Tin Concentrate Quality Standard

category
grade
Tin (ωB)
not less than%
Impurities (ωB) not more than %
S
P
Bi
Zn
Sb
Fe
one
class
First class product
65
0.4
0.3
0.10
0.4
0.2
5
Secondary products
60
0.5
0.4
0.10
0.5
0.3
7
Third grade
55
0.6
0.5
0.15
0.6
0.4
9
Fourth grade
50
0.8
0.6
0.15
0.7
0.4
12
Five items
45
1.0
0.7
0.20
0.8
0.5
15
Six products
40
1.2
0.8
0.20
0.9
0.6
16
Seven products
35
1.5
1.0
0.30
1.0
0.7
17
Eight products
30
1.5
1.0
0.30
1.0
0.8
18
two
class
First class product
65
1.0
0.4
0.40
0.8
0.4
Secondary products
60
1.5
0.5
0.50
0.9
0.5
7
Third grade
55
2.0
1.0
0.60
1.0
0.6
9
Fourth grade
50
2.5
1.5
0.80
1.2
0.7
12
Five items
45
3.0
2.0
1.0
1.4
0.8
15
Six products
40
3.5
2.5
1.2
1.6
0.9
16
Seven products
35
4.0
3.5
1.4
1.8
1.0
17
Eight products
30
5.0
4.0
1.5
2.0
1.2
18
Note 1: One is the direct-into-pot tin concentrate product, and the second is the tin concentrate product that needs to be processed before smelting.
Note 2: Lead and tungsten in tin concentrates are valuable elements and analysis data should be submitted.
Note 3: Self-produced tin concentrate products can be used to customize corporate standards.

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