首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   28篇
  免费   1篇
综合类   1篇
化学工业   10篇
矿业工程   8篇
能源动力   1篇
石油天然气   1篇
一般工业技术   1篇
冶金工业   7篇
  2022年   1篇
  2019年   1篇
  2017年   1篇
  2016年   2篇
  2015年   1篇
  2014年   2篇
  2013年   2篇
  2012年   2篇
  2011年   5篇
  2010年   2篇
  2008年   4篇
  2007年   1篇
  2006年   1篇
  2005年   1篇
  2003年   1篇
  2001年   1篇
  1994年   1篇
排序方式: 共有29条查询结果,搜索用时 15 毫秒
1.
Direct reduction (DR) of iron ore with hydrogen is a potential route for near-zero CO2 steelmaking, but vertical shaft DR reactors require that iron ore fines must first be pelletized. This study reports an investigation of the pelletization and subsequent sintering behaviour of titanomagnetite (TTM) ironsand, which is the main iron ore feedstock for New Zealand’s steel industry. Initially green pellets were bound with bentonite and carboxymethyl-cellulose (Peridur), using an average ironsand particle size of 65 µm. The compressive strength of these pellets after sintering at 1200 °C in air for 2 hr was measured to be 976 N, meeting the expected feedstock requirements for a shaft reactor. This strength was attributed to interparticle bonding arising from extensive recrystallisation of titanohematite grains from oxidation of TTM, as well as the formation of a liquid bonding phase due to melting and diffusion of the binders. Building on these results, alternative binders were then explored in order to lower the required sintering temperature. A combination of both organic and inorganic binders was found to deliver optimum performance, wherein carboxymethyl-cellulose based binders provided strength in the green pellets, whilst inorganic binders, such as calcium borate or ground glass, promoted high sintered strengths.  相似文献   
2.
The aim of the current study was to investigate the influence of process parameters and raw material characteristics on physical and mechanical properties of wood pellets made from particles of sugar maple trees of different vigor. Pellets were made in a single pelletizer while controlling temperature (75, 100 and 125 °C), moisture content (8.1, 11.2 and 17.2%), compression force (1500, 2000 and 2500 N) and particle size (<0.25, 0.25–0.5 and 0.5–1.0 mm). Particle size was the most important factor influencing friction in the die, followed by moisture content, compression force and temperature. Moisture content was the most important factor affecting pellet density, followed by temperature, compression force and raw material particle size. Temperature was the most important factor for pellet compression strength, followed by compression force, particle size and moisture content. Friction in the die decreased with increasing particle size and moisture content of the material and increased with increasing compression force. It decreased initially with increasing temperature from 75 °C to 100 °C, and then increased with temperature. Density and strength of pellets increased with temperature and compression force, decreased with increasing particle size, and decreased with increasing moisture content. Pelletizing should be performed at 100 °C to minimize friction and a moisture content of 11.2% to maximize density and compression strength of the pellets. Wood particles from sugar maple trees of low vigor were more suitable for making wood pellets in terms of friction in the pelletizer and compression strength than those from vigorous trees.  相似文献   
3.
针对赤铁矿球团强度低的问题,以巴西某赤铁矿精矿为对象,研究了碱度、内配燃料以及它们的相互作用对赤铁矿球团强度的影响。结果表明:制备含镁熔剂性赤铁矿球团时,将碱度控制在0.3~1.2可显著提高预热球团和焙烧球团的抗压强度;制备内配燃料酸性含镁赤铁矿球团时,焦粉配比不超过1.0%可改善预热球团强度而基本不影响焙烧球团强度;制备内配燃料熔剂性含镁赤铁矿球团时,将焦粉配比控制1.5%以内,球团碱度控制在0.9,可显著提高焙烧球团强度。由此可见,制备内配燃料熔剂性含镁球团是改善赤铁矿球团强度的有效途径。  相似文献   
4.
