Carbon-containing pellet for blast furnace

Abstract

The invention discloses a carbon-containing pellet for a blast furnace, which belongs to the technical field of carbon-containing pellets. The carbon-containing pellet provided by the invention comprises, by mass, 11 to 13 parts of ash collected from the head of a sintering machine through electric precipitation, 38 to 42 parts of blast furnace sludge, 20 to 22 parts of fly ash collected from an ore groove at the front of a furnace, 17 to 19 parts of calcium-free chromium slag, 10 to 12 parts of vanadic titanomagnetite, 3 to 5 parts of zirconia, 1 to 2 parts of bentonite and 1 part of calcium hydroxide. According to the invention, the ash collected from the head of the sintering machine through electric precipitation, the blast furnace sludge, the fly ash collected from the ore groove at the front of the furnace and the calcium-free chromium slag are used as components of the pellet, so resource recycling of the above-mentioned wastes is realized, and production cost for the carbon-containing pellet is reduced; a prepared wet pellet has falling strength of more than 9.5 times / 0.5 m and compressive strength of more than 33.65 N / pellet, a prepared dry pellet has falling strength of more than 4.2 times / 0.5 m and compressive strength of more than 96.82 N / pellet, and the pellet has good mechanical properties.

Description

Technical field [0001] The present invention involves the technology field of carbon -containing groups, and more specifically, it involves a carbon -containing group for blast furnaces. Background technique [0002] The increasing shortage of coking coal resources is a bottleneck for the sustainable development of traditional blast furnaces that excessively rely on high -quality coking coal.The pre -redeemed metal furnace material produced by the coal -based direct reduction method is an effective measure to reduce this dependence.More than 80 ~ 90%of the metalization rate is called metal -based piercing.The metalization rate reaches 30 ~ 80%of the semi -metallic chemical ball mines. [0003] According to the practice of the United States and Japan's blast furnaces, such as metal -based groups, the metalization rate of the group ore can be reduced by 4-6%for every 10%increase in the metal ore ore, and the output increases by 5-7%.Use the 100%metallicization rate of 65%of the met...

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Problems solved by technology

[0007] The object of the present invention is to overcome the shortcomings of the prior art that carbon-containing pellets have a low degree of resource utilization of dust waste in iron and steel plants and high production costs, and provide a carbon-containing pellet for blast furnaces. Carbon-containing pellets can recycle sintering head electric dust, blast furnace gas mud, furnace front mine tank dust and calcium-free chromium slag