LIU Chunpeng XU Yousheng HUA Yixin Kunming Institute of Technology
,
Kunming
,
650093
,
China.
材料科学技术（英文）
In applying the microwave radiation to extractive me- tallurgy,it is essential first of all to find the extent of microwave energy absorbed by various minerals experi- mentally.In this paper,more than 25 kinds of common useful minerals have been individually irradiated by a 500 W,2450 MHz microwave source in an enclosed quartz crucible to ascertain their heating temperature in a definite time.In addition,the reduction and cbloridization tests were also carried out on the titanomagnetite concentrate and pentlandite with microwave heating,respectively. These experiments indicate potential applications of util- izing microwave energy in extractive metallurgy.
关键词:
microwave radiation
,
null
,
null
,
null
TAO Dongping LIU Chunpeng ** Dept.of Metallurgy
,
Kunming Institute of Technology
,
Kunming
,
650093
,
China+ To whom correspondence should be addressed
材料科学技术（英文）
The rate processes of oxidative dearsenication of niccolite ore in microwave oven and in conventional furnace were measured with thermogravimetric technique.The results show that the dearsenication rate of niccolite ore with microwave heating becomes faster than that with conventional heating. Under the conditions of an approximate linear heating and a definite air flow,the oxidative dearsenication process of niccolite ore is mainly controlled by interfacial chemical reaction.The ex- perimental data are in agreement with the kinetic model of linear heating as follows: In{[1-(1-α)~(1/3)]/T}= In (PAM)/(r_oρφE)(1-(RT)/E)-E/(RT) Thus the apparent activation energies of oxidative dearsenication of the niccolite ore containing differ- ent additions have been obtained from the model.
关键词:
kinetics
,
null
,
null
,
null
王力臻
,
闻红丽
,
孙淑敏
,
张勇
功能材料
doi:10.3969/j.issn.1001-9731.2014.18.031
以核桃壳为碳源,微波辐射法制备了介孔活性炭。用XRD、SEM 和低温氮气吸脱附对所制备活性炭进行了物性分析；用恒流充放电、循环伏安和交流阻抗等方法分析了微波功率、辐射时间对活性炭电容性能的影响。确定活性炭的最佳制备工艺为微波功率480 W,辐射时间9 min。制得的活性炭平均孔径为4.44 nm,介孔率为78.51%,比表面积达1530 m2/g,为不规则、疏松多孔的无定形结构。当充放电电流为100 mA/g时,比电容为226.4 F/g,循环1000次后比电容为192.2 F/g,每次循环电容衰减仅为0.015%。
关键词:
电化学电容器
,
活性炭
,
核桃壳
,
微波辐射
赵新红
,
李晓斌
,
陈静
,
祁永东
,
问娟娟
,
季东
无机材料学报
doi:10.15541/jim20130595
以丁二酸-氯化胆碱-四乙基溴化铵三元低共熔混合物作为溶剂和模板剂,借助微波辐射在常压下合成了具有多级孔结构的 SAPO-5分子筛。系统地考察了 P2O5/Al2O3与 HF/Al2O3摩尔比,硅源与晶化时间等条件对多级孔SAPO-5分子筛合成的影响。采用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、N2物理吸脱附以及29Si魔角旋转核磁共振(29Si MAS-NMR)等手段对合成产物的结构和性质进行了表征。分析结果表明：在 SAPO-5分子筛晶体中同时存在晶体内介孔和晶体间介孔,29Si MAS-NMR分析表明Si的取代方式以SM3取代机理为主。此外,通过SEM可知在特定合成条件下可得到具有六角纳米盘状特殊形貌的多级孔SAPO-5分子筛。
关键词:
SAPO-5
,
低共熔混合物
,
微波辐射
,
多级孔
吴之强
,
徐泽杨
,
毕淑娴
,
詹海鹃
,
马保军
,
刘万毅
应用化学
doi:10.11944/j.issn.1000-0518.2017.05.160306
以煤基活性炭(AC)和苯胺(ANI)为原料,通过原位-溶液聚合法制备了煤基固体酸催化剂AC@PANI-SO3H(APS),利用扫描电子显微镜(SEM)、傅里叶变换红外光谱(FTIR)、X射线光电子能谱(XPS)和热重分析(TG)等技术手段对催化剂进行了结构和性能的表征. 研究了该催化剂在微波辐射下催化合成Schiff碱化合物的活性,并对其催化工艺条件进行了优化考察. 结果表明,催化剂用量5%(以每摩尔邻苯二胺用量为基准),反应时间3~20 min,溶剂选用乙醇(EtOH),Schiff碱化合物产率可达80%~93%,说明该催化剂在微波催化合成席夫碱反应中变现出良好的催化活性,反应时间短,工艺简单操作,且催化剂能重复使用5次. 通过红外发现,催化剂重复5次后活性下降的主要原因是固体酸表面键合的磺酸基官能团消失,从而导致活性降低.
关键词:
煤
,
固体酸
,
Schiff碱合成
,
微波辐射
,
工艺优化
