作　　者： ; ; ; ;

机构地区： 中国科学院

出　　处： 《太阳能学报》 2014年第1期41-46,共6页

摘　　要： 以稻壳气化发电厂灰渣为原料,先后通过球磨粉碎、酸处理和高温煅烧工艺制备出高纯白炭黑。采用ICP、XRD、SEM、全自动物理化学吸附仪和激光粒度仪对原料和产品的化学组成、物相、表面形态、结构特征和粒径进行分析,结果表明:稻壳灰中非硅杂原子(K、Na、Ca和Fe等)有促进稻壳灰烧结的作用,金属氧化物含量为8%的稻壳灰,烧结温度低于700℃;无机酸溶煮能除去稻壳灰中97.0%以上的非硅杂原子,经球磨粉碎和HNO3溶煮的稻壳灰中非硅杂原子除去率达到98.9%;预处理后稻壳灰比表面积增大,颗粒表面呈现大量微孔,且高温煅烧(860℃)后未出现烧结现象。所制得白炭黑SiO2含量达99.57%,比表面积为69m2/g,平均粒径为19μm。 The rice husk ash from biomass gasification and power generation plants was used as raw material to produce high-purity white carbon black by ball-milling, acid treatmemt and calcination techniques. The properties of raw materials and products including chemical composition, morphology, surface area, pore distribution and particle size, had been investigated by inductively coupled plasma-atomic emission spectrometry （ICP）, X-ray diffraction （XRD）, scanning electron microscopy （SEM）, automatic physico-chemical absorption apparatus and laser particle analyzer （LPSA）. The results indicated that non-silicon heteroatom （K, Na, Ca and Fe） from rice husk ash would promote agglomeration, the sintering temperature of rice husk ash was lower than 700℃, when its metallic oxide content reach 8%. More than 97.0% of the non-silicon heteroatom could be eliminated from rice husk ash by mineral acid boiling, ball-milling and nitric acid treating could remove 98.9% of the non-silicon heteroatom from rice husk ash. After pre-treatment, the specific surface area of rice husk ash was increased, lots of micropore distributed on the particle surface, and there was no sinter for the pre-treatment rice husk ash by high calcination temperature （860℃）. The white carbon black produced from rice husk ash, in which SiO2 content up to 99.57% , specific surface area was 69m2/g, and the average grain diameter was around 19μm.

关 键 词： 白炭黑 电厂稻壳灰 金属氧化物 相变

领　　域： [化学工程]