共查询到19条相似文献,搜索用时 171 毫秒
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用搅拌磨制备超细粉体的试验研究 总被引:1,自引:0,他引:1
使用介质搅拌磨并以φ0.8~1.4mm氧化锆陶瓷微珠为研磨介质对水镁石、电气石、云母(包括白云母、金云母、绢云母)进行了超细粉碎试验。选择适宜的助磨剂、分散剂、料浆浓度、研磨时间等试验条件,得到了d50=0.78μm、d97=1.85μm的水镁石和d50=0.75μm、d97=1.07μm的电气石,以及d50=0.75μm、d97=1.93μm的云母超细粉体;而且物料的原有晶形在超细粉碎过程中得到了保护。 相似文献
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助磨剂对于粉体的超细粉碎起着重要的作用.本文对辉沸石的介质搅拌磨湿法超细研磨中三乙醇胺对超细粉碎的影响规律进行了研究.结果表明,三乙醇胺对辉沸石的超细粉碎效果影响明显,其最优用量为辉沸石0.4%;在球料比4:1、料浆浓度50%、三乙醇胺用量0.4%的条件下累积研磨3h,所得辉沸石样品粒度分布为d50=3.72μm,d97=9.48μm. 相似文献
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石墨超细粉碎探索性研究 总被引:2,自引:0,他引:2
详细介绍了我国石墨超细粉碎的发展现状及石墨超细粉碎设备的比较.通过具体试验,考察矿浆浓度、磨矿介质及介质的尺寸、助磨剂用量、球料比、搅拌器转速及磨矿时间等主要操作参数对石墨超细磨矿效果的影响,同时分析产生这些因素的原因,对今后石墨超细磨矿有很大的益处. 相似文献
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《Minerals Engineering》2003,16(3):273-281
The conversion of magnesium fluoride to magnesium hydroxide was studied as part of a process to bleed magnesium from zinc sulphate electrolyte. Most electrolytic zinc plants have to deal with accumulating magnesium in their process liquors as the natural magnesium bleed usually does not balance input from concentrates. The most common forced magnesium bleed produces large amounts of waste gypsum and could potentially be environmentally unfriendly. An alternative process was suggested and discussed, which involves magnesium fluoride precipitation from zinc electrolyte. The magnesium fluoride is converted to magnesium hydroxide in order to produce a saleable product. Regeneration of chemicals from the resulting sodium fluoride solution can be accomplished by means of an electro-dialysis process. Previous experiments indicated a relatively high residual fluoride content in the conversion product, which might limit the application possibilities of the magnesium hydroxide. From the experiments described in this paper it followed that it is not possible to reduce the residual fluoride content of the magnesium hydroxide product to <1 wt.% by optimising operating conditions such as leach concentration, reaction temperature, reaction time and wash procedures. From X-ray diffraction analysis, it was deduced that the residual fluoride was incorporated into the brucite crystal structure. Therefore, the sharp conversion of magnesium fluoride to magnesium hydroxide, derived from thermodynamic analysis, is in practice not entirely valid. It is possible to reduce the fluoride content of the product by burning the (fluoride containing) magnesium hydroxide to magnesium oxide (with <1 wt.% F) at temperatures of >1273 K. Thus a saleable product could be obtained. 相似文献
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氢氧化镁晶须制备研究 总被引:11,自引:0,他引:11
本文以碱式硫酸镁晶须和氢氧化钠为原料,研究了水热合成法制备氢氧化镁晶须的合理工艺条件。结果表明:当碱式硫酸镁晶须料浆浓度(质量分数)为4.0%,搅拌强度为100r/min,反应温度为180℃,反应时间为4h时,可合成直径≤0.5μm、长径比≥15、表面光滑、纤细均匀、高纯度的氢氧化镁晶须。 相似文献
