阅读说明：本技术 一种脱硫废液提盐装置固体产品脱氯工艺 (Dechlorination process for solid product of desulfurization waste liquid salt extraction device ) 是由 张颂 姚良雨 刘伟 张涛 陈啸 于 2020-03-31 设计创作，主要内容包括：本发明公开了一种脱硫废液提盐装置固体产品脱氯工艺,属于化工技术领域,本发明的处理工艺包括如下步骤：1)溶解：将Cl<Sup>-</Sup>含量较高的脱硫废液提盐装置固体产品加入到溶解剂中溶解、过滤得到溶解液；2)浓缩：将溶解液进行浓缩得到浓缩液；3)干燥分离：将浓缩液经雾化干燥分离分别得到脱氯后的固体产品和干燥后的尾气；4)尾气处理：干燥后的尾气依次经过除尘和冷凝冷却得到冷凝液和不凝气体,不凝气体经过吸收液吸收后排入大气中。该方法可有效除脱硫废液提盐装置固体产品中的Cl<Sup>-</Sup>,提高脱硫废液提盐装置固体产品质量等级。(The invention discloses a solid product dechlorination process of a desulfurization waste liquid salt extraction device, belonging to the technical field of chemical industry, and the treatment process comprises the following steps: 1) dissolving: adding Cl ‑ Adding the solid product of the desulfurization waste liquid salt extraction device with higher content into a dissolving agent for dissolving and filtering to obtain a dissolved solution; 2) concentration: concentrating the dissolved solution to obtain a concentrated solution; 3) drying and separating: carrying out atomization, drying and separation on the concentrated solution to respectively obtain a dechlorinated solid product and a dried tail gas; 4) tail gas treatment: and (3) dedusting, condensing and cooling the dried tail gas in sequence to obtain condensate and non-condensable gas, and discharging the non-condensable gas into the atmosphere after the non-condensable gas is absorbed by the absorption liquid. The method can effectively remove the desulfurization waste liquid and extract saltCl in solid products ‑ And the quality grade of the solid product of the desulfurization waste liquid salt extraction device is improved.)

1. A solid product dechlorination process of a desulfurization waste liquid salt extraction device is characterized in that: removal of Cl^-Cl in solid product of high-content desulfurization waste liquid salt extraction device^-。

2. The process of claim 1, wherein the solid product dechlorination process comprises the following steps: the process is also suitable for removing other ions in the solid product of the desulfurization waste liquid salt extraction device, such as: fluorine ion, bromine ion, and the like, but are not limited to the above ions.

3. A solid product dechlorination process of a desulfurization waste liquid salt extraction device is characterized by comprising the following steps:

(1) dissolving and filtering: adding Cl^-Adding the solid product of the desulfurization waste liquid salt extraction device with higher content into a dissolving agent for dissolving and filtering to obtain a dissolved solution;

(2) and (3) evaporation and concentration: concentrating the dissolved solution to obtain a concentrated solution;

(3) drying and separating: carrying out atomization, drying and separation on the concentrated solution to obtain a dechlorinated solid product and a dried tail gas;

(4) tail gas treatment: and (3) dedusting, condensing and cooling the dried tail gas in sequence to obtain condensate and non-condensable gas, and discharging the non-condensable gas into the atmosphere after the non-condensable gas is absorbed by the absorption liquid.

4. The process of claim 3, wherein the solid product dechlorination process comprises the following steps: in the step (1), the solid product of the desulfurization waste liquid salt extraction device can be, but is not limited to: and the dissolving concentration of any one or more of ammonium thiocyanate, sodium thiocyanate, ammonium sulfate, sodium sulfate, ammonium thiosulfate and sodium thiosulfate is lower than the saturated concentration of the dissolved materials at the dissolving temperature in the dissolving agent.

5. The process of claim 3, wherein the solid product dechlorination process comprises the following steps: in the step (2), the concentration pressure is-0.095 MPa-0.1 MPa, the temperature is 60-110 ℃, and the concentration of the concentrated material is greater than the saturated concentration of the material at room temperature.

6. The process of claim 3, wherein the solid product dechlorination process comprises the following steps: in the step (4), the tail gas is processed by a dust remover to obtain solid particles as dechlorination products; the condensate is recycled as a dissolving agent.

7. The process of claim 3, wherein the solid product dechlorination process comprises the following steps: in the step (4), the condensate is recycled as a dissolving agent.

8. The process of claim 3, wherein the solid product dechlorination process comprises the following steps: in the step (4), the absorbent may be any one or more of pure water, dilute sulfuric acid solution, and dilute ammonia water, but is not limited to the above.

9. The process of claim 3, wherein the solid product dechlorination process comprises the following steps: the dissolving agent in the step (1) can be any one or more of methanol, ethanol and water, but is not limited to the above substances.

Technical Field

The invention relates to the technical field of chemical industry, in particular to a solid product dechlorination process of a desulfurization waste liquid salt extraction device.

