Results 61 to 70 of about 161,737 (96)

Effect of Ingredient on Viscosity of CaO-MgO-SiO2 -Al2O3 Quaternary Refining Slag Series

open access: yesTeshugang, 2013
Using temary-quadratic orthogonal design method the viscosities of CaO-MgO-SiO2-Al2O3quaternary refining slag series with basicity (CaO/SiO2) 1.2-6.0, MgO 1.9%-6.0% and Al2O36%-29.1% are measured and studied by using comprehensive meter for melt ...
张明博, 李俊国, 马红强
doaj  

Effect of Al2O3 -SiO2 -CaO Refining Slag Series on Morphology Control of Inclusions in Spring Steel 55SiCrA

open access: yesTeshugang, 2013
The effect of ingredient and basicity ( 1.0 ~ 1.2 ) of (/% :) 38. 5 ~ 45. 8CaO-38. 2 〜42. 0SiO2-8 ~ 15 Al2O3-8MgO refining slag series on morphology of inclusions in spring steel 55SiCrA (/% : 0. 53C, 1. 50Si, 0. 70Mn, 0. 69Cr, 0. 008P, 0. 003S, 0.
王向红, 周俐, 刘天泉, 蒙玉勇
doaj  

氧枪射流及转炉溅渣护炉用炉渣黏度的研究

open access: yes, 2006
吹氧是炼钢中最重要的操作之一,直接影响冶炼效果和钢的质量,如何用好氧气,是炼钢生产技术的一个关键环节。本课题以炼钢用氧技术的基础研究为主,专注于氧枪喷头的设计、喷头射流特性的研究,此外,还对转炉溅渣护炉用炉渣的黏度进行了测试分析。 对一种新型转炉氧枪喷头进行了射流特性的测试。新型喷头上6个喷孔按照设计参数可分为两组,倾角、出口马赫数和喉口直径各不相同,两组喷孔在喷头端面的同一圆周上交替布置。利用自由射流的自模性,将该喷头按1: 3比例缩小进行了射流特性的冷态测试,得到了描述其射流特性的中心线速度衰减 ...
杨肖
core  

Process Practice on Improving Metallurgical Quality of Gear Steel 20CrMnTiH

open access: yesTeshugang, 2018
The process flowsheet of gear steel 20CrMnTiH (/%: 0.17~0.23C, 0.80~1.20Mn, 0.17~0.37Si, 1.00~1.45Cr, 0.04~0.10Ti, ≤0.035S, ≤0.030P, ≤0,0020O) is desulphurized metal-120t BOF-LF-160mmx160mm billet casting- rolling to Φ20~45mm products.
杜东福   +4 more
doaj  

四氯化钛精致尾渣的综合利用研究

open access: yes, 2017
对攀钢钛业公司生成的四氯化钛精致尾渣进行碱浸,考察了浸出介质、反应温度、碱浓度、液固比、氧压和反应时间对钒浸出率的影响。在合适的工艺条件下,钒浸出率达95%以上。浸出液先沉淀铝,再分步结晶分离氯和钒。浸出液先蒸发结晶生成氯化钠,再冷却结晶制备出纯度89%以上的正钒酸钠。实现了铝、钠、氯和钒的高效分离与高附加值产品的转化,解决了四氯化钛精制尾渣堆放时的有价资源流失和环境污染问题。
张洋, 马娜, 陈丽杰, 瞿金为
core  

Effect of Refining Slag Ingredient on Inclusions in Steel 31CrMoV9

open access: yesTeshugang, 2017
Tested steel 31CrMoV9 (/% : 0.28 ~0.33C, 0.30 ~0.35Si, 0.49 ~0.60Mn, 0. 011 ~0.016P, 0.027 ~ 0.031S, 2.47 ~2.60Cr, 0. 16 ~0.23Mo, 0. 12 ~0. 19V) is melted by a 25 kg induction furnace, and the effect of binary basicity 2.5 ~ 3.5 of different ingredient ...
徐泽宇   +5 more
doaj  

[Expert consensus on the implementation of enhanced recovery after surgery in percutaneous endoscopic interlaminar lumbar decompression/discectomy (2020)]. [PDF]

open access: yesZhongguo Xiu Fu Chong Jian Wai Ke Za Zhi, 2020
The Group Of Minimally Invasive Spinal Surgery And Enhanced Recovery Professional Committee Of Orthopedic Surgery And Enhanced Recovery Association Of China Rehabilitation Technology Transformation And Promotion.
europepmc   +1 more source

氰化尾渣中抑砷富集硫铁的研究

open access: yes, 2016
以某冶炼厂氰化尾渣为研究对象,在富集硫铁的同时去除部分砷。以H_2SO_4作为硫活化剂,采用腐殖酸钠和Ca(ClO)_2组合砷抑制剂对该氰化尾渣进行浮选实验。浮选结果显示,精矿中硫品位可达到48%以上,同时砷品位降低到0.2%以下。结合SEM和XRD分析手段对该浮选结果进行分析,研究了氰化尾渣中砷的赋存状态,并对氰化尾渣中硫砷难以分离的原因进行了初步探讨。
付国燕   +5 more
core  

保护渣粘模机理

open access: yes, 1986
一、前言自60年代初我国采用混合的固体氧化物(以下简称保护渣)保护钢水浇铸以来,粘模问题一直未得到解决。尤其是近年来,考虑到使用高含量石墨保护渣造成钢锭头部和锭身表面增碳的后果,许多钢厂为了提高钢材质量,希望降低保护渣中碳含量。但是在研制低碳渣的过程中,首先遇到的被认为难以克服的技术关键问题,就是粘模问题。使用后的保护渣液渣层不规则地牢固地粘结在钢锭模表面,在钢锭模再次使用前必须清除干净。若清理不净 ...
孔繁芬
core  

[Multidisciplinary team model for patients with oral cancer and systemic diseases: an expert consensus]. [PDF]

open access: yesHua Xi Kou Qiang Yi Xue Za Zhi, 2020
Zhang DS   +12 more
europepmc   +1 more source

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