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Copper slag flotation tailings were taken as raw materials, and carboxymethylcellulose (CMC), bentonite, sodium silicate alone or the mixture were taken as binders to prepare copper slag pellet for reducing dust and flue gas generated during utilization of copper slag tailings. The effect of binder on balling was explored in terms of the drop numbers, compressive strength and cracking temperature of green ball, and microscopic morphology, adsorption characteristics and surface potential changes were also analyzed by scanning electron microscopy, infrared spectroscopy and Zeta potential detection. Results show that all three binders can be useful in agglomeration of copper slag tailings. When used alone, CMC, bentonite and sodium silicate are required to be added at an amount more than 0.20%, 2.0% and 2.5%, respectively. In case of CMC used in combination with bentonite or sodium silicate, bentonite or sodium silicate should be added at an amount of more than 2.0% and more than 2.5%, respectively, with the addition of CMC is at an amount of 0.1%；while with the addition of CMC at an amount of 0.15%, the addition of bentonite or sodium silicate should be more than 1.5% and more than 2.0%, respectively. With the addition of binder, the prepared pellet has more compacted structure and stronger spatial structure. It is found that copper slag tailings particles have a lower value of zeta potential, and an improved hydrophilicity, which can promote interparticle adsorption, and thus improves pellet quality.
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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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