Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Method for preparing blocky aerogel from coal gangue
The invention relates to a method for preparing blocky aerogel by using coal gangue. The method comprises the following steps: firstly, crushing the coal gangue, calcining and activating, carrying out acid leaching, and filtering to obtain an aluminum-rich solution and acid leaching residues; dropwise adding ammonia water into the aluminum-rich solution to adjust the pH value to 3-4, standing, filtering, continuously dropwise adding ammonia water into the filtrate to adjust the pH value to 4-6 to obtain an aluminum hydroxide suspension, generating boehmite fibers from the suspension under a hydrothermal condition, and washing the boehmite fibers to prepare sol for later use; dissolving the acid leaching residues in a NaOH solution, and dropwise adding hydrochloric acid to adjust the pH value to 2-4 to prepare silicon dioxide sol; the preparation method comprises the following steps: uniformly mixing and stirring boehmite fiber sol and silicon dioxide sol, dropwise adding ammonia water to obtain wet gel, and carrying out hydrophobic modification, solvent replacement and drying on the wet gel to obtain blocky aerogel. The method is simple in process and low in cost, silicon and aluminum elements in the coal gangue can be fully utilized, and the prepared blocky aerogel is complete in structure, high in porosity, good in mechanical property and wider in application prospect.
一种利用煤矸石制备块状气凝胶的方法，包括以下步骤：首先将煤矸石粉碎后煅烧活化，酸浸后过滤得到富铝溶液和酸浸残渣；向富铝溶液中滴入氨水调节PH至3‑4，静置后过滤，向滤液中继续滴加氨水调节PH至4‑6获得氢氧化铝悬浮液，将悬浮液在水热条件下生成勃姆石纤维，将勃姆石纤维洗净制成溶胶备用；将酸浸残渣溶于NaOH溶液，滴加盐酸调节PH为2‑4制成二氧化硅溶胶；将勃姆石纤维溶胶和二氧化硅溶胶混合搅拌均匀，滴加氨水得到湿凝胶，再将湿凝胶进行疏水改性、溶剂置换、干燥后获得块状气凝胶。该方法工艺简单，成本低，能充分利用煤矸石中的硅铝元素，所制备得到的块状气凝胶结构完整、孔隙率高、力学性质好、应用前景更广。
Method for preparing blocky aerogel from coal gangue
The invention relates to a method for preparing blocky aerogel by using coal gangue. The method comprises the following steps: firstly, crushing the coal gangue, calcining and activating, carrying out acid leaching, and filtering to obtain an aluminum-rich solution and acid leaching residues; dropwise adding ammonia water into the aluminum-rich solution to adjust the pH value to 3-4, standing, filtering, continuously dropwise adding ammonia water into the filtrate to adjust the pH value to 4-6 to obtain an aluminum hydroxide suspension, generating boehmite fibers from the suspension under a hydrothermal condition, and washing the boehmite fibers to prepare sol for later use; dissolving the acid leaching residues in a NaOH solution, and dropwise adding hydrochloric acid to adjust the pH value to 2-4 to prepare silicon dioxide sol; the preparation method comprises the following steps: uniformly mixing and stirring boehmite fiber sol and silicon dioxide sol, dropwise adding ammonia water to obtain wet gel, and carrying out hydrophobic modification, solvent replacement and drying on the wet gel to obtain blocky aerogel. The method is simple in process and low in cost, silicon and aluminum elements in the coal gangue can be fully utilized, and the prepared blocky aerogel is complete in structure, high in porosity, good in mechanical property and wider in application prospect.
一种利用煤矸石制备块状气凝胶的方法，包括以下步骤：首先将煤矸石粉碎后煅烧活化，酸浸后过滤得到富铝溶液和酸浸残渣；向富铝溶液中滴入氨水调节PH至3‑4，静置后过滤，向滤液中继续滴加氨水调节PH至4‑6获得氢氧化铝悬浮液，将悬浮液在水热条件下生成勃姆石纤维，将勃姆石纤维洗净制成溶胶备用；将酸浸残渣溶于NaOH溶液，滴加盐酸调节PH为2‑4制成二氧化硅溶胶；将勃姆石纤维溶胶和二氧化硅溶胶混合搅拌均匀，滴加氨水得到湿凝胶，再将湿凝胶进行疏水改性、溶剂置换、干燥后获得块状气凝胶。该方法工艺简单，成本低，能充分利用煤矸石中的硅铝元素，所制备得到的块状气凝胶结构完整、孔隙率高、力学性质好、应用前景更广。
Method for preparing blocky aerogel from coal gangue
一种利用煤矸石制备块状气凝胶的方法
QI XUYAO (Autor:in) / WANG JUNRU (Autor:in) / WANG TAO (Autor:in) / WEI HONGYANG (Autor:in) / XIN HAIHUI (Autor:in) / LIANG ZHONGQIU (Autor:in)
23.06.2023
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
/
B01J
Chemische oder physikalische Verfahren, z.B. Katalyse oder Kolloidchemie
,
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY
/
C01B
NON-METALLIC ELEMENTS
,
Nichtmetallische Elemente
/
C01F
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
,
Verbindungen der Metalle Beryllium, Magnesium, Aluminium, Calcium, Strontium, Barium, Radium, Thorium oder der Seltenen Erden
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