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《Ceramics International》2022,48(20):29882-29891
A simple strategy for preparing MgO–Al2O3–CaO-based porous ceramics (MACPC) with high strength and ultralow thermal conductivity has been proposed in this work based on the raw material of phosphorus tailings. The effects of phosphorus tailings content, carbon black addition and heat treatment temperature on the properties of MACPC were studied, and their pore-forming mechanism during sintering was revealed. The results showed that the main phase composition of MACPC was magnesia alumina spinel and calcium aluminate after sintering at 1225 °C. Furthermore, the MACPC exhibited excellent comprehensive properties when 60 wt% phosphorus tailings and 40 wt% alumina were added, whose apparent porosity was 62.8%, cold compressive strength was 14.8 MPa, and the thermal conductivity was 0.106 W/(m·K) at 800 °C. The synchronously enhanced strength and thermal insulation properties of MACPC were related to the formation of uniformly distributed micropores (<2 μm) and passages in the matrix, which originated from the decomposition of phosphorus tailings and the burnt out of carbon black during the sintering process. The preparation of MACPC with high temperature resistance and excellent mechanical and thermal insulation properties with the raw material of phosphorus tailings provided an effective method for the high-value utilization of phosphorus tailings. 相似文献
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某胶磷矿选厂入磨原矿中-0.074 mm粒级含量7.05%,这部分矿石一方面影响磨矿分级效果,另一方面影响浮选效果。为解决该问题进行了预选脱泥,即-0.074 mm粒级矿样直接浮选,而对+0.074 mm粒级矿样进行磨矿-浮选,结果表明,与原矿直接磨矿-浮选相比,脱泥磨矿效果可以提升8.90%,脱泥浮选产率提高了0.46个百分点,回收率提高了3.37个百分点,调整剂用量下降了0.64%,捕收剂用量下降了9.75%。 相似文献
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熔融制样-X射线荧光光谱法测定蛇纹石中主次组分 总被引:2,自引:0,他引:2
针对蛇纹石主次组分同时测定中存在的问题,实验以Li2B4O7-LiBO2(m:m=33:67)为熔剂,碘化铵和溴化铵做脱模剂,熔融法制备样品,建立了X射线荧光光谱法(XRF)测定蛇纹石中SiO2、MgO、Fe2O3、Al2O3、CaO等主次成分的方法。优化后的熔融条件如下:稀释比为10:1,加入4 滴400 g/L NH4Br溶液和14 滴400 g/L NH4I溶液做脱模剂,在700 ℃预氧化4 min,再升温到1 050 ℃熔融6 min。选择与蛇纹石矿物相似的滑石、水镁石、非金属矿石物化性能和化学成分分析国家标准物质进行互配,采用基本参数法校正基体效应后,建立校准曲线,解决了蛇纹石标准物质缺失的问题。方法的检出限为80~170 μg/g。对1个东海蛇纹石样品进行精密度考察,测定结果的相对标准偏差(RSD,n=10)均不大于0.70%;采用实验方法对两个蛇纹石样品进行分析,并与行业标准方法HG/T 3575—2006测定结果进行对照,结果相符。 相似文献
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大型数控龙门式加工中心,主要用于国防军工、航空航天、大型汽车模具加工等行业,属于技术含量和附加值很高的大型精密机床。本文主要介绍本产品在关键结构及机床工艺等方面的创新设计。项目的研究开发,突破了西方工业发达国家对大型数控龙门式加工中心技术的垄断和限制,促进机床行业的产品升级换代并带动了行业技术的进步。 相似文献
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对云南中低品位磷矿选矿的认识和建议 总被引:3,自引:0,他引:3
在磷精矿的富集中,提出了:中低品位胶磷矿浮选精矿品位富集与镁、硅及其他杂质脱除存在数量关系β=α+1.3×k1+0.42×k2+1.5%。 相似文献