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Outline
A copper-sulfur ore processing plant in Guangdong employed a "high-alkali copper extraction-weak-acid sulfur extraction" process and reagent system. To address the problems of high on-site alkali consumption, low flotation efficiency, and elevated safety and environmental risks, experimental studies were conducted on ore properties and mineral processing techniques. This led to the identification of a "low-alkali, acid-free" process scheme and based on the ore characteristics, the development of a tailored, low-alkali reagent system for the green and efficient separation of copper-sulfur. Results indicate that a scheme employing B18 to collect copper minerals and CD-S2 to partially replace lime for sulfur suppression, with copper sulfate replacing sulfuric acid for activation, and butyl xanthate for sulfur floation, is effective. The closed-circuit test achieved a copper concentrate with Cu grade of 20.84% and Cu recovery of 88.11%, along with a comprehensive sulfur concentrate with S grade of 46.12% and S recovery of 94.68%. Compared to the "high-alkali-weak-acid" process, the "low-alkali-acid-free" process can increase the copper grade and recovery in copper concentrate by 2.59 percentage points and 1.94 percentage points respectively, while maintaining comparable overall sulfur concentrate indicators. The pH of the roughing pulp in closed-circuit tests decreases from 11 to 8.5, achieving clean and efficient separation and recovery of copper and sulfur in a low-alkali-acid-free environment.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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