A step-by-step method for selecting high-grade rare earth concentrates

Abstract

The invention relates to a method for selecting high-grade rare-earth concentrates step by step, belonging to the technical field of a mineral processing technology. The select flotation comprises the following two continuous steps of (1) preferably selecting part of 65 percent of rare-earth concentrates by flotation; (2) processing middlings to select 65 percent of rare-earth concentrates by flotation, wherein during the whole technological process, stage grinding is adopted to process and fine-grind the middlings to be 80 percent to 90 percent of -400 meshes, and desliming and reagent removing are performed, thereby solving the problem that the other mineral processing technology is not easy to select subsequently caused by the phenomena that gangue mineral is packed by medicaments and the like due to medicament residuals, the generated middlings is returned to the previous stage of select flotation, and finally only the high-grade mixed rare-earth concentrates such as tailings with lower rare earth grade are produced. The method provided by the invention can be utilized to continuously and stably produce the high-grade rare-earth concentrates with the rare earth grade REO (Rare Earth Oxide) being larger than or equal to 65 percent and the recovery rate being larger than or equal to 90 percent. The method is simple and efficient in process, free of pollution, and high in rare earth recovery rate, and can effectively solve the problem that the grade of the tailings in the existing rare earth beneficiation is hard to reduce.

Description

technical field [0001] The invention relates to a method for step-by-step selection of high-grade rare earth concentrate, which belongs to the field of ore dressing. Background technique [0002] Baotou is known as the "City of Rare Earths". The research on rare earth beneficiation process is also in continuous development. It has successively changed from 30% rare earth concentrate to 50% concentrate products, and now 65% rare earth concentrate has been successfully tested. The pride of being the "City of Rare Earths". [0003] However, the current research on the beneficiation process of 65% rare earth concentrates only goes through multi-stage beneficiation, and does not carry out grinding, washing, desliming, and drug removal for medium ore with coarse particle size and low mineral dissociation degree, resulting in The ore beneficiation process is long, so that the internal tailings grade remains high, and it is difficult to reduce it below 2%, and the rare earth medium...

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Problems solved by technology

[0003] However, the current research on the beneficiation process of 65% rare earth concentrates only goes through multi-stage beneficiation, and does not carry out grinding, washing, desliming, and drug removal for medium ore with coarse particle size and low mineral dissociation degree, resulting in The ore beneficiation process is long, so that the internal tailings grade remains high, and it is difficult to reduce it below 2%, and the rare earth medium ore with a grade of 45% to 55% is not reprocessed, making the gangue Minerals are also seriously wrapped in chemicals due to repeated sorting, which reduces the flotation efficiency, increases the dosage of flotation chemicals, and makes it difficult to control the flotation conditions. When producing high-grade rare earth concentrates, the recovery rate will naturally be very low. The original beneficiation process is difficult to prepare high-grade, high-recovery rare earth concentrate

[0004] Baotou is known as the "City of Rare Earths", but the current research on the beneficiation process of 65% rare earth concentrates is only through three or more stages of fine and sweeping beneficiation. Grinding the low-grade roughing tailings, without washing, desliming, and drug-removing treatment of the concentrated ore, resulting in a long mineral processing process, the tailings grade remains high, and it is difficult to reduce it to below 2%. Moreover, after multi-stage separation, the surface of the minerals is covered by chemicals, resulting in similar surface properties of gangue minerals and target minerals, resulting in low flotation efficiency and increased flotation drug dosage, making it difficult to control flotation conditions. When producing high-grade rare earth concentrates, the recovery rate will naturally be very low, making it difficult to produce high-grade, high-recovery rare earth concentrates through the original beneficiation process

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