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This study gives a comparison between two different industrial units that utilized thermal treatment principles to purify raw sulphur from accompanied bituminous impurities. Different designs and processing approaches were adopted in each unit.

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Oxidation by air blowing for different periods of time was used to modify the physical properties of asphalt. The effect of this treatment on the compatibility of asphalt with sulfur was studied using microscopic examination of more than oneyear aged samples. Improved compatibility of asphalt-sulfur blends was noticed with sulfur percentages of up to 15% by weight.