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氟化钙     
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  calcium fluoride
     The wetting and chemical action of molten calcium fluoride and five fluoridecontaining slags with various basicity (1.5~3.2) and fluoride content (10~24% F) on carbon refractories at 1400℃ was studied.
     研究了氟化钙及不同硷度(1.5~3.2)、氖含量(10~24%F)的五种含氟高炉渣对于炭素耐火材料的化学、润湿作用(1400℃)。
短句来源
     The influence of calcium fluoride(CaF2),temperature and liquid phase(C4AF is selected in the paper) on the mineral formation of tri-calcium silicate(C3S) and Ba-bearing calcium sulphoaluminate(CBAS,the chemical measure is selected as 2.75CaO·1.25BaO·3Al2O3·SO3,which shortening is C2.75B1.25A3) in several systems is studied.
     以纯化学试剂配料,研究了微量元素氟化钙(CaF2)、温度以及液相(本文取铁铝酸四钙)等不同条件下对硅酸三钙(C3S)和硫铝酸钡钙(CBAS,本文取化学计量为2.75CaO.1.25BaO.3Al2O3.SO3,简写为C2.75B1.25A3S)矿物形成及共存的影响。
短句来源
     Through the postmortem examination of the samples with special precaution, neither solid solutions of calcium fluoride and alumina (Pascal) nor the compounds CaAl_2O_3F_2 and CaAl_(10)O_(15)F_2 (Gunther et al.) were verified.
     氟化钙与氧化铝的固溶体(Pascal)以及CaAl_2O_3F_2与CaAl_(10)O_(15)F_2化合物(Günther等)在本工作中均未能证实。
短句来源
     Conclusions:10% strontium chloride, 5% potassium nitrate, 6% sodium fluoride and 6% calcium fluoride solution,and 40% formalin are efficient in the treatment of dentin hypersensitivity.
     结论 :10 %氯化锶、5 %硝酸钾、6 %氟化钠与 6 %氟化钙混合溶液和 4 0 %甲醛可以有效治疗牙本质过敏
短句来源
     Results:10% strontium chloride,5% potassium nitrate, 6% sodium fluoride and 6% calcium fluoride solution,and 40% formalin significantly reduced dentin hypersensitivity ( P <0.05), whereas 6% sodium fluoride and 6% calcium fluoride solution achieved the best effect ( P <0.05).
     结果 :10 %氯化锶、5 %硝酸钾、6 %氟化钠与 6 %氟化钙混合溶液、4 0 %甲醛可明显降低牙本质过敏程度 ,而以 6 %氟化钠与 6 %氟化钙混合溶液的脱敏效果最好。
短句来源
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  calcium fluorate
     When HF leaks into the circulating water system, it will remarkably reduce pH value of circulating water. This will not only lead to severe corrosion of equipment but also block the heat exchanger equipment due to the fouling of calcium fluorate.
     当循环水系统漏入HF时 ,会使循环水的pH值明显降低 ,这不但会对设备造成严重腐蚀 ,而且会生成氟化钙垢堵塞换热设备。
短句来源
  calcium flouride
     Based on the Ferrite method for treating heavy metal wastewater,asystematic experimental study of ferrite coating membrane of ferrite sludge,neutralized precipitation sludge and calcium flouride sludge was done.
     本文在铁酸盐法(Ferrite)处理重金属离子废水的研究基础上,分别对铁酸盐渣、中和沉淀的氢氧化物渣和氟化钙沉淀渣上进行了铁酸盐包复膜的系统的实验研究。
短句来源
  “氟化钙”译为未确定词的双语例句
     Values of enthalpy changes, free energy changes and entropy changes in the reaction of the fluorite with sulfuric acid at 393. 15K and 553. 15K
     氟化钙与硫酸在393.15K和553.15K时的焓变,自由能变与熵变值
短句来源
     The dimension analysis of ladle furnace refining slag - CaO Al 2O 3 SiO 2 MgO CaF 2 series has been carried out, and based on the theoretical analysis and experimental results, the relation between foaming index and ingredient of free calcium fluride and low calcium fluride refining slag is obtained.
     对CaO Al2 O3 SiO2 MgO CaF2 系钢包炉精炼渣泡沫化的影响因素进行了因次分析 ,根据理论分析的结果和实验数据得到了无氟化钙和低氟化钙炉渣泡沫化指数与炉渣成分之间的关系式
短句来源
     The density and dynamic properties of epoxy composites filled by Al2O3, CaF2 and glass microbead were investigated.
     本文对氧化铝(Al_2O_3)、氟化钙(CaF_2)和玻璃微珠颗粒填充环氧基(E51环氧—胺固化体系)复合材料的密度和动态力学性能进行了研究。
短句来源
     The results showed that the four additives could greatly improve the content of cordierite,and the optimum adding quatities are as following:zirconium silicate 2wt%, barium carbonate 3wt%,sillimanite 2wt%,fluorite 2wt%.
     结果表明:四种添加剂的加入均提高了堇青石的含量,且加入量都有一最佳值,分别为锆英砂2wt%、碳酸钡3wt%、硅线石2wt%、氟化钙2wt%。
短句来源
     The equilibrium distribution ratios of Nb and Ta, namely L_Nb and L_Ta, seem to be substantially independent of both the basicity and the CaF_2 contents in slag, but markedly affected by the reaction temperature.
     炉渣碱度和炉渣中之氟化钙含量对铌、钽在渣铁间的平衡分配比值L_(Nb)及L_(Ta)均无明显影响,反应温度对L_(No)及L_(Ta)值影响甚大.
短句来源
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  calcium fluoride
The optical properties of high-porosity calcium fluoride ceramics
      
The effective absorption coefficient and the radiation diffusion coefficient are determined for high-porosity calcium fluoride ceramics.
      
The films were deposited onto crystal calcium fluoride substrates by the method of high-frequency cathode sputtering.
      
Photothermochemical conversion of simple color centers (which include from one to four anionic vacancies) and highly aggregated ones in additively colored crystals of calcium fluoride doped by sodium is studied.
      
The mechanisms of formation and erasure of holographic gratings recorded in calcium fluoride crystals with a low sodium content have been considered.
      
更多          
  calcium flouride
Microstructural characterization of calcium flouride single crystals deformed in steady state
      
Microstructural characterization of calcium flouride single crystals deformed in steady state
      
Tunable 4He Third-Sound Index of Refraction Using Patterned Calcium Flouride
      
  calcium fluorides
Structure of the short-lived absorption and luminescence spectra of barium and calcium fluorides accompanying pulsed electron ir
      
Examples of applications are given to the determination of the composition of various thin films of aluminium and silicon oxides, silicon nitrides and calcium fluorides.
      
Reaction of fluorine with alkali metal salts of dinitroacetonitrile in presence of potassium or calcium fluorides
      


During the smelting of an iron ore containing high fluoride content in a small blast furnace, the hearth refractories were severely corroded. This can be ascribed to the action of very fluid fluoride-containing slags.Moreover, the products of corrosion reactions also have low viscosity which easily flow away from the working face, and leave a new surface fresh for further attack.The stack lining with the same 45%-Al_2O_3 blast furnace brick was, however, in fairly good condition. The chemical analyses of the...

During the smelting of an iron ore containing high fluoride content in a small blast furnace, the hearth refractories were severely corroded. This can be ascribed to the action of very fluid fluoride-containing slags.Moreover, the products of corrosion reactions also have low viscosity which easily flow away from the working face, and leave a new surface fresh for further attack.The stack lining with the same 45%-Al_2O_3 blast furnace brick was, however, in fairly good condition. The chemical analyses of the inner surface of the brick samples show a high percentage of alkali-,alkaline earth-and fluoride-ion contents. But as the amount of melt formed at the temperatures on these zones is comparatively little, that corrosion is not severe.Minerals identified at the stack lining surface consist of: fluorite, fluoro-biotite, kaliophilitenephelite, leucite, cuspidine and spinels etc. This is the first time that mica minerals have ever been identified in blast furnace linings. It is thought that the formation of fluoro-biotite has fixed a part of the F~-, K~+ or Ca~(2+)-ions, which would otherwise go into the melt. Thus its formation actually exerts some protective action against the corrosion of the stack lining.The higher temperatures prevailing in the bosh region in contrast to the stack caused the formation of a much larger amount of fluoride-containing melt, which is probably responsible for the remarkable degree of Corrosion on the bosh refractories.High temperature experiments carried out in the laboratory on the reactions betwccn CaF_2 and 45%-Al_2O_3 brick powder in closed graphite crucibles throw light to explain the process of corrosion of the furnace lining. Hexagonal anorthite was identified in all of these experimtnts, which has identical optical properties and X-ray diffraction patterns with those of hexagonal anorthite synthesized in our laboratory. It is also interesting to note that these hexagonal anorthites change over to normal triclinic modification under heat treatment at 1000℃ for a period of 24 hours.As a result of this and other previous studies in this laboratory, the appropriate selection of refractory materials for the lining of blast furnaces, smelting iron (?)e containing high fluoride content, is recommended.

在某地高氟含量铁矿石的冶炼过程中,炉缸粘土质高炉砖砖视遭到了极其严重的破坏作用。主要侵蚀介质是含氟炉渣,侵蚀产物容易从砖面流失,因而加速了耐火材料的溶解。在炉身部位发现的矿物是:氟化钙、含氟黑云母、钾和钠的铝矽酸盐、枪晶石及尖晶石等。虽然在砖面附着物中包含着相当数量的氟、硷金属及硷土金属的化合物,但是由于温度较低,只有少量熔体出现,砖衬的损毁情况,并不严重。在高炉砖衬中发现云母矿物,还是第一次。在炉身部位的温度条件下,含氟黑云母具有固定F~-,K~+成Ca~(+2)的能力,对砖机起了保护作用。由于炉腹部位的温度较高,较大量含氟熔体出现,侵蚀就相当显著了。 CaF_2—45%Al_2O_3高炉砖的化学反应实验,可以帮助了解高炉砖视的损毁过程。反应产物中发现有六方钙长石,与实验室合成的六方钙长石具有一致的光学性质和X—射线粉末衍射图型。经过1000℃,24小时热处理后,这种六方钙长石会转变成为三斜晶系变体。 根据两个高炉砖衬的化学-矿物学研究及实验室中辅助研究的结果,对于冶炼高氟含量矿石的高炉砖衬的选择提出了建议。

The effects of fluorine on such properties as viscosity,melting point and desul-furization power of liquid blast-furnace-type slags have been studied.Both syntheticslags and slags obtained from crucible smelting of Pao-Tou ore were used.The syn-thetic slags were of the CaO-MgO-SiO_2-Al_2O_3 type,containing varying amounts ofCaF_2,while the slags from smelting contained in addition a small amount of the oxidesof rare metals.In has been found that fluorine has the effects of lowering the viscosity,lower-ing the...

The effects of fluorine on such properties as viscosity,melting point and desul-furization power of liquid blast-furnace-type slags have been studied.Both syntheticslags and slags obtained from crucible smelting of Pao-Tou ore were used.The syn-thetic slags were of the CaO-MgO-SiO_2-Al_2O_3 type,containing varying amounts ofCaF_2,while the slags from smelting contained in addition a small amount of the oxidesof rare metals.In has been found that fluorine has the effects of lowering the viscosity,lower-ing the melting point and mineralizing the glassy constituents of slags.The resultsof this study are shown as iso-viscosity and iso-melting-point curves on separate com-position diagrams.On the other hand,it seems that fluorine has little effect on theequilibrium sulfur-distribution-ratio between slags and metal,provided that CaF_2 isconsidered as neutral in calculating the basicity ratio.There is some indication,however,that fluorine might cause a slight decrease in the desulfurization power ofbasic slags.Further work is underway at this Institute in order to establish the roleof fluorine and rare metal oxides as far as desulfurization is concerned.The above-mentioned experimental findings are briefly discussed from a pointof view of the ionic constitution of slags.

在本文中,我们报告了含氟高炉型熔渣的的粘度、熔化性和脱疏力的研究结果。所用熔渣包括坩埚冶炼渣与合成渣,含氟化钙最高达40.7%。试验数据指出氟能显著地降低熔渣的粘度与熔化温度,但对硫在渣、铁间的平衡分配影响较小。因此作为初步估计,在计算硷度时可以将氟化钙视为中性。根据本文试验结果,我们从熔渣的离子结构观点讨论了氟影响熔渣性质的机理。

5 10 CaO-Al_2O_3-SiO_2-CaF_2.0%5% 10% CaF_2 50~70℃ 100~120℃~~

研究了四元系统CaO-Al_2O_3-SiO_2-CaF_2中5%、10% CaF_2(重量百分率)切面的相平衡关系,确定了各个化合物的原始相区域。 引入CaF_2后,未改变各个化合物的熔化性质,只是使它们原始相区的界线发生移动。没有新化合物出现,证实了莫来石的一致熔化性。 氟化钙的加入扩大了两液相共存的范围,利用电子显微镜能够更正确地测定其边界线。 加入5%、10% CaF_2,分别使CaO-Al_2O_3-SiO_2系统熔体的液相线温度降低50~70℃及100~120℃。

 
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