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Method for preparing photocatalyst from desulfurization waste liquid

A technology for desulfurization waste liquid and photocatalyst, which is applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problems of poor sales, poor purity, and high cost of secondary salts, and achieves a simple operation process. , The preparation conditions and equipment requirements are not high, and the product has good economic benefits.

Active Publication Date: 2019-08-02
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems of high cost, poor purity, and poor sales of secondary salts in the existing desulfurization waste liquid, the present invention provides a photocatalytic Active g-C 3 N 4 , has the characteristics of simple operation process, low preparation conditions and equipment requirements, and good economic benefits of the product

Method used

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  • Method for preparing photocatalyst from desulfurization waste liquid
  • Method for preparing photocatalyst from desulfurization waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1: Filter the desulfurization waste liquid generated by HPF wet desulfurization to remove suspended solids and coal tar impurities in the desulfurization waste liquid to obtain clarified waste liquid;

[0030] Step 2: The hydroquinone contained in the above-mentioned clarified waste liquid is removed by membrane extraction technology, and the extractant used is ether to obtain FeSO-containing 4 , PDS, NH 4 SCN, (NH 4 ) 2 S 3 o 2 , (NH 4 ) 2 SO 4 Mixed salt solution of ingredients;

[0031] Step 3: Evaporating and concentrating the mixed salt solution to obtain a concentrated mixed salt product;

[0032] Step 4: Dry the mixed salt product, and then put it into a stainless steel reactor;

[0033] Step 5: adopt multi-step pyrolysis method to the mixed salt product in the reactor, and feed N 2 Inert atmosphere, set the heating program at a rate of 3min / °C to raise the temperature;

[0034] Step 6: Keep the temperature at 140°C for 60 minutes, control the pre...

Embodiment 2

[0044] Step 1: Filter the desulfurization waste liquid generated by HPF wet desulfurization to remove suspended solids and coal tar impurities in the desulfurization waste liquid to obtain clarified waste liquid;

[0045] Step 2: The hydroquinone contained in the above-mentioned clarified waste liquid is removed by membrane extraction technology, and the extractant used is ether to obtain FeSO-containing 4 , PDS, NH 4 SCN, (NH 4 ) 2 S 3 o 2 , (NH 4 ) 2 SO 4 Mixed salt solution of ingredients;

[0046] Step 3: Evaporating and concentrating the mixed salt solution to obtain a concentrated mixed salt product;

[0047] Step 4: Dry the mixed salt product, and then put it into a stainless steel reactor;

[0048] Step 5: Use a multi-step pyrolysis method for the mixed salt product in the reactor, and introduce an Ar inert atmosphere, and set the temperature rise program at a rate of 5min / °C to raise the temperature;

[0049] Step 6: Keep the temperature at 150°C for 90 minu...

Embodiment 3

[0059] Step 1: Filter the desulfurization waste liquid generated by HPF wet desulfurization to remove suspended solids and coal tar impurities in the desulfurization waste liquid to obtain clarified waste liquid;

[0060] Step 2: The hydroquinone contained in the above-mentioned clarified waste liquid is removed by membrane extraction technology, and the extractant used is ether to obtain FeSO-containing 4 , PDS, NH 4 SCN, (NH 4 ) 2 S 3 o 2 , (NH 4 ) 2 SO 4 Mixed salt solution of ingredients;

[0061] Step 3: Evaporating and concentrating the mixed salt solution to obtain a concentrated mixed salt product;

[0062] Step 4: Dry the mixed salt product, and then put it into a stainless steel reactor;

[0063] Step 5: Use a multi-step pyrolysis method for the mixed salt product in the reactor, and introduce an Ar inert atmosphere, and set the temperature rise program at a rate of 3min / °C to raise the temperature;

[0064] Step 6: Keep the temperature at 140°C for 90 minu...

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Abstract

The invention provides a method for preparing a photocatalyst from a desulfurization waste liquid, belongs to the technical field of preparation of the photocatalyst, and solves the problems that byproduct salt extracted from the conventional liquid waste is high in cost and poor in purity and has bad sales and the like. G-C3N4 with photocatalytic activity is prepared from the desulfurization waste liquid as a raw material by evaporation, concentration, crystallization, segmented pyrolysis and the like, and the method has the characteristics that the operating process is simple, requirements for preparation conditions and equipment are not high and the economic benefit of products is good.

Description

technical field [0001] The invention belongs to the technical field of photocatalyst preparation, in particular to a method for preparing g-C by using desulfurization waste liquid as raw material 3 N 4 photocatalytic method. Background technique [0002] The HPF wet desulfurization process using ammonia as the alkali source is widely used in coke oven gas; during the desulfurization process, the NH continuously generated in the desulfurization liquid 4 SCN, (NH 4 ) 2 S 3 o 2 , (NH 4 ) 2 SO 4 After the salt content reaches a certain value, the desulfurization efficiency will decrease significantly, and a certain amount of desulfurization liquid needs to be replaced regularly to maintain the balance of the total salt content in the desulfurization liquid. In this process, a large amount of desulfurization waste liquid will be generated, which needs to be effectively treated. . [0003] At present, desulfurization waste liquid is mainly processed by coal blending coki...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/08C02F1/30C02F101/30
CPCB01J27/24B01J37/082C02F1/30C02F2101/308C02F2305/10B01J35/39
Inventor 段丽媛李国强张舒婷李超王宏宇赵永乐李涛张永发
Owner TAIYUAN UNIV OF TECH
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