超细煤系煅烧高岭土粉体制备的工艺参数优化

以盘式搅拌磨为超细粉碎设备,系统地研究了粉碎法制备超细煤系超煅烧高岭土粉体的工艺参数,结果表明,矿浆浓度,磨矿时间,研磨介质添加量和配比,叶轮搅拌速度是制备超细煤系煅烧高岭土粉体的重要工艺参数,合理地选择这些工艺参数,才能制备出粒度－２μｍ含量大于９０％的超细煤系煅烧市高岭土粉体。     

蒲白矿区伴生粘土矿产在乳胶漆中的应用

蒲白矿区伴生粘土矿产煤系高岭土，在经过一定工艺加工后，生产出煤系超细煅烧高岭土，用其部分替代钛白粉作颜填料，可生产出合格的ＸＫＮ苯丙乳胶漆，为煤系伴生粘土矿产的综合利用开辟了一条新的途径。     

高比表面积煤系高岭土材料的制备及其结构表征

高比表面积改性煤系高岭土具有优异的性能,现已被广泛地应用于多种行业。本文以内蒙煤系高岭土为原料,将其高温煅烧制得偏高岭土后,再经盐酸改性用以制备高比表面煤系高岭土材料;通过X射线衍射(XRD)、差热-热重分析(DTA-TGA)和N2吸附-脱附等手段对改性前后煤系高岭土的晶体结构及比表面积进行了表征,实验考察了煅烧温度、煅烧时间、盐酸用量、盐酸浓度及反应时间对煅烧煤系高岭土比表面积的影响,确定了酸改性煤系高岭土的最佳工艺条件;在最佳工艺条件下制备的盐酸改性煤系高岭土材料的比表面积高达465 m2/g。     

锐钛型TiO_2性能研究 I.影响化纤钛白原料性能的因素

研究了硫酸法ＴｉＯ２生产中常见杂质离子及煅烧添加剂对化纤钛白白度、光色互变性及分散性等的影响,考察了工业生产中关键单元操作对提高化钎钛白应用性能的作用。同时给出了能提高化纤钛白应用性能的煅烧添加剂配比。     

走自主创新之路提升企业竞争力

滁州格锐矿业有限责任公司是一家民营科技型企业,也是安徽省高新技术企业,主营各类非金属矿功能新材料的研发和生产.公司主导产品为GR复合钛白颜料和湿法超细绢云母材料,其中GR复合钛白颜料在国内外首次实现复合钛白的产业化生产,目前尚为国内独家生产;湿法超细绢云母材料独家采用湿法超细提纯工艺,产品现已占据国内涂料用高档绢云母市场的70%以上.     

锐钛型TiO2性能研究：Ⅰ.影响化纤钛白原料性能的因素

研究了硫酸法ＴｉＯ２生产中常见杂质离子及煅烧添加剂对化纤钛白白度、光色互变性及分散性等的影响，考察了工业中关键单元操作对提高化钎钛白应用性能的作用。同时给出了能力提高化纤钛白应用的煅烧添加加剂配比。     

在油酸钠分散体系中用平炉尘制备超细Fe3O4

包头钢铁公司的平炉尘含铁量高．粒径微细，以γ-Fe2O3为主．经过提纯分级可以作为生产超细磁性材料的原料．研究了平炉尘在油酸钠分散条件下制备超细Fe3O4．结果表明．加入表面活性剂可以降低超微粒子的表面能，减少其团聚倾向．得到粒径更细且均匀的超细Fe3O4粉末．     

氧化铁的机械力超细化及表面改性

运用机械力化学方法对煅烧法所获得的氧化铁进行超细化和表面改性.研究了多种表面活性剂和助剂用量及对其性能的影响.为获得粒径均一的超细氧化铁,通过在不同球配比和不同球料比的条件下进行实验,得到最佳球配比和最佳球料比.     

煅烧气氛对煤系高岭岩热活化的影响

分别在空气、N2和CO2气氛下进行煤系高岭岩的热活化实验,通过热分析、X射线衍射、红外光谱和盐酸浸取等手段研究了煤系高岭岩的热分解过程,讨论了煅烧气氛对煤系高岭岩热分解产物结构和活性的影响。结果表明,煤系高岭岩煅烧产物的活性随着高岭石脱羟基和分解程度的提高而增加,空气气氛下煤质的燃烧促进了高岭石的分解。当温度超过600...     

超细TiO2修饰的粉煤灰催化光降解对氧磷的研究

将超细Ti02吸附在粉煤灰上,通过煅烧获得稳定性良好的负载Ti02的粉煤灰颗粒。将此材料作为光催化剂,在不同反应条件下,对其催化对氧磷的光降解行为进行了研究．     

Coating mechanism of nano-TiO<Subscript>2</Subscript> films on the surface of ultra-fine calcined coal kaolin particles

A new type of mineral composite was made by calcined coal kaolin. The interaction mechanism of an inorganic modification reagent TiOSO₄ with the surface of ultra-fine calcined coal kaolin particles (substrate) was studied by X-ray photoelectron spectroscopy. The results show that chemisorption exists in the phase boundary between the modification agent and the substrate surface, while physical adsorption occurs on the modification layers of hydrate titanium dioxide. The interaction force was calculated and analyzed according to DLVO theory between ultra-fine calcined coal kaolin particles and hydrate titanium dioxide nano-particles in the modification system. It is shown that the both electrostatic force and van der Waals force are attractive, and the coacervation between ultra-fine calcined coal kaolin particles and hydrate titanium dioxide nano-particles leads to the coating of hydrate titanium dioxide on the surface of ultra-fine calcined coal kaolin particles.     

