Vol 60, No 11 (2017)

The operational efficiency of the batch-preparation shop is assessed, in terms of the uniformity of batch quality. The importance of batch uniformity in the production of blast-furnace coal of stable quality is confirmed. Analysis of individual stages of coal preparation permits the development of batch-uniformity coefficients that may be used in assessing the ability to produce batch of stable quality. In an industrial experiment, the mixing efficiency of coal concentrates is determined in dosing, crushing, and transportation of the final batch to the coke shop.

The industrial production of blast-furnace coke of improved quality has been organized at Makeevka Coke Plant. The coke produced meets global quality standards.

Means of improving the electrode pitch in processing coal tar obtained by light pyrolysis have been developed on the basis of operational experience at Makeevka Coke Plant.

In order to improve the yield of liquid fraction and phenolics content during lignin pyrolysis, an effective method of lignin pyrolysis through the pretreatment of lignin by an acidic ionic liquid 1-butyl-3- methyl-imidazolium dihydrogen phosphate ([Bmim]H₂PO₄) at low temperature is investigated in this study. It is found that [Bmim]H₂PO₄ pretreatment increases the total yield of liquid products of lignin pyrolysis compared to that of original lignin. The [Bmim]H₂PO₄ pretreatment temperature significantly impacts the behaviors of the lignin pyrolysis. In the temperature range of 50 to 150°C, the yield of the overall liquid product obtained by pyrolysis of the sample pretreated at 50°C is the highest. After pretreatment, the [Bmim]H₂PO₄ can be efficiently recovered, but the structure and stability of the [Bmim]H₂PO₄ have been changed. The FTIR analysis shows that the ionic liquid [Bmim]H₂PO₄ pretreatment can break hydrogen bonds, ether linkages and ester bonds in lignin.