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Method for separating and recovering iron, rare earth and fluorine from rare-earth-contained tailings after beneficiating iron

A technology for separation, recovery and magnetic separation of tailings, applied in solid separation, improvement of process efficiency, calcium/strontium/barium fluoride, etc., can solve the problem of inability to efficiently separate and recover iron, small difference in magnetic susceptibility, and low recovery rate of tailings and other problems, to achieve good kinetic conditions, low production costs, and improved reduction efficiency.

Active Publication Date: 2021-05-14
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the close symbiotic relationship between iron-containing minerals and gangues, the difference in specific magnetic susceptibility of iron-containing minerals is small (hematite: 18~30×10 -6 cm 3 / g, iron-containing silicate such as sodium pyroxene: 67.3×10 -6 cm 3 / g, sodium amphibole: 37.9×10 -6 cm 3 / g), the use of conventional magnetic separation technology has been unable to efficiently separate and recover iron
At the same time, conventional beneficiation methods have low recovery rate, poor separation effect, high production cost, large amount of waste residue, and environmental pollution when dealing with this type of tailings.

Method used

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  • Method for separating and recovering iron, rare earth and fluorine from rare-earth-contained tailings after beneficiating iron
  • Method for separating and recovering iron, rare earth and fluorine from rare-earth-contained tailings after beneficiating iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053]A method of separating recycled iron, rare earth and fluorine from the selection of rare mines with rare earths in Baiyun, and, flow schematicfigure 1 As shown, the specific steps are as follows:

[0054](1) Put Baiyun, a rare earth-free ore, (with 12.4% by mass fraction, its rare earth (with REO) content is 8.7%, the iron element content is 14.5%, its dioxide The silicon content is 11.5%, its calcium oxide content is 11.9%, its calcium fluoride content is 25.6%;) additive (calcium oxide powder) and pulverized coal (fixed carbon content 80%) according to 100: 10: 6.7 The proportion is uniformly mixed to give a mixture.

[0055](2) Press the material after mixing the material into a block or a ball, and the treated material is treated with a block or spherical material, the calcination temperature is 1150 ° C, the calcination temperature is 120 minutes, and the bake is ended. After water, it is cooled to obtain a baking mine.

[0056](3) Treatment of the baked mine after cooling in step...

Embodiment 2

[0064](1) Popularizing the ribbing mine of Baiyun, rare earth (which is 12.5% ​​by mass fraction, its rare earth (with REO) content is 7.1%, the iron element content is 20.4%, its silica The content is 12%, its calcium oxide content is 7.5%, its calcium fluoride content is 25.6%), additives (calcium carbonate powder) and pulverized coal (fixed carbon content of 80%) are uniform according to 100: 20: 10 Mixed to give a mixture.

[0065](2) Press the material after mixing the material after step (1), and the treated material is treated with a block-shaped or spherical material, the calcination temperature is 1200 ° C, the calcination temperature is 60 minutes, and the bake is completed. After water, it is cooled to obtain a baking mine.

[0066](3) Cooling the calcined ore after cooling in step (2), the final material particles are less than 75 microns to 80% or more.

[0067](4) The ball milling product obtained by step (3) is magnetically selected separately, magnetic selection is performed ...

Embodiment 3

[0074](1) Putting Baiyun, rare earth-tail mite (whose fluorine element content is 10.2% (mass fraction), and its rare earth (with REO) content is 8.7% (mass fraction), and its iron element content is 14.5%. Quality fraction), its silica content is 15% (mass fraction), its calcium oxide content is 11.9% (mass fraction), its fluoride content is 20.9% (mass fraction)), additive (Dolomite powder) and Coal (fixed carbon content is around 60%) is uniformly mixed according to 100: 21: 9.3 mass proportion to obtain a mixture.

[0075](2) Press the material after mixing the material after step (1), and the treated material is treated with a block or spherical material, the calcination temperature is 1100 ° C, the calcination temperature is 100 minutes, and the bake is ended. After water, it is cooled to obtain a baking mine.

[0076](3) Cooling the calcined ore after cooling in step (2), the final material particles are less than 75 microns to 80% or more.

[0077](4) The ball milling product obtaine...

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Abstract

The invention relates to a method for separating and recovering iron, rare earth and fluorine from rare-earth-contained tailings after beneficiating iron. The method comprises the steps that the rare-earth-contained tailings after beneficiating iron, an additive and pulverized coal are subjected to roasting, ball-milling and magnetically separating after being mixed, briquetted or pelletized to obtain magnetic iron ore concentrate and magnetic tailings; hydrochloric acid is added into the magnetic tailings for leaching, and rare earth chloride leaching liquid and leaching residues rich in calcium fluoride are obtained after filtering; and water is added into the leaching residues to be stirred to form ore pulp, water glass, sodium oleate and terpenic oil are added to obtain rougher concentrate and rougher tailings, and after concentration, calcium fluoride concentrate and total tailings containing a mixture of silicate and a small amount of calcium fluoride are obtained. The method disclosed by the invention has the characteristics of good separation effect, high recovery rate of iron and rare earth, low production cost, large treatment capacity, environmental friendliness and the like, and is a process method relating to the fields of non-blast furnace ironmaking, hydrometallurgy, mineral processing technologies and comprehensive utilization of resources.

Description

Technical field[0001]The present invention relates to a method of separating recovery iron, rare earth and fluorine from a rare earth, belonging to the technical field of non-blast furnace iron, mineral processing technology and resource utilization.Background technique[0002]The Baiyun and Mine is a large iron, rare earth, niobium, fluorine such as a large iron, rare earth, niobium, and fluorine, etc. in the middle of the China Inner Mongolia Autonomous Region (the north of Baotou City). It is also the largest rare earth deposit in the world. It has complex ore types, mineral embedded The granules are fine, the symbiotic relationship is closely related to each other, the mineral element is complicated, and the physical and chemical properties between the minerals and the pulse minerals is similar, and the differential difference is characterized. It has now been found that the Baiyun Hubo mine contains 71 elements, more than 170 kinds of minerals, including 28 elements of the value,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B9/00B03B1/00C22B3/10C22B59/00C22B1/02C01F11/22
CPCB03B9/00B03B1/00C22B3/10C22B59/00C22B1/02C01F11/22Y02P10/20
Inventor 薛向欣周延宋世哲杨合
Owner NORTHEASTERN UNIV
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