Magnesite from Safonikha deposit

Conclusions Provided the Safonikha magnesite is blended, it can be used to make high-quality magnesite brick with a forsterite bond with apparent porosity 12–16%, bulk density 2.94–3.04 g/cm, compressive strength 1500 kg/cm and refractoriness-under-load of 2 kg/cm, 1670–1720°.The magnesite represented by the laboratory samples Nos. 1, 6, 8, 11, 13 and 14, and the second technological sample come up to the requirements for raw material for magnesite metallurgical powders. The magnesite in the remaining samples can also be used for making metallurgical powders, provided it is first enriched.     

Iron-Rich Sintered Glass-Ceramics from Industrial Wastes

In this study, sintered glass-ceramics made up of jarosite (a hazardous industrial waste) have been obtained by sintering high-iron-content glasses. Thermal gravimetry and differential thermal analysis, carried out in different atmospheres, have been utilized to explain the phase formations in the volume and iron oxidation on the surface of the glass particles. Low-angle XRD technique has been used to investigate the distribution of the phases formed on the surface of the glass during heating. The variation of density of the powder and bulk samples has been used to investigate the kinetics of phase transformation. The value of the Avrami constant, n, has been obtained as 1.33, which corresponds to the three-dimensional diffusion growth on a fixed number of nuclei. The sinter-crystallization process has been defined to yield a 40 wt% crystal phase. The results of this study have opened the possibility of preparing glass-ceramics with an original appearance, somewhat similar to that of granite, by reevaluating industrial wastes.     

利用工业废渣制备建筑微晶板的研究

以粉煤灰、矿渣和废玻璃等工业废渣为主要原料,添加助燃剂、粘结剂及可诱发玻璃体结晶和微分相的晶核剂等添加剂,采用陶瓷烧结法制备建筑微晶复合板。采用DTA和xRD等方法研究了配合料的成分、添加剂及烧成制度对微晶复合板制备工艺和材料性能的影响。     

以宝钢矿渣为主要原料制备微晶玻璃

阐述了我国炼钢矿渣尚未得到充分利用和处理的现状,并从原料配方、工艺过程和材料性能三方面介绍了利用矿渣制备微晶玻璃的方法.     

Magnesite — Spinel roof refractories from fused spinel

Refractories and Industrial Ceramics - The production technology for high-quality fused-spinel brick was developed under industrial conditions. Extensive industrial-scale tests demonstrated the...     

碳铬渣、硅锰渣微晶玻璃的研制

利用DTA、XRD、SEM等手段对以冶炼碳铬合金和硅锰合金浮渣、碎玻璃等为主要原料制备微晶玻璃进行了研究。经研究发现,碳铬渣具有很强的提高粘度和促析晶能力,而硅锰渣可以促进玻璃形成和熔制。在原料组成范围为：碳铬渣30%-40%,硅锰渣30%-40%,钠钙碎玻璃20%-30%（wt),1420℃下熔制1h获得的玻璃,在适当制度下热处理,可获得主晶相为透辉石及其固溶体的性能良好的微晶玻璃。     

利用工业废渣制备微晶玻璃进展

工业废渣大量排放造成了严重的环境污染,利用工业废渣制备矿渣微晶玻璃受到国内外的广泛关注.本文总结了目前已研究过用来制备微晶玻璃的工业废渣,并对其制备工艺、矿渣微晶玻璃成核和晶体长大等关键技术进行了阐述.认为工业废渣转制微晶玻璃是一项很有前景的材料开发和环保技术.     

Synthesis of Spinel from Caustic Magnesite and Alumina Dust

The sintering of a mixture of a caustic dust and an alumina dust collected from electric filters taken in MgO/Al₂O₃ ratios of 0.1, 0.28, 0.5, and 0.75 at 1650°C is studied. Materials with superior physicomechanical properties are obtained: open porosity, 1.2 – 8.4%; density, more than 3.5 g/cm³, and compressive strength, 160 – 410 MPa. High-density pellets (free of additions) are prepared at a MgO/Al₂O₃ ratio of 0.75, with compressive strength as high as 160 MPa.     

冶金工业废弃物微晶玻璃的研究概况

冶金工业是重要的原材料工业部门,随之产生了大量的固体废弃物,给自然环境造成了巨大的压力.以冶金固废制备微晶玻璃是冶金资源综合利用的一个重要途径.简要介绍了微晶玻璃的析晶行为及热处理工艺.综述了利用多种冶金固废制备微晶玻璃的研究概况.总结冶金固废微晶玻璃研究目前存在的不足及以后应着重的方向.     

