Coke and Chemistry

Admakin, L.

doi: 10.3103/S1068364X08040017pmid: N/A

The reduction and oxidation of organic matter play a key role in the petrography of coal—in particular, by determining the relative content of vitrinite and fusinite microcomponents. These, in turn, determine the quality and thereby influence the technological characteristics of the coal [1–4]. However, in the petrography of coal, the physicochemical character of oxidation and reduction is not always sufficiently emphasized. In the present work, we briefly consider some aspects of these very complex processes.

Sknar, V.; Miroshnichenko, A.

doi: 10.3103/S1068364X08040029pmid: N/A

The Sapozhnikov-Bazilevich method, on which State Standard GOST 1186-87 is based [1], is preferable to other methods of investigating the clinkering properties of coal, in that it reproduces near-industrial coking conditions in miniature. This method permits study of the most important properties of coal and coal batches, formulation of their likely behavior in coking, and the prediction of coke quality.

Nikitin, N.; Nikitin, I.

doi: 10.3103/S1068364X08040030pmid: N/A

The need to improve coal enrichment stems from the sharp deterioration in the coal being enriched (increasing ash and moisture content, content of small classes, rock content, etc.), which results from the widespread mechanization of mining operations, the development of high-ash deposits, and dust suppression [1].

Kopeliovich, L.

doi: 10.3103/S1068364X08040042pmid: N/A

The reactivity of coke plays an important role in blast-furnace smelting. The reaction of carbon in coke with oxygen generates the heat required for various chemical reactions in the blast furnace. The reaction of carbon in coke with carbon dioxide and water vapor forms carbon monoxide and hydrogen, which reduce the iron and alloying elements from their oxides. As a result of these reactions, the strength of the coke pieces in the blast furnace is reduced, and they break down more as they move in the furnace batch, with consequent decrease in gas permeability of the batch column.

Timirgaleeva, L.; Petukhov, V.; Suleimanov, M.; Cherchintsev, V.; Kutnyi, S.; Korobov, E.

doi: 10.3103/S1068364X08040054pmid: N/A

Coke consumption at blast furnaces is steadily rising as hot-metal production expands. Meeting the hot-metal demand simply by improving the quality of the iron ore and coke is no longer possible. The remaining options are to construct new coke batteries, to reconstruct existing batteries, and to improve the operational stability of coke batteries. High construction costs limit the applicability of the first two approaches. Accordingly, a high priority is to improve operational stability by reducing incidents and accidents and thus reducing furnace downtime.

Bochenin, V.

doi: 10.3103/S1068364X08040066pmid: N/A

Coal concentrate with minimum moisture content is used for coke production in metallurgy. At various enterprises, the moisture content is determined by weighing [1]. However, this method is slow and is undertaken in the laboratory. To reduce the loss of production, accelerated monitoring of the moisture content in industrial conditions is required.

Strakhov, V.; Mikhailenko, A.

doi: 10.3103/S1068364X08040078pmid: N/A

Residual elements in the batch have a considerable influence of the quality of converter steel. Of these, nitrogen is the most difficult to regulate in smelting and represents one of the main obstacles to the production of high-quality steel—in particular, steel for wire rod, springs, and cord [1–3]. High nitrogen content in steel produces strain aging and is associated with lower plasticity of cold-rolled and tempered low-carbon steel sheet. Carbon-bearing materials—carburizers—are used for ladle treatment of such special steels. Such materials must have a low content of nitrogen and sulfur (≤ 0.5%). In addition, their moisture content and yield of volatiles must be as low as possible. They are confined to size class 6-1 mm.

Platonov, O.; Stepanov, E.

doi: 10.3103/S1068364X0804008Xpmid: N/A

Cyclic removal of ammonia from coke-oven gas was proposed in [1]. Subsequent studies described its implementation in shop 2 for trapping coke-oven gas (TS 2) at the coke plant of OAO Magnitogorskii Metallurgicheskii Kombinat (MMK) and subsequent operational experience [2, 3]. In the present brief work, attention focuses on monitoring of the catalyst activity in the ammonia-decomposition furnaces; these catalysts determine the efficiency of denitrification.

doi: 10.3103/S1068364X08040091pmid: N/A