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Method for treating sodium sulfide waste water

A technology for soda sulfide and waste water, which is applied in the direction of oxidized water/sewage treatment, thiosulfate/dithionite/polythionite, etc., and can solve the problems of ineffective treatment, high cost, time-consuming and laborious, etc. , to achieve the effects of reducing production and operating costs, improving safety, and reducing costs

Active Publication Date: 2013-03-27
SHANDONG HUIHAI PHARMA & CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the hydrogen sulfide tail gas produced in chemical production is usually absorbed by liquid alkali, which will inevitably lead to the production of a large amount of alkali sulfide wastewater with high concentration. This wastewater mainly contains sodium sulfide, and the concentration of sodium sulfide in some wastewater is close to saturation. None of the treatment schemes shown in the table can be effectively treated, and the cost is huge, time-consuming and labor-intensive

Method used

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  • Method for treating sodium sulfide waste water
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  • Method for treating sodium sulfide waste water

Examples

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Effect test

Embodiment 1

[0021] Add 3500kg (39%) of high-concentration alkali sulfide wastewater into the 5000L reactor, 589kg (95%) of industrial waste sulfur, and 1.7kg of ferrous ammonium sulfate, start stirring, raise the temperature to 50°C, start to introduce air, and control the reaction temperature at 50 o C, the reaction pressure is 0.3MPa, and the reaction is completed after 12 hours. After the reaction is completed, it is heated and filtered. After the filtered solid catalyst is collected, it is put back into the reactor for recycling. Concentrate under vacuum at -0.09MPa until the volume is reduced by 1 / 3, and then crystallize after cooling, the temperature of cooling crystallization is 16-24 degrees; finally, after filtering and drying, 2100kg of sodium thiosulfate pentahydrate is obtained, with a content of 98.89%.

[0022] Filter the obtained catalyst residue and the mother liquor to be reused in the following 10 reaction cycles without any treatment, the average available product is 21...

Embodiment 2

[0025] Add 3600 (36%) kg of high-concentration alkali sulfide wastewater, 560 kg (95%) of industrial waste sulfur, and 1.8 kg of composite catalyst (aluminum oxide: manganese sulfate = 1:2) into the 5000L reactor, start stirring, and heat up to 70°C, start to feed air, and control the reaction temperature at 70°C o C. The reaction pressure is 0.1MPa, and the reaction is completed after 6 hours. After the reaction is completed, it is heated and filtered. After the filtered solid catalyst is collected, it is put back into the reactor for recycling. Concentrate under vacuum at -0.09MPa until the volume is reduced by 1 / 3, and then crystallize on cooling, the temperature of cooling crystallization is 10-15 degrees; after filtering and drying, 2122kg of sodium thiosulfate pentahydrate is obtained, with a content of 98.86%.

Embodiment 3

[0027] Add 3500kg (35%) of high-concentration sodium sulfide wastewater into the 5000L reactor, 529kg (95%) of industrial waste sulfur, and 1.6kg of fly ash. o C, the reaction pressure is 0.4MPa, the reaction is completed after 10 hours, after the reaction is completed, it is heated and filtered, and the filtered solid catalyst is collected and then put into the reactor for recycling. Concentrate under vacuum conditions at -0.09MPa until the volume is reduced by 1 / 3, and then crystallize after cooling. The temperature of cooling crystallization is 30-40 degrees. Finally, after filtering and drying, 2087kg of sodium thiosulfate pentahydrate is obtained, with a content of 98.65%.

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Abstract

The invention relates to a method for treating sodium sulfide waste water, which comprises the following steps: mixing the sodium sulfide waste water, industrial waste sulphur and a catalyst; then introducing air for oxidation reaction; after the oxidation reaction is completed, filtering, and carrying out concentration, temperature reduction and crystallization on the filter liquor, and filtering again to obtain a sodium thiosulfate crystal and crystallizing mother liquor; and drying the sodium thiosulfate crystal to obtain sodium thiosulfate pentahydrate. The method disclosed by the invention reduces the production and operation cost by carrying out the oxidation reaction at lower temperature and pressure, thereby greatly enhancing the safety of the reaction process; the method greatly reduces the cost by using the air as an oxidation source, obtains a single product with the content of more than 98.5% after reaction, has the advantages of certain economic benefit, perpetual recycling of circulating mother liquor, zero discharge of waste liquor and is a green process.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for treating alkali sulfide wastewater. Background technique [0002] Sodium sulfide is a very useful chemical, widely used in tanning, pharmaceutical, petrochemical and other industries. However, due to its serious pollution to the environment, its further use has been affected. At present, the large-scale treatment methods at home and abroad mainly include 1) acidification recovery method, 2) precipitation method, 3) oxidation method, 4) adsorption method and 5) biochemical treatment method, etc. Although these methods can be dealt with, their shortcomings are also very obvious. See the table below: [0003] [0004] At present, the hydrogen sulfide tail gas produced in chemical production is usually absorbed by liquid alkali, which will inevitably lead to the production of a large amount of high-concentration alkali sulfide wastewater. This wast...

Claims

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Application Information

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IPC IPC(8): C02F1/74C01B17/64
Inventor 牟应科张忠政高绪利李新忠卢言建张国辉
Owner SHANDONG HUIHAI PHARMA & CHEM
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