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Method for recovering rare earth and niobium from rare metallic ores

A technology of rare metals and rare earths, which is applied in the field of hydrometallurgy of rare metal ores, can solve the problems of fine particle size and low content of mineral embedding, difficulty in separation and enrichment, etc., and achieve low production costs, wide application prospects, and advanced technology. Simple and Actionable Effects

Inactive Publication Date: 2012-12-26
广东省资源综合利用研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The results of exploratory tests show that, due to the presence of rare earth and niobium in the ore in the form of weathering and alteration residues, the minerals are embedded with fine particle size and low content, and are wrapped and intergrown with leptosphatite and limonite, forming an isomorphic The embedded relationship makes it difficult to dissociate rare earth and niobium minerals, and it is difficult to separate and enrich them by physical beneficiation

Method used

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  • Method for recovering rare earth and niobium from rare metallic ores

Examples

Experimental program
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Effect test

Embodiment 1

[0012] Example 1: REO (RE is rare earth) content 2.93%, Nb 2 o 5 Content 2.12%, TiO 2 The raw ore with a content of 7.05% and an iron grade of 26.3% is ground to -140 mesh, mixed with concentrated sulfuric acid at a mass ratio of 4 / 5 to acid ore, and acidified and decomposed at a temperature of 500°C for 60 minutes. The material decomposed by acid was added with water according to the liquid-solid ratio of 4 / 1, and was leached at 80°C for 90 minutes. After solid-liquid separation, the leaching liquid and leaching residue were obtained. The leaching rate was 12.31%. The leached slag was sorted under the field strength of 5000 Oe to obtain magnetic slag and non-magnetic slag, and Nb in magnetic slag 2 o 5 The content is 1.5%, TiO 2 The content is 22.89%; add water to the leachate according to the volume ratio of leachate / water 1 / 1, boil for 60 minutes, and obtain hydrolyzate and precipitate after solid-liquid separation, and the Nb in the precipitate 2 o 5 The content is ...

Embodiment 2

[0013] Embodiment 2: REO content 2.93%, Nb 2 o 5 Content 2.12%, TiO 2 After the raw ore with a content of 7.05% and an iron grade of 26.3% is ground to -140 mesh, it is mixed with concentrated sulfuric acid at a mass ratio of 1 / 1 of acid ore, and acidified and decomposed at a temperature of 400°C for 120 minutes. The material decomposed by acid was added with water at a liquid-solid ratio of 6 / 1, and leached at 60°C for 120 minutes. After solid-liquid separation, the leaching liquid and leaching residue were obtained. The leaching rate of rare earth was 85.69%, that of niobium was 73.24%, and that of titanium The leaching rate is 14.21%. The leached slag was sorted under the field strength of 7000 Oe to obtain magnetic slag and non-magnetic slag, and Nb in magnetic slag 2 o 5 The content is 1.63%, TiO 2 The content is 23.14%; add water to the leachate according to the volume ratio of leachate / water 6 / 5, boil for 120min, and obtain hydrolyzate and precipitate after solid-l...

Embodiment 3

[0014] Embodiment 3: REO content 2.93%, Nb 2 o 5 Content 2.12%, TiO 2 After the raw ore with a content of 7.05% and an iron grade of 26.3% is ground to -140 mesh, it is mixed with concentrated sulfuric acid at an acid ore mass ratio of 6 / 5, and acidified and decomposed at a temperature of 200°C for 150 minutes. The material after acid decomposition was added with water at a liquid-solid ratio of 8 / 1, and was leached at 100°C for 60 minutes. After solid-liquid separation, the leaching liquid and leaching residue were obtained. The leaching rate of rare earth was 86.38%, that of niobium was 76.24%, and that of titanium The leaching rate is 13.27%. The leached slag was sorted under the field strength of 10000 Oe to obtain magnetic slag and non-magnetic slag, and Nb in magnetic slag 2 o 5 The content is 1.54%, TiO 2 The content is 23.62%; add water to the leachate according to the volume ratio of leachate / water 3 / 2, boil for 180min, and obtain the hydrolyzed liquid and precip...

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Abstract

The invention discloses a method for recovering rare earth and niobium from rare metallic ores. The method is characterized by comprising the following steps of: milling raw ores and acidifying and decomposing with concentrated sulfuric acid; leaching with water and performing solid-liquid separation to obtain a leach solution and leach slag; adding water into the leach solution, boiling and performing solid-liquid separation to obtain a hydrolysate and precipitates; magnetically separating the leach slag to obtain magnetic slag and nonmagnetic slag; uniformly mixing the precipitates with the magnetic slag and smelting to obtain niobium / iron alloy and titanium slag; adjusting the pH value of the hydrolysate with ammonia water and performing solid-liquid separation to obtain a neutral solution and neutral slag; and adding oxalic acid to the neutral solution to obtain rare earth oxalate precipitates, and calcining the precipitates to obtain rare earth oxides. The method provided by the invention is suitable for the comprehensive utilization of composite rare metallic ores with coexistence of rare earth, niobium and titanium, can be used for recovering rare earth, niobium and titanium in the ores at the same, directly preparing rare earth oxides, niobium / iron alloy and titanium slag with TiO2 content of above 30% from the composite rare metallic ores, wherein the content of rare-earth oxides is higher than 92% and the total recovery rate of rare earth is higher than 70%. The method provided by the invention is simple and feasible, has low production costs and broad application prospects.

Description

technical field [0001] The invention relates to a hydrometallurgical method for rare metal ores, in particular to a method for recovering rare earth and niobium from rare metal ores. Background technique [0002] Rare earths and niobium are important basic materials in high-tech fields such as information, biology, and energy, and national defense construction. They play an important role in industries such as metallurgy, electronics, petrochemicals, and aerospace, and are strategic resources related to national security. Australia, Canada, my country's Baiyun Obo, Yunnan, Shanxi and other places are rich in rare earth and niobium symbiotic ores. The general characteristics of this kind of resources are that the content of rare earth and niobium in the ore is relatively low, and at the same time it contains high iron, phosphorus and other elements, and Rare earths are in an associated state, and dissociation is difficult. It is difficult to effectively separate and enrich rar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/08C22B3/20C22B34/24C22B59/00
Inventor 刘勇刘牡丹刘珍珍
Owner 广东省资源综合利用研究所