摘要:
Metallurgical slag is expanded to produce a lightweight solid by forming a stream of molten liquid slag of controlled rate of flow and mixing the stream of slag with a controlled quantity of water and flowing the interacting mixture of slag and water into a receptacle. The interaction between slag and water is allowed to proceed for a predetermined period of time to form an expanded solid without the addition of any additional cooling water which would otherwise quench the material and vitrify it. In the receptacle, a vaned rotor operates to segment the interacting mixture of slag and water and project the segmented mixture through the air for collection into a heap.
摘要:
A process and apparatus for granulating slag in which molten slag is charged into a drum and is solidified and granulated therein on cooled surfaces. To ensure a rapid cooling at a high thruput rate, the molten slag is applied to the inside surface of a drum, which rotates on a horizontal axis and has a cooled shell, and the solidified film of slag is mechanically detached from the inside surface after about three-quarters of a revolution of the drum and is discharged.
摘要:
Molten blast furnace slag is quenched by a volume of water divided into two streams. The first stream is directed downwardly against the slag while the second stream is directed horizontally against the slag. The molten slag is broken down into relatively fine sand-like granules which are kept submerged in the water. The vapors formed during granulation are substantially free of detectable SO.sub.2 and the H.sub.2 S formed and vented to the atmosphere is insufficient to be a detriment to the surrounding environment.
摘要:
Method and apparatus for dewatering granulated material, particularly blast furnace slag that has been granulated by quenching hot slag. The quenched material is dewatered in a bucket wheel whose scoops have perforated bottoms. The solids from the wheel are discharged onto a continuous conveyor; while the liquid is passed along an inclined filter and then clarified and reused. Various filter and clarifier constructions are disclosed.
摘要:
Disclosed herein is a method for stabilizing slag, which is an oxide byproduct generated after completion of refining in a converter process for converting molten iron into molten steel via de-carbonization or in an electric arc furnace process for producing molten steel via melting of scrap iron, during iron/steel making processes, and a novel material produced thereby. More particularly, disclosed is a method for stabilizing and recycling slag, wherein converter slag or electric arc furnace slag, which is difficult to recycle because of free lime (i.e. free calcium oxide (CaO) referring to single-phase CaO) remaining therein after cooling, is subjected to appropriate treatments after completion of converter blowing, thereby restricting generation of free lime, and consequently, minimizing differentiation/expansion, environmental pollution and instability of slag. The method for stabilizing slag includes allowing molten slag to fall, injecting high-pressure gas to falling molten slag to separate the molten slag into fine droplets, and quenching the fine droplets with the injected gas and surrounding atmosphere.
摘要:
A method is disclosed for water-granulating calcium ferrite slag which is produced in copper converting processing and contains 10 to 30 weight % of CaO. In the method, water is caused to flow at a flow velocity of 7 to 25 m/sec, and the calcium ferrite slag is introduced into the water flow such that weight ratio of water to slag amounts to no less than 100. With this method, the occurrence of phreatic explosions can be effectively avoided.
摘要:
An apparatus for manufacturing a rapidly cooled solidified slag, which comprises: a pair of cooling drums, the peripheral surfaces of said pair of cooling drums being in contact with each other and rotating in directions opposite to each other at the same peripheral speed; a pair of weirs provided at the both ends of said pair of cooling drums so as to be in contact with the both ends of said pair of cooling drums, said pair of weirs forming a slag sump in cooperation with the upper half of the peripheral surface of each of said pair of cooling drums, and a molten slag being poured into said slag sump; a pair of gas nozzles provided adjacent the peripheral surface of each of said pair of cooling drums, said pair of gas nozzles uniformly ejecting a gas onto the molten slag, which has been deposited on the surface of said pair of cooling drums in said slag sump, to blow part of said molten slag back into said slag sump, thereby uniformly reducing the thickness of said molten slag deposited on the peripheral surface of said pair of cooling drums; a cooling medium for cooling said pair of cooling drums, said cooling medium being supplied to each of said pair of cooling drums, and exchanging heat with said molten slag deposited on the peripheral surfaces of said pair of cooling drums, whereby said molten slag becomes a rapidly cooled solidified slag through heat exchange with said cooling medium, and is peeled off from the peripheral surfaces of said pair of cooling drums by means of a scraper.
摘要:
A process is disclosed for producing spherical particles or fibers with a specially fixed size from a melt of metal, slag, or flux, by introducing the melt onto the center of a rotating disk through a conduit so as to form a thin film stream of boundary layer on the disk; projecting the thin film stream at a high speed from the disk periphery into surrounding space to split up the film stream into linear streams; and cooling the linear streams for producing fibers or cooling droplets after further splitting of the each linear stream into droplets for producing spherical particles, with or without parallel or countercurrent gas flow to the linear streams.
摘要:
A process for granulating slag melts, glass melts, ceramic melts, metal melts and melts of metal alloys, particularly blast furnace slag melts, the melt being shaped into at least one thin, liquid melt stream moving freely in a predetermined direction and which, by meeting at a predetermined incidence angle with a stream of fine-grained, solid particles and/or gas, particularly inert gas, flowing substantially freely in a substantially uniform direction at a high rate of flow in relation to the melt stream or melt streams, being converted at least partly into a substantially fine-grained granulate having a fan-shaped distribution over at least part of the opposite angle to the incidence angle.
摘要:
An apparatus is disclosed for producing spherical particles or fibers with a specially fixed size from a melt of metal, slag, or flux, by introducing the melt onto the center of a rotating disk through a conduit so as to form a thin film stream of boundary layer on the disk; projecting the thin film stream at a high speed from the disk periphery into surrounding space to split up the film stream into linear streams; and cooling the linear streams for producing fibers or cooling droplets after further splitting of the each linear stream into droplets for producing spherical particles, with or without parallel or countercurrent gas flow to the linear streams.