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Process method for recovering rare earth from cerium oxide waste material

A process method, cerium oxide technology, applied in the field of hydrometallurgy, to achieve the effect of simple and feasible process method, high rare earth recovery rate, and easy large-scale use

Inactive Publication Date: 2016-11-23
BAOTOU HUAMEI RE PRODS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no literature report on the recovery of rare earths from cerium oxide wastes containing rare earth elements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Take 30g of cerium oxide waste (REO 82.03wt%) through a 100-mesh sieve to remove solid impurities such as weeds and gravel, then add 1.2 times the theoretical amount of sulfuric acid and 1.2 times the theoretical amount of FeSO 4 , heated to 45°C-55°C under constant stirring for 1.5h, and solid-liquid separation was carried out to obtain a primary leachate, the primary leachate was neutralized with MgO to remove impurities, and the second solid-liquid separation was obtained to obtain a secondary leachate, in the leachate The recovery rate of rare earth elements is 83.23%.

Embodiment 2

[0014] Take 30g of cerium oxide waste (REO 82.03wt%) and pass through a 100-mesh sieve to remove solid impurities such as weeds and gravel, then add 1.3 times the theoretical amount of sulfuric acid and 1.3 times the theoretical amount of FeSO 4 , heated to 45°C-55°C under constant stirring for 1h, and solid-liquid separation was carried out to obtain a primary leachate, the primary leachate was neutralized with MgO to remove impurities, and then the second solid-liquid separation was obtained to obtain a secondary leachate, the leachate The recovery rate of rare earth elements was 81.58%.

Embodiment 3

[0016] Take 30g of cerium oxide waste (REO 82.03wt%) through a 100-mesh sieve to remove solid impurities such as weeds and gravel, then add 1.4 times the theoretical amount of sulfuric acid and 1.4 times the theoretical amount of FeSO 4 , heated to 45°C-55°C under constant stirring for 1h, and solid-liquid separation was carried out to obtain a primary leachate, the primary leachate was neutralized with MgO to remove impurities, and then the second solid-liquid separation was obtained to obtain a secondary leachate, the leachate The recovery rate of rare earth elements was 82.11%.

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Abstract

The invention relates to a process method for recovering rare earth from a cerium oxide waste material. The process method is characterized in that the cerium oxide waste material with 70-85wt% of REO is screened through a sieve with the mesh being 100 to remove solid impurities such as weeds and crushed stones, 1-1.4 times the theoretical amount of sulfuric acid and not less than 1-1.4 times the theoretical amount of FeSO4 are added, and a mixture is heated to 45 DEG C to 55 DEG C under continuous stirring; then leaching is conducted for 1 h to 1.5 h, solid-liquid separation is conducted, and a primary leaching solution is obtained; and the primary leaching solution is neutralized with MgO and subjected to impurity removal, then secondary solid-liquid separation is conducted, and a secondary leaching solution is obtained. The process method has the beneficial effects that the process method is simple and feasible, capable of being used easily on a large scale and high in rare earth recovery rate, and the recovery rate of the rare earth element in the secondary leaching solution is higher than 80%.

Description

technical field [0001] The invention relates to a process for recovering rare earth from cerium oxide waste, belonging to the technical field of hydrometallurgy. Background technique [0002] Cerium oxide (CeO 2 ) is a relatively important light rare earth product, which has been widely used in industry due to its special properties, and its demand is increasing rapidly, with broad prospects. The physical and chemical properties of cerium oxide can directly affect the performance of its applied materials. For example, the addition of ultra-fine cerium oxide can reduce the sintering temperature of ceramics and increase the density of ceramics. Because cerium has variable valence, it also has an important impact on luminescent materials. With the wide application of nanotechnology, the research and application of nano-cerium oxide has gradually become a research hotspot. At the same time as the industrial production of cerium oxide, a large amount of cerium oxide waste is al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B59/00
CPCC22B7/007C22B59/00Y02P10/20
Inventor 许国华赵军刘磊杨洁谢军亢璟轩王永利彭婧代永久
Owner BAOTOU HUAMEI RE PRODS
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