压块工艺条件下煤种对活性炭孔结构发育的影响

以胜利褐煤、3种低阶烟煤（灵武煤、神木煤、大同煤）和太西无烟煤为原料，采用压块工艺制备煤质颗粒活性炭，借助煤中无机矿物质组分与含量、炭化料微晶结构参数等指标考察煤种对活性炭孔结构发育的影响。结果表明：① 随着煤化程度（Cdaf）的提高，炭化料的微晶层厚度（Lc）和石墨化度(G)升高，活性炭的比表面积（SBET）增大，平均孔径（da）减小；② 煤中的矿物质含量和组成对活性炭的孔结构发育亦有重要影响，灰分过高意味着可以造孔的有机炭含量降低，但无机质中Ca，Fe等物质会催化活化反应，促进活性炭孔的发育。压块工艺条件下，煤种（煤化程度）仍然主要通过影响炭化料内微晶尺度和矿物质组成来影响最终所得活性炭的孔结构。

Effect of coalification degree of coals on the porosity of coal-based granular activated carbon prepared by briquetting method

A series of granular activated carbons (GACs) were prepared by briquetting method from five typical Chinese coals of different coalification degrees (Shengli lignite，three subbituminous coals including Lingwu coal，Shenmu coal and Datong coal，and Taixi anthracite).The effects of coalification degree on the pore structure development of activated carbon were investigated with the aids of the mineral constitution and content of the coal and the crystalline parameters of the char.The results show that:① layer thickness (Lc) and graphitization degree (G) increase with the increase of the coalification degree (Cdaf)，which leads to larger BET specific surface area (SBET) and smaller average diameter (da) of the activated carbon；② Mineral matters in the coal also affect the pore structure of activated carbon significantly:high mineral content means less organic carbons available for pores shaping while Fe-and Ca-containing minerals in the char catalyze the gasification reaction，promoting pore structure development.The pore structure of activated carbon prepared by briquetting method is highly affected by coalification degree because chars with different crystalline sizes and mineral constitutions are formed after carbonization.