贵州大方县百纳村高岭土的理化及工艺性能研究

从矿山采集代表性的高岭土样品,球磨并过80目筛备用。利用X射线荧光光谱仪(XRF)、X射线衍射仪(XRD)、综合热分析仪(DTA-TG)、场发射扫描电子显微镜(FE-SEM)和透射电子显微镜(TEM)对高岭土的化学成分、矿物组成、理化性质与微观形貌进行了表征,并详细考察了其多项工艺性能指标。结果表明:该高岭土的主要矿物组成为多水高岭石(84.77wt%)和绿脱石(1.33wt%),具有典型的六方管状结构,管直径在十几到几十个纳米不等,管长约为几百纳米。该高岭土可塑性较好,阳离子交换容量值很高,流动性和触变性小,干燥收缩大,干燥强度较低。由于该高岭土样品的Fe2O3(0.43wt%)含量低,从而具有较高的烧成白度,1250℃下烧成样品的白度为70.8%。     

毕节市兴丰村高岭土的理化及工艺性能研究

从矿山采集具有代表性的高岭土,精选后球磨并过80目筛备用。利用X射线荧光光谱仪（XRF）、X射线衍射仪（XRD）、综合热分析仪（DTA-TG）、场发射扫描电子显微镜（FE-SEM）和透射电子显微镜（TEM）对高岭土的化学成分、矿物组成、理化性质和微观形貌进行了表征,并详细考察了其多项工艺性能指标。研究结果表明:该高岭土的主要矿物组成为高岭石（83.23wt%）和埃洛石（15.93wt%）,属粘土类矿物,其中高岭石呈典型的片层状结构,埃洛石呈六方管状结构。该矿物原料可塑性非常好,阳离子交换容量值较小,流动性和触变性较小,干燥收缩较大,干燥强度较大。由于该矿物中碱金属和碱土金属氧化物含量均较低,因此烧结温度较高（烧结温度高于1350℃）,并且其含有少量的Fe₂O₃（0.49wt%）和Cr₂O₃（0.20wt%）,导致烧成（1250℃）白度不高,为64.5%。     

贵州大方县联兴村粘土的理化及工艺性能

利用X射线荧光光谱仪(XRF)、X射线衍射仪(XRD)、综合热分析仪(DTA-TG)、场发射扫描电子显微镜(FE-SEM)和透射电子显微镜(TEM)对贵州省大方县联兴村粘土的化学成分、矿物组成、理化性质和微观形貌进行了分析表征,并详细测试了其多项工艺性能指标。得出该粘土的主要矿物组成为伊利石(47.2wt%)、石英(50.8wt%)和锐钛矿(1.2wt%),呈典型的片层状结构。该矿物原料可塑性低、阳离子交换容量低、流动性较小、触变性较大、干燥收缩小、干燥强度较大。粘土矿物中碱金属和碱土金属总含量不高(3.57wt%),且Al2O3含量较低(14.84wt%),因此烧结温度不高(烧结温度范围为1200℃~1250℃),并且其含有较多的Fe2O3(1.16wt%)和TiO2(0.67wt%),导致烧成白度很低,1250℃下烧成白度仅为23.04%。     

贵州大方县中路村绿豆岩的理化及工艺性能研究

从矿山采集具有代表性的绿豆岩,球磨并过80目筛备用。利用X射线荧光光谱仪(XRF)、X射线衍射仪(XRD)、综合热分析仪(DTA-TG)、场发射扫描电子显微镜(FE-SEM)和透射电子显微镜(TEM)对绿豆岩的化学成分、矿物组成、理化性质和微观形貌进行了表征,并详细考察了其多项工艺性能指标。研究结果表明:该绿豆岩的主要矿物组成为伊利石(58.51%)、蒙脱石(10.72%)和石英(30.07%),属粘土类矿物,呈典型的片层状结构。该矿物原料可塑性良好、阳离子交换容量值较高、流动性较小、触变性较大、干燥收缩很小、干燥强度较大。由于该矿物中含有较高的K2O(8.46wt%)和MgO(6.01wt%),因此烧结温度较低(烧结温度范围为900～950℃),并且其含有相对较高的Fe2O3(1.66%wt)和TiO2(0.23wt%),导致烧成白度低,仅为16.17%。     

贵州毕节金银山粘土的理化及工艺性能研究

从矿山采集具有代表性的粘土,球磨并过80目筛备用.利用X射线荧光光谱仪(XRF)、X射线衍射仪(XRD)、综合热分析仪(DTA-TG)、场发射扫描电子显微镜(FE-SEM)和透射电子显微镜(TEM)对粘土的化学成分、矿物组成、理化性质和微观形貌进行了表征,并详细考察了其多项工艺性能指标.研究结果表明:该粘土的主要矿物组成为白云母(27.69wt％)、高岭石(33.12wt％)、石英(35.31wt％)和板钛矿(0.91wt％),呈典型的片状结构.该矿物原料可塑性非常好、阳离子交换容量低、流动性较大、触变性较小、干燥收缩很小、干燥强度较大.由于该粘土矿物中碱金属和碱土金属总含量不高(4.73wt％),因此烧结温度较高(烧结温度范围为1250℃～1300℃),并且其含有较多的Fe2O3(1.22wt％)和TiO2 (0.90wt％),导致烧成(1250℃)白度较低,仅为41.12％.     

