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轴承滚动体研磨过程中使用一些磨液以起到润滑和冷却作用。磨液为水、油酸以及配加的少量氢氧化钠,因此,钢泥废料表面会吸附上含有油酸和油酸钠的研磨油污,该油污对钢泥废料的后续还原处理生产还原钢粉产生不利影响,必须予以去除。采取400℃蒸馏挥发脱附法对轴承滚动体研磨钢泥废料表面油污的去除进行了研究。通过热重的方式研究了钢泥表面油污挥发脱附的失重情况,得出400℃钢泥表面油污挥发脱附大约需要17.1min,油污的挥发脱附满足二级动力学模型;通过油污蒸馏挥发脱附机理研究,明确油污脱附既要满足热力学条件,同时也受油污蒸汽溢出动力学影响;400℃氩气气氛下油污挥发后碳质量分数由2.89%降至0.76%,钢泥表面油污去除效果较好。
Some grinding fluid is used during grinding of the bearing rolling elements to lubricate and cool it. The grinding fluid is water, oleic acid and a small amount of sodium hydroxide added thereto. Therefore, the surface of the steel sludge is adsorbed with the grinding oil containing oleic acid and sodium oleate, and the oil sludge subsequently reduces the steel sludge to produce reduced steel powder Have an adverse effect and must be removed. The removal of oily dirt on the surface of the steel rolling mill was carried out by using 400 ℃ distillation and volatilization desorption method. The gravitational desorption of oil sludge on the surface of the sludge was studied by thermogravimetric method. It was found that the volatilization and desorption of oil on the sludge surface at 400 ℃ took 17.1min. The volatilization and desorption of oil met the second-order kinetics model. The study of desorption mechanism shows that it is necessary to satisfy the thermodynamic conditions as well as the kinetics of oil spillover. The carbon content of oil volatilization decreases from 2.89% to 0.76% in argon gas at 400 ℃, The effect is better.