五种生物质炭的特性分析

Characteristic analysis of five biochars

以南北方5种农林废弃物水稻壳、果壳、花生壳、玉米秸秆和竹子为原料,采用限氧控温法制备生物质炭,分析生物质炭的基本性质及结构特征。结果表明:5种生物质炭呈碱性,炭化结构清晰良好,呈疏松多孔结构;竹炭的pH值、灰分含量、电导率和阳离子交换量显著高于秸秆类炭和壳渣类炭,500℃热裂解条件下竹炭适合作为土壤改良剂;花生壳炭平均孔径最大且为多孔隙结构,表明有最佳的组成与结构用于重金属的吸附固定。

In this paper,five kinds of agricultural and forestry wastes in south and north China,including rice husk,nut shell,peanut hull,corn stalk and bamboo,were used as raw materials to prepare biomass carbon by oxygen-limited temperature control method.The basic properties and structural characteristics of biochar were analyzed.The results showed that the five kinds of biochar were alkaline,the carbonized structure was clear and good and showed porous structure.The pH,conductivity,CEC and ash content of bamboo charcoal were significantly higher than that of straw carbon and shell slag.It is considered that bamboo charcoal is suitable as a soil improve under the thermal cracking condition at 500°C.Peanut shell charcoal has the largest average pore size and a porous structure,indicating they have the best composition and structure that could be used for adsorption and fixation of heavy metals.