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Calcium sulfide-based slow-release vulcanizing agent as well as preparation method and application thereof

A technology of calcium sulfide and vulcanizing agent, which is applied in the field of calcium sulfide-based slow-release vulcanizing agent, preparation of calcium sulfide-based slow-release vulcanizing agent, and slow-release vulcanizing agent. , secondary pollution and other issues, to avoid the generation of harmful hydrogen sulfide gas, which is conducive to large-scale production and high utilization rate

Active Publication Date: 2021-09-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the fact that calcium sulfide is used as a vulcanizing agent in the prior art in the process of purifying heavy metal ions in polluted acid by the vulcanization method, the release rate of sulfur anions is difficult to control, the utilization rate of the vulcanizing agent is low, and some H 2 The escape of S gas causes secondary pollution and other problems. The first purpose of the present invention is to provide a kind of active substance calcium sulfide coated and modified with zeolite and paraffin, which can realize the slow release of sulfur under acidic conditions. Negative ions, a calcium sulfide-based slow-release vulcanizing agent that can achieve deep purification of heavy metal ions in polluted acid. The calcium sulfide-based slow-release vulcanizing agent is low in cost and can control the release rate of sulfur anions, which can improve the utilization of calcium sulfide resources and reduce hydrogen sulfide. The environmental pollution caused by the escape has economic feasibility and green development, and is suitable for large-scale industrial promotion

Method used

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  • Calcium sulfide-based slow-release vulcanizing agent as well as preparation method and application thereof
  • Calcium sulfide-based slow-release vulcanizing agent as well as preparation method and application thereof
  • Calcium sulfide-based slow-release vulcanizing agent as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The concentration of arsenic in the sewage acid of a lead-zinc smelter in Hunan is 2g / L, the concentration of zinc ions is 0.7g / L, the concentration of lead ions is 100mg / L, and the concentration of copper ions is 60mg / L.

[0029] First, melt the paraffin wax at 70°C, then add calcium sulfide and zeolite according to the mass ratio of paraffin wax, zeolite and calcium sulfide 1.5:3:5.5, stir for 20 minutes, pour into a mold for condensation. Ethyl cellulose and stearic acid were fully dissolved in a small amount of ethanol according to the mass percentage of 8% and 3% respectively to prepare a uniform coating solution. The coating solution is evenly sprayed on the surface of the condensed solid particles to obtain the calcium sulfide slow-release agent. Add the calcium sulfide slow-release agent into the acidic solution, the added calcium sulfide slow-release agent is 1.1 times the theoretical amount, stir for 40 minutes, and control the reaction temperature at 45°C. Af...

Embodiment 2

[0041] The concentration of arsenic in the sewage acid of a zinc smelter in Hunan is 30.3mg / L, the concentration of zinc ions is 450mg / L, the concentration of cadmium ions is 30.6mg / L, and the concentration of copper ions is 4.7mg / L.

[0042] first. Melt the paraffin wax at 70°C, then add calcium sulfide and zeolite according to the mass ratio of paraffin wax, zeolite and calcium sulfide 1.5:3.5:5, stir for 20 minutes, pour into a mold for condensation. In addition, ethyl cellulose and stearic acid were fully dissolved in ethanol according to the addition amount of 10% and 4% by mass respectively to prepare a uniform coating solution. The coating solution is evenly sprayed on the surface of the condensed solid particles to obtain the calcium sulfide slow-release agent. Add the calcium sulfide slow-release agent to the sewage acid, the added calcium sulfide slow-release agent is 1.15 times the theoretical amount, stir and react for 40 minutes, the reaction temperature is contr...

Embodiment 3

[0055] The concentration of arsenic in the sewage acid of a zinc smelter in Hunan is 45.3mg / L, the concentration of zinc ions is 330mg / L, the concentration of lead ions is 22mg / L, and the concentration of copper ions is 8.0mg / L.

[0056] first. Melt the paraffin wax at 70°C, then add calcium sulfide and zeolite according to the mass ratio of paraffin wax, zeolite and calcium sulfide 1:3:6, stir for 25 minutes, pour into a mold for condensation. In addition, ethyl cellulose and stearic acid were fully dissolved in ethanol according to the addition amount of 10% and 4% by mass respectively to prepare a uniform coating solution. The coating solution is evenly sprayed on the surface of the condensed solid particles to obtain the calcium sulfide slow-release agent. Add the calcium sulfide slow-release agent to the sewage acid, the added calcium sulfide slow-release agent is 1.2 times the theoretical amount, stir and react for 45 minutes, the reaction temperature is controlled at 4...

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Abstract

The invention discloses a calcium sulfide-based slow-release vulcanizing agent as well as a preparation method and application thereof. The preparation method comprises the following steps: uniformly mixing molten paraffin with zeolite particles and calcium sulfide particles, carrying out auxiliary cooling molding through a mold to obtain solid particles, spraying a coating liquid containing ethyl cellulose and stearic acid on the surfaces of the solid particles, and volatilizing a solvent at room temperature to obtain the calcium sulfide-based slow-release vulcanizing agent. The calcium sulfide-based slow-release vulcanizing agent can stably slowly release, vulcanize and deeply precipitate heavy metal ions in an acid solution system, is high in utilization rate, can avoid secondary pollution caused by H2S escape, is particularly suitable for purifying the heavy metal ions in an acid solution, and is simple and efficient in preparation process, low in raw material cost, and large-scale production and application are facilitated.

Description

technical field [0001] The present invention relates to a slow-release vulcanizing agent, in particular to a calcium sulfide-based slow-release vulcanizing agent, a preparation method of a calcium sulfide-based slow-release vulcanizing agent, and a calcium sulfide-based slow-release vulcanizing agent containing heavy metal ions in an acidic solution system The application of sulfide precipitation belongs to the technical field of non-ferrous metal smelting. Background technique [0002] In 2019, the production capacity of China's top ten non-ferrous metals, including copper, aluminum, lead, zinc, nickel, antimony, and magnesium, reached 58.416 million tons, ranking first in the world in non-ferrous metal output. At the same time, during the smelting process of non-ferrous metals, a large amount of acidic wastewater (that is, dirty acid) containing toxic heavy metal ions such as arsenic, copper, cadmium, and zinc will be produced. Sewage and wastewater containing heavy non-f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D21/01
CPCB01D21/01
Inventor 韩俊伟覃文庆刘维焦芬魏徐一杨聪仁魏茜
Owner CENT SOUTH UNIV
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