Barium slag carbon/hydrogen cooperative reduction thermal molten-salt slag-free production process

Abstract

The invention relates to a barium slag carbon / hydrogen cooperative reduction thermal molten-salt slag-free production process, comprising: (1) heating and roasting barium slag in a rotary kiln by means of glass kiln tail gas, and feeding hydrogen for reduction by controlling material temperature to be 600-1250 DEG C, wherein the hydrogen serves as reductive gas for the barium slag in the rotary kiln and the barium slag is reduced into a thermal material; (2) adding NH4Cl water solution to the upper part of the molten salt reaction tank, and feeding the thermal material into the NH4Cl water solution through the upper part of the molten salt reaction tank to perform a reaction, wherein the temperature of the NH4Cl water solution is controlled to 60-115 DEG C, and a chlorate solid-liquid mixture is obtained and ammonia vapor and ammonium sulfide vapor are generated after the reaction; (3) discharging the reaction products from the bottom of the reaction tank into a solid-liquid separationdevice for solid-liquid separation. By means of the method, effective utilization of the barium slag is achieved, and whole-element recovery of the barium slag is completed at low cost and high efficiency. The method can achieve zero-emission of solid and liquid and very-low CO2 emission, even zero-emission of CO2, in the whole production process.

Description

technical field [0001] The invention relates to a comprehensive utilization process of barium slag, in particular to a slag-free production process of barium slag by carbon-hydrogen synergistic reduction hot-melt salt method. Background technique [0002] The processing of barium ore is mainly the production of barium salt, which is used in more than ten categories and various industries. It is people's pursuit to improve the leaching utilization rate of barium, low cost and no pollution. Barium slag is the residual solid waste produced during the production of barium salt from barium ore. It is a dangerous industrial waste. Its chemical components mainly include silicon dioxide 9-20%, residual carbon powder 15-18%, iron sulfide 1- 3%, aluminum oxide 2-6%, calcium sulfide 3-5%, barium sulfate, barium carbonate, barium silicate, barium thiosulfate 60-72% and other barium compounds. Every ton of barium salt produced will produce 0.8-1 ton of barium slag and consume 730-800 kg...

AI Technical Summary

Problems solved by technology

This method involves grinding equipment and sulfuric acid pipeline leaching process, and the heat energy utilization rate is low. Although the barium salt slag can be fully and completely utilized, the equipment investment, heat energy utilization rate, and product sales market are still unsatisfactory.

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