Method for producing zinc sulfide by acidic waste gas

A technology of acid waste gas and zinc sulfide, applied in the direction of zinc sulfide, chemical instruments and methods, separation methods, etc., can solve problems such as inconvenience

Inactive Publication Date: 2019-12-10
弘润石化(潍坊)有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In summary, there are obviously inconveniences and defect...

Method used

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  • Method for producing zinc sulfide by acidic waste gas

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Embodiment 1

[0042] Industrial zinc sulfate is dissolved in water to make about 1.70mol / L. After the infusion pump of the liquid supply system is filtered by a multi-stage filter, it is purified in the channel. Under heating, heat to 65°C to reach the reaction temperature. After the zinc sulfate solution enters the reaction kettle, hydrogen sulfide gas is introduced, and the zinc sulfate and hydrogen sulfide react fully under the stirring condition. Add water to wash. Aging: Aging is carried out on the powder slurry after water washing, and it is heated and kept at 90-93°C for about 150 minutes to improve the crystallinity of zinc sulfide, so that zinc sulfide shows special particle size distribution and dispersibility effects. The matured slurry is introduced into the post-water washing tank to wash away impurities such as sulfate in the crystal. Filter out mechanical impurities through a water sieve machine, and then guide the slurry into a dehydrator for dehydration. The dehydrated p...

Embodiment 2

[0044]2# Zinc oxide reacts with industrial sulfuric acid and dissolves in water to make about 1.70mol / L. After the infusion pump of the liquid supply system is filtered by a multi-stage filter, it is purified in the channel, and the impurities <15μm in the droplet are filtered. , The solution was heated to 65°C under 0.4Mpa steam heating to reach the reaction temperature. After the zinc sulfate solution enters the reaction kettle, hydrogen sulfide gas is introduced, and the zinc sulfate and hydrogen sulfide react fully under the stirring condition. Add water to wash. Aging: Aging is carried out on the washed powder slurry, which is heated at 90-93°C for about 150 minutes to improve the crystallinity of zinc sulfide, so that zinc sulfide shows a special effect of particle size distribution and dispersibility. The matured slurry is introduced into the post-water washing tank to wash away impurities such as sulfate in the crystal.

[0045] Filter out mechanical impurities, etc....

Embodiment 3

[0047] 1# Zinc oxide is reacted with refined pure sulfuric acid, dissolved in water to make about 1.70mol / L, filtered by multi-stage filters through the infusion pump of the liquid supply system, and then purified in the channel, and the impurities <15μm in the droplets After being filtered, the solution is heated to 65°C under 0.4Mpa steam heating to reach the reaction temperature. After the zinc sulfide solution enters the reaction kettle, hydrogen sulfide gas is introduced, and the zinc sulfate and hydrogen sulfide react fully under the condition of stirring. Add water to wash. Aging: Aging is carried out on the powder slurry after washing, and it is heated and kept at 90-93°C for about 150 minutes to improve the crystallinity of zinc sulfide, so that zinc sulfide shows a special particle size distribution and dispersibility effect. The matured slurry is introduced into the post-water washing tank to wash away impurities such as sulfate in the crystal. Filter out mechanic...

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Abstract

The invention provides a method for producing zinc sulfide by acidic waste gas. The method comprises the steps: preparing a zinc sulfate solution with the molar concentration of 1.65-1.75 mol/L; injecting the zinc sulfate solution into a reaction kettle, and heating the solution to 65 DEG C under 0.4 MPa steam heating; introducing hydrogen sulfide gas into the reaction kettle, and stirring to enable zinc sulfate to react with hydrogen sulfide; introducing the reacted material into a front water rinsing tank, discharging a supernatant into a sulfuric acid storage tank through sedimentation, then adding water, and washing with water; heating the water-washed powder slurry at the temperature of 90-93 DEG C, carrying out heat preservation for about 150 min, and curing; introducing the cured slurry into the water rinsing tank, and washing off impurities in crystals; filtering out mechanical impurities, then guiding the powder slurry into a dehydrator, and carrying out dehydration treatment;and drying the dehydrated powder. The device is simple in process, can be directly led out from an original waste gas channel, does not need to modify original facilities, is low in cost and high inpurification efficiency, and reduces atmospheric pollution.

Description

technical field [0001] The invention relates to the technical field of zinc sulfide production, in particular to a method for utilizing acid waste gas to produce zinc sulfide. Background technique [0002] Acid waste gas often contains hydrogen sulfide, hydrocarbons, etc. For example, in chemical production, when acid gas is produced, it will pollute the environment, especially in petrochemical production. The emission of waste gas is large, and the main components are gases containing CS2 and H2S. H2S accounts for about 70%-90%, and CS2 accounts for 20%. Most of the acid gases in my country are used for incineration or absorption, and the recovery rate reaches 95-99%. In this regard, many people with lofty ideals have done research, and there are many acid gas treatment methods. [0003] In summary, there are the following types: Combustion method, which mainly uses S in the CS2 and H2S molecules in the acid gas to produce elemental sulfur and SO2 after combustion; sulfur i...

Claims

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Application Information

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IPC IPC(8): C01G9/08B01D53/78B01D53/52
CPCC01G9/08B01D53/78B01D53/52
Inventor 李洪斗臧法收赵康徐明彬
Owner 弘润石化(潍坊)有限责任公司
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