加食盐煅烧的石灰特性及铁水脱硫

采用加食盐煅烧的石灰进行铁水脱硫实验室试验，结果表明其脱硫率比未加食盐煅烧的石灰脱硫率平均提高了２０．１２％。因此加食盐煅烧的石在活性大幅度地提高，尤其是ＣａＯ晶粒结构发生变化，即晶粒间距增大和微细裂缝，孔洞数量增多，为铁水参数增大脱硫反应界面积的缘故。     

铁水脱硫剂

本发明为铁水脱硫(如高炉铁水炉外脱硫)提供了一种可喷射的脱硫粉剂。该脱硫剂包括由焙烧石灰、冶金萤石及石油焦组成的渣生成成分,镁粉与渣生成成分合成一种可向铁水喷射的粉剂脱硫剂。     

铁水及钢水用脱硫剂的制备方法

本发明涉及到有关铁水及钢水用石灰脱硫剂的制备方法。众所周知,石灰可用于铁水及钢水的脱硫处理。石灰的碱性高,有益于脱硫。然而纯石灰的脱硫效果却不佳,这可能是由于石灰的熔点过高,在一般的铁水或钢水温度下不熔所致。为此需要在石灰中加入一种熔剂(如氟化钙),以使脱硫剂在与铁水或钢水接触后至少能够部分熔化,形成一种液态脱硫渣。有人提出,在烧结石灰中加入一定量的     

钒钛铁水喷粉预处理研究

重庆大学刘守平等人通过喷粉试验研究了钒钛铁水的预脱硫和预脱磷。结果表明 :石灰—电石、石灰—电石—镁粉和镁粒三种脱硫剂都可把钒钛铁水中硫脱至 0 0 10 %以下 ,用石灰—电石—镁粉和镁粒脱硫时 ,铁水温降也很小 ,只有 0～ 15℃。当向钒钛铁水喷入高氧化性高碱度粉剂预脱磷时 ,只有当铁水中 [Ｓｉ]+[Ｔｉ]+ [Ｖ]≤ 0 2 6 0 %～ 0 30 0 %时 ,才有明显的脱磷效果。研究结论如下 :(1)用石灰、电石或石灰、电石、镁粉组成的脱硫剂都可对钒钛铁水取得理想的脱硫效果 ,可把铁水中硫降至 0 0 0 5 %以下 ,但石灰、电石脱硫时 ,铁水温降达 2…     

单喷颗粒镁脱硫工艺优化实践

介绍了承钢150 t铁水脱硫工艺概况,生产初期存在脱硫效率低、回硫严重等问题,不能满足大板坯以优质钢种为主的生产需求。通过在喷吹过程中顶加石灰、优化扒渣操作、改善脱硫反应的动力学条件等措施,改善了铁水包内铁水的搅拌效果,顶加的石灰将脱硫产物固定在顶渣中且稠化了脱硫终渣,扒渣效果得到有效改善,提高了钝化镁粒的有效利用率,有效防止了铁水回硫。镁粒的脱硫效率提高了24.2%,回硫率降低了32.2%。     

钒钛铁水喷粉预处理研究

通过喷粉试验研究了钒钛铁水的预脱硫和预脱磷。结果表明：石灰－电石、石灰－电石－镁粉和镁粒三种脱硫剂都可把钒钛铁水中硫脱至0．010％以下，用石灰－电石－镁粉和镁粒脱硫时，铁水温降也很小，只有0－15℃。当向钒钛铁水喷入高氧化性高碱度粉剂预脱磷时，只有当铁水中[Si] [Ti] [V]≤0.260%-0.300%时，才有明显的脱磷效果。     

金属镁作铁水脱硫剂在宝钢使用效果好

金属镁作为前苏联冶金专家研制的新一代铁水脱硫剂,自应用后,就一直被欧美钢厂普遍使用。上海宝钢集团公司于近期从美国引进的镁脱硫设备,这是国内首家采用这一新型脱硫剂。金属镁的脱硫能力极强。它与传统的石灰、苏打、电石粉这些铁水脱硫剂相比,具有渣量少。铁耗小、脱硫时间短。引起铁水温降微弱等明显优势。有数字为据：在脱硫率同等条件下,It铁水脱硫需石灰10一,脱硫时间15－Z山山n,铁水温降IO－ZO多度。金属镁：0．3－0．4kg,脱硫时间7－slum,铁水温降4－5℃。并且由于镁脱硫剂对设备的侵蚀较轻,没有如石灰脱硫造成大量…     

铁水脱硫剂的研究和发展

通过对常用脱硫剂脱硫反应和性能的介绍，指出研制铁水复合脱硫剂的必然性，并从热力学的角度分析了复合脱硫剂的构成。大量的研究和应用表明，铁水脱硫剂将主要朝两个方向发展；一是以石灰基为主的复合脱硫剂；二是配加石灰、电石、焦炭等的金属镁脱硫剂。     

钒钛铁水喷吹脱硫试验

本文介绍了攀钢处理钒钛铁水及半钢的喷吹脱硫设备。采用石灰、电石作脱硫剂的脱硫效果并分析了影响效果的因素。采用电石、石灰、萤石组成混合脱硫剂,其脱硫效率可达80％以上,铁水中硫含量可降至0.005％以下。     

铁水预处理脱硫系统工艺设备技术改造

对马钢长材事业部铁水预处理设备目前存在的问题进行了研究,经过理论分析及现场摸索,对现有的铁水预处理脱硫系统进行了工艺设备升级改造,实现了从单喷镁粉脱硫形式到混喷石灰加镁粉脱硫形式的转变,达到稳定脱硫的目的。     

SENSORY RESTRICTION WITH ISOLATION EXPERIENCES IN CHILDREN WITH PHENYLKETONURIA.

