Coal is a fossil fuel that can be used as an alternative fuel source fuel oil and natural gas that had been reduced. Coal reserves in Indonesia, especially in Sulawesi potent enough, but until now have not been utilized as fuel in view of the content of sulfur is relatively high which may cause damage to the appliance combustion, and can cause environmental pollution, except first performed desulfurization process prior to combustion (precombustion ). This study aims to reduce the sulfur content of pyrite in the coal so that it meets the criteria to be used as one of the fuel industry. Specifically, this research aims to study the mechanisms and kinetics of coal using an oxidizing ferry depiritsasi sulfate, in an effort to minimize the sulfur content of the coal, the Coal Desulfurization Using research conducted oxidizing iron (III) Processed Waste Iron. Research desulfurization of coal origin Mallawa (Sulawesi) was performed in a laboratory scale reactor (four-neck flask) with a semi- batch system, equipped with a compressor, flowmeter, a thermometer and stirrer. Characterization, proximate and ultimate analysis of coal is done following the ASTM standard procedure. Total sulfur analysis was conducted using esckha combined with UV spectrophotometer, while the calorific value of coal was measured by a bomb calorimeter. From the results obtained value per count of the reaction order n = 1,771. This value was not unanimous but a fraction indicating that the reaction reagent depiritisasi with iron (III) sulfate is a complex reaction that consists of several stages of reaction. The results of this study the kinetics equation obtained by reacting coal depiritisasi iron (III) sulphate at a temperature of 90 ° C, stirring speed of 930 rpm as follows: - rS = 6,741.10-2.CS (1,771)