normal align=center>耐火粘土一般质量要求

normal align=center>矿石类型

normal align=center>矿石品级

normal align=center>主要化学成分质量分子数%

normal align=center>烧失量%

normal align=center>耐火度℃

normal align=center>可塑性

normal align=center>指标

normal align=center>备注

normal align=center>Al2O3

normal align=center>Fe2O3

normal align=center>CaO

normal align=center>高铝粘土

normal align=center>特级

normal align=center>≥85

normal align=center>≤2.0

normal align=center>≤0.6

normal align=center>≤15

normal align=center>≥1770

normal align=center> 

normal align=center>化学成分以熟料计

normal align=center>Ⅰ级

normal align=center>≥80

normal align=center>≤3.0

normal align=center>≤0.6

normal align=center>≤15

normal align=center>≥1770

normal align=center>Ⅱ级

normal align=center>甲

normal align=center>≥70

normal align=center>≤3.0

normal align=center>≤0.8

normal align=center>≤15

normal align=center>≥1770

normal align=center>乙

normal align=center>≥60

normal align=center>≤3.0

normal align=center>≤0.8

normal align=center>≤15

normal align=center>≥1770

normal align=center>Ⅲ级

normal align=center>≥50

normal align=center>≤2.5

normal align=center>≤0.8

normal align=center>≤15

normal align=center>≥1770

normal align=center>硬质粘土

normal align=center>特级

normal align=center>≥44

normal align=center>≤1.2

normal align=center> 

normal align=center>≤15

normal align=center>≥1750

normal align=center> 

normal align=center>Ⅰ级

normal align=center>≥40

normal align=center>≤2.5

normal align=center> 

normal align=center>≤15

normal align=center>≥1730

normal align=center>Ⅱ级

normal align=center>≥35

normal align=center>≤3.0

normal align=center> 

normal align=center>≤15

normal align=center>≥1670

normal align=center>Ⅲ级

normal align=center>≥30

normal align=center>≤3.5

normal align=center> 

normal align=center>≤15

normal align=center>≥1630

normal align=center>半软质

normal align=center>粘土

normal align=center>Ⅰ级

normal align=center>≥35

normal align=center>≤2.0

normal align=center> 

normal align=center>≤16

normal align=center>≥1690

normal align=center>1～2.5

normal align=center>化学成分以生料计

normal align=center>Ⅱ级

normal align=center>≥30

normal align=center>≤2.5

normal align=center> 

normal align=center>≤16

normal align=center>≥1670

normal align=center>Ⅲ级

normal align=center>≥25

normal align=center>≤3.5

normal align=center> 

normal align=center>≤16

normal align=center>≥1630

normal align=center>软质粘土

normal align=center>Ⅰ级

normal align=center>≥30

normal align=center>≤2.0

normal align=center> 

normal align=center>≤18

normal align=center>≥1670

normal align=center>≤2.5

normal align=center>Ⅱ级

normal align=center>≥26

normal align=center>≤2.5

normal align=center> 

normal align=center>≤18

normal align=center>≥1610

normal align=center>Ⅲ级

normal align=center>≥22

normal align=center>≤3.5

normal align=center> 

normal align=center>≤18

normal align=center>≥1580

normal align=center>开采技术条件

矿层最小可采厚度：地下开采0.8 ～l m；露天开采0.5 ～0.8 m；夹石最小剔除厚度不小于0.5 ～0.8 m；剥采比≤15 m3／m3。