Method for recovering rare earth from rare-earth-contained phosphorite

Abstract

The invention discloses a method for recovering rare earth from rare-earth-contained phosphorite, which relates to the method for recovering the rare earth from phosphorite and is characterized by comprising the following steps: mixing a rare-earth-contained phosphate concentrate with a phosphoric acid solution for stirring reaction; immersing the rare earth into the solution; carrying out solid-liquid separation to obtain a rare-earth-contained phosphoric acid solution; then, separating and recovering the rare earth from the rare-earth-contained phosphoric acid solution through uniting one or several of an extraction method, an ion exchange adsorption method, a precipitation method and a crystallization method; and enabling the phosphoric acid solution after slag is leached and the rare earth is separated and recovered to enter a wet-process phosphoric acid production system to produce a phosphoric acid. In the method for recovering the rare earth from the rare-earth-contained phosphorite, by taking the phosphoric acid solution as a leaching agent, the rare earth is extracted from the rare-earth-contained phosphorite without adding a surface active agent, thereby, the quality of a phosphoric acid product is not influenced, and the rare-earth leaching rate is about as high as 90 percent, and moreover, the leaching agent for leaching the rare earth is the phosphoric acid generated in the phosphoric acid production course, and can also be circular dilute phosphoric acid, diluted phosphoric acid and the like generated in the phosphoric acid production course. The method for recovering the rare earth from the rare-earth-contained phosphorite is tightly linked with a sulfuric acid-method phosphoric acid production process.

Description

technical field [0001] The invention relates to a method for recovering rare earth from phosphate rock containing rare earth, relating to a method for recovering rare earth from phosphate rock. Background technique [0002] The total proven reserves of rare earth resources in the world are 45 million tons (calculated as oxides), relatively concentrated in China, the United States, India, Australia, the former Soviet Union and other countries. [0003] Rare earth endogenous deposits are mainly produced in alkaline rocks and carbonatites, and are concentrated in several deposits in Baiyun Obo in China, Mountain Pass in the United States, and Weld Mountain in Australia. According to the annual reserve statistics, these three mines account for more than 90% of the world's total rare earth reserves. [0004] In addition, a large amount of rare earth resources are also associated with phosphate rock. The total reserves of phosphate rock in the world are about 100 billion tons. A...

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Problems solved by technology

[0009] In short, the problems in the process of recovering trace rare earths from phosphate rock are: although it is technically feasible to extract rare earths from phosphogypsum, the process is very complicated and there are great difficulties in economy; In the case of adding additives, the leaching rate of rare earths is very low due to the adsorption of phosphogypsum, and the leaching rate of rare earths is below 30%. Although the addition of additives can increase the leaching rate of rare earths, it will increase the cost, and the additives will affect the production of phosphoric acid and phosphoric acid products. Quality constitutes an impact

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