CN1071642A

CN1071642A - Make high-grade coal mass active carbon by chemical treatment

Info

Publication number: CN1071642A
Application number: CN91109799A
Authority: CN
Inventors: 王大为
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-10-16
Filing date: 1991-10-16
Publication date: 1993-05-05

Abstract

The present invention relates to a kind of use chemical reagent coal mass active carbon is handled, remove wherein soluble harmful substances, make ash content reduce to 4-8%, thereby obtain the method for top-grade active carbon.Belong to deep process technology to gac.This method has improved the quality of product greatly, has eliminated obstacle for the abundant activation of gac simultaneously, and making with the expensive coconut husk charcoal of coal mass active carbon replacement becomes possibility.

Description

Make high-grade coal mass active carbon by chemical treatment

The present invention utilizes chemical reagent that coal mass active carbon is handled, and removes wherein soluble harmful substances, thereby obtains top-grade active carbon.

Because raw material and complete processing aspect, the ash content of coal is higher in the coal mass active carbon of China's production at present, in standard GB 7701-87, to the various ash of gac, as total ash, water-soluble ash, solubility in acid ash or the like, does not all do regulation.But be used for industries such as water treatment, food, pharmacy, catalyzer along with gac, bring pollution impurity into, begin to improve requirement gradually the ash content of coal in order to prevent it.China's activated carbon product is used for foreign exchange earning in a large number, and countries such as the U.S., Japan, Europe require more and more strict to the content of ash wherein.Therefore reduce the content of ash in the gac, become each manufacturer problem anxious to be solved.

The ash of coal mass active carbon is generally between 10-20%.Though each manufacturer has taked many measures for reducing ash, as selects the raw coal of low ash, artificial coal separation, coal washing, flotation or the like for use, effect is all little.And along with the raising of activation of activated carbon, ash also is on the increase, and is above standard in order not make the ash content of coal, has to reduce activation degree, so the control of ash has hindered the raising of other activity index of gac again.

The high gear gac that uses in the world mainly is a cocoanut active charcoal at present, and its ash is generally less than 5%, and China's coconut husk shortage of resources will spend a large amount of foreign exchanges from external import.

China and simple use acid treatment gac is abroad arranged for a long time reducing the method for its ash, but only be applicable to wood activated charcoal, be used for then poor effect of coal mass active carbon.

The present invention has adopted soda acid jointly coal mass active carbon to be handled, and can make its total ash reduce to 4-8% from original 10-20%, and the solubility ash is then removed fully.This method is for the high more gac of activation degree, the high more gac of the ash content of coal just, and treatment effect is good more.And technology is simple, and is easy to operate, and processing units and processing cost are not high yet.Use method of the present invention, can improve the quality of gac greatly, making with coal mass active carbon replacement coconut husk charcoal becomes possibility.

The present invention is according to the difference that product P H value is required and different.When the needs product is acidity, then earlier use alkaline purification, use acid treatment again; When the needs product is alkalescence, then earlier use acid treatment, use alkaline purification again.The pH value of product can be regulated between 2-13 as requested.

Specific measures for implementation of the present invention are: the coal mass active carbon of getting 30 parts of weight, the alkali (or acid of 1-15%) that is 1-15% with 50 parts of concentration mixes, heated and boiled 3 hours, wash with water then, after control is done, mix with the acid (or alkali of 1-15%) of 50 parts 1-15% again, heated and boiled 3 hours, washing, oven dry promptly obtains required product.

Provide three embodiment below.

Embodiment one: gets the columnar activated carbon of the Φ 3.0mm of 30 parts of weight, mixes, boiled 3 hours with 50 parts of 10%HCl, and washing, control is done, and mixes with 50 parts 9% NaOH again, boils 3 hours, and washing is dried.

Embodiment two: gets the columnar activated carbon of the Φ 1.5mm of 30 parts of weight, mixes, boiled 3 hours with 50 parts 9% NaOH, and washing, control is done, and mixes with 50 parts 10% HCl again, boils 3 hours, and washing is dried.

Embodiment three: gets the broken gac of 12 * 40 orders of 30 parts of weight, mixes, boiled 3 hours with 50 parts 5% NaOH, and washing, control is done, and mixes with 50 parts 5% HCl again, boils 3 hours, washes, and dries.

The result of above-mentioned three embodiment is as follows:

Claims

1, a kind of acid-alkali treatment coal mass active carbon of using is removed wherein soluble harmful substances, thereby improves the method for quality of activated carbon.It is characterized in that:

A. at high temperature handle jointly with soda acid, can require the different precedence of soda acid use and the degree of washing of changing according to pH value to product.

B. according to the difference of pending quality product, the concentration of acid can change between 1-15%, and the concentration of alkali can change between 1-15%.