization of 600 tons of pilot production, etc.
, and passed the project acceptance of Jiangxi Provincial Department of Science and Technology in December 2013
.
In the second stage, Jiangxi Haohai Lithium Energy Technology Co.
, Ltd.
, together with Nanchang University, Jiangxi Society of Chemistry and Chemical Engineering, and Jiangxi Jinboxin Chemical Engineering Co.
, Ltd.
, once again organized more than 30 scientific researchers, invested nearly 10 million yuan in scientific research, and implemented three classes of experimental work.
On the contrary, 24 hours a day experiment, after nearly two years of special scientific and technological research, successfully extracted all-element products from lepidolite
.
The development of new green production process technology not only fundamentally solves the environmental pollution problem of lithium carbonate waste slag produced by traditional methods, but also greatly improves the comprehensive economic value of lepidolite.
The application of this green new process technology is used in the lithium extraction industry of lepidolite Revolutionary significance of a milestone
.
? This process technology has a high comprehensive utilization rate of lepidolite, with a metal lithium recovery rate greater than 89.
38%, a metal sodium recovery rate greater than 98.
42%, a metal potassium recovery rate greater than 97.
85%, a metal cesium recovery rate greater than 80.
62%, and a metal rubidium recovery rate greater than 82.
52 %, the recovery rate of metal aluminum is greater than 68.
66%, the recovery rate of product sodium fluoride is greater than 65% (the recovery rate of calcium aluminum fluoride building materials is greater than 30%), and the recovery rate of silicon is greater than 98.
33%; the full element utilization of lepidolite resources is achieved
.
? This technology won the special prize of Yichun City Science and Technology Progress Award
.
Compared with the existing production methods for processing lepidolite, it has the obvious characteristics of high processing utilization rate, low energy consumption, obvious cost advantage, and environmental friendliness
.
? Lithium carbonate is an important chemical raw material for new energy batteries
.
Through independent innovation, this technology has mastered the production of lithium carbonate from lepidolite, and the extraction of all elements from lepidolite to produce white carbon black, aluminum hydroxide, sodium metaaluminate, potassium sulfate, cesium sulfate, rubidium sulfate, and fluoride Sodium, ammonium sulfate, sodium aluminum silicate, sodium carbonate and other ten main products, and successfully synthesized an organic extractant for efficient extraction of cesium rubidium separation, so that all the metal ions and non-metal element silicon in lepidolite can be used, and it is truly realized The comprehensive utilization of lithium carbonate extracted from lepidolite and its all-element products
.
It has greatly improved the comprehensive value of the product and is the only process technology that can truly extract all elements in lepidolite at home and abroad
.
? According to reports, the traditional processes for extracting lithium from lepidolite as raw materials mainly include salt pressure cooking, alkaline pressure cooking, and sulfuric acid.
These processes not only consume a large amount of lepidolite, but also produce a large amount of waste residue in the production.
About 40 tons of waste residues are produced per ton of lithium carbonate.
The main components of these “waste residues” are a mixture of silica and alumina, a large amount of gypsum and a small amount of silica, etc.
, which not only has a considerable amount of environmental protection treatment, but also has a low lithium yield.
The extraction reaction conditions are harsh and easily cause serious corrosion of the equipment
.
On the one hand, it greatly increases the production cost and restricts the possibility of large-scale production.
On the other hand, it causes serious environmental pollution.
In addition, due to the incomplete reaction, the leaching rate of valuable metals in lepidolite is not high, the utilization rate of raw materials is low, and the process is additional.
The value is low
.
The existing technical process of Jiangxi Haohai Lithium Energy Technology Co.
, Ltd.
fundamentally solves the above problems and can achieve green and clean production
.
? Yichun City, in the northwestern part of Jiangxi Province, contains more than 20 precious metal minerals such as lithium, tantalum, niobium, rubidium, and cesium.
It is the world’s largest lepidolite mine.
The mineable amount of lithium oxide accounts for 31% of the country’s total and the world’s 8%, enjoy the reputation of Asia's lithium capital
.
The comprehensive utilization of the research and development of lepidolite has unique advantages, which not only solves the source of lepidolite raw materials, but also saves transportation costs
.
? At present, Jiangxi Haohai Lithium Energy Company is raising funds and looking for strategic partners to start a 10,000-ton industrialization project.
It plans to build a 40,000-ton production line within two years.
The total investment is estimated to be RMB 1 billion.
The output value exceeds 10 billion yuan, and the profits and taxes exceed 6 billion yuan
.
At the same time, it effectively promotes the development of the lithium battery industry in Yichun, Jiangxi, and has considerable economic and far-reaching social benefits
.