Use of Coal to DRY Rubber
As a first step to the utilization of raw coal as an alternative fuel for drying crumb rubber, a research was conducted to study the effect of SO2 gas on the drying process and rubber quality.
Effect of Sulfur Dioxide
The result showed that drying at air velocity of 3 m/second, temperature range of 90-120oC, and SO2 concentration in drying air up to 0.1% v/v did not influence the drying characteristics. By using the mixture of air + 1% SO2, the drying time became shorter by about 20-30 minutes. SO2 at a concentration of 0.1% in drying air functioned well as an antioxidant, i.e., at 90oC of drying temperature. The Wallace plasticity of rubber after drying (Pa) reached 35, and the Plasticity Retention Index (PRI) was 92,1 higher than when drying air without SO2
(Pa = 32, PRI =82,1) was used. The result of the study gave significant indication that raw coal could be used as fuel for drying crumb rubber.
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