阅读说明：本技术 一种利用酸性废气生产硫化锌的方法 (Method for producing zinc sulfide by using acidic waste gas ) 是由 李洪斗 臧法收 赵康 徐明彬 于 2019-07-09 设计创作，主要内容包括：本发明提供了一种利用酸性废气生产硫化锌的方法,包括：配制摩尔浓度为1.65～1.75mol/L的硫酸锌溶液；将硫酸锌溶液注入反应釜,并在0.4Mpa蒸汽加热下,将溶液加热到65℃；向反应釜中通入硫化氢气体,搅拌使硫酸锌与硫化氢反应；将反应后物料导入前水洗槽,经过沉降将上清液排入硫酸储槽内,然后加入水进行水洗；将水洗后的粉浆在90-93℃内加热保温约150min,进行熟化；熟化完成的粉浆导入后水洗槽,洗掉晶体中的杂质；过滤掉机械杂质,然后将粉浆导入脱水机进行脱水处理；将脱水后的粉料干燥处理。本发明工艺简单,可直接从原废气通道中引出,不必对原设施进行改造,成本低,净化效率高,减少对大气污染。(The invention provides a method for producing zinc sulfide by using acidic waste gas, which comprises the following 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 ℃ under the heating of 0.4Mpa steam; introducing hydrogen sulfide gas into the reaction kettle, and stirring to enable the zinc sulfate to react with the hydrogen sulfide; introducing the reacted materials into a front water washing tank, discharging the supernatant into a sulfuric acid storage tank through sedimentation, and then adding water for washing; heating the washed powder slurry at 90-93 deg.C for 150min, and aging; introducing the cured slurry into a water washing tank to wash off impurities in the crystals; filtering out mechanical impurities, and then introducing the powder slurry into a dehydrator for dehydration; and drying the dehydrated powder. The invention has simple process, can be directly led out from the original waste gas channel, does not need to modify the original facilities, has low cost and high purification efficiency, and reduces the air pollution.)

1. a method for producing zinc sulfide by using acidic waste gas is characterized by comprising the following 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 ℃ under the heating of 0.4Mpa steam;

introducing hydrogen sulfide gas into the reaction kettle, and stirring to react the zinc sulfate with the hydrogen sulfide;

introducing the reacted materials into a front washing tank, discharging supernatant (dilute sulfuric acid) into a sulfuric acid storage tank through sedimentation, and then adding water for washing;

heating the washed powder slurry at 90-93 deg.C for 150min, and aging;

Introducing the cured slurry into a water washing tank to wash off impurities in the crystals;

Filtering out mechanical impurities, and then introducing the powder slurry into a dehydrator for dehydration;

And drying the dehydrated powder.

2. The method for producing zinc sulfide by using acid exhaust gas as claimed in claim 1, wherein the concentration of zinc sulfate is 1.70 mol/L.

3. The method for producing zinc sulfide by using acid exhaust gas as claimed in claim 1, wherein the method further comprises the following steps before the zinc sulfate solution enters the reaction kettle:

Filtering impurities with the grain diameter less than 15 mu m in the zinc sulfate solution.

4. the method for producing zinc sulfide by using acid exhaust gas as claimed in claim 1, wherein the zinc sulfate solution is prepared by reacting 0# zinc oxide with refined sulfuric acid.

5. The method for producing zinc sulfide by using acid exhaust gas as claimed in claim 1, wherein the temperature of the slurry powder after washing with water is 91.5 ℃.

6. The method for producing zinc sulfide by using acid exhaust gas according to claim 1, wherein the hydrogen sulfide gas is derived from industrial exhaust gas.

Technical Field

the invention relates to the technical field of zinc sulfide production, in particular to a method for producing zinc sulfide by using acidic waste gas.

background

the acid waste gas usually contains hydrogen sulfide, hydrocarbons and the like, for example, in chemical production, the environment is polluted when acid gas is generated, especially, the emission of waste gas in petrochemical production is large, the main components are gases containing CS2 and H2S, wherein H2S accounts for about 70-90%, CS2 accounts for 20%, most of acid gas in China is used for incineration or absorption, the recovery rate reaches 95-99%, and the rest toxic gases such as CS2, H2S and the like are emitted at high altitude or inorganically. Many people have studied this problem and many methods for treating acid gases have been developed.

