铁尾矿提纯纳米白炭黑的研究  

Study on preparation of nanosilica from iron tailing

作　　者：张明熹[1] 李锋锋[1] 吕朝霞[1] 李娟娟[1] 王庆辉[1] 张丽芳[1] 候桂芹[1] 沈毅[2] 唐晓飞[2] 

机构地区：[1]河北联合大学轻工学院,唐山063000 [2]河北联合大学材料学院,河北省无机非金属材料重点实验室,唐山063009

出　　处：《化工新型材料》2013年第2期33-35,共3页New Chemical Materials

基　　金：国家自然科学基金主任基金项目(51042004);国家自然科学基金青年项目(51102076);河北省计划支撑项目(09276725D);河北省高等学校科学技术研究青年基金项目(2010134);2011河北联合大学轻工学院科研基金资助项目;2011河北联合大学轻工学院大学生科技创新项目

摘　　要：以铁尾矿为原料,采用热碱反应法,经过浸酸、滤洗、酸浸渣热碱反应、稀酸法控制沉析二氧化硅工艺,并在稀酸沉析过程中进行表面处理,制备出超细纳米白炭黑。采用单因素变量法考察NaOH的浓度、混合料煅烧时间、碱溶时间、碱溶温度对白炭黑产率的影响,并采用XRD、SEM对产物的微观结构和形貌进行了表征。得最佳工艺条件为:5g煅烧铁尾矿的酸浸渣与10g NaOH混合均匀,于500℃煅烧50min后,将混合物溶于190ml水,并加入4g NaCl,混合液于70℃搅拌反应60min后过滤,滤液用HCl酸化至pH=8,陈化1h后,再经抽滤、洗涤、干燥,得到纳米白炭黑产品。通过计算,此工艺条件下制备纳米白炭黑的产率可达到97.41%,所得白炭黑为水合非晶物质,颗粒近似球状,粒径为50～100nm左右。The nanosilica particles were preparated successfully via thermokalite reaction method using iron ailing as raw materials, involving pickling, filters washing, thermokalite reaction, precipitating silica controlled by diluted acid and disperser. The effects of experimental conditions, such as concentration of NaOH, calcination time of mixture, dissolution temprature and time of alkali, on the nanosilica productivity were reaserched in detail by single factor method. The morphol-ogy and structure of the nanosilica were characterized by X-ray difraction（XRD） and scanning electron rnicroscopy（SEM）. The optimal technological conditions were as follows： pickling dregs of 5g activated iron tailing and 10g NaOH were ad-mixed intensivly and calcined at 500℃ for 50min, and put into 190ml water,and 4g NaC1 was also added into the solution, subsequently. The mixed solution was stirred at 70℃ for 60rain in a water bath and filterred. Excessive HClsolution was added dropwisely into the filtrate until the pH value was adjusted to 8, and a large amount of flocculants separated out from solution. The suspended solution was aged for lh and subsequently filtered, rinsed with distilled water and ethanol absolute and dried. The productive rate of nanosilica preparated at above conditions is 97.41% by calculation. The nanosilica was a kind of amorphous undefined matter. The nanosilica particles were globular in shape and the diameter was 50-100nm.

关 键 词：铁尾矿 纳米白炭黑 热碱反应 废矿利用 

分 类 号：TQ127.2[化学工程—无机化工]