Beneficiation method for improving rare earth grade of rare earth ore

A beneficiation method and rare earth ore technology, applied in flotation, solid separation and other directions, can solve the problems of difficulty in preparing rare earth concentrates, no flotation efficiency, low recovery rate, etc., achieve high separation performance, improve beneficiation efficiency, The effect of reducing smelting costs

Inactive Publication Date: 2012-01-18
INNER MONGOLIA UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

However, it is difficult to prepare a qualified rare earth concentrate with a grade of more than 65% by using the original beneficiation process. Blending together with a simple sweep, recovery is naturally low when producing high grade rare earth concentrates
2. Due to the complexity of rare earth minerals, the requirements for flotation agents and flotation conditions are relatively high. When the accumulation of agents is serious and the hardness of the pulp water is high, the agents will fail and the flotation efficiency will not be achieved.

Method used

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  • Beneficiation method for improving rare earth grade of rare earth ore

Examples

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Effect test

Embodiment 1

[0025] Baiyun Obo mixed rare earth concentrate with a rare earth grade of 38.26%, using the process technology of the present invention, has formulated a closed-circuit cycle beneficiation process flow of one-time roughing, four-time beneficiation and one-time sweeping, and a hydrocyclone is used in the whole process For the corresponding selected middle ore and sweeping middle ore, the water eluting medicine is carried out, and the quality of water added to the hydrocyclone is 3 times the weight of the mineral, and the water temperature is 25°C.

[0026] 1) Rough separation: Add the mixed rare earth concentrate containing 38.26% REO into the flotation tank, add water to mix and adjust the pulp to control the mass concentration of the pulp at 45% and start stirring. The temperature of the pulp is 38°C; Add water glass 0.8kg / t, LF8#1.8kg / t, 318 is 0.12kg / t, and the pH of the pulp is 9.4. Under these conditions, roughing is carried out to obtain roughing concentrate and roughing ...

Embodiment 2

[0033] Baiyun Obo mixed rare earth concentrate with a rare earth grade of 44.58%, using the process technology of the present invention, has formulated a closed-circuit cycle mineral processing process of primary roughing, three-time beneficiation and secondary sweeping. The selected middle ore and the sweeping middle ore are used to elute the medicine with water. The quality of water added to the filter is 0.5 times the weight of the mineral, and the water temperature is 55°C.

[0034] 1) Rough separation: the mixed rare earth concentrate containing 44.58% REO, and the two medium ores produced by the first stage of concentration and the first stage of sweeping after water elution are added to the flotation tank together In the process, add water to mix and adjust the pulp to control the pulp mass concentration at 35% and start stirring. The temperature of the pulp is 50°C; while stirring, add water glass 1.0kg / t in sequence, H205 is 1.6kg / t, and No. 2 oil is 0.12kg / t, the pH...

Embodiment 3

[0041] Baiyun Obo mixed rare earth concentrate with a rare earth grade of 48.99%, using the process technology of the present invention, formulates a process flow for primary roughing, three-time beneficiation and secondary sweeping, and uses a hydrocyclone to process the corresponding beneficiation medium ore Carry out water elution medicine with sweeping ore, the addition amount of water is 10 times of mineral weight when water elution medicine, water temperature 10 ℃.

[0042] The amount of reagents added in flotation is calculated by weight ratio: rough selection: water glass 1.8kg / t, LF10#2.5kg / t, 318 is 0.18kg / t; first fine: water glass 0.6kg / t, LF10#1.2kg / t, 318 is 0.06kg / t; second refinement: water glass 0.5kg / t, LF10#1.3 / t, 318 is 0.05kg / t; three refinement: water glass 0.2kg / t, LF10#1.2kg / t, 318 is 0kg / t; first sweep: water glass 0.4kg / t, LF10#1.5kg / t, 318 is 0.05kg / t; second sweep: water glass 0kg / t, LF10#0.8kg / t, 318 is 0.04kg / t. The mass concentration of the r...

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Abstract

The invention relates to a beneficiation method for improving rare earth grade of rare earth ore, and belongs to the technical field of beneficiation technologies. The method is a beneficiation method by using low-grade rare earth ore concentrate to prepare high-grade rare earth ore concentrate and is characterized in that: the low-grade rare earth ore concentrate of which rare earth ore (REO) grade is below 60 percent and which is widely used in conventional production is used as a raw material; a washing reagent removal process which is never used in the traditional rare earth beneficiationis adopted in a beneficiation technology; and the whole flotation process adopts a mode of closed cycle beneficiation, so middling ore cannot be produced, and the grade and the recovery rate of the ore concentrate are improved. The invention has the remarkable characteristics that: the high-grade rare earth ore concentrate of which the REO grade is more than or equal to 65 percent and the recovery rate is more than or equal to 95 percent are produced, and high-quality raw materials are provided for effective improvement of the traditional rare earth smelting technology.

Description

technical field [0001] The invention relates to a mineral processing method for preparing high-grade rare earth concentrate from low-grade rare earth concentrate, and belongs to the technical field of mineral processing technology. Background technique [0002] The rare earth concentrates used in Baotou rare earth concentrate smelting are basically low-grade concentrates, and the rare earth grades in the concentrates are generally around 50%. There are currently two main processes for processing this mixed rare earth concentrate, one is the concentrated sulfuric acid roasting method, and the other is the sodium hydroxide decomposition method. The concentrated sulfuric acid roasting process was applied to rare earth smelting as early as 30 years ago, which seemed to be an effective smelting method for extracting rare earths at that time. However, with the development of science and technology and the increasing emphasis on environmental protection, many shortcomings of this ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/00
Inventor 李梅柳召刚高凯张栋梁王觅堂胡艳宏
Owner INNER MONGOLIA UNIV OF SCI & TECH
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