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J. Cent. South Univ. (2016) 23: 529-534 DOI: 10.1007/s11771-016-3099-8 Effect and mechanism of dolomite with different size fractions on hematite flotation using sodium oleate as collector LUO Xi... and Springer-Verlag Berlin Heidelberg 2016 Abstract: The effect of dolomite with different particle size fractions on hematite flotation was studied using sodium oleate as collector at pH of about 9......
Berlin Heidelberg 2016 Abstract: Hydration grossular and hematite monominerals were synthesized. The effects of dissolved organic compounds (including sodium formate, sodium acetate, sodium oxalate, sodium salicylate or disodium phthalate) on the settling performance of hydration grossular or hematite slurries were studied. The settling of the slurries was also investigated with the addition of sodium......
: The flotation of pure and natural carbonaceous iron ore samples in the oleate flotation system was investigated. Starch can depress hematite effectively in a wide pH range, but cannot depress siderite efficiently in neutral conditions. The flotation recovery of pure hematite, siderite, and quartz in the oleate-starch-CaCl2 system is significantly different when the slurry pH varies from 4 to 12......
.赤铁矿理论上化学组成为Fe 69.94%,O 30.06%(质量分数).主要考虑α-Fe2O3晶体,其晶格参数为a=b=c=5.42 ,α=β=γ=55.36°,晶体空间点群呈167 R-3C对称,建立后的晶体模型如图1所示. 图1 赤铁矿晶体模型 Fig. 1 Crystal model of hematite 1.3 吸附能计算 淀粉抑制剂,水分子及氢氧...理面对晶面原子的态密度的影响如图4所示. 通过图4可以看出,赤铁矿(001)解理面上的O原子和Fe原子偏态密度与矿物晶体结构中的O原子和Fe原子偏态密度相比,都有所变化,这说明矿物在解理时,矿物表面化学键发生了断裂,从而导致晶面原子性质的细微变化,这也是矿物表面活性中心形成的实质. 图2 赤铁矿的能带结构 Fig. 2 Band structure of hematite......
; 文献标志码:A Adsorption mechanisms of sodium oleate on surfaces of hematite and apatite FENG Qi-ming, ZHAO Yan-sen, ZHANG Guo-fan (School of Mineral Processing and Bioengineering, Central South University, Changsha 410083, China) Abstract: The flotation of hematite and apatite using sodium oleate as collector......
,可确定该物质为铁矾. 图5 赤铁矿渣中S的XPS谱 Fig. 5 XPS spectra of S in hematite precipitates 2.3 晶种浓度的影响 高温(200 ℃)虽更有利于赤铁矿的形成,促使铁矾溶解并最终转化成赤铁矿.但温度过高会使企业的经济成本增加,不利于赤铁矿技术推广及应用.为在较低温度(180 ℃)下获得纯净赤铁矿,研究了晶...光谱分析,结果如图12所示. 图12 200 ℃时赤铁矿渣的红外光谱图 Fig. 12 FT-IR spectra of hematite precipitates obtained at 200 ℃ 在900~1300 cm-1范围内的3个红外波段是SO42-的震动吸收峰,其对应着S-O键的拉伸震动.随着反应时间的延长,3个波段的透过率明显减弱,说明SO42-在渣中的吸......
Trans. Nonferrous Met. Soc. China 27(2017) 2715-2726 Transformation of hematite in diasporic bauxite during reductive Bayer digestion and recovery of iron Xiao-bin LI, Yi-lin WANG, Qiu-sheng ZHOU...: The reductive Bayer digestion by using iron powder as reductant is proposed to convert hematite to magnetite and further to dissociate iron minerals from sodium aluminosilicate hydrate (desilication......
University, Shenyang 110004, China Received 19 August 2010; accepted 29 November 2010 Abstract: The collecting performances of N-dodecylethylene-diamine (ND) to quartz and hematite were studied via single mineral flotation. Experimental results show that ND has stronger collecting ability to quartz than hematite. Different floatability of quartz and hematite was presented in the existence......
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