Compound sintering method for powdery iron-containing waste mini-pellets

Abstract

The invention discloses a compound sintering method for powdery iron-containing waste mini-pellets, which aims to reduce the environmental pollution of raising dust of powdery iron-containing waste materials and avoid the influence on the sintering quality. The method comprises the steps of: arranging two rows of atomizers in a drum mixer; mixing synthetical powder uniformly through the drum mixer, and performing intensified granulation on the synthetical powder to obtain pellets with the diameters of between 3 and 8mm under the action of a rotary force of the drum mixer; mixing the synthetical powder pellets and coke powder in percentage by weight: 96.5 percent of the synthetical powder pellets and 3.5 percent of the coke powder; distributing the mixture on a belt-type sintering machine after the mixing, adopting a double-sloping girdle ignition furnace, using coke oven gas for ignition at the temperature of 1,050 DEG C, using an exhaust fan at a rate of 4,500m3 / min for air draft, and consolidating to form mini-pellet ore with the diameter of between 3 and 8mm under the condition of the suction negative pressure of 8,500Pa and the sintering temperature of 1,200 DEG C; and adding the mini-pellet ore taken as an iron material into a sintering mixture for secondary sintering consolidation to obtain compound sintered ore.

Description

technical field [0001] The invention relates to a composite sintering method of powdery iron-containing waste small pellets. Background technique [0002] In order to effectively utilize waste resources, iron and steel enterprises use various recycled materials such as steel-making dust, iron-making dust, steel slag, iron oxide scale, etc., through neutralization and mixing in a certain proportion to form comprehensive powder, and then the comprehensive powder is added to sintering. The raw materials are recycled, because more than 70% of the materials constituting the comprehensive powder are fine powder dust removal ash, which causes the dust flying during the comprehensive powder batching process to seriously pollute the environment, and the dust removal ash has poor water absorption and is not easy to be dispersed, so that the finished sinter often occurs. Comprehensive powder concentration block, affecting the quality of sinter. SUMMARY OF THE INVENTION [0003] The ...

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Problems solved by technology

[0002] In order to make effective use of waste resources, iron and steel enterprises neutralize and mix various circulating materials such as steelmaking dust, ironmaking dust, steel slag, and iron oxide scale according to a certain proportion to form comprehensive powder, and then add the comprehensive powder to the sintering process. The raw materials are recycled, because more than 70% of the materials that make up the composite powder are fine powder dust, which causes dust to fly during the batching process of the composite powder and seriously pollutes the environment, and the dust has poor water absorption and is not easy to disperse, so that the composite powder concentration often occurs in the finished sinter blocks, affecting the quality of sinter