JPH0159326B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a method for reducing iron ore with a mixture of heavy oil and coal to produce a mixture of metallic iron and excess carbon. Specifically, iron ore powder is mixed with heavy oil containing a large amount of fixed carbon and coal powder, and as it is heated,
Metallic iron is produced by reducing iron oxide in iron ore with most of the fixed carbon in heavy oil and a portion of the fixed carbon in coal, and most of the fixed carbon in coal is mixed with metallic iron. The present invention relates to a method for producing heavy oil into bulk oil and at the same time recovering volatile components in heavy oil. [Prior art and its problems] Conventional iron manufacturing methods are broadly classified into indirect reduction iron manufacturing methods using blast furnaces and other direct reduction iron manufacturing methods. Most direct reduction ironmaking methods involve reducing iron ore with reducing gases such as hydrogen and carbon monoxide, but iron ore is reduced while burning coal powder or heavy oil with air. Methods of producing reduced iron are also known. On the other hand, in the method of adding carbon to the reduced iron produced by direct reduction for the purpose of heat generation, hydrocarbons such as natural gas are supplied to the heated reduced iron, and free carbon is removed at the same time as thermal decomposition. How to add,
After the reduced iron is produced, it is made into a briquette.
In other words, a method is known in which carbon powder is added when making a lump. In addition, by mixing a large amount of heavy oil with iron ore powder,
Simultaneously with the production of reduced iron, a mixture of excess carbon and reduced iron can also be produced. Among the above methods, the method of thermally decomposing natural gas and carburizing it into reduced iron is difficult to control the reaction;
The method of adding carbon powder when making a mass of reduced iron also has the difficulty of adding and adhering carbon to the reduced iron uniformly and closely. In the method of mixing a large amount of heavy oil with iron ore powder to create a mixture of excess carbon and metallic iron while producing reduced iron, depending on the fixed carbon content of the heavy oil,
An excessive amount of heavy oil is required compared to iron ore powder, and uniform mixing may be difficult. [Disclosure of the Invention] The present invention is a direct reduction method of iron ore using fixed carbon of heavy oil, which improves the problems when mixing iron ore powder using heavy oil with a low fixed carbon content. In order to make it possible to use a wide range of heavy oils, heavy oil with a low fixed carbon content and coal powder with a high fixed carbon content are both mixed with iron ore powder and heated. At the same time, the volatile matter in the heavy oil generated is cooled and recovered, and iron ore is reduced to form a lump of reduced iron and fixed carbon, supplying the reaction heat that can melt the reduced iron during oxygen steelmaking in a converter. It can be melted in an electric furnace and used for cast iron, or used as a recarburizing material. The present invention involves uniformly mixing coal powder and heavy oil with iron ore powder, placing the mixture in a container, heating it in isolation from air, and cooling and collecting the volatile components of the heavy oil generated.
The mixture is heated at high temperature so that the fixed carbon in the heavy oil reacts with the iron oxide in the iron ore to generate metallic iron, carbon monoxide, and carbon dioxide, and the fixed carbon in the coal powder is converted to metallic iron. Ensure uniform mixing within the particles. Iron ore and coal particles are made to be less than 0.074mm,
After mixing with heavy oil, it is heated in a fixed bed or moving bed reactor at normal pressure. [Example] In the example, iron ore, heavy oil, and coal were mixed at a weight ratio of 160 g, 60 g, and 30 g, respectively, and the volatile matter was recovered while heating, and then the reaction conditions were heated at high temperature and reduction. The results are shown in the table below.

〔Effect of the invention〕

Therefore, compared to the blast furnace iron making process that uses sintered iron ore and coal for making coking coke, it is possible to increase the flexibility of reducing agents and fuels, produce a mixture of reduced iron and excess carbon, and transfer it. Burning and melting with oxygen in a furnace makes it suitable for the production of carbon monoxide at the same time as molten metal iron, or makes it suitable for producing cast iron in an electric furnace, such as heavy oil and coal, which are not easy to process. The efficiency of heavy hydrocarbon fuels and reducing agents can be increased.

Claims (1)

[Claims] 1. Coal powder and heavy oil are uniformly mixed with iron ore powder, heated in a fixed bed or moving bed, the volatile matter generated is cooled and collected, and the iron ore is directly reduced with fixed carbon to produce reduced iron and carbon. A method for direct reduction and carburization of iron ore with a mixture of heavy oil and coal, characterized by producing a mass of the mixture.