Clean separation method for bastnaesite (bastnasite)

Abstract

The present invention relates to nonferrous metal and rare earth separation, specifically to a method for clean separation of lanthanum-rich rare earth chloride, cerium fluoride and cerium fluoride oxide from bastnaesite and bastnasite. The method comprises the following steps: A, baking rare earth concentrate while adding an active agent; B, carrying out hydrochloric acid dissolution for the baked concentrate added with the active agent; C, after the hydrochloric acid dissolution treatment, filtering and separating the residue and the liquid; D, separating the cerium fluoride and the cerium fluoride oxide during the residue separation process. According to the present invention, purposes of zero discharge of waste water, reduction of cost, improvement of product value, reduction of the technological process, and reduction of labor intensity can be achieved.

Description

[0001] 1. The field it belongs to: [0002] Separation of non-ferrous metal rare earth, clean separation method of bastnaestite and bastnaestite. 2. Background technology: [0003] At present, bastnaesite is widely used in the industry to separate cerium-less rare earth chloride with the following steps: oxidative roasting, primary dissolution, filtration, alkali transfer of filter residue, 10-12 times of water washing, filtration, secondary dissolution, filtration, and tertiary dissolution. Dissolve and filter. The current process has the following problems and deficiencies: the ore after roasting has undergone many times of excellent dissolution, alkali transfer, water washing and filtration, and the process flow is long: due to the repeated handling of materials in the long process, the labor intensity is high; the filter residue needs to be washed after alkali transfer, and after washing A large amount of fluorine-containing reduced wastewater is produced, which seriously...

AI Technical Summary

Problems solved by technology

The current process has the following problems and deficiencies: the roasted ore has undergone many times of optimal dissolution, alkali conversion, water washing, and filtration, and the process is long: due to the long process and repeated handling of materials, the labor intensity is high; the filter residue needs to be washed after alkali conversion. A large amount of fluorine-containing subtractive wastewater is produced, which seriously pollutes the environment, and the treatment cost is high and difficult; the current process has low utilization efficiency of equipment; alkali conversion needs to consume 0.28 tons of sodium hydroxide per ton ore, alkali The conversion cycle is 8-12 hours, and the alkali conversion equipment has been running for 24 hours to maintain a temperature of 100-120 degrees, which consumes a lot of electricity and steam. The alkali cake after alkali conversion needs a lot of water and flocculant to wash the alkali cake, which is costly and original Direct emission of fluorine to generate cerium fluoride is a product demanded by the market

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