Method for comprehensive recovery of phosphor and rare earth from monazite-containing phosphate rock

Abstract

The present invention discloses a method for comprehensive recovery of phosphor and rare earth from monazite-containing phosphate rock. The method comprises the following steps: a rare-earth-containing monocalcium phosphate solution and monazite-containing slag are obtained by leaching of the monazite-containing phosphate rock with phosphoric acid and solid-liquid separation; an extractant organic solution is added into the rare-earth-containing monocalcium phosphate solution for extraction and recovery of the rare earth in the monocalcium phosphate solution, and a monocalcium-phosphate-containing extraction raffinate is obtained; the rare earth in the monazite-containing slag is recovered, and the phosphor in the monocalcium-phosphate-containing extraction raffinate is recovered. According to the method, on the basis of the characteristics that decomposition conditions of the monazite-containing phosphate rock are harsher than that of phosphate rock due to the structural features of monazite and other rare-earth minerals which are difficult to decompose, the phosphoric acid is used for leaching treatment of the monazite-containing phosphate rock to dissolve the phosphate rock to produce monocalcium phosphate (Ca (H2PO4) 2) to entering the liquid phase, so that phosphorite and the monazite are separated. By respective recovery of the rare earth in the monocalcium phosphate solution and the rare earth in the monazite-containing solid slag, the rare earth recovery rate is improved.

Description

technical field [0001] The invention relates to the field of rare earth recovery, in particular to a method for comprehensively recovering phosphorus and rare earth from monazite-containing phosphate rock. 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. In the rare earth-containing ores currently mined, the content of rare earth oxides is only a few percent, or even lower. 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 minerals enriched by ore dressing can reach more than 60%-70%. Minerals enriched with rare earths are usually called rare earth concentrates...

AI Technical Summary

Problems solved by technology

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 recycling

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