Heap leaching of activated carbon pellets impregnated with sodium hydroxide

Impregnated activated carbon uses high-quality activated carbon as a carrier and is refined through impregnation. It has three characteristics: activity, selectivity and stability. It has good adsorption and catalytic properties and high-efficiency comprehensive anti-poisoning.

 

Impregnated activated carbon uses high-quality activated carbon as a carrier and is refined through impregnation. It has three characteristics: activity, selectivity and stability. It has good adsorption and catalytic properties and high-efficiency comprehensive anti-poisoning.  

Impregnated NAOH content: 6.0-8.0%

Particle size: 4mm

Note: It can be produced according to customer needs.

It is used to comprehensively protect various poisonous gases such as chlorides and arsenides, and can also protect harmful gases such as acidic gases, ammonia, and carbon monoxide. The desiccant can effectively absorb water vapor in the gas.  

It has been widely used in the defense industry, industrial hygiene, environmental protection, etc. to effectively protect against toxic and harmful gases. Coal-based impregnated activated carbon is made from coal-based granular activated carbon with high adsorption performance, impregnated with alkaline solutions such as potassium hydroxide and sodium hydroxide, and then cremated and dried at 130°-180°. It is widely used in Remove organic gases and vapors from air or other gas streams, such as hydrogen sulfide, sulfur dioxide, etc.  

Activated carbon is a porous carbon-containing substance with a highly developed pore structure. It is an excellent adsorbent. The adsorption area per gram of activated carbon is equivalent to eight tennis courts. Its adsorption effect is achieved by It is achieved by physical adsorption and chemical adsorption. In addition to the carbon element, its composition also contains a small amount of hydrogen, nitrogen, oxygen and ash, and its structure is composed of carbon forming six rings. Due to the irregular arrangement of the six-ring carbon, activated carbon has the characteristics of microporous volume and high surface area.  

Activated carbon can be made from many kinds of carbon-containing substances, including wood, sawdust, coal, coke, peat, lignin, fruit cores, hard nut shells, cane syrup meal, bones, lignite, petroleum residues, etc. Among them, coal and coconut shell have become the most commonly used raw materials for making activated carbon. The manufacturing of activated carbon is basically divided into two processes. The first process includes dehydration and carbonization. The raw materials are heated, dried at a temperature of 170 to 600°C, and about 80% of the original organic matter is carbonized. The second process is to activate the char. This is accomplished by reacting with charcoal using an activator such as water vapor. In the endothermic reaction, a mixed gas composed of CO and H2 is mainly produced, which is used to burn and heat the char to the appropriate temperature (800°C). to （1000℃) to burn out all decomposable substances, resulting in a developed microporous structure and a huge specific surface area, so it has strong adsorption capacity.  

The pores of activated carbon can be divided into three categories according to the size of the pores.

Large hole: radius 1000 - 1000000 A.

Transition hole: radius 20 - 1000 A.

Micropore: Radius - 20 A.  

Activated carbon made from different raw materials has different pore sizes.

Activated carbon made from coconut shells has the smallest pore radius. Wooden activated carbons generally have the largest pore radii, they are used to adsorb larger molecules and are used almost exclusively in the liquid phase. The first type of granular activated carbon used in urban water treatment was made from wood and was called charcoal. The pore size of coal-based activated carbon is between the two.  

Among coal-based activated carbons, lignite activated carbon has more transition pores and a larger average pore size than anthracite activated carbon, so it can effectively remove macromolecular organic matter in water.  The surface area of ​​activated carbon generally used in water treatment is not necessarily too large, but it should have more transition pores and a larger average pore size. Some liquid-phase activated carbons sold on the Japanese market have the following characteristics:

specific surface area is 850 to 1000m2/g,

pore volume is 0.88 to 1.5ml/g,

and average pore radius is 40 to 50A.

Introduction to activated carbon functions:  

Activated carbon has an efficient air purification function. Activated carbon can create a comfortable and clean environment. Activated carbon also protects human health. Activated carbon is an invisible air filter. Activated carbon decomposes formaldehyde in the air with its combined physical adsorption and chemical decomposition functions. , ammonia, benzene, cigarettes, oil fumes and other harmful gases and various odors, especially carcinogenic aromatic substances. Activated carbon has extremely strong adsorption capacity and is a commonly used adsorbent, catalyst or catalyst carrier. It can easily mix with the air. The harmful gases in the activated carbon are fully exposed to each other, and the activated carbon uses its own pore adsorption to suck harmful gas molecules into the pores and blow out fresh and clean air. So family partners cannot do without activated carbon.

Applications of activated carbon  

Activated carbon is widely used in all aspects of industrial and agricultural production, such as alkali-free deodorization (refined demercaptan) in the petrochemical industry, ethylene desalted water (refined filler), catalyst carrier (palladium, platinum, rhodium, etc.), water purification and sewage treatment; electric power Power plant water quality treatment and protection in the industry; chemical catalysts and carriers, gas purification, solvent recovery, and decolorization and refining of oils and greases in the chemical industry; refining and decolorization of beverages, alcohol, MSG mother liquor, and food in the food industry; gold in the gold industry Extraction and tail liquid recovery; sewage treatment, waste gas and harmful gas control, and gas purification in the environmental protection industry; as well as cigarette filters, wooden floor moisture-proofing, odor absorption, automobile gasoline evaporation pollution control, and preparation of various impregnation liquids in related industries wait. Activated carbon will have excellent development prospects and a broad sales market in the future.