石英砂生产工艺流程改造

江苏宿迁市强华石英砂有限公司系由原江苏玻璃集团公司的硅质原料基地-白砂车间改制而来。改制后公司的主要业务仍然是每月平均生产5000t石英砂供应苏玻生产浮法玻璃，近年来由于市场竞争加剧，如何降低生产成本的问题显得非常重要。经过调查研究认为，目前公司的生产工艺流程存在不合理之处，完全可以对现行的生产工艺流程实行流程改造，以降低成本，本文对此进行详细论述并对改造后的生产流程进行技术经济评价。     

对3.4m斜毯式投料机改造提高玻璃熔化能力及质量

我公司400t/d玻璃熔窑于1997年9月28日点火投产,经过试生产后,玻璃产量和质量终终不高,料堆进窑后立即偏向,当时。采用人工推料的方法倒正料堆,但效果不明显,后来,我们从投料机的结构,投料与熔化着手进行了大胆的尝试,取得了良好的效果。产量超设计能力10%,一级品率大幅度提高,获得了很好的经济效益。     

玻璃熔窑熔化率的理论计算

采用理论和实践经验相结合的方法,推导出玻璃熔窑熔化率的计算公式,为确定玻璃熔窑熔化区面积提供理论计算依据.     

提高熔窑热效率的一点体会

2001年7月,一座运行了14年的500t熔窑放水冷修,利用此次冷修,我们进行了一些技术改造。在熔窑方面,引进了美国燃烧公司的油枪及其吹扫系统以改善燃烧和熔化质量,同时增加烟气脱硫以适应环保要求。     

土库曼斯坦某矿硅砂选矿试验研究

研究对象用作玻璃硅质原料。文章叙述了对于该硅砂矿不同选矿方法对提硅降铝除铁的影响。通过擦洗-脱泥-磁选流程试验得到了满足中华人民共和国建材行业标准《平板玻璃用硅质原料》质量要求的精砂。     

开发新沂天然硅砂资源建设玻璃硅质原料基地

硅砂是玻璃工业的主要原料。我国玻璃硅质原料矿保有储量虽然很丰富,但优质硅质资源不多,因而质优量大可供建设生产优质平板玻璃原料基地的矿山还是比较少的。本文通过对江苏新沂硅砂的特性、选矿试验研究及开发利用情况进行分析,阐述了建设优质平板玻璃硅质原料基地的可行性和重要性。     

石英砂中二氧化硅的准确测定

样品灼烧、称量、用氢氟酸一硫酸处理,准确加入一定量五氧化二钒,于950℃灼烧至恒量,即可获得准确结果。     

Enrichment of Silica Sand Ore by Cyclojet Flotation Cell

Cyclojet flotation is an alternative technique of jet flotation. It essentially has a mechanism for bubble formation with pulp jet spouting from the apex of hydrocyclone. The size of the bubbles formed with pulp jet in the cyclojet cell is very small, and the quantity of bubbles produced also limits its potential to produce high bubble-particle collision. This is particularly efficient in beneficiation of fine-grained ores. In this study, the performance of the cyclojet flotation cell was tested for removing iron-oxides from silica sand ore. Whether it can be used as an alternative to conventional mechanical cells was studied. The findings obtained from the cyclojet cell were compared with findings obtained from the conventional cell. It was seen that the cyclojet cell produced slightly better results than the conventional cell. Under the best conditions, while the cyclojet cell reduced the iron-oxide content in silica sand from 0.41% to 0.08%, the conventional cell reduced it to 0.10%. While iron removal efficiency was 80.49% for the cyclojet flotation, it was calculated as 75.61% for the conventional cell. These findings showed that cyclojet flotation can be used as an alternative method to conventional flotation for the removal of iron oxides from silica sand.     

