Technology for Coke Production in Tunnel Kiln from Compacted Coal Powder

Abstract

Coal extraction produces large amounts of wastewater containing coal powders, which could be used to produce coke. In this case, binder materials should be used to allow compression capacity to the mixture. This work aims to study the effect of binder addition in mixtures of coals containing different contents of coal powders to obtain coke. Compositions containing different amounts of coal powders were prepared by varying the nature and the contents of the binders to allow the pressing of powders. Study of the thermal behavior of these compositions was performed. The composition that showed the best results was then homogenized, pressed and heat treated. The final composition showed FSI about 4.5 and compressive strength of 5 MPa, demonstrating high potential for coke production from coal powder.

Permeability of Porous Ceramic Membranes Obtained from Waste of the Coal Extraction Process

“…After, water was added to compositions up to 6 wt%. Compositions were formed in a hydraulic press (Gabbrielli GT0785, Italy; specific pressure of 150 kg/cm²) according to previous work [3]. The thermal behavior of the coal waste was determined in an optical dilatometer (Expert System Solutions MISURA HSM ODHT 1600, Italy; 10 °C.min -1 in air) in order to determine the sintering temperature.…”

“…The thermal behavior of the coal waste was determined in an optical dilatometer (Expert System Solutions MISURA HSM ODHT 1600, Italy; 10 °C.min -1 in air) in order to determine the sintering temperature. Temperature and holding time for degassing the binder was defined from previous works [3,4,5]. Compositions were heat treated in a laboratory kiln (Jung, Brazil).…”

“…This waste shows potential application in novel compositions of coke. Up to 10 wt%, it can be used without significantly changing the physical-chemical characteristics of the coke, as in the obtainment of porous ceramics [3].…”