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Treatment method of rare earth concentrate

A rare earth concentrate and processing method technology, applied in the field of rare earth concentrate processing, can solve problems such as the reduction of the leaching rate, and achieve the effects of high leaching rate, good fluidity, and promoting the decomposition reaction of the concentrate

Active Publication Date: 2020-03-10
BAOTOU RES INST OF RARE EARTHS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The roasting temperature of the above method is too high, and the roasted ore is easy to form a hard molten body, so that the roasted ore needs to be crushed by ball milling to carry out subsequent leaching operations, otherwise the leaching rate will decrease

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 100kg monazite and bastnaesite mixed rare earth concentrate (REO content is 65wt%) and 150kg magnesium chloride hexahydrate (MgCl 2 : Rare earth concentrate=0.70:1) mixed, heated to 580°C in a muffle furnace, heat preservation reaction for 1.0 hour to obtain a roasted product, cooled to room temperature, and leached with 3mol / L sulfuric acid, the rare earth leaching rate was 98.8%. The calcined product was in powder form, and no molten phase was produced during the calcining process.

Embodiment 2

[0045] Mix 100kg monazite and bastnaesite mixed type rare earth concentrate (REO content is 60wt%) with 180kg magnesium chloride hexahydrate (MgCl 2 : Rare earth concentrate=0.84:1), heated to 580°C in a muffle furnace, heat preservation reaction for 1.5 hours to obtain roasted product, cooled to room temperature, leached with 3mol / L sulfuric acid, rare earth leaching rate 95.6%. The calcined product was in powder form, and no molten phase was produced during the calcining process.

Embodiment 3

[0047] 100kg bastnaesite rare earth concentrate (REO content is 42wt%) is mixed with 50kg magnesium chloride hexahydrate (MgCl 2 : rare earth concentrate=0.23:1), heated to 480 ℃ in the muffle furnace, heat preservation reaction for 1.5 hours to obtain roasted product, cooled to room temperature, leached with 3mol / L sulfuric acid, rare earth leaching rate 95.5%. The calcined product was in powder form, and no molten phase was produced during the calcining process.

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Abstract

The invention discloses a treatment method for rare earth ore concentrates. The treatment method for the rare earth ore concentrates comprises the following steps: mixing chloride of magnesium with rare earth ore concentrates, and then roasting under the condition of air to form a roasted product, wherein the weight ratio of the chloride of the magnesium to the rare earth ore concentrates is 0.5-1.9-1, the weight ratio of MgCl2 in the chloride of the magnesium to the rare earth ore concentrates is 0.23-0.9: 1, the roasting temperature is 460-580 DEG C, and the roasting time is 30-200 minutes;and (2) directly leaching the cooled roasted product by using an acidic solution, wherein the leaching rate of rare earth metals is 95% or above. The high leaching rate can be realized at a low temperature, and the roasted product can be prevented from becoming a fused solution.

Description

technical field [0001] The invention relates to a processing method for rare earth concentrates, in particular to a method for roasting and decomposing rare earth concentrates with magnesium chloride. Background technique [0002] Baotou, Inner Mongolia is blessed with rare earth resources, accounting for 81% of the country's rare earth reserves. Baotou rare earth concentrate accounts for more than 60% of my country's smelting rare earth concentrate. The process of extracting mixed rare earths from rare earth concentrates mainly includes the roasting and decomposition process of concentrated sulfuric acid. The roasting tail gas of this process contains a large amount of acid gases such as sulfur and fluorine, which is treated by water spray absorption method, but the exhaust tail gas is difficult to meet the relevant national emission standards. Because the spray liquid is a mixed acid of sulfuric acid, fluosilicic acid and hydrofluoric acid, it is still difficult to recyc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/08C22B3/08C22B59/00
CPCC22B1/08C22B3/08C22B59/00Y02P10/20
Inventor 许延辉马升峰叶丙秀王荣郭文亮
Owner BAOTOU RES INST OF RARE EARTHS
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