Method for selectively extracting non-cerium rare earth in mixed rare earth concentrate

A mixed rare earth, selective technology, applied in the field of hydrometallurgy, can solve the problems of non-reuse, difficult to recycle, etc.

A mixed rare earth, selective technology, applied in the field of hydrometallurgy, can solve the problems of non-reuse, difficult to recycle, etc.

CN109161702BActive Publication Date: 2020-10-23BAOTOU RES INST OF RARE EARTHS +1
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  • Method for selectively extracting non-cerium rare earth in mixed rare earth concentrate

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Effect test

Embodiment 1

[0027] 100g bastnaesite and monazite mixed rare earth concentrate (REO: 64.0%, P 2 o 5 : 6.8%) was oxidized and roasted in air at 550° C. for 1 hour to form 85 g of oxidized roasted ore. The roasted ore was uniformly mixed with 68 g of concentrated sulfuric acid with a mass percentage of 98%, and then roasted at 150°C for 2 hours. The formed sulfuric acid roasted ore and water are in a weight ratio of 1:5, and the sulfuric acid roasted ore is soaked in water to adjust slurry and separate from solid and liquid to obtain 590ml of cerium-less rare earth sulfate solution and cerium phosphate enrichment, cerium-less rare earth sulfate solution ThO 2 0.2g / L, CeO 2 The dissolution rate was 48.0%, P 2 o 5 The dissolution rate was 9.4%.

Embodiment 2

[0029] 100g bastnaesite and monazite mixed rare earth concentrate (REO:52.0%, P 2 o 5 : 8.9%) were oxidized and roasted in air at 400°C for 3 hours. The formed 82.7g oxidized roasted ore was mixed evenly with 74.4g of 92% concentrated sulfuric acid by mass percentage, and then roasted at 600° C. for 1 hour. The formed sulfuric acid roasted ore and water are in a weight ratio of 1:6, and the sulfuric acid roasted ore is soaked in water for slurry adjustment and solid-liquid separation to obtain 730ml of cerium-less rare earth sulfate solution and cerium phosphate enrichment, cerium-less rare earth sulfate solution ThO 2 2 The dissolution rate was 20.0%, P 2 o 5 The dissolution rate was 3.2%.

Embodiment 3

[0031] 100g bastnaesite and monazite mixed rare earth concentrate (REO:63.5%, P 2 o 5 : 8.8%) was oxidized and roasted in air for 1 hour at 650°C to form 86.5g of oxidized roasted ore. The oxidized roasted ore was uniformly mixed with 103.8 g of concentrated sulfuric acid with a mass percentage of 85%, and then roasted at 300° C. for 1.5 hours. The formed sulfuric acid roasted ore and water are in a weight ratio of 1:7, and the sulfuric acid roasted ore is soaked in water for slurry adjustment and solid-liquid separation to obtain 880ml cerium-less rare earth sulfate solution and cerium phosphate enrichment, cerium-less rare earth sulfate solution ThO 2 0.18g / l, CeO 2 The dissolution rate was 37.8%, P 2 o 5 The dissolution rate was 6.8%.

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Abstract

The invention discloses a method for selectively extracting non-cerium rare earth from mixed rare earth ore concentrate. The method comprises the following steps: performing air oxidation roasting onmixed rare earth ore concentrate containing bastnaesite and monazite at 400-650 DEG C for 1-3 h to generate thermal oxidation roasted ore; oxidizing trivalent cerium in the mixed rare earth ore concentrate into tetravalent cerium; uniformly mixing the thermal oxidation roasted ore and concentrated sulfuric acid and roasting the mixture at the low temperature of 150-800 DEG C for 0.5-2 h, and dissolving the oxidation roasted ore in concentrated sulfuric acid to form cerium phosphate and trivalent rare earth sulfate; performing water soaking and size mixing on cerium phosphate and trivalent rareearth sulfate, and performing solid-liquid separation to obtain a little-cerium rare earth sulfate solution and a cerium phosphate enriched product. Technical advantages that high-valent cerium is formed from bastnaesite by oxidation roasting and phosphoric acid is formed from monazite by sulfuric acid decomposition are fully combined, and fixation of cerium and phosphorus resources and selectiveexploitation of non-cerium rare earth are realized by high-stability cerium phosphate.

Description

technical field [0001] The invention relates to a hydrometallurgy technology, in particular to a method for selectively extracting non-cerium rare earths from mixed rare earth concentrates. Background technique [0002] Baiyun Obo Mine is the largest rare earth mine in my country. Rare earth minerals are mainly composed of bastnaesite and monazite, which are recognized as refractory minerals in the world. In the current production process, the high-temperature roasting decomposition process of concentrated sulfuric acid and the decomposition process of concentrated alkali solution are mainly used. In recent years, the treatment of "three wastes" in the rare earth concentrate smelting industry and the comprehensive utilization of fluorine, phosphorus and other resources have become research hotspots. The mineral disposal methods formed are almost all the integration and improvement of the past smelting process. Although they have their own characteristics, they are all It i...

Claims

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Application Information

Patent Timeline
23 Oct 2020
Publication
CN109161702B
IPC
C22B59/00; C22B1/02; C22B1/06; C22B3/04
CPC
C22B1/02; C22B1/06; C22B3/04; C22B59/00; Y02P10/20
Inventors
崔建国; 王哲