本文主要研究内容
作者程敏（2019）在《堇青石板式陶瓷膜微泡发生器的研究》一文中研究指出：气泡发生器是浮选柱的关键部件,它直接影响到气泡的大小和数密度,从而影响到浮选效率。目前传统的气泡发生器存在微孔易堵塞、发泡不均匀、操作流程复杂及能耗高等缺点,一度限制了气泡发生器的发展。利用多孔陶瓷膜发泡不仅操作简单、能耗低且其巨大的比表面积有利于大量微气泡的产生。堇青石由于具有原料价格低廉、耐腐蚀性能好、比表面积大、机械强度高等诸多优势,是一种性能优异的多孔陶瓷膜制备材料。因此本文以廉价的工业级堇青石粉为原料,采用“分步制备、整体组装、一次烧结”的方式制备了综合性能优异的新型陶瓷膜气泡发生器,通过改变气泡发生器的结构在一定程度上缓解了发泡不均及微孔易堵塞的问题。探讨了生坯的制备参数、气泡发生器的组装方法、造孔剂（种类/含量/粒径）、烧结温度、保温时间以及操作工况对气泡发生器性能的影响。并采用XRD、SEM、压汞测试分析技术及数码显微摄像技术对气泡发生器的断面形貌、物相组成、孔结构、孔径分布及气泡粒径分布进行了表征。具体结论如下:（1）探究了成型工艺、连接组装方案、造孔剂、烧结工艺等制备条件对发泡器性能的影响。加水量、干燥时间等成型条件的单因素实验结果表明,当加水量为40%、干燥温度为100℃,干燥时间为12 h,并在干燥2-3h时进行脱模,可制得结构完整的生坯组件。通过对比三种组装方案发现,将生坯组件单独制备,再用陶瓷浆料粘结组装,最后整体烧结的方式,可获得性能优异、气密性良好的气泡发生器。对比了添加不同造孔剂种类和含量的气泡发生器的综合性能,结果表明,添加碳粉,容易出现燃烧不完全的现象;添加淀粉,试样内部容易形成大量闭合气孔;而添加PS微球并且在添加量为10%时,材料内部能形成均匀的微孔结构,所产生的气泡尺寸较小且气泡数密度较高。考察了不同烧结温度和保温时间制备的气泡发生器的机械性能和发泡性能。结果表明,烧结温度对材料晶相结构影响显著,随烧结温度的增加,堇青石相的衍射峰先增大后减小并在1300℃时峰值达到最大。提高烧结温度及延长保温时间均能提高材料机械强度,但同时也会降低材料内部的微孔数量,导致微气泡数量减少。当烧结温度为1300℃、保温时间为1 h时,气泡发生的综合性能最优。（2）研究了单一粒径及复合粒径PS微球造孔剂对气泡发生器性能的影响,并探究了两种粒径类型的造孔剂对气泡发生器开孔率的影响机理。结果表明,添加单一粒径PS微球的试样,随造孔剂粒径的增加材料孔隙率增加,但当PS微球粒径超过10μm时,材料内部开始出现较多的大尺寸微孔,导致材料的抗压强度及耐碱腐蚀率大幅降低,产生气泡的平均直径增大且气泡分布均匀性变差。添加复合粒径PS微球试样的内部,孔棱上分布着更多微观小孔,这些微观小孔是造成材料孔隙率比添加单一粒径PS微球试样高的主要原因。此外,添加复合粒径PS微球试样的空气渗透速率也更高,发泡时材料受到的阻力更小,因此发泡性能更好。但是随着复合PS微球粒径的增大,试样抗压强度减小、耐碱腐蚀性变差、微孔孔径分布变宽、微气泡平均尺寸变大且分布均匀性变差。当添加粒径为5/10μm的PS微球时,试样的开孔率为54.87%,空气渗透速率为8.43 m3·h-1·Pa-1·m-2,抗压强度为8.05 MPa,耐碱腐蚀率为99.95%,并且此时材料内部微孔分布均匀、孔径较小,所产生的气泡平均尺寸小,气泡发生器的综合性能最好。（3）研究了三种操作工况对气泡发生器产生气泡的大小及数密的影响。结果表明,随压差的增大,气泡平均粒径减小,气泡数密度增大;随气液比的增大,气泡平均粒径增大,气泡数密度也增大;随液流流量的增大,气泡平均粒径减小,气泡数密度也减小。当压差介于0.02 MPa-0.06 Mpa之间、气液比在1:2-1:4之间、液流流量在0.6 m3/h-1.0 m3/h之间时,堇青石陶瓷膜气泡发生器产生的气泡平均直径在23.54μm-36.43μm之间,气泡数密度1.93×103-1.97×104个/mm3之间,能很好的满足气浮要求。
Abstract
qi pao fa sheng qi shi fu shua zhu de guan jian bu jian ,ta zhi jie ying xiang dao qi pao de da xiao he shu mi du ,cong er ying xiang dao fu shua xiao lv 。mu qian chuan tong de qi pao fa sheng qi cun zai wei kong yi du sai 、fa pao bu jun yun 、cao zuo liu cheng fu za ji neng hao gao deng que dian ,yi du xian zhi le qi pao fa sheng qi de fa zhan 。li yong duo kong tao ci mo fa pao bu jin cao zuo jian chan 、neng hao di ju ji ju da de bi biao mian ji you li yu da liang wei qi pao de chan sheng 。jin qing dan you yu ju you yuan liao jia ge di lian 、nai fu shi xing neng hao 、bi biao mian ji da 、ji xie jiang du gao deng zhu duo you shi ,shi yi chong xing neng you yi de duo kong tao ci mo zhi bei cai liao 。yin ci ben wen yi lian jia de gong ye ji jin qing dan fen wei yuan liao ,cai yong “fen bu zhi bei 、zheng ti zu zhuang 、yi ci shao jie ”de fang shi zhi bei le zeng ge xing neng you yi de xin xing tao ci mo qi pao fa sheng qi ,tong guo gai bian qi pao fa sheng qi de jie gou zai yi ding cheng du shang huan jie le fa pao bu jun ji wei kong yi du sai de wen ti 。