高岭土原位晶化体系中焙烧微球特性研究

主要对高岭土焙烧微球的特性及其对高岭土原位晶化性能的影响进行了研究。高岭土焙烧微球中的活性SiO2和AL2o3，是合成NaY分子筛的“营养质”，可根据合成NaY含量的要求，确定高岭土微球的焙烧温度，调变不同温度焙土的比例及液相组成的配比，以达到合成的目的。     

非均相酯化催化剂PW12/高岭土的制备及其催化合成异丁酸丁酯

以高岭土为载体、磷钨酸( PW12)为活性组分制备了非均相酯化催化剂PW12/高岭土,将其用于异丁酸与正丁醇的催化酯化合成异丁酸丁酯,考察了高岭土以及催化剂的焙烧温度、焙烧时间和磷钨酸与高岭土的质量比等因素对异丁酸丁酯酯化率的影响,并采用FTIR技术对载体、活性组分及催化剂进行了表征.结果表明,催化剂适宜的制备条件为:...     

煤系高岭土Y型分子筛的磷改性试验研究

本试验以内蒙古煤系高岭土为原料,采用水热合成法合成Y型分子筛并对其进行磷改性;利用扫描电镜(SEM)、X-射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)和BET对经过不同试验条件改性的分子筛进行表征,考察了磷的浓度、焙烧温度以及焙烧时间等因素对改性分子筛结构的影响。试验结果显示:改性后的样品具有典型的Y型分子筛的X射线衍射峰和红外振动谱线,且改性后的分子筛颗粒均匀,结晶度、晶胞参数和硅铝比都下降。     

高岭土合成4沸石分子筛的技术工艺

本文系统地阐述了高岭土台成4A沸百分子筛的优势及技术工艺过程，并对4A沸石的质量质标及其检验方法作了简要叙述，探讨了高岭土法合成4A沸石分子筛的意义及前景．     

LSX型体分子筛焙烧与二次晶化试验研究

以低硅铝比X(LSX)粉体、高岭土和LSX型体分子筛为研究对象,利用XRD和TG-DTA等手段对其物相和热稳定性进行了表征,探讨了不同晶化条件对LSX型体分子筛静态水吸附量的影响。研究表明,随着焙烧温度的升高,LSX粉体的结晶性遭到破坏,高岭土逐渐转化为偏高岭土。LSX型体分子筛的最佳焙烧温度为600℃,在二次晶化温度为95℃、晶化时间为5 h、氢氧化钠浓度为2 mol/L时,LSX型体分子筛的最佳静态水吸附量达到了33.5%。     

以低质高岭土合成4A分子筛

采用地方低质高岭土和煤矸石，通过精选加工处理后作为合成原料，进行了详细的活化试验和合成试验，总结出了各工艺参数对产品性能的影响关系，并对此作了理论探讨。试验结果显示．氏搏击高岭土完全可以生产出优良的４Ａ分子筛。     

高岭土合成4A沸石分子筛的技术工艺

本文系统地阐述了高岭土合成４Ａ沸石分子筛的优势及技术工艺过程，并对４Ａ沸石的质量质标及其检验方法作了简要叙述，探讨了高岭土法合成４Ａ沸石分子筛的意义及前景。     

利用流化床粉煤灰合成分子筛的研究

利用工业废渣循环流化床粉煤灰成功合成出较高结晶度的X、P型分子筛,合成过程无须高温焙烧预处理;通过XRD分析表征发现,该法合成分子筛结晶度较高,X型分子筛相对结晶度达68%~75%,P型为55%。     

利用红辉沸石合成4A分子筛试验研究

首先分析了广西红辉沸石的组成特点及热稳定性 ,然后以它为原料 ,用酸洗→焙烧→碱化→晶化这一工艺过程合成了 4A分子筛 ,并探讨了分子筛的合成条件。     

珍珠岩高温碱溶合成4A分子筛实验研究

将珍珠岩与氢氧化钠混合高温焙烧，焙烧料溶解后用水热合成法合成了4A分子筛，采用正交实验确定了焙烧与合成的工艺参数，为珍珠岩的综合利用开辟了新途径，为合成4A分子筛提供了一种廉价原料。     

Calcination of low-grade laterite for concentration of Ni by magnetic separation

With the continuous depletion of high-grade nickel ores such as millerite and niccolite, nickeliferous laterites have become the major source for the production of nickel metal. However, only 42% of the world’s production of nickel comes from laterites, since the concentration of Ni is relatively low (ca. 2 wt.%). In addition, other metals, such as magnesium, iron and silicon can be found in laterite, which make the concentration of nickel even more difficult.In this study, a low-grade nickeliferous laterite ore was first calcinated and then processed by using a wet magnetic separator in order to recover nickel. Since, the ore contains both Ni and Fe, the calcination of laterite is effective in altering the crystalline structure of Fe species and therefore its magnetic properties, which in turn enable the selective concentration of nickel by magnetic separation that is an easy and environmentally-friendly technique. The experimental results have indicated the importance of carefully controlling: (1) the calcination temperature; (2) the pulp density and (3) applied magnetic field strength. The main finding of this work was that magnetic separation is effective in recovering 48% of nickel from laterite, increasing the Ni grade in the recovered product from 1.5% to 2.9%, when prior to the separation the ore was calcinated at 500 °C for 1 h.     

