The quality of zirconium concentrate varies with resources, and there is no international standard. Therefore, the companies or manufacturers of each producing country have their own standards according to their resource characteristics and user requirements. The national standards for zirconium concentrate in China are shown in the table below.

Table National Standard for Zircon Concentrates in China

level

chemical composition,%

Particle size mm

(Zr, Hf)O 2

Impurity content

TiO 2

P 2 O 5

Fe 2 O 3

Al 2 O 3

SiO 2

Premium product

65.50

0.3

0.20

0.10

0.3

34

-0.4

First grade

65.00

0.5

0.25

0.25

0.8

34

-0.4

Second grade product

65.00

1.0

0.35

0.30

0.8

34

-0.4

Third grade

63.00

2.5

1.50

0.50

1.0

33

-0.4

Fourth grade

60.00

3.5

0.80

0.80

1.2

32

-0.4

Five grade

55.00

8.0

1.50

1.50

1.5

31

-0.4

Timing Cover

Timing Cover,Front Timing Cover,Timing Chain Cover,Timing Belt Cover

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