tan tao le sheng pi de zhi bei can shu 、qi pao fa sheng qi de zu zhuang fang fa 、zao kong ji （chong lei /han liang /li jing ）、shao jie wen du 、bao wen shi jian yi ji cao zuo gong kuang dui qi pao fa sheng qi xing neng de ying xiang 。bing cai yong XRD、SEM、ya gong ce shi fen xi ji shu ji shu ma xian wei she xiang ji shu dui qi pao fa sheng qi de duan mian xing mao 、wu xiang zu cheng 、kong jie gou 、kong jing fen bu ji qi pao li jing fen bu jin hang le biao zheng 。ju ti jie lun ru xia :（1）tan jiu le cheng xing gong yi 、lian jie zu zhuang fang an 、zao kong ji 、shao jie gong yi deng zhi bei tiao jian dui fa pao qi xing neng de ying xiang 。jia shui liang 、gan zao shi jian deng cheng xing tiao jian de chan yin su shi yan jie guo biao ming ,dang jia shui liang wei 40%、gan zao wen du wei 100℃,gan zao shi jian wei 12 h,bing zai gan zao 2-3hshi jin hang tuo mo ,ke zhi de jie gou wan zheng de sheng pi zu jian 。tong guo dui bi san chong zu zhuang fang an fa xian ,jiang sheng pi zu jian chan du zhi bei ,zai yong tao ci jiang liao nian jie zu zhuang ,zui hou zheng ti shao jie de fang shi ,ke huo de xing neng you yi 、qi mi xing liang hao de qi pao fa sheng qi 。dui bi le tian jia bu tong zao kong ji chong lei he han liang de qi pao fa sheng qi de zeng ge xing neng ,jie guo biao ming ,tian jia tan fen ,rong yi chu xian ran shao bu wan quan de xian xiang ;tian jia dian fen ,shi yang nei bu rong yi xing cheng da liang bi ge qi kong ;er tian jia PSwei qiu bing ju zai tian jia liang wei 10%shi ,cai liao nei bu neng xing cheng jun yun de wei kong jie gou ,suo chan sheng de qi pao che cun jiao xiao ju qi pao shu mi du jiao gao 。kao cha le bu tong shao jie wen du he bao wen shi jian zhi bei de qi pao fa sheng qi de ji xie xing neng he fa pao xing neng 。jie guo biao ming ,shao jie wen du dui cai liao jing xiang jie gou ying xiang xian zhe ,sui shao jie wen du de zeng jia ,jin qing dan xiang de yan she feng xian zeng da hou jian xiao bing zai 1300℃shi feng zhi da dao zui da 。di gao shao jie wen du ji yan chang bao wen shi jian jun neng di gao cai liao ji xie jiang du ,dan tong shi ye hui jiang di cai liao nei bu de wei kong shu liang ,dao zhi wei qi pao shu liang jian shao 。dang shao jie wen du wei 1300℃、bao wen shi jian wei 1 hshi ,qi pao fa sheng de zeng ge xing neng zui you 。（2）yan jiu le chan yi li jing ji fu ge li jing PSwei qiu zao kong ji dui qi pao fa sheng qi xing neng de ying xiang ,bing tan jiu le liang chong li jing lei xing de zao kong ji dui qi pao fa sheng qi kai kong lv de ying xiang ji li 。