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Reclamation of ammonium sulfocyanate and ammonium thiosulfate from coke oven gas ammonia liquid phase catalysis waste water

A technology of liquid phase catalysis and coke oven gas, which is applied in the fields of thiocyanate, thiosulfate/dithionite/polythionate, water/sewage treatment, etc., which can solve the problem of small device scale and equipment utilization rate Low, unable to implement continuous production and other issues

Inactive Publication Date: 2008-03-19
苏州市浒关焦炉煤气三废治理厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the built recycled NH 4 The scale of the CNS device is small, the liquid-solid separation has strict requirements on the components, continuous production cannot be implemented, the labor intensity of production is high, and the utilization rate of equipment is low.

Method used

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  • Reclamation of ammonium sulfocyanate and ammonium thiosulfate from coke oven gas ammonia liquid phase catalysis waste water
  • Reclamation of ammonium sulfocyanate and ammonium thiosulfate from coke oven gas ammonia liquid phase catalysis waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Recovery of ammonium thiocyanate and ammonium thiosulfate from coke oven gas ammonia water liquid-phase catalytic desulfurization and decyanation wastewater

[0074] (1) Evaporation and solid-liquid separation

[0075] Evaporation: 1000 grams of decolorized wastewater [NH 4 CNS23.78%, (NH 4 ) 2 S 2 o 3 7.26%, (NH 4 ) 2 SO 4 5.81%, H 2 O63.15%], add 1000 grams of circulating mother liquor, evaporate under reduced pressure at 75-80 ° C, and remove 632 grams of water to obtain concentrated slurry.

[0076] Solid-liquid separation: the concentrated slurry was separated at 45-60° C. to obtain 1267 grams of the first liquid phase and 100 grams of the first filter cake. Wherein the content of each component in the first filter cake is as follows: NH 4 CNS7.24%, (NH 4 ) 2 S 2 o 3 29.02%, (NH 4 ) 2 SO 4 55.49%, H 2 O4.57%, insoluble matter 3.68% (Fig. 2).

[0077] (2) NH 4 CNS crystallization separation

[0078] 1267 g of the first liquid phase was cooled to...

Embodiment 2

[0084] Recovery of ammonium thiocyanate from coke oven gas ammonia water liquid-phase catalytic desulfurization and decyanation wastewater

[0085] (1) Evaporation and solid-liquid separation

[0086] Evaporation: 5750 g of decolorized wastewater [NH 4 CNS13.18%, (NH 4 ) 2 S 2 o 3 8.40%, (NH 4 ) 2 SO 4 4.14%, H 2 [074.28%], add 1490 grams of circulating mother liquor returned, concentrate under reduced pressure at 73-81 ° C, remove 4684 grams of water, and obtain concentrated slurry.

[0087] Solid-liquid separation: the concentrated slurry was separated at 45-60° C. to obtain 1938 grams of the first liquid phase and 481 grams of the first filter cake. (figure 2)

[0088] (2) NH 4 CNS crystallization separation

[0089] 1938 grams of the first liquid phase was cooled to 25-30 ° C, and 335 grams of finished product NH4CNS were separated. The composition of the finished product is as follows: NH 4 CNS96.55%, (NH 4 ) 2 S 2 o 3 0.72%, (NH 4 ) 2 SO 4 0.37%, H ...

Embodiment 3

[0091] Recovery of ammonium thiosulfate from coke oven gas ammonia water liquid phase catalytic desulfurization and decyanation wastewater

[0092] (1) Dissolution (NH 4 ) 2 S 2 o 3

[0093] 100 grams of mother liquor and 4.15 grams of water after reclaiming ammonium thiosulfate are added to 100 grams of the first filter cake after extracting ammonium thiocyanate, and the above materials are stirred, heated to 90°C for dissolution (NH 4 ) 2 S 2 o 3 , the composition of the first residue is: (NH 4 ) 2 S 2 o 3 52.80%, NH 4 CNS1.35%, (NH 4 ) 2 SO 4 24.77%, H 2 O15.22%, water insoluble matter 5.86%. Through liquid-solid separation, 43 grams of the second filter cake and 157 grams of the second liquid phase were obtained. The main components in the second filter cake are ammonium sulfate, water insoluble matter and attached liquid. (NBM in Figure 4)

[0094] (2)(NH 4 ) 2 S 2 o 3 crystal separation

[0095] Add (NH 4 ) 2 S 2 o 3 About 16 grams of finished...

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Abstract

The invention uses the principle of a water solution phase diagram of a multi-component system to reclaim the NH4 CNS and the (NH4)2S2O3 from the ammonia water liquid phase catalytic waste water of the coke oven gas respectively. The content of the reclaimed NH4 CNS can reach greater than or equal to 95 percent, and the dried content of the NH4 CNS can reach greater than or equal to 98 percent. The content of the reclaimed (NH4)2S2O3 can reach greater than or equal to 93 percent, and the dried content of the (NH4)2S2O3 can reach greater than or equal to 97 percent. The NH4 CNS can be continuously evaporated during the reclamation process of the invention; the liquid and solid separation is processed in at a continuous normal temperature; the continuous crystallization, the high equipment coefficient and the increasing treatment content accord with the requirements of big plants. The invention successfully solves the environmental pollution of the desulphurization and decyanation waste water of the coke oven gas, and reclaims the main components in the waste water. The invention is characterized in an improved and simplified process, a practical and reliable technology and a low cost etc.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a method for recovering coke oven gas ammonia water liquid-phase catalytic desulfurization and decyanation waste water. More specifically, the present invention relates to a method for simultaneously recovering ammonium thiocyanate and ammonium thiosulfate from coke oven gas ammonia liquid phase catalytic wastewater. Background technique [0002] In my country, coke oven gas ammonia water liquid-phase catalytic desulfurization and decyanation process has developed rapidly due to its obvious technical and economic advantages. In 1987, the Chinese successfully solved the problem of recovering ammonium thiocyanate (NH 4 CNS) technology (CN1034349A), successively set up two places to reclaim NH from waste water 4 CNS production facility. NH in wastewater 4 The successful recovery of CNS has also promoted the development of domestic coke oven gas ammonia water liquid-phase cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C01C3/20C01B17/64
Inventor 戴开义钱德芳王大宜钱俊戴珏钱夏
Owner 苏州市浒关焦炉煤气三废治理厂
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