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A method for producing rare earth fluoride from bastnaesite

A technology of biscarbonate lanthanum and rare earth fluoride, which is applied in the field of rare earth production and can solve problems such as high cost, time-consuming, and non-environmental protection

Active Publication Date: 2019-02-22
SICHUAN PROVINCE LESHAN CITY RUIFENG METALLURGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: how to provide a method for producing rare earth fluoride from bastnaesite ore, and solve the problems of high cost, time-consuming, and non-environmental protection caused by the need for additional fluorinating agents in the production of rare earth fluoride

Method used

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  • A method for producing rare earth fluoride from bastnaesite
  • A method for producing rare earth fluoride from bastnaesite
  • A method for producing rare earth fluoride from bastnaesite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] a. Decarburize and oxidize Sichuan Mianning magnetic separation ore in a muffle furnace at 500°C for 1 hour. The burnt rare earth oxide ore is ready for use. After testing, REO: 84.5%, F: 8.98%.

[0023] b. Add 700 mL of clear water to a 2000 mL beaker, add 31% industrial hydrochloric acid to prepare a hydrochloric acid solution with a concentration of 3.60 mol / L, and add 10 mL of complexing agent.

[0024] c. Add 200g of rare earth oxidized ore to be used while stirring, and continue to react for 1 hour after adding the rare earth oxidized ore, and the whole process lasts for 1.5 hours.

[0025] d. After the reaction, add 2mL of flocculant for solid-liquid separation, and obtain fluorine-containing rare earth feed liquid and a small part of leaching residue. The fluorine-containing rare earth liquid enters the next step, and the leaching residue is washed to recover rare earth. After drying, the leaching residue weighs 37g , which contains REO: 15.50%, and the rare ear...

Embodiment 2

[0030] a. Decarbonize and oxidize Sichuan Mianning flotation ore in a muffle furnace at 520°C for 1.5 hours. The burned rare earth oxide ore is ready for use. After testing, REO=77.80%, F=8.30%.

[0031] b. Add 700mL of clear water to a 2000mL beaker, add 31% industrial hydrochloric acid to prepare a hydrochloric acid solution with a concentration of 3.50mol / L, and add 8mL of complexing agent.

[0032] c. Add 200g of rare earth oxidized ore to be used while stirring, and continue to react for 1 hour after adding the rare earth oxidized ore, and the whole process lasts for 1.5 hours.

[0033] d. After the reaction, add 2mL of flocculant for solid-liquid separation, and obtain fluorine-containing rare earth feed liquid and a small part of leached slag. The fluorine-containing rare earth liquid enters the next step, and the leached slag is washed to recover rare earth. After drying, the leached slag weighs 58g , which contains REO=13.41%, and the rare earth leaching rate is 95.90...

Embodiment 3

[0038] a. The Sichuan Dechang flotation ore was decarburized and oxidized by burning in a muffle furnace at 480°C for 1 hour, and the burnt rare earth oxide ore was ready for use. After testing, REO=70.53%, F=7.55%.

[0039] b. Add 700mL of clear water to a 2000mL beaker, add 31% industrial hydrochloric acid to prepare a hydrochloric acid solution with a concentration of 3.30mol / L, and add 5mL of complexing agent.

[0040] c. Add 200g of rare earth oxidized ore to be used while stirring, and continue to react for 1 hour after adding the rare earth oxidized ore, and the whole process lasts for 1.5 hours.

[0041] d. After the reaction, add 2mL flocculant for solid-liquid separation, and obtain fluorine-containing rare earth feed liquid and a small part of leaching residue. The fluorine-containing rare earth liquid enters the next step, and the leaching residue is washed to recover rare earth. After drying, the leaching residue weighs 77g , which contains REO=10.06%, and the rar...

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Abstract

The invention discloses a method for producing rare earth fluoride from bastnasite. The method comprises the following steps that 1, bastnasite is burnt, decarburized and oxidized; 2, the burnt, decarburized and oxidized bastnasite is added into a hydrochloric acid water solution with a complexing agent for acid leaching; 3, after acid leaching, a flocculating agent is added for solid-liquid separation, a fluorine-containing rare earth material and leached residue are obtained, and the leached residue is washed and recycled; 4, the fluorine-containing rare earth material is heated to be boiled and kept warm, standing is carried out after the reaction is finished, solid-liquid separation is carried out after clarification, and a fluorinated rare earth solid phase and a rare earth chloride clear liquid phase are obtained; and 5, the fluorinated rare earth solid phase is washed till pH is 6-7, heating and dehydration are carried out after filtration, and therefore rare earth fluoride is obtained. Rare earth ore is decomposed, the rare earth fluoride product is obtained, the leaching rate of rare earth in the rare earth ore is larger than 94%, and the utilization rate of fluorine resources in rare earth ore is larger than 91%. Fluorine resources in rare earth ore concentrate are sufficiently utilized, rare earth fluoride is produced, and a remarkable effect is obtained in the aspects of cost, energy saving and consumption reducing, environmental protection and the like.

Description

technical field [0001] The invention belongs to the field of rare earth production, and in particular relates to a method for producing rare earth fluoride from bastnaesite. Background technique [0002] Rare earth fluoride is widely used in rare earth metal electrolysis, rare earth polishing powder fluorine additive, arc carbon rod, electrode flux, special alloy, steel casting and other fields. In the production process of rare earth fluoride, the traditional method is to decompose and separate rare earth ore to generate corresponding rare earth chloride, rare earth carbonate or other rare earth salts and oxides, and use the above materials as raw materials for fluorination. There are wet and dry processes for fluorination. The wet process uses hydrofluoric acid to fully react with rare earth chloride, rare earth carbonate or other rare earth salts to synthesize rare earth fluoride. The rare earth fluoride produced by this process is colloidal and has a volume Large, diffi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B59/00C22B3/10
CPCC22B3/10C22B59/00Y02P10/20
Inventor 吴仕伦朱光荣张亚兵张荣冯新瑞
Owner SICHUAN PROVINCE LESHAN CITY RUIFENG METALLURGY CO LTD
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