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Device and method for desulfuration and decyanation treatment of waste liquid generated in vacuum potassium carbonate desulfurization process

A technology of vacuum potassium carbonate and desulfurization process, which is applied in the direction of gaseous effluent wastewater treatment, dehydration/drying/concentrated sludge treatment, sludge treatment, etc. Good utilization method, difficult operation and control, etc., to achieve the effect of low cost of chemicals and operation, strong engineering application value, and reduction of sulfur cyanide content

Inactive Publication Date: 2016-07-20
武汉钢铁有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The outstanding problems in the pretreatment of the prior art are as follows: 1. The treatment process is complex, the dosage is large, the treatment cost is high, and the operation control is difficult; 2. The chemical sludge produced after treatment is not well utilized 3. The removal of sulfide and cyanide in the waste liquid is not complete, or the problem of low efficiency

Method used

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  • Device and method for desulfuration and decyanation treatment of waste liquid generated in vacuum potassium carbonate desulfurization process
  • Device and method for desulfuration and decyanation treatment of waste liquid generated in vacuum potassium carbonate desulfurization process

Examples

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Effect test

Embodiment 1

[0043] Embodiment 1: as figure 1 A treatment device for desulfurization and decyanation of waste liquid in the vacuum potassium carbonate desulfurization process shown, its equipment setting and implementation steps are all the same as above, wherein: the waste liquid is 1L,

[0044] (1) Pretreatment: The dosage of ferrous sulfate in reaction tank 1 is 180g / L, the dosage of coagulant is 0.2g / L, the reaction temperature is 15°C, and the reaction gas-water ratio is 3:1. The hydraulic retention time is 2 hours. After aeration and stirring, a large amount of black mixture is pumped to the sedimentation tank 9 for mud-water separation. The rotation speed of the mixer 10 in the sedimentation tank 9 is 50rpm, the hydraulic retention time in the sedimentation tank 9 is 10h, the sludge at the bottom of the sedimentation tank 9 is pumped to the sludge filter press system, and the mud cake is sent to the coal yard for coal blending and coking. After the reaction, the supernatant in the ...

Embodiment 2

[0046] Embodiment 2: as figure 1 A treatment device for desulfurization and decyanation of waste liquid of a vacuum potassium carbonate desulfurization process shown, its equipment and implementation steps are the same as in Example 1, except for the following settings and steps:

[0047] (1) In pretreatment, the dosage of ferrous sulfate in reaction tank 1 is 90g / L, the dosage of coagulant is 0.5g / L, the reaction temperature is 25℃, and the reaction gas-water ratio is 5: 1. The hydraulic retention time is 3h; the rotational speed of the mixer 10 in the sedimentation tank 9 is 60rpm, and the hydraulic retention time in the sedimentation tank 9 is 10h. After the reaction finishes, get the supernatant in the sedimentation tank 9 to detect, and measure S 2- The removal rate of ions was 72.1%, and the cyanide ion CN - The removal rate is 36.9%.

[0048] (2) In the advanced treatment, the gas-water ratio in the ozone generator 19 is 2:1, and the hydraulic retention time of the s...

Embodiment 3

[0049] Embodiment 3: as figure 1 A treatment device for desulfurization and decyanation of waste liquid of a vacuum potassium carbonate desulfurization process shown, its equipment and implementation steps are the same as in Example 1, except for the following settings and steps:

[0050] (1) In pretreatment, the dosage of ferrous sulfate in reaction tank 1 is 45g / L, the dosage of coagulant is 0.5g / L, the reaction temperature is 40℃, and the reaction gas-water ratio is 7:1 , the hydraulic retention time is 5h; the rotational speed of the mixer 10 in the sedimentation tank 9 is 150rpm, and the hydraulic retention time in the sedimentation tank 9 is 20h. After the reaction is over, take the supernatant in the sedimentation tank 9 for detection, and measure the sulfur ion S in the waste liquid. 2- The removal rate of cyanide ion CN was 57.9%. - The removal rate is 31.2%.

[0051] (2) In advanced treatment, the gas-water ratio in the ozone generator 19 is 3:1, and the hydraulic...

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Abstract

The invention discloses a device for desulfuration and decyanation treatment of waste liquid generated in the vacuum potassium carbonate desulfurization process.The device comprises a desulfuration and decyanation agent tank, a coagulant tank, a reaction pond, a settling pond and a catalytic oxidation reaction tank, wherein the desulfuration and decyanation agent tank and the coagulant tank are both communicated with the reaction pond, an inlet of the reaction pond is communicated with a waste liquid pipeline, and an outlet of the reaction pond is communicated with the settling pond; the upper portion of the settling pond is communicated with the coagulant tank, a sludge outlet of the settling pond is communicated with a sludge treatment system, a liquid outlet of the settling pond is communicated with the top of the catalytic oxidation reaction tank, and the lower portion of the catalytic oxidation reaction tank is communicated with an ozonator.The invention further discloses a method for desulfuration and decyanation treatment of waste liquid generated in the vacuum potassium carbonate desulfurization process.The device and method have the advantage that by additionally arranging a first aeration plate and a second aeration plate, waste liquid can fully react, the problem that the cyanide group and thiocyanate group in waste liquid exceed the standard is solved, and engineering application value is quite high.

Description

technical field [0001] The invention relates to the technical field of coal gas desulfurization, in particular to a treatment device and method for desulfurization and decyanation of waste liquid in a vacuum potassium carbonate desulfurization process. Background technique [0002] The vacuum potassium carbonate gas desulfurization process is one of the most widely used coke oven gas desulfurization and decyanation processes in China. This process uses poor potassium carbonate solution to absorb H in coke oven gas. 2 S and HCN and other acid gases, the absorbed potassium carbonate-rich solution becomes potassium carbonate-poor solution after vacuum analysis, and returns to the system to absorb the acid gas in the gas after heat exchange. In order to ensure the quality of the desulfurization liquid, part of the waste liquid will be discharged regularly during the desulfurization regeneration cycle of the system. This is because the side reaction will produce non-renewable sal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04B01D53/14C02F11/12C02F101/10C02F101/18C02F101/30C02F103/18
CPCC02F9/00B01D53/14C02F1/52C02F1/722C02F1/725C02F1/74C02F1/78C02F11/122C02F2101/101C02F2101/18C02F2101/30C02F2103/18C02F2201/782C02F2209/06C02F2209/42C02F2305/023C02F2305/04
Inventor 张垒陈胜春余刚强王丽娜刘璞付本全刘霞刘尚超魏琨薛改凤
Owner 武汉钢铁有限公司
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