A comprehensive recovery process of rare earth and strontium co-associated polymetallic ore

Abstract

The present invention relates to a comprehensive recovery process for a rare earth and strontium intergrowth multi-metal ore. The mineral mainly comprises rare earth fluoro-carbonate and at least one selected from a sulfate of the strontium, a carbonate of the strontium or a strontium oxide. According to the present invention, at least one method selected from gravity separation, magnetic separation and flotation separation is adopted to carry out concurrent screening for the rare earth and the strontium in the rare earth and strontium intergrowth multi-metal ore to obtain the bulk concentrate containing the rare earth and the strontium; then the bulk concentrate is subjected to oxidizing roasting for 1-8 hours at a temperature of 350-700 DEG C in air atmosphere or oxygen atmosphere; the resulting calcine is subjected to leaching for 1.0-5.0 hours by a sulfuric acid solution with the hydrogen ion concentration of 0.5-12.0 mol / L, wherein the leaching temperature is 20-100 DEG C, the leaching liquid-solid ratio (by weight) is 1-5:1. The comprehensive recovery process of the present invention has the following advantages that: the rare earth is almost entirely leached in the solution; the strontium sulfate (SrSO4) is remained in the residue; the strontium concentrate with the grade of about 70% is obtained, and can be sold directly or deep processed; with the comprehensive recovery process of the present invention, the multi-metal ore containing the rare earth and the strontium can be effectively separated.

Description

technical field [0001] The invention relates to a comprehensive recovery process of rare earth and strontium co-associated polymetallic ores, in particular to a comprehensive separation and recycling of bastnaesite and strontium-containing minerals, fluorite, barium and other co-associated ores. Specifically, rare earth and strontium-containing polymetallic ores are used as raw materials, and the rare earth sulfate solution is obtained by oxidation roasting and sulfuric acid leaching. The rare earth sulfate solution is extracted and separated or the double salt precipitation-alkali conversion method is used to achieve rare earth, thorium, and fluorine. The form of the product is recovered, and the main component of the leaching slag is a strontium mineral product in the form of strontium sulfate. Background technique [0002] Rare earth is my country's dominant mineral and a strategic material. my country's rare earth reserves account for more than 80% of the world. After ...

AI Technical Summary

Problems solved by technology

In this method, during the oxidation roasting-hydrochloric acid leaching process, part of the rare earths will be recovered in the form of chloride solution, which can be directly connected to the extraction and separation of rare earths, but some rare earths will enter the leaching residue together with celestite in the form of fluorine compounds or oxyfluorides, and If strontium in the ore exists in the form of strontium carbonate or strontium oxide, strontium will form strontium chloride and enter the leach solution, causing strontium to disperse in the leach solution and slag, making it difficult to separate and recover from rare earths

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