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A method for preparing high-quality ammonium sulfate from coking desulfurization and decyanation waste liquid

A technology of coking desulfurization and ammonium sulfate, which is applied in the field of comprehensive utilization of waste resources, can solve the problems of embedding, coke sulfur content increase, and ammonium sulfate impurity content, and achieve the effect of simple process and low cost

Active Publication Date: 2021-07-30
江苏燎原环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the thermal strength of coke has no great influence, it will increase the sulfur content of coke and reduce the quality grade of coke
Although the desulfurization liquid can temporarily solve the problem of desulfurization waste liquid treatment after being mixed with coal blending, but the sulfur re-enters the gas circulation system during coke production, and part of the accumulated sulfur still needs to be removed again, resulting in an increase in the load of the desulfurization system
[0007] Some coking enterprises recycle desulfurization waste liquid to extract ammonium salt, which partially solves the problem of desulfurization waste liquid treatment, but the ammonium sulfate impurity content in the extracted ammonium salt is extremely large, and the crystal particles are very small, or flaky crystals, and there are large crystals. The large defects, impurities embedded or formed in the defects, cannot be separated completely; due to the existence of a large number of impurities in the output ammonium sulfate, ammonium sulfate has no application value, and eventually becomes secondary solid waste

Method used

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  • A method for preparing high-quality ammonium sulfate from coking desulfurization and decyanation waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Coking desulfurization and decyanation waste liquid indicators: ammonium thiocyanate: 152g / L; ammonium sulfate: 71g / L; ammonium thiosulfate: 47g / L; pH: 8.5; volatile ammonia: 6g / L; and PDS: 40mg / L .

[0025] Take 1000g of waste liquid, first add 20g of acid additive ammonium bisulfate to the waste liquid, adjust the pH of the waste liquid to 6, add 2g of activated carbon and stir for about 15 minutes to decolorize, filter to remove activated carbon residue, add 0.3g of crystal habit changer magnesium sulfate , and then concentrated and evaporated to produce 550g of water, then cooled to 75°C, and the vacuum degree was -0.087MPa. At this time, most of the ammonium sulfate had crystallized, and it was separated by centrifugation at 70°C, and then passed through 20ml of ammonium sulfate saturated solution. After rinsing, 86g of product ammonium sulfate was finally obtained, and ammonium thiocyanate and ammonium thiosulfate could be further separated by centrifuging the mot...

Embodiment 2

[0027] Coking desulfurization and decyanation waste liquid indicators: ammonium thiocyanate: 160g / L; ammonium sulfate: 75g / L; ammonium thiosulfate: 60g / L; pH: 9; volatile ammonia: 6.5g / L; and PDS: 45mg / L L.

[0028] Take 1000g of waste liquid, first add 23g of acid additive ammonium bisulfate to the waste liquid, adjust the pH of the waste liquid to about 6.5, add 2.5g of activated carbon and stir for about 15 minutes to decolorize, filter to remove activated carbon residue, add crystal habit change agent magnesium sulfate 0.2g, then concentrated and evaporated to produce 450g of water, then cooled to 80°C, and the vacuum degree was -0.09MPa. At this time, most of the ammonium sulfate had crystallized, and it was separated by centrifugation at 80°C, and then saturated with 20ml of ammonium sulfate The solution was rinsed to finally obtain 92 g of product ammonium sulfate, and the centrifuged mother liquor could further separate ammonium thiocyanate and ammonium thiosulfate; by...

Embodiment 3

[0030] Coking desulfurization and decyanation waste liquid indicators: ammonium thiocyanate: 148g / L; ammonium sulfate: 58g / L; ammonium thiosulfate: 52g / L; pH: 8; volatile ammonia 5.2g / L; and PDS: 34mg / L .

[0031] Take 1000g of waste liquid, first add 18g of acid additive ammonium bisulfate to the waste liquid, adjust the pH of the waste liquid to about 6.5, add 2g of activated carbon and stir for about 15 minutes to decolorize, filter to remove the activated carbon residue, add crystal habit change agent magnesium sulfate 0.2 g, and then concentrated and evaporated to 480g of water, then cooled to 76°C, and the vacuum degree was -0.087MPa. At this time, most of the ammonium sulfate had crystallized, and it was separated by centrifugation at 72°C, and then passed through 20ml of ammonium sulfate saturated solution Carry out rinsing, finally obtain product ammonium sulfate 86g, centrifuge mother liquor can further separate ammonium thiocyanate and ammonium thiosulfate; By measu...

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Abstract

The invention discloses a method for preparing high-quality ammonium sulfate by using coking desulfurization and decyanation waste liquid, which belongs to the technical field of comprehensive utilization of waste resources. The method first adjusts the pH through an auxiliary agent, then adds a decolorizing agent for decolorization, and then adds a crystal habit to change agent, evaporate and concentrate, and control the sum of the concentrations of ammonium thiocyanate and ammonium thiosulfate to be 60%-80%. High-purity ammonium sulfate can be prepared by rinsing with ammonium saturated solution. This method is simple in process and low in cost. The ammonium sulfate crystals produced are in regular granular shape, with a weight content of more than 99% and a nitrogen content of more than 20.5%. , can achieve the expected effect, and provide a better method for the treatment of coking desulfurization and decyanation waste liquid, which is green and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of waste resources, and in particular relates to a method for preparing high-quality ammonium sulfate by utilizing coking desulfurization and decyanation waste liquid. Background technique [0002] At present, the desulfurization process of some large coking plants in China generally adopts the ammonia gas desulfurization technology, referred to as the HPF process. Wet oxidative desulfurization method of ammonium-ferrous sulfate (HPF) composite catalyst. First, acidic components such as hydrogen sulfide in the gas are converted into acidic ammonium salts such as ammonium hydrogen sulfide, and then converted into elemental sulfur by air oxidation. [0003] The coal gas enters the desulfurization tower after being pre-cooled, and contacts with the desulfurization liquid sprayed on the top of the tower countercurrently to absorb hydrogen sulfide and hydrogen cyanide in the gas, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/248
CPCC01C1/248C01P2006/80
Inventor 陈昌
Owner 江苏燎原环保科技股份有限公司