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Treatment method for rare earth tailings

A treatment method and technology of rare earth tailings, applied in the field of rare earth tailings treatment, can solve the problems of low resource utilization, waste of resources, high cost, etc., and achieve the effects of low roasting temperature, short process flow and easy operation

Active Publication Date: 2020-07-03
BAOTOU RES INST OF RARE EARTHS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this process is that the resource utilization rate is low, only the rare earth concentrate and iron concentrate are recovered, and the recovery rate still needs to be improved. The recovery rate of rare earth is about 70%, and the recovery rate of iron is only about 20%; and, Failure to recover more valuable elements
The problem with this method is that the mineral properties change after roasting, the flotation of niobium is difficult, and the grade and recovery rate of rare earth and niobium are low, resulting in waste of resources
In addition, a variety of collectors are used in this method, which on the one hand causes high cost and on the other hand makes waste liquid treatment difficult
[0006] To sum up, the methods currently used to treat rare earth tailings cannot achieve a good recovery effect, that is, they cannot recover valuable elements such as iron, rare earth, niobium, and scandium separately.

Method used

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  • Treatment method for rare earth tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The composition of the rare earth tailings used is: iron grade (TFe) is 16.2%, rare earth REO grade is 6.0%, niobium grade (Nb 2 o 5 ) is 0.16%, scandium grade (Sc 2 o 3 ) was 0.011%, and the F content was 4.88%.

[0039] Dry the rare earth tailings at 90°C, grind and sieve to a particle size of 140-160 μm to obtain pretreated rare earth tailings; mix the pretreated rare earth tailings with calcium chloride, ammonium chloride, calcium oxide, oxidation Magnesium and anthracite are mixed uniformly at a weight ratio of 1:0.16:0.4:0.05:0.05:0.2 to obtain a mixed material; the mixed material is placed in a tube furnace and roasted at 600°C for 1.8h to obtain roasting flue gas and roasting scum. The roasting flue gas is cooled by a cooling device at 100°C to obtain niobium chloride (Nb 2 Cl 5 )product.

[0040] Dry-grind the roasted slag with a grinding fineness of -0.074mm56% to obtain the ground roasted slag; leaching the ground roasted slag with water at 90°C for 1....

Embodiment 2

[0044] The composition of the rare earth tailings used is: iron grade (TFe) is 16.71%, rare earth REO grade is 5.06%, niobium grade (Nb 2 o 5 ) is 0.11%, scandium grade (Sc 2 o 3 ) was 0.012%, and the F content was 3.96%.

[0045] Dry the rare earth tailings at 90°C, grind and sieve to a particle size of 140-160 μm to obtain pretreated rare earth tailings; mix the pretreated rare earth tailings with calcium chloride, ammonium chloride, calcium oxide, oxidation Magnesium and anthracite are mixed uniformly at a weight ratio of 1:0.1:0.3:0.04:0.05:0.2 to obtain a mixed material; the mixed material is placed in a tube furnace and roasted at 600°C for 2 hours to obtain roasting flue gas and roasting slag . The roasting flue gas is cooled by a cooling device at 150°C to obtain niobium chloride (Nb 2 Cl 5 )product.

[0046] Dry-grind the roasted slag with a grinding fineness of -0.074mm60% to obtain the ground roasted slag; leaching the ground roasted slag with water at 90°C f...

Embodiment 3

[0050] The composition of the rare earth tailings used is: iron grade (TFe) is 12.60%, rare earth REO grade is 5.11%, niobium grade (Nb 2 o 5 ) is 0.18%, scandium grade (Sc 2 o 3 ) was 0.014%, and the F content was 3.75%.

[0051] Dry the rare earth tailings at 95°C, grind and sieve to a particle size of 140-160 μm to obtain pretreated rare earth tailings; mix the pretreated rare earth tailings with calcium chloride, ammonium chloride, calcium oxide, oxidation Magnesium and anthracite are mixed uniformly at a weight ratio of 1:0.2:0.4:0.035:0.04:0.2 to obtain a mixed material; the mixed material is placed in a tube furnace and roasted at 650°C for 1.5h to obtain roasting flue gas and roasting scum. The roasting flue gas is cooled by a cooling device at 150°C to obtain niobium chloride (Nb 2 Cl 5 )product.

[0052] The roasted slag is subjected to dry grinding, the grinding fineness is -0.074mm57.3%, and the ground roasted slag is obtained; the ground roasted slag is lea...

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Abstract

The invention discloses a treatment method for rare earth tailings. The treatment method comprises the following steps that firstly, pretreated rare earth tailings and calcium chloride containing inorganic matter are mixed, a mixed material is obtained, the mixed material is roasted at 480-750 DEG C, roasted smoke and roasted slag are obtained, the roasted smoke is cooled, and a niobium chloride containing product is obtained; secondly, the roasted slag is leached through water, then, solid-liquid separation is conducted, and a rare earth chloride solution and water leaching slag are obtained;thirdly, the water leaching slag is subjected to primary ore grinding and primary magnetic separation, roughing iron concentrates and roughing tailings are obtained, the roughing iron concentrates are subjected to secondary ore grinding and secondary magnetic separation, and finely-selected iron concentrates and finely-selected tailings are obtained; and fourthly, the roughing tailings and the finely-selected tailings are mixed, mixed tailings are obtained, the mixed tailings are leached through hydrochloric acid, then, solid-liquid separation is conducted, and a scandium chloride containingproduct is obtained, wherein the calcium chloride containing inorganic matter comprises calcium chloride, calcium oxide and blind coal. By means of the treatment method, respective recycling of iron,rare earth, niobium and scandium can be achieved.

Description

technical field [0001] The invention relates to a treatment method for rare earth tailings, in particular to a treatment method for Baiyan Obo rare earth tailings. Background technique [0002] With the massive development and utilization of mineral resources, rare earth tailings, as a secondary resource, have received more and more attention from all over the world. Baiyan Obo rare earth tailings are tailings produced after iron, rare earth and fluorspar are selected. The tailings contain a large amount of iron and are associated with available resources such as rare earth, niobium and scandium. Due to the complex mineral composition of the tailings, the dispersion of useful minerals, the extremely fine particle size, and the long-term soaking in wastewater and surface differentiation, the surface properties of the ore have undergone serious changes, which restricts the development and utilization of valuable resources in the Baiyan Obo rare earth tailings. The composition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B7/00C22B34/24C22B59/00B03B1/00B03B7/00
CPCC22B1/02C22B7/006C22B7/007C22B34/24C22B59/00B03B1/00B03B7/00Y02P10/20
Inventor 王维维李二斗候少春张立锋王其伟李强郭春雷金海龙
Owner BAOTOU RES INST OF RARE EARTHS
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