Method for recovering sodium sulfocyanate from desulfurized and decyanated wastewater of coke-oven gas

A technology for desulfurization, decyanation, and sodium thiocyanate, applied in thiocyanic acid and other directions, can solve the problems of unreasonable economic benefits, increased recycling burden, and high equipment requirements, and achieve the effects of low cost, novel technology, and elimination of environmental pollution.

Inactive Publication Date: 2012-02-01
苏州久王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

To remove these substances increases the recycling burden, and this method requires high equipment, high production costs, and economic benefits are not worth it.

Method used

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  • Method for recovering sodium sulfocyanate from desulfurized and decyanated wastewater of coke-oven gas
  • Method for recovering sodium sulfocyanate from desulfurized and decyanated wastewater of coke-oven gas

Examples

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Comparison scheme
Effect test

example 1

[0016] Step 1: Evaporation and liquid-solid separation 1

[0017] 3002 grams of decolorizing solution (component: NaCNS: 4.92%, Na 2 S 2 o 3 : 5.56%, Na 2 SO 4 : 1.66%, Na 2 CO 3 : 1.60%, H 2 O: 82.26%) add 750 grams of circulating mother liquor that returns, concentrate (can decompress) and remove 2070ml of water, then separate at 60°C-80°C to obtain the first filtrate 1242ml, solid (1) 156.2g (component: NaCNS: 4.12 %, Na 2 S 2 o 3 : 5.08%, Na 2 SO 4 : 41.89%, Na 2 CO 3 : 45.71%, H 2 O: 3.2%).

[0018] Step 2: Evaporation and liquid-solid separation 2

[0019] The first separated filtrate 1242ml evaporated to remove water again to obtain concentrated slurry, and carried out secondary separation at 60°C-90°C to obtain the second filtrate 705ml, solid (2) 248.5 grams (component: NaCNS: 15.74%, NaCNS: 15.74%, Na 2 S 2 o 3 : 74.12%, Na 2 SO 4 : 3.33%, Na 2 CO 3 : 2.71%, H 2 O: 4.10%).

[0020] The third step: crystallization and separation of NaCNS

[0...

example 2

[0023] Step 1: Evaporation and liquid-solid separation 1

[0024] 3815 grams of decolorizing solution (component: NaCNS: 5.56%, Na 2 S 2 o 3 : 7.72%, Na 2 SO 4 : 1.84%, Na 2 CO 3 : 1.78%, H 2 (O: 83.10%) adds 670 grams of circulating mother liquor that returns, concentrates (can decompress) and removes 2516ml of water, separates the first filtrate 1360ml, solid (1) 135.2 grams (component: NaCNS: 4.66%, Na 2 S 2 o 3 : 6.50%, Na 2 SO 4 : 43.12%, Na 2 CO 3 : 42.92%, H 2 O: 2.8%).

[0025] Step 2: Evaporation and liquid-solid separation 2

[0026]The first separated filtrate 1360ml is evaporated to remove water to obtain concentrated slurry again, carries out secondary separation at 60 ℃-90 ℃, obtains the second filtrate 787ml, solid (2) 382 grams (component: NaCNS: 13.96%, NaCNS: 13.96%, Na 2 S 2 o 3 : 76.38%, Na 2 SO 4 : 2.88%, Na 2 CO 3 : 2.24%, H 2 O: 4.54%).

[0027] The third step: crystallization and separation of NaCNS

[0028] After the filtrate 7...

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Abstract

The invention discloses a method for recovering sodium sulfocyanate from coke-oven gas wastewater that is desulfurized and decyanated through a sodium alkali method. Belonging to a pure physical separation technology, the method of the invention has no need for additional accessories to take part in a reaction and does not discharge any wastewater and waste material to the outside, thus really reaching the purposes of eliminating environmental pollution, utilizing waste materials, change waste materials into things of value and realizing circular economy. The method provided in the invention has the advantages of novel technology, simple process, low cost, advanced technique, and practical applicability.

Description

technical field [0001] The invention relates to a method for recovering sodium thiocyanate from coke oven gas sodium-alkali desulfurization and decyanation wastewater, belonging to the technical field of wastewater treatment. Background technique [0002] With the increasingly stringent national environmental protection regulations and the continuous enhancement of people's environmental awareness, H in coke oven gas of coking plants 2 S, HCN, NH 3 The pollution of atmospheric environment by combustion products and desulfurization and decyanation wastewater has become increasingly prominent, seriously affecting the sustainable development of my country's coking industry. Therefore, in addition to the purification treatment of desulfurization and decyanation of coke oven gas, it is imperative to treat the waste liquid of desulfurization and decyanation. [0003] Removal of H in the domestic desulfurization and decyanation process 2 S, HCN must use alkaline desulfurization ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/20
Inventor 王宏明金月英吴惠芳
Owner 苏州久王环保科技股份有限公司
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