COMPARED 2 GROUPS OF CHILDREN WITH PHENYLKETONURIA, THOSE WITH A HISTORY OF EARLY SENSORY RESTRICTION OR ISOLATION AND THOSE WITHOUT, ON: (1) INTERPERSONAL BEHAVIOR, (2) LANGUAGE COMPREHENSION, (3) INTELLIGENCE, AND (4) INCIDENCE AND SEVRITY OF PERSONALITY DISTURBANCES. THE FINDINGS, DISCUSSED IN THE CONTEXT OF SENSORY-DEPRIVATION AND SENSORY-RESTRICTION RESEARCH, SUPPORTED THE HYPOTHESIS THAT EARLY ALTERATIONS IN SENSORY ENVIRONMENT LEAD TO LATER IMPAIRMENT IN INTERPERSONAL, EMOTIONAL, AND INTELLECTUAL FUNCTIONING. THE DEGREE OF THIS IMPAIRMENT WAS FOUND TO BE RELATED TO AGE AT THE TIME OF THE EARLY STRESS EXPERIENCE, BUT NOT TO THE DURATION OF SENSORY RESTRICTION OR ISOLATION. (34 REF.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

CATIONIC SURFMERS WITH BENZYL GROUPS:SYNTHESIS AND COPOLYMERIZATION WITH ACRYLAMIDE

A series of cationic surfmers with benzyl groups (QARBCs) with different R groups on the benzene ring were synthesized and characterized by IR,<'1>H-NMR,<'13>C-NMR. The aggregation of QARBCs was studied by the steady-state fluorescence technique. It tumed out that QARBCs had surface activity and their cntical micelle concentration (CMC) values varied in the range of 10<'-2>-10<'-3> moI/L with slight increase with temperature. The copolymerization of acrylamide (M<,1>) and QARBCs(M<,2>) was studied below and above CMC,their reactivity ratios were determined by the Finemann-Ross method. It was found that below CMC,copolymerization took place in a homogeneous system and reactivity ratios of acrylamide and QARBCs were less than l;while above CMC,reactivity ratios of QARBCs were greater than l. The copolymerization mechanism of QARBC was observed to be similar to that of micellar polymerization. QARBCs tended to homopolymerization,which gave rise to micro-blocky sequences in the polymer backbone. The Q and e values of QARBCs were calculated according to the Alfrey-Price equation by using r<,1(AM)> and r<,2(QARBO).> Samples of poly(AM-co-QARBC) were prepared above and below CMC and their hydrophobic associations were studied by the steady-state fluorescence spectra and 2D NOESY spectra,and their critical associating concentrations (CAC) were estimated. The results showed that samples of poly(AM-co-QARBC) prepared above CMC had stronger hydrophobic association in aqueous solution than those prepared below CMC.     

用微机进行电弧燃烧测碳硫的数据处理

介绍了用微机进行电弧燃烧法测碳硫数据处理的原理、程序，实践证明该方法测试结果迅速、准确并可存档备查。     

高硅锰硅合金的生产

简要介绍了生产高硅锰硅合金中应注意的几个问题，即要有较高的炉温，合适的渣型，正确的熔炼操作。     

经济型转炉炼钢技术的生产实践

济钢第三炼钢厂通过采用综合砌炉、溅渣护炉、顶底复吹、副枪和自动化炼钢技术,有效降低了耐材消耗、提高了炉衬寿命,改善了熔池搅拌条件,提高了钢水质量和吹炼终点碳氧双命中率,降低了工人劳动强度。     

高强度烧结钢

为开拓粉末冶金材料新的应用领域，近年来对高强度烧结钢进行了大量的研究与开发。本文简要介绍Ｈｏｇａｎａｓ公司开发的一些高强粉末冶金材料及对一些高强度烧结材料尺寸变化的控制。     

Toward nature WITH nurture.

Responds to the comments of D. C. Rowe (see record 2001-00159-006), J. C. Loehlin (see record 2001-00159-007), A. Reifman (see record 2001-00159-008), and S. McGuire (see record 2001-00159-009), which comment on the A. W. Collins et al discussion (see record 2000-13816-002) on behavioral genetics and the parenting theory. Collins et al respond to each of the criticisms in turn. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

带有横向送料装置的筒式加热炉

承钢集团万利钢管公司出德国ＮＥＨ（ＮｅｕｎｋｉｒｃｈｅｒＥｉｓｅｗｅｒｋＨｏｍｂｕｒｇ）工厂引进的焊管生产线，配套购入带有横向送料装置的筒式加热炉，经消化改进，于１９９８年末投入运行，经初试该加热炉满足了轧钢工艺要求，温度均衡，运行平稳可。     

高铜非标钼精矿处理研究进展

高铜非标钼精矿不适合采用传统冶炼工艺处理。目前处理高铜非标钼精矿主要有加压浸出、焙烧-酸浸、电化学浸出和生物浸出等工艺方法,本文着重阐述高铜非标钼精矿的研究进展情况。     

碳热法冶炼硅锆合金的实践

介绍了碳热法冶炼硅锆合金的生产实践，并重点阐述了预防和处理炉瘤的办法，以及碳热法生产硅锆合金的前景。实践表明，碳热法可稳定地生产出含锆12％～17％、硅48％。52％的硅锆合金。