The present invention discloses to a Hot-work die steel electroslag remelted ingot and a manufacture method thereof. The electroslag remelted ingot comprises the following chemical components, C: 0.36-0.41%, Si: 0.80-1.10%, Mn: 1.00-3.00%, Cr: 4.90-5.40%, Mo: 1.35-1.55%, V: 0.4-0.7%, Ni≤0.04%, Cu≤0.04%%, S≤0.003%, P≤0.012%, O≤0.0015%, H≤0.0002%, N≤0.006%, 0.05%≤RE≤0.20%, the balance being Fe. The above percentage is percentage by mass. According to the present invention, the features of electroslag remelting under inert gas protection are fully combined and a rare earth alloy is precisely fed during the electroslag remelting, thus exerting the excellent effects of RE inclusion modification and micro-alloying under high purity and high uniformity conditions and realizing high-quality and high-performance Hot-work die steel.

Disclosed is a single-chamber furnace for fuming an evaporable metal or metal compound from a metallurgical charge including a bath furnace for containing a molten charge up to a determined level, the furnace being equipped with a non-transferred plasma torch for the generation of plasma and a first submerged injector for injecting the plasma below the determined level, the furnace further including an afterburning zone to form an oxidized form of the at least one evaporable metal or metal compound, and a recovery zone for recovering the oxidized form from the gas formed in the afterburning zone, whereby the furnace is further equipped with a second submerged injector for injecting extra gas into the furnace below the determined level. Further disclosed is the use of the furnace and a process for fuming an evaporable metal or metal compound from a metallurgical charge.

Disclosed is a single-chamber furnace for fuming an evaporable metal or metal compound from a metallurgical charge including a bath furnace for containing a molten charge up to a determined level, the furnace being equipped with a non-transferred plasma torch for the generation of plasma and a first submerged injector for injecting the plasma below the determined level, the furnace further including an afterburning zone to form an oxidized form of the at least one evaporable metal or metal compound, and a recovery zone for recovering the oxidized form from the gas formed in the afterburning zone, whereby the furnace is further equipped with a second submerged injector for injecting extra gas into the furnace below the determined level. Further disclosed is the use of the furnace and a process for fuming an evaporable metal or metal compound from a metallurgical charge.

A roller treatment process and a treatment device suitable for a total-amount steel slag treatment. The treatment process is: firstly, a slag tank (2) with the molten slag is tightly held by a slag tank tilting mechanism and moved to a slag inlet position, the slag tank (2) is tilted to pour the molten slag with good fluidity into a rotary roller device (5) through a feeding chute (51), so that a roller treatment is achieved; secondly, when the steel slag (3) without fluidity in the slag tank (2) cannot flow out, a slag removal machine (4) is used for pushing the high-viscosity slag or the solid slag into the roller device (5); and thirdly, the slag tank (2) is reversed by a large angle tilting to make the slag at the bottom of the tank drop into the roller device (5), so that the total-amount steel slag treatment of the same roller device (5) is achieved. The treatment device comprises a feeding system, the roller device (5), a particle slag conveying and storage system (7), a tail gas emission and purification system (6), a cooling water circulation system (8), a cold steel cleaning mechanism (10) and an electric control system (9); and the feeding system comprises the slag tank tilting mechanism (1), the slag tank (2), the molten slag (3) and the slag removal machine (4).

A roller treatment process and a treatment device suitable for a total-amount steel slag treatment. The treatment process is: firstly, a slag tank (2) with the molten slag is tightly held by a slag tank tilting mechanism and moved to a slag inlet position, the slag tank (2) is tilted to pour the molten slag with good fluidity into a rotary roller device (5) through a feeding chute (51), so that a roller treatment is achieved; secondly, when the steel slag (3) without fluidity in the slag tank (2) cannot flow out, a slag removal machine (4) is used for pushing the high-viscosity slag or the solid slag into the roller device (5); and thirdly, the slag tank (2) is reversed by a large angle tilting to make the slag at the bottom of the tank drop into the roller device (5), so that the total-amount steel slag treatment of the same roller device (5) is achieved. The treatment device comprises a feeding system, the roller device (5), a particle slag conveying and storage system (7), a tail gas emission and purification system (6), a cooling water circulation system (8), a cold steel cleaning mechanism (10) and an electric control system (9); and the feeding system comprises the slag tank tilting mechanism (1), the slag tank (2), the molten slag (3) and the slag removal machine (4).

