Value Recovery from Metallurgical Slags

冶金渣的价值回收

• 批准号: RGPIN-2017-06419
• 负责人: Barati, Mansoor
• 金额: $ 2.7万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=644605
• 关键词: Value; Recovery; Metallurgical; Slags

The metals extraction and recycling industries generate vast amounts of “slag”, a molten solution consisting of mostly oxides such as lime, silica and alumina. Traditionally, the material was regarded as a waste, and stored in piles or pits close to the smelting facilities. However, driven by the more stringent environmental regulations, need for resources, and economic factors, the recycling of slag has gained considerable attention and is partially practiced. The industry is however far from realizing all the value of metallurgical slags: minerals exceeding 600 million tonnes and thermal energy equivalent to 34 million tonnes of coal, each year. The present study aims at understanding and addressing some of the most critical challenges from fundamental perspective that would allow recovery of both the thermal and material values of slags by converting them to suitable materials for high value products. The research program explores the structural changes in the slags when they are cooled under various conditions, to allow their conversion to products such as cement feedstock and glass ceramics, and at the same time, transfer their thermal energy to another media. Additionally, the modification of slag by specific cooling conditions, addition of other materials, or oxidation/reduction will be investigated, aiming to recover of valuable elements from slag. Metallurgical slags have a very wide range of chemical composition. It is therefore the primary objective of this research program to understand the crystallization behavior of slag, as well as the speciation of different elements in slag in a very fundamental level. Such investigation is expected to establish correlations that would allow prediction of important parameters such as extent and rate of crystallization and mineral constituents of final slag from the initial composition and processing conditions (e.g. cooling rate, gas atmosphere, etc). The outcomes will be exceptionally significant for both creating a scientific knowledge base, as well as advancing industry's ability to realize all the value of slag and move towards more sustainable practices. The long term benefits are a cleaner metal extraction and recycling industry, reduced pressure on the earth resources, and training several graduate and undergraduate students with expertise in the fields of materials processing, waste treatment, and materials characterization.

金属提取和回收产业产生了大量的“炉渣”，这是一种熔融溶液，主要由石灰，二氧化硅和氧化铝等氧化物组成。传统上，该材料被认为是浪费，并存放在钢琴或坑坑附近的坑中。但是，在更严格的环境法规，资源需求和经济因素的驱动下，炉渣的回收已引起了人们的注意，并部分实践了。但是，该行业远非实现冶金渣的所有价值：矿物质超过6亿吨，每年的热能等于3400万吨煤炭。本研究旨在从基本角度理解和解决一些最关键的挑战，从而通过将其转换为适合高价值产品的材料来恢复炉渣的热和材料值。该研究计划在各种条件下冷却炉灶的结构变化，以使其转换为水泥原料和玻璃陶瓷等产品，同时将其热能转移到其他媒体上。此外，将研究通过特定冷却条件，其他材料的添加或氧化/还原的修饰，旨在从炉渣中恢复有价值的元素。冶金渣具有非常广泛的化学成分。因此，该研究计划的主要目标是了解炉渣的结晶行为，以及在非常基本层面上不同元素中不同元素的规范。预计这种投资将建立相关性，以预测重要参数，例如从初始组成和加工条件（例如冷却速率，气体大气等）来预测最终炉渣的结晶和矿物质一致性。结果对于建立科学知识基础，以及促进行业实现所有矿石的所有价值并朝着更可持续的实践迈进的能力而言，结果将非常重要。长期的好处是更清洁的金属提取和回收行业，减轻了地球资源的压力，并在材料加工，废物处理和材料表征方面具有专业知识的几名研究生和本科生培训。