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Indirect zinc oxide 99.5%
1>Description
The direct process starts with diverse contaminated zinc composites, such as zinc ores or smelter by-products. The zinc precursors are reduced (carbothermal reduction) by heating with a source of carbon such as anthracite to produce zinc vapor, which is then oxidized as in the indirect process. Because of the lower purity of the source material, the final product is also of lower quality in the direct process as compared to the indirect one.
2>Quality Standrad
| Items | Indicators |
| 1.Active elements (by ZnO dry basis)% ≥ | 99.5 |
| 2.PbO≤ | 0.12 |
| 3. CuO %≤ | 0.006 |
| 4.Manganese (Mn) ≤ | 0.002 |
| 5.Hcl insoluble matter %≤ | 0.03 |
| 6.Water Soluble Matter%≤ | 0.4 |
| 7.105 °C Volatile content%≤ | 0.4 |
| 8.Oil absorption(g/100g): | -- |
| 9.Fineness (residue on 45µm test sieve) ≤ | 0.28 |
3>The color
4>Package
5>Prodction equipment
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indirect zinc oxide 99.5%