In previous reports [1-5] we examined the reasons for the declining quality of coke in Russia and recommended ways to turn around this situation. We showed that for maximum coke strength, the coal blend should have the following characteristics: V~d 25 percent, y >= 15 mm, R_o > 1.15, and Vt > 60 percent. This optimum blend should consist of three groups of coals: caking GZh + Zh, coking K + KO + OS, and lean KS + KSN. In addition, the reflectogram of this coal blend should have no breaks in continuity. Blend quality depends on the origin of the coals and the properties of the individual blend components. For example, the optimum blend of Kuznetsk Basin coals is, percent: 40-45 GZh + Zh, 35-40 K + KO + OS, and 15-20 KS + KSN. The main reason for declining coke strength is that blends do not have the optimum amount of coking coals and thus do not have the optimum values for V~d and R_o. The shortage of coking coals in blends is 16-17 percent. The only solution to the quality problem is to eliminate the shortage of coking coals. There are two ways to do this: developing more mining and cleaning capacity in Russia or importing more coal.
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机译：在以前的报告[1-5]中，我们研究了俄罗斯焦炭质量下降的原因，并提出了解决这种情况的建议方法。我们表明，要获得最大的焦炭强度，混合煤应具有以下特征：V〜d为25％，y> = 15 mm，R_o> 1.15，Vt> 60％。最佳混合应包括三类煤：结焦GZh + Zh，结焦K + KO + OS和稀薄KS + KSN。此外，这种混煤的反射图应连续性不中断。混合质量取决于煤的来源和各个混合成分的特性。例如，库兹涅茨克盆地煤的最佳混合比例为：40-45 GZh + Zh，35-40 K + KO + OS和15-20 KS + KSN。焦炭强度下降的主要原因是，共混物的焦炭含量不理想，因此V_d和R_o的最优值也不高。共混物中焦煤的短缺为16-17％。解决质量问题的唯一方法是消除焦煤短缺。有两种方法可以做到这一点：在俄罗斯提高采矿和清洁能力，或进口更多煤炭。
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