Bauxite ore dressing started in the 1970s and was originally developed by the Central South University of Technology and the Beijing Research Institute of Mining and Metallurgy. Because of the limitations of research methods, at that time, everyone just looked at the monomer dissociation of minerals, although the laboratory completed the recovery rate of 93%, the yield of 90%, the selection of concentrate a / s reached 13 or more impressive results However, the obtained concentrate has a finer particle size, and the -200# is about 97%. Such a fine concentrate particle size makes the grinding cost higher, and the concentrate dehydration work after beneficiation becomes difficult to perform, so it cannot be truly applied. Industrial production.
Until the mid-1990s, with the deepening of mineral structure research, the concept of aluminum-rich continuous body in bauxite was put forward, and the ore dressing work really came out of the research room. Based on the research results of the Beijing Research Institute of Mining and Metallurgy and Central South University of Technology, the Chinalco Henan Branch conducted a positive flotation industrial test at the Xiaoguan Aluminum Mine in 1999. A64% (a/s is 6.4) of ore passed through After flotation, the selected concentrate reached a70% (a/s was 14), the alumina recovery rate was 87%, the tailings a/s was stable at 1.5, and the concentrate size was broken, reaching -200# less than At the level of 75%, the concentrate water after the selection is 10%.
In 2001, China Great Wall Aluminum Co., Ltd. Zhongzhou Aluminum Plant and Beijing Research Institute of Mining and Metallurgy, Central South University and other units used Henan Bauxite Mine to conduct further positive flotation industrial tests. When using ore similar to 1999 ore. The same effect as in 1999 was achieved; when the raw ore a54% (a/s was 3.5) was used, the concentrate reached a65% (a/s was 8) and the tailings a/s was 1.2. The fineness and moisture of the concentrate are kept at the original level. This test not only verified the conclusions of 1999, but also made new breakthroughs in the process flow.
China's bauxite has the characteristics of high alumina content. If the Bayer process is used, even under the same conditions of ore a/s, even the diaspore, through the optimization of the Bayer process, the cost of alumina production is completely Can be in line with foreign countries. The reverse flotation of low a/s ore also lays a foundation for the sintering method to improve the a/s of grinding ore and reduce the difficulty of desiliconization of the crude liquid in the sintering process.
Basal theory and application technology of bauxite flotation desiliconization established the system of medium-grade bauxite flotation separation theory, the first anti-flotation desiliconization-pipeline preheating residence dissolution production of alumina technology, making China 80% Medium and low grade bauxite becomes a high grade concentrate. The formation of desiliconization technology of bauxite mine solves the problem of low grade and insufficient resources of bauxite resources, especially northern bauxite resources in China. It is mainly used in oxidized ore beneficiation, especially bauxite ore dressing, the effect is very obvious, and the prospect is very promising. Through the progress of mineral processing, the problem of ore resources that plague the alumina industry in China can be fundamentally solved.
Zhongzhou Aluminum Plant Bauxite Desiliconization Flotation Agent Series 2004 was successful. The project has reached the design index requirement from the recovery rate to the concentrate grade, and has been applied in the high-tech industrialization demonstration project of alumina production by the 300,000-ton beneficiation Bayer process of China Aluminum Corporation Zhongzhou Branch. This indicates that China's alumina ore flotation technology has been industrialized.
The grade of bauxite reserves in northern China can not meet the production of alumina, and the bauxite resources will be exhausted. The poor ore flotation comes into being. Through physical and chemical methods, low-grade lean ore is selected to produce relatively high-grade ore, thereby increasing the ratio of aluminum to silicon, which has become the subject of scientific and technological personnel. Since the beginning of March 2003, China Aluminum Corporation Zhongzhou Aluminum Plant and Central South University have joined forces to develop a bauxite desiliconization float for the alumina demonstration project in China, the 300,000 tons/year beneficiation Bayer process project of Zhongzhou Branch. Selection series.
Researchers develop their own process, formulate production plans, design and construction drawings without any data and experience. After thousands of calculations and tests, after more than a year of hard work, the company "marriage" End the fruit. At present, the flotation series they developed includes collectors , dispersants, inhibitors, foaming agents, concentrate filtration aids and sedimentation separation flocculants. This series of pesticides is 300,000 tons of China's alumina demonstration project Zhongzhou Branch. The only applicable mineral processing agent for the Bayering Project in the Year. It has been successfully applied to the 300,000 tons/year beneficiation project of Zhongzhou Aluminum Plant. The index is stable and economical, and it meets the production needs of the 300,000 tons/year Beneficiation project.
The formation of desiliconization technology of bauxite mine solves the problem of low grade and insufficient resources of bauxite resources, especially northern bauxite resources in China. It is mainly used in oxidizing ore dressing collectors, especially bauxite ore dressing, the effect is very obvious, and the prospect is very promising.
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