低品位氧化锌粉矿制粒及碱性浸出   总被引:1,自引:0,他引:1  
小于2 mm的氧化锌矿(含锌5.17%)与5%的水泥混合,制粒并固化,所得颗粒直径5~8 mm。固化3天、10天、45天的颗粒用碱性溶液浸出,最大浸出率分别为92.2%、87.3%、72.9%。减少固化时间能够缩短反应时间、增加颗粒中锌的溶解以及减少浸出剂中初始锌浓度的影响。实验表明颗粒最少需固化3天。动力学研究表明浸出过程受浸出剂通过脉石层的扩散控制,表观速率常数分别为3.51×10-2d-1、8.09×10-3d-1和4.74×10-3d-1。  相似文献   
5.
锌精矿制粒沸腾焙烧新工艺的应用与改进   总被引:1,自引:0,他引:1  
介绍了锌精矿制粒沸腾焙烧新工艺的工业化生产应用与技术改进情况 ,阐述了取得的成果及存在的问题  相似文献   
6.
Brazil is the second-largest producer of iron ore in the world. Brazilian richer superficial deposits are composed of brittle material with fine texture and significant amounts of fines are generated during mining and transport. Another type of ore found in this country is the itabirites that have lower iron contents. Beneficiation and concentration steps are required to prepare these materials for the pelletizing process. A general view of Brazilian types of iron ores, mines, and mining companies is given in this work. Special attention is given to pelletizing and the influence of mineralogical characteristics of different ores on the production and final properties of iron ore pellets.  相似文献   
7.
设计了年产20kt聚丙烯造粒装置上游配料及计量加料系统、PID控制方案以及关键设备的选型.  相似文献   
8.
ABSTRACT

Organic binders have been used to replace bentonite in the pelletizing process of iron ore. In this research, colloidal agents were evaluated in a pelletizing process comparing their influence with the behavior of Peridur® and bentonite. Bench tests were carried out to identify the effects of binders and dispersant on the dispersion degree of mixtures, and their influence on the liberation/flocculation of fine particles. The results show that the dispersant acts on the fine particle content of the iron ore by removing ultrafine particles that are adhered to the surface of coarse particles, making the ultrafine available to the medium.  相似文献   
9.
某难选铁矿石压球-直接还原-磁选试验   总被引:2,自引:1,他引:1  
魏玉霞  孙体昌  肖宝清  寇珏  余文  蒋曼 《金属矿山》2012,41(3):70-73,77
以某低品位复杂难选铁矿石为对象,研究了压球-直接还原-磨选工艺影响因素和机理。结果表明,将破碎至-4 mm的矿石与0.5%的黏结剂、10%的水和20%的内配煤M3混匀,在压力为190 kN时压制成φ30 mm×20 mm的压球,在1 200 ℃下还原40 min,焙烧球碎磨至-43 μm占85%,经磁场强度均为88 kA/m的1粗1精弱磁选流程处理,最终获得了铁品位为91.44%、回收率为90.85%的直接还原铁产品,可直接作为炼钢的优质原料。  相似文献   
10.
Cobalt-manganese catalyst is widely studied in Fischer-Tropsch synthesis to obtain light olefins from synthesis gas. However, selectivity and mechanical strength of the catalyst differ depending on its preparation method and type of reactor. The main objective of this paper is to develop a better understanding of manufacturing parameters affecting attrition strength and selectivity of the catalyst. The cobalt-manganese oxide nano-catalysts were prepared using co-precipitation method. The fine powders were then formed using tabletting-crushing (pelletizing) process to obtain the catalyst pellets. The original unformed and formed catalysts were explored for the conversion of synthesis gas to the light olefins in a standard laboratory fixed bed reactor considering selectivity to ethylene and propylene. The processing variables investigated were included of type and concentration of binder and compression pressure in pelletizing process. Furthermore, the attrition assessment of catalyst was carried out using a rotary bottle shake system. The results presented in this work revealed that forming the catalyst under 75 bar compression pressure and 4 wt.% Syton binder led to the maximum selectivity. In the attrition evaluation, it was found that the extent of attrition was the least at the same forming conditions (75 bar, 4 wt.% Syton).  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号