Effect of Biochar as Reductant on Magnetizing-roasting Behavior of Pyrite Cinder

The effect of biochar substituted for anthracite as reductant on magnetizing-roasting pyrite cinder was investigated.The key of magnetizing-roasting is the gasification reaction between reductants and CO2.Since biochar could react with CO2 more rapidly at lower temperature,the reactivity of biochar is better than that of anthracite.The gasification of biochar could produce reducing condition ofφCO/(φCO+φCO2)about 10%-20% between 700-800 ℃,which is in accord with the atmosphere and temperature of Fe2O3 reduction.So it is beneficial to the reduction of iron mineral of pyrite cinder.Compared with anthracite,biochar could decrease the roasting temperature from825 to 750 ℃ and roasting time from 20 to 15min,which shows that a better effect of magnetization could be obtained in the condition of lower temperature and shorter time.Using biochar as reductant,iron concentrate extracted from pyrite cinder as about 64%iron grade could be produced,and the recovery is over 90% under the condition of above 90% grinding particle less than 0.045 mm and magnetic intensity of 0.124-0.194 T.     

高浓度钢渣粉尘环境发动机空气过滤系统的改进与维护

针对液压挖掘机在高浓度钢渣粉尘作业环境下,钢渣粉尘对发动机的损害,分析了发动机空气滤清器的作用,阐述了传统空气过滤系统存在的问题,提出了改进的方案与维护措施.     

Effect of supports on the redox performance of pyrite cinder in chemical looping combustion

Chemical looping combustion (CLC) is a clean and efficient flame-free combustion technology,which combust the fuels by lattice oxygen from a solid oxygen carrier with inherent CO2 capture.The develop-ment of oxygen carriers with low cost and high redox performance is crucial to the whole efficiency of CLC process.As the solid by-product from the sulfuric acid production,pyrite cinder presented excellent redox performance as an oxygen carrier in CLC process.The main components in pyrite cinder are Fe2O3,CaSO4,Al2O3 and SiO2 in which Fe2O3 is the active component to provide lattice oxygen.In order to sys-tematic investigate the functions of supports (CaSO4,Al2O3 and SiO2) in pyrite cinder,three oxygen car-riers (Fe2O3-CaSO4,Fe2O3-Al2O3 and Fe2O3-SiO2) were prepared and evaluated in this study.The results showed that Fe2O3-CaSO4 displayed high redox activity and cycling stability in the multiple redox cycles.However,both Fe2O3-Al2O3 and Fe2O3-SiO2 experienced serious deactivation during redox reactions.It indicated that the inert Fe-Si solid solution (Fe2SiO4) was formed in the spent Fe2O3-SiO2 sample,which decreased the oxygen carrying capacity of this sample.The XPS results showed that the oxygen species on the surface of Fe2O3-CaSO4 could be fully recovered after the 20 redox cycles.It can be concluded that CaSO4 is the key to the high redox activity and cycling stability of pyrite cinder.     

德士古气化炉的提温操作

通过更换煤种使生产消耗得到了大幅度降低，生产能力得到了较大的提高，但渣中可燃物较设计指标提高了2－3倍，为此进行了提高炉温的试验，考察渣中可燃物随炉温的变化关系，则时考核不同渣中可燃物含量下的氧耗和煤耗。     

用硫铁矿焙烧粉尘制硬质塑料管的研究

用硫酸厂硫铁矿焙烧后的粉尘掺入聚氯乙烯中，用挤出成型法挤制硬质聚氯乙烯塑料管，以扩大聚氯乙烯塑料的用途。     

铸钢车轮气孔、夹渣缺陷产生的原因与防止措施

分析了铸钢车轮件气孔、夹渣缺陷的形成原因,提出了相应的解决措施,并在生产中得到验证,使废品率显著下降。     

磷酸铵产品防结块的新措施

介绍了一种磷酸铵产品防结块的途径，通过将硫铁矿制酸中产生的废渣，添加在磷酸铵料浆中改善料浆黏性，在解决磷酸铵类肥料结块的同时，使得产品中W（H：O）≤3．0％，总养分不低于58％，满足产品的国家标准规定，实现了硫铁矿制酸装置废物用于磷酸铵装置产品防结块的循环利用。     

防护工程中喷射煤渣混凝土密实回填应用探讨

基于防护工程施工中密实回填施工效率低、费用高的实际,从煤渣混凝土的性能分析入手,研究了喷射煤渣混凝土施工工艺和方法步骤,以利用煤渣混凝土喷射施工的特点提高回填作业效能。试验及实用证明,用喷射煤渣混凝土进行回填是提高施工效率的有效方法,对提高防护工程密实回填质量、改善工程结构强度、增强工程防护性能具有重要意义。     

添加生物基质对地下渗滤系统污水处理效果的影响

构建了以土壤-煤渣分层装填的1#及土壤-煤渣-生物基质分层装填的2#两套地下渗滤系统(SWI)模拟装置,考察生物基质对SWI污水处理效果的影响。水力负荷为10 cm/d时,监测两装置进出水中COD、总磷、氨氮和总氮的变化情况。结果表明:当系统运行稳定后,装置处理效果显著,出水水质均可达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)中的一级A标准,1#装置对COD、总磷、氨氮和总氮的去除率分别为89.75%、99.65%、93.66%、74.94%,2#装置分别为92.28%、99.85%、92.78%、84.49%。2#装置对TN的去除率较1#装置要高,添加生物基质可强化系统对TN的脱除能力。