Acid washed activated carbon

Acid washing activated carbon, as the name suggests, is activated carbon that has been acid treated and washed. Acid washing activated carbon is usually for granular activated carbon, including coconut shell activated carbon and coal-based activated carbon. Acid-washed coconut shell activated carbon is mostly used in the field of household drinking water, while the latter is mostly used in the chemical and food industries.

Due to the rapidly increasing demand for drinking water purification by households and individuals, and the natural characteristics of coconut shell activated carbon that are easier to meet sanitation and safety standards (mainly heavy metal indicators), the coconut shell activated carbon market has achieved significant growth.

The main purposes or objectives of Acid washing coconut shell activated carbon are: 1) Reduce the content of heavy metals (if any) in coconut shell activated carbon to meet the requirements of relevant standards, such as China's wading material safety standard GB5749-2006 Or the American industry standard NSF42 standard; 2) Reduce the pH value and the TDS value of the filtered water. The pH value of conventional coconut shell charcoal is 8-10, while the pH of pickled coconut shell charcoal is usually 5-8; 3) Shorten the activated carbon carbon. Installation and flushing time at the filling site of the tank (Owner acceptance usually requires flushing without obvious black water and reaching a certain pH range. In fact, the dust can be solved without Acid washing)

Therefore, rigorously pickled coconut shell activated carbon has great advantages in household water purification and process reverse osmosis systems.

The acid-washed coal-based activated carbon can be used for the purification of electronic grade phosphoric acid and high-purity hydrochloric acid; the decolorization of fructose and glucose, the decolorization of edible fats or industrial fats, etc.

The main goal of coal-based activated carbon Acid washing is to reduce the ash content, including various metal ions. In this way, the activated carbon will not introduce new impurities to the target product during the purification process of high-purity phosphoric acid or hydrochloric acid. The iron ion content and acid-soluble ash content are usually used as important indicators of acid-washed coal-based activated carbon.

Because Acid washing treatment has specific benefits and advantages for the use of activated carbon, users are usually willing to pay for the increased cost of Acid washing activated carbon. However, the few black sheep and rat feces in the activated carbon industry are shoddy. For example, spray acid on activated carbon instead of soaking and rinsing with acid. In this way, the pH value cannot be detected by light detection. Some customers reported that the acid-washed activated carbon purchased from a certain purchase was filled into the filter element of a household water purifier. When the water was passed for the first time, the plastic shell of the filter element was obviously hot. After analysis, it was concluded that the acid-sprayed activated carbon was obtained. In addition, due to the country's strict control over the use of hydrochloric acid in recent years (because it is a precursor to drugs and requires investment in environmental protection equipment), some factories use the water washing process to pretend to be Acid washing. In fact, this does not reduce the acid-soluble ash content in activated carbon.