煤系煅烧高岭土颗粒湿法超细化过程的机械力化学效应

研究了超细煤系煅烧高岭土制备过程中由于颗粒细化所产生的机械力化学效应。结果表明，湿法超细粉碎煤系煅烧高岭土颗粒，可导致颗粒晶体结构发生晶格畸变和非晶化，同时颗粒密度降低，白度有所提高。机械力化学效应使煤系煅烧高岭土产生的高活性表面和化学活性点为其进一步深加工提供了有效途径。     

硫酸铵焙烧活化石棉尾矿提取镁实验研究

本实验采用硫酸铵与石棉尾矿用高温炉焙烧的方法提取镁。首先利用差热-热重法分析石棉尾矿与硫酸铵混合物的热分解和化学反应的热效应,得出石棉尾矿与硫酸铵混合物在240~500℃下产生分解、失重。将石棉尾矿与硫酸铵混合均匀后在320℃、400℃和460℃下焙烧1h,用XRD分析焙烧产物,得出在320℃时石棉尾矿和硫酸铵反应主要生成(NH4)2Mg(SO4)2和(NH4)2Mg2(SO4)3;在400℃时主要生成(NH4)2Mg2(SO4)3;在460℃时主要生成MgSO4,由于吸水变为MgSO4.6H2O。研究了硫酸铵与石棉尾矿不同物质的量的配比、焙烧温度和焙烧时间对镁浸取率的影响,得出当硫酸铵与石棉尾矿物质的量之比为2∶1、焙烧温度为460℃、焙烧时间为60min时,镁的浸取率为83.1%。     

CM51型粉磨机及配套设备调试技术及问题探讨

介绍CM 51型粉磨机及配套设备应用于超细粉磨富含黄铁矿硬质高岭土及煅烧滤饼再粉碎的调试技术 ,分析和探讨影响粉磨机系统工作能力的主要因素及技术要点 ,指出调试生产中值得注意的问题。     

高铁锌精矿焙砂强化浸出过程中铁的行为走向研究

针对高铁锌焙砂开展了强化浸出工艺试验研究, 重点考察了浸出过程中铁的行为走向及其控制。结果表明:经中浸和弱浸两段浸出后, 仅约15%的铁浸出进入溶液;铁的浸出主要发生在热酸和高酸浸出段, 两段浸出率合计接近80%;如果浸出液中铁离子浓度过高(>30 g/L), 在低酸条件下会形成铁矾类等复盐沉淀物, 导致浸出渣渣率偏高, 并干扰后续强化浸出作业。     

Concentrating Nickel from Leaching Solutions for Oxidized Nickel Ore Based on Precipitation of Hydrates

The article focuses on concentrating of nickel from lean solutions of leaching of oxidized nickel ore. The proposed block diagram of process flow chart for such solutions includes hydrolytic removal of admixed iron and aluminium and precipitation of nickel concentrate by calcinated magnesia. As a result, nickel content of the concentrate is 26–26% at the recovery of 95–97%. The issues of decontamination and recycling of the solutions are solved.     

电解锰渣体系中硫酸钙特性的研究

采用DTA与XRD分析了煅烧温度对电解锰渣中主要物质硫酸钙晶型的影响, 并检测了电解锰渣中硫酸钙溶解度的变化, 以及煅烧锰渣掺入矿渣中对矿渣的激发性能。结果显示: 电解锰渣中硫酸钙在71.6, 133.9, 540.8, 875.9和1 149.4 ℃发生晶型转变, 经过350 ℃以上煅烧的电解锰渣中硫酸钙溶解度较大, 对矿渣的活性激发效果也较好。研究结果可为电解锰渣应用于胶凝材料的生产提供理论依据。     

Preparation and characterization of conductive antimony-doped tin oxide (ATO) nanoparticles

In this paper, conductive antimony-doped tin oxide (ATO) composite particles is prepared by hydroxylation method of metal alcoxides. This method has many advantages such as little pollution, low cost, simple sheet and equipment. The synthesis processing and the ATO nanoparticles are characterized by means of transmission electron microscope (TEM), X-ray diffraction (XRD), thermal gravimetric and differential thermal analysis, and BET. The results show that the ATO nanoparticles is tetragonal rutile crystal structure. TEM show that the particles are monodispersed with weak aggromation. The size of the particles calcinated at 700 is about 8nm. The specific areas are 153 m2 · g-1. In addition to, ATO nanop articles have good electric properties     

Preparation and characterization of conductive antimony-doped tin oxide (ATO) nanoparticles

In this paper, conductive antimony-doped tin oxide (ATO) composite particles is prepared by hydroxylation method of metal alcoxides. This method has many advantages such as little pollution, low cost, simple sheet and equipment. The synthesis processing and the ATO nanoparticles are characterized by means of transmission electron microscope (TEM), X-ray diffraction (XRD), thermal gravimetric and differential thermal analysis, and BET. The results show that the ATO nanoparticles is tetragonal rutile crystal structure. TEM show that the particles are monodispersed with weak aggromation. The size of the particles calcinated at 700 is about 8nm. The specific areas are 153 m2 · g-1. In addition to, ATO nanop articles have good electric properties     

裂解温度对煤粉裂解特性影响的模型预测和实验研究

裂解温度是影响煤粉裂解特性的主要因素之一,采用CPD模型对裂解产品的分布进行预测,计算结果表明,CPD模型对煤粉裂解产物分布的预测具有一定的准确性,可以根据煤质特性参数初步判断煤粉一次裂解产品的产率。通过固定床裂解炉,采用快速升温的方式对煤粉进行裂解,研究了500~1 000℃裂解终温对我国典型的烟煤和褐煤裂解特性的影响。研究表明,裂解终温越高,裂解气产量越高,剩余固体质量越少;经过500℃和1 000℃的裂解,神华烟煤和宝日希勒褐煤挥发分析出量分别增加301.48 mL/g和347.82 mL/g,固体失重率分别增加12.49%和15.35%。因裂解气各组分的产生机理不同,裂解气中H_2,CH_4和CO的产量随裂解温度的升高而升高,CO_2的产量随裂解温度的升高而降低。