高压均质-沉淀法制备高分散纳米白炭黑研究  

Preparation of highly dispersed nanosilica from rice husk by aprecipitation method combined with high pressure homogenization

作　　者：顾珊 常艳 张江林 周劲松[3] 

机构地区：[1]浙江百能科技有限公司,浙江杭州310012 [2]湖北东方化工有限公司 [3]浙江大学能源清洁利用国家重点实验室

出　　处：《无机盐工业》2018年第2期66-69,74,共5页Inorganic Chemicals Industry

摘　　要：以稻壳灰为原料,对传统沉淀法加以改良,提出了高压均质与沉淀法联用技术。在纳米白炭黑微粒形成初期,采用高压均质技术对微粒进行超微细化,获得了高分散的纳米白炭黑。研究了沉淀反应终点pH、盐酸浓度、反应温度、均质压力、表面活性剂等对纳米白炭黑物化性能的影响,得到了制备纳米白炭黑产品的最佳工艺条件:沉淀反应终点pH为8.5~9.0、盐酸浓度为1.0 mol/L、反应温度为60℃、均质压力为69~103.4 MPa。结果显示,在最佳工艺条件下制得的白炭黑产品白度达到93%左右,DBP吸油值达3.3 mL/g左右,为高纯度、高分散的纳米白炭黑。Based on the traditional precipitation method and using rice husk ash as the raw material,an innovated precipitation method combined with high pressure homogenization was proposed to prepare highly dispersed nanosilica.The high pressure homogeneous technology was used for super-fine comminution of SiO_2 particles.The effects of precipitation reaction end-point pH,acid concentration,reaction temperature,homogeneous pressure and surfactant on the properties of nanosilica were investigated.The optimal technological conditions of generating nanosilica from rice husk ash by precipitation combined with high pressure homogenization method were obtained as follows： the precipitation reaction end-point p H was at 8.5~9.0,the hydrochloric acid concentration was 1.0 mol/L,the precipitation reaction temperature was 60 ℃ and was homogeneous pressure was at 69 ~103.4 MPa.Results showed that the whiteness of nanosilica products under the optimal preparation conditions was about 93%,and the DBP value of prepared nanosilica was about 3.3 mL/g.The prepared nanosilica products were obvious of high purity and high dispersion.

关 键 词：稻壳 纳米白炭黑 高压均质 

分 类 号：TQ127.2[化学工程—无机化工]