硫铁铝酸钡钙水泥的研究

以硫铝酸钡钙水泥为基础,用分析纯化学试剂Fe2O3取代其主矿物C2.75B1.25A3S中的A l,取代质量为1∶1,从而合成一种新型矿物水泥,并研究该水泥的力学性能。水泥的成分采用XRD和SEM进行分析研究,并对其微观结构合水化机理进行了初步分析。结果表明:铁离子可以部分取代铅离子,并有利于降低烧成温度。取代质量为1∶1时,晶形发育良好,晶界清晰,强度较高。

铁铝型高水速凝材料作为井下充填胶结剂的试验研究

分析并阐述了铁铝型高水速凝材料作为一种新型矿山充填胶凝材料所具有的基本性能。它制浆后，初凝时间为６０ｍｉｎ，终凝时间２１０ｍｉｎ。其硬化体有良好的耐水性和耐腐蚀性，在承载破坏后还具有重结晶性。应用铁铝型高水速凝材料不仅可解决矿山充填料不足、全尾充填存在的问题，还可提高采矿强度和生产效率。由于该材料的主要基料来源广，且生产工艺简单，因而推广应用前景良好。

铁铝型高水速凝充填材料物化性能的研究

分析并阐述了铁铝型高水速凝材料作为一种新型矿山充填胶凝材料所具有的基本性能。它制浆后 ,初凝时间为 6 0min ,终凝时间 2 10min。其硬化体有良好的耐水性和耐腐蚀性 ,在承载破坏后还具有重结晶性。应用铁铝型高水速凝材料不仅可解决矿山充填料不足、全尾充填存在的问题 ,还可提高采矿强度和生产效率。由于该材料的主要基料来源广 ,且生产工艺简单 ,因而推广应用前景良好。

Characteristic and optimization of ferrite-rich sulfoaluminate-based composite cement suitable for cold region tunnels

To develop suitable grouting materials for water conveyance tunnels in cold regions,firstly,this study investigated the performance evolution of ferrite-rich sulfoaluminate-based composite cement(FSAC grouting material)at 20 and 3℃.The results show that low temperature only delays the strength development of FSAC grouting material within the first 3 d.Then,the effect of four typical early strength synergists on the early properties of FSAC grouting material was evaluated to optimize the early(£1 d)strength at 3℃.The most effective synergist,Ca(HCOO)_(2),which enhances the low-temperature early strength without compromising fluidity was selected based on strength and fluidity tests.Its micro-mechanism was analyzed by XRD,TG,and SEM methods.The results reveal that the most suitable dosage range is 0.3 wt%−0.5 wt%.Proper addition of Ca(HCOO)_(2)changed the crystal morphology of the hydration products,decreased the pore size and formed more compact hydration products by interlocking and overlapping.However,excessive addition of Ca(HCOO)_(2)inhibited the hydration reaction,resulting in a simple and loose structure of the hydration products.The research results have reference value for controlling surrounding rock deformation and preventing water and mud inrushes during the excavation in cold region tunnels.

矿用低成本高水速凝材料的开发及应用研究

铁铝型高水速凝材料以铁铝水泥为主要基料,具有速凝、早强及高固水特性。作为充填胶凝材料,其主要性能可满足矿山生产的实际需要。此外,由于该材料的原料来源广、生产工艺简单,并可利用低品位的铁矾土,陶瓷工业、耐火材料工业废弃的高铁矾土,以及制铝工业的低品位铝矿石和工业废渣,具有较大的社会效益、环境效益和良好的开发应用前景。