电解锰渣基活性胶凝材料的制备与性能研究

Study on Preparation and Properties of Electrolytic Manganese Residue Based Gelling Material

为促进电解锰渣的无害化、减量化、资源化处置,提高电解锰渣在水泥等建材行业的大宗消纳水平,本文针对国内某厂的电解锰渣,探索了脱氨脱硫提铁工艺的系列参数,采用电解锰渣原渣、脱硫锰渣和还原提铁锰渣制备活性胶凝材料,并对比活性指数。结果表明,电解锰渣的氨含量和硫含量均随焙烧温度的升高而降低,当温度为400℃时,渣中残氨含量为0.09%,脱氨率大于90%,在温度600℃条件下保温焙烧10 min,脱氨率大于98%;在温度1 300℃条件下焙烧,电解锰渣含硫量可降至1%以下,脱硫率大于96%;该脱硫锰渣经配入辅剂后,在温度1 500℃条件下保温5 min,渣中Fe含量可降至1%以下,达到较为理想的提铁效果。电解锰活性较差,无法通过物理和化学激发的方法达到S75级矿渣粉标准;脱硫锰渣经提高比表面积或配加激发剂混磨后可满足S75矿渣粉的要求;还原提铁锰渣具备良好的活性,粉磨后可直接用于水泥混合材等建材产品,掺入量可达50%,有利于电解锰渣的大宗消纳。

In order to promote the large-scale consumption of electrolytic manganese residue(EMR)in cement and other building materials industry,which is conducive to the harmless,reduction and resource disposal of EMR,the parameters of deamination,desulphurization and iron extraction of EMR were explored,and a series of EMR based active gelling materials were prepared.The results show that the ammonia content and sulfur content of EMR decrease with the increase of roasting temperature.When the temperature is 400℃,the residual ammonia content in the slag is 0.09%,and the deamination rate is greater than 90%.When the roasting is held at 600℃for 10 min,the deamination rate is greater than 98%.When taking higher temperature deamination,better deamination effect can be achieved in a shorter holding time.When held at 1300℃for different holding time,the sulfur content of electrolytic manganese slag can be reduced to less than 1%,and the desulfurization rate is greater than 96%.The content of Fe in the desulphurized EMR with added auxiliary materials can be reduced to about 1%after holding at 1500℃for 5 min,which can be regarded as an ideal effect of iron extraction.The gelling activity of undisturbed EMR powder is low and it can t reach the standard of S75 slag powder by physical or chemical excitation method.The desulphurized EMR powder can meet the requirements of S75 slag powder after increasing the specific surface area or mixing with activator.The EMR powder after extracting iron has good gelling activity and can be directly used in building materials such as cement mixture after grinding,and the incorporation amount is as high as 50%,which is conducive to bulk consumption of EMR.