Activated carbon is only a kind of activated carbon, and the subdivision is hundreds of types of activated carbon.
The quality of activated carbon varies with the raw materials for production, production methods, and post-treatment. Quality also varies by application. Generally, activated carbon for various purposes is formulated with corresponding quality specifications and inspection methods.
The projects on the quality specifications of various uses of Chinese and foreign activated carbon are summarized as follows:
(1) Physical items: shape, appearance; mesh size, particle size, particle size distribution; apparent density, packing density; abrasion resistance; hardness; specific surface area; pore volume; floating rate; strength; heat capacity;
(2) Chemical items: pH value; ash; moisture, dry weight loss; ignition point; no carbonized matter, burning residue; sulfide; chloride; cyanide; sulfate; acid soluble, nitric acid soluble; Iron content; copper content; zinc content; potassium content; calcium and magnesium content; heavy metal content; water extraction; cadmium content; arsenic content; total nitrogen; phosphate; manganese; fluorescent substance; polycyclic aromaticized whole; tar product. (vegetable raw materials)
(3) Microbial project: microbial limit.
(4) adsorption project; methylene blue adsorption value; iodine adsorption value; phenol adsorption value; carbon tetrachloride adsorption value; caramel decolorization rate; decolorization index; quinine sulfate adsorption value; molasses value; saturated sulfur capacity; Sulfur capacity; benzene vapor protection time, benzene activity; chloroethane vapor protection time; water capacity; butane working capacity; ABS value; toluene balance activity.
Activated carbon products are often expressed in terms of use, such as sugar, MSG, medicinal, injection, gold, water, carrier, and the like. Some products list specifications, some are not listed, and some of them are the same as those listed for that purpose. Some key items may be internal controls and will not be marked.
Activated carbon sometimes has problems with pass or fail in applications. The countermeasures are: the quality project of activated carbon, especially the special charcoal, should emphasize the applicability project, and also emphasize the feasibility of usage. Foreign countries claim to have 40 or more types of activated carbon companies, with different quality to meet different needs, multi-quality has a variety of models - a wide variety of code models. For example, coconut charcoal has a variety of quality and corresponding models: one for water treatment applications to remove low concentrations of organic matter, one for general liquid or gas phase applications, one for gold extraction applications; each subdivided to give coconut shells More than ten models; as well as recycled carbon reactivated from waste carbon, its quality is outstanding high density, high surface area, durability, repeated regeneration, about ten models. It can be seen that there are many varieties that can be changed from quality.
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