Vol 59, No 11 (2016)

On the basis of laboratory data for production batch employed at AO Evraz NTMK and AO Evraz ZSMK, including batch that contains Ulug-Khem coal, a coking characteristic is proposed. This characteristic permits relatively precise prediction of CSR and CRI. Its relation with the quality of coke produced by the classical method and from rammed coal batch is analyzed.

The optimization of heating by recirculation of the combustion products is considered. Arguments supporting the adoption of this approach in the heating channels of Russian coke batteries are presented. Methods of ensuring uniform heating of the coke cake over its height in non-Russian coke batteries are also described. Recirculation of the combustion products does not ensure the required heating of the coke cake over its height in Russian coke batteries. Accordingly, lengthening of the combustion flame in the heating channels is required.

The products of electrochemical destructive oxidation of bituminous lignite tar are considered for use in the enrichment of high-ash coal slurry. In particular, their flotational activity in enrichment is assessed. The low-molecular compounds formed in oxidation have surfactant properties. That facilitates the separation of the combustible coal mass from the mineral component.

The thermochemical processing of high-sulfur shale from the Mishor Rotem deposit (Israel) is studied in terms of the material balance, in a Fisher retort and a larger-scale laboratory system. The properties of the products (tar, char, and gas) are determined. The shale tar has a high sulfur content, on account of the presence of a wide range of thiophene derivatives. In the fractions of semicoking tar from Mishor Rotem shale that boil at temperatures up to 250°C, 236 compounds are quantitatively identified. The content of thiophene and its homologs with the substituents C₁–C₅ and of benzothiophene with alkyl substituents C₁–C₃ is determined.

The removal of carbon from wastewater by means of carbon adsorbents is experimentally studied. The kinetics of phenol adsorption from aqueous solutions simulating its content in industrial wastewater at mining enterprises and coke plants is investigated. The kinetic curves of phenol adsorption on AG-OV-1 and ABG active carbon differ from the classic form. The time to attain equilibrium in the phenol–water–sorbent system varies in the range 30–60 min. The adsorption process is found to be limited by external diffusion. The external diffusion coefficients are calculated. On the basis of the external mass-transfer coefficients, we may expect high phenol extraction from wastewater at moderate filtration rates through the dense immobile sorbent layer.