the effect of binder pitch quinoline insolubles content - Coke Oven ...

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BINDER PITCH QI CONTENT – ALUMINIUM ANODE Increasing the amount of normal QI in pitch has been found to have the following effects on anode properties: Baked density – increase [6,16,17,23], decrease [14], or not strongly influenced [20,24] Strength - increase [2,6,8,13,16, 17,21,23,25], or little change [14,19] Electrical resistivity – increase [2,8,17], decrease [6], or little change [19,20,21] Air Permeability – decrease [6] or little change [19] Coefficient of thermal expansion – increase [22] Reactivity – increase [2,8,15,17,25,26], little change [19,21,23,27] Sodium sensitivity – decreases [25] Anode consumption – little change [20,21,23,27] While there is a lot of variation in these reported anode property results, it is worth noting that in virtually all of the studies reviewed (covering normal QI levels from 1 – 20%) the measured anode properties were in the typical ranges for each test. Several studies showed clear evidence or included the comment that low (e.g.
COKE OVEN MANAGERS’ YEAR BOOK Table 2 – Physical Properties of Pitches in Anode Study Property Softening Point, °C Quinoline Insolubles, wt.% Toluene Insolubles, wt.% Beta Resins, wt.% Coking Value, wt.% Density, g/cc 3.8% 5.6% 10.1% 16.1% 20.0% 24.3% QI QI QI QI QI QI 112 110 112 111 107 107 3.8 5.6 10.1 16.1 20.0 24.3 20.3 22.1 25.6 29.5 33.5 37.4 16.4 16.5 15.5 13.1 13.5 13.1 53.8 51.9 56.2 57.5 59.7 60.5 1.30 1.25 1.33 1.34 1.35 1.36 Sized coke received from a United States smelter was mixed using the following standard anode coke formation: Coarse 31.5 % Intermediate 14.6 % Fines 37.0 % Butts 16.9 % A series of cylindrical laboratory size anodes (10.2 cm in diameter and 15.2 cm in height) was prepared using each of the six pitches. The details of the anode mixing, molding, and baking protocol are given in Table 3. 135
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