Method for leaching rare earth in rare earth-containing porcelain clay ore raw ore

Abstract

The invention provides a method for leaching rare earth in rare earth-containing porcelain clay ore raw ore. The method comprises the following steps of leaching associated rare earth in the rare earth-containing porcelain clay ore raw ore by using a magnesium salt solution, sequentially adding magnesium salt solid into primary slurry and secondary slurry, performing stirring and leaching, washinghigh-alumina sand by using clear water, enabling the leaching rate of the rare earth to be up to 90% or above, enabling the leaching rate of aluminum to be lower than 0.2%, carrying out non-saponification and non-equilibrium coupling centrifugal extraction and centrifugal reverse extraction on a rare earth-containing solution, and then circularly returning raffinate to stir and leach the rare earth-containing porcelain clay ore raw ore, thereby further lowering the leaching rate of the aluminum and finally improving the quality of a final high-aluminum porcelain clay product.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of raw ores of china clay ores containing rare earths, in particular to a method for leaching rare earths from raw ores of china clays containing rare earths. Background technique [0002] China is rich in porcelain clay ore resources, with a total of 1.43 billion tons of ore reserves, ranking seventh in the world. According to different types of deposits, china clay deposits can be divided into three types: weathering crust type, hydrothermal alteration type and sedimentary type. Among them, the weathering crust type deposit is the most important, often associated with ionic rare earths, and the rare earth grade is 0.02% to 0.05%. The consumption of china clay in the world is mainly concentrated in the fields of papermaking, ceramics, paint and plastics. About 80% of China's porcelain clay products are used in low-end industries such as ceramics, while most of the high-whiteness papermak...

AI Technical Summary

Problems solved by technology

[0008] In view of the fact that there is no special research on the recovery and utilization of rare earth resources in the original ore containing rare earth china clay ore using inorganic salt leaching agent to leach rare earth, and the ammonia nitrogen pollution in the ammonium sulfate leaching process used for ionic rare earth ore, The low yield of rare earth and the lower quality of high-alumina china clay products, etc., the purpose of the present invention is to provide a new technology for recovering associated rare earth and high-alumina china clay products from raw ore containing rare earth china clay, without affecting the quality of the final high-alumina china clay products Under the premise of realizing the efficient and clean recycling of associated rare earths, so as to realize the high-value utilization of raw ore containing rare earth china clay, and promote the green development of China's china clay industry

Images