共查询到20条相似文献,搜索用时 140 毫秒
1.
一、前言碱式氯化铝是一种新型的无机高分子絮凝剂,由于它具有投加量少、净化效率高、成本低等优点,近年来发展十分迅速。生产碱式氯化铝的原料很多,主要包括铝灰、结晶氢氧化铝、氯化铝、硫酸铝及含铝矿五大类。其中结晶氢氧化铝是氧化铝厂以铝土矿为原料,大规模工业化生产出的半成品,所以原料消耗和成本甚低,具有流程短;投资 相似文献
2.
3.
《精细与专用化学品》2014,(8):6
李和平主编本书以精细化工产品的生产工艺及流程为核心,详细介绍了精选的500余种精细化工产品的生产或合成原理、生产工艺流程及流程图。为了更好地理解这些流程,还介绍了产品的中英文名称、分子式或组成、性能指标、生产原料与用量、产品用途等。本书内容涵盖了精细化工产品的主要类别,包括表面活性剂、胶黏剂、涂料、香料与香精、化妆品、食品与饲料添加剂、 相似文献
4.
江苏省徐州化工三厂直接用磷酸和纯碱为原料,采用磷酸一钠净化除杂,经干燥、聚合制备食品添加剂三聚磷酸钠已获成功。工艺设备简单,操作方便,生产稳定,从而为我国食品三聚磷酸钠的生产开辟了一条新途径。产品符合食品添加剂三聚磷酸钠地方标准草案的要求,并经山东省食品发酵工业研究所等单位试用于肉类罐头、火腿、香肠 相似文献
5.
浅谈使用试剂级原料及工业级产品替代食品添加剂生产食品的危害 总被引:1,自引:0,他引:1
贾冰凝 《中国石油和化工标准与质量》2009,29(2)
为了满足人们对食品多样化、营养化、方便化、风味化和高级化的需求,食品添加剂在现代食品工业中已成为了不可或缺的部分.食品添加剂的使用是食品生产加工中的一个重要环节,滥用食品原辅料和食品添加剂是造成食品安全隐患的重要原因.本文分析了试剂级原料及工业级产品用于食品生产加工可能带来的污染以及给人身健康、生命安全带来的危害,深入阐明在食品加工中不可使用试剂级原料及工业级产品替代食品添加剂. 相似文献
6.
7.
8.
《精细化工原料及中间体》2014,(1)
正石家庄新宇三阳实业有限公司以生产基本有机化工原料、食品添加剂为主,主导产品有食品添加剂冰醋酸、乙醛、乙酸乙酯、无水乙醇和兽药等系列产品。"文挚"牌食品添加剂冰醋酸等系列产品在业内形成良好口碑。多年来,公司以人为本、精细管理、诚信经营,以产品转型升级、技术进步、研发创新为抓手,以清洁生产、循环经济、绿色环保、美丽化工为奋斗目标,积极推进各项工作的开展,克服了金融危机 相似文献
9.
香兰素不仅是食品添加剂行业及饲料添加剂行业中不可缺少的主要香原料,同时也是生产部分医药中间体的重要原料,该产品在化妆品、烟酒、农业、电镀等工业中也得到广泛的应用。 相似文献
10.
《中国石油和化工标准与质量》1981,(1)
标准代号和名称GB 1856一80碳酸钠(食品添加剂)oB 1 557一50碳酸氢钠(食品添加剂)Ga 1 555一50碳酸氢铰(食品添加剂)oB 1 55。一50磷酸氢钙(食品添加剂)GB 1 590一50六偏磷酸钠(食品添加剂)GB 1 592一80硝酸钠(食品添加剂)Gn 1 592一80硫酸钙(食品添加剂)oB 1593一50焦亚硫酸钠(食品添加剂)GB 1 894一80无水亚硫酸钠(食品添加剂)oa 2 595一50钾明矾(食品添加剂)oa 1 896一50钱明矾(食品添加剂)GB 1897一80盐酸(食品添加剂)GB 1898一80轻质碳酸钙(食品添加剂)oa 1 599一80亚铁氰化钾(食品添加剂)eB 1 900一502,6一二叔T基对甲酚(食品… 相似文献
11.
12.
13.
14.
