| grade | ω(SiO 2 )% | ω(MgO)% | ω(CaO)% | ω(Fe 2 O 3 )% | BaiDu |
| Boundary grade | ≥27 | ≥26 | Unlimited | ≤3 | ≥50 |
| Industrial grade | ≥36 | ≥27 | Unlimited | ≤2 | ≥60 |
| Note 1: Only applicable to talc- associated minerals: A: No presence of magnesium-containing silicate minerals, quartz content less than 3%; B: the total amount of the magnesium-containing silicate mineral plus quartz is less than 8%, wherein the quartz content is less than 2%; C: The total amount of magnesium-containing silicate minerals is less than 10%, and does not contain quartz dolomite-talc-type, magnesite -talc-type ore. For industrial indicators of serpentine-talc-type, chlorite-talc-type, tremolite -talc-type and more complex mixed-type ores containing more than 10% magnesium silicate minerals, it is necessary to Mineral composition, content and product application direction are specifically agreed with the survey investors. | |||||
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