Method for step-by-step extraction of phosphorus and rare earth from concentrated sulfuric acid low-temperature roasting phosphorus-containing rare earth concentrate

A rare earth concentrate, low-temperature roasting technology, applied in chemical instruments and methods, phosphorus compounds, process efficiency improvement and other directions, can solve the problems of low phosphoric acid concentration and increasing difficulty in recovery, and achieve the goal of reducing iron resources and reducing slag amount. Effect

Active Publication Date: 2020-06-30
BAOTOU RES INST OF RARE EARTHS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the phosphoric acid concentration in the water immersion solution is low, and the high concentration of RE 3+ , Fe 3+ and trace amounts of radioactive Th 4+ and so on will further increase the difficulty of recycling

Method used

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  • Method for step-by-step extraction of phosphorus and rare earth from concentrated sulfuric acid low-temperature roasting phosphorus-containing rare earth concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The mixed rare earth concentrate with a rare earth grade of 60% is mixed with concentrated sulfuric acid at a weight ratio of 1:1.8, and roasted and decomposed at 350°C to obtain roasted ore. The roasted ore is mixed with water for one leaching, the solid-to-liquid weight ratio is 1:1, the leaching time is 10 minutes, and the leaching temperature is 30°C. After filtering and washing, P 2 o 5 Phosphoric acid extraction solution and primary leaching residue with a content of 40g / L have a phosphorus extraction rate of 92%. The primary leaching residue was leached again with the dilute sulfuric acid solution with a pH value of 0.5 according to the solid-to-liquid weight ratio of 1:6. The leaching time was 3 hours and the leaching temperature was 40°C. After filtration, REO was 38g / L and the pH value was 0.4. Rare earth extract and acid leaching residue.

Embodiment 2

[0038] The monazite rare earth concentrate with a rare earth grade of 60% is mixed with concentrated sulfuric acid at a weight ratio of 1:1.7, and roasted and decomposed at 350° C. for 1 hour to obtain roasted ore. The roasted ore is mixed with water for one leaching, the solid-to-liquid weight ratio is 1:2, the leaching time is 10 minutes, and the leaching temperature is 40°C. After filtering and washing, P 2 o 5 Phosphoric acid extraction solution and primary leaching residue with a content of 21g / L have a phosphorus extraction rate of 95%. The primary leaching residue was leached again with dilute sulfuric acid solution with a pH value of 1 according to the solid-to-liquid weight ratio of 1:6. The leaching time was 3 hours and the leaching temperature was 50°C. After filtration, REO was 35g / L and pH value was 0.8. Rare earth extract and acid leaching residue.

Embodiment 3

[0040] The mixed rare earth concentrate with a rare earth grade of 60% is mixed with concentrated sulfuric acid at a weight ratio of 1:1.6, and roasted and decomposed at 300°C for 1 hour to obtain roasted ore. The roasted ore is mixed with water for one leaching, the solid-to-liquid weight ratio is 1:0.4, the leaching time is 30 minutes, the leaching temperature is 20°C, and P is obtained after filtration and washing. 2 o 5Phosphoric acid extraction solution and primary leaching residue with a content of 91g / L have a phosphorus extraction rate of 85%. The primary leaching residue was leached again with dilute sulfuric acid solution with a pH value of 2 according to the solid-to-liquid weight ratio of 1:10. The leaching time was 1 hour, and the leaching temperature was 60°C. After filtration, REO was 24g / L and pH value was 0.3 Rare earth extract and acid leaching residue.

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Abstract

The invention discloses a method for stepwise extraction of phosphorus and rare earth in phosphorus-containing rare earth concentrate through low-temperature roasting by concentrated sulfuric acid. The method comprises: uniformly mixing phosphorus-containing rare earth concentrate and concentrated sulfuric acid according to a ratio, carrying out calcining decomposition at 200-350 DEG C to obtain calcined ore, blending the calcined ore and water, carrying out primary leaching, carrying out filtration and washing to obtain phosphoric acid extract and primary residues, carrying out secondary leaching on the primary residues and a dilute sulfuric acid solution and carrying out filtration and washing to obtain rare earth extract and water leaching residues. The method utilizes the principle ofdifference in solubility of iron phosphate, rare earth phosphate and strontium phosphate and the diffusion rate of rare earth sulfate and phosphoric acid under acidic conditions to extract phosphoricacid step by step, realizes preliminary separation with rare earth and solves the problems in the prior art. .

Description

technical field [0001] The invention relates to a hydrometallurgical technology, in particular to a method for extracting phosphorus and rare earth step by step by roasting concentrated sulfuric acid at low temperature and containing phosphorus rare earth concentrate. Background technique [0002] The rare earth minerals in the world are mainly divided into three types: bastnaesite, monazite and weathering crust leaching type rare earth minerals. Among them, the monazite mineral (REPO 4 ) are phosphorus-containing rare earth minerals, which contain rich phosphorus resources in addition to rare earth resources. At present, the concentrated sulfuric acid decomposition process is mainly used to extract rare earths from phosphorus-containing rare earth concentrates, and the concentrated sulfuric acid decomposition process is divided into high temperature and low temperature. In the high-temperature roasting process of concentrated sulfuric acid, the iron in the concentrate and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/06C22B3/08C22B59/00C01B25/222
CPCC01B25/222C22B1/06C22B3/08C22B59/00Y02P10/20
Inventor 崔建国侯睿恩王哲张丽郝肖丽高婷申孟林孟志军
Owner BAOTOU RES INST OF RARE EARTHS
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