Background

With the development of economy, the demand of people on good environment is increasing day by day, and the national environmental protection policy is becoming stricter. In order to meet the requirements of national policies, many coking enterprises construct desulfurization waste liquid salt extraction devices in many times, so as to extract solid salt products with high added values from desulfurization waste liquid, thereby performing resource treatment on the desulfurization waste liquid. Although various solid salts produced by the desulfurization waste liquid salt extraction device have wide application, the dosage is less. At present, the market demand of solid products of various desulfurization waste liquid salt extraction devices is basically in a saturated state. Due to the market of buyers and the high selectivity of the buyers, the quality requirement on solid products of the desulfurization waste liquid salt extraction device is more and more strict. Cl in solid product of desulfurization waste liquid salt extraction device^-And other toxic and harmful ions, can bring adverse effects to downstream products, and has strong corrosion to equipment and pipelines of downstream manufacturers. At present, Cl^-The content of the sodium chloride is a main index for judging the quality of solid products of a desulfurization waste liquid salt extraction device.

The construction of the desulfurization waste liquid salt extraction device is generally earlier, and no specific dechlorination process exists, so that partial device products are Cl^-The content is higher, so that the product grade is judged to be lower, and the economic benefit of the desulfurization waste liquid salt extraction device is directly influenced.

Thus, Cl is removed^-Cl in solid product of high-content desulfurization waste liquid salt extraction device^-The quality grade of the product can be improved, and the profitability of the desulfurization waste liquid salt extraction device is enhanced. And simultaneously, the protection of equipment and pipelines of downstream manufacturers is facilitated.

Disclosure of Invention

The invention aims to solve the technical problem of providing a solid product dechlorination process of a desulfurization waste liquid salt extraction device. The invention utilizes Cl^-Method for preparing Cl from solid product of high-content desulfurization waste liquid salt extraction device^-The solid product of the desulfurization waste liquid salt extraction device with lower content can improve the product grade.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: dechlorination process for solid product of desulfurization waste liquid salt extraction device, namely removing Cl^-In a relatively high contentCl in solid product of desulfurization waste liquid salt extraction device^-。

Preferably, the process is also suitable for removing other ions in the solid product of the desulfurization waste liquid salt extraction device, such as: fluorine ion, bromine ion, and the like, but are not limited to the above ions.

The solid product dechlorination process of the desulfurization waste liquid salt extraction device comprises the following steps:

(1) dissolving and filtering: adding Cl^-Adding the solid product of the desulfurization waste liquid salt extraction device with higher content into a dissolving agent for dissolving and filtering to obtain a dissolved solution;

(2) and (3) evaporation and concentration: concentrating the dissolved solution to obtain a concentrated solution;

(3) drying and separating: carrying out atomization, drying and separation on the concentrated solution to obtain a dechlorinated solid product and a dried tail gas;

(4) tail gas treatment: and (3) dedusting, condensing and cooling the dried tail gas in sequence to obtain condensate and non-condensable gas, and discharging the non-condensable gas into the atmosphere after the non-condensable gas is absorbed by the absorption liquid.

Preferably, in the step (1), the solid product of the desulfurization waste liquid salt extraction device can be, but is not limited to: and the dissolving concentration of any one or more of ammonium thiocyanate, sodium thiocyanate, ammonium sulfate, sodium sulfate, ammonium thiosulfate and sodium thiosulfate is lower than the saturated concentration of the dissolved materials at the dissolving temperature in the dissolving agent.

Preferably, in the step (2), the concentration pressure is-0.095 MPa-0.1 MPa, the temperature is 60 ℃ to 110 ℃, and the concentration of the concentrated material is greater than the saturation concentration of the material at room temperature.

Preferably, in the step (4), the tail gas is processed by a dust remover to obtain solid particles as dechlorination products; the condensate is recycled as a dissolving agent.

Preferably, in the step (4), the condensate is recycled as the dissolving agent.

Preferably, in the step (4), the absorbent may be any one or more of pure water, dilute sulfuric acid solution, and dilute ammonia water, but is not limited thereto.

Preferably, the dissolving agent in the step (1) can be any one or more of methanol, ethanol and water, but is not limited to the above substances.

By adopting the technical scheme of the invention, the following beneficial effects can be obtained:

the invention relates to a solid product dechlorination process of a desulfurization waste liquid salt extraction device, which utilizes Cl^-Method for preparing Cl from solid product of high-content desulfurization waste liquid salt extraction device^-The solid product of the desulfurization waste liquid salt extraction device with lower content improves the product quality grade, and enhances the profitability of the desulfurization waste liquid salt extraction device.

Drawings

The contents of the description and the references in the drawings are briefly described as follows:

FIG. 1 is a flow chart of the dechlorination process.

Detailed Description

The invention is further described below with reference to specific examples.

For removing Cl^-Cl in solid product of high-content desulfurization waste liquid salt extraction device^-The invention provides a dechlorination process for a solid product of a desulfurization waste liquid salt extraction device, which can simply and reliably remove Cl in the solid product of the desulfurization waste liquid salt extraction device^-. The present invention will be described in detail below with reference to specific examples.