Alumina Mine Reverse Flotation Desilication Production Alumina New Process Industrial Test

More than 80% of China's bauxite is A/S5-8 low-grade diaspore-type bauxite, and it is not possible to simply use the low-energy Bayer process to produce alumina.

Bauxite ore flotation and desilication Production of alumina The new technology test is based on the content of the main minerals in the ore, and the lesser content of silicon-containing gangue minerals is floated out, leaving the concentrate in the flotation cell. Compared with positive flotation desilication technology, the advantages are: less flotation and more suppression, more rational technological principles; flotation of silicon-containing minerals can avoid collectors, etc. into the concentrate, thereby reducing or avoiding the accumulation of organic compounds in the Bayer process. Easy to remove silicon-containing minerals such as pyrophyllite and reduce the rate of crusting on preheated pipes; the concentrate has good dewatering performance and low moisture content.

Industrial trials have developed control of slurry dispersion and desliming techniques; establishment of structures and performance relationships for flotation agents that enhance the capture of aluminosilicate minerals and selective inhibition of diaspore; reveal major aluminosilicate minerals and cations Mechanisms of collectors in mineral interface interactions and flotation behaviors; Development of desilication efficient collectors, inhibitors, and foamers with low dosage, selective to silica minerals, and the establishment of a systemic antifloatation agent System and desiliconization process flow; control of selective and selective desliming; and the formation of a “bauxite selective desliming-cationic reverse flotation desilication” technology with China’s independent intellectual property rights, pioneering the reverse flotation of bauxite Desiliconization - Pipelined preheated dwelling to produce new alumina process.

The test results show that after the bauxite with a ratio of aluminum to silicon of 5.88, after reverse flotation, the aluminum-to-silica ratio of the concentrate is 10.12, and the alumina recovery rate is 82.40%. The concentrate is treated with the Bayer process, the pre-silicon removal rate reaches 43%, the dissolution of the concentrate, the red mud settling compression performance is good, the speed of the pipe crusting is low, and the alumina product quality is good.

The successful development of this new technology has enriched the principle of the utilization of low-grade diaspore-type bauxite resources in China.