Analysis of ash content of activated carbon

Date:Apr 7,2017
In recent years, with the popularization and application of activated carbon, activated carbon all of the parameters are understood, but relatively speaking, it is known that activated carbon index is limited to the iodine adsorption value, and the ash index understanding in many customers is not enough, the activated carbon ash index in the industry application a brief analysis to share with you.
The chemical composition of activated carbon in addition to carbon elements, but also contains two substances, one is a chemical bond with the elements, such as oxygen and hydrogen, and the other is ash, ash with different types of activated carbon. The activated carbon of different ash content and composition are very different, such as coconut shell activated carbon as an example, the charcoal ash content is about 3.5%, which contains potassium, aluminum, silicon, sodium and iron oxide and a small amount of magnesium, calcium, boron, copper, silver, tin and trace lithium lead, gallium, etc.. The relative content of ash in activated carbon increased with the activation degree of carbon. Coconut shell charcoal ash less than 3%, while coal activated carbon ash 00amv 10% ~ 30%, sulfur content in active carbon is relatively low, good quality activated carbon not detected in sulfide. In general, we say that the activated carbon powder refers to the gray powder. Ash can be divided into acid soluble and alkali soluble. Ash content mainly includes: three silica, two aluminum oxide, ferric oxide, calcium oxide, titanium dioxide, sulfur dioxide, Magnesium Oxide, three, potassium oxide and sodium oxide and phosphorus pentoxide.
Activated carbon ash detection method:
The influence of activated carbon ash and ash in some water purification filter:
L water purification activated carbon particles in the ash powder is large, easy to cause the production of filter is dirty, the scene is the appearance of black; if the second kind of activated carbon with easy to cause the rear part of the filter clogging in the pre filter; third in the post carbon may cause a black phenomenon. The lower the ash content is, the lower the DPS of the effluent water quality is, the lower the ash content of the conventional coconut shell carbon is <3%, and the 10%-30% can reach <1-2% after acid washing;
Effect of activated carbon ash and ash on partial air purification:
The columnar activated carbon powder is large, there are two reasons, one is the poor strength of activated carbon, the collision friction is easy to produce powder, second is due to influence the production process of raw materials ratio or process parameters; when the active carbon used in air purification filter in easy dirty cleaning machine, leakage powder; cause processing difficulties, when used in non-woven sandwich or drop powder interlayer shedding phenomenon; treatment by adsorption tower too much dust in the exhaust gas is easy to cause larger airflow obstruction, wind resistance.
Effect of activated carbon ash and ash on air treatment of waste incineration:
Carbon itself is activated carbon powder - waste incineration ash index, purity, its relative influence of carbon, activated carbon adsorption is mainly used in flue gas treatment of dioxins and heavy metals in waste incineration ash, the influence degree of low carbon <10%-15% waste incineration ash;
Effect of activated carbon ash and ash on food and pharmaceutical industry:
- food grade activated carbon with powdered activated carbon, ash directly affect the purity of the products and liquid phase PH, due to the serious pollution two, try to choose a low ash content of activated carbon is used activated carbon.
In the manufacturing process, activation process made adverse effects are most of inorganic ash. Specific inorganic ash, such as alkali metal, such as copper and iron oxides and carbonates, the catalytic effect of carbon and water vapor reaction of alkali metal compounds (such as K, Na and carbonate hydroxide) can promote the formation of slitlike pores in activated carbon; catalysis of inorganic mineral matter on carbon reaction and the water vapor makes the pores of activated carbon from small to large, resulting in the hole (hole transition) and macroporous activated carbon increased, decreased surface area.

TypeInfo: Industry news

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