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characterization Copper sulfate dropping test was considered as a practical method to evaluate the corrosion resistance of the coating because it can quickly reflect the grade of coatings by investigating the colour change of the drop, so it was utilized to optimize the added amount of cerous nitrate. The copper sulfate solution is a mixture of 50 g/L CuSO4·5H2O and 50 g/L NaCl in the presence......
for 24 h with distilled water under vigorous stirring. A stoichiometric amount of 2 mol/L calcium nitrate (Ca(NO3)2?4H2O)) dissolved in anhydrous ethanol was added into the hydrolysed phosphite sol which..., an amorphous calcium phosphate phase forms on the coated surfaces at first. This amorphous calcium phosphate phase grows gradually with the increase of soaking time and appeared granule morphology. After......
ultrasonically in acetone, activated with 10% HNO3 solution for 10 s, and dried using a drying apparatus. The electrolyte used for deposition of calcium phosphate was prepared by mixing a solution... with calcium phosphate, they were removed from the electrolytic solution, rinsed in distilled water and dried for about 4 h in air. Then, the as-deposited samples under optimum conditions of coating were......
). Several phases are not marked in the figure, such as lanarikite (Pb2(SO)4O), scotlandite (PbSO3), magnetite (Fe3O4), calcium chloride (CaCl2) and gypsum (CaSO4·2H2O), due to their relatively low... to the small particle size and high solubility of the potassium chloride. Additionally, the KCl liquor had a potassium ion concentration of 20.78 g/L, a calcium ion concentration of 3.14 g/L......
, an industrial waste, belongs to the siliceous material rich in clay minerals. It was composed of oxides and inorganic salts of silicon, calcium, aluminum, iron, magnesium, sulfur, sodium, potassium... As a powdery hydraulic gel material, cement generates calcium ions in the hydration process. The hydration products can strongly enhance the strength and water stability of soils. Ordinary Portland......
, resulting in PVC samples turn black quickly [44, 45]. In previous report, calcium stearate (CaSt2), also known as a metal soap, is generally employed as an auxiliary thermal stabilizer in conjunction... Materials The PVC resin (SG-5 type, suspension grade) was supplied by the chemical plant of Zhuzhou, China. The calcium nitrate (Ca(NO3)2), zinc nitrate hexahydrate (Zn(NO3)2·6H2O), aluminum nitrate......
of sodium sulfate and sodium carbonate on Al-Fe separation 2.2 硫酸钠和碳酸钠对还原球团微观结构的影响 高铝铁矿石铝铁分离效果除了受铁氧化物还原程度(即金属化率)的影响,还与还原后金属铁颗粒的大小及其与脉石成分的解离特性相关.为进一步确定硫酸钠和碳酸钠对高铝铁矿石还原焙烧过程中金属铁晶粒长大特性的影响,对硫酸钠和碳酸钠作用...酸钠在还原气氛下开始熔化的温度大约为750 ℃左右,相比于其在空气中的熔点(884 ℃)大约低130 ℃. 图5 还原气氛下硫酸钠熔融特性试验结果 Fig. 5 Melting results of sodium sulfate in reduction atmosphere 为确定硫酸钠还原焙烧产物的主要物相,对硫酸钠在750 ℃下还原焙烧的样品进行XRD分析,结果如图......
Na2SO4用量小于10%的情况.鉴于此,本实验中扩大Na2SO4用量范围从0%到20%,旨在系统研究Na2SO4用量对高铁低镍型红土镍矿还原焙烧选择性效果的影响,结果见图3. 从图3可以看出,Na2SO4对焙烧过程选择性效果的影响非常显著. 图3 Na2SO4用量对试样还原焙烧的影响 Fig. 3 Effect of sodium sulfate dosage on ore...行X射线衍射分析,结果如图4所示.比较发现,Na2SO4的加入对焙烧矿的矿物组成有明显的影响. 图4 不同Na2SO4用量焙烧矿的XRD谱 Fig. 4 XRD patterns of roasted ores with different sodium sulfate dosage 不加Na2SO4时,部分铁矿物被还原成金属铁,与还原出来的镍生成了镍含量较低的铁纹石,此乃该条件下镍铁......
) is unstable above 577 ℃ (it decomposes to form CaO and H2O), it may still be present at a higher temperature because it is soluble in calcium chloride. The calcined product can contain CaO and Ca(OH... in Asia [J]. Focus on Surfactants, 2008, 2008(2): 4. [5] GAO Can-zhu, DONG Yuan, ZHANG Hong-juan, ZHANG Jia-ming. Utilization of distiller waste and residual mother liquor to prepare precipitated calcium......
a higher corrosion resistance of the phosphate coating. ZHANG et al [14] studied the surface characterization of calcium phosphate coated magnesium alloy and found that a Ca–P coating could provide.... In addition, phytic acid is widely present in nature (plants, animals and soils), mainly as the calcium, magnesium and potassium mixed salts (also called phytines), and it has important biological......