Christopher J. Gabelich Tae I. YunBradley M. Coffey I.H.“Mel” Suffet 《Desalination》2002,150(1):15-30
Pretreatment may constitute up to one-fourth of the total costs of a membrane desalting facility. By using preexisting conventional filtration plants for pretreatment, significant cost savings may be realized. However, coagulant residuals from the pretreatment process may negatively affect reverse osmosis (RO) membrane performance. Various RO membranes were tested at three different treatment plants in southern California, using either aluminum sulfate (alum) or ferric chloride coagulants and chloramines. Repeated testing using alum with multiple RO elements revealed rapid deterioration in specific flux (up to 60% over 100 h of operation), as well as progressive reductions in salt rejection (typically 3-4% over 500 h of operation). Microscopic analysis of the fouled membranes revealed that the foulants were primarily aluminum hydroxide and aluminum silicate materials. In contrast to the RO data for alum coagulation, which showed declining membrane flux, the specific flux data using ferric chloride and chloramines increased over time for all membranes. Salt rejection decreased significantly during testing of each membrane. These data suggest that the RO membranes were physically degrading over time. The RO membranes may have been degraded by residual iron catalyzing a chlorine-amide reaction on the membrane surface, despite the fact that chlorine was present as chloramines. 相似文献
15.
Processing and kinetics studies on the alumina enrichment of coal fly ash by fractionating silicon dioxide as nano particles 总被引:1,自引:0,他引:1
Coal fly ash produced in the northern China is a potential bauxite substitute for aluminum production because of its high alumina content. However, this industrial application has been limited for its high silicon content. Alumina enrichment by removing silicon becomes a key technology for its utilization. A novel process was developed to fractionate the coal fly ash into high purity nano silicon particles and aluminum enriched residual ash. The procedure has major steps as sodium silicate dissolution with sodium hydroxide, first carbonation to remove impurities, second carbonation to precipitate silicon, and silicon precipitate recovery as a mesospheric nano particles product. Morphological and X-ray diffraction evidences indicated the glassy amorphous silicon content of the ash was dissolved in the sodium hydroxide solution whereas mullite remained in the residue. Kinetics study indicated that the second carbonation was a kinetically second order medium fast multi-phase reaction in which sodium silicate was precipitated as silicic acid. It was found that the reaction was controlled by the mass transferring resistance in the liquid membrane. These nano silicon dioxide particles were in size of 50 nm with a purity of 96%. Alumina content in process residue was slightly increased from 42.00 to 49.20%. Silicon dioxide content was reduced from 48.89 to 30.26%. Ratio of alumina/silica was increased from 0.86 to 1.63. 相似文献
16.
17.
常压下高浓度NaOH浸取铝土矿预脱硅 总被引:5,自引:1,他引:4
探讨了常压下高浓度NaOH浸取铝土矿的预脱硅过程中初始NaOH浓度、反应温度、浸出时间和碱矿比等因素对氧化铝、氧化硅浸出率及剩余固相中铝硅比的影响,并得出动力学方程. 结果表明,在50% NaOH溶液、碱矿比2.5及135℃浸出时,反应时间5~20 min内,可使铝土矿铝硅比由7.6提高到12以上,从而满足拜尔法生产氧化铝对铝土矿的品位要求. 用此方法处理铝土矿预脱硅,可以免去物理选矿环节,与其他化学选矿方法相比,具有节能降耗的优点,同时提高铝土矿品位,为中低品位铝土矿的开发利用开辟了一条新途径. 相似文献
18.
The role of charcoal like components (also referred to as char) in soil organic matter reactivity has become increasingly evident. Recently we have demonstrated the role of such material in bauxite. Sodium hydroxide is used at elevated temperatures to separate aluminium hydroxide from ferric oxide in bauxite in the Bayer process and charcoal like material may interfere with the precipitation of aluminium hydroxide. In this paper we study the solubility, structure and composition of charcoal in the feed stockpile of bauxite ore by solubility, laser Raman spectroscopy, Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, and pyrolysis gas chromatography mass spectrometry (py-GC/MS). The charcoal was treated under simulated Bayer process conditions of 245 °C in 5 M sodium hydroxide. The alkaline digestion test showed that a large fraction of the charcoal was insoluble (∼90%). Surprisingly, the spectroscopic characterisation revealed not only typical polycyclic aromatic networks expected for charcoals (aromaticity fa = 0.64), but also showed an aliphatic character and that the sample contained alkyl chains ranging from nC10 to nC23 carbon chain lengths. The role of this material in bauxite refineries is discussed. 相似文献
19.
介绍了喷铝防腐蚀技术的原理、施工工艺、质量检查,以及施工过程中的注意事项。此项技术的推广应用可大大延长设备的寿命,或者用喷铝设备代替高品质材料,可为企业创造可观的经济效益。 相似文献