A process 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, using monazite concentrate as raw material, adopting wet bead mill crushing, magnetic separation to remove iron, alkali decomposition transformation, trisodium phosphate Product preparation, alkali cake plus hydrochloric acid excellent solution, rare earth chloride mixture product preparation, high-quality molten slag plus hydrochloric acid full solution, amine extraction and extraction of uranium and uranium product preparation, acidic phosphorus-containing extraction of thorium and crude thorium product preparation, waste water Treatment and other steps make the recovery rate of uranium, thorium, rare earth and other valuable resources greater than 95%. After extracting thorium, the raffinate water phase is returned to the excellent solution to recover the rare earth chloride mixture. Most of the production process water is directly returned for recycling, and a small part of the wastewater is returned to the system for utilization after comprehensive treatment to achieve zero discharge of wastewater. The invention has reliable process technology, common chemical materials and low consumption. Guaranteeing the use of monazite resources in a green, efficient and clean production has obvious social 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

Images