Process for decomposing bactnaesite by hydrochloric acid method

A technology of bastnaesite and process methods, applied in the fields of rare earth hydrometallurgy and bastnaesite smelting, can solve problems such as operational hazards and high alkali consumption, and achieve the goals of increasing the unit yield of equipment, increasing the yield of rare earths, and reducing costs Effect

Inactive Publication Date: 2005-10-19
北京方正稀土科技研究所有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is simple and does not produce chlorine gas, but the alkali consumption is large, and the process of alkali conversion requires pressurization, which is dangerous to operate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Bastnaesite concentrate is oxidized and roasted at 1000° C. for 2 hours to obtain bastnaesite mature ore with a cerium oxidation rate of 99%.

[0024] 2) Add water to bastnaesite mature ore, stir and adjust slurry, add solid sodium hydroxide, the weight ratio of sodium hydroxide to REO in the ore is 0.15:1, heat and keep warm at 80°C for 5 hours to obtain Alkali to mine.

[0025] 3) Add water to wash the alkali and transfer the ore to pH=7-8, and the temperature of the washing water is 50°C;

[0026] 4) Heat the alkali-converted pulp that has passed the water washing to 45°C, add 20% hydrochloric acid for optimal dissolution, add the acid for 3 hours, continue stirring for 0.5 hours, and separate the solid and liquid.

[0027] 5) In the excellent solution obtained in step 4), add qualified alkali-converted ore after washing with water, add barium chloride and ammonium sulfate, stir and react for 30 minutes, and separate solid and liquid. The weight ratio of barium ...

Embodiment 2

[0034] 1) The bastnaesite concentrate is oxidized and roasted at 350°C for 6 hours to obtain the bastnaesite mature ore with a cerium oxidation rate greater than 97.5%.

[0035] 2) Add water to bastnaesite cooked ore, stir and adjust the slurry, add solid sodium hydroxide, the weight ratio of sodium hydroxide to REO in the ore is 0.45:1, heat and keep warm at 120°C for 2 hours to obtain Alkali to mine.

[0036] 3) Add water to wash the alkali and transfer the ore to pH=7-8, and the temperature of the washing water is 95°C;

[0037] 4) Heat the alkali-converted pulp that has passed the washing process to 60°C, add 20% hydrochloric acid for optimal dissolution, add the acid for 3 hours, continue stirring for 3 hours, and separate the solid and liquid.

[0038] 5) In the excellent solution obtained in step 4), add qualified alkali-converted ore after washing with water, add barium chloride and ammonium sulfate, stir and react for 30 minutes, and separate solid and liquid. The w...

Embodiment 3

[0045] 1) The bastnaesite concentrate was oxidized and roasted at 800° C. for 6 hours to obtain bastnaesite mature ore with a cerium oxidation rate of 98.5%.

[0046] 2) Add water to bastnaesite cooked ore and stir to adjust the slurry, add solid sodium hydroxide, the weight ratio of sodium hydroxide to REO in the ore is 0.5:1, heat and react at 130°C for 0.5 hours to obtain Alkali to mine.

[0047] 3) Add water to wash the alkali and transfer the ore to pH=7-8, and the temperature of the washing water is 100°C;

[0048] 4) The temperature of the alkali-to-mineral pulp that has passed the water washing is 20°C, and 10% hydrochloric acid is added for optimal dissolution. The acid addition time is 1 hour, and the stirring is continued for 4 hours to separate the solid and liquid.

[0049] 5) In the excellent solution obtained in step 4), add qualified alkali-converted ore after washing with water, add barium chloride and ammonium sulfate, stir and react for 10 minutes, and sepa...

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PUM

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Abstract

The present invention belongs to the field of wet RE metallurgical technology, and especially bastnaesite decomposing process. Bastnaesite is treated through oxidation roasting, alkali transfer and eliminating fluorine with sodium hydroxide, washing, and dissolving with hydrochloric acid to obtain RE chloride material solution with less cerium. The slag is washed, dissolved in hydrochloric acid, precipitated and baked to obtain CeO2 product with purity over 95 %. The said technological process has no waste gas produced, slag with low RE content, less waste water exhausted, environment friendship and high RE yield.

Description

technical field [0001] The invention belongs to the field of rare earth hydrometallurgy, and further description belongs to the field of bastnaesite smelting. Background technique [0002] Bastnaesite is a resource dominated by light rare earths. The current processes are mainly hydrochloric acid method and sulfuric acid method. In comparison, the sulfuric acid method has attracted widespread attention for its clean, fast, and high yield of rare earths. The hydrochloric acid method obtains a high concentration of feed liquid, and can enter the extraction system for separation and purification without transformation, which has gradually become the mainstream process of bastnaesite smelting. Since bastnaesite contains a large amount of fluorine, the sulfuric acid treatment process basically leaches fluorine and cerium into the solution. If the extraction method is used for separation, there is a risk of system emulsification. If the chemical method is used for treatment, the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00C22B3/10
CPCY02P10/20
Inventor 刘营廖春生郭晓丹王嵩龄贾江涛严纯华
Owner 北京方正稀土科技研究所有限公司
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