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Resourceful treatment method for inorganic salts in ammonia desulphurization waste liquor

A technology for ammonia desulfurization and desulfurization waste liquid, which is applied in chemical instruments and methods, neutralized water/sewage treatment, oxidized water/sewage treatment, etc. Pollution and other problems, to achieve the effect of improving economic benefits and improving resource utilization

Inactive Publication Date: 2016-11-09
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high price of the membrane itself, the operation process needs to be carried out under certain pressure conditions, and the membrane is easily blocked and polluted, and the operation and maintenance costs are high. In addition, the ammonium sulfate in the wastewater has not been effectively treated

Method used

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  • Resourceful treatment method for inorganic salts in ammonia desulphurization waste liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The coking desulfurization waste liquid used in this example is the desulfurization waste liquid produced by removing hydrogen sulfide from the coking gas of the coking plant by using the HPF method. Take 500 mL of the desulfurization waste liquid. The main components of the desulfurization waste liquid are ammonium thiocyanate, thiosulfuric acid Ammonium, suspended sulfur, PDS, free ammonia, see Table 1 for details.

[0040] Table 1 Main composition of desulfurization waste liquid

[0041] Ammonium thiosulfate g·L -1

Ammonium thiocyanate g·L -1

Suspended sulfur g·L -1

PDS(ppm)

Free ammonia g·L -1

pH

90.32

140.68

0.87

49.24

5.71

8.22

[0042] In the first step, 5 g of activated carbon was added to 500 mL of ammonia desulfurization waste liquid, stirred at 20 °C for 3 h, and then filtered to obtain decolorized desulfurization waste liquid.

[0043] In the second step, the above decolorized desulfurization wa...

Embodiment 2

[0048] The coking desulfurization waste liquid used in this example is the desulfurization waste liquid produced by removing hydrogen sulfide from the coking gas of the coking plant by using the HPF method. Take 500 mL of the desulfurization waste liquid. The main components of the desulfurization waste liquid are ammonium thiocyanate, thiosulfuric acid Ammonium, suspended sulfur, PDS, free ammonia, see Table 2 for details.

[0049] Table 2 Main composition of desulfurization waste liquid

[0050] Ammonium thiosulfate g·L -1

Ammonium thiocyanate g·L -1

Suspended sulfur g·L -1

PDS(ppm)

Free ammonia g·L -1

pH

96.72

151.80

0.88

43.66

5.58

8.12

[0051] In the first step, 25 g of activated carbon was added to 500 mL of ammonia desulfurization waste liquid, stirred at 50 °C for 0.5 h, and then filtered to obtain decolorized desulfurization waste liquid.

[0052] In the second step, the desulfurization waste liquid afte...

Embodiment 3

[0057] The coking desulfurization waste liquid used in this example is the desulfurization waste liquid produced by removing hydrogen sulfide from the coking gas of the coking plant by using the HPF method. Take 500 mL of the desulfurization waste liquid. The main components of the desulfurization waste liquid are ammonium thiocyanate, thiosulfuric acid Ammonium, suspended sulfur, PDS, free ammonia, see Table 3 for details.

[0058] Table 3 Main composition of desulfurization waste liquid

[0059] Ammonium thiosulfate g·L -1

Ammonium thiocyanate g·L -1

Suspended sulfur g·L -1

PDS(ppm)

Free ammonia g·L -1

pH

58.72

164.68

0.69

40.65

5.03

8.16

[0060] In the first step, 15 g of activated carbon was added to 500 mL of ammonia desulfurization waste liquid, stirred at 80 °C for 1.5 h, and then filtered to obtain decolorized desulfurization waste liquid.

[0061] In the second step, the above decolorized desulfurization...

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Abstract

The invention discloses a resourceful treatment method for inorganic salts in ammonia desulphurization waste liquor. The method comprises the following steps: adding activated carbon into the ammonia desulphurization waste liquor for decolorization, blending decolorization filter residues and coal for coking, adding the decolorized waste liquor and sulfuric acid into a reactor, adding an oxidizing agent for stirring, performing evaporation drying to obtain a pretreated salt mixture, extracting the pretreated salt mixture for many times to obtain ammonium thiocyanate solids and SO2 by virtue of liquid sulfur dioxide, and recycling SO2. According to the method, ammonium thiocyanate in the inorganic salt mixture is extracted by virtue of the liquid sulfur dioxide, and an extraction process is simple, high in efficiency and low in energy consumption.

Description

technical field [0001] The invention relates to a treatment method for ammonia-based desulfurization waste liquid, and more specifically, a method for resourceful treatment of desulfurization waste liquid produced in the process of using ammonia-based wet oxidation to remove hydrogen sulfide in a coking plant. Background technique [0002] H in coke oven gas 2 The removal of S and HCN gas generally adopts the wet oxidation desulfurization method, in which the HPF method uses the ammonia in the coke oven gas as the absorbent, and uses the HPF as the catalyst for desulfurization and decyanation. During the desulfurization process, side reactions will occur. NH 4 SCN, (NH 4 ) 2 S 2 o 3 and other auxiliary salts, NH in desulfurization waste liquid 4 SCN, (NH 4 ) 2 S 2 o 3 When the total content is greater than 250g / L, the activity of the desulfurization catalyst will be affected, the desulfurization reaction speed will be reduced, and the desulfurization efficiency wil...

Claims

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Application Information

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IPC IPC(8): C02F9/14C01C3/20C01C1/24C02F103/18
CPCC01C1/24C01C3/20C02F1/001C02F1/048C02F1/281C02F1/283C02F1/66C02F1/72C02F1/722C02F1/727C02F1/74C02F9/00C02F2103/18
Inventor 王宏宇李国强张舒婷李涛李超张永发
Owner TAIYUAN UNIV OF TECH
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