电弧炉炼钢合成渣的应用研究

试制并确定合成渣型,应用该渣进行了电弧炉炼钢工业试验;结果显示,应用该渣使电炉钢产量、品质及其他技术经济指标均有明显提高。     

Development of a new pH-swing CO2 mineralization process with a recyclable reaction solution

A new CO₂ mineral sequestration process using the pH swing of a weak base–strong acid solution was proposed. In this process, an alkaline-earth metal was extracted selectively from silicate waste material, such as steelmaking slag or waste concrete, in an acidic condition using a weak base–strong acid solution. The reacted solution containing alkaline-earth metal ions and a weak-base, behaves as a CO₂ absorbent. The acidic extraction solution was regenerated from the basic absorbent solution by precipitating the alkaline-earth metal with CO₂ as the carbonate. The thermodynamic analysis of this process shows that a series of reactions proceeds spontaneously and the overall reaction is exothermic. The feasibility of the proposed process was confirmed using steelmaking slag as a silicate material and ammonium chloride solution as a weak base–strong acid solution. It was confirmed that this series of reaction proceeds successfully under mild conditions. Calcium ions were extracted selectively from steelmaking slag using an ammonium chloride solution, and the reacted solution absorbed CO₂ followed by the precipitation of CaCO₃ at 80 °C. On the basis of these experimental analyses, the energy consumption of the proposed process was roughly estimated as 300 kWh/ton-CO₂.     

炼钢连铸动态调度方法及其应用

在炼钢连铸生产工艺约束条件下, 针对实际生产运行过程中存在的时间偏差、温度补偿、浇铸异常以 及钢种变更等多扰动问题, 单纯依靠手工调度还不能快速有效的达到计划的优化调度。提出了基于案例推理和人 机交互相结合的局部调整、基于分批规则的重调度的动态调度方法, 应用所提出的方法建立了动态调度架构, 设计 与开发了软件系统。该系统应用于国内某大型钢厂的生产调度, 实现了多扰动情况下的快速优化调整。     

石横特钢65 t Consteel电弧炉铁水热装的节能实践

石横特钢65t Consteel(连续加料熔炼 )电弧炉通过采用热装30%铁水 ,铁水温度不低于1300℃ ,同时优化供电制度、泡沫渣等工艺 ,冶炼电耗降低95kWh/t,氧气消耗降低28m³/t,冶炼周期缩短75min。     

Enriching Fe-bearing and P-bearing phases from steelmaking slag melt by super gravity

In this study, Fe-bearing phase and P-bearing phase were successfully enriched from the steelmaking slag by super gravity. After centrifugal enrichment, there was significant stratification presenting in the sample, the upper part was loose and porous, while the lower was compact and tight. With the help of scanning electron microscope (SEM) and X-ray diffraction (XRD), it was found that large quantities of particles for P-bearing phase gathered in the upper part and gradiently distributed along the direction of the super gravity, while the Fe-bearing phase mainly enriched in the lower part, and the enrichment efficiency was proportional to the centrifugal time and gravity coefficient. Under the gravity coefficient G?=?800, T?=?1663?K and t?=?40 min, the mass fraction of P₂O₅ in the P-bearing slag was up to 4.12%, and that of Fe_tO in the Fe-bearing slag was 35.17%. The recovery ratio of P₂O₅ and Fe_tO was up to 77.56 and 60.18%, respectively.     

The production and application of hydrogen in steel industry

Due to the increasingly serious environmental issues and continuous depletion of fossil resources, the steel industry is facing unprecedented pressure to reduce CO₂ emissions and achieve the sustainable energy development. Hydrogen is considered as the most promising clean energy in the 21st century due to the diverse sources, high calorific value, good thermal conductivity and high reaction rate, making hydrogen have great potential to apply in the steel industry. In this review, different hydrogen production technologies which have potential to provide hydrogen or hydrogen-rich gas for the great demand of steel plants are described. The applications of hydrogen in the blast furnace (BF) production process, direct reduction iron (DRI) process and smelting reduction iron process are summarized. Furthermore, the functions of hydrogen or hydrogen-rich gas as fuels are also discussed. In addition, some suggestions and outlooks are provided for future development of steel industry in China.     

CO_2-O_2混合喷吹炼钢烟尘形成机理的探索性研究

以CO2-O2混合喷吹炼钢烟尘为研究对象,利用Fe、Mn蒸汽压的不同,在铁水中添加Fe-Mn合金,以Mn作为示踪元素,通过研究熔池、烟尘中Mn含量和熔池与烟尘中Mn/Fe比,共同探索炼钢烟尘的形成机理。实验结果表明：CO2-O2混合喷吹使得炼钢烟尘中Mn的蒸发量增加且以废钢为原料的炼钢烟尘生成满足蒸发理论,以生铁为原料的炼钢烟尘生成是蒸发理论与气泡理论共同作用的结果。     

Use of Waste Bakelite as a Raw Material Resource for Recarburization in Steelmaking Processes

Bakelite is a thermoset plastic commonly found in electronic and automobile components. CaCO₃ is generally found in the polymer as a filler material. Since it cannot be remelted, the disposal of this material has become an environmental issue. The present study investigates a new route to utilize waste bakelite as a source of carbon in EAF steelmaking process. This paper reports the carbon dissolution behaviour of bakelite/coke blends into liquid steel at 1550 °C. The carbon pick up in the liquid steel after reaction with varying blends of bakelite/coke for 30 minutes ranged between 0.13 wt% to 0.17 wt%; these were generally higher than that observed from coke alone (0.1 wt%). The dissolution rate (K) was also found to improve and the observed trend was BK2 (0.045 × 10^?3 s^?1) > BK3 (0.023 × 10^?3 s^?1) > BK1 (0.005 × 10^?3 s^?1) > coke (0.003 × 10^?3 s^?1). The reaction products formed at the interface after 30 minutes of contact between liquid steel and bakelite/coke blends were observed to be a CaS‐Al₂O₃ complex. The presence of CaS in the interfacial layer due to the CaO in the ash, lowered melting temperature of the layer, thereby allowing for increased removal of the ash layer and greater carbon pick‐up. The CaO is formed from the decomposition of CaCO_3, and its presence was found to have a positive effect on modifying the properties of the coke, and thereby enhancing the carbon dissolution behaviour.     

炉外精炼方法在我国炼钢系统中的应用(1)

在简述我国炉外精炼发展及现状的基础上，着重叙述宝钢、武钢、鞍钢、马钢、攀钢、抚钢、太钢、冶钢、天津钢管公司、上海沪昌钢铁有限公司炼钢系统的炉外精炼技术应用状况。     

电弧炉兑铁水冶炼工艺的实验室试验

在１８０ｋＶ实验型直流电弧炉上进行了兑入０～５０％铁水冶炼工艺的试验研究，结果表明，每加入１０％的铁水可使冶炼时间缩短约６．７％，电耗降低５．５％，碳含量大于０．４％，脱碳速度可超过０．１％Ｃ／ｍｉｎ。