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Method for removing sulfides in coking wastewater

A technology for coking wastewater and sulfide, applied in chemical instruments and methods, oxidized water/sewage treatment, water/sewage treatment, etc., can solve the problems of easy pollution of the environment, high cost, and low efficiency, and achieve obvious treatment effects and oxidation Powerful, easy-to-handle effects

Inactive Publication Date: 2015-06-10
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The sulfide removal methods in wastewater have their own advantages and disadvantages: although the air oxidation method and the acidification absorption method are easy to operate and the equipment is simple, they are not efficient and may easily cause hydrogen sulfide to enter the air to pollute the environment; the chemical precipitation method and the adsorption method have quick results. However, the consumption of chemicals is large and the cost is high; the advanced oxidation method has high efficiency, but has high requirements on the reactor and expensive investment; the biochemical method has a small investment, but its stability is not as good as that of the physicochemical method, and it is not suitable for wastewater with high sulfide concentration.
[0011] At present, the main problems of various sulfide removal technologies in coking wastewater are as follows: 1. The removal efficiency is not high, and it is easy to pollute the environment; 2. The investment is expensive and the cost is high; 3. The engineering application stability is not enough

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Put 25 g of CDQ particles with a particle size of 250 mesh into a closed carbonization chamber under N 2 Heat up to 850°C for 1 hour under gas protection;

[0032] (2) After the above-mentioned particles are taken out and cooled to room temperature, they are placed in a 15% KOH solution (wt, mass concentration) at 80°C for 2 hours, and then placed in a 32% KOH solution at 80°C. 2 CO 3 The solution is oxidized and modified, and the treatment time is 1h to increase the adsorption performance of CDQ;

[0033] (3) The modified CDQ coke particles are dried in an oven at 100° C. to obtain a modified activated carbon-like material.

[0034] (4) drop 5 g of this type of activated carbon material into 100 ml of coking wastewater, and rotate it on a magnetic stirrer (200 r / min) for 0.5 h at normal temperature;

[0035] (5) Filter the treated coking wastewater, then add 5mlH 2 o 2 , rotate on a magnetic stirrer (100r / min) for 0.5h at room temperature;

[0036] (6) After ...

Embodiment 2

[0038] (1) Put 30 g of CDQ particles with a particle size of 300 mesh into a closed carbonization chamber under N 2 Heat up to 750°C for 2 hours under gas protection;

[0039] (2) After the above-mentioned particles are taken out and cooled to room temperature, they are placed in a 30% KOH solution (wt, mass concentration) at 85°C for 2 hours, and then placed in a 35% KOH solution at 60°C. 2 CO 3 The solution is oxidized and modified, and the treatment time is 3 hours to increase the adsorption performance of CDQ;

[0040] (3) Dry the modified CDQ coke particles in an oven at 130° C. to obtain a modified activated carbon-like material.

[0041] (4) 10 g of this type of activated carbon material is dropped into 200 ml of coking wastewater, and rotated on a magnetic stirrer (200 r / min) for 3 h at normal temperature;

[0042] (5) Filter the treated coking wastewater, then add 10ml of H 2 o 2 , rotate on a magnetic stirrer (100r / min) for 1h at room temperature;

[0043] (6) ...

Embodiment 3

[0045] (1) Put 30 g of CDQ particles with a particle size of 80 mesh into a closed carbonization chamber under N 2 Heat up to 800°C for 3 hours under gas protection;

[0046] (2) After the above particles are taken out and cooled to room temperature, they are placed in a 50% NaOH solution (wt, mass concentration) at 100°C for 2 hours, and then placed in a 30% K solution at 70°C. 2 CO 3 The solution is oxidized and modified, and the treatment time is 2 hours to increase the adsorption performance of CDQ;

[0047] (3) Dry the modified CDQ coke particles in an oven at 150°C to obtain a modified activated carbon-like material.

[0048] (4) drop 15 g of this type of activated carbon material into 300 ml of coking wastewater, and rotate it on a magnetic stirrer (200 r / min) for 2 h at normal temperature;

[0049] (5) Filter the treated coking wastewater, then add 10ml of H 2 o 2 , rotate on a magnetic stirrer (100r / min) for 0.8h at room temperature;

[0050] (6) After the above...

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Abstract

The invention discloses a method for removing sulfides in coking wastewater. The method comprises the following steps of: (1) putting dry-quenched coke particles into an airtight carbonization chamber, and heating for 1-3 hours under the protection of N2 gas to increase the temperature to the range from 750 to 850 DEG C; (2) taking out the dry-quenched coke particles and cooling the coke particles until the temperature of the dry-quenched coke particles reaches the room temperature, and then putting the dry-quenched coke particles into an alkaline liquor activator, and furthermore, putting the dry-quenched coke particles into a K2CO3 solution for oxidizing modification to improve the adsorption performance of the coke particles; (3) drying the modified coke particles in an oven, thus obtaining a modified similar activated carbon material; (4) feeding the similar activated carbon material into coking wastewater, and rotating on a magnetic stirrer at the normal temperature; and (5) filtering the coking wastewater treated previously, and then adding H2O2, and rotating by using the magnetic stirrer at the normal temperature to remove the sulfides in the wastewater. On one hand, the method is capable of remarkably improving the sulfide removal efficiency; and on the other hand, the method is capable of reducing the cost of removing the sulfides from the coking wastewater, realizing recycling of partial solid wastes and thus achieving the purpose of energy conservation and environmental protection.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a method for removing sulfides in coking wastewater. Background technique [0002] With the rapid development of my country's industry, a large amount of sulfide has entered into the wastewater. Because the sulfide is poisonous and harmful, it has caused a great threat to the ecological environment. In recent years, with the further strengthening of the country's environmental protection requirements, and in order to ensure the long-term stable and reliable operation of the entire water treatment process and equipment, it is particularly urgent to adopt appropriate methods to effectively treat sulfide in wastewater. [0003] The sulfide components of wastewater discharged from different industries vary greatly, and the treatment methods are also different. Common processing methods are as follows: [0004] ①Acidification absorption method: by adding acid to sulfur-containing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F1/72C02F1/58
Inventor 刘璞薛改凤张垒王丽娜刘尚超付本全黄建阳
Owner 武汉钢铁有限公司
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