Sulfuric acid, slag, gypsum, etc.
Sulfuric acid
Sulfuric acid is produced in the copper smelting process using as raw material the sulfur contained in copper concentrate.
It is a colorless, odorless viscous liquid, and multiple products are manufactured for different uses, which range widely from industry to agriculture.
Types and quality standards
| Sulfuric acid content | Residue on ignition | Iron content | |
|---|---|---|---|
| Concentrated sulfuric acid | Nominal sulfuric acid or more | 0.05% or less | 0.03% or less |
| Dilute sulfuric acid | |||
| Oleum (fuming sulfuric acid) | Nominal free sulfur anhydride or more |
Applications
Fertilizer, textile, paper and pulp, titanium oxide, resin, steel
Slag
The Group produces copper slag—iron silicate resulting from the bonding of iron in copper concentrate with silica in the copper smelting process. It is crushed by high-pressure water to form black, glassy granules.
Having a large specific gravity of 3.5 and high hardness (6 Mohs or more), this industrial product has greater grain size stability than natural sand.
| Types, forms, sizes, etc. | Copper slag |
|---|---|
| Standard | Composition: Fe 35 to 45%, SiO2 30 to 40%, Al2O3 3 to 5% |
| Grain size: 0.3 to 5 mm | |
| Applications | Raw material for cement (iron source for clinker), sandblasting material, port applications (caisson filling material, sand compaction material), secondary concrete products, and fine aggregate for ready-mix concrete |
Copper sulfate
The Group produces copper sulfate by refining and crystallizing copper electrolyte in the copper refining process.
It has a wide range of applications from agricultural chemicals to plating and catalysts.
| Forms | Blue crystalline powder |
|---|---|
| Quality standard | CuSO4, 5H2O≧98.5% |
| Main applications | Agricultural chemicals (for disease control), industrial plating, catalysts |
Gypsum
The Group produces gypsum, a white powdered substance, by adding calcium carbonate to sulfur, contained in copper concentrate.
Three types of gypsum are produced depending on the production process.
| Types, forms, sizes, etc. | Sulfuric acid gypsum, flue gas desulfurization gypsum, waste acid treatment process gypsum |
|---|---|
| Applications | Gypsum board, raw material for cement (solidification accelerator) |
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