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A desulfurization liquid salt extraction process and its device

A technology of desulfurization liquid and process, which is applied in the field of desulfurization liquid salt extraction process and its devices, can solve the problems of large influence of raw material concentration, fluctuating quality, high processing cost, etc., and achieve the goal of reducing investment cost, reducing reaction time and high reactivity Effect

Active Publication Date: 2022-01-07
HENAN ZHONGHONG GRP COAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above-mentioned systems, desulfurization waste liquid generally needs to go through many processes such as double-stage filtration, activated carbon decolorization, vacuum evaporation, etc. The process is complicated and the treatment cost is high
There is also a commonly used desulfurization liquid salt extraction technology as the fractional crystallization method. This method is to separate the sulfate, thiocyanate, and thiosulfate by means of multiple concentrations, crystallization, dissolution, and separation. , this kind of process is more complicated, the investment is higher, and the product is greatly affected by the concentration of raw materials, and the quality fluctuates

Method used

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  • A desulfurization liquid salt extraction process and its device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A desulfurization liquid salt extraction device, such as figure 1 As shown, it includes a desulfurization liquid vacuum evaporator 1, and an acidolysis reaction kettle 2 sequentially connected with the desulfurization liquid vacuum evaporator 1, a first filter press 3, a first vacuum evaporator 5 and a second filter press 6, the desulfurization The liquid vacuum evaporator 1 is also connected with the first heat exchanger 8, the first heat exchanger 8 is also connected with the first vacuum pump 9, the acidolysis reaction kettle 2 is also connected with the ammonia water pool 7, and the first filter press 3 is also connected in sequence Stirring tank 17, melting sulfur still 4, the second vacuum evaporator 18 and the 3rd filter press 24, the first vacuum evaporator 5 is also connected with the second heat exchanger 10, and the second heat exchanger 10 is also connected with the second vacuum pump 11, the second vacuum evaporator 18 is also connected to the third heat ex...

Embodiment 2

[0034] The desulfurization liquid salt extracting device used in this embodiment is the same as that in Embodiment 1.

[0035] Using the above device to carry out the desulfurization liquid salt extraction process includes the following steps:

[0036] (1) Measure 1L of Na containing from MTS catalytic desulfurization 2 S 2 o 3 、Na 2 SO 4 , NaSCN, Na 2 CO 3、 NaHCO 3 The desulfurized liquid such as salt is sent into the desulfurized liquid vacuum evaporator 1 by the pump 14, and the vacuum in the desulfurized liquid vacuum evaporator 1 is adjusted by the first heat exchanger 8 connected to the desulfurized liquid vacuum evaporator 1 and the first vacuum pump 9 The temperature is less than -0.05MPa, the temperature is 100°C, and then the desulfurization liquid is concentrated until there is no salt precipitation at high temperature;

[0037] (2) Transport the desulfurized liquid concentrated in step (1) to the acidolysis reactor 2 by pump 14, add sulfuric acid solution w...

Embodiment 3

[0043] The desulfurization liquid salt extracting device used in this embodiment is the same as that in Embodiment 1.

[0044] Using the above device to carry out the desulfurization liquid salt extraction process includes the following steps:

[0045] (1) Measure 1L of Na containing from MTS catalytic desulfurization 2 S 2 o 3 、Na 2 SO 4 , NaSCN, Na 2 CO 3、 NaHCO 3 The desulfurized liquid such as salt is sent into the desulfurized liquid vacuum evaporator 1 by the pump 14, and the vacuum in the desulfurized liquid vacuum evaporator 1 is adjusted by the first heat exchanger 8 connected to the desulfurized liquid vacuum evaporator 1 and the first vacuum pump 9 The temperature is less than -0.05MPa, the temperature is 110°C, and then the desulfurization solution is concentrated until there is no salt precipitation at high temperature;

[0046] (2) Transport the desulfurized liquid concentrated in step (1) to acidolysis reactor 2 by pump 14, add sulfuric acid solution wit...

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Abstract

The invention discloses a process for extracting salt from a desulfurization solution and a device thereof, comprising the following steps: concentrating the desulfurization solution; performing acidolysis reaction on the concentrated desulfurization solution, and then adjusting it to neutrality with NaOH; pressing the neutral solution to separate the solid from the liquid , after the solid dissolves, heat and release sulfur in the sulfur melting kettle to precipitate sulfur. 2 SO 4 Mainly solid; Concentrate the neutral liquid obtained by press filtration, and precipitates after cooling; Press filter the liquid and precipitate, separate the solid and liquid, and obtain the solid mainly containing NaSCN, and the filtrate is returned to the desulfurization liquid vacuum evaporator Combine with desulfurization liquid and concentrate again. The invention provides a process and a device for extracting salt from desulfurization liquid with reduced investment cost, simplified process flow, shortened reaction time, reduced energy consumption and higher purity of sodium thiocyanate.

Description

technical field [0001] The invention belongs to the technical field of desulfurization liquid purification, and in particular relates to a process for extracting salt from a desulfurization liquid and a device thereof. Background technique [0002] In coke production, the raw gas produced by the coke oven must be purified by the system before it can be put into practical use. Coke oven gas desulfurization waste liquid is the high-salt waste liquid generated during the desulfurization and purification process of raw coal gas. Desulfurization waste liquid is currently the main source of pollution in coking enterprises and must be treated. Salt extraction is a desulfurization waste liquid treatment process that has been developed in recent years. It uses a series of physical and chemical means to purify various inorganic salts in waste liquid into pure industrial products, so as to eliminate pollution and recycle resources. Purpose. [0003] At present, there are many method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/10C02F103/18
CPCC02F9/00C02F1/001C02F1/04C02F1/66C02F2101/10C02F2103/18
Inventor 李红超艾护民彭亚伟毕雅梅牛鑫杨娜娜余远航鲁帅夏艳铝李鹏举徐仲
Owner HENAN ZHONGHONG GRP COAL