Method for comprehensively treating and utilizing dust sludge

Abstract

The invention provides a method for comprehensively treating and utilizing dust sludge. The method comprises the following steps of: (1) dispensing: carrying out dispensing calculation according to main ingredients of various iron-containing dust sludge to ensure that the excess coefficient of the content of free carbon reaches 1.0-1.8; (2) mixing: uniformly mixing materials by using mixing equipment; (3) molding: pressing the mixed material into a dust sludge block mass with a granularity of 5-15mm by using molding equipment; (4) drying: drying the molded dust sludge block mass at a temperature below 300 DEG C; (5) charging: after steel-making molten iron in a molten iron pot is blended into a rotating furnace, putting the dust sludge block mass into the hollow molten iron pot through charging equipment according to a weight determined by calculation, preheating and partially reducing the dust sludge block mass by utilizing the molten iron pot and the heat of residual molten iron in the molten iron pot, and sufficiently reducing by utilizing the heat of a large quantity of molten iron and a scouring and stirring effect after the molten iron pot loses iron; and (6) desulfurizing: moving the steel-making molten iron pot which finishes receiving the molten iron and is filled with the dust sludge block mass to a desulfurizing position to desulfurize, wherein after desulfurizing, the molten iron pot can be normally used for steel-making. The method can be used for treating any dust sludge materials without separating the iron dust sludge, ensures that all the iron dust sludge is utilized, simplifies the dust sludge treatment facility, reduces the enterprise cost and has obvious economic benefit and environmental protection benefit.

Description

technical field [0001] The invention relates to a treatment method for iron and steel dust in the metallurgical industry, in particular to a method for comprehensively treating and utilizing iron and steel dust to realize zero discharge. Background technique [0002] There is a large amount of dust and sludge produced in the process of ironmaking and steelmaking, especially blast furnace ash, gas ash, gas sludge and converter dust. caused environmental pollution. The main components of blast furnace ash, gas ash and gas sludge are 30% to 50% iron, 10% to 40% carbon and a small amount of calcium oxide, magnesium oxide, silicon oxide, etc. The main components of converter dust sludge are 60% to 70% iron and oxide Calcium, magnesium oxide, the iron, calcium, and magnesium contained in these dust and sludge are all beneficial components for iron and steel smelting, and have great development and utilization value. [0003] In the prior art, a method for controlling dust and mu...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a treatment method that fully utilizes iron and steel dust and sludge, which not only uses zinc-containing dust and sludge directly in the process of converter steelmaking, but also uses the gap between the molten iron tank and the desulfurization operation during iron mixing to complete the treatment of dust and sludge waste , and realize the recycling of iron resources, completely solve the problem of zinc enrichment in the blast furnace caused by the addition of zinc-containing dust sludge into the sintering process, and solve the problem of high energy consumption and power consumption in the existing dust sludge treatment technology, which requires special equipment, processing The process is long, the process is complicated, etc., and the economic and environmental benefits are obvious

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