The composition of oily sludge from steel rolling is complex

unevenly distributed and different

and there are no relevant national standards for water oil solid three-phase ratio and composition analysis. Different steel rolling sludge needs different treatment process

so it is very important to know the composition of sludge. It is found that azeotropic distillation is more suitable for simultaneous determination of water oil solid three-phase ratio. In addition

the test methods of oil content and physicochemical properties in the residue of steel rolling oil sludge were also discussed. It was found that gas chromatography can effectively detect the components in the oil. The online pretreatment-gas chromatography test method can further improve the accuracy

and the residue analysis needs to combine multiple test methods.