Process method for smelting and separating uranium, thorium and rare earth from monazite concentrate

Abstract

The invention provides a process method for smelting and separating uranium, thorium and rare earth from monazite concentrate. The process method comprises the following steps that the monazite concentrate is used as a raw material, the steps of crushing by wet ball mill and iron removal by magnetic separation, alkali decomposition transformation, preparation of trisodium phosphate product, alkalicake adding hydrochloric acid for solubilization, preparation of rare earth chloride mixture product, adding hydrochloric acid to optimal solution slag for full dissolution, extraction of uranium byamines and preparation of uranium products, extraction of thorium by acidic phosphorus containing compounds and preparation of crude thorium products and wastewater treatment are adopted, and the recovery rate of valuable resources such as uranium, thorium, rare earth is greater than 95%. After the thorium is extracted, the raffinate water phase is returned to the optimal solution to recover the rare earth chloride mixture, most of the production process water is directly returned and recycled, and a small part of wastewater is returned to the system for utilization after comprehensive treatment, so that zero discharge of the wastewater is realized. The process is reliable, the chemical materials are common, and the consumption is low. The use of solitary stone resources is ensured for green, environmental protection, efficient and clean production, and the process method has obvious social benefits and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of uranium and thorium recovery, in particular to a process for smelting and separating uranium, thorium and rare earth from monazite concentrate. Background technique [0002] Monazite is a phosphate mineral of rare earth and thorium and uranium. It is one of the important rare earth minerals and the earliest rare earth mineral to be used in industry. Monazite concentrate smelting, separation and recovery of rare earth chloride mixture generally adopts the process of first alkali decomposition and then hydrochloric acid to extract the rare earth chloride mixture, but the recovery rate of rare earth is low, and valuable resources such as uranium and thorium have not been recovered and utilized. , The discharge of waste water is large and difficult to meet the discharge standards, and the amount of waste residue is large and cannot be properly preserved. It does not meet the relevant provisions of the safety ...

AI Technical Summary

Problems solved by technology

In the process of traditional monazite concentrate smelting, separation and recovery of rare earth chloride mixture, because valuable resources such as uranium and thorium have not been comprehensively recovered, existing monazite processing enterprises will produce a large amount of excellent molten slag, which is excellent Radioactive nuclides such as uranium and thorium in the molten slag are discarded, seriously endangering the ecological environment

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