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Most processes in coal extraction (hydraulic fracturing, plugging of cracks, irrigation of the exposed mass with deactivating liquid) and initial processing (enrichment) depend on the wetting properties of the coal’s external surface. Atmospheric oxidation changes the composition of the surface...
The use of poorly caking SS coal as a reducing agent in electrofurnace production of ferrosilicon is considered. The characteristics of coke nits, SS coal, and wood chips are compared. SS coal offers some advantages over coke as a reducing agent: lower ash content (Ad = 4.6, as against 11.2%);...
The increase in methane pressure in a sealed thermobaric flask containing gas-bearing coal is investigated in laboratory experiments. An analogous process in a sealed cylindrical borehole drilled in a coal bed through a rock plug is analyzed. This behavior is mathematically described. It is the...
Reactions in heterogeneous mixtures between components in flotation are analyzed. Two models are employed: one describes reactions at the surface of the coal’s organic mass (the on-water model); the other describes reactions in the water itself (the in-water model). The influence of the water’s...
Heat losses in the blast furnace may be decreased by incorporating a heat-insulating insert in the blast channel during assembly of the air tuyere. That decreases coke consumption. In order to avoid stress in the insert when pressure is applied to the tuyere, it is expedient to introduce the...
The creation of effective aspiration systems for use in tipping systems for railroad cars (rotary car dumpers) is considered. An aspiration system with air-jet barriers is introduced. Dust emissions are localized with at least 90% efficiency. In cyclones, the level of processing is 92.4%.
The recycling of solid industrial waste—coal sludge and petroleum coke breeze—is considered. The advantages and disadvantages of the main processing methods are evaluated. The most promising technique is shaping with binder. The strength of composites consisting of coal dust and coke breeze is...
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