Method for continuously preparing hydrogen sulfide and coproducing nano barium sulfate through microreactor

A nano-barium sulfate and microreactor technology, applied in hydrogen sulfide, chemical instruments and methods, sulfur compounds, etc., can solve the problems of low added value, low quality and high cost of barium sulfate products, and achieve better economy, The effect of easy industrial production and stable quality

Pending Publication Date: 2018-12-21
GUIZHOU MICRO CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Relying on cheap barium sulfide mineral resources, the reaction of barium sulfide and sulfuric acid to prepare hydrogen sulfide is usually carried out in a stirred tank. When hydrogen sulfide is produced, barium sulfate is produced as a by-product. However, the obtained barium sulfate product has low quality and low added value, resulting in At present, the cost of using hydrogen sulfide as a precipitant is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method utilizing a microreactor to continuously prepare hydrogen sulfide and co-produce nanometer barium sulfate, comprising the steps of:

[0018] (1) Dissolve barium sulfide in a dissolution tank at a temperature of 60°C. After filtering and desalinated solution, a 0.5mol / L barium sulfide solution is obtained, which is stored in storage tank A; put industrial sulfuric acid in storage tank B Prepare 0.5mol / L sulfuric acid solution;

[0019] (2) The barium sulfide solution in storage tank A and the sulfuric acid solution in storage tank B are pumped into the T-type microreactor through a metering pump at a molar ratio of 1:1. The equivalent diameter of the microreactor is 1 μm, and the reaction temperature is 60 °C to obtain barium sulfate slurry and hydrogen sulfide gas;

[0020] (3) The escaped hydrogen sulfide gas is collected and stored in a buffer gas tank, which is directly used for the precipitation and recovery of heavy metals in non-ferrous metallurgical was...

Embodiment 2

[0022] A method utilizing a microreactor to continuously prepare hydrogen sulfide and co-produce nanometer barium sulfate, comprising the steps of:

[0023] (1) Dissolve barium sulfide in a dissolution tank at a temperature of 75°C. After filtering and desalinated solution, a 1mol / L barium sulfide solution is obtained and stored in storage tank A; industrial sulfuric acid is prepared in storage tank B into a 1mol / L sulfuric acid solution;

[0024] (2) The barium sulfide solution in storage tank A and the sulfuric acid solution in storage tank B are pumped into the Y-type microreactor through a metering pump at a molar ratio of 1:1.05. The equivalent diameter of the microreactor is 250 μm, and the reaction temperature is 75 °C to obtain barium sulfate slurry and hydrogen sulfide gas;

[0025] (3) The escaped hydrogen sulfide gas is collected and stored in a buffer gas tank, which is directly used for the precipitation and recovery of heavy metals in non-ferrous metallurgical w...

Embodiment 3

[0027] A method utilizing a microreactor to continuously prepare hydrogen sulfide and co-produce nanometer barium sulfate, comprising the steps of:

[0028] (1) Dissolve barium sulfide in a dissolution tank at a temperature of 90°C. After filtering and desalinated solution, a 2mol / L barium sulfide solution is obtained and stored in storage tank A; industrial sulfuric acid is prepared in storage tank B into a 2mol / L sulfuric acid solution;

[0029] (2) The barium sulfide solution in the storage tank A and the sulfuric acid solution in the storage tank B are pumped into the collision flow microreactor by a metering pump at a molar ratio of 1:1.1. The equivalent diameter of the microreactor is 500 μm, and the reaction temperature is at 90°C to obtain barium sulfate slurry and hydrogen sulfide gas;

[0030] (3) The escaped hydrogen sulfide gas is collected and stored in a buffer gas tank, which is directly used for the precipitation and recovery of heavy metals in non-ferrous met...

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Abstract

The invention discloses a method for continuously preparing hydrogen sulfide and coproducing nano barium sulfate through a microreactor. The method comprises the following steps: dissolving barium sulfide in a dissolving tank at the temperature of 60-90 DEG C; filtering, and preparing a solution from desalted water to obtain a 0.5-2mol/L barium sulfide solution; storing into a storing tank A; preparing a 0.5-2mol/L sulfuric acid solution from industrial sulfuric acid in a storing tank B; pumping the barium sulfide solution in the storing tank A and the sulfuric acid solution in the storing tank B into the microreactor based on the molar ratio of 1: (1-1.1); and reacting at the temperature of 60-90 DEG C to obtain barium sulfide slurry and hydrogen sulfide; collecting the overflowing hydrogen sulfide and storing in a buffering gas tank; filtering the barium sulfide slurry; washing and separating with the desalted water; and performing spray drying at the temperature of 110-150 DEG C toobtain the nanobarium sulfate powder. With the adoption of the method, the hydrogen sulfide can be continuously produced; the cost is low; and the quality is stable.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and specifically relates to a method for continuously preparing hydrogen sulfide and co-producing nanometer barium sulfate by using a microreactor. Background technique [0002] In the non-ferrous metallurgical industry, there is a large amount of metallurgical wastewater, especially the composition of the hydrometallurgical process wastewater is very complex and the content of heavy metals is high. Hydrogen sulfide is a very good precipitant, which has good selectivity to heavy metal ions and can better precipitate heavy metal ions in copper hydrometallurgy. The traditional method of treating heavy metal ions in hydrometallurgy is to use soda lime, sodium sulfide, etc. as precipitants, which produces a lot of waste residue, large solid waste discharge, and high post-treatment costs, which bring great environmental pressure and economic pressure to enterprises. The use of hydrogen su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46B82Y40/00C01B17/16
CPCB82Y40/00C01B17/165C01F11/462C01P2004/64
Inventor 禹志宏伍廷鑫王贵城卫炎勋张清坤
Owner GUIZHOU MICRO CHEM TECH CO LTD
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