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Process and device for recovering sodium sulphide wastewater in barium sulphate production

A waste water recovery and sodium sulfide technology, which is applied in the preparation of sulfate/bisulfate, sulfur compounds, inorganic chemistry, etc., can solve the problems of environmental pollution, evaporation and crystallization energy consumption, etc., and achieve the effect of protecting the environment

Inactive Publication Date: 2013-04-24
BEIJING UNIV OF CHEM TECH
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  • Abstract
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Problems solved by technology

[0003] The concentration of dilute sodium sulfide waste liquid produced during the washing process of sodium sulfate products is 1%-2.5%. Evaporation and crystallization consume too much energy and are directly discharged to pollute the environment.

Method used

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  • Process and device for recovering sodium sulphide wastewater in barium sulphate production
  • Process and device for recovering sodium sulphide wastewater in barium sulphate production
  • Process and device for recovering sodium sulphide wastewater in barium sulphate production

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Embodiment Construction

[0025] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0026] The process method and equipment system used, please refer to Figure 1 and figure 2 , the sodium sulfide recovery process of the embodiment of the present invention is used to recover the dilute sodium sulfide waste liquid with a concentration of 1%-2.5%, and the process comprises the following steps:

[0027] (1) Take the sodium sulfide waste liquid with a mass concentration of 1%-2.5%, add sulfuric acid for neutralization, generate sodium sulfate solution, hydrogen sulfide, and by-product sulfur, and filter;

[0028] (2) collecting the filtered sulphur after the filtration of st...

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Abstract

The invention discloses a process and a device for recovering sodium sulphide wastewater in barium sulphate production, belonging to the technical field of wastewater recovery. The process comprises the following steps performed by the corresponding devices: adding sulphuric acid to neutralize dilute sodium sulphide waste solution; absorbing hydrogen sulphide by a sodium sulphide spray tower; adding hydrogen peroxide in the sodium sulphate solution, so as to oxidize hydrogen sulphide which is dissolved in sodium sulphate solution into sulphur; filtering the sodium sulphate solution; and finally charging the sodium sulphate dilute solution in a disc-tube type reverse osmosis membrane system or a high-pressure flat-sheet membrane system, then concentrating, reusing the concentrate in barium sulphate production, and directly draining clear solution, so as to achieve the effect of turning waste into wealth.

Description

technical field [0001] This product belongs to the field of wastewater recycling, and specifically relates to a process and device for the treatment of sodium sulfide and a process and system for the concentration and recovery of sodium sulfate. technical background [0002] Barium sulfate is an important basic chemical raw material, which is widely used in coatings, inks, rubber, plastics, textiles and other industries. During the production of barium sulfate: BaS+Na 2 SO 4 =BaSO 4 +Na 2 S, the product Na in this reaction 2 The concentration of S is 4%-6%, and the factory is used for evaporation and crystallization to produce alkali sulfide products. In addition, the dilute sodium sulfide waste liquid produced in the cleaning process of barium sulfate product has a concentration of 1%-2.5%. If the method of evaporative crystallization is used, the energy consumption is too large, which is not economical and practical. At present, there is no suitable treatment method,...

Claims

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Application Information

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IPC IPC(8): C01D5/02C01B17/05C01B17/32
Inventor 周俊波叶薇董鹏宇潘胜
Owner BEIJING UNIV OF CHEM TECH
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