海绵钛生产中杂质控制研究

还原蒸馏是海绵钛生产过程中影响海绵钛产品质量最重要的工序之一,海绵钛生产过程中氮、氧、铁、氯等杂质的引入途径为还原生产用原料四氯化钛和镁,同时还原蒸馏过程控制对海绵钛产品中杂质含量也有重要影响,根据杂质引入途径提出了海绵钛生产过程中降低海绵钛产品杂质的措施。     

海绵钛生产产生的废盐水用于处理生活污水的经济性分析

海绵钛生产中采用Na OH溶液处理氯化精制工序和镁电解工序产生的尾气时,会产生含一定浓度次氯酸钠的废盐水,为此,对该废盐水在生活污水消毒处理中的应用进行了分析。结果表明,海绵钛生产过程中产生的废盐水可用于生活污水消毒处理,当生活污水中的有效氯含量在4.9~5.5 mg/L、接触时间控制在0.5 h的情况下,经消毒后的水质能够达到GB 8978—1996《污水综合排放标准》,降低了海绵钛生产企业废水处理成本,提高了资源综合利用水平。     

高氯海绵钛产品处理方法研究

为降低镁还原-蒸馏法生产的高氯海绵钛产品中杂质氯的含量,提高产品等级,对高氯海绵钛分别进行回炉处理和酸洗处理实验。结果表明:回炉处理后产品的氯含量虽有下降,但杂质氧的含量显著上升,不能达到提高产品等级的目的;酸洗处理后产品氯含量显著降低,且其他杂质含量没有增加,产品质量和经济效益得到有效提升。     

谈降低海绵钛中杂质氧含量的途径

1引言最近海绵钛市场由过去的不景气而变成供不应求，为满足国内外用户对质量的要求，生产厂家必须生产出优质的产品，才能获得较好的经济效益．为此，对海绵钛产品出现的因氧含量偏高而影响产品等级率必须给予解决，以适应市场的需要．2原因分析及措施影响海绵钛杂质氧含量的原因较多，其中包括：采用原料质量标准问题、操作问题、设备问题及产品试样问题等等，加强这些方面的管理将是降低海绵钛杂质氧含量的有效途径．2．1建立严格的原料质量标准产品的好与坏与原料质量密切相关，镁法生产海绵钛主要原料是精镁和精四氯化钛．精镁由两次补…     

海绵钛生产过程中杂质元素的控制方法

分析了采用“I”型半联合法生产海绵钛的过程中,影响产品杂质含量和布氏硬度的因素,以及造成产品Cl、C、Fe、N、Mn等杂质元素含量偏高和硬度较高的原因,并提出严格控制原料纯度、新反应器使用前的清洁、生产过程中工艺控制、破碎加工过程减少有害杂质的污染等的具体措施,供海绵钛生产企业参考。     

氯对粘结磁粉生产和性能的影响

探讨了粘结磁粉生产过程中氯对生产设备、厂房的影响,原料中高氯铁红破坏作用明显,不容忽视。分析了氯对混料、配料的影响,影响原料的成份一致性,配比的准确性;影响原料的水分含量,造成结团混料不均匀。通过形貌分析、性能测定,氯含量高对预烧料烧结不明显,六角片状程度低,粒径不均匀,原料经处理后氯含量降低,烧结完全,六角片状程度高,粒径均匀;性能测定得到氯含量高造成产品磁性能较低,压制厚度高,不容易与高分子结合。     

九十年代海绵钛生产发展趋势

本文论述了镁法生产海绵钛的工艺，并简要介绍了熔盐电解法和熔融还原法生产海绵钛的过程及概况，提出了发展我国海绵钛生产的几点建议。     

90年代海绵钛生产发展趋势

本文论述了镁法生产海绵钛的工艺，并简要介绍了熔盐电解法和熔融还原法生产海绵钛的过程及概况，提出了发展我国海绵钛生产的几点建议。     

苏联的海绵钛生产动向

据报道,苏联位于哈萨克共和国乌斯季卡明诺戈尔斯克的海绵钛工厂因原料问题从1991年10月末就已停止了生产,一般认为在投入的原料中必须混入占多少百分比的澳大利亚的金红石矿因外币不足而中断。即使原料方面无问题,其海绵钛生产也在受着国内政情不稳定等因素的影响。 苏联年产海绵钛估计为40000t,其中出口1000～     

并联式镁法海绵钛生产中降低N、O含量的有效途径

随着海绵钛市场竞争的日益激烈以及应用领域的拓展,尽最大可能提高海绵钛质量成为海绵钛生产企业当前的首要技术任务.在海绵钛质量标准中,氮,氧杂质元素较大程度地影响着海绵钛质量.根据并联式镁法海绵钛生产过程中氮、氧杂质元素的来源及其影响因素,海绵钛生产可利用真空台包出镁、氩气保护四氯化钛贮槽、适当提高还原过程中反应液面、开始...     

高纯稀土氧化物的生产实践

介绍了一座高纯稀土氧化物生产厂建成投产后的生产实践主要状况。其包括稀土产品的生产能力及产量;选用的原料及生产工艺技术;生产中的三废状况及其治理;生产后的主要技术经济指标;产品的销售方向及发展前景;对一些问题的讨论。     

湿法炼锌洗渣过程中体积平衡及酸根平衡研究

创新性地对湿法炼锌洗渣过程中带入系统的体积以及酸根进行了系统的测算,并且针对如何在洗渣过程中保持湿法炼锌系统体积平衡以及酸根平衡的问题提出了具体措施,对于湿法炼锌的生产具有一定指导意义.     

提高热连轧轧制节奏生产实践

介绍新钢热连轧厂生产产能的制约瓶颈,通过对生产节奏、运输节奏的合理控制,降低粗轧区温降,最大化地满足生产,发挥产能潜力,顺利完成生产目标.     