贵州毕节毛家屯粘土的理化及工艺性能研究

从矿山采集具有代表性的粘土,球磨并过80目筛备用.利用X射线荧光光谱仪(XRF)、X射线衍射仪(XRD)、综合热分析仪(DTA-TG)、场发射扫描电子显微镜(FE-SEM)和透射电子显微镜(TEM)对粘土的化学成分、矿物组成、理化性质和微观形貌进行了表征,并详细考察了其多项工艺性能指标.研究结果表明:该粘土的主要矿物组成为高岭石(32.17wt.％)、伊利石(49.03wt.％)、蒙脱石(8.53wt％)、石英(6.72wt.％)和锐钛矿(3.36wt.％),呈典型的片层状结构.该矿物原料可塑性非常好,阳离子交换容量很高,流动性较小,触变性较大,干燥收缩很大,干燥强度较低.由于该粘土矿物中碱金属和碱土金属总含量不高(4.02wt％),因此烧结温度较高(烧结温度范围为1250℃ ～1300℃),并且其含有较多的Fe2O3(1.34wt.％)和TiO2 (3.36wt.％),导致烧成(1250℃)白度较低,仅为34.84％.     

丰顺九龙高岭土工艺性质及出口瓷泥的研究

测定了九龙高岭土的可塑性、化学组成、粒度及其分布、白度等 ,并且做了X—射线和透射电子显微镜分析。测定结果表明 :九龙高岭土的主要矿物组成为高岭石、石英和伊利石 ,其晶体形貌一部分呈假六角片状 ,一部分呈不规则片状 ,少部分为粒状。在出口瓷泥中 ,加入了 12 %的可塑粘土。     

贵州毕节永安碗厂粘土的理化及工艺性能研究

从矿山采集具有代表性的粘土,球磨并过80目筛备用.利用X射线荧光光谱仪(XRF)、X射线衍射仪(XRD)、综合热分析仪(DTA-TG)、场发射扫描电子显微镜(FE-SEM)和透射电子显微镜(TEM)对粘土的化学成份、矿物组成、理化性质和微观形貌进行了表征,并详细考察了其多项工艺性能指标.研究结果表明:该粘士的主要矿物组成为伊利石(9.49 wt％)、累托石(45.36 wt％)和石英(43.68 wt％),呈典型的片状结构.该矿物原料可塑性良好、阳离子交换容量低、流动性较小、触变性较大、干燥收缩较大、干燥强度较低.由于该粘土矿物中碱金属和碱土金属总含量不高(4.25 wt％),因此烧结温度较高(烧结温度范围为1250～ 1300℃).该粘土矿物中Fe2 O3(0.72 wt％)和TiO2(0.27 wt％)总体含量不高,因此具有较高的烧成白度,1250℃下烧成的白度值为50.59％.     

龙岩高岭土的组成与结构研究

本文采用X射线荧光光谱仪(XRF)、X射线衍射仪(XRD)、激光粒度仪、综合热分析仪(DTA/TG)、场发射扫描电镜(FE-SEM)以及透射电镜(TEM)等测试手段对福建龙岩高岭土进行了组成及结构的研究.结果表明:龙岩高岭土的矿物组成主要由高岭石、多水高岭石和伊利石组成.一定量伊利石的存在是龙岩高岭土的化学组成中含有较高K2O组分的直接原因,这导致其耐火度不高.龙岩高岭土的显微结构为片状和管状混合结构,多水高岭石呈管状,结晶程度最差;高岭石呈不规则薄片状,结晶程度较差;伊利石呈板片状,晶化程度最好.     

