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考察了乙基黄药为捕收剂时,脆硫锑铅矿的浮选行为,发现在pH2 ̄12的范围内,脆硫锑铅矿均可表现良好的可浮性,只有pH>12时,可浮性下降。通过用氧化剂过硫酸铵、还原剂硫代硫酸钠调节矿浆电位,考察了脆硫锑铅矿在不同pH值下,可浮性与矿浆电位的关系,得出了矿物可浮的电位-pH区间。并通过红外光谱测试的研究,探讨了乙基黄药在脆硫锑铅矿表面作用机理及生成产物,不同pH值及不同电位下与乙基黄药作用后,脆硫锑铅矿浮选回收率与红外吸收强度有一定的对应关系,在弱酸性范围,红外信号最强。乙基黄药在脆硫锑铅矿表面作用主要生成物为黄原酸铅。 相似文献
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对 5种国内外洗衣机内桶专用树脂进行了序列结构分析 (用核磁共振波谱NMR)、热性能测定 (用差示扫描量热法DSC)、相对分子质量及其分布测定 (用凝胶渗透色谱法GPC)和力学性能测定。比较了它们的差别并讨论了造成这些差别的因素 相似文献
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声波透射法在灌注桩的桩身结构完整性检测中得到了广泛的应用,但是规范推荐的数据分析方法存在诸多局限l生,易造成误判或漏判。对其他数据分析方法进行了综述,同时提出一种新方法,可为相关人员提供参考。 相似文献
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The effect of hydroxamic acid starch (HAS) and hydroxamic acid polyacrylamide (HPAM) on the flotation of diaspore and kaolinite was investigated by flotation test. It is found that HAS depresses diaspore but activates kaolinite in acidic pulp,while HPAM activates both diaspore and kaolinite in the pH range of 2.0 - 10.5. The measurement of zeta potential shows that both HAS and HPAM can increase zeta potential of negatively charged diaspore, which indicates the existence of chemical bonding or hydrogen bonding between the reagents and diaspore.By covering the collector dodecyl amine(DDA) on diaspore surface, HAS increases the hydrophilicity of minerals and depresses the flotation of diaspore,however HPAM activates the flotation of diaspore by increasing the adsorption of DDA on diaspore surface. 相似文献
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论英语的情态表达方式 总被引:1,自引:0,他引:1
徐兢 《河南机电高等专科学校学报》2002,10(1):77-78
情态是语言人际功能中的重要组成部分。该文以Halliday的情态概念为出发点,首先分析了情态的类别和情态隐喻,接着探讨了情态表达的主/客观取向,最后总结了情态的表达方式及其应用。 相似文献
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γ-alkoxy-propylamines, C12 H25 O(CH2 )3 NH2, C14 H29 O(CH2)3 NH2, C16 H33 O(CH2)3 NH2, C18 H37 O-(CH2)3NH2 were synthesized from aliphatic alcohol and acrylonitrile. The flotation tests of kaolinite, pyrophyllite and illite were conducted. The flotation mechanisms were explained in view of the structures of reagents and alumin ium silicate minerals, zeta potential and Fourier transform infrared spectrum measurements. The results show that the synthesized r-alkoxy-propylamines are more effective than dodecyl amine for flotation of kaolinite, pyrophyllite and illite. For flotation kaolinite and illite, the collecting ability is in the order of C18 H37 O(CH2)3 NH2 >C16 H33O(CH2)3 NH2 >C14 H29O(CH2 )3 NH2 >C12 H25O(CH2)3 NH2, but the r-alkoxy-propylamines types of collectors have almost the same collecting ability on pyrophyllite,which demonstrating that γ-alkoxy-propylamines are new selective collectors for reverse floatation to remove aluminium silicate minerals from bauxite. 相似文献