Disclosed are an apparatus and a method for granulation of a blast furnace slag and recycling of waste heat. The apparatus comprises an aerosol granulation nozzle module, a flow guide, a cyclone separator and a waste heat recovery device; wherein the aerosol granulation nozzle module comprises a slag flow controller, a compressed air flow control valve, a water volume control valve and an aerosol spray gun; the flow guide is configured to fully mix the medium temperature gas and the high-temperature granular slag having a primarily solidified surface in the flow guide; and the cyclone separator is configured to separate the high-temperature granular slag and the medium-to-high-temperature gas. The present invention completes the granulation of blast furnace slag, and organically couples slag sensible heat recovery with sludge drying, thereby recovering the waste heat in the process of slag granulation and improving the efficiency of waste heat recovery and utilization.

Proposed is a method for removing phosphorus from a phosphorus-containing substance which is applicable in an industrial scale so as to effectively reduce phosphorus contained in the phosphorus-containing substance. In this method, the phosphorus-containing substance used as a raw material for metal smelting or metal refining is reacted with a nitrogen-containing gas at a treatment temperature T (° C.) which is lower than a melting temperature (T.sub.m) of the substance, so that phosphorus is removed preferably in the form of phosphorus nitride (PN). In this regard, a nitrogen partial pressure and an oxygen partial pressure in the nitrogen-containing gas are preferably controlled, thereby reducing a load of dephosphorization process, for example.

The invention relates to a method for producing rock wool and cast iron by melting a mixture of materials such as basalt, blast-furnace slag, coke and components necessary for melting, with an admixture containing alumina, said admixture making it possible to adjust the alumina content in order to obtain a rock wool having the following composition (as wt %): Al2O3: 18-22; SiO2: 40-50; CaO: 10-15; MgO: <10; FeO: <2; Na2O: <4; K2O: <2. The method includes the following operations: producing by melting a slag and a cast iron, separating the slag and the cast iron, and performing a fibring operation on the slag followed by a bonding operation in order to obtain the rock wool. According to the invention, at least one spent adsorbent and/or catalyst is used as an admixture, said catalyst containing alumina in Al2O3 form. Said adsorbent and/or catalyst preferably contains at least one metal, and said metal is retrieved in the cast iron.

The invention relates to a method for producing rock wool and cast iron by melting a mixture of materials such as basalt, blast-furnace slag, coke and components necessary for melting, with an admixture containing alumina, said admixture making it possible to adjust the alumina content in order to obtain a rock wool having the following composition (as wt %): Al2O3: 18-22; SiO2: 40-50; CaO: 10-15; MgO: <10; FeO: <2; Na2O: <4; K2O: <2. The method includes the following operations: producing by melting a slag and a cast iron, separating the slag and the cast iron, and performing a fibring operation on the slag followed by a bonding operation in order to obtain the rock wool. According to the invention, at least one spent adsorbent and/or catalyst is used as an admixture, said catalyst containing alumina in Al2O3 form. Said adsorbent and/or catalyst preferably contains at least one metal, and said metal is retrieved in the cast iron.

On molten iron having a P concentration of 2 to 4 mass % and having a Cr concentration of 0.3 to 1.2 mass %, a dechromization treatment is performed by adjusting a basicity (CaO mass %)/(SiO.sub.2 mass %) of slag to greater than 0.1 and 1 or less and supplying an oxygen source with a molten iron temperature falling within a range of 1250 to 1500° C. to manufacture molten iron having a P concentration of 1.9 to 3.8 mass % and having a Cr concentration of less than 0.2 mass %.