The Study on Smelting Ti-Si Ferroalloy by DC Electrothermal Process Using PISC Blast Furnace Titaniferous Slag

The new process for semiting Ti-Si ferroalloy using Panzhihua Iron & Steel Company (PISC) blast furnace titaniferous slag is introduced. The reduction and impoverishment law of TiO2 in slag and the effects of DC on smelting Ti-Si ferroalloy are studied when smelting Ti-Si ferroalloy by electrosilicothermal method,Ti-Si ferroalloy containing about 20% Ti can be produced by electrosilicothermal method. and Ti recovery rate is less than 60 %. And then, electrosilicoaluminothermal method is developed, by which Ti-Si ferroalloy containing Ti more than 30% and Si less than 35 % can be produced, and Ti recovery rate is higher than 80%. Ti-Si ferroalloy can replace TiFe martially in steelmaking,and residue slag can be used to make cement.     

A Study Raising the Grade of Silico-titanium Ferroalloy

It is studied in this paper that the influences of various factors,such as the smelting temperature,the basicity of the slag,and the quantity of reductant on the titanium content of alloy,silicon content of alloy,TiO2 content of the remaining slag and the titanium recovery in smelting silico-itanium ferroalloy using silicoaluminium ferroalloy as reductant.With this study,the optimum techn ological parameters are obtained of raising the titanium content of alloy and re-$$$ucing the silicon content of alloy. The stable experiments in laboratory and factory using this opti-mum technological parameters are conducted.     

Development in Research Rheological Characteristics of Non-newtonian Metallurgical Molten Slags

Most of the former study for metallurgical molten slags (MS) was on the assumption that MS is newtonian fluid, and show lots of limitation. For the reasons such as the existence of gas-liquid phase points, MS shows a property of non-newtonian fluid. For this reason, the advances in some areas are conducted, including the measurement method, the factors influencing the MS and the viscosity computed models, which is prepared for the further research of the physical-chemical properties of blast furnace slag bearing titania.     

Hydraulic potential stimulation and bricks preparation of magnesium slag

The hydraulic potential stimulation of magnesium is significant to its direct utilization. In this paper, magnesium slag which is the main material, and some slag and activator are used to prepare cementitious material and bricks, and the influences of different activators on the hydraulic properties are also investigated. Experiments show a certain hydraulic potential of magnesium slag but with a low strength, however, the compressive strength soars from 1.8 MPa to 27 MPa after composing it with a small amount of blast-furnace slag. The early strength of magnesium slag-blastfurnace slag binder is affected by NaOH, while the gypsum affects the binder’s later strength. Bricks conforming to standard MU20 are successfully fabricated by 80% magnesium and 20% blast furnace slag, after activated, with extra 5% desulfurized gypsum.     

两种先锋植物对铅锌废渣生境改善及重金属迁移的影响

为了研究自然定居的先锋植物对铅锌废渣的生态修复效应,通过野外采样及室内分析,研究了典型的黔西北土法炼锌废渣堆场上自然着生的2种先锋植物(土荆芥及类芦)对废渣基质养分积累、酶活性改善状况,并分析了2种先锋植物生长对炼锌废渣中特征重金属Cu、Cd、Zn、Pb的吸收积累特征及先锋植物根际微域中重金属赋存形态的影响。结果表明,与对照(无植被修复的裸露废渣)相比,自然定居在铅锌废渣堆场上的土荆芥和类芦可显著(P0.05)改善植物根际废渣基质的养分(N、P、K、有机质)、酶活性(碱性磷酸酶、脲酶、蔗糖酶、过氧化氢酶)及微生物活性(呼吸作用强度);2种自然定居植物对Cu、Cd、Zn、Pb的赋存形态特征具有明显影响,植物生长促进根际废渣基质中残渣态Cu、Cd、Zn、Pb向可交换态转化进而增加废渣基质中重金属的生物有效性。土荆芥对Cu、Cd、Zn、Pb和类芦对Cu、Zn、Pb的转运系数均小于1,但类芦对Cd的转运系数达到2.02,表明类芦对Cd具有较强的吸收转移能力;两种植物均能在极端的废渣环境中生长,表现出对铅锌废渣较强的耐性和抗性。土荆芥和类芦的自然定植及生长对土法炼锌废渣堆场重金属污染有一定的修复作用,可作为先锋优势植物应用于铅锌废渣植被重建或生态修复工程实践的前期修复工作中。     

