浅谈砂石骨料生产线常用破碎机特性及组合形式

破碎机作为砂石骨料生产线的核心设备,对整条生产线意义重大。本文简述常用破碎机的特性及操作维护,介绍几种常见破碎机组合形式的优缺点及技术经济指标,对砂石骨料生产线破碎系统的选用及日常维护有借鉴意义。     

移动式砂石产线在隧道洞渣处理中的应用研究

为了解决隧道施工中废弃洞渣处理及混凝土砂石料供应问题,本文利用我公司研发的新型移动式破碎系统将隧道洞渣破碎筛分成满足标准要求的砂石骨料;通过理论分析及工地试验验证,确立了符合当地岩石特性的破碎设备选型,研究出了一套控制砂石料质量的工艺流程。实验研究结果表明,新型移动式破碎系统适应性强、可靠性高,生产的砂石骨料符合国家标准及工程使用要求。     

浅谈砂石骨料线破碎设备及组合形式的选择

随着人工砂石骨料在我国的大量使用,人工砂石骨料生产线也越来越多,这里对砂石骨料生产线破碎设备及组合形式的主要特点进行阐述,为以后的选型提供参考.     

陕西某花岗岩机制砂石技术方案设计

针对陕西某花岗岩机制砂石骨料生产线,综合考虑料源特性、产品种类及级配要求等因素,提出"可调节除土流程-多级破碎筛分-全产品整形再筛分-湿式洗砂"的干湿结合技术方案,通过优化设备选型及配置方案,提高了作业效率与产品质量,为绿色低碳砂石骨料生产提供借鉴。     

小型水泥厂石灰石破碎系统的选型

石灰石破碎是水泥生产的第一道工序,许多小型水泥厂由于破碎系统选型不当,排矿粒度过大,严重影响了生料磨生产能力的发挥,致使窑系统经常停火待料。破碎系统(包括喂料设备、破碎机、筛分、收尘及辅助设备)的正确选型和设计是保证稳定生产的关键所在。     

利用石灰石破碎系统扩建骨料生产线的设计探讨

该文通过对水泥生产线破碎后石灰石的理化分析,并结合当地市场对骨料产品的需求和原石灰石破碎系统低运转率的特点,提出了充分利用原石灰石破碎系统产能,只增加振动筛扩建骨料生产线的设计方案,并就骨料产品的质量、石灰石破碎系统工作制度的调整和扩建后对水泥生产线的影响进行了充分探讨。     

浅谈半干法砂石骨料生产线工艺设计

结合已投产运行的半干法砂石骨料生产线,从主要设备选型、工艺流程、设计要点分析、环境保护等几个方面介绍半干法砂石骨料生产线的工艺设计。     

砂石骨料产业转型升级应建立的新模式

<正>砂石骨料的发展历程我国砂石骨料的发展是伴随建筑和基础设施建设技术的发展以及砂石骨料生产设备技术的进步而不断发展的过程。砂石骨料也因天然砂石的减少和禁采而逐渐向机制砂石发展。在砂石骨料的生产中,其核心技术是"破碎和筛分",其生产过程可概括为"精破细筛"。砂石骨料是由早期的江河湖泊人工开采、天然砂石机械开采、机制砂石规模化生产,最终发展成为矿山开采、加工、物料储运高度集成化、自动化、规模化的现代产业。在环保方面,城市建筑废弃混凝土、道路废弃沥青混凝土     

再生粗骨料特性及其对混凝土性能影响研究

为实现当地废弃混凝土的循环再利用,在充分测试再生粗骨料特性的基础上,进一步对其混凝土性能进行了研究。试验表明,通过颚式破碎机破碎后的废弃混凝土,可作为再生粗骨料循环再利用;掺入了一定量的废弃混凝土再生粗骨料制备的再生混凝土可以保证其良好的性能。     

石灰石破碎系统的粉尘综合治理

水泥厂的除尘设备和工艺的合理设计与运行,是保证良好的除尘效果,提高生产效率和避免环境破坏的重要因素。1存在的问题2 x 2500t/d新型干法水泥生产线的石灰石破碎选用一台单段锤式破碎机,石灰石通过卸车坑、板式喂料机喂入破碎机,破碎后由胶带输送机输送至     

混凝土骨料再生设备及工艺研究

先进破碎设备及经济合理的骨料再生工艺是生产和推广再生混凝土、实现建筑资源环境可持续发展和发展绿色混凝土的关键所在.以层压破碎理论为基础,通过对两级破碎设备出口粒径、挤压频率、转子偏心距等技术参数的改进设计和分析研究,提出实现这些参数改进的具体措施.在对国内外现有破碎工艺比较分析的基础上,拟订了废弃混凝土新的破碎工艺(挤压破碎、加热、碾磨、筛分),分析验证了所选参数及工艺安排的合理性.结果表明,改进设计后的破碎设备提高了再生骨料的品质,符合结构混凝土对骨料质量的要求;拟订的工艺经济合理可行,大幅度提高了废弃混凝土骨料的回收率.     