The following are summarized: the combustion method mainly utilizes that CS2 and H2S molecules in acid gas both contain S, and elemental sulfur and SO2 are produced after combustion; the sulfur is taken as a product independently, SO2 can be combusted to generate SO3 or be reacted by NaOH to generate Na2SO3 and the like to be discharged. The combustion method needs certain concentration and stability of waste gas, otherwise, the combustion is unstable, which is difficult to achieve in China. Meanwhile, the corrosion of instrument equipment and the like is high, the recycled product value is low, and the low-concentration waste gas cannot be combusted and recycled. The alkali absorption method has a long history, a tall absorption tower or a leaching tower is often adopted, the occupied area is large, waste water is generated, the method has large capital construction investment and large alkali consumption, and H2S cannot be thoroughly removed. The complex iron method is to oxidize the sulfurated hydrogen in the acid gas by the complex iron to generate elemental sulfur, thus achieving the purpose of purification. And then regenerated by a complexing agent for recycling. But the process has unstable desulfurization effect, and when the fluctuation of acid gas is large, tower flushing is easily caused, and the complexing agent is brought to the later stage of working procedure. The method is more tightly controlled, the operation cost is invested every year, the operation cost is higher, and the tail gas index is not stable. The catalytic method, adopting catalyst to remove H2S, is basically based on Claus reaction, some adopt organic solvent, carry on the liquid phase reaction to reclaim sulphur, this method is operated complicatedly, the expense is high, or carry on under the gaseous phase condition, but the catalyst activity will reduce, therefore the regeneration of catalyst, catalyst life directly influence and treat the recovery cost. The ammonia method uses ammonia water to react with hydrogen sulfide in acid gas to generate ammonium sulfate, so that secondary pollution is avoided, ammonia escape is easily caused, and the atmospheric environment is polluted. At present, no report of a method for treating hydrogen sulfide in comprehensive utilization waste gas with low investment, low operation cost and high added value is found.

In view of the above, the prior art is obviously inconvenient and disadvantageous in practical use, and needs to be improved.

Disclosure of Invention

In view of the above-mentioned drawbacks, the present invention aims to provide a method for producing zinc sulfide by using acidic waste gas, which has low investment and low operation cost.

In order to achieve the above object, the present invention provides a method for producing zinc sulfide by using acidic exhaust gas, which is characterized by comprising the following 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 ℃ under the heating of 0.4Mpa steam;

Introducing hydrogen sulfide gas into the reaction kettle, and stirring to react the zinc sulfate with the hydrogen sulfide;

Introducing the reacted materials into a front washing tank, discharging supernatant (dilute sulfuric acid) into a sulfuric acid storage tank through sedimentation, and then adding water for washing;

heating the washed powder slurry at 90-93 deg.C for 150min, and aging;

Introducing the cured slurry into a water washing tank to wash off impurities in the crystals;

Filtering out mechanical impurities, and then introducing the powder slurry into a dehydrator for dehydration;

And drying the dehydrated powder.

According to the method for producing the zinc sulfide by using the acid waste gas, the concentration of the zinc sulfate is 1.70 mol/L.

According to the method for producing zinc sulfide by using acid waste gas, before zinc sulfate solution enters the reaction kettle, the method further comprises the following steps:

Filtering impurities with the grain diameter less than 15 mu m in the zinc sulfate solution.

According to the method for producing zinc sulfide by using acid waste gas, the zinc sulfate solution is prepared by reacting 0# zinc oxide with refined sulfuric acid.

According to the method for producing zinc sulfide by using acidic waste gas, the temperature of the slurry powder after washing is 91.5 ℃.

according to the method for producing zinc sulfide by using the acid waste gas, the hydrogen sulfide gas is derived from industrial waste gas.

The invention provides a method for producing zinc sulfide by using acidic waste gas, which comprises the following 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 ℃ under the condition of 0.4Mpa steam heating; introducing hydrogen sulfide gas into the reaction kettle, and stirring to enable the zinc sulfate to react with the hydrogen sulfide; introducing the reacted materials into a front water washing tank, discharging the supernatant into a sulfuric acid storage tank through sedimentation, and then adding water for washing; heating the washed powder slurry at 90-93 deg.C for 150min, and aging; introducing the cured slurry into a water washing tank to wash off impurities in the crystals; filtering out mechanical impurities, and then introducing the powder slurry into a dehydrator for dehydration; and drying the dehydrated powder. The invention has simple process, can be directly led out from the original waste gas channel, does not need to modify the original facilities, has low cost and high purification efficiency, and reduces the air pollution.

