Method for selecting high-grade rare-earth concentrates step by step

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...

Examples

Embodiment Construction

[0021] The Baiyan Obo mixed rare earth concentrate with a rare earth grade of 10.86% and a particle size of -200 mesh accounting for more than 86% uses the technology of the present invention to formulate the first stage of roughing, one-time beneficiation and one-time sweeping. Rare earth medium ore is selected and 48% of the concentrated ore is swept through one sweep; the second stage is to formulate a plan for the 48% of the concentrated ore to be washed, deslimed and drug-free, followed by a roughing, a second beneficiation and a second sweeping Closed loop beneficiation process.

[0022] The amount of reagent added during flotation is calculated by weight ratio, and the specific flotation steps are:

[0023] 1) Priority flotation of some 65% rare earth concentrates

[0024] a. One-stage roughing: Raw material: low-grade mixed rare earth concentrate, put the low-grade mixed rare earth concentrate into the flotation tank, add water to mix the slurry and start stirring, so...

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...

Examples

Embodiment Construction

[0021] The Baiyan Obo mixed rare earth concentrate with a rare earth grade of 10.86% and a particle size of -200 mesh accounting for more than 86% uses the technology of the present invention to formulate the first stage of roughing, one-time beneficiation and one-time sweeping. Rare earth medium ore is selected and 48% of the concentrated ore is swept through one sweep; the second stage is to formulate a plan for the 48% of the concentrated ore to be washed, deslimed and drug-free, followed by a roughing, a second beneficiation and a second sweeping Closed loop beneficiation process.

[0022] The amount of reagent added during flotation is calculated by weight ratio, and the specific flotation steps are:

[0023] 1) Priority flotation of some 65% rare earth concentrates

[0024] a. One-stage roughing: Raw material: low-grade mixed rare earth concentrate, put the low-grade mixed rare earth concentrate into the flotation tank, add water to mix the slurry and start stirring, so...

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