Bastnaesite (bastnasite) separation method

Abstract

The invention relates to nonferrous metal rare earth separation, concretely relates to a method for separating lanthanum-enriched rare earth chloride, cerium fluoride and cerium oxyfluoride by bastnaesite and bastnasite hydrochloride. The method comprises the following steps: A, oxidizing and roasting bastnaesite and bastnasite at low temperature; B, dissolving out the oxidized and roasted concentrate at low temperature by hydrochloric acid; C, filtering and separating slag and liquid after dissolving out; D, separating cerium fluoride and fluoride ceria during the process of separating slag. The bastnaesite (bastnasite) separation method of the invention has the advantages that zero discharge of waste water is realized, the cost is reduced, product value is increased, the process flow is minimized and the labor intensity is reduced.

Description

[0001] 1. Field: [0002] Rare earth separation of non-ferrous metals, bastnaesite rare earth and bastnaesite lanthanum separation method. 2. Background technology: [0003] At present, the method steps of bastnaesite widely used in the industry to separate cerium-poor rare earth chlorides are: oxidation roasting, first-time optimal dissolution, filtration, filter residue alkali transfer, 10-12 times of water washing, filtration, second-time optimal dissolution, filtration, three-time optimization Dissolve and filter. 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 enviro...

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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