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。     

Approaches to High-grade Sintered Magnesia from Natural Magnesite

It is hard to manufacture high purity,dense sintered-magnesia from natural magnesite in the prevailing process of calcining and sintering,for two reasons: a) im...     

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...     

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.     

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。     

高掺量赤泥-粉煤灰微晶玻璃研究

赤泥是氧化铝生产中排放的碱性废渣,粉煤灰是燃煤电厂排放的高SiO2含量废渣.综合利用两种废渣制备高性能的微晶玻璃材料,控制SiO2含量在31%～44%,CaO含量在25%～31%,两种废渣总吃渣量能够达到90wt%以上,具有显著经济效益和环境效益.     

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...     

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.     

用工业废渣赤泥研制微晶玻璃

本研究利用山东铝业公司固体废弃物赤泥、粉煤灰、煤矸石等为主要原料,制备了装饰材料用微晶玻璃。探讨了微晶玻璃的热处理工艺制度及晶核剂对核化、晶化的影响。采用TG-DTA、XRD、SEM等测试技术测试了样品的理化性能和微观结构。     

由菱镁矿制备高纯纳米氧化镁的新工艺

以菱镁矿、工业级硫酸铵和碳酸铵为原料,采用复配的表面改性剂,用液相沉淀法制备高纯纳米氧化铗粉体。在优化工艺条件下,制得平均粒径为65nm、纯度超过99．5％的纳米氧化镁粉体,产品粒径分布较窄,分散性良好。该工艺过程简单,产品质量稳定,适宜于工业化生产。