Home / Standards / GB/T 41042-2021 GB/T 41042-2021 Active Guidance for utilization and classification of content of valuable elements in coal 煤中有价元素含量分级及应用导则 Standard Type GBT ICS 73.040 CCS D21 Status 现行 Issue Date 2021-12-31 Implementation 2022-07-01 Responsible Dept 中国煤炭工业协会 Drafting Unit N/A