normal align=center>中国钽铌精矿质量指标

normal align=center>等级

normal align=center>类型

normal align=center>精矿名称

normal align=center>（NbTa）2O5质量分子（不小于）数%

normal align=center>Ta2O5质量分子（不小于）数%

normal align=center>质量分子（不大于）数%

normal align=center>TiO2

normal align=center>SiO2

normal align=center>WO3

normal align=center>P

normal align=center>一

normal align=center>等

normal align=center>品

normal align=center>一级

normal align=center>二级

normal align=center>三级

normal align=center>钽铌精矿

normal align=center>钽铌精矿

normal align=center>钽铌精矿

normal align=center>65

normal align=center>55

normal align=center>55

normal align=center>40

normal align=center>38

normal align=center>35

normal align=center>5

normal align=center>7

normal align=center>3

normal align=center> 

normal align=center>二

normal align=center>等

normal align=center>品

normal align=center>一级

normal align=center>二级

normal align=center>三级

normal align=center>钽铌精矿

normal align=center>钽铌精矿

normal align=center>钽铌精矿

normal align=center>50

normal align=center>45

normal align=center>45

normal align=center>32

normal align=center>29

normal align=center>26

normal align=center>6

normal align=center>11

normal align=center>3.5

normal align=center> 

normal align=center>三等品

normal align=center> 

normal align=center>钽铌精矿

normal align=center>40

normal align=center>22

normal align=center>7

normal align=center>15

normal align=center>4

normal align=center> 

normal align=center>一等品

normal align=center>二等品

normal align=center> 

normal align=center>褐钇铌钽精矿

normal align=center>褐钇铌钽精矿

normal align=center>35

normal align=center>30

normal align=center> 

normal align=center>4

normal align=center>5

normal align=center>4

normal align=center>6

normal align=center> 

normal align=center>0.5

normal align=center>0.5

normal align=center>注：该标准是1987年修改YB831—75标准而成的