尾矿微晶玻璃的制备及其性能研究

研究了以广西北海的高岭土尾矿为主要原料,采用烧结法制备矿渣微晶玻璃的可行性.确定了制备堇青石微晶玻璃的配方(质量分数/%):尾矿53.2,氧化镁18.0,氧化铝16.0,氧化铈4.4,其它8.4.采用X射线衍射(XRD)和扫描电镜(SEM)等手段研究了热处理工艺对微晶玻璃的相组成、微结构和烧结特性以及介电性能的影响.结果说明:烧结样品可以在900℃完全致密化,此时样品的主晶相为α-堇青石.该材料具有低的介电常数和低的线胀系数,是一种有应用前景的低温共烧陶瓷基板材料.     

氧化铬对菱镁矿风化石制备堇青石材料的影响

本研究以辽南地区菱镁矿风化石、工业氧化铝、二氧化硅微粉为原料制备堇青石材料,研究分析氧化铬对制备堇青石材料中晶相、晶胞参数、晶相含量及显微结构的影响.用XRD和SEM表征各试样中的晶相和显微结构;用X' Pert Plus软件对晶相的晶胞参数和晶相含量进行分析.结果表明:以菱镁矿风化石为原料经过1350℃烧成可以制备出以堇青石为主晶相的堇青石材料.氧化铬与堇青石形成有限的固溶体,当氧化铬加入量为0.8％时,堇青石晶格常数及晶胞体积都最大;小于1.2％的氧化铬的加入会降低了系统中晶相的含量,当氧化铬加入量大于1.2％时,系统中晶相的含量随着氧化铬加入量的增加而逐渐增大.     

花岗岩粉体烧结钙长石微晶玻璃的强韧化研究

以改性花岗岩粉体为主要原料,烧结法制备钙长石微晶玻璃,添加酸洗石棉、低结晶度莫来石纤维为增韧填料,系统研究微晶玻璃的烧结行为、力学性能及强韧化机理.结果表明:随着纤维添加量增大,微晶玻璃体积密度、断裂韧度和抗弯强度先增大后减小.添加3％酸洗石棉时,微晶玻璃结晶度为79％,钙长石含量为61％,抗弯强度和断裂韧度分别达到144 MPa和3.0 MPa·m1/2.微晶玻璃增韧机理为裂纹偏转和裂纹桥接,增强机理与纤维增韧、结晶度提高以及穿晶断裂有关.     

Porous Glass-Ceramics with Bacteriostatic Properties in Silver-Containing Titanium Phosphates: Control of Release of Silver Ions from Glass-Ceramics into Aqueous Solution

Porous glass-ceramics with the surface phase consisting predominantly of AgTi₂(PO₄)₃ crystal and the interior phase of LiTi₂(PO₄)₃ crystal are prepared by exchange of Ag⁺ions for Li⁺ions. In the present work, the release of Ag⁺ ions from glass-ceramics into aqueous solutions was investigated. Exchanged Ag⁺ ions were chemically stable in water. The as-exchanged glass-ceramics released Ag⁺ ions of 3045 equiv/g into phosphate buffer solution containing Na⁺ ions. X-ray diffraction analysis showed that silver-containing titanium phosphate crystalline phase in the glass-ceramics did not deteriorate even by heating at 900°C. The amount released from the heated glass-ceramics into the buffer solution was found to decrease drastically by 1–2 μequiv/g. The heated glass-ceramics showed excellent bacteriostatic properties. Glass-ceramics are expected to be novel bacteriostatic materials which have high thermal resistance and are medically safe.     

菱镁矿尾矿与硼泥合成橄榄石研究

本实验以菱镁矿尾矿、硼泥和硅石为主要原料,通过固相反应烧结制备镁橄榄石,研究随着硼泥和添加剂铁红(Fe2O3)引入量的不同对合成镁橄榄石材料相组成、结构及烧结性能的影响.利用XRD和SEM对烧后试样的矿物相组成和显微结构进行表征.结果表明:硼泥可以促进烧后镁橄榄石材料中晶粒异常长大,随着烧后镁橄榄石材料结构中液相的增多,系统中出现了顽火辉石相,烧后镁橄榄石材料体积密度逐渐增大,硼泥对镁橄榄石有促烧结作用.添加剂铁红与氧化镁形成镁铁固溶体,促进镁橄榄石材料结构致密,系统中引入3.51％铁红,烧后镁橄榄石材料体积密度提高24％.     

Dielectric Properties of the Calcium Silicate Glass-Ceramics Prepared from Agro-Food Wastes

Silicon - Glasses and glass-ceramics were prepared from agro-food waste ashes via melt-quench technique and converted into glass ceramics by heat treatment at 900 °C for...