METHOD OF EXTRACTING GERMANIUM FROM GERMANIUM DEPOSIT USING THERMAL REDUCTION PROCESS

摘要

A method of extracting germanium from a germanium deposit using a thermal reduction process is disclosed. The present disclosure relates to a method of extracting germanium, which belongs to the field of metallurgy technologies of nonferrous metal, and particularly relates to a method of extracting germanium from a germanium deposit through thermal reduction, volatilization and concentration using sodium monophosphate as a reducing agent. The method of the present disclosure includes: adding sodium monophosphate to a germanium deposit; isolating from air; increasing the temperature and baking the germanium deposit; and obtaining a germanium concentrate after volatilization and concentration of the germanium deposit. Through baking the germanium deposit at 1,000° C., volatilization and concentration of the germanium deposit, the germanium recycling rate exceeds 96% when sodium monophosphate weighing 2.5% of the germanium depositis added. The present disclosure solves the following problems in the prior arts: existing pyrogenic methods for concentrating and extracting germanium from germanium deposits can hardly achieve a germanium recycling rate of greater than 75%; secondary pyrogenic recycling methods for extracting germanium slag have excessively high production cost and yield low germanium recycling rates; and the cost of hydrometallurgical treatment methods for low-grade germanium concentrates is too high.

主权项

1. A method of extracting germanium from a germanium deposit using a thermal reduction and volatilization process, comprising the steps of:
Step 1): taking a germanium deposit having a particulate diameter of less than 1 cm, taking sodium monophosphate crushed to 120 meshes or more and accounting for 2.5%-7.5% of a weight of the germanium deposit, dissolving the sodium monophosphate with water having a weight of 0.1-0.5 time of the germanium deposit to obtain a solution, and uniformly mixing the solution with the germanium deposit; and Step 2): placing uniformly mixed germanium deposit in a Muffle furnace or a novel pyrogenic germanium extracting device preheated to 900° C.-1,000° C., closing a furnace door to be isolated from air, after increasing a temperature in the Muffle furnace or the novel pyrogenic germanium extracting device to 1,000° C. -1,100° C., baking at a constant temperature for 1-2 hour(s) for volatilizing and concentrating such that germanium is concentrated in volatilized smog, and collecting the smog that enters into a smog-collecting bag to obtain a germanium concentrate.