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超细电气石粉体的制备和负离子释放性能研究 总被引:12,自引:1,他引:12
电气石是一种以含硼为特征、化学组成复杂的环状结构的硅酸盐矿物。超细电气石是一种具有健康和环保功能的粉体材料。本文使用介质搅拌磨对电气石粉进行了超细粉碎实验室试验研究和中试,并对试验样品进行了粒度检测、扫描电镜(SEM)分析以及负离子释放性能检测。结果表明,制取的超细电气石粉体的粒度及其分布为d50≤0 8μm、d97≤2 0μm,颗粒形状规则,静态平均负离子释放率达到4225ions/cm3,为原料的2~3倍。 相似文献
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针对方铅矿单矿物,分别使用瓷罐瓷球与瓷罐铁球磨矿并进行浮选,考察磨矿时间、矿浆溶液的酸碱度、捕收剂的用量与方铅矿浮选效果的关系。结果表明,瓷介质磨矿比铁介质磨矿更有利于方铅矿的浮选;高碱环境有利于方铅矿的浮选;捕收剂用量越高越有利于方铅矿的浮选;采用铁介质磨矿时,磨矿时间延长,方铅矿浮选回收率降低,而采用瓷介质磨矿,磨矿时间对其影响不大;采用铁介质磨矿,铁介质氧化生成羟基氧化铁覆盖在方铅矿表面,改变了方铅矿表面组成,增加了方铅矿亲水性,对方铅矿的浮选产生负面影响。 相似文献
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针对四川某锂辉石矿,在浮选入料粒度为-0.075 mm粒级占70%的前提下,系统研究了磨矿浓度、磨矿时间、介质充填率、钢球配比、药剂作用及磨矿介质类型等参数对锂辉石最佳浮选粒级(-0.106+0.038 mm)分布及品位的影响。实验室试验结果表明,通过调整磨矿浓度、介质充填率和钢球配比等参数,可有效提高-0.106+0.038 mm粒级含量和磨矿技术效率。在此基础上,添加碳酸钠可改善磨矿过程中矿浆的流变性,碳酸钠用量为800 g/t时,能进一步提高-0.106+0.038 mm粒级产率。在-0.075 mm粒级占70%条件下,球磨和棒磨获得的-0.106+0.038 mm粒级含量相近,但球磨产品中该粒级Li2O品位更高,选择性磨矿作用更好。优化球磨参数后,锂辉石回收率可达95.92%,精矿品位为4.84%。 相似文献
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《Minerals Engineering》2007,20(7):701-709
The influences of wet ultra-fine grinding parameters on the rheological behavior of pyrite–heptane slurry in a laboratory stirred media mill were investigated with solid concentration, dispersant dosage, grinding time and carbon numbers of organic acid as dispersant. The results reveal that when the solids concentration is increased from 64 wt% to 79 wt%, the rheological behavior of slurry with 1 wt% of stearic acid transforms from Bingham characteristic to the pseudoplastic one with a yield stress. The Casson model fits well for the experimental data. And the apparent viscosity of the pyrite–heptane slurry increases exponentially with increase solid concentration at a given shear rate. The increase of viscosity is propitious to reduce the particle size of pyrite. When the solid concentration is 64 wt%, stearic acid is superior to octadecanol for the reduction of the slurry viscosity, and the slurry with 1 wt% of stearic acid possesses the best flowability. The extrapolated Bingham yield stress with dispersant almost stays constant when the dosage is over 2 wt%. Besides, the rheological behavior and particle size are also related to the grinding time and carbon numbers of organic acids as dispersant. 相似文献
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为阐明EDTA在生石膏超细磨过程中的作用机理,采用黏度、XRD、XPS和红外光谱等方法表征生石膏料浆及超细磨产品。结果表明,在排矿口宽度为12 mm、料浆浓度为20%和超细磨时间为15 min的条件下,质量分数0.40%的EDTA可有效强化生石膏晶格应变效应和晶粒细化效应,减小生石膏的结晶度和粒度,使其d 50由42.43 μm减小为16.69 μm。EDTA与生石膏表面的Ca2+生成Ca(COO)2,并覆盖其表面的羟基化活性点Ca2+导致ζ电位负向增大,进而减少了生石膏表面的吸附水相对含量及颗粒间的黏结力。上述作用既增强了生石膏颗粒间的排斥作用能使其形成稳定的分散体系,还可使生石膏料浆的浊度增大27.78%,而黏度减小18.16%,最终提高了生石膏的超细磨矿效果。 相似文献
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用失重法对泵轮叶片的磨损进行了试验。根据试验结果讨论了叶片设计参数、叶轮转速和固体浓度与叶片磨损之间的关系,其研究结果对高效、耐磨渣浆泵设计有指导意义。 相似文献