共查询到20条相似文献,搜索用时 78 毫秒
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本文分析了江西黑滑石中的铁对陶瓷白度的影响,并从混矿、加入NaCl、改变不同烧制工艺及磁选等方面分析对滑石增白的影响。 相似文献
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本文详细介绍了利用储量丰富的广丰黑滑石,不经煅烧,直接采用生料配料低温烧成的路线,研制出雪白如玉,氧化、还原气氛烧成均适宜的滑石细瓷,为一次烧成滑石瓷开创了一条新路子,并具有较大的经济优势和竞争能力. 相似文献
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现有的低品质叶蜡石矿石中含有较大量的铁杂质,白度低,因此其应用受到了很大限制.常见的非金属矿的增白方法有物理磁选方法、酸洗法、煅烧法、还原法等,这些增白方法由于叶蜡石的特殊结构而对叶蜡石并不完全适用.针对叶蜡石的结构特点,研究在煅烧法和酸洗法的基础上,开发出了一种新的增白方法:煅烧-酸洗技术.利用这种方法对叶蜡石原矿进行除铁增白处理,成功地将白度为71%的叶蜡石原矿粉提高到90%以上,得到了高品质的叶蜡石粉.实验还进一步研究了煅烧温度、酸液质量分数和酸洗温度对叶蜡石白度的影响,得出了最佳工艺条件:煅烧时间为2 h,煅烧温度为700℃,酸液质量分数为20%,酸洗时间为2 h,酸洗温度为70~80℃. 相似文献
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皮肤黑素成因分析与美白祛斑功效评价体系的研究 总被引:1,自引:0,他引:1
本文探讨了皮肤黑素细胞的生成与代谢、阻止黑素生物合成的关键因素,通过测定AA2G等几种典型美白剂对酪氨酸酶活性的抑制率建立了美白砝斑效果的功效评价体系。实验表明甘草等天然成份也有很好的美白祛斑效果。同时开展了高效安全的美白祛斑化妆品配方研究,产品有很好的市场前景。 相似文献
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采用单因素试验的方法,通过测定市场常见的皮肤美白剂对酪氨酸酶活性的体外抑制率。结果表明:体外美白效果最好的为光甘草定,其次是AA2G,再次为熊果苷,它们的美白功效均优于具有美白功效的植物提取液。同时,通过正交设计实验得到一种高效的皮肤美白剂复配组合,复配组合的皮肤美白剂添加量分别为:光甘草定0.05%,AA2G1%,烟酰胺1%,芦荟粉0.3%。此复配组合对酪氨酸酶活性的抑制率高达98.97%。由此得到的一款美白乳液,pH值为6.6,通过稳定性实验,其结果符合QB/T2286—1997。 相似文献
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Dominique Arrou Michel Baboulne 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1995,63(1):92-96
Certain amino acid derivatives (ε-basic, anilide group) can be readily adsorbed onto various types of talc (steopac, SS20, C300, C400). For instance, talc is capable of adsorbing the amino acid esters but not the equivalent free amino acids. The types of talc which have high hydrophobicity (00, 15M00) were poor adsorbents. Two applications of these findings are presented: enhancement of the sensitivity of enzymatic tests in the presence of chromogenic substrates and enantioselective separation of ε-basic amino acids (arginine, lysine, ornithine). 相似文献
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用0.2 mol/L的NaOH水溶液于80℃提取甘草的有效成分,对甘草美白润肤乳生产工艺中的不同乳化时间、乳化温度以及搅拌速度等条件进行优化,用正交实验优化单硬脂酸甘油酯、Span-80和Tween-80三种乳化剂的最优配比。结果表明,甘草美白润肤乳的最佳生产工艺条件为:乳化时间50 min,乳化温度85℃和搅拌速度300 r/min;3种乳化剂配比单硬脂酸甘油酯∶Span-80∶Tween-80的摩尔比为1∶1∶1.7。本研究配制的甘草美白乳的理化指标、感官指标、卫生指标中细菌总数等均符合国家标准。 相似文献
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天然滑石矿是多种矿物的集合体。原矿石可采用人工选矿进行提纯,但对于微粉颗粒人工选矿是无能为力的。利用滑石与伴生矿物杂质的物理性质的差异以及其在超细粉碎过程中不同的运动特性达到提纯的目的。得到的滑石,纯度明显提高,粒径分布窄,适宜作高档功能性粉体。 相似文献
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Laura Bueno Carlos Amador Serafim Bakalis 《American Institute of Chemical Engineers》2018,64(4):1305-1316
The adsorption of two widely used fluorescent whitening agents (FWAs) on unbrightened cotton fabrics has been investigated as a function of temperature, hardness of the wash liquor, initial concentration of FWA in solution, and fabric to wash liquor ratio. Sorption efficiencies of FWAs have been studied using a UV spectrophotometry technique. A mechanistic model has been developed to describe the dissolution process of FWAs, convective mass transport into the fabrics, diffusion in the stagnant layer to the fabrics' surface, and adsorption of FWAs on cotton fabrics. Dual porosity of the fabrics (inter‐yarn and intra‐yarn porosity) has been considered by allowing two different regions (outer and inner areas of the cotton fabrics) where FWAs molecules can diffuse and adsorb. Good agreement between experimental and predicted whiteness benefit by the proposed mathematical model has been observed for the range of variables considered. © The Authors AIChE Journal published by Wiley Periodicals, Inc. on behalf of 2017 American Institute of Chemical Engineers AIChE J, 64: 1305–1316, 2018 相似文献
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Xuebing Li Katsutoshi Nagaoka Laurent J. Simon Roberta Olindo Johannes A. Lercher 《Catalysis Letters》2007,113(1-2):34-40
Calcination parameters, such as atmosphere, duration and catalyst bed depth have a marked influence on the catalytic and spectroscopic
properties of sulfated zirconia. Sulfated zirconia calcined in nitrogen or synthetic airflow, in deep bed, exhibited comparable
activity in n-butane isomerization at 373 K, which suggests that oxygen is not necessary for formation of active sites. Catalysts calcined
in shallow bed are catalytically inactive. Thus, the bed depth is concluded to be crucial for the formation of active sites.
The samples calcined in shallow bed possessed lower sulfate content and the S=O stretching vibration was located at lower
frequency. Calcination in the presence of water vapor also led to lower catalytic activity, sulfate content, and BET area.
Extended calcination reduced gradually the activity and the sulfate content, which underlines the labile property of the active
sites. A new interpretation of the function of the calcination step is proposed and compared with models described in the
literature. 相似文献