Φ8.2m×30.4m种分槽机械搅拌系统安装工艺研究与改进

介绍Φ8.2m×30.4m种分槽机械搅拌系统传统安装方法,分析种分槽搅拌系统传统安装法的弊端,提出工艺改进方案,并介绍取得的良好效果。     

山东铝施工方法获部级工法

近日，山东铝业工程有限公司潜心研究的“种分槽搅拌装置倒装工法”被中国有色金属建设协会命名为中国有色金属建设行业部级工法。该工法经过多次施工应用，具有技术先进、方法成熟、简便快捷、经济效益明显等特点。目前，常规种分槽搅拌装置安装通行的简外组装整体吊装工艺存在占用场地大、使用大吨位吊车机械费用高、     

锌浸出槽搅拌系统的改造设计

指出了湿法冶炼系统浸出槽采用空气搅拌所存在的问题，详细介绍了一种新型机械搅拌机的设计过程，以及该搅拌机所采用的新技术、新特点，探索性地指出了湿法冶炼行业搅拌机的发展方向。     

大高径比机械搅拌槽在湿法炼锌浸出工序的应用

介绍了某湿法炼锌厂常规浸出工艺中，空气搅拌槽能耗高，浸出条件难控制等问题，提出了由空气搅拌槽改造为大高径比机械搅拌槽的方案，确定了搅拌器的参数，改造后获得了较好的节能效果。     

浅谈大型机械搅拌槽槽底结构设计

根据大型机械搅拌平底槽槽底结构的设计实践,分析了其设计要点。介绍了适用于大型机械搅拌装置的槽底结构。     

中非铜钴伴生矿高效协同搅拌浸出装备

针对传统搅拌浸出装备存在的缺陷，深入研究了铜钴协同浸出机理，研发了一系列新型搅拌浸出成套装备，包括新型搅拌浸出槽气体分散装置、浸出槽搅拌轴水封装置、搅拌浸出槽用浓酸稀释装置、兼有稳流和提升作用的搅拌浸出槽，并创新采用多台大型浸出槽串联模式。实践表明，该成套装备SO₂气体的利用率同比提升了15%以上，铜浸出率可达95%～97%，钴浸出率达85%，还解决了SO₂气体外逸污染环境问题和浓硫酸添加稀释不当对浸出槽边壁损坏的问题，实现了多台大型浸出槽高效串联协同工作。     

从尾矿液中回收金的装置

一种从尾矿液中回收金的装置，包括设有进矿口和若干个出矿口的分矿箱，分矿箱的出矿口分别通过管路与若干台搅拌吸附槽的进矿口相并连，搅拌吸附槽的底部设有放矿口，搅拌吸附槽的底部通过管路与白灰氯气混合槽相连，每台搅拌吸附槽的上部设有排矿口。排矿口通过管路与集矿箱顶部相连，集矿箱的底部设有出矿口，出矿口通过管路与泥浆泵相连。其目的是提供一种投资小，不需除杂也能从尾矿液中回收金的装置。     

机械搅拌槽传动装置的新结构新工艺

机械搅拌槽在使用过程中经常遇到振动问题， 分析原因很多， 本文从搅拌轴的支点探讨这个问题。介绍一种搅拌叶的焊接结构和浆叶制造、加工方法     

种分槽搅拌系统安装与维修工艺改进

种分槽是氧化铝生产的主要设备之一,其搅拌系统的安装非常关键.分析了种分槽搅拌系统传统安装方法存在的问题,提出了工艺改进方案,并在实际生产中应用,取得了良好的效果.     

拜耳法种分槽搅拌电机过热的原因及对策

根据种分槽搅拌电机普遍出现的过热现象,综合分析了引起过热的原因,提出相应的防范措施,以避免电机在运行中烧毁造成种分槽沉槽事故的发生.     

直岛冶炼厂酸厂最新作业情况

三菱材料公司直岛熔炼和精炼厂有两座带尾气洗涤吸收装置的单接触法硫酸厂 ,用以处理来自三菱公司连续铜熔炼和吹炼炉、阳极炉和废酸分解装置的烟气。本文介绍这两个酸厂最近实施的改造和改进情况     

Volumetric out-of-furnace heat treatment of 3600-M3 decomposers

Specifications require that all the welds in 12-m-diam. decomposers with a capacity of 3600 m³ be subjected to high-temperature tempering before going into service in order to alleviate the stresses from the welding operation. Specialists at the organizations VNIIPTkhimnefteapparatury and VNIImontazhspetsstroi have proposed out-of-furnace volumetric (complete) of the assembled decomposer with the use of special heaters. The use of this heating method has shortened assembly operations while providing the welds with a highquality heat treatment and reducing the stresses overall (including welding stresses, stresses from assembly of the decomposer, etc.) The technology ensures uniform heating of the housing of the decomposer and provides for close control over the process. The experience gained in heat-treating decomposers can also be used in the construction of other containers that come into contact with corrosive media. __________ Translated from Metallurg, No. 3, pp. 61–64, March, 2006.     

"The hunt: Job hunting for the new PhD psychology": Comment.

