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Raw material recovery method from active carbon produced by chemical method

A technology for the production of activated carbon and recovery methods, which is applied to chemical instruments and methods, separation methods, and separation of dispersed particles. It can solve problems such as hazards, corrosion of pipelines and equipment, and unrecyclable raw material phosphoric acid, and achieve the effect of protecting the ecological environment.

Inactive Publication Date: 2006-04-05
傅太平
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Problems solved by technology

However, in the production of activated carbon by chemical method, a large amount of high-concentration phosphoric acid-containing waste gas is emitted, which causes serious harm to the surrounding environment, especially the phosphoric acid and zinc chloride activation method is more serious. According to estimates, the cost of activated carbon per ton produced The waste gas produced is about 30000~86000m 3 / h
In this regard, the traditional solution is water washing, but because the corresponding acid is formed after water absorption, which seriously corrodes the pipeline and equipment, and the raw material phosphoric acid cannot be recycled, which wastes resources in vain

Method used

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  • Raw material recovery method from active carbon produced by chemical method
  • Raw material recovery method from active carbon produced by chemical method

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Embodiment Construction

[0029] The following embodiments will further illustrate the present invention in conjunction with the accompanying drawings.

[0030] Depend on figure 1 Visible, establish phosphoric acid recovery tower A2 (referring to in the waste gas outlet of rotary kiln A1 figure 2 ), the recovery tower is made of phenolic fiberglass. The dilute acid recovered by the recovery tower is precipitated and cooled by the three-stage acid liquid precipitation cooling circulation pool A31, A32, A33, and the acid liquid precipitation cooling circulation pool A31~A33 is lined with phenolic glass fiber reinforced plastic layer. The absorption liquid obtained from the acid liquid precipitation cooling circulation pool is sent back to the phosphoric acid recovery tower A2 through the phosphoric acid circulation pump A4, and the liquid that reaches a certain concentration is sent to the production workshop A5, and the dilute acid liquid is replaced again. The ash and slag obtained in the acid liqui...

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Abstract

A process for recovering phosphoric acid and zinc chloride in the chemical production of activated carbon by use of phenolic glass includes such steps as preparing phenolic glass from phenolic resin and glass fibres, making washing tower with said phenolic glass, spreading said phenolic glass in two circulating pools to form their lining layers, introducing the waste gas of rotary kiln to absorption tower to recover diluted phosphoric acid, depositing while cooling, returning absorbing liquid back to absorption tower, separating dregs from liquid, introducing the liquid to circulating pool, washing the primary cleaned gas in washing tower, depositing the dreg liquid, separating washing liquid from acidic liquid, returning the washing liquid back to washing tower, and introducing the acidic liquid to another circulating pool.

Description

(1) Technical field [0001] The invention relates to a method for recycling industrial waste gas, in particular to a method for recycling phosphoric acid and zinc chloride in chemical activated carbon production by using phenolic glass. (2) Background technology [0002] Usually, wood chips, the leftovers after wood processing, are the primary raw materials for the production of activated carbon. The chemical method of phosphoric acid and zinc chloride can be used for low-temperature carbonization. Phosphoric acid can dehydrate and oxidize materials, so that materials can be carbonized and oxidized at low temperature. The project has low material consumption, low cost and good effect, especially an effective way to develop characteristic industries in mountainous areas. However, in the production of activated carbon by chemical method, a large amount of high-concentration phosphoric acid-containing waste gas is emitted, which causes serious harm to the surrounding environment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/08B01D53/46
Inventor 傅太平
Owner 傅太平
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