储水型生态混凝土的制备及性能研究

试验以5～10mm或10～15mm石灰岩碎石和废弃红砖为骨料,制备出一种储水型生态混凝土。然后试验研究了废弃红砖用量对混凝土透水性能、保水性能和力学性能的影响。     

Comparison of properties of steel slag and crushed limestone aggregate concretes

Steel slag is produced as a by-product during the oxidation of steel pellets in an electric arc furnace. This by-product that mainly consists of calcium carbonate is broken down to smaller sizes to be used as aggregates in asphalt and concrete. They are particularly useful in areas where good-quality aggregate is scarce. This research study was conducted to evaluate the mechanical properties and durability characteristics of steel slag aggregate concrete in comparison with the crushed limestone stone aggregate concrete. The durability performance of both steel slag and crushed limestone aggregate concretes was evaluated by assessing water permeability, pulse velocity, dimensional stability and reinforcement corrosion. The results indicated that the durability characteristics of steel slag cement concretes were better than those of crushed limestone aggregate concrete. Similarly, some of the physical properties of steel slag aggregate concrete were better than those of crushed limestone aggregate concrete, though the unit weight of the former was more than that of the latter.     

废弃混凝土煅烧水泥的试验研究

我国每年产生的废弃混凝土数量巨大,研究废弃混凝土的再生利用有着重要意义。从建筑物拆除现场采集废弃混凝土样品,将其破碎分离后,选取其中石灰石颗粒作为煅烧水泥熟料的原料。结果表明：所烧熟料中四种矿物X衍射特征峰明显;游离氧化钙较低,符合要求;28天强度达到47．68MPa。     

石粉掺量对轻骨料混凝土性能的影响

采用天然浮石作为粗骨料,以LC40强度等级的轻骨料混凝土为基准,研究石粉掺量对轻骨料混凝土的抗压强度、抗折强度、轴心抗压强度的影响,提出了应力-应变曲线的本构方程,运用扫描电镜分析了石粉掺量对其结构的影响.结果表明:石粉的掺入对轻骨料混凝土性能的改善较为明显,石粉掺量为30%(质量分数)时其力学性能最佳;轻骨料混凝土的本构关系用有理式方程表达更精确.     

The effects of limestone aggregate on concrete properties

The use of limestone in the construction industry has been increasing due to benefits as aggregate. Some of these benefits include good strength, low possibility of alkali-silica reaction and the decrease in drying shrinkage in concrete. This research discusses the consumption and general characteristics of the limestone aggregate in USA and Japan. Then experiments were conducted on mixtures of different proportions of fine limestone and sand at different water/cement (W/C) ratios. The W/C ratios selected were 45%, 55% and 65% with fine limestone replacements of 0%, 30%, 50% and 100%. The water absorption and porosity of fine limestone and sand were measured to find a relation with the water entrapped in the pores of the surface of the rock and the drying shrinkage.The results show the increases in the compressive and flexural strengths and modulus of elasticity when the fine limestone proportion increases in the mixture. The most outstanding results are found on the drying shrinkage, which decreases considerably with the increase in fine limestone proportions.     

废弃灰岩矿地质灾害特征及破坏模式分析——以天津大兴峪北矿区为例

文章依据天津蓟县大兴峪北矿区废弃灰岩矿工程勘查实际工作经验,对石灰岩矿区的滑坡、崩塌地质灾害特征进行了分析总结,为今后废弃石灰岩矿矿区地质灾害勘查及破坏模式分析提供借鉴。     

Influence of clay in limestone fillers for self-compacting cement based composites

High workability together with a good resistance to segregation is needed for cement based composites, specifically fresh self-compacting mortars (SCM); in this prospect, the amount of coarse materials has to be reduced and replaced by fine material. Several limestone fillers are here compared and analysed. These by-products are issued from different industrial sectors, such as the aggregate and lime production industry (quarrying operations) and the ornamental stones industry (sawing operations).Particular attention has been paid to clay content, as consistency of fresh mortars was varying, while other physical characteristics like granulometry remained the same. Relationship between the physico-chemical properties of the fillers and the properties of fresh and hardened mortars are brought forward. Even if it may affect fresh properties of mortars, results clearly show that clay type and content has minor influence than limestone filler itself.