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Method for preparing cuprous thiocyanate by using ammonia-process coking desulfurization waste liquid

A technology of coking desulfurization waste liquid and cuprous thiocyanate, which is applied in the direction of thiocyanate and ammonium sulfate, to achieve the effect of improving economic benefits and solving poor sales

Inactive Publication Date: 2018-09-11
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, ammonium sulfate is extracted from ammonium sulfate coarse salt, and ammonium thiocyanate, copper sulfate, and ammonia water generate cuprous thiocyanate, but ammonium thiosulfate is not processed.

Method used

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  • Method for preparing cuprous thiocyanate by using ammonia-process coking desulfurization waste liquid
  • Method for preparing cuprous thiocyanate by using ammonia-process coking desulfurization waste liquid
  • Method for preparing cuprous thiocyanate by using ammonia-process coking desulfurization waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 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, ammonium sulfate, suspended sulfur, PDS, free ammonia.

[0032] In the first step, 195.3 mL of 28 wt.% ammonia water was added to 500 mL of saturated copper sulfate solution, stirred to make it fully react, and 8.75 L of 99.99% SO 2 Gas (Cu 2+ : NH 4 + : SO 2 =2:4:1, the unit is the molar ratio), to obtain the copper source precursor, to collect and purify the tail gas;

[0033] The second step, the preparation of thiocyanate precursor

[0034] Ⅰ. Add 5 g of activated carbon to 500 mL of ammonia desulfurization waste liquid, stir at 80 °C for 180 min, and then filter to obtain decolorized desulfurization waste liqu...

Embodiment 2

[0041] 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.

[0042] In the first step, add 218.75 mL of 5 wt.% ammonia water to 500 mL of 5% copper sulfate solution, stir to make it fully react, and pass 3.85 L of 50% SO 2 Gas (Cu 2+ : NH 4 + : SO 2 =2:4:1.1, the unit is the molar ratio) to obtain the copper source precursor, and the tail gas is collected and purified;

[0043] The second step, the preparation of thiocyanate precursor

[0044] Ⅰ. Add 25 g of activated carbon to 500 mL of ammonia desulfurization waste liquid, stir for 120 min at a temperature of 20 °C, and then filter to obtain decolorized desulfurization waste liquid....

Embodiment 3

[0051] 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.

[0052] In the first step, add 218.75 mL of 20wt.% ammonia water to 500 mL of 15% copper sulfate solution, stir to make it fully react, and pass 9.8 L of 75% SO 2 Gas (Cu 2+ : NH 4 + : SO 2 =2:4:1.05, the unit is the molar ratio), to obtain the copper source precursor, the tail gas is collected and purified;

[0053] The second step, the preparation of thiocyanate precursor

[0054] Ⅰ. Add 15 g of activated carbon to 500 mL of ammonia desulfurization waste liquid, stir for 90 min at a temperature of 50 °C, and then filter to obtain decolorized desulfurization waste liquid.

...

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Abstract

A method for preparing cuprous thiocyanate by using ammonia-process coking desulfurization waste liquid is disclosed. The method comprises the following steps: adding ammonia water to a saturated copper sulfate solution and introducing sulfur dioxide gas to obtain a copper source precursor, and then adding activated carbon into ammonia-process desulfurization waste liquid and stirring for decoloration and filtering to obtain decolored desulfurization waste liquid, stirring the decolored desulfurization waste liquid with sulfuric acid and adding an oxidizing agent for treatment, drying to obtain pretreated salt-mixture, adding liquid sulfur dioxide to the pretreated salt-mixture and stirring to obtain primary and secondary extracting solutions, combining the primary and secondary extractingsolutions to obtain a thiocyanate precursor, finally mixing the copper source precursor with the thiocyanate precursor and stirring to carry out a reaction, separating by filtration, washing filter residue to obtain cuprous thiocyanate, and evaporating and drying a filtrate to obtain ammonium sulfate. By the above method, the conversion of ammonium thiocyanate to downstream high added-value products is realized, the problem that the sale of ammonium thiocyanate is not smooth and the overstocking is serious is solved, the economic benefit is improved, and the dual purposes of treatment and synthesis of the desulfurization waste liquid are achieved.

Description

technical field [0001] The invention relates to a method for preparing cuprous thiocyanate, in particular to a method for preparing cuprous thiocyanate by using the desulfurization waste liquid produced in the process of removing hydrogen sulfide by ammonia wet oxidation in a coking plant. Background technique [0002] Desulfurization waste liquid is a large amount of SCN produced in the process of removing acidic substances such as hydrogen sulfide in gas in coking plants. - , S 2 o 3 2- , SO 4 2- , SO 3 2- Pollutants with extremely harmful substances such as COD, sulfide, and ammonia nitrogen far exceed the requirements of the biochemical treatment inlet of the coking plant, so they cannot be directly treated by biochemical methods, and their discharge or leakage will cause serious environmental accidents. Therefore, recycling the valuable components is the preferred method to deal with desulfurization waste liquid, which can not only solve environmental problems, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/20C01C1/24
CPCC01C1/24C01C3/20
Inventor 王宏宇李国强张舒婷李源王影张静张永发
Owner TAIYUAN UNIV OF TECH
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