摘要
复合矿物掺合料多由混合粉磨工艺制得,无法调控各组分粒径,存在过粉磨和欠粉磨问题,导致产品需水量高或活性低。分别粉磨工艺可以实现各组分粒径的分别调控,但设备投资大、改造成本高、对场地空间要求高,未在传统生产企业推广应用。因此本文研究了矿渣、粉煤灰粒度搭配对复合矿物掺合料性能的影响,利用嵩基新材料公司磨机数量多的特点,通过多台球磨串联、分段喂料等工艺分别控制矿粉和粉煤灰粒径,调控各磨机喂料量制备了不同活性指数的复合矿物掺合料。喂料量为37.5 t/h时,该制备技术的电耗和碳排放分别为40.5 kWh/t和48.6 kg/t,复合矿物掺合料7 d活性指数达71.1%,综合效益相对最佳。降低喂料量至28.8 t/h,复合矿物掺合料的7 d活性指数可由40.0 t/h时的68.4%提高至74.8%,但电耗和碳排放较高。
Currently,composite mineral admixtures are mostly obtained through blended grinding processes,and the particle sizes of each component cannot be effectively controlled which causes some issues such as over-grinding or under-grinding,leading to high water demand or low reactivity.The separate grinding process can achieve separate control of particle sizes for each component,but it requires large equipment investment,high retrofitting costs and high space requirements,so it has not been widely applied in traditional production enterprises.This study investigates the effects of slag and fly ash particle size on the performance of composite mineral admixtures.Taking advantage of the large number of mills in Songji New Materials Company,multiple ball mills were used in series with segmented feeding techniques to separately control the particle sizes of slag and fly ash,and blended mineral admixtures with different reactivity indices were prepared by this way.When the feeding rate is 37.5 tons per hour,the energy consumption and carbon emissions of this preparation technique are 40.5 kWh per ton and 48.6 kg per ton respectively.The 7 d reactivity index of the blended mineral admixture reaches 71.1%,indicating optimal comprehensive benefits.When the feeding rate is reduced to 28.8 tons per hour,the 7 d reactivity index of the blended mineral admixture can be increased from 68.4%at 40.0 tons per hour to 74.8%.However,there is a higher energy consumption and carbon emissions associated with this lower feeding rate.
作者
幸泽佳
张同生
郭奕群
杨玉祥
屈松杰
张其林
李茂辉
XING Zejia(School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China)
出处
《水泥》
CAS
2024年第7期1-7,共7页
Cement
基金
国家自然科学基金委优秀青年基金(52122201)
宁夏回族自治区重点研发计划项目(2022BDE02002)。
关键词
复合矿物掺合料
多级球磨
矿渣
粉煤灰
活性指数
综合效益评价
composite mineral admixture
multi-stage ball milling
granulated blast furnace slag
fly ash
activity index
comprehensive benefit evaluation
