| 摘要 |
<p>PURPOSE:To increase contact area between powdery and granular byproducts and reducing agent, to smoothly accelerate interface reaction and to remarkably improve reduction recovering ratio of valuable metal by mixing the powdery reducing agent and the powdery and granular byproducts in advance so as to charge the mixture into an electric furnace. CONSTITUTION:By recycling the powdery and granular byproducts of cutting scale, grinding powder, etc., produced in manufacturing process of stainless steel to the electric furnace, the valuable metal is recovered. At this time, by charging the above byproduct into the electric furnace after beforehand mixing the byproduct with the powdery reduction agent, the area of reaction interface between the powdery and granular by product and the powdery reducing agent is increased. As this powdery reducing agent and the powdery and granular byproducts are in the mixing condition at the time of charging these into the electric furnace, the byproduct comes into close contact with the reducing agent before the powdery and granular byproducts start to melt and flowing down after sending electric current the reducing reaction is accelerated from the starting time. In such way, as the reducing reaction is progressed over the whole time from starting conducting of the electric current to tapping the steel, the reduction recovering ratio to the valuable metal is extremely high in comparison with the conventional method.</p> |