棉渣堆肥过程理化性质变化及腐熟度评价

对新疆特色农业废弃物棉渣进行堆肥化处置,以牛粪为调理剂,采用人工翻堆的方法进行高温好氧堆肥试验,研究添加牛粪对棉渣堆肥发酵的影响,探讨堆肥过程中不同部位物料理化性质的差异,并依据发芽指数(GI)评价物料的腐熟程度。结果表明,添加牛粪可以加速物料升温,提高主发酵温度,缩短发酵时间,添加牛粪处理的T值(终点C/N与初始C/N之比)比对照组提前12 d降到0.6以下,且发酵后GI较高,对植物毒性较小。不同部位温度的变化,以中层升温最快,温度最高。中层总有机碳(TOC)下降速率和总氮(TN)上升速率最快,深层次之,表层最慢。深层易形成厌氧区,物料腐熟较慢,堆肥腐熟之前深层GI最低,完全腐熟之后各层之间理化性质无显著差异。     

A Primary Investigation on Concrete Made from Iron and Steel Slags for Building Ecological Artifical Reefs

A method of orthogonal test was used to optimize the strength of the cementitious material for preparing the concrete of high-strength artifical reefs.The results show that with the ratio of iron slag:steel slag=7:1,and when 10% cement clinker and 10% gypsum of Flue Gas Desulfurization Waste (FGDW) was mixed with 80% iron and steel slags powder,the mixed cementitious material had an optimized strength.The optimized specific surface area are 480 m 2/kg and 550 m 2/kg for iron slag and steel slag powder respectively.The ordinary portland cement can be totally substituted by such a mixed cementitious material with iron and steel slags as its major components in preparing the concrete for building high-strength artificial reefs.A concrete with a compressive strengh over 65MPa can be prepared by using such a mixture as a cementitious material and steel slag grains as its fine and coarse aggregats which have been stubilized by a hot-simmering method. Hydration processes of net slurry were analysized by XRD and SEM methods. The results show that the hydration products in the system are mainly AFt and C-S-H gel. The results also show that the pozzolanic reaction of iron slags could be largely promoted by the coordinations of steel slags,clinker and FGDW.     

钢渣制取硅钾肥的缓释性分析

通过变化"脱硅渣改性制取长效硅钾肥工艺"中影响硅钾肥缓释效果的各因素的水平,在水和柠檬酸溶液中分别测定酸性制得的硅钾肥中钾的溶出率。进而通过对实验数据做统计回归分析,并结合Trenkel提出的缓释肥标准,对改性后脱硅渣的缓释性进行了初步分析。结果表明,脱硅渣在各种实验条件下改性制得的硅钾肥均具有明显的缓释性;钾在水中的溶出率小于其在柠檬酸溶液中的溶出率。     

模拟降雨条件下弃渣体边坡不同防护措施的减水减沙效益

采用野外人工模拟降雨方法,以未防护弃渣体边坡为对照,研究了1.0、1.5 mm min-1降雨强度条件下神府矿区种草和鱼鳞坑措施对偏土质、偏石质和煤矸石弃渣体产流产沙的调控作用。结果表明:(1)不同措施下3种弃渣体边坡径流率均在产流6~9 min后趋于稳定,产流过程中弃渣体边坡侵蚀速率均呈波动减小趋势,且未防护坡面减小趋势较防护更明显。(2)植草对偏土质、偏石质、煤矸石弃渣体减水和减沙效益分别为42.91%~51.21%、26.28%~55.20%、1 0.3 3%和9 7.5 4%~9 7.9 5%、4 1.8 7%~4 2.2 6%、7.8 0%;鱼鳞坑的减水和减沙效益则分别为:51.89%~72.72%、22.37%~42.92%、21.32%和98.41%~99.30%、94.90%~91.84%、39.50%。(3)鱼鳞坑措施对偏土质弃渣体的减水和减沙效益较种草分别提高8.98%~21.51%和0.46%~1.76%;种草措施对偏石质和煤矸石弃渣体的减水和减沙效益较鱼鳞坑措施分别提高3.91%~12.28%和0.28%~3.06%及10.99%和31.70%。(4)3种未防护弃渣体的侵蚀速率和径流率呈显著线性关系,种草和鱼鳞坑措施改变了坡面水沙关系,侵蚀速率和径流率相关性减弱或无显著关系。研究结果可为矿区弃渣体边坡生态恢复措施布设提供科学指导。     

上吸式气化炉木屑气化结渣特性

为了探索上吸式气化炉内木屑气化结渣形成的原因与机理,在自制的上吸式生物质气化炉上通过控制气化条件形成结渣,分析了结渣形成的工况与部位,并对渣样进行了详细的表征.结果表明:随着入炉空气量的增加,气化炉内氧化区的温度急剧增加,气化强度显著增大,当入炉窄气量超过3.5 m3/h时,气化强度高达112.7 kg/m2·h),氧...