Tailings slag changed precious raw materials, another breakthrough in China Minmetals' technology

Recently, China Minmetals' Changsha Research Institute of Mining and Metallurgy, "Complicated associated fluorite low-temperature and efficient flotation technology" passed the enterprise acceptance, which means that the world's problem - complex associated fluorite comprehensive recycling technology has made a major breakthrough in Hunan Province, more tails slag will become valuable fluorine chemical raw material, widely used in important areas of metallurgy, building materials, medicine and chemical industry, new energy industries.

Recently, China Minmetals' Changsha Research Institute of Mining and Metallurgy, "Complicated associated fluorite low-temperature and efficient flotation technology" passed the enterprise acceptance, which means that the world's problem - complex associated fluorite comprehensive recycling technology has made a major breakthrough in Hunan Province, more tails The slag will become a precious fluorine chemical raw material, which is widely used in important fields such as metallurgy, building materials, pharmaceutical and chemical industry, and new energy industry.

Hunan Zhuzhou Persimmon Garden is a rare organic non-ferrous metal enrichment area in the world. It is known as the “World Nonferrous Metals Museum”. The associated fluorite resource reserves are nearly 100 million tons, accounting for 70% of the total associated fluorite in the country. The value is as high as 220 billion yuan.

After the pre-multi-metal beneficiation , the tailings contain a large amount of unrecovered fluorite resources, but there are characteristics and defects of low “one low, one high and one large” with low main grade, high impurity content and large metallurgical residual chemical interference. Recycling has become a recognized problem in the industry and has been included in the national five-year plan for scientific and technological research.

In order to make full use of the fluorite resources of the Shizhuyuan tailings, Hunan Nonferrous has established Hunan Nonferrous Luzhou Fluorine Chemical Co., Ltd. (currently affiliated to China Minmetals), but limited by technology, the grade of fluorite concentrate has only reached 88% in recent years. The recovery rate is about 45%, which is difficult to meet the requirements of chemical grade industrial applications.

The Changsha Research Institute of Mining and Metallurgy affiliated to China Minmetals has started the research work on the integrated recovery technology of associated fluorite. After five years of research, it has formed a complete set of complex associated fluorite recovery technology: changing the singularity of traditional process on gangue suppression, based on fluorite Different flotation separation range different from gangue, original step-by-step inhibition process, improve fluorite concentrate grade; develop new stripping technology to improve fluorite surface properties, enhance its floatability, improve recovery rate; innovative pharmacy, solve routine The fluorite flotation agent is resistant to low temperature and poor acid and alkali resistance, which makes the fluorite recovery effect unstable.

In August 2016, Cangzhou Fluorine Chemical Co., Ltd. launched an industrial test on “Cryogenic High-efficiency Flotation Technology for Complicated Associated Fluorite”. The quality and output of fluorite concentrate were doubled. At present, the concentrate grade can reach over 93%. The rate can reach more than 70%, ranking the world's leading level.

The person in charge of Zhangzhou Fluorine Chemical Co., Ltd. said: "This technological breakthrough provides raw material guarantee for the production of downstream products. It is expected that the company will produce 43,000 tons of anhydrous hydrogen fluoride and 40,000 tons of fluorite pellets throughout the year. recording!

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