Ferrous and carbonaceous dust cyclic reutilization process and equipment

Abstract

The invention discloses a ferrous and carbonaceous dust cyclic reutilization process and equipment. The process has the process route of a dust collecting tank, a suction discharge vehicle, a filter, a dust storage tank, a star-shaped discharger, a double-wheel stirring humidifier, a feeding belt, a blast furnace powder manufacture system, a blowing system and a blast furnace. The suction discharge vehicle conveys ferrous dust into the ferrous and carbonaceous dust storage tank through a pipeline arranged at the lower part of the dust collecting tank of a dust removal station, the dust is downwards discharged into a dust humidity regulator, the controllable humidity regulation is carried out on the dust, and then, the dust is piled or is conveyed to a raw coal cabin through the raw coal feeding belt to enter the coal grinding dust manufacture system and to enter the original blowing system. The process and the equipment have the advantages that the sealing performance is good, the safety is high, the unforeseen event adaptation capability of the systems is high, the dust humidity is controllable, the occurrence of the phenomenon that the ferrous dust adsorbed by an iron detector is avoided, in addition, the blast furnace can not generate operation fluctuation because of the blowing of the ferrous dust, and the process and the equipment have the advantages that the yield is improved, the coke is saved, the smooth operation and the reinforcement of the blast furnace are promoted, cleanness and environment protection are realized, and the like.

Description

technical field [0001] The invention belongs to the technical field of ironmaking, and in particular relates to a process for recycling metallurgical dust containing iron and carbon in ironmaking production. Background technique [0002] The iron-containing dust produced in the process of iron and steel production generally contains 20% to 60% iron and contains a certain amount of carbon. Therefore, it is generally recycled. The existing main utilization method is to return to the sintering workshop and re-add the agglomerate ingredients, or mix it with coal powder and spray it directly into the blast furnace. [0003] The defect of "re-adding agglomeration ingredients" is obvious: re-agglomeration itself is a waste of energy, and will lead to varying degrees of deterioration in indicators such as the strength of sinter; [0004] The method of "mixing pulverized coal and directly injecting into the blast furnace" cannot achieve uniform injection of pulverized coal and iron...

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Problems solved by technology

[0008] Since this method increases the operation of transporting the iron-containing dust to the raw coal yard by car and mixing it with the raw coal in the raw coal yard through "flat laying and direct extraction", due to the small particle size and low moisture content of the iron-containing dust, the process of Moreover, because the wettability of dust and water is very poor, adding water to moisten the dust not only can not reduce the dust, but also makes the dust more aggravated.

[0009] 2) It is easily absorbed by the iron remover, causing the coal loading operation to be interrupted

According to this method, if the mixture of iron-containing dust and raw coal that cannot be mixed evenly is transported to the belt, the problem of iron-containing dust being absorbed by the iron detector will inevitably occur, resulting in the interruption of coal loading operation

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