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控制指标
items

单位

units

等级a

grade a

等级b

grade b

外观

翠绿色颗粒状晶体、颜色均匀、无结块、无杂物 

ni

%

≥22. 0

co

%

≤0.0010

≤0.0020

cu

%

≤0.0010

≤0.0020

fe

%

≤0.0010

≤0.0020

mg

%

≤0.0010

≤0.0020

pb

%

≤0.0020

≤0.0020

zn

%

≤0.0010

≤0.0010

cd

%

≤0.0010

≤0.0010

mn

%

≤0.0010

≤0.0010

ca

%

≤0.0010

≤0.0020

na

%

≤0.0020

≤0.0050

cr

%

≤0.0010

≤0.0010

cl-

%

≤0.0010

≤0.0030

si

%

≤0.0010

≤0.0020

水不溶物water-insoluble

%

≤0.0100

≤0.0200

f-

%

≤0.0010

≤0.0010

油份oil

%

≤0.0010

≤0.0015

磁性异物

magnetic metal impurities

ppb

≤100