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

来自综合路线的炼钢渣，即由高炉铁水制成的，经过脱金属、粉碎和筛选，用于为道路的顶部表面建造柏油路面。其在英国的增长率约为500ktpa。但其抗滑性能不足以满足高等级路面的要求。对于这些地点，必须进口原生骨料，并对其相关的采石和运输环境造成影响。从炼钢炉中出钢后，对炉渣进行改性以增加二氧化硅含量，应将其抗滑性提高到路面最高等级所需的水平。炉渣改性剂可以是在工艺路线中的其他地方产生的炉渣，例如没有现成用途的脱硫炉渣。改性剂的其他可能来源是来自玻璃工业的某些流，包括被骨料、混合颜色和细粉污染的废物流，其不能返回到工艺中，以及高二氧化硅产生的耐火废物。因此，本项目的目标是利用钢铁工业产生的炉渣，以及玻璃工业产生的废玻璃和耐火材料流，所有这些都没有现成的回收途径，以改变炼钢过程中产生的炉渣。这将产生更高价值的骨料替代品。该项目将通过利用现有的炼钢炉渣并使用一些替代的高硅来源进行改性，以千克级制造一些新炉渣。热力学模型将用于定义混合物，以实现目标矿物学。将对炉渣进行测试，以评估抗滑性和耐磨性的改善。最有前途的混合物将在一个全面的工厂试验中生产，然后将进一步测试。由于成本和时间表的原因，新炉渣的任何现场试验（即试验路面）都必须在项目之外。该项目的第二项活动是对来自玻璃工业和钢铁厂的废物或难以再利用的适当材料流的数量和价值进行详细评估，以确定用作炉渣改性剂的潜力。

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.