Upgrading the value of BOS slag by addition of difficult to recycle glass or slags

综合路线的炼钢炉渣，即从高炉铁水中提炼出来的炉渣，经过去金属、粉碎和筛分后，用来铺筑道路顶层沥青路面。它在英国的上升速度约为500ktpa。然而，对于高等级路面来说，它的抗滑能力还不够高。对于这些地点，原生骨料必须进口，并伴随着对采石和运输环境的影响。从炼钢容器中取出炉渣后，对炉渣进行改性以增加二氧化硅含量，应能提高炉渣的抗滑性，使其达到高等级路面所要求的水平。炉渣改进剂可以是工艺路线中其他地方产生的炉渣，例如没有现成用途的脱硫渣。其他可能的改性剂来源是玻璃工业产生的某些废流，包括被集料、混合颜色和细粉污染的废流，这些废流不能返回到工艺中，以及产生耐火废物的高二氧化硅。因此，本项目的目标是利用钢铁行业产生的矿渣，以及玻璃行业产生的废玻璃和耐火材料，这些都没有现成的回收途径，来改性炼钢过程中产生的矿渣。这将产生更高价值的集料替代。该项目将通过利用现有的炼钢炉渣并用多种替代的高硅源进行改性，生产出许多公斤级的新炉渣。将使用热力学模型来确定混合物，以实现矿物学目标。将对炉渣进行测试，以评估抗滑和耐磨性能的改善。最有希望的混合物将在全面的工厂试验中生产，然后将进行进一步测试。由于成本和时间的原因，任何新矿渣的现场试验，即试验路面，都必须在项目之外进行。该项目的第二项活动是对玻璃行业和钢铁厂内部产生的废物或难以再利用的适当材料的数量和价值进行详细评估，以确定用作矿渣改进剂的潜力。

Steelmaking slag from the integrated route, ie made from blast furnace hot metal, is demetalled, crushed and screened, and used to create tarmac for the top surface of roads. Its rate of arising in the UK is around 500ktpa. However, it's skid resistance is not high enough for the top grade of road surface. For these locations, virgin aggregate has to be imported with its associated quarrying and transport environmental impact. Modifying the slag to increase the silica content after it is tapped from the steelmaking vessel should improve its skid resistance to the level required for the top grade of road surface. The slag modifier could be slags arising elsewhere in the process route, such as desulphurisation slag, for which there is no ready use. Other likely sources of modifier are certain streams arising from the glass industry, including waste streams contaminated by aggregates, mixed colours, and fines, which cannot be returned to the process, and high silica arising refractory waste. Thus this project objective is to use slag arising within the steel industry, and streams of waste glass and refractory from the glass industry, all of which have no ready recycling route, to modify the slag from the steelmaking process. This will then produce an aggregate replacement of higher value.The project will make a number of new slags, at the kg scale, by taking existing steelmaking slag and modifying with a number of alternative high silica sources. Thermodynamic modelling will be used to define the mixtures to achieve the aim mineralogy. The slags will be tested to assess the improvement in skid resistance and abrasion resistance. The most promising blend will be produced in a full scale plant trial and will then be further tested. Any field trial of the new slag, ie a trial road surface, must fall outside the project due to the cost and timescale.The second activity of the project is to undertake a detailed assessment of the volumes and values of waste, or difficult-to-reuse, streams of appropriate material from within the glass industry and the steel works to determine the potential for use as a slag modifier.