Regeneration method of powdered active carbon

A technology of powdered activated carbon and activated carbon, which is applied in separation methods, filter regeneration, chemical instruments and methods, etc., can solve the problem that the decolorization power of recycled powdered activated carbon, iron salts, and ash content cannot meet the requirements of high-end users, and the surface chemistry of recycled activated carbon can be solved. Structural changes are reduced in strength, and powdered activated carbon has a high rate of loss on ignition, which can improve product profit margins, low ash content, and high decolorization power.

Inactive Publication Date: 2020-04-17
刘德庆
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the industrial production of regenerated powdered activated carbon is mainly based on the heating regeneration method. This method produces regenerated powdered activated carbon. Carbon monoxide and flue gas pollute the environment and the air seriously, and the loss rate of powdered activated carbon is high. The surface chemistry of regenerated activated carbon The structure changes and the strength decreases, and the decolorization power, iron salt, ash and other indicators of the recycled powdered activated carbon cannot meet the requirements of high-end users. Due to the increasingly severe environmental protection situation, production is basically stopped, and all the primary powdered activated carbon used in industry is burned by itself. , resulting in a waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Put 260Kg of sodium hydroxide solution with a mass percentage concentration of 30%-40%, 380 Kg of industrial salt and 2.5T of clean water into the pool, and then put 1T of waste activated carbon into the container, stir for 7 minutes, and feed in a pressure of 1.5- 2Mpa saturated steam to heat the feed liquid to the boiling state under normal pressure, and keep the boiling state for 1.5 hours; then add 100Kg of industrial grade hydrogen peroxide, stir for 7 minutes, continue to pass the saturated steam with a pressure of 1.5-2Mpa to heat to the boiling state, and then keep 1.5 hour; stop the steam heating, add clean water to rinse the feed solution to pH7-8; add 210Kg of hydrochloric acid with a mass concentration of 30% in the container, and feed the saturated steam with a pressure of 1.5-2Mpa to be heated to a boiling state under normal pressure and keep Boiling state for 1.5 hours; stop steam heating, add clean water to rinse the material liquid several times to pH6.5...

Embodiment 2

[0020] Put 240Kg of sodium hydroxide solution with a mass percentage concentration of 30%-40% in the pool, 360 Kg of industrial salt and 2T of clean water, and then put 1T of waste activated carbon into the container, stir for 5 minutes, and introduce a pressure of 1.5-2Mpa Saturated steam to heat the feed liquid to a boiling state under normal pressure, and keep boiling for 2 hours; then add 90Kg of industrial grade hydrogen peroxide, stir for 5 minutes, continue to pass saturated steam with a pressure of 1.5-2Mpa to heat to boiling state, and keep for 1 hour ;Stop steam heating, add clean water to rinse the feed solution to pH7-8; add 200Kg of hydrochloric acid with a mass concentration of 31% in the container, and feed in a pressure of 1.5-2Mpa saturated steam to heat to a boiling state under normal pressure and keep boiling state for 2 hours; stop steam heating, add clean water to rinse the feed liquid several times to pH6.5-7; feed liquid is dried and dehydrated or filtere...

Embodiment 3

[0022] Put 280Kg of sodium hydroxide solution with a mass percentage concentration of 30%-40%, 400 Kg of industrial salt and 2.5T of clean water into the pool, and then put 1T of waste activated carbon into the container, stir for 10 minutes, and feed in a pressure of 1.5- 2Mpa saturated steam to heat the feed liquid to the boiling state under normal pressure, and keep the boiling state for 1 hour; then add 110Kg of industrial grade hydrogen peroxide, stir for 10 minutes, continue to pass the saturated steam with a pressure of 1.5-2Mpa to heat to the boiling state, and then keep 1.5 Hours; stop steam heating, add clean water to rinse the feed liquid to pH7-8; add 220Kg of hydrochloric acid with a mass concentration of 31% in the container, and feed in a pressure of 1.5-2Mpa saturated steam to heat to a boiling state under normal pressure, keep Boiling state for 1 hour; stop steam heating, add clean water to rinse the material liquid several times to pH6.5-7; the material liquid...

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PUM

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Abstract

The invention relates to a regeneration method of powdered active carbon. The regeneration method comprises the following steps: adding a sodium hydroxide solution, an industrial edible salt, clean water and waste active carbon into a container, and heating and cooking the material liquid through saturated steam; adding hydrogen peroxide, and heating and cooling through steam; adding clean water,rinsing several times, adding hydrochloric acid, heating and cooking, and carrying out spin-drying and dehydrating on the rinsed material liquid or carrying out plate frame filtering to obtain a wet carbon finished product; and further drying and dedusting to obtain a powdery active carbon dry-type finished product. The method is simple in process and high in operability, and the obtained active carbon finished product is high in decolorization force and low in ferric salt and ash content; a large amount of dust, CO, H2 and other gases generated by a heating regeneration method are effectivelysolved; and the used raw materials are industrial-grade, so that the production cost can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of activated carbon preparation, in particular to a method for regenerating powdered activated carbon. Background technique [0002] Activated carbon, also known as activated carbon, is a carbonaceous adsorption material with a highly developed pore structure and a large specific surface area. Its main application performance is its strong adsorption capacity for various substances, and it has been widely used in many fields. application. Such as decolorization and impurity removal in the food industry, decolorization and depyrogenation in the pharmaceutical industry and sewage treatment fields. With the continuous development of society, the application of activated carbon will be more extensive. During the adsorption process of activated carbon, the adsorbate and solvent are adsorbed for a certain period of time to reach the adsorption equilibrium, and the regeneration of activated carbon is to destroy t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/34
CPCB01J20/20B01J20/3416
Inventor 刘德庆刘瑞军
Owner 刘德庆
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