两年多来,部分水泥企业在管磨机中应用氧化铝耐磨陶瓷研磨体获得了显著的节电效果。实践证明,即使粉磨工艺及入磨物料粒径、易磨性与水分不同,磨机细磨仓采用陶瓷研磨体,一般都会实现4~6 k Wh/t节电效果,是降低水泥生产成本有效的技术...两年多来,部分水泥企业在管磨机中应用氧化铝耐磨陶瓷研磨体获得了显著的节电效果。实践证明,即使粉磨工艺及入磨物料粒径、易磨性与水分不同,磨机细磨仓采用陶瓷研磨体,一般都会实现4~6 k Wh/t节电效果,是降低水泥生产成本有效的技术途径之一。但有的企业在应用过程中,只是与金属研磨体进行简单的更换、替代,对陶瓷研磨体没有科学地选择,对粉磨系统尤其是管磨机内部结构没有进行相应的改进与调整,最终未能达到预期的技术经济指标。事实上,水泥企业在选择、应用氧化铝耐磨陶瓷研磨体时,应从抗压碎强度、应用过程中动态条件下的破损率及磨耗等指标,综合考察其技术性能;必须重视预粉磨和分级设备的能力以及水泥管磨机磨内结构,进行必要的前期改造。展开更多
In order to investigate the effect o f some factors on the unconfined compressive strength(UCS)for composite soil stabilizer-stabilized gravel soil(CSSSGS),the orthogonal test is adopted to set up the experimental sch...In order to investigate the effect o f some factors on the unconfined compressive strength(UCS)for composite soil stabilizer-stabilized gravel soil(CSSSGS),the orthogonal test is adopted to set up the experimental scheme.Three levels o f each factor armconsidered to obtain the change laws o f UCS,in which the binder dosages are8%,10%,and12%;the curing times ae7,14and21d;the gradation nae0.3,0.35and0.4;and the degrees of compaction are95%,97%,and99%.The range analysis clearly indicates that the influence degree o f the four factors on UCS is in such an order:dosage,age,gradation,and degree o f compaction.The variance analysis shows that only the composite soil stabilizer dosage can significantly affect UCS.In road construction,the examination o f composite soil stabilizer dosage and base-course maintenance should be given much more attention to obtain satisfactory base-course strength,compared w ith gradation floating and the change of degree o f compaction.展开更多
Physical-chemical properties of phosphorous gypsum, proportion and cemented mechanism of slurry with gypsum as aggregate were studied to remove the harms of gypsum pile, combining with difficult problems of excessive ...Physical-chemical properties of phosphorous gypsum, proportion and cemented mechanism of slurry with gypsum as aggregate were studied to remove the harms of gypsum pile, combining with difficult problems of excessive mined-out gobs, enormous ore body under roadway and low recovery ratio of Yongshaba Mine, Kaiyang Phosphor Mine Group, Guizhou Province, China. An appropriate backfill system and craflwork were designed, using shattering milling method to crush gypsum, double-axles mixing and strong activation mixing way to mix slurry, cemented slurry and mullock backfill alternately process. The results show that gypsum is fit for backfilling afterwards by adding fly ash, though it is not an ideal aggregate for fine granule and coagulate retardation. The suggested dosage （the mass ratio of cement to fly ash to gypsum） is 1：1：6-1：1：8 with mass fraction of solid materials 60%-63%. Slurry is transported in suspend state with non-plastic strength, and then in concretion state after backfilling. The application to mine shows the technology is feasible, and gypsum utilization ratio is up to 100%. Transportation and backfill effect is very good for paste-like slurry and drenching cemented slurry into mullock, and the compressive strength and recovery ratio are 2.0 MPa and 82.6%, respectively, with the maximum subsidence of surface only 1.307 mm. Furthermore, the investment of system is about 7 × 10^6 yuan （RMB）, only 1/10 of that of traditional paste backfill system.展开更多
文摘两年多来,部分水泥企业在管磨机中应用氧化铝耐磨陶瓷研磨体获得了显著的节电效果。实践证明,即使粉磨工艺及入磨物料粒径、易磨性与水分不同,磨机细磨仓采用陶瓷研磨体,一般都会实现4~6 k Wh/t节电效果,是降低水泥生产成本有效的技术途径之一。但有的企业在应用过程中,只是与金属研磨体进行简单的更换、替代,对陶瓷研磨体没有科学地选择,对粉磨系统尤其是管磨机内部结构没有进行相应的改进与调整,最终未能达到预期的技术经济指标。事实上,水泥企业在选择、应用氧化铝耐磨陶瓷研磨体时,应从抗压碎强度、应用过程中动态条件下的破损率及磨耗等指标,综合考察其技术性能;必须重视预粉磨和分级设备的能力以及水泥管磨机磨内结构,进行必要的前期改造。
基金The National Natural Science Foundation of China(No.51108081)
文摘In order to investigate the effect o f some factors on the unconfined compressive strength(UCS)for composite soil stabilizer-stabilized gravel soil(CSSSGS),the orthogonal test is adopted to set up the experimental scheme.Three levels o f each factor armconsidered to obtain the change laws o f UCS,in which the binder dosages are8%,10%,and12%;the curing times ae7,14and21d;the gradation nae0.3,0.35and0.4;and the degrees of compaction are95%,97%,and99%.The range analysis clearly indicates that the influence degree o f the four factors on UCS is in such an order:dosage,age,gradation,and degree o f compaction.The variance analysis shows that only the composite soil stabilizer dosage can significantly affect UCS.In road construction,the examination o f composite soil stabilizer dosage and base-course maintenance should be given much more attention to obtain satisfactory base-course strength,compared w ith gradation floating and the change of degree o f compaction.
基金Project(2006BAB02A03)supported by the National Key Technology Research and Development ProgramProject(08MX16)supported by Mittal Scientific and Technological Innovation Projects of Central South University during 2008
文摘Physical-chemical properties of phosphorous gypsum, proportion and cemented mechanism of slurry with gypsum as aggregate were studied to remove the harms of gypsum pile, combining with difficult problems of excessive mined-out gobs, enormous ore body under roadway and low recovery ratio of Yongshaba Mine, Kaiyang Phosphor Mine Group, Guizhou Province, China. An appropriate backfill system and craflwork were designed, using shattering milling method to crush gypsum, double-axles mixing and strong activation mixing way to mix slurry, cemented slurry and mullock backfill alternately process. The results show that gypsum is fit for backfilling afterwards by adding fly ash, though it is not an ideal aggregate for fine granule and coagulate retardation. The suggested dosage （the mass ratio of cement to fly ash to gypsum） is 1：1：6-1：1：8 with mass fraction of solid materials 60%-63%. Slurry is transported in suspend state with non-plastic strength, and then in concretion state after backfilling. The application to mine shows the technology is feasible, and gypsum utilization ratio is up to 100%. Transportation and backfill effect is very good for paste-like slurry and drenching cemented slurry into mullock, and the compressive strength and recovery ratio are 2.0 MPa and 82.6%, respectively, with the maximum subsidence of surface only 1.307 mm. Furthermore, the investment of system is about 7 × 10^6 yuan （RMB）, only 1/10 of that of traditional paste backfill system.
