Technique for decomposing Baotou rare-earth ores

Abstract

The invention relates to a technique for decomposing Baotou rare-earth ores. The invention solves the technical problems of environmental pollution and resource loss caused by the rare-earth ore separation technique in the prior art. The technique comprises the following steps: carrying out oxidizing roasting on mixed rare-earth concentrate; leaching the roasted ores with an H2SO4 solution to obtain a leach solution and urdite; extracting and separating Ce (IV), F and Th as well as single RE (III) from the sulfuric acid leach solution; and carrying out alkali conversion on the urdite to obtain a rare-earth alkali cake, carrying out size mixing, filtering, and crystallizing the alkaline solution to recover sodium phosphate, wherein the residual alkali liquor is used for cyclically leaching urdite slag. When being used for treating the mixed rare-earth concentrate, the technique provided by the invention can implement multi-step extraction of bastnaesite and urdite in the mixed ores. Besides, the invention is beneficial to further effectively recovering Th, F and P from baotite, thereby avoiding environmental pollution, enhancing the rare-earth yield, saving the cost and implementing clean production and comprehensive resource utilization in deed.

Description

technical field

[0001] The invention relates to the field of hydrometallurgy, in particular to a process method for decomposing Baotou rare earth ore. Background technique

[0002] Rare earth resources are widely used in military, metallurgy, petrochemical, glass ceramics, new materials, agriculture, etc. Especially in high-tech fields such as information, biology, energy technology and national defense construction, it has important uses. my country is the country with the largest reserves of rare earth resources, accounting for more than 30% of the world's total. Among them, Baotou rare earth ore accounts for more than 90% of my country's total reserves, and it is a mixed rare earth ore resource containing monazite and bastnaesite. Because of its complex mineral structure and composition, it is recognized as a difficult-to-smelt mineral in the world. Therefore, it is very important to further develop and study the smelting and separation process of rare earth ores. [...

Examples

Embodiment 1

[0038] Take 500g of Baotou rare earth mixed ore and roast it in a muffle furnace at 400°C for 2h. Baotou rare earth mixed roasting mine with 2.5M H 2 SO 4The solution was leached at 80°C for 30 minutes and then filtered to obtain Th-acid-containing leach solution and filter cake (monazite). The REO content in the leachate is 60g / L. Add 40wt% NaOH solution to the filter cake and react at 150°C for 3h. After the reaction, use hot water at 80°C to slurry, filter, and wash for 1 to 2 times to obtain an alkali-containing solution and a rare-earth alkali cake. When leaching with sulfuric acid solution, the leaching rate of REO reaches 66%, and the Ce:F in the obtained leaching solution is about 1:1 (mol), wherein the concentration of REO is 50.67g / L, and the concentration of F is 3.76g / L. The obtained filter cake (monazite) REO content is 44.18%, F content is 8.12%. In the alkali conversion process with NaOH solution, about 99.81% of REO remained in the rare earth alkali cake, ...

Embodiment 2

[0040] Take 500g of Baotou rare earth mixed ore and roast it in a muffle furnace at 450°C for 2h. 2M H ​​for Baotou Rare Earth Mixed Roasting Mine 2 SO 4 The solution was leached at 80°C for 60 minutes and then filtered to obtain Th-acid-containing leachate and filter cake (monazite). The REO content in the leachate is 57g / L. Add 50wt% NaOH solution to the filter cake and react at 180°C for 3h. After the reaction, the slurry is mixed with hot water and filtered, and then the filter cake is washed with water for 1 to 2 times to obtain an alkali-containing solution and a rare earth alkali cake. When leaching with sulfuric acid solution, the leaching rate of REO reaches 64.84%, and the Ce:F in the obtained leaching solution is about 1:1 (mol), wherein the concentration of REO is 52.46g / L, and the concentration of F is 3.85g / L. The obtained filter cake (monazite) REO content is 42.12%, F content is 7.54%. In the alkali conversion process with NaOH solution, about 98.95% of RE...

