Self-reduction utilization process for steel rolling oily sludge and blast furnace gas dust

Abstract

The invention discloses a self-reduction utilization process for steel rolling oily sludge and blast furnace gas dust. Limestone powder with the grain size smaller than 2mm is purchased and conveyed to a pelletizing production line for use, and an opposite-roll cold pressing pelletizing machine production line is adopted by the pelletizing production line; meanwhile, the steel rolling oily sludge and blast furnace gas dust are conveyed to the pelletizing production line for use; the limestone powder, the blast furnace gas dust and the steel rolling oily sludge are added into an ordinary vertical mixer to be stirred and mixed uniformly according to mass percentages of 10:75:15; after a mixture obtained in the previous step is mixed uniformly, the mixture is compacted into pellets with the diameters of 30-50 mm on an opposite-roll cold pressing pelletizing machine, and then the pellets are conveyed to a converter production line for use; during a converter deslagging process, the pellets are added into a slag tank along with steel slags, or the pellets are added into the slag tank containing molten steel slags from the top, and the mass ratio of the added pellets to the steel slags is 1:10; and after the pellets are added, the slag tank stands for 60+ / -20 min, and then the steel slags can be processed according to a normal slag hot disintegration process.

Description

technical field [0001] The invention relates to a self-reducing utilization process of steel rolling oily sludge and blast furnace gas ash, which uses steel rolling oily sludge and blast furnace gas ash to produce synthetic self-reducing pellets, which are added to a slag tank containing converter liquid steel slag, and utilizes the steel slag Waste heat is used for upgrading. Background technique [0002] Oily sludge is an inevitable product of steel rolling oily wastewater treatment process, its volume accounts for about 0.3% to 1% of the treated sewage volume, and the sludge treatment cost accounts for about 8% to 25% of the entire water treatment cost. With the improvement of production capacity of enterprises and the increase of water consumption, sludge discharge also increases accordingly. The characteristics of oily sludge are high water content, large volume, easy to produce stench, large proportion due to iron oxide powder, and granular, high hardness, large wear,...

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Problems solved by technology

(4) Xu Haichuan, Zhou Hemin and others published in the third issue of "Steel" magazine in 2012 entitled "Engineering and Production Practice of Rotary Hearth Furnace Treatment of Solid Waste in Steel Plants" with "Steel Plants Zinc-containing dust cannot be effectively recovered in the blast furnace ironmaking process, resulting in a huge waste of resources and environmental pollution

But there is no way to express the subsequent use of sludge

(2) At present, the most effective process for blast furnace gas ash is to use the rotary hearth furnace process, but the investment in the process equipment of the rotary hearth furnace is relatively high, and the cost of processing zinc-containing dust such as blast furnace gas ash is relatively high

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