景德镇高岭村高岭土矿物相的研究

根据对高岭村高岭土样品的X光衍射分析和电子显微镜分析,本文认为:其中脉状高岭土样品的矿物相简单,以多水高岭石为主;而砂状高岭土样品的矿物相较复杂,有高岭石,伊利石,钠长石,白云母和石英等。此外在脉状高岭土样品的电镜分析中,还发现其中多水高岭石大多数呈又粗又短的管状晶形。     

难沉降煤泥水组成及特点的研究

以山东某选煤厂的难沉降煤泥水为研究对象,利用现代分析测试手段,分析难沉降煤泥水的水质特性、矿物组成、粒度组成、表面电性等。结果表明导致煤泥水难沉降的主要原因是煤泥水中粘土矿物含量较高,泥化现象严重,颗粒粒度小,表面带有很强的负电荷,具有胶体稳定特性,从而导致其难以沉降。     

MINERAL CONSTITUENTS AND ORIGIN OF A CERTAIN KAOLIN DEPOSIT NEAR SPOKANE,WASHINGTON1

This paper discusses petrographic and mineralogic features of kaolinite and associated minerals from a certain kaolin deposit near Spokane, Wash. Here the kaolin occurs in dikes, veinlets cutting a sandy material, and has field relations and mineral associations that are not in harmony with the usual conception of residual deposits due to weathering. The evidence points strongly to endomorphic action or perhaps even direct primary origin from highly aqueous magmatic solutions.     

Surface‐treated kaolin minerals as a complement or substitute to glass fibers in thermoplastics

Glass fiber (GF)‐related mold abrasion and tool wear make it undesirable for certain thermoplastics applications. Furthermore, fiber attrition during processing and orientation sensitivity raise concerns over compromised performance. In this study, kaolin minerals with varying properties and surface‐treatments are tested to potentially replace GFs in nylon composites. Composites are melt‐compounded and injection molded using lab‐scale and industrial‐scale equipment. Mechanical properties (tensile, flex, impact), heat distortion temperature, and thermal decomposition using thermogravimetric analysis (TGA) are used to comparatively characterize kaolin composite formulations against 30% weight GF composites. Kaolin minerals with high aspect ratio and good interfacial contact are found to show strength and modulus improvements up to 80% that of GF. Additionally, low aspect ratio kaolin composites were found to surpass GF composites in impact strength. A synergistic effect is found between high and low aspect ratio kaolin that can potentially lead to further enhancement in properties with the added possibility of blending minerals to customize composite performance. Such findings suggest that kaolin minerals can be used to customize the properties of composites in manners previously unattainable through GF usage alone. Scale up trials show potential for kaolin to replace GFs at industrial levels. POLYM. ENG. SCI., 59:E330–E338, 2019. © 2018 Society of Plastics Engineers     

Study of clay's mineralogy effect on mechanical properties of ceramic body using an experimental design

Three clays minerals namely illite (I), montmorillonite (M), and kaolin (K) were chosen as references to study the effect of mixture composition of clays on the mechanical properties and the shrinkage of the fired ceramic. The study was accomplished using the experimental design methodology. More specifically, a mixture design was carried out in order to establish relationships between mechanical strength and shrinkage of finished products and the proportions of the three clay mineral references in the mixture. The statistical study shows that the fitted models were adequate to describe these properties of fired ceramic bodies. The results demonstrate that the mechanical resistance was mainly governed by the amount of montmorillonite mineral. In fact, the mixture design performed in this study shows clearly that montmorillonite can be incorporated in industrial ceramic products up to 45 wt% with high mechanical resistance. On the other hand, the shrinkage decreases strongly with the amount of kaolin in the mixture and increases with the amount of illite while montmorillonite exhibits moderate effect on this property. The higher strength was shown in mixture in which mullite and anorthite appear together due to the presence of kaolinite and illite and give, as a consequence, a synergic power.     

贵州某高岭土除铁试验研究

贵州某硬质高岭土矿石中铁含量较高,不能直接利用,必须进行除铁。针对高岭土矿石中铁矿物主要为黄铁矿和弱磁性氧化铁矿物,且其嵌布粒度极细的特点,开展了浮选除铁、强磁选除铁探索试验。并在此基础上进行了强磁-酸浸及强磁-氧化酸浸试验。结果表明,采用强磁选-氧化酸浸的方法效果较好,可将高岭土中的Fe含量由1.44%降到0.75%。     

Self-formed mullite containing refractory barium silicate cements and their castable applications

Abstract

Six batches consisting of different percentages of barite, kaolin and calcined alumina were sintered at 1500–1600°C for 3 h to produce self-formed mullite containing barium silicate cements. The compositions of the cement mixes were investigated using X-ray diffraction. Physicomechanical, sintering and refractory properties were tested according to standard specifications. Each of the mixes, composed mainly of varying proportions of mullite and dibarium silicate minerals, showed different behaviour. The best compromise between cementing, sintering and refractory properties was provided by the mix prepared from 60 wt-% barite, 25 wt-% kaolin and 15 wt-% calcined alumina, consisting of about 54 wt-% dibarium silicate and 33 wt-% mullite. Self-formed mullite containing castable prepared from 15 wt-% of a fine powder of the chosen mix as the cement and 85 wt-% of graded aggregate of the same mix showed good volume stability, high mechanical properties, high thermal shock resistance as well as high loadbearing capacity.