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Method used for extracting uranium and niobium from low-grade ore

A low-grade, uranium separation technology, applied in the field of hydrometallurgy, to achieve the effects of high uranium and niobium leaching rate, low reagent cost, reduced processing capacity and reagent consumption

Inactive Publication Date: 2017-05-10
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the comprehensive extraction of metal uranium often associated with niobium and tantalum ores, especially the extraction process for extracting and separating uranium and niobium from low-grade ores, there are few reports on the existing data.

Method used

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  • Method used for extracting uranium and niobium from low-grade ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A low-grade uranium-containing niobium ore contains 0.425% uranium and 0.359% niobium. The ore is finely ground to -0.030mm and the proportion of ore is 50%. The ore after grinding and concentrated sulfuric acid (98wt%) are ore: concentrated sulfuric acid = 1:0.6 for batching and mixing uniformly, put it in the roaster after 0.5h at room temperature, and roast for 2h at 230℃. After roasting, the clinker is leached with 10wt% sulfuric acid solution, the mass ratio of the leaching liquid is 1.5:1, the leaching temperature is 60°C, and the leaching rate is 1h. The uranium leaching rate is 98.75% and the niobium leaching rate is 86.26%. The leaching pulp is filtered and washed to obtain a filtrate containing uranium and niobium, and the leaching residue is discarded after the washing treatment. The uranium in the organic relative leachate composed of 6% P204 + 5% TBP + 1% P311 + 88% sulfonated kerosene is used for collaborative extraction. The extraction ratio (O / A) is 1.2,...

Embodiment 2

[0029] A low-grade uranium-bearing niobium ore contains uranium content of 0.368%, niobium content of 1.655%, and the ore is ground to -0.025mm, and the ratio of ore is 45%. After grinding the ore and concentrated sulfuric acid (85wt%) according to the mass ratio of the ore: concentrated sulfuric acid = 1:0.8 for batching and mixing uniformly, put it in the roaster at room temperature for 1 hour, and roast at 260°C for 4 hours. After roasting, the clinker is leached with 15wt% sulfuric acid solution, the mass ratio of the leaching liquid is 1.5:1, the leaching temperature is 60℃, the leaching time is 2h, the uranium leaching rate is 98.65%, and the niobium leaching rate is 92.57%. The leaching pulp is filtered and washed to obtain a filtrate containing uranium and niobium, and the leaching residue is discarded after the washing treatment. The uranium in the organic relative leachate composed of 5% P204 + 5% TBP + 2% P311 + 88% sulfonated kerosene is used for collaborative extra...

Embodiment 3

[0031] A low-grade uranium-containing niobium ore contains 0.412% uranium and 0.629% niobium. The ore is finely ground to -0.025mm and the ratio of ore is 60%. The ore after grinding and concentrated sulfuric acid (90wt%) are ore: concentrated sulfuric acid = 1:1 batching, mixing uniformly, placed at room temperature for 1h, then transferred to the roaster, roasted at 280℃ for 3h. After roasting, the clinker was leached with a 10wt% sulfuric acid solution, the leaching liquid solid volume ratio was 2:1, the leaching temperature was 80°C, the leaching time was 1.5h, the uranium leaching rate was 98.52%, and the niobium leaching rate was 92.57%. The leaching pulp is filtered and washed to obtain a filtrate containing uranium and niobium, and the leaching residue is discarded after the washing treatment. The uranium in the organic relative leachate composed of 8% P204 + 5% TBP + 2% P311 + 85% sulfonated kerosene is used for collaborative extraction. The extraction ratio (O / A) is ...

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Abstract

The invention provides a method used for integrated extraction separation of uranium and niobium from low-grade ore. The method comprises following steps: 1, ore containing uranium and niobium is grinded; 2, grinded ore is mixed with concentrated sulfuric acid at a certain mass ratio, and an obtained mixture is subjected to roasting for 0.5 to 6h at 150 to 300 DEG C; 3, a clinker obtained via roasting is subjected to leaching with a 0 to 20wt% sulfuric acid solution, leach slurry is subjected to filtering and washing so as to obtain a filtrate containing uranium and niobium; 4, P2O4, TBP, P311, and sulfonated kerosene mixed organic phase are subjected to synergistic extraction of uranium in the filtrate, a uranium-containing organic phase is subjected to reextraction with a 8wt% to 15wt% Na2CO3 solution, and an obtained reextraction qualified liquid is subjected to precipitation with NaOH so as to obtain '111' products; and 5, after uranium extraction, an obtained solution is delivered into an autoclave, and is subjected to reaction at 110 to 200 DEG C under a pressure maintained to be 0.14 to 1.55MPa, and cooling filtering is carried out so as to obtain a niobium-containing precipitate and a niobium precipitation mother liquor, and then the niobium precipitation mother liquor is recycled to leaching. The method is capable of solving problems that uranium-containing low-grade niobium ore comprehensive extraction and recycling are difficult to realize, metal recovery rate is high, and processing treatment cost is low.

Description

Technical field [0001] The invention belongs to the field of hydrometallurgy, and specifically relates to a method for extracting and separating uranium and niobium from low-grade ore. Background technique [0002] my country is rich in niobium and tantalum resources, with niobium reserves of approximately 116,500 tons, and industrial reserves of tantalum resources of 39,800 tons, which are mainly distributed in Jiangxi, Xinjiang, Guangxi, Hunan, Sichuan, Inner Mongolia and other provinces. It is worth noting that although my country is rich in niobium and tantalum resources, most of the niobium and tantalum deposits are polymetallic symbiosis ore, and their mineral composition mostly exists in the form of ilmenite rutile and columbite, with an embedded particle size of 20μm, and the original ore grade is not high ( <0.02%), belonging to low-grade hard-to-decompose ore, and it is difficult to enrich to obtain concentrate. [0003] At present, both domestic and foreign niobium-ta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B60/02C22B34/24C22B3/08C22B3/38
CPCC22B3/08C22B34/24C22B60/0234C22B60/026C22B3/384
Inventor 刘会武向秋林师留印贾秀敏刘忠臣黄永刘智杨剑飞陈天宝
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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