Genetic Differences in Raw Materials and Processes
Although biochar and coke are both black solids, their origins are distinctly different:
Biochar: Derived from agricultural and forestry waste such as plant stalks and fruit husks, it undergoes oxygen-limited pyrolysis at 400-700℃, like giving organic matter a "low-temperature spa," preserving its porous structure.
Coke: Derived from coal through dry distillation at over 1000℃, equivalent to "hellish forging" of coal, resulting in a carbon content of over 90% and low porosity.
The Secret of Physical Properties
Under a microscope, they look like two different types of "honeycombs":
Specific surface area: Biochar can reach 300 m²/g (equivalent to a football field), while coke is usually less than 50 m²/g.
Adsorption capacity: Biochar can adsorb 20% of its own weight in pollutants, while coke is mainly used for combustion and heat generation.
pH value: Biochar is alkaline (pH 8-10), while coke is close to neutral.
The Watershed of Application Scenarios
These "carbon brothers" shine in their respective fields:
Biochar: A "nutritionist" for soil improvement, an "environmental guardian" for carbon dioxide sequestration, and also used for treating wastewater and exhaust gases.
Coke: An "energy package" for steel smelting, a "heat source" for the casting industry, and partly used in the manufacture of chemical raw materials such as calcium carbide.
