Study On Firing Lightweight Aggregate Of Electrolytic Manganese Residue

With the rapid development of electrolytic manganese industry in China, there aremore and more electrolytic manganese slag, It has always been a technical problemunsolved how to make use of them as resources to reduce their harmfulness. At present,the main mode of disposaling electrolytic manganese slag is given priority to withenterprise stockpiling landfill, but this way brings about many social and environmentalproblems. Therefore, to seek a scientific and reasonable method for disposalingelectrolytic manganese slag is imminent.In this paper, the electrolytic manganese slag is from the Wanlin company inyouyang,Chongqing. The main oxide composition and heavy metal concentrations inelectrolytic manganese slag were studied and analysed, The results showed that themain chemical components of electrolytic manganese slag and fly ash is similar, thismay provide a scientific basis for burning haydite of electrolytic manganese slag.Theheavy metal content in electrolytic manganese slag and leachate concentrations is verylow, do not belong to the hazardous waste. Considering the requirement of chemicalcomposition of raw material for burning haydite, this paper identified electrolyticmanganese slag, fly ash and sawdust as raw material to burn haydite.The best materials ratio and the burning process parameters of using electrolyticmanganese residue burn haydite is: fly ash content is100%, sawdust adding amount is8%, the preheating temperature is500℃,the sintering temperature is1120℃,theholding time is10min. The performance testing indicators of aggregate fired under bestexperimental parameters shows: the specific surface area is4.25m2/g, the bulk densityis684kg/m3, the apparent density is1503kg/m3, bibulous rate is8.5%, air voids is52%,cylinder pressure strength is4.0MPa, all of the targets meet700grade light aggregateof the GB/T17431-2010standards.The leaching toxicity test results show that heavy metal concentrations below therelated standard concentration limit, this shows that ceramsite has very good curingeffect on the heavy metals after high temperature roasting.With the artificial haydite as light aggregate produce the light aggregate concrete,by adjusting the water cement ratio, sand ratio, dosage of fly ash, can formulate the lightaggregate concrete that satisfies the requirement of CL45intensity grade, dry apparentdensity is1660kg/m3. It can be used in industrial and civil construction, has the very good economic benefits and application prospects.The benefit analysis shows that the use of burning haydite of electrolyticmanganese residue has the good economic benefit, environmental benefit and socialbenefit,it has opened up a new way for electrolytic manganese slag utilization.