jie guo biao ming ,tian jia chan yi li jing PSwei qiu de shi yang ,sui zao kong ji li jing de zeng jia cai liao kong xi lv zeng jia ,dan dang PSwei qiu li jing chao guo 10μmshi ,cai liao nei bu kai shi chu xian jiao duo de da che cun wei kong ,dao zhi cai liao de kang ya jiang du ji nai jian fu shi lv da fu jiang di ,chan sheng qi pao de ping jun zhi jing zeng da ju qi pao fen bu jun yun xing bian cha 。tian jia fu ge li jing PSwei qiu shi yang de nei bu ,kong leng shang fen bu zhao geng duo wei guan xiao kong ,zhe xie wei guan xiao kong shi zao cheng cai liao kong xi lv bi tian jia chan yi li jing PSwei qiu shi yang gao de zhu yao yuan yin 。ci wai ,tian jia fu ge li jing PSwei qiu shi yang de kong qi shen tou su lv ye geng gao ,fa pao shi cai liao shou dao de zu li geng xiao ,yin ci fa pao xing neng geng hao 。dan shi sui zhao fu ge PSwei qiu li jing de zeng da ,shi yang kang ya jiang du jian xiao 、nai jian fu shi xing bian cha 、wei kong kong jing fen bu bian kuan 、wei qi pao ping jun che cun bian da ju fen bu jun yun xing bian cha 。dang tian jia li jing wei 5/10μmde PSwei qiu shi ,shi yang de kai kong lv wei 54.87%,kong qi shen tou su lv wei 8.43 m3·h-1·Pa-1·m-2,kang ya jiang du wei 8.05 MPa,nai jian fu shi lv wei 99.95%,bing ju ci shi cai liao nei bu wei kong fen bu jun yun 、kong jing jiao xiao ,suo chan sheng de qi pao ping jun che cun xiao ,qi pao fa sheng qi de zeng ge xing neng zui hao 。（3）yan jiu le san chong cao zuo gong kuang dui qi pao fa sheng qi chan sheng qi pao de da xiao ji shu mi de ying xiang 。jie guo biao ming ,sui ya cha de zeng da ,qi pao ping jun li jing jian xiao ,qi pao shu mi du zeng da ;sui qi ye bi de zeng da ,qi pao ping jun li jing zeng da ,qi pao shu mi du ye zeng da ;sui ye liu liu liang de zeng da ,qi pao ping jun li jing jian xiao ,qi pao shu mi du ye jian xiao 。dang ya cha jie yu 0.02 MPa-0.06 Mpazhi jian 、qi ye bi zai 1:2-1:4zhi jian 、ye liu liu liang zai 0.6 m3/h-1.0 m3/hzhi jian shi ,jin qing dan tao ci mo qi pao fa sheng qi chan sheng de qi pao ping jun zhi jing zai 23.54μm-36.43μmzhi jian ,qi pao shu mi du 1.93×103-1.97×104ge /mm3zhi jian ,neng hen hao de man zu qi fu yao qiu 。
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论文作者分别是来自贵州大学的程敏，发表于刊物贵州大学2019-07-16论文，是一篇关于气泡发生器论文,多孔陶瓷膜论文,堇青石论文,气泡粒径分布论文,气泡数密度论文,贵州大学2019-07-16论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自贵州大学2019-07-16论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：气泡发生器论文; 多孔陶瓷膜论文; 堇青石论文; 气泡粒径分布论文; 气泡数密度论文; 贵州大学2019-07-16论文;