Abstract
For flotation enrichment of coals, spent engine oils modified with ozone were used. Preliminary ozonation contributes to the increase in the share of low-boiling components in the compositions of spent oils, also it reduces the viscosity of reagents and improves their flotation properties when coals are enriched. By flotation of coal, using ozonized spent oils, the yield of concentrate significantly increases, ash content is reduced, mineralization of waste flotation is increased, and as a result, the selectivity of the process is increased as well.
Highlights
The high ash content of ordinary energy coals significantly reduces the caloric content of fuel, increases the cost of energy produced, and causes difficulties in the operation of boiler equipment
The spent oils have been tested for flotation of coals of different grades, different stages of metamorphism and petrographic composition, which can potentially be used as energy coals (Table 1)
The success of flotation largely depends on the molecular structure of coals and the presence of functional oxygen-containing groups on the surface of coal particles [4]
Summary
The high ash content of ordinary energy coals significantly reduces the caloric content of fuel, increases the cost of energy produced, and causes difficulties in the operation of boiler equipment. The development of highly mechanized methods of production entails the formation of large quantities of fine coal with particle size < 0.1 mm. The only effective way of enriching the thin sludge is froth flotation, which is based on the difference of physicochemical properties (wettability) in the surface and in the particles of coal and rock. To improve flotation properties of coal particles, surfactants is flotation reagents are used, which are divided into collectors and blowing agents. Petrochemical products and wastes are mainly used in the flotation enrichment of coal. Heteropolar reagents are employed as frothing agents, for example, waste of recycling technical alcohols [1]. For the solution of ecological problems, (as flotation reagents) it is offered to use the spent motor oils which are formed in huge quantities, including operation of motor transport of the mining enterprises
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