首钢烧结配加扬地粉试验研究

介绍了首钢原料条件下配加扬地粉对烧结生产影响的实验室研究.随着扬地粉配入量的增加,烧结矿转鼓强度、成品率改善,燃耗有少量上升,利用系数增加,低温还原粉化指数变差.研究结果表明:在首钢目前条件下,配入10%～20%的扬地粉是可行的.二烧车间进行了扬地粉工业试验,其最高配比达到30%,工业试验时烧结各项指标变化与实验室试验结果基本一致.     

南非粉矿的烧结试验研究

对外购南非KUMBA公司Sishen矿山的粉矿进行了物相和理化性能的分析，以及烧结性能和烧结矿冶金性能的研究，并与武钢使用的其他进口粉矿进行了比较，通过试验找出了该矿的烧结特性和适宜的工艺参数。     

Effect of cooking on total vitamin C contents and antioxidant activity of sweet chestnuts (Castanea sativa Mill.)

In this work the total vitamin C contents (ascorbic acid + dehydroascorbic acid) and antioxidant activity of raw and cooked chestnuts was evaluated. The vitamin C contents of raw chestnuts varied significantly between the different cultivars (cv) studied and it varied from 400 mg/kg dry weight (cv Lada) to 693 mg/kg dry weight (cv Martaínha). The different cultivars behave differently during the cooking process concerning the loss of vitamin C. A significant decrease in the vitamin C content of the chestnuts was observed, 25–54% for the boiling process and 2–77% for the roasting process. Boiled and roasted chestnuts can be good sources of vitamin C since it may represent 22.4%, 16.2%, 26.8% and 19.4%, respectively, of the recommended dietary intake for an adult man and woman. The cooking process significantly changed the antioxidant activity of the chestnuts. A difference was observed between the cultivars during the cooking processes, concerning the antioxidant activity. For the raw chestnuts the variation in vitamin C content of the chestnuts explains 99% of the antioxidant activity variation but for the roasted and boiled chestnuts this percentage significantly decreases to 51% and 88%, respectively. Although a high antioxidant activity is still present in the cooked chestnuts, the cause for this antioxidant activity is less dependent on the vitamin C content of the chestnuts, probably due to the conversion of ascorbic acid to dehydroascorbic acid. The increase in gallic acid during the cooking process, presumably transferred from the peels to the fruit, also contributes to the high antioxidant activity observed for the cooked chestnuts.     

莱钢烧结生产条件下FeO含量影响因素的研究

烧结矿中氧化亚铁含量是评价烧结生产的一项综合性指标,它反映烧结过程的动态控制状况,它与烧结矿的转鼓强度、低温还原粉化率、还原性的相关性很大,是影响高炉炉况顺行的一个重要参数。近年烧结生产条件与工艺制度发生很大的变化,对影响FeO含量的因素进行实验研究,旨在寻求FeO最佳控制范围,提高烧结矿产质量,降低能耗,改善冶金性能。     

莱钢烧结生产条件下 FeO 含量影响因素的研究

烧结矿中FeO含量是评价烧结生产的一项综合性指标,它反映烧结过程的动态控制状况,它与烧结矿的转鼓强度、低温还原粉化率、还原性的相关性很大,是影响高炉炉况顺行的一个重要参数。近年烧结生产条件与工艺制度发生很大的变化,对影响FeO含量的因素进行实验研究,旨在寻求FeO最佳控制范围,提高烧结矿产质量,降低能耗,改善冶金性能。     

焦粉粒度对济钢烧结矿质量的影响

生产表明,在济钢二烧高碱度(R＝2.4)烧结矿生产的条件下,烧结矿RDI性能与其FeO含量有一定的相关关系.为了保证烧结矿中的FeO含量,又不致增加焦粉消耗,进行了焦粉粒度、混合料水分、风门开度等因素的相关试验.根据试验结果我们对焦粉粒度进行了优化, 并取得了良好的效果.     

喷洒CaCl2溶液降低烧结矿RDI有效期的试验研究

通过对喷洒过ＣａＣｌ２溶液的烧结矿经浸泡和淋雨后的低温还原粉化试验,一方面研究了落地烧结矿表面氯化钙的有效期问题;另一方面也结合试验数据和烧结矿低浸粉化的机理,探讨了烧结矿喷洒ＣａＣｌ２溶液后其ＲＤＩ降低的机理。     

Effect of CaCl_2 on RDI and RI of Sinter

 On the premise of maintaining the reducibility of sinter unchanged, it is of great significance to reduce the RDI of sinter, which will improve the permeability of blast furnace burden column, so as to realize stable and smooth performance, and keep high yield and low consumption. Under laboratory conditions, a study was proposed on the RDI and RI of sinter, which was immersed with different types and concentrations of solutions. The results show that Cl- is the main factor for reducing the RDI of sinter, and the RDI and RI of sinter decrease with the increase of Cl- concentration. With comprehensive consideration of the RDI and RI of sinter, when the concentration of Cl- is 2%, the RDI of sinter will be significantly reduced and RI will not be affected. In order to study the mechanism of CaCl2 effect on the RDI and RI of sinter, analysis based on the methods of IR Spectra, SEM and chalcography was adopted.     

Iron Ore Sintering: Quality Indices

Sinter plants process a mixture of iron ore fines, recycled ironmaking products, slag-forming agents and solid fuel (coke) with the finality of obtaining a product with the suitable characteristics (thermal, mechanical, physical, and chemical) for being fed to the blast furnace. With this objective a series of parameters are defined, including the nature and composition of each component of the mixture, and the conditions of the sintering process. Sinter characterization includes chemical and granulometric analysis, determination of the mineral phases in its structure, apart from a series of quality indices that includes reducibility, low temperature degradation, reduction degradation and Tumbler. Operated sinter plants with the maximum productivity are also important with the purpose of obtaining a sinter with uniform composition and quality for facilitating the steady state operation of the blast furnace.     

Sintered Ore Sprayed by Acid and Alkaline Waste Water Resulted From Cold Rolling

 In order to prevent the powdering of a sintered ore from influencing the smooth operation of a blast furnace, the conventional way to deal with it is that the CaCl2 solution is prepared by tap water, and then the solution is sprayed onto the sintered ore for improving its RDI (low temperature reduction degradation index). The CaCl2 solution prepared by adding acid and alkaline waste water resulted from cold rolling is sprayed onto the sintered ore to improve its RDI. The values of RDI+6. 3 and RDI+3. 15 of the sintered ore which is sprayed by the CaCl2 solution with the CaCl2 concentration of 3. 5% (mass percent) are increased by 17. 5% and 11. 63%, but the index of RDI-0. 5 is decreased by 3. 1% when the spraying amount of the solution is making up 0. 5% of the total sintered ore sprayed in comparison with those of the sintered ore which is not sprayed by using the CaCl2 solution. Experimental results show that after the CaCl2 solutions prepared by adding the acid and alkaline waste water are sprayed on the sintered ore, RDI of the ore can be remarkably improved and therefore another way for recycling acid and alkaline waste water can be available, by which both cost for treating waste water and cost for producing a sintered ore can be decreased and environment is free of pollution by harmful substances in the waste water.