山东省轧钢技术进步回顾与发展探讨

回顾了“九五”期间山东省轧钢生产技术的发展进步 ,针对存在的问题和技术发展趋势 ,提出“十五”期间山东省轧钢生产技术的发展重点是 :提高装备水平和产品档次 ;采用新技术 ,降低生产成本     

Two patients with overlapping de novo duplications of the long arm of chromosome 9, including one case with Di George sequence

Testicular peritubular cells produce a paracrine factor termed PModS that mediates mesenchymal-epithelial interactions and modulates Sertoli cell functions essential for the process of spermatogenesis. Sertoli cells produce lactate as a preferred energy metabolite for developing spermatogenic cells. The current study was designed to examine the actions of PModS and hormones on Sertoli cell lactate production at various stages of pubertal development. Sertoli cells were isolated from pre-pubertal (10 day), mid-pubertal (20 day) and late pubertal (35 day) rat testes. Lactate accumulation in the conditioned-medium of cultured Sertoli cells was measured. Basal lactate production increased approximately fivefold during pubertal Sertoli cell development. Therefore, lactate production increases as the Sertoli cell differentiates during pubertal development. The ability of regulatory agents such as FSH or a combination of FSH, insulin, retinol and testosterone (FIRT) to stimulate lactate production decreased during pubertal development as Sertoli cell differentiation increased. Purified PModS stimulated lactate production in Sertoli cell preparations throughout pubertal development. PModS had a greater effect than FSH in stimulating late pubertal Sertoli cell lactate production. PModS in combination with FIRT resulted in an additive stimulation of lactate production suggesting a distinct mechanism of action for PModS. Observations support the proposal that the locally produced paracrine factor PModS mediates mesenchymal-epithelial cell interactions during pubertal development and that these interactions promote Sertoli cell differentiated functions (i.e. lactate production) required for the developing spermatogenic cells.     

Right-shifting the oxyhemoglobin dissociation curve with RSR13: effects on high-energy phosphates and myocardial recovery after low-flow ischemia

The influence of temperature and pH on growth of Leuconostoc mesenteroides subsp. mesenteroides FR52 and production of its two bacteriocins, mesenterocin 52A and mesenterocin 52B, was studied during batch fermentation. Temperature and pH had a strong influence on the production of the two bacteriocins which was stimulated by slow growth rates. The optimal temperature was 20 degrees C for production of mesenterocin 52A and 25 degrees C for mesenterocin 52B. Optimal pH values were 5.5 and 5.0 for production of mesenterocin 52A and mesenterocin 52B respectively. Thus, by changing the culture conditions, production of one bacteriocin can be favoured in relation to the other. The relationship between growth and specific production rates of the two bacteriocins, as a function of the culture conditions, showed different kinetics of production and the presence of several peaks in the specific production rates during growth.     

烧结法氧化铝生产过程中镓的行为研究

产品氧化铝中的镓含量与原矿中的镓含量、生产方法及分解过程中的作业条件有关。本文对烧结法氧化铝生产过程中镓的分布进行了普查测定,并着重对熟料溶出过程、碳分分解过程中镓的行为进行了研究。     

Production of hydroxyl radicals in contracting skeletal muscle of cats

Reactive oxygen species increase during exhaustive contraction of skeletal muscle, but characterization of the specific species involved and their rates of production during nonexhaustive muscle contraction have not been investigated. We hypothesized that the production rate of hydroxyl radical (.OH) increases in contracting muscle and that this rate is attenuated by pretreatment with deferoxamine (Def) or dimethylthiourea (DMTU). We measured the rate of production of .OH before, during, and after 5 min of intermittent static contraction of the triceps surae muscles in cats (n = 6) using the formation of p-, m-, and o-tyrosines by hydroxylation of phenylalanine. L-Phenylalanine (30 mg/kg i.v.) was administered to each animal 3 min before contraction. Blood samples were collected from the popliteal vein 1 min before contraction; 1, 3, and 4.5 min during contraction; and 1 min after contraction. During and after contraction, the cumulative production rates of p-, m-, and o-tyrosines were elevated by 42.84 +/- 5.41, 0.25 +/- 0.04, and 0.21 +/- 0.03 nmol.min-1.g-1, respectively, compared with noncontracting triceps surae muscles. Pretreatment with Def (10 mg/kg i.v.; n = 5) or DMTU (10 mg/kg i.v.; n = 4) decreased the cumulative rates of production of p-, m-, and o-tyrosines during and after contraction. Additionally, the rate of tyrosine production increased in proportion to the percentage of maximal tension developed by the triceps surae muscles. These results directly demonstrate that .OH is produced in vivo in the skeletal muscle of cats during intermittent static contraction and that production can occur before the onset of fatigue.     

降低氧化铝生产中熟料折合比的探讨

在氧化铝生产过程中，熟料折合比是烧结法一项重要的综合性指标，本文通过对熟料折合比的定义、计算公式的剖析，分析了生产过程中影响熟料折合比的主要因素，对有效降低熟料折合比的措施进行了探讨。     

Epidemiology of chronic, precancerous and oncologic diseases in workers of asbestos and cement industry

Hygienic, clinical and epidemiologic screening was performed in staff of asbestos and cement goods production enterprise. Various dystrophic processes of pharynx and nasal cavity appeared to prevail among upper respiratory tract diseases. Average exposure to dust during 22 years at the stated production can lead to asbestosis 0-I stage, average exposure during 20.5 years can result in dust bronchitis and occupational allergic dermatosis can result from average exposure to dust during 21 years. Retrospective cohort study of mortality within 1949-1988 failed to find oncologic risk in workers engaged into asbestos and cement goods production higher than in general population.