The relation between blending ratio and strength of uncoked and coked briquett was studied.
Binder of 7.15% of briquett was used. As binder, coal tar plus soft pitch (1: 1) was better than soft pitch only.
Suitable ratio of Senseki/Miike precipitated fine coal is 60-80/40-20. When Chikura is used, it must be carbonized previously and blended with Senseki and Miike precipitated fine coal. Strength of uncoked and coked briquetts made of carbonized Chikura, Senseki and Miike precipitated fine coal are 70-80 kg/cm
2 at wide blending range. Yamano powder may be blended with Senseki (40-70%) and Miike precipitated fine coal (20%).
Transition of strength of briquett during carbonization was studied. Briquett binded with tar plus pitch or pulp waste liquor and pressed by the pressure of 200-500kg/cm2 decrease its strength to 20-35kg/cm
2 in 1-5min. after briquett is put in furnace heated at 500°C, and then increase its strength in 20min. and become constant, thereafter.
We think that strength of 20kg/cm
2 is enough to gasification or carbonization.
In this study, “carbonization in hot sand” method was applied. Briquett was carbonized in hot (500°C) Chikura powder in rotary retort, we got a good result.
View full abstract