Hamartite smelting separation process

A bastnaesite and process technology, applied in the field of bastnaesite smelting and separation, to achieve the effects of simple process flow, green process and improved recovery rate

Active Publication Date: 2011-08-10
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at various problems existing at present, and improves and innovates the existing oxidative roasting-hydrochloric acid excellent dissolving process

Method used

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  • Hamartite smelting separation process
  • Hamartite smelting separation process
  • Hamartite smelting separation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Bastnaesite is leached with hydrochloric acid through oxidative roasting to obtain a high-quality slag 1 ton, wherein REO content is 30wt%, CeO 2 / TREO is 60%, the weight content of fluorine is 3.0wt%, ThO 2 The content is 0.1 wt%. Be that the sulfuric acid solution of 2 washes with pH, ​​the chloride ion content in the excellent slag after washing is 0.01%, then at room temperature, be 12: 1 (weight ratio) with the sulfuric acid of 0.5mol / L with liquid-solid ratio, to A fine slag was leached for 10 hours, the rare earth leaching rate was 93%, and the obtained sulfuric acid rare earth solution was 14.4m 3 , wherein the rare earth content is 19.4g / L in terms of REO, of which CeO 2 / TREO is 85%, F - The concentration is 1.9g / L, ThO 2 It is 0.03g / L.

[0035] Rare earth sulfate solution using P 507 and P 204 The synergistic extractant is carried out in accordance with the ratio of 1.5:1 for 5-stage countercurrent extraction, extracting cerium (IV), thorium (IV), and ...

Embodiment 2

[0039] Bastnaesite is leached with hydrochloric acid through oxidative roasting to obtain 1 ton of excellent slag, wherein REO content is 75wt%, CeO 2 / TREO is 85%, fluorine content is 10wt%, ThO 2 Content is 0.8wt%, is 4 sulfuric acid solution with pH, ​​washes, and the chloride ion content in the excellent slag after washing is 0.1%, then under 80 degree, is 5.5 with the sulfuric acid of 4mol / L with liquid-solid ratio: 1 (weight ratio) leaching a high-quality slag, leaching for 1 hour, filtering, washing the filter cake with water, the leaching rate of rare earth is 95%, and the rare earth content in the rare earth sulfate solution obtained is 108g / L in terms of REO, wherein CeO 2 / TREO is 80%, F - The concentration is 14.4g / L, ThO 2 The concentration is 1.15g / L.

[0040] The obtained sulfuric acid rare earth solution adopts P 507 and P 204 The synergistic extractant is subjected to 10-stage countercurrent extraction according to the ratio of 8:1, cerium (IV), thorium (...

Embodiment 3

[0044] Bastnaesite is leached with hydrochloric acid through oxidative roasting to obtain a high-quality slag 1 ton, wherein REO content is 40wt%, CeO 2 / TREO is 85%, fluorine content is 4.5wt%, ThO 2 Content is 0.3wt%, with the sulfuric acid solution that pH is 2, wash, and the chloride ion content in the slag after washing is 0.01%, then under 100 ℃, with the sulfuric acid of 6.0mol / L, liquid-solid ratio is 2 : 1 (weight ratio) leaching a fine slag, leaching 2 hours, filtering, water washing filter cake, the leaching rate of rare earth is 95%, and rare earth content in the sulfuric acid rare earth solution obtained is 158g / L with REO, wherein CeO 2 / TREO is 85%, F - The concentration is 17.8g / L, ThO 2 The concentration is 1.19g / L.

[0045] Rare earth sulfate solution using P 507 Carry out 6-stage countercurrent extraction according to the ratio of 12:1, cerium (IV), thorium (IV), fluorine and iron are extracted into the organic phase, and the trivalent rare earths are le...

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Abstract

The invention discloses a hamartite smelting separation process. First optimal slag or/and second optimal slag mainly containing cerium (IV), thorium (IV) and fluorine, obtained by oxidative roasted salt acid leaching of hamartite, is/are used as raw materials, and extraction and separation of rare earth are performed. The process comprises the following steps of: 1) leaching the first optimal slag by using sulfuric acid to obtain sulfuric acid-rare earth solution and filter residue; or leaching the second optimal slag obtained by alkali conversion-hydrochloric acid dissolution of the first optimal slag by using sulfuric acid to obtain sulfuric acid-rare earth solution and filter residue; or leaching the mixed slag of the first optimal slag and the second optimal slag by using sulfuric acid to obtain sulfuric acid-rare earth solution and filter residue; 2) performing extraction separation on the sulfuric acid-rare earth solution obtained in the step 1) to obtain a rare earth compound,fluorine washing liquor, a pure cerium product and a thorium product; and 3) synthesizing a fluoride product by using the fluorine-containing alkali wastewater obtained by alkali conversion in the step 1) and the fluorine washing liquor obtained by the extraction separation in the step 2). The process has the advantages that: the recovery rate of the rare earth is obviously improved, the fluorineand the thorium (IV) are effectively reclaimed in a product form, the high-purity cerium product is obtained, reclamation of the rare earth and associated resources is realized, and the additional values of the resources are improved; and the process flow is simple, the consumption of acid and alkali is low, the production cost is low, and the process is environmentally-friendly.

Description

technical field [0001] The invention relates to a process method for smelting and separating bastnaesite. Specifically, the primary slag or / and the secondary slag obtained after bastnaesite oxidation roasting-hydrochloric acid dissolution are used as raw materials to carry out rare earth, thorium (IV ) extraction and separation, the rare earths, thorium (IV) and fluorine in the bastnaesite are all recovered in the form of products. The invention belongs to the field of rare earth hydrometallurgy. Background technique [0002] Bastnaesite is the second largest rare earth resource in my country. At present, the raw ore is generally subjected to gravity separation, flotation or magnetic separation in industry to obtain a rare earth concentrate with a rare earth content of 50% to 70%. The concentrate is oxidized and roasted, and the fluorocarbonic acid Rare earth is decomposed into oxidized rare earth or fluorine oxidized rare earth, cerium is oxidized into tetravalent, trivalen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/04C22B3/26C22B59/00C01B9/08
CPCY02P10/20
Inventor 黄小卫崔大立龙志奇张永奇王春梅于瀛赵娜李红卫刘营王良士
Owner GRIREM ADVANCED MATERIALS CO LTD
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