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Solid waste comprehensive utilization method for sodium sulfide production and apparatus thereof

A technology of sodium sulfide and production line, which is applied in the field of comprehensive utilization of solid waste in sodium sulfide production, can solve the problems of low cost of solid waste, large environmental protection pressure and treatment of enterprises, and achieve the goal of reducing the cost of treatment of three wastes, running well, and improving economic benefits. Effect

Active Publication Date: 2018-06-19
HUBEI ZHENHUA CHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method and device for comprehensive utilization of solid waste in sodium sulfide production in view of the problem that the solid waste generated in the production process of the sodium sulfide industry cannot be treated at low cost and brings great environmental protection pressure to the enterprise

Method used

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  • Solid waste comprehensive utilization method for sodium sulfide production and apparatus thereof
  • Solid waste comprehensive utilization method for sodium sulfide production and apparatus thereof
  • Solid waste comprehensive utilization method for sodium sulfide production and apparatus thereof

Examples

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Embodiment 1

[0034] This embodiment takes the actual production situation of Huangshi Xintai Alkali Industry Co., Ltd. on September 16, 2017 as an example to explain the method of the present invention, and does not limit the present invention in any form:

[0035] see figure 1 , figure 2 , a method for the comprehensive utilization of sodium sulfide production solid waste, comprising the steps of:

[0036] (1) Add the alkali mud containing sodium sulfate, sodium sulfide, sodium carbonate, ferrous sulfide and PH>13 produced on the sodium sulfide production line into the slurry mixing tank 1 with a stirring device, add water for slurry mixing, and make the slurry contain The water yield reaches 80%; Na in the alkali mud 2 The mass percentage of S is 3%, the mass percentage of FeS is 10%, and the Na 2 CO 3 The mass percentage content is 10%, Na 2 SO 4 The mass percentage content of 20%;

[0037] (2) Send the above-mentioned slurry to the desulfurization circulation pool 3 with the st...

Embodiment 2

[0078] A method for the comprehensive utilization of sodium sulfide production solid waste, comprising the steps of:

[0079] (1) Add the alkali mud containing sodium sulfate, sodium sulfide, sodium carbonate, ferrous sulfide and pH>13 produced on the sodium sulfide production line into the slurry mixing tank with stirring device, and add water for slurry mixing to make the slurry water content Reach 70%; Na in the alkali mud 2 The mass percentage of S is 0.5%, the mass percentage of FeS is 5%, and the Na 2 CO 3 The mass percentage content is 15%, Na2 SO 4 The mass percentage content of 15%;

[0080] (2) Pump the above-mentioned slurry to the desulfurization circulation pool with stirring device, and pump the slurry in the desulfurization circulation pool from the bottom of the pool to the spray pipe at the top of the flue gas desulfurization tower to spray downwards, After countercurrent contact with sulfur-containing flue gas, it flows back from the bottom of the flue ga...

Embodiment 3

[0086] A method for the comprehensive utilization of sodium sulfide production solid waste, comprising the steps of:

[0087] (1) Add the alkali mud containing sodium sulfate, sodium sulfide, sodium carbonate, ferrous sulfide and pH>13 produced on the sodium sulfide production line into the slurry mixing tank with stirring device, and add water for slurry mixing to make the slurry water content Reach 85%; Na in the alkali mud 2 The mass percentage of S is 5%, the mass percentage of FeS is 15%, and the Na 2 CO 3 The mass percentage content is 5%, Na 2 SO 4 The mass percentage content of 25%;

[0088] (2) Pump the above-mentioned slurry to the desulfurization circulation pool with stirring device, and pump the slurry in the desulfurization circulation pool from the bottom of the pool to the spray pipe at the top of the flue gas desulfurization tower to spray downwards, After countercurrent contact with sulfur-containing flue gas, it flows back from the bottom of the flue ga...

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Abstract

The invention discloses a solid waste comprehensive utilization method for sodium sulfide production and an apparatus thereof. The method is characterized in that sodium sulfide production caustic mudis added in a slurry mixing tank, water is added for mixing a slurry to a water content to 70-85%; the slurry is sent to a desulphurization cycle pool, stirring is carried out for pumping the slurryto a flue gas desulfurization tower, then the slurry is contacted with sulfur-containing flue gas for desulphurization, and when a pH value of the slurry in the desulphurization cycle pool achieves 7-9, the slurry is sent to a buffer pool; the slurry in the buffer pool is heated to the temperature of more than 80 DEG C, and is sent to a frame and plate filtration machine for being filtered, and afiltrate is sent to a sodium hyposulfite crude liquid storage tank; a filter cake is taken as general industrial solid waste for treatment; the content of sodium hyposulfite in the detection crude liquid storage tank is greater than or equal to 650 g / l, the sodium hyposulfite is sent to a settling tank for being heated and clarified for 3-5 hours, a supernatant is sent to a sodium thiosulfate pentahydrate production apparatus for crystallization and dehydration, and mother liquor is returned for slurry mixing tank for usage. The method uses the sodium sulfide production caustic mud for processing sulfur-containing tail gas, waste can be used for controlling waste, a sodium hyposulfite product is recovered, enterprise environmental protection pressure is greatly reduced, and enterprise economic benefit is increased.

Description

technical field [0001] The invention relates to the technical field of solid waste and flue gas environmental protection treatment, in particular to a method and device for comprehensive utilization of solid waste produced by sodium sulfide. Background technique [0002] Industrial sodium sulfide (soda sulfide) production enterprises are mainly located in the west, and the common solid waste disposal method is open-air storage without comprehensive utilization. According to the "National Hazardous Waste List" implemented on August 1, 2016, the solid waste of alkali sulfide is included in the category of corrosive hazardous waste due to its strong alkalinity (HW35-900-399-35, other alkali residue ). Soda sulfide solid waste comes from the alkali mud produced in the sodium sulfide concentrated brine clarification process. The filter cake after washing and filtering contains 0.5-5% sodium sulfide, 5-15% sodium carbonate, 15-25% sodium sulfate, 5- 15% ferrous sulfide, its pH&g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00B01D53/80B01D53/96B01D53/50
CPCB01D53/502B01D53/96C02F11/00
Inventor 袁金海
Owner HUBEI ZHENHUA CHEMICAL CO LTD