Method for extracting and separating cerium, fluorine and phosphorus from sulfuric acid leaching solution of Baotou rare earth mine

Abstract

The invention relates to a method for extracting and separating cerium, fluorine and phosphorus from a sulfuric acid leaching solution of a Baotou rare earth mine. According to the method, recycling of the fluorine (F) and recycling of the phosphorus (P) in the Baotou rare earth mine are achieved at the same time through a solvent extraction method. A sulfuric acid rare earth solution serves as a raw material solution, and the sulfuric acid rare earth solution is obtained by conducting oxidizing roasting and sulfuric acid leaching on the Baotou rare earth mine, and the sulfuric acid rare earth solution can also be obtained by conducting liquid alkali decomposition, wet air oxidation and sulfuric acid leaching on the Baotou rare earth mine; the cerium, the fluorine and the phosphorus are separated through the solvent extraction method under proper process conditions, and recycling of F and recycling of P in the Baotou rare earth mine are achieved at the same time; the method is simple in process procedure and high in yield, the concomitant F resources and P resources are recycled, and the process method is clean. The recovery rate of cerium (IV) in the process reaches over 95%, the extraction recovery rate of F reaches over 93%, and the extraction recovery rate of P is over 95%; the content of CeO2 / REO in obtained CeO2 products and mixed micro powder of CeF3 and CePO4 reaches 99-99.9999%, and the content of ThO2 / TCeO is less than 0.01%.

Description

technical field [0001] The invention relates to a separation method, in particular to a method for extracting and separating cerium, fluorine and phosphorus from sulfuric acid leaching solution of Baotou rare earth mine. Background technique [0002] Baotou is rich in rare earth resources, accounting for more than 90% of the country's total rare earth reserves, and Baotou rare earth concentrates account for more than 60% of my country's smelting rare earth concentrates. Therefore, many people in the prior art have studied the process of extracting rare earth elements from Baotou rare earth concentrate. Since cerium is the most widely used rare earth element, many studies have been made on the separation of cerium and other elements from Baotou rare earth concentrate. Usually, the method of separating cerium and other elements is to oxidize trivalent cerium in cerium-containing minerals or other cerium-containing mixtures to tetravalent cerium, then add acid solution for lea...

AI Technical Summary

Problems solved by technology

Gupta et al. reported that the acidic extraction system has a large amount of acid-base consumption during the extraction and stripping process, and the extraction cost is higher than that of the neutral extraction (C.K.Guptaet.al.,Extractivemetalluryofrareearths,BocaRatonLondonNewYorkWashington,D.C.,2005,p183)

However, there is no report so far that proposes to realize the recovery of F and P in Baotou rare earth ore simultaneously by means of solvent extraction.