Method for mfg. composite carbon containing pellets and device thereof

Abstract

A process for preparing the C-contained composite balls suitable for smelting steel in electric furnace or used as the carburant includes such steps as proportionally mixing raw materials, die pressing to form balls, coating film on the surface of ball, and cooling. Its apparatus is composed of material cabin, proportioning unit, three-roller planetary mixer, die press, coating unit, cooler and metering packer.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and mainly relates to a method for manufacturing carbon-containing pellets for iron and steel smelting and a device thereof. Background technique [0002] There are many kinds of raw materials in the iron and steel metallurgical industry, among which the main raw materials are ore, coke, iron ore powder pellets, scrap steel, etc., and the auxiliary raw materials include refractory materials, lime, various fluxes and mold slag, among which iron ore powder pellets are also commonly used A raw material, such as sintered pellets for blast furnaces, synthetic pellets for out-of-furnace refining, carbon-containing pellets for electric furnaces, etc. These pellets use two or more kinds of powdery or granular metallurgical raw materials, directly or add binders, and artificially synthesize through different mechanical devices. These pellets are required to have a certain shape and size, and have...

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Problems solved by technology

At present, there are two main methods of manufacturing such pellets: the first is disc (inclined) rotary pelletizing or granulation. This kind of mechanical pelletizing usually uses water or other aqueous liquids as binders for powdery materials. Such as pellets for blast furnace ironmaking, gypsum for cement additives, etc. After the pellets are formed, they must be dried and then used. The main disadvantage of this manufacturing method and its device is that the pellets have low compressive strength, which is not conducive to preservation. , transportation and loading and unloading; the second is to use steel molds, models for stamping or extrusion or rotating roller extrusion pelletization or granulation, discontinuous single stamping or extrusion is suitable for larger size refractory materials Bricks or agglomerates have the disadvantages of low productivity and high production costs, while rotary roller extrusion can be produced continuously and are suitable for various special pellets. The disadvantages are that the pellets produced have strong water absorption and are not dense , low compressive strength, the above manufacturing method has a variety of manufacturing devices, such as continuous extrusion equipment for monomers, and some are production lines composed of different systems, such as including feeding system, mixing system, roller pressing and Weighing, packaging, etc.

In summary, the common disadvantages of the above pellet manufacturing methods and their devices are that the surface of the pellets is untreated, has strong water absorption, is easy to deliquesce, and is not compact, so the compressive strength is low, and it is especially not suitable for manufacturing steelmaking pellets. carbon pellets

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