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Comprehensive recovery method of rare metal ore

A rare metal and ore grinding technology, used in the field of tantalum and iron, comprehensive recovery of rare earth and niobium, can solve the problem of no economical and effective means of resource development and utilization, poor sorting effect, and failure to obtain rare earth, niobium and tantalum alone. Concentrates or mixed concentrates, etc., to achieve the effect of broad application prospects

Active Publication Date: 2012-10-03
广东省资源综合利用研究所
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complex nature of the original ore, the ore is treated by physical beneficiation, and the separation effect is very poor. None of the individual concentrates or mixed concentrates of rare earths, niobium, and tantalum can be obtained. So far, there is no economical and effective means to realize the recovery of such resources. develop and use

Method used

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  • Comprehensive recovery method of rare metal ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: REO content 2.65%, Nb 2 o 5 Content 1.83%, Ta 2 o 5 Content 0.071%, iron grade 23.74% raw ore grinding to -0.074mm content accounted for 75%, add 20% sodium chloride to mix, make pellets, pellets are dried and mixed with bituminous coal at a mass ratio of 1 / 1, Heating at 1100°C for 60min; pellet grinding until the content of -0.074mm accounts for 82%, and magnetic separation at a magnetic field strength of 550mT to obtain reduced iron powder and magnetic separation tailings. The TFe of the reduced iron powder is 90.43%, and the recovery of iron The rate is 90.85%. Add concentrated sulfuric acid to the magnetic separation tailings at a mass ratio of 1 / 1 of acid ore, acidify at 450°C for 60 minutes, then add water at a liquid-solid ratio of 2 / 1 for leaching at 20°C for 240 minutes, and obtain a primary leachate and One leaching slag. The primary leaching slag is leached with water at a liquid-solid ratio of 2 / 1 for 150 minutes. After solid-liquid separatio...

Embodiment 2

[0014] Example 2: REO content 2.65%, Nb 2 o 5 Content 1.83%, Ta 2 o 5 Content 0.071%, iron grade 23.74% raw ore grinding to -0.074mm content accounted for 80%, add 40% sodium chloride to mix, make pellets, pellets are dried and mixed with bituminous coal at a mass ratio of 1 / 1.5, Heating at 1050°C for 120min; pellet grinding until the content of -0.074mm accounts for 85%, and magnetic separation at a magnetic field strength of 900mT to obtain reduced iron powder and magnetic separation tailings. The TFe of the reduced iron powder is 91.02%, and the recovery of iron The rate is 91.45%. Add concentrated sulfuric acid to the tailings of magnetic separation according to the acid ore mass ratio of 1.5 / 1, acidify at 300°C for 120min, then add water at 50°C for 120min according to the liquid-solid ratio of 4 / 1, and obtain a leachate after solid-liquid separation and One leaching slag. The primary leaching slag is leached with water at a liquid-solid ratio of 6 / 1 for 90 minutes. ...

Embodiment 3

[0015] Example 3: REO content 2.65%, Nb 2 o 5 Content 1.83%, Ta 2 o 5 Content 0.071%, iron grade 23.74% raw ore grinding to -0.074mm content accounted for 86%, add 50% sodium chloride to mix, make pellets, pellets are dried and mixed with bituminous coal at a mass ratio of 1 / 2, Heating at 850°C for 180min; pellet grinding until the content of -0.074mm accounts for 87%, magnetic separation at a magnetic field strength of 1200mT, to obtain reduced iron powder and magnetic separation tailings, magnetic separation tailings TFe is 90.33%, iron The recovery rate was 91.67%. Add concentrated sulfuric acid to the tailings of magnetic separation according to the acid ore mass ratio of 2 / 1, acidify at 150°C for 180 minutes, then add water at 90°C for 30 minutes according to the liquid-solid ratio of 6 / 1, and obtain a primary leachate and One leaching slag. The primary leaching slag is leached with water at a liquid-solid ratio of 10 / 1 for 30 minutes. After solid-liquid separation, ...

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Abstract

The invention discloses a comprehensive recovery method of rare metal ore. The method is characterized by comprising the following steps of: grinding the raw ore, adding sodium chloride, and uniformly mixing and pelletizing; drying the pellets and uniformly mixing with soft coal; performing heating, grinding and magnetic separation to obtain the reduced iron powder and magnetic separation tailings; adding concentrated sulfuric acid into the magnetic separation tailings for acidification; adding water for primary leaching; performing solid-liquid separation to obtain the primary leaching liquid and primary leaching slag; adding water into the primary leaching slag, leaching and performing solid-liquid separation to obtain secondary leaching liquid and secondary leaching slag; stockpiling the secondary leaching slag; mixing the primary leaching liquid and the secondary leaching liquid; concentrating; adding sodium sulfate to the concentrate; reacting and performing solid-liquid separation to obtain the rare-earth sulphate double salt and solution rich in niobium and tantalum; adding sodium carbonate solution to the rare-earth sulphate double salt; reacting to obtain rare-earth carbonate; calcining to obtain rare earth oxide; adding ammonia water to adjust the pH value of the solution rich in niobium and tantalum; stirring and performing solid-liquid separation to obtain niobium and tantalum precipitates; and calcining the precipitates to obtain the niobium and tantalum concentrate. The invention provides a comprehensive recovery method of rare earth, niobium and tantalum from the rare metal ore.

Description

technical field [0001] The invention relates to a method for comprehensively recovering rare earth, niobium, tantalum and iron from rare metal ores. Background technique [0002] Iron is the largest metal supporting the development of the national economy. Rare earths, niobium, and tantalum are important basic materials for high-tech fields such as information, biology, energy, aerospace, superconducting materials, military industry, and national defense construction. An important strategic resource for security. With the acceleration of the industrialization process and the increasing consumption of resources, the development and utilization of low-grade and difficult-to-handle complex co-associated metal resources is urgently put on the research agenda. Canada, Australia, and my country's Inner Mongolia, Yunnan, Xinjiang, Shanxi and other places are rich in polymetallic symbiotic rare metal ores. Such resources are often associated with rare metal elements such as rare ea...

Claims

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Application Information

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IPC IPC(8): C22B1/00C22B1/02B03C1/015C22B3/04C22B3/44C22B59/00C22B34/24
CPCY02P10/20
Inventor 刘勇陈少纯刘牡丹何晓娟刘珍珍
Owner 广东省资源综合利用研究所
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