高浓度熟料溶出的工艺研究

优化烧结法生产 ,提高产量、节约能耗是氧化铝生产急需解决的问题之一。实现高浓度溶出可以提高精液浓度 ,减少湿法系统物料流量 ,达到提高产能、增加产量、降低成品成本的目的。本文通过对国内外高浓度熟料溶出发展情况和烧结法影响高浓度溶出的因素进行分析研究 ,提出了提高熟料A/S的必要性 ;指出了适合我国条件的熟料A/S大小和生料配方 ;分析了温度和αk 对溶出和分离的影响机理和规律 ;提出了适合高浓度溶出的溶出条件和浓度大小。对生产有一定的指导意义。     

2001世界陶瓷原料市场分析与预测

近几年陶瓷原料工业呈稳步发展 ,反映了陶瓷工业强大的发展势头。 1 999年度大多数陶瓷原料的生产和销售都有所增长 ,预示着未来陶瓷原料工业的成功。以下是几种在陶瓷工业领域应用较广泛的陶瓷原料的生产与消费情况。通过对这几种陶瓷原料生产和消费情况的分析 ,对未来陶瓷原料市场做出了预测 ,旨在给各陶瓷企业的生产提供一定的参考     

中药降香对酪氨酸酶激活作用的动力学研究

酪氨酸酶是生物合成黑素的主要酶。降香有促进酪氨酸酶活性的作用。通过对中药降香的水提取液和乙醇提取液促进酪氨酸酶活性作用的观察研究及降香提高酪氨酸酶活性的动力学观察研究，得到Lineweaver-Burk曲线、动力学回归方程及米氏常数Km值。为研究中药有效成分激活黑素细胞的机理奠定了基础。     

The influence of food emulsifiers on fat and sugar dispersions in oils. III. Water content,purity of oils

The influence of water on the interactions between fat and sugar crystals dispersed in triglyceride (vegetable) oils was qualitatively estimated from sedimentation and rheological experiments. The experiments were performed both with and without food emulsifiers (monoglycerides and lecithins) present in the oil. The effects of minor natural oil components (nontriglycerides) on the interactions and on emulsifier adsorption to the crystals were examined by comparing a commercial refined oil and a chromatographically purified oil. The results show that water generally increases the adhesion between fat and sugar crystals in oils and also increases the surface activity of the oil-soluble food emulsifiers. Minor oil components give a small increase in the adhesion between fat and sugar crystals in oils, but do not influence the adsorption of food emulsifiers in any systematic way.     

高氯原料在预分解窑系统中的实践与应用

若原燃料中氯含量过高,会影响新型干法生产线窑系统的正常运行,引起窑尾系统的结皮和堵塞。消除氯不利影响的常规措施是采用“旁路放风”,但这既要增加投资,又要增加熟料的热耗和电耗。新绛威顿水泥有限责任公司1000t／d生产线所用原燃料中氯含量大大超标,通过采取优化操作、调整配料和加强生产管理等手段,基本消除了氯对窑系统的不利影响,实现了系统连续、稳定、正常的生产运行。     

固态物料超临界CO2萃取过程的传质研究

影响固态物料超临界CO2 萃取过程传质效率的因素很多 ,本文以菊花为原料 ,研究了原料的预处理方式、超临界CO2 流量、固态被萃取物粒径、被萃取物的装填方式等因素对传质效率的影响 ,结果表明 ,降低被萃取物粒径 ,增大超临界CO2 流体的流量 ,改变被萃取物的形状 ,降低原料的自然堆积密度、在塔内采用流体再分布器等措施可以明显提高超临界CO2 流体萃取固态物料的传质效率     

Crystallography and equilibrium solubility for ammonium and potassium orthophosphites and hypophosphites

The composition and solubility properties of eight ammonium and potassium orthophosphites and hypophosphites were determined to evaluate the potential of these classes of materials for increasing the plant nutrient content of liquid fertilizers. Phase relationships for the systems (NH₄)₂O-P₂O₃-H₂O, K₂O-P₂O₃-H₂O, (NH₄)₂O-P₂O-H₂O, and K₂O-P₂O-H₂O were determined along with the crystallographic properties (X-ray and optical) of the solid phases. Toxicity and phosphite response was tested in greenhouse experiments for the compounds.     

Process conditions affect pigment quality and yield in extracts of purple sunflower hulls

Extract of purple sunflower hulls is a potential red food colorant; however, suitable process conditions must still be identified. Selected process variables were studied using bench-scale units to prepare, clarify, concentrate and spray dry extracts. Concentration by evaporation at 32°C and addition of maltodextrin to 15% (wt/dry wt) prior to drying largely eliminated pigment degradation during those steps. Relative to water extracts, extracts prepared with 5 to 15% ethanol in water generally yielded more pigment with similar levels of degradation and loss during subsequent processing. Use of 5% ethanol/2% citric acid reduced yield by about half relative to water, but gave a powder with a lower degradation index and wetting time. Percentage recovery of pigment during concentration and drying was not greatly affected by solvent type or extraction temperature.     

下河沉积型瓷石的工艺特性与开发应用的探讨

本文论述了新近在江西下河发现的沉积型瓷石的地质特点、矿石特征、精泥性能、成瓷工艺及其开发应用前景。     

粉煤灰掺量及颗粒群分布与水泥浆体流变性的关系研究

研究了原状粉煤灰与磨细粉煤灰不同掺量和不同颗粒群分布与水泥浆流变性能的相互关系。结果发现:原状粉煤灰加入水泥后具有降低水泥浆的粘度与屈服值的作用,且随粉煤灰细度及掺量的增加而更明显;磨细粉煤灰加入水泥后具有提高水泥浆的粘度与屈服值的效应,且随粉煤灰细度及掺量的增加而更突出。用灰色关联分析原理证实了原状灰<10μm的颗粒含量与水泥浆的流变性呈负关联,即对改善水泥的流动性是有益的;而磨细灰<10μm的颗粒含量与水泥浆的流变性呈正关联,即对提高水泥的流动性是不利的。