A process for recovering all components of desulfurization waste liquid

A technology of desulfurization waste liquid and all components, which is applied in the direction of ammonium sulfate, etc., can solve the problems of difficult desulfurization waste liquid treatment, unsalable auxiliary salts, etc., and achieve the effect of resource utilization, content reduction, and simplified process flow

Active Publication Date: 2022-02-18
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0007] The purpose of the present invention is to provide a process for recovering all components of desulfurization waste liquid, realize the recovery and utilization of all components of desulfurization waste liquid, solve the problems of difficult desulfurization waste liquid treatment, unsalable secondary salts, etc., and realize the comprehensive utilization of desulfurization waste liquid

Method used

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  • A process for recovering all components of desulfurization waste liquid

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Effect test

Embodiment 1

[0026] The desulfurization waste liquid used in this example is the filtrate produced after the ammonia method of coking plants removed from the sulfur paste. Take 500 mL to remove the filtrate after the thio paste, the main component of the filtrate 155 g · L -1 , Ammonium thiosulfate 85 g · L -1 , Ammonium sulfate 45 g · L -1 .

[0027] In the first step, the filtrate passed into the pre-processor for preheating, evaporated. The preheating temperature was 90 ° C, and the evaporation concentration process produced 250 ml of condensate into the desulfurization process, producing a 250 mL concentrate for subsequent conversion treatment, preheating and evaporation heating heat sources are provided by thermally conductive oil.

[0028] In the second step, the concentrated concentrate after pretreatment is transferred into a fixed bed oxidation reactor to catalytic conversion treatment. During the conversion reaction, 200 ml of mass percentage of concentrated sulfuric acid was added, ...

Embodiment 2

[0034] The desulfurization waste liquid used in this example is a meltway sulfur solution produced by the ammonia method of the coking plant. Take 500 ml of the sulfur sulfur, the main component of the sulfur sulfur is 140 g · L -1 , Ammonium thiosulfate 90 g · L -1 , Ammonium sulfate 40 g · L -1 .

[0035]In the first step, the sulfur sulfur liquid is transferred into the pre-processor for evaporation concentration, producing 250 ml of condensate into the desulfurization section, producing a 250 mL concentrate for subsequent conversion treatment, and evaporating heating heat sources are provided by thermal oil.

[0036] In the second step, the concentrated concentrate after pretreatment is transferred into a fixed bed oxidation reactor to catalytic conversion treatment. During the conversion reaction, 25 ml of mass percentage of concentrated sulfuric acid was added, and the volume ratio of the solution and the desulfurization waste liquid gas solution was 100: 1, the reaction tem...

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Abstract

The invention discloses a process for recovering all components of desulfurization waste liquid. The process is to pretreat the desulfurization waste liquid. The pretreatment process includes preheating or evaporation concentration; then the pretreatment liquid is passed into an oxidation conversion reactor, Carry out catalytic conversion treatment, add concentrated sulfuric acid with a mass percentage of 92%-98% during the conversion process, the conversion temperature is 110-130°C, and the conversion pressure is 0.1-0.5 MPa; the converted acid gas is washed with desulfurization liquid, and the converted The desulfurization solution is decolorized to obtain a sulfuric acid solution containing ammonium bisulfate. The invention converts all auxiliary salts in desulfurization waste liquid, has simple process flow, low investment and operation costs, solves the problems of difficult desulfurization waste liquid treatment and slow sales of desulfurization waste liquid auxiliary salts, and realizes full component recovery of desulfurization waste liquid and use.

Description

Technical field [0001] The present invention relates to a process of complete component recovery of desulfurization waste liquid, belonging to the field of desulfurization waste liquid treatment. Background technique [0002] Wet oxidation removal technology is a widely used technology in the current coke industry, which will be produced during the desulfurization process (NH 4 ) 2 S 2 O 3 NH 4 Since the SCN, which reduces desulfurization efficiency when the sub-salt content is too high, affecting the reaction activity of the catalyst. Therefore, a large amount of desulfurization waste liquid containing high concentration of sub-salts is therefore emissions while introducing freshly desulfurization solution. The highly toxic desulfurization waste liquid enters the biochemical treatment section can lead to microbial death, biochemical system paralyzed; desulfurization waste liquid searches will seriously pollute groundwater, resulting in waste of resources. Therefore, it is effect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/24
CPCC01C1/24
Inventor 李国强柴思琪张永发张国杰
Owner TAIYUAN UNIV OF TECH
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