【作者】 白新芳；

【导师】 刘润静；

【作者基本信息】 河北科技大学 ， 化学工艺， 2010， 硕士

【摘要】 硫酸钡是一种重要的无机化工材料,由于其易于开发、成本低廉,具有较低硬度和吸油值,无毒、颜色浅、亮度高、防酸碱、耐光性和分散性好等众多优越性能,硫酸钡已经成为一种无可代替的无机填充材料。普通硫酸钡粒子经过微细化处理(粒子粒径:0.1μm~1.0μm)之后,在塑料、涂料、油漆、陶瓷与造纸等诸多相关领域都显示出更好的应用效果和更高的经济价值。我国拥有丰富的重晶石(一种天然的含硫酸钡的化合物)资源,其储量、生产量和出口量均居世界第一位。但我国出口的重晶石95%以上属于低档次、低附加值、低利用率的原矿和初级产品,且又需要高于其几十倍的价格大量进口硫酸钡微粉。可见,研究制备高质硫酸钡微粉是我国节约并高效利用相关矿产资源、提高行业竞争力的首要之选。由于纳米级超细硫酸钡颗粒很小,其分散性差,常常发生团聚,使其在应用方面受到一定限制,所以,微米级的超细硫酸钡颗粒的研制越来越受到人们重视。本论文采用微反应器技术结合传统的反应沉淀法对亚微米级硫酸钡的制备进行了相关研究。以BaS和BaSO4为原料,考察了原料浓度、温度与流量对采用微反应器制备纳米级硫酸钡的影响,并制得粒径90 nm的纳米级硫酸钡晶种,在此基础上,结合传统反应沉淀法,分析了温度、晶种加入量、反应物料量、加料时间等因素对亚微米级硫酸钡颗粒粒径的影响,并对制备条件进行了优化。用扫描电镜和激光粒度分布仪分别对其形貌与粒度进行了表征。结果表明:在反应物浓度为0.5 mol/L、晶种量为4.0 mL、加料时间约1 h、室温的条件下制得了粒径分布约0.3μm~0.5μm,粒度分布较窄且形貌为近球形的亚微米级硫酸钡颗粒。更多还原

【Abstract】 As an important kind of inorganic product, the barium sulfate has many advantages, such as low cost on the development, low hardness and oil absorption values, avirulence, light color, high brightness, anti-acid and anti-alkali, lightfastness and well dispersed. It has become a kind of irreplaceable inorganic filler material. Normal micro-processed barium sulfate particles (particle size: 0.1μm ~ 1.0μm) have shown better application effects and high economic value in plastic, dope, paints, ceramics, paper, and many other related fields. China is rich in barite (a kind of natural compounds containing barium sulfate), and its reserves, outputs and exports rank first in the world. However, more than 95% exports of barite of China are low-level, low added value, low utilization of the ore and primary products. At the same time, the domestic demand for high quality barium sulfate powders are needed with high-priced imports. Therefore, preparation of high-quality barium sulfate powder is the prime choice of conservation of barite mineral resources and enhancement of business competitiveness.As the nano-scale barium sulfate particles are small, the dispersion is poor, so the application subjects to certain restrictions. Therefore, micro-level barium sulfate particles attract more and more attention of people. In this paper, the submicron-barium sulfate was prepared by micro-reactor technology combined with the traditional precipitation method. Barium sulfate emulsion, as seeds, was prepared by micro-reactor technology using BaS and Na2SO4 as reactant. The BaSO4 crystal seeds were prepared, whose particle size is 90 nm, and relation between the operation conditions (content ratio, temperature and flow rate) and barium sulfate particle size were studied. In combination with the traditional precipitation method, the effects of temperature, amount of seeds, reactant, and time on the particle size of micrometer-barium sulfate was analyzed. The morphology and particle size of barium sulfate were characterized by the scanning electron microscopy and laser particle size distribution instrument. The results showed that particle size of barium sulfate were about 0.3μm ~ 0.5μm with narrow distribution, and the optimum conditions were as follows: reactant concentration was 0.5 mol /L, seeds were 4.0 mL, and reaction time was 1 h at room temperature. The morphology of BaSO4 particle is sphere.更多还原