Comparative study on the effects of organic acid and inorganic acid on the pore structure and mineral composition of coal
Wang Zhijian 1, Yang Xiaoguo1, Hao Jun1, Wang Peng1, Liang Feng 2, Sun Gongshuai * 3
1. Yuwu Coal Industry Co., Ltd., Shanxi Lu 'an Group, Changzhi 046103, China; 2. Shandong Sanhekou Mining Co., Ltd., Jining 277600, China; 3. Shandong University of Science and Technology Mine Disaster Prevention and Control of the Ministry of Construction of the State Key Laboratory Training Base, Qingdao 266590, China
Abstract： In order to study the dissolution of different types of acids on coal and provide a theoretical basis for the selection of acid fracturing fluid under different geological conditions, this paper takes formic acid ( organic acid ) and hydrofluoric acid ( inorganic acid ) as the representative to dissolve coal. Scanning electron microscopy and X-ray diffraction were used to explore the pore structure and mineral composition. The results show that the corrosion effect of hydrofluoric acid and formic acid is different. The surface pores of hydrofluoric acid treated coal samples are sharp and sharp, and the surface pores of formic acid treated coal samples are round and smooth. Hydrofluoric acid can largely remove the mineral impurities in raw coal, so that the pores are sharp and sharp. Formic acid can remove inorganic carbonates such as calcite, and it does not react with inorganic minerals such as kaolinite, and migrates some minerals to the edge of the pores, so that the pores are round and smooth.
王志坚1，杨晓国1，郝 军1，王 鹏1，梁 锋2，孙功帅3*. 有机酸与无机酸对煤体孔隙结构和矿物组分的影响对比研究[J]. 煤炭与化工, 2023, 46(12): 90-93.
Wang Zhijian 1, Yang Xiaoguo1, Hao Jun1, Wang Peng1, Liang Feng 2, Sun Gongshuai * 3. Comparative study on the effects of organic acid and inorganic acid on the pore structure and mineral composition of coal. CCI, 2023, 46(12): 90-93.
