Method for producing rare earth ferro-silicon raw material with fluorine containing alkali waste water

A technology of rare earth ferrosilicon and waste alkaline water, which is applied in the direction of improving process efficiency, etc., and can solve the problems of a large number of sites, inability to treat alkali-transformed wastewater, and small processing capacity

Active Publication Date: 2008-12-03
CHINA MINMETALS BEIJING RES INST OF RE
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AI Technical Summary

Problems solved by technology

The second method is first acid-dissolving and then alkali-transforming. For example, the method in the Chinese invention patent with the publication number CN1683569 A is that bastnaesite is oxidized and roasted and then dissolved with hydrochloric acid. The slag after fluorine is acid-soluble again, and by controlling the addition conditions of hydrochloric acid, the cerium-rich lanthanum feed solution and 95% cerium oxide product can be obtained respectively; Water washing to remove fluorine, but the conditions are simple, and finally only a primary product of mixed rare earth chloride is obtained
[0009] 1. Recovering alkali by electrolysis: as introduced in patents CN1715199A and CN1554591A, but alkali conversion wastewater contains a large amou

Method used

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Examples

Experimental program
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Example Embodiment

[0029] Example one:

[0030] Add (LaCe)Cl to 1T acid leaching residue (containing REO70%) 3 Solution, 500KG by REO, add 3m 3 Alkali-to-wastewater, containing OH - 1mol / L, F - 1.1mol / L, add ammonia to pH9. After liquid separation, the liquid contains F - 4mg / L, can be discharged directly. After washing, the slag is transferred to 500, which can be used for the production of rare earth ferrosilicon.

Example Embodiment

[0031] Example two:

[0032] Add LaCl to 1T acid leaching residue (containing REO70%) 3 Solution, 100KG by REO, add 0.5m 3 Alkali-to-wastewater, containing OH - 1.3mol / L, F - 0.9mol / L, add ammonium bicarbonate to pH8. After liquid separation, the liquid contains F - 5mg / L, can be discharged directly. After washing, the slag is at a temperature of 300, which can be used for the production of rare earth ferrosilicon.

Example Embodiment

[0033] Example three:

[0034] Add (LaCe)Cl to 1T acid leaching residue (containing REO65%) 3Solution, 450KG in terms of REO, then add CaCl 2 solution, CaO10Kg, add 3m 3 Alkali-to-wastewater, containing OH - 1mol / L, F - 1.1mol / L, add NaOH to pH9. After liquid separation, the liquid contains F - 5mg / L, can be discharged directly. After washing, the slag is transferred to 500 ℃, which can be used for the production of rare earth ferrosilicon.

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Abstract

The invention relates to a wastewater treatment method during the rare-earth hydrometallurgy process, which obtains products that can be used as the material for smelting rare-earth silicoferrite. The method comprises the steps as follows: the rare-earth is acid-dipped, the slurry is stirred and mixed after being added with water; salt solution containing metal ions is added; fluorine-containing waste alkaline water is added in the mixture to form fluoride and hydroxide precipitate, and the addition amount is controlled according to the precipitated metal ion amount that is 10wt percent to 95wt percent; other precipitators are added in sequentially to precipitate the metal ions fully; water is added for washing until the pH value ranges from 7 to 8; solid is dried and dewatered at the temperature that ranges form 110 to 600 DEG C after solid-liquid separation; products can be used as the material for smelting the rare-earth silicoferrite after dehydration. In the waste water discharged in wastewater treatment method, the content of fluorine ion is less than 10mg/L, the pH value ranges from 8 to 9, and the waste water is neutral.

Description

Technical field [0001] The present invention relates to a method for treating wastewater in the rare earth hydrometallurgical process, and the product obtained by this treatment method can be used as a raw material for rare earth ferrosilicon. Specifically, it relates to a method for preparing rare earth ferrosilicon raw materials from fluorine-containing waste alkali water. method. Background technique [0002] Bastnaesite is a resource dominated by light rare earths. Its rare earth reserves are second only to Baotou Bayan Obo and the Mountain Pass Mine in the United States. It is the third largest rare earth resource in the world. Its development and application play a vital role in the application of rare earths and the economic development of western my country. [0003] For the decomposition method of bastnasite, the hydrochloric acid method is currently the most widely used, and the sulfuric acid method is rarely used. There are many literature reports on the specifi...

Claims

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Application Information

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IPC IPC(8): C22B3/06C22B3/46C22B3/22
CPCY02P10/20
Inventor 廖春生
Owner CHINA MINMETALS BEIJING RES INST OF RE
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