| ≥1 piece |
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1)Strict quality contral and best price.
2)be exported to more than 50 countries.
3) On time service
4)A high degree of cred
Smithsonite , or zinc spar , is zinc carbonate ZnCO 3 , a mineral ore of zinc. Historically, smithsonite was identified with hemimorphite before it was realised that they were two distinct minerals.The two minerals are very similar in appearance and the term calamine has been used for both, leading to some confusion. The distinct mineral Smithsonite was first described in 1832 and named for British chemist and mineralogist, James Smithson (1754-1829), whose estate financed the Smithsonian Institution
Zinc carbonate is used as an astringent and excipient in shampoo. It is also used as a fireproofing filler for rubber and plastics, as a feed additive, as a pigment, in cosmetics and lotions, and in the manufacturing of porcelain, pottery, and rubber
Specifications:
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Item |
Index |
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Excellent product |
First grade product |
Qualified product |
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|
Main content(zinc)(dry basis), % ≥ |
57.5 |
57.0 |
56.5 |
|
Fire content % |
25.0-28.0 |
25.0-30.0 |
25.0-32.0 |
|
Heavy metal( Pb )content, % ≤ |
0.04 |
0.05 |
0.05 |
|
Moisture, % ≤ |
2.5 |
3.5 |
5.0 |
|
Sulfate(SO4 )content, % ≤ |
0.60 |
0.80 |
|
|
Fineness(passing 75um screen), % ≥ |
95.0 |
94.0 |
93.0 |
|
Cadmium(Cd)content, % ≤ |
0.10 |
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Packing:Packed with inner polyethylene film bag and outer plastic weaving bag. Net weight per bag is 25kg.