Technique for extracting and separating rare earth-iron resources from rare earth tailings

A rare earth tailings and rare earth technology, applied in the field of rare earth-iron resource separation and extraction, can solve the problem of unsatisfactory niobium selection index and other problems, and achieve the effects of unique processing method, low equipment investment and short process.

Inactive Publication Date: 2012-02-01
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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example 1

[0019] The main components of Baotou rare earth tailings I (%): TFe: 13.46%, REO: 7.43%, CaO: 20.98%

[0020] This is a low-grade rare earth tailings with low rare earth content and high iron content, so the separation of iron compounds has an important impact on the enrichment of rare earths. The main ore components are: magnetite, pseudo-semi-pseudo hematite Ore, hematite, limonite, dolomite, calcite, soda limestone. Control the reaction time, the amount of sulfuric acid, the concentration of sulfuric acid, and the amount of reducing agent to realize the separation and extraction of iron.

[0021] The preparation process is as follows: the rare earth tailings are dried in an oven at 50°C for 10 hours, and ground to make the particle size as small as possible, which can pass through a standard sieve of 120 mesh / inch. Accurately weigh 15.00g of dried and ground rare earth tailings into a plastic beaker, add 50mL of 47% sulfuric acid, heat and stir in a 90°C constant temperatu...

example 2

[0023] The main components of Baotou rare earth tailings II (%): TFe: 18.20%, REO: 6.69%, CaO: 16.1%

[0024] This is a low-grade rare earth tailings with low rare earth content and high iron content, so the separation of iron compounds has an important impact on the enrichment of rare earths.

[0025] The preparation process is as follows: the rare earth tailings are dried in an oven at 70°C for 5 hours, and then ground to make the particle size as small as possible, which can pass through a standard sieve of 120 mesh / inch. Accurately weigh 15.00g of dried and ground rare earth tailings into a plastic beaker, add 60mL of 47% sulfuric acid, heat and stir in a constant temperature water bath at 90°C~100°C for 4 hours, let it stand, and cool to room temperature, more than 90% of iron Dissolve and enter the solution, while the rare earth is still in the solid phase, filter with suction to separate the solid from the liquid. Add a reducing agent to the filtrate to reduce the ferr...

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Abstract

The invention discloses a technique for extracting and separating rare earth-iron resources from rare earth tailings, which is a technique for extracting and separating rare earth-iron from rare earth tailings through crystallization under the action of organic solvents. The technique disclosed by the invention comprises three technical operations which are respectively as follows: 1, a sulfuric acid leaching-diluted hydrochloric acid leaching technique of rare earth tailings; 2, an Fe<3+> reduction technique of a sulfuric acid leaching solution; and 3, a ferric sulfate crystallization technique under the action of organic solvents. A chemical purpose of extracting and separating rare earth-iron elements is achieved by using the technique disclosed by the invention. The technique is suitable for extracting and separating rare earth-iron elements from various types of ores containing the rare earth-iron and industrial residues, has stronger feasibility and higher product purity, is simple in operation and low in cost, and plays an important role in comprehensively utilizing the tailings and relieving environment pollution and resource waste.

Description

technical field [0001] The invention relates to a rare earth-iron resource separation and extraction technology, in particular to a rare earth tailings rare earth-iron resource separation and extraction technology. Background technique [0002] In recent years, with the rapid development of my country's economy, the demand for iron ore in the iron and steel industry is increasing. my country's mineral resources are increasingly scarce and exhausted, and it has to rely heavily on imports, resulting in a large loss of foreign exchange. As a compensation, the recovery of valuable elements from secondary resources such as tailings has received widespread attention. Tailings not only occupy a large amount of land, but also cause great harm to the ecological environment. Recycling of tailings is conducive to expanding the scope of mineral resources utilization, prolonging the service life of mines, alleviating the pressure of ore imports, and reducing environmental pollution, whi...

Claims

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Application Information

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IPC IPC(8): C22B3/06C22B3/26C22B59/00
CPCY02P10/20
Inventor 张丽清赵玲燕袁本福
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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