Coke and Chemistry最新文献

On the basis of shale coke and liquid glass, a porous filler (heat insulation) with thermal conductivity no more than 0.25 W/m °C may be produced. M350 filler is made by adding 70% shale coke to the liquid glass; that composition is optimal. Research shows that, for a sample of optimal composition, the porosity is less evident on the exterior than in the interior. Observations reveal that the internal structure of the sample consists mainly of closed pores, which result in stronger components than open pores.

Observations of a delegation of VUKhIN specialists regarding China’s coke plants are noted. The processes and equipment employed are described, and some aspects of coke plant operation are considered.

The properties of deposits in equipment within the machine department (the gas injection machine) and the pipeline delivering coke oven gas are studied, and the process by which they are formed is considered. As an example, attention focuses on the shop for capture and processing of coking products at Magnitogorsk Iron and Steel Works (PAO MMK), which uses various technologies for the cooling and cleaning of coke oven gas.

A method is proposed for assessing the heat of methane desorption from coal on the basis of the temperature change in desorptional induction. The value obtained for the heat of methane desorption is 95 kJ/mol, which is 3–4 times the result obtained by calorimetry. That most likely signifies breakdown of the coal–gas solid solution. The temperature rise in the coal seams into which carbon dioxide is pumped for storage is predicted. A method is proposed for laboratory and shaft experiments on the thermodynamics of desorptional induction.

Improvement in the efficiency of sludge flotation and processing in coal enrichment by appropriate selection of flocculants and modifiers is considered. Zh coal fines (with a high content of small classes) from the Chertinsk mine (Kuznetsk Basin) enriched at Belovskaya enrichment facility are investigated, with 19.5% ash content. The flocculants employed are acrylamide copolymers: Magnаfloc 380 (М-380), Magnаfloc 10 (М-10), Magnаfloc 525 (М-525), and Magnаfloc 345 (М-345). Their performance is compared with that of widely used flocculants (VPK and KSP polyelectrolytes and Technofloc-TL 1597). Neonol (oxyethylated nonylphenol), which is an effective modifier, is also employed; it consists of a mixture of isomers. The action of flocculants and the subsequent modifier on the coal fines is analyzed on the basis of theoretical and experimental data. Sedimentation analysis shows that anionic Magnаfloc М-10 is the most effective flocculant for positively charged coal dispersions. The flotation efficiency is improved for coal fines treated with Magnаfloc М-10 and then Neonol modifier. Quantum chemical modeling by means of HyperChem software establishes the interaction of Neonol with the polar centers of model compounds in the coal’s organic mass (forming hydrogen bonds) and with the polar centers of Magnаfloc М-10. Analysis of the coal’s flotation properties confirms that the coal surface becomes hydrophobic after flocculation of the coal fines and subsequent treatment with Neonol modifier. After flocculation of the coal sludge and subsequent treatment with Neonol, the concentrate yield in flotation is increased by 2.4%, while its ash content is decreased by 0.3%.