炉渣对调节稻田土壤pH和盐度的有效性分析

对炉渣调节稻田土壤pH和盐度的有效性进行研究。结果表明,稻田土壤pH和盐度随着炉渣施用量的提高而增大,并表现为炉渣施用后显著提高了稻田土壤的pH(P0.01),但对盐度的影响不显著(P0.05),不同土壤层次之间pH和盐度的差异性随着施用量的提高而减小。     

福建煤矿边坡与重力式挡土墙设计探析

本文根据福建煤矿地处山区，地形地貌较为复杂的特点，结合笔者多年从事福建煤矿总图设计的经验，探析在不同的地形地貌和地质条件下，如何因地制宜，采取不同的方法对福建煤矿边坡和重力式挡土墙进行经济合理的设计。     

湘潭锰矿废弃地土壤重金属污染及其评价

对湘潭锰矿废弃地土壤中Ni、Cd、Cu、Mn、Pb和Zn的含量进行了测定分析,并采用污染指数评价法对矿区废弃地土壤重金属的污染程度进行了评价.结果表明:湘潭锰矿矿区废弃地土壤中Mn、Cu、Pb、Zn 、Cd、Ni的平均含量分别为:8 853.21、95.80、1 211.29、685.36、13.15和91.33 mg/kg;用3种不同的背景值对废弃地土壤重金属污染程度的评价结果是一致的,6种重金属元素的单项污染指数均大于2,表示被污染,其中以Mn、Pb、Cd污染最为严重;综合污染指数均大于3,达5级为重污染.     

Using Electro slag Melting Process of Cast Molten Iron To Produce Ductile Cast Iron

This paper introduces experimental results of the ESM of cast iron in the laboratory and pilot plant based on predecessor's work by molten CaF 2-based slag systems containing MgO , CaO and RexOy. The results show that the desulfurization ,inclusion removal and gas elimination of the ESM have obvious effects on making iron liquid purified and producing high quality casting ,and indicate that the ESM of cast iron may essentially improve the traditional process of cast molten iron melting as a new technique for making high quality ductile cast iron.     

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.     

PHASE ANALYSLS OF LOW-VALENCE TITANIUM IN SLAG CONTAINING HIGH TITANIUM

Hcl is used to remove MF4, Fe2O3 and part of FeO. The residue is dissolved by H2SO4-HF-H3PO4. Then, NH4Fe(SO4)2 is added to oxidate low-valence titanium and the standard solution of K2Cr2O7 is used to titrate Fe2+. The amount of total iron minus the amount of iron which has been removed, so that the amount of residue Fe2+ can be adjusted. This method has many advantages such as simplicity, rapidity repeatability.     

Vanadium extraction from molten vanadium slag with high contents of Ca and P by direct oxidation and adding Na2CO3 and water leaching method

The mineral phases of the clinker obtaining after oxidizing vanadium slag with high contents of Ca and P are analyzed by X-ray diffraction (XRD), and the experimental parameters of vanadium extraction are also investigated in this paper. The results show that V exists in the form of Na4V2O7, Na3VO4, Na1.33V2O5 and NaCaVO4 when the amount of added Na2CO3 is relatively small (35%). But, with the added Na2CO3 amount increasing, Na4V2O7 and NaCaVO4 react with Na2CO3, then change into Na3VO4. P in the clinker exists in the form of Na3PO4. The leaching rate of vanadium can reach above 90% under the conditions: added Na2CO3 amount of 40%, liquid to solid ratio of 5∶1 mL/g, leaching temperature of 90℃, leaching time of 4 min, stirring rate of 150 r/min. Therefore, the method of extracting vanadium from molten vanadium slag with high contents of Ca and P by direct oxidation and adding Na2CO3 and water leaching is feasible.