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Substance containing rare earth phosphate

A rare earth phosphate and material technology, applied in the field of rare earth recovery, can solve the problems of difficult mosaic dissociation, low recovery rate of rare earth, large amount of slag, etc., and achieve comprehensive recycling, high rare earth enrichment, and high grade Effect

Active Publication Date: 2017-01-11
GRIREM ADVANCED MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

(3) Phosphoric acid treatment of phosphate rock process, the rare earth-containing phosphate concentrate is mixed with phosphoric acid solution for reaction, the rare earth in the phosphate rock is precipitated in the form of fluoride by controlling the process conditions, and more than 85% of the rare earth enters the slag, and then hydrochloric acid, Nitric acid or sulfuric acid dissolves the rare earth in the recovered slag, but the rare earth grade in the slag is very low, about 1%. Large, low recovery rate of rare earth; In addition, 15% of rare earth in the leachate is easy to enter the gypsum slag during the decalcification process and is difficult to recover
When recovering rare earth elements and phosphorus elements in this mixed ore, it is difficult to achieve effective separation of ores by physical beneficiation due to the difficulty of enveloping and dissociation of various substances in the mixed ore
In particular, since the decomposition of monazite requires relatively harsh conditions, such as higher temperature and pH, etc., when using the sulfuric acid method in the prior art to wet treat phosphate rock containing monazite, it is often impossible to completely decompose monazite. can realize its effective separation and utilization

Method used

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  • Substance containing rare earth phosphate
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Experimental program
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Effect test

Embodiment 1

[0041] Be 23wt% with 1000g monazite content, the phosphate ore that total rare earth content is 16.4wt% is raw material, adopts the phosphoric acid solution (as P 2 o 5 ) Leach the monazite-containing rare earth phosphate rock, control the liquid-solid ratio of the system to 10:1, react at 10°C for 8 hours, and obtain a rare earth-containing monocalcium phosphate solution and 330g of rare earth acid leaching residue after filtration.

[0042] Place the rare earth-containing monocalcium phosphate solution at 60°C for aging treatment for 24 hours, so that the rare earth element is separated from the monocalcium phosphate solution in the form of rare earth phosphate precipitation, so that through solid-liquid separation, a monocalcium phosphate solution and 13.6 g Precipitation of rare earth phosphate.

[0043] The rare earth acid leaching residue is mixed with the rare earth phosphate precipitation to obtain a substance containing rare earth phosphate.

[0044] After testing, ...

Embodiment 2

[0046]Be that 1000g monazite content is 15wt%, the phosphate rock that total rare earth content is 11.1wt% is raw material, adopts the mixed acid solution leaching of phosphoric acid and hydrochloric acid, the mass concentration of phosphoric acid in the mixed acid is 50% (in P 2 o 5 content), the proportion of hydrochloric acid in the mixed acid solution based on the number of moles of anions is 2%, the liquid-solid ratio of the control system is 2:1, react at 60°C for 0.5h, and obtain the rare earth-containing monocalcium phosphate solution and 267g acid leaching residue.

[0047] Put the rare earth-containing monocalcium phosphate solution at 150°C for aging treatment for 0.5h, so that the rare earth element is separated from the monocalcium phosphate solution in the form of rare earth phosphate precipitation, so that through solid-liquid separation, the monocalcium phosphate solution and 18.9 g of rare earth phosphate were precipitated.

[0048] The rare earth acid leach...

Embodiment 3

[0051] Be 9.5wt with 1000g monazite content, the phosphate rock that total rare earth content is 7.4wt% is raw material, adopts the mixed acid solution leaching of phosphoric acid and hydrochloric acid, the mass concentration of phosphoric acid in the mixed acid is 30% (in P 2 o 5 content), based on the number of moles of anions, the ratio of hydrochloric acid to the mixed acid solution is 25%, the liquid-solid ratio of the control system is 8:1, react at 20°C for 1h, and obtain a rare earth-containing monocalcium phosphate solution and 205g acid leaching residue.

[0052] Place the rare earth-containing monocalcium phosphate solution at 80°C for aging treatment for 8 hours, so that the rare earth element is separated from the monocalcium phosphate solution in the form of rare earth phosphate precipitation, and thus through solid-liquid separation, a monocalcium phosphate solution and 15.6 g Precipitation of rare earth phosphate.

[0053] The rare earth acid leaching residue...

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Abstract

The invention provides a substance containing rare earth phosphate. According to the substance containing rare earth phosphate, the rare earth phosphate at least contains a first phase structure and a second phase structure, the first phase structure is an amorphous phase, and the second phase structure comprises a monazite phase or / and a xenotime phase. The rare earth containing at least two phase structures enables high enrichment degree of the rare earth in the substance containing rare earth phosphate, the grade is high, and the subsequent comprehensive recovery and utilization for the rare earth can be convenient.

Description

technical field [0001] The invention relates to the field of rare earth recovery, in particular to a substance containing rare earth phosphate. Background technique [0002] Rare earth minerals often coexist with barite, calcite, apatite, silicate ore and other minerals in nature. Due to the different mineralization reasons of minerals, the occurrence state and content of rare earth elements in minerals are also different. Among the currently mined rare earth minerals, the grade of rare earth oxides is generally a few percent. In order to meet the needs of rare earth metallurgical production, the rare earth must be separated from other ores by beneficiation before smelting, so that the rare earth minerals can be enriched. The content of rare earth oxides in the rare earth concentrate after beneficiation and enrichment is usually 50% to 70%. [0003] Rare earth minerals mainly include bastnaesite, monazite, xenotime and ion-adsorbed rare earth minerals. At present, there ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00
Inventor 王良士黄小卫巫圣喜崔大立冯宗玉董金诗赵龙胜帅庚洪龙志奇
Owner GRIREM ADVANCED MATERIALS CO LTD