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Recycling method and device of salt-containing coking desulfurization waste liquid

A technology of salt-containing waste liquid, coking desulfurization, applied in chemical instruments and methods, filtration treatment, separation methods, etc., can solve problems such as corrosion of metal flue equipment environment, neglect of exhaust gas, pollution, etc., to reduce equipment corrosion damage and cost. Inexpensive, easy-to-use effects

Inactive Publication Date: 2018-05-29
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this plan ignores the treatment of tail gas. The process of drying and extracting crude salt by spray dryer will produce a large amount of high-temperature acid gas. High-temperature acid gas not only easily corrodes metal flue equipment but also pollutes the environment.

Method used

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  • Recycling method and device of salt-containing coking desulfurization waste liquid
  • Recycling method and device of salt-containing coking desulfurization waste liquid
  • Recycling method and device of salt-containing coking desulfurization waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The coking desulfurization salt-containing waste liquid in Example 1 comes from Wuhan Iron and Steel No. 1 steelmaking desulfurization waste liquid. The desulfurization section uses sodium carbonate as the alkali source for desulfurization. The main components of the coking desulfurization salt-containing waste liquid are sodium thiocyanate and thiosulfuric acid. Sodium, suspended sulfur. combine figure 1 and figure 2 As shown, the resource treatment method of coking desulfurization salt-containing waste liquid in this embodiment includes the following steps:

[0031] 1) Removal of elemental sulfur: Coking desulfurization salt-containing waste liquid is centrifuged in a centrifuge at a centrifugal rate of 4000 rpm for 3 minutes to obtain a supernatant waste liquid, which is separated and removed from the elemental sulfur precipitate;

[0032] 2) Decolorization: Add activated carbon to the supernatant waste liquid for decolorization treatment, then filter the activate...

Embodiment 2

[0041] The coking desulfurization salt-containing waste liquid in Example 2 comes from Wuhan Iron and Steel No. 1 steelmaking desulfurization waste liquid. The desulfurization section uses sodium carbonate as the alkali source for desulfurization. The main components of the coking desulfurization salt-containing waste liquid are sodium thiocyanate and thiosulfuric acid. Sodium, suspended sulfur. to combine figure 1 and figure 2 As shown, the resource treatment method of coking desulfurization salt-containing waste liquid in this embodiment includes the following steps:

[0042] 1) Removal of elemental sulfur: Coking desulfurization salt-containing waste liquid is centrifuged in a centrifuge at a centrifugal rate of 6000 rpm for 4 minutes to obtain a supernatant waste liquid, which is separated and removed from the elemental sulfur precipitate;

[0043] 2) Decolorization: Add activated carbon to the supernatant waste liquid for decolorization treatment, and then filter the a...

Embodiment 3

[0051] The coking desulfurization salt-containing waste liquid in Example 3 comes from the desulfurization waste liquid of the coking plant of Hubei Xinye Steel Co., Ltd. The desulfurization section uses ammonia as the alkali source for desulfurization. The main components of the coking desulfurization salt-containing waste liquid are ammonium thiocyanate, Ammonium Thiosulfate, Suspended Sulfur. to combine figure 1 and figure 2 As shown, the resource treatment method of coking desulfurization salt-containing waste liquid in this embodiment includes the following steps:

[0052] 1) Removal of elemental sulfur: Coking desulfurization salt-containing waste liquid is centrifuged in a centrifuge at a centrifugation rate of 10,000 rpm and a centrifugation time of 5 minutes to obtain a supernatant waste liquid, which is separated and removed from the elemental sulfur precipitate;

[0053] 2) Decolorization: Add activated carbon to the supernatant waste liquid for decolorization tr...

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Abstract

The invention relates to the field of waste liquid treatment technologies, particularly to a recycling method and device of a salt-containing coking desulfurization waste liquid. The recycling methodcomprises the steps as follows: 1) the salt-containing coking desulfurization waste liquid is centrifuged, a supernatant waste liquid is obtained, and elemental sulfur precipitate is removed; 2) activated carbon is added to the supernatant waste liquid for decolorization treatment, then, activated carbon is filtered out, and a decolorized waste liquid is obtained; 3) the decolorized waste liquid is delivered to a spray dryer for spray drying separation treatment, and dried crude salt and tail gas containing vapor, particulate impurities and acid gas are obtained; 4) the tail gas is firstly subjected to condensation cooling treatment, vapor in the tail gas is condensed into a condensate to be recycled, then, the tail gas subjected to condensation cooling is introduced into a dust remover for removal of particulate impurities in the tail gas, finally, the dust-removed tail gas is introduced into a tail gas absorption solution for removal of acid gas, and then, the tail gas is exhausted into the atmosphere. Crude salt in the salt-containing coking desulfurization waste liquid can be recycled and emission pollution by wastewater and waste gas can be remarkably reduced with the method.

Description

technical field [0001] The invention relates to the field of waste liquid treatment technology, in particular to a resource treatment method and device for coking desulfurization salty waste liquid. Background technique [0002] According to national statistics in 2012, there are a total of 810 large and small coking plants in operation across the country, with an annual output of more than 440 million tons of coke and a total of 4.1 million tons of desulfurization waste liquid produced each year. Desulfurization waste liquid has complex components, high content of toxic substances, strong corrosion, and large discharge volume, so it is quite difficult to treat it harmlessly. At present, the desulfurization of coking plants adopts wet desulfurization, that is, industrial sodium carbonate or ammonia is used as the alkali source for desulfurization. This method has low cost and simple operation, but the desulfurization waste liquid contains a large amount of thiocyanate and th...

Claims

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Application Information

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IPC IPC(8): C02F9/10B01D53/18B01D45/12B01D5/00C02F103/36
CPCB01D5/00B01D45/12B01D53/1456B01D53/18C02F1/001C02F1/12C02F1/283C02F1/38C02F9/00C02F2103/365
Inventor 何龙王光华李文兵王晴东陈哲胡林王凯顾万凯
Owner WUHAN UNIV OF SCI & TECH
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