Advanced Materials Research Vols. 581-582

Abstract: The hot metal fed converter in Panzhihua Steel Company is characterized by high sulfur content of 0.085% and high phosphorus content of 0.133%. Under this condition, some technologies like control of sulfur and T[O] content, ladle slag optimization, calcium treatment and protective casting were used in practice, and the desired result of T[O] as low as 0.0014% and sulfur content of 0.0023%was achieved, which met the cleanness requirements by anti-HIC X65 tube steel. With the help of inclusion control technology, grade of inclusions in as-cast steel was less than 0.5. In addition, total amount of inclusions was only 0.0044% which dispersed in slab in form of small spherical particle.

Abstract: Microimpurities are introduced by CZ of SiGe alloy, by studying the possibility of using hydrometallurgical route to refine SiGe alloy, different influencing factors were investigated, and the samples were characterized by SEM, ICP etc. When SiGe alloy particles are leached at appropriate conditions: the size 100-400μm, the mol fraction of HCl 2mol/l, reaction time 8h, reaction temperature 40°C, Impurities mass fractions of Fe, Al, Ca could be reduced to 4.14ppmw, 18.30ppmw, 78.99ppmw, the removal ratio are 99.23%, 84.36%, 34.18%, and the impurity content is reduced to about 100ppmw.

Abstract: Connected features of iron and steel consumption in whole process of steelmaking in PanGang, by reducing the iron loss of desulfurization and vanadium extracting, reducing content of TFe of terminal slag in converter steelmaking, and reducing iron and steel consumption of continuous casting, the iron loss of desulfurization and vanadium extracting is reduced to 5.21% from 5.39%, and the content of TFe of terminal slag is reduced to 19.47% from 21%. Iron and steel consumption in whole process reaches to 1145.45 kg/t steel which is reduced effectively.

Abstract: Through the adjustment of desulfurizer in KR desulfurization process, the efficiency of desulfurization is increased obviously on condition of maintaining the same KR desulfurization process. While the desulfurization rate is as high as 84.2% and this is 3.2% higher than that before optimization. Consumption of desulfurizer is 12.3kg/t hot metal on average which is 1.4kg/t hot metal than that before optimization. In addition, TFe content in desulfurizing slag is 10.4%, which is reduce by 3.25% of the value before optimization. There is nearly the same content of carbon and vanadium in hot metal. The optimized desulfurizer can be used in KR desulfurization process, and wonderful results have been gotten. Therefore, it has a good prospect of application.

Abstract: Leaching test on the Oxidized Copper Ore coming from Dishui, XinJiang Province is studied in the NH4CO3-H2O system；Systematic studies are made to show the effects of various factors on the leaching rate of copper. The optimum conditions for leaching is finally confirmed, namely the grinding size is 85% of -0.074mm, concentration of Ammonium carbonate 2mol/L, temperature 45°C, solid to liquid ratio 3:1, stirring intensity 300r/min and leaching time 1.5h. Ultimately, the leaching rate of Cu could reach more than 87%.

Abstract: This study through a lot of theoretical analysis and experimental exploration, come to add phytic acid and chromium alum in the traditional zinc phosphating solution for phosphating solution film-forming speed and improve the film density has a distinct effect, and further by orthogonal experiments and the final assessment of preferred a group of environmental, low-temperature, and no sediment of new phosphating process. The composition of the phosphating solution is as follow: zinc oxide 0.5g/L; phosphating acid 5.0mL/L; tartaric acid 0.75g/L; sodium molybdate 0.6g/L; Ma Jif salt 2.0g/L; NaF 0.25g/L; phytic acid 0.4mL/L; chromium alum 1.0g/L; free acidity 2-4 points; total acidity 15-18 points. The experimental results show that: the new phosphating process of this study reduces the handling costs, the stability bath performance, little changes in acidity, in the case of do not need to adjust the surface at room temperature, to forming a completed, dense, strong corrosion-resistant color phosphate crystal film on metal surface within 5 minutes, the copper sulfate bit time is 2.5mins, with good adhesion to 0, the impact resistance is 50kg/cm, it can be used in conjunction with a variety of coating processes.

Abstract: Titanium concentrate and titanium slag were used to prepare high titanium ferroalloy to reduce cost. In the process, the 6-9% of aluminum consumption was replaced by magnesium. The reasonable slag system composition was used. The results indicate that the ferrotitanium of 75% [Ti] and [Al]<4% was prepared.

Abstract: The ore is the oxide ore of Copper lead and zinc, The ore has high Oxidation rate of Pb,nearly 50%. which contains 3.56% of Pb,3.86% of Zn,0.209% of Cu. The flotation flowsheet consisting of the scene is “Part of the mixed flotation—inhibitor Zn and Pb-Cu mix flotation—Zn flotation—Cu-Pb separation”. But the Cu-Pb separation was not effective. After trials, we eventually developed the flotation process--that is once rough concentration、cubic concentration and twice scavenger concentration， the process can obtain copper concentrate which contains 17.87% of Cu,7.63% of Pb,and lead concentrate which contains 2.67% of Cu,53.93% of Pb.

Abstract: To get basic information on corrosion of metals under sewage sludge environment, in this work, the corrosion behavior of SAE1045 steel under SiO2 gel with 3 wt% NaCl was investigated by electrochemical polarization method. The results show that the self-orrosion potential of the steel move to more negative value in SiO2 gel comparing to those in aqueous solution. It was found by SEM and EDX measurements that, after 15 days of wilhelmy test in SiO2 gel, a dense covering layer containing a lot of Si appeared on the surface of steel, which was attributed to the difference of corrosion behavior for the metal under SiO2 gel and aqueous solution.

Abstract: This study reached a gold ore which contain 3.83g/t gold, to investigate the available gold recover methods, direct cyanide leaching test and “biooxidation-cyanide” leaching process were utilized after enrich gold by flotation. When regrinding the flotation concentrate to 95% -325mm, the leaching rate of “biooxidation-cyanide” leaching reached 94.47%, compare with direct leaching, the leaching rate increased almost 67%. Obviously bacterium oxidation is a useful pretreatment for gold leaching.