Detailed Description

in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

the invention provides a method for producing zinc sulfide by utilizing acid waste gas, which takes hydrogen sulfide in the waste gas as a raw material to react with zinc sulfate to generate a zinc sulfide product with high added value, the method has simple process and easy implementation, the method mainly uses the zinc sulfate to absorb H ₂ S, the by-product sulfuric acid reacts with zinc oxide to generate the zinc sulfate to form recycling, and the reaction formula is as follows:

ZnSO ₄ + H ₂ S → ZnS + H ₂ SO ₄ or ZnO + H ₂ SO ₄ → ZnSO ₄ + H ₂ O.

the comprehensive utilization process method of the waste gas hydrogen sulfide needs to be provided with the following hardware equipment: a high-speed reaction kettle formed by high-speed stirring is provided with a high-speed stirrer, zinc sulfate and hydrogen sulfide are fully reacted under high-speed stirring after entering the reaction kettle, one end of a shell is an input port for reaction, the other end of the shell is an outlet for zinc sulfide, the top of the shell is provided with a tail gas discharge line, and a feeding nozzle is connected with a water supply pipe connected with a water supply system; after entering the reaction kettle, the material forms a vortex shape, the reaction is sufficient, and the crystal forming quality is improved.

Specifically, the method of the invention comprises the following steps:

1) Dissolving and preparing a zinc sulfate solution: the molar concentration of the prepared zinc sulfate solution is 1.65-1.75 mol/L. In one embodiment, a concentration of about 1.70mol/L is preferably used.

2) heating and filtering: filtering and purifying the solution by a liquid delivery pump of a liquid supply system through a filter, filtering impurities with the particle size of less than 15 mu m in the liquid drops, and feeding the zinc sulfate solution into a reaction kettle; the solution was heated to 65 ℃ under 0.4MPa steam heating to the reaction temperature.

3) Reaction: the zinc sulfate solution enters a reaction kettle, is heated and then is introduced with hydrogen sulfide gas, and the zinc sulfate and the hydrogen sulfide react fully under the stirring condition.

4) Washing with water; introducing the reacted materials into a front water washing tank, discharging the supernatant (dilute sulfuric acid) into a sulfuric acid storage tank through sedimentation, and then adding water for water washing.

5) Curing: and curing the washed powder slurry, heating and preserving the heat for about 150min at 90-93 ℃, and improving the crystallinity of the zinc sulfide, so that the zinc sulfide shows special particle size distribution and dispersibility.

6) And (3) post-washing: and introducing the aged powder slurry into a water washing tank to wash out impurities such as sulfate and the like in the crystal.

7) And (3) filtering and dehydrating: mechanical impurities and the like are filtered out by a water sieving machine, and then the powder slurry is guided into a dehydrator for dehydration.

8) and (3) drying: and (4) drying the dehydrated powder in a drying box, and packaging after reaching the standard.

the invention has the beneficial effects that:

1. The method removes the hydrogen sulfide by the reaction of the zinc sulfate and the hydrogen sulfide, has simple process, can be directly led out from an original waste gas channel, does not need to modify original facilities, has convenient installation, low cost and high purification efficiency, and reduces the air pollution.

2. Compared with the traditional wet spraying technology, the process has the advantages of low energy consumption and less steam consumption, is one tenth of that of other processes (amine method and incineration), greatly saves energy sources, and greatly reduces the humidity of waste gas.

3. the method can be used for desulfurization by using different absorption liquids, and can also be used for the products such as power plants, paper mills, pharmaceutical factories, chemical plants, fertilizer plants and the like, the added value of zinc sulfide is high, the method is superior to the conventional process, the production cost can be reduced, and the production economic benefit of petrochemical industry can be improved.

4. The sulfuric acid by-product is used as raw material, and can be cyclically utilized, so that the potential safety hazard in production can be reduced, and the environmental pollution can be avoided.

the present invention provides a number of embodiments as follows: