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of Electromechanical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China; 3. Zhejiang Dunan Light Alloy Technology Co., Ltd., Zhuji 311835, China) Abstract: The calcium phosphate coatings were prepared by micro arc oxidation (MAO) technique on Mg-1.0Ca alloys in an alkaline solution containing sodium phytate and calcium carbonate. The surface morphology, chemical compositions......
偶氮氯膦Ⅲ分光光度法测定硅铁中钙钟国秀1,黄清华2,杨浩义1(1.湖北省武汉市湖北省机电研究设计院2.湖北省建材研究设计院,湖北武汉 430071)摘 要:研究了偶氮氯膦Ⅲ与钙的显色反应,建立了测定硅铁中钙含量的分光光度分析方法.试验并确定了最佳反应条件,结果表明:在pH 10.0的NH3·H2O-NH4Cl缓冲介质中,钙与偶氮氯膦Ⅲ形成绿色络合物,在波长672 nm处有最大吸收,且显色程度与钙浓度成正比.钙质量浓度在0.072~1.00μg/mL范围内符合比尔定律,方法的检出限为0.022μg/mL.在加入掩......
is related with calcium sulphate and iron precipitation. In the residues calcium content is essentially the same, but the sulfur content evidently increases and gypsum is found, calcium and iron on the surface evidently increase, calcium sulphate crystallizes and iron precipitates on the ore surface, which worsen the penetrability of the ore and result in gradually dropping of copper leaching rate......
Trans. Nonferrous Met. Soc. China 26(2016) 2230-2237 Synthesis of phosphate-embedded calcium alginate beads for Pb(II) and Cd(II) sorption and immobilization in aqueous solutions Yun-yan WANG1,2, Wen... calcium alginate beads were successfully synthesized based on sodium alginate, calcium dihydrogen phosphate and sodium hydrogen carbonate. Scanning electron microscopy, Fourier transformed infrared......
Calcium Hydroxytitanate in Bayer Digestion ProcessGu Songqing Zhengzhou Light Metal Research Institute Cao Rongjiang General Research Institute for Non-ferrous Metals,Beijing Chen Xinmin Central South University of Technology,Changsha摘 要:<正> Calcium hydroxytitanate formed in Bayer digestion process of chinese diasporic bauxite......
Effect of Na2O on alumina leaching property and phase transformation of MgO-containing calcium aluminate slags WANG Bo, SUN Hui-lan, GUO Dong, ZHANG Xue-zheng School of Materials Science and Technology, Hebei University of Science and Technology,Shijiazhuang 050018, China Received 13 December 2010; accepted 23 May 2011 Abstract: In order to remove or reduce the negative effect of MgO in calcium......
; 文献标志码:A Effects of calcium salts and KOH concentrations on surface morphology and chemical compositions of micro arc oxidation coatings on titanium alloys QIAO Li-ping1, JIANG Long-fa2, HUANG... University, Nanchang 330013, China) Abstract: Five kinds of calcium salts, such as Ca(CH3COO)2, CaO, Ca(H2PO4)2, C3H7CaO6P, EDTA-Ca and KOH, were separately added into a base solution of 15 g/L as food......
the separation amount of Al and Si from solution. The concentration of K2CO3 in solution has no obvious effect on the separate reaction. Key words: potassium dichromate; cleaner production; calcium oxide..., 2003, 3: 19-21.LIU Lian-li, ZHAI Yu-chun, TIAN Yan-wen. Property study of hexagonal calcium aluminate hydrate[J]. Light Metals, 2003, 3: 19-21. [12] 刘连利, 翟玉春, 田彦文, 王雅静, 韩跃新. 水合硫铝酸钙的合成[J]. 中国有色金属学报......
然为12CaO·7Al2O3；当熔分温度为1600 ℃时部分12CaO·7Al2O3向3CaO·Al2O3(C3A)转化,3CaO·Al2O3含量有所提高. 图3 不同熔分还原温度下铝酸钙渣XRD谱 Fig. 3 XRD patterns of calcium aluminate slag at different melting reduction...显降低.当熔分温度由1450 ℃继续升高时,得到的铝酸钙渣浸出性能急剧恶化,这是由于在升温过程中部分12CaO·7Al2O向3CaO·Al2O3转化造成的. 图4 不同熔分温度下铁相与铝酸钙渣形貌 Fig. 4 Morphologies of iron and calcium aluminate slag at different melting reduction......
铝镇静钢夹杂物形态控制工艺研究姚同路1,刘浏1,李树庆2,吴波2,王宝明2,王永然2(1.北京市钢铁研究总院冶金工艺研究所2.天津钢铁集团有限公司,天津 300301)摘 要:通过热力学分析结合现场试验,采用金相分析,扫描电镜,能谱分析等方法,研究了铝镇静钢中氧化物夹杂的变性处理工艺.热力学计算结果表明,当钢中的[Al]s质量分数为0.025%,钙处理时控制钢中钙质量分数高于22×10-6,硫质量分数低于0.008%时,可较容易地将Al2O3夹杂变性为低熔点的C12A7.对天津钢厂生产石油套管钢的LF精炼工艺进......