改性煤系煅烧高岭土晶化焙烧产品分析测试

运用SEM,TEM,XRD等对改性煤系锻炼高岭土昌化焙烧产品进行了测试,分析了晶化焙烧工艺所带来的改性煤高岭土超细颗粒性能的变化。例如,基体颗粒表面水合二氧化钛由非晶态转化为晶态,膜覆包均匀等,最终产品可以作为钛白粉的替代品。     

高岭土/PVC复合电缆料的制备与性能研究

采用硬脂酸、硅烷偶联剂和自制的含有三甲氧基硅烷侧基的大分子表面处理剂,分别处理了煅烧高岭土、添加一定比例纳米级的煅烧高岭土,与活性CaCO3混合填充PVC树脂,制备改性电缆料.研究了不同表面处理剂和不同比例的纳米级高岭土对电缆料的电学性能、拉伸性能和低温冲击脆性的影响.三种实验结果表明,采用大分子表面处理剂处理添加含1%-3%的纳米级高岭土填充的PVC电缆料,各项性能最佳.     

Influence of acid leaching and calcination on iron removal of coal kaolin

Calcination and acid leaching of coal kaolin were studied to determine an effective and economical preparation method of calcined kaolin. Thermogravimetric-differential thermal analysis (TG-DTA) and X-ray diffraction (XRD) demonstrated that 900℃ was the suitable temperature for the calcination. Leaching tests showed that hydrochloric acid was more effective for iron dissolution from raw coal kaolin (RCK), whereas oxalic acid was more effective on iron dissolution from calcined coal kaolin (CCK). The iron dissolution from CCK was 28.78wt%, which is far less effective than the 54.86wt% of RCK under their respective optimal conditions. Through analysis by using M?ssbauer spectroscopy, it is detected that nearly all of the structural ferrous ions in RCK were removed by hydrochloric acid. However, iron sites in CCK changed slightly by oxalic acid leaching because nearly all ferrous ions were transformed into ferric species after firing at 900℃. It can be concluded that it is difficult to remove the structural ferric ions and ferric oxides evolved from the structural ferrous ions. Thus, iron removal by acids should be conducted prior to calcination.     

Preparation and visible-light photocatalytic property of nanostructured Fe-doped TiO2 from titanium containing electric furnace molten slag

Nanostructured Fe-doped titanium dioxide was synthesized from titanium containing electric furnace molten slag (TCEFMS) by using an alkali fusion, followed by a hydrolyzation-acidolysis-calcination route. The effects of alkali/slag mass ratio, calcinating temperature, calcinating time, and water/slag mass ratio on the extraction efficiency and purity of products were systematically studied in this paper. It is indicated that the best extraction efficiency of nanostructured Fedoped titanium dioxide is 99.35%, when the molten slag is calcinated at 700°C for 1 h with the mass ratio of alkali/molten slag of 1.5:1. The influence of alkali/slag mass ratio on the photocatalytic activity of final products was evaluated by the photodegradation of methyl blue under visible light irradiation. A maximum photodegradation efficiency of 88.12% over 30 min was achieved under the optimum conditions.     

煤矸石酸溶法制得聚合氯化铝铁钙的形态

利用扫描电镜、X射线能谱、红外光谱、X射线衍射等现代分析检测技术对聚合氯化铝铁钙(PAFCC)进行形态结构研究与表征.比较了未煅烧合成产品和经煅烧合成的PAFCC产品形貌、特征基团及微晶相结构.结果表明:煅烧有利于制备聚合氯化铝铁钙;未煅烧合成产品是具有短柱状晶体形貌,主要含有钠、铝、铁、钙、氯等元素的化合物;PAFCC形貌呈类空心管柱状结晶体,是一种含有钙、铝、铁多羟基的无机高分子絮凝剂;煅烧使煤矸石活性增强,对合成PAFCC起了重要作用;在高岭土废水水样混凝实验中,制得的PAFCC混凝性能优于未煅烧合成产品和工业聚合铝(PAC).     

高岭土作橡胶填料的研究

高岭土经煅烧、粉碎、表面改性处理后可制取橡胶补强填料．经改性处理对补强性能影响的实验研究表明：高岭土由于其本身性质的特殊性，极易在表面进行接枝改性；过320目筛；经含量为3％的处理剂表面改性后的高岭土填料对橡胶具有较好的补强作用，可完全替代碳酸钙或陶土，产生较好的补强效果，也可部分替代炭黑，降低生产成本．表6，参3     

二氧化钛／活性炭复合材料的制备及光催化降解性能

研究对比三种锐钛矿二氧化钛溶胶的常温制备方法,选用溶胶凝胶法以四氯化钛和氨水为原料制得二氧化钛溶胶。浸渍处理表面经过氧化处理的活性炭。利用X射线衍射表征合成二氧化钛的晶相,扫描电镜观测了活性炭负载二氧化钛前后表面形貌变化,利用红外光谱（FT—IR）进行了结构表征,进行了对甲基橙的光催化降解实验。研究结果表明,氧化处理后活性炭表面形貌和光学活性发生了显著变化,氧化处理后活性炭表面负载二氧化钛膜变得较完整。复合材料与无负载、简单氧化处理的活性炭相比,显示了更高的对甲基橙的光降解能力。