Embodiment 3

[0042] Take 500g of Baotou rare earth mixed ore and roast it in a muffle furnace at 300°C for 6h. Baotou rare earth mixed roasting mine with 3M H 2 SO 4 The solution was leached at 100°C for 12 minutes and then filtered to obtain Th-acid-containing leachate and filter cake (monazite). The REO content in the leachate is 60g / L. Add 50wt% NaOH solution to the filter cake and react at 150°C for 5h. After the reaction, the hot water at 80°C is slurried and filtered, and then the filter cake is washed with water for 1 to 2 times to obtain an alkali-containing solution and a rare earth alkali cake. When leaching with sulfuric acid solution, the leaching rate of REO reaches 67.10%, and Ce:F in the obtained leaching solution is about 1:1 (mol), wherein the concentration of REO is 54.46g / L, and the concentration of F is 3.90g / L, and the filter cake ( monazite) REO content is 42.12%, F content is 7.56%. During the alkali conversion process with NaOH solution, about 99.25% of REO rem...

technical field

[0001] The invention relates to the field of hydrometallurgy, in particular to a process method for decomposing Baotou rare earth ore. Background technique

[0002] Rare earth resources are widely used in military, metallurgy, petrochemical, glass ceramics, new materials, agriculture, etc. Especially in high-tech fields such as information, biology, energy technology and national defense construction, it has important uses. my country is the country with the largest reserves of rare earth resources, accounting for more than 30% of the world's total. Among them, Baotou rare earth ore accounts for more than 90% of my country's total reserves, and it is a mixed rare earth ore resource containing monazite and bastnaesite. Because of its complex mineral structure and composition, it is recognized as a difficult-to-smelt mineral in the world. Therefore, it is very important to further develop and study the smelting and separation process of rare earth ores. [...

Examples

Embodiment 1

[0038] Take 500g of Baotou rare earth mixed ore and roast it in a muffle furnace at 400°C for 2h. Baotou rare earth mixed roasting mine with 2.5M H 2 SO 4The solution was leached at 80°C for 30 minutes and then filtered to obtain Th-acid-containing leach solution and filter cake (monazite). The REO content in the leachate is 60g / L. Add 40wt% NaOH solution to the filter cake and react at 150°C for 3h. After the reaction, use hot water at 80°C to slurry, filter, and wash for 1 to 2 times to obtain an alkali-containing solution and a rare-earth alkali cake. When leaching with sulfuric acid solution, the leaching rate of REO reaches 66%, and the Ce:F in the obtained leaching solution is about 1:1 (mol), wherein the concentration of REO is 50.67g / L, and the concentration of F is 3.76g / L. The obtained filter cake (monazite) REO content is 44.18%, F content is 8.12%. In the alkali conversion process with NaOH solution, about 99.81% of REO remained in the rare earth alkali cake, ...

Embodiment 2

[0040] Take 500g of Baotou rare earth mixed ore and roast it in a muffle furnace at 450°C for 2h. 2M H ​​for Baotou Rare Earth Mixed Roasting Mine 2 SO 4 The solution was leached at 80°C for 60 minutes and then filtered to obtain Th-acid-containing leachate and filter cake (monazite). The REO content in the leachate is 57g / L. Add 50wt% NaOH solution to the filter cake and react at 180°C for 3h. After the reaction, the slurry is mixed with hot water and filtered, and then the filter cake is washed with water for 1 to 2 times to obtain an alkali-containing solution and a rare earth alkali cake. When leaching with sulfuric acid solution, the leaching rate of REO reaches 64.84%, and the Ce:F in the obtained leaching solution is about 1:1 (mol), wherein the concentration of REO is 52.46g / L, and the concentration of F is 3.85g / L. The obtained filter cake (monazite) REO content is 42.12%, F content is 7.54%. In the alkali conversion process with NaOH solution, about 98.95% of RE...

Embodiment 3

[0042] Take 500g of Baotou rare earth mixed ore and roast it in a muffle furnace at 300°C for 6h. Baotou rare earth mixed roasting mine with 3M H 2 SO 4 The solution was leached at 100°C for 12 minutes and then filtered to obtain Th-acid-containing leachate and filter cake (monazite). The REO content in the leachate is 60g / L. Add 50wt% NaOH solution to the filter cake and react at 150°C for 5h. After the reaction, the hot water at 80°C is slurried and filtered, and then the filter cake is washed with water for 1 to 2 times to obtain an alkali-containing solution and a rare earth alkali cake. When leaching with sulfuric acid solution, the leaching rate of REO reaches 67.10%, and Ce:F in the obtained leaching solution is about 1:1 (mol), wherein the concentration of REO is 54.46g / L, and the concentration of F is 3.90g / L, and the filter cake ( monazite) REO content is 42.12%, F content is 7.56%. During the alkali conversion process with NaOH solution, about 99.25% of REO rem...

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