Comments on B. Perlman's (see record 1976-21272-001) article on job hunting for the new PhD psychologist and argues that Perlman missed 2 important points: (1) the type of degree the job seeker holds, and (2) where the degree was obtained. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Characterization of an Arabidopsis thaliana mutant that has a defect in ABA accumulation: ABA-dependent and ABA-independent accumulation of free amino acids during dehydration

In an attempt to elucidate the physiological role of ABA in seed dormancy and the adaptive response to dehydration, we isolated an ABA-deficient mutant of Arabidopsis thaliana (L.) Heynh. which germinated in the presence of a gibberellin biosynthetic inhibitor. Genetic analysis showed this mutation is a new allele of a recently reported locus aba2, and therefore has been designated aba2-2. The levels of endogenous ABA in fresh and dehydrated tissues of the aba2-2 mutant were highly reduced compared to those of wild-type plants. As a consequence, aba2-2 plants wilt and produce seeds with reduced dormancy. Dark germinated seedlings of the aba2-2 mutant showed true leaves, which were not observed in those of the wild type, indicating that aba2-2 embryos grew precociously during seed maturation. In the dehydrated tissues of the wild-type plants, the levels of free proline, isoleucine and leucine were elevated to a content approximately 100-fold higher than those in fresh tissues. In contrast to the wild-type plants, dehydration-induced accumulation of proline was highly suppressed in the aba2-2 mutant plants while that of leucine and isoleucine accumulated. Furthermore, exogenous application of ABA to wild-type plants promoted accumulation of free proline, but not leucine nor isoleucine. These results suggest that dehydration-induced accumulation of free leucine and isoleucine is achieved independent of ABA.     

Comparison of 12 assays for detecting hCG and related molecules in urine samples from Down syndrome pregnancies

Urine is a new medium for Down syndrome testing. In an effort to determine the best type of human chorionic gonadotropin (hCG)-related immunoassay for urine testing, we examined 14 Down syndrome and 91 unaffected pregnancy urine samples with 12 established assays. The assays included (a) those that detect hCG beta-core fragment only; (b) those that detect beta-core fragment with less than 18 per cent free beta-subunit cross-reactivity; (c) that which equally detects free beta-subunit and beta-core fragment; and (d) those that detect hCG, free beta-subunit, or combinations thereof. The seven type a and b assays had the highest sensitivity for Down syndrome. The median MOM for Down syndrome was 5.93 (range 4.73-7.53). At a 10 per cent false-positive rate, the median observed detection rate was 93 per cent (range 79-100 per cent) and the median predicted detection rate was 85 per cent (range 69-96 per cent). The assays that did not mainly detect beta-core fragment (types c and d) had poorer screening performance. The median MOM for Down syndrome was 2.70 (range 2.16-3.63 MOM). At a 10 per cent false-positive rate, the median observed detection rate was 50 per cent (range 36-64 per cent) and the median predicted detection rate was 37 per cent (range 21-62 per cent). We infer that the assays that only detect beta-core fragment, or beta-core fragment with minor free beta-subunit cross-reactivity (types a and b), are the better urine-based tests for Down syndrome screening.     

Salivary deoxyribonuclease I polymorphism separated by polyacrylamide gel-isoelectric focusing and detected by the dried agarose film overlay method

Isoelectric focusing of whole saliva samples on polyacrylamide gels (pH 3.5-5), followed by dried agarose film overlay detection, was employed to determine the type of salivary deoxyribonuclease I (DNase I). Since this detection method had not only a high sensitivity, but also a high band resolution, it was possible to determine DNase I types from saliva samples of 2-5 microL. Pretreatment of saliva samples with neuraminidase simplified the isozyme pattern and enhanced the sensitivity. The DNase I types in all 30 saliva samples showed a good correlation with the types found in the corresponding blood, semen, and urine samples. This preliminary trial indicates that DNase I typing from saliva samples is a new and promising method for individualization of casework samples in the field of forensic biology.     

Sesame seed and sesame seed oil contain masked allergens of growing importance

Sesame seed and sesame seed oil have been thought of as rare causes of food allergy, representing less than 1% of all food allergy cases. We now report nine cases of IgE-dependent allergy to sesame seed and/or sesame seed oil, six of which were diagnosed in 1995 alone. Our skin test results draw attention to the poor quality of a commercial sesame seed extract and the good sensitivity of skin prick tests made with a freshly prepared sesame seed flour extract. The diagnosis of this food allergy was established by double-blind oral provocation tests, with doses of sesame seed flour ranging from 100 mg to 10 g. Allergy to sesame seed oil was also demonstrated in some cases. The sensitivity of the Pharmacia Phadebas CAP System for the detection of sesame seed-specific IgE was only mediocre. We draw attention to the important use of sesame seed in modern cooking, a fact which may explain the growing frequency of this allergy. We underline the particular risk with sesame seed oil. Sesame seed should also be considered a cause of allergic reactions to drug products and cosmetics.     

铝土矿选矿尾矿酸法提铝除铁实验研究

采用黄钾铁矾法,对铝土矿选矿尾矿酸法提铝后的高铁硫酸铝溶液进行了除铁实验,考察了亚铁离子的氧化条件、除铁反应的pH、时间、温度、晶种等因素对除铁效果的影响,确定了黄钾铁矾法除铁的最佳工艺条件为:先将高铁硫酸铝溶液在温度为30℃,双氧水用量为100 ml/L,时间为5 min的条件下氧化处理,然后在温度为95℃,pH=2,晶种用量为10 g/L,反应时间为180 min的条件下反应除铁。此条件下溶液的除铁率为95%,铝损失15%,溶液微黄。     

A new method for allantoin determination and its application in allantoin determination in Agrostemma githago L. Seed

We have established several optimal conditions for qualitative and quantitative allantoin determination by applying Ehrlich's reagent. The limit of detection for allantoin determination amounts to 5 x 10(-6) mM. Allantoin is determined quantitatively by measuring the absorbance at 440 nm (from 300 to 1000 micrograms/ml). The color of the complex becomes stable by standing for 10 min at room temperature. We have used these conditions for allantoin determination in Agrostemma githago seed.