Bacterial Retention in Lipopolysaccharide Coated Silica Sand

Abstract

Wastewater reclamation has been widely practiced in agriculture. When reclaimed wastewater is used for irrigation, among other requirements, it is important that the pathogenic bacteria are removed. Consequently, technologies such as immobilization or sorption barriers have been developed. To enhance the removal efficiency, biopolymers have been introduced to amend these immobilization or sorption barriers. In this study, removal of pathogenic bacteria by lipopolysaccharide (LPS)‐amended barriers was investigated by means of laboratory column experiments. Two typical gram‐negative pathogenic bacterial strains of Escherichia coli and Pseudomonas fluoresences and one gram‐positive bacterial strain of Streptococcus mitis were selected as the model bacteria in this research. Bacterial adhesion to uncoated and LPS‐coated silica sand was correlated to their interaction free energies. Both E.coli, P. fluorescens, and S. mitis had negative interaction free energies with silica sand, demonstrating their adhesion potentials to silica sand. After LPS coating, bacterium‐sediment interaction free energies decreased (negatively increased), and consequently, bacterial retention increased. Bacterial deposition coefficient in silica sand corresponded to their interaction free energies with silica sand. This study demonstrated that bacterial retention in porous media was determined by their interactions with the sediments, which could be predicted based on independently determined bacterial and medium physicochemical surface properties.     

石英砂高温焙烧-酸洗除铁动力学研究

采用高温焙烧-酸洗方法除石英砂Fe杂质,实验结果表明,900℃焙烧最佳时间为180 min;焙烧后90℃水浴混酸酸洗360 min,石英砂中Fe去除率可达88.3％,Fe杂质含量降为34.61μg/g.通过扫描电子显微镜(SEM)表征该方法处理前后石英砂形貌,结果表明处理后石英砂表面出现明显裂纹和蚀坑,有助于酸液浸入颗粒内部,提高Fe去除率.利用收缩未反应芯模型对实验数据拟合,该酸洗反应控速步骤为产物内扩散控制,焙烧处理后酸洗反应更快,Fe去除率更高,活化能更低.经900℃焙烧,保温180 min处理石英砂,酸洗反应的活化能是30.88 kJ/mol,未焙烧酸洗反应活化能为36.18 kJ/mol,焙烧后酸洗反应活化能下降了17.2％,说明焙烧处理有利于石英砂的酸洗.     

硅砂对高碱铝硅酸盐玻璃熔解特性的影响研究(英文)

通过固定熔制工艺制度,研究了硅砂原料粒径大小、分布情况、颗粒形态对高碱铝硅酸盐玻璃熔解特性的影响关系。研究结果表明:在玻璃配合料熔制过程中,白色未熔物的产生与石英砂密切相关,石英砂粒径处于45-150μm范围熔化效果最好,石英砂粒度分布为正态分布的熔化效果优于均匀分布,经过粒化处理的石英砂比破碎处理的熔化特性更优,可促进玻璃的熔化。     

用超声波进行的石英砂除铁试验研究

采用自行设计的试验装置进行了用超声波技术处理含"薄膜铁"石英砂的试验,得到较好的除铁效果.试验证明,与机械擦洗相比,处理时间可缩短2/3,除铁率提高15%～45%.     

低铁硅砂对浮法玻璃熔化工艺的影响

铁含量的变化,直接影响玻璃的颜色、玻璃的透光率,进而影响玻璃生产各指标的确定。普通浮法玻璃虽然没有一个明确的、固定的铁含量标准,但铁含量的稳定很重要。通过分析浮法玻璃熔制工艺及澄清工艺,结合生产实践,介绍了低铁玻璃特性,指出了玻璃生产中铁含量保持稳定的重要性,建议将原料铁含量纳入生产控制指标,避免由于铁含量波动对生产造成影响。各种原料的选择应有相对稳定的铁含量,特别是采用两种原料来作为互为备用时,更应该选择铁含量接近的物料,以达到在各物料切换使用时,熔化指标保持基本稳定。