Tar residue cold-bonded pellets, preparation method and use method thereof

Abstract

The invention provides tar residue cold-bonded pellets, a preparation method and a use method thereof, wherein the components comprise, by weight, 60-75% of tar residue and 25-40% of iron-containing waste. The preparation method comprises: adding tar residue and iron-containing waste to a stirring type intensive mixer according to a certain ratio through a screw conveyor, mixing, carrying out mixing grinding for 30-50 min in a mixing grinding machine, pressing with a cold pressing molding machine to prepare pellets, heating the wet pellets by using waste flue gas with a temperature of less than 350 DEG C, completely infiltrating and adsorbing the viscous body formed by the softening of the tar residue to the surface of the iron-containing waste, and naturally drying in the sun for 1-2 d toobtain cold-bonded pellets. The use method comprises: adding the cold-bonded pellets into a KR stirring desulfurization tank, and carrying out mechanical stirring to make the molten iron produce swirl so as to meet the kinetic and thermodynamic conditions of the reduction reaction, such that the iron in the iron-containing waste is reduced by using the carbon element in the tar residue. Accordingto the present invention, the iron resource recovery rate is over 98%, the reuse of tar residue and the joint utilization of various solid wastes can be achieved, the production cost can be effectively reduced, the resources can be saved, and the environment can be protected.

Description

technical field [0001] The invention belongs to the field of metallurgical waste treatment, and in particular relates to a cold solidified pellet prepared from tar residue and a preparation and use method thereof. Background technique [0002] A large amount of by-product coal tar is produced in the coke production process, and the pure tar extracted from coal tar can be used as blast furnace fuel, or other chemical raw materials such as gasoline are extracted from it, and the waste residue of extracting pure tar, namely tar residue, has not been very Good way to handle it. There are three main sources of tar residue in the coking plant: one is the mechanized tar ammonia water clarification tank. The tar ammonia water mixture is separated in the mechanized clarifier tank by different specific gravity. Slag is a semi-solid substance and is the main source of tar residue in coking plants. The second is that after the natural sedimentation of the tar, it also contains finer t...

AI Technical Summary

Problems solved by technology

[0004] So far, the application of tar residue is only limited to the field of coal blending and coking, and there are few other applications