Device for manufacturing slag pellets through sulfuric-acid residue and manufacturing method thereof

Abstract

The invention discloses a device for manufacturing slag pellets through sulfuric-acid residue and a manufacturing method thereof and relates to the technical field of metallurgy. The technical problem that the yield, production efficiency and the finished product quality cannot be improved is solved. The device comprises an exhaust fan, and a combustion furnace provided with multiple independent furnace chambers, wherein the upper end of each furnace chamber is provided with a feeding hole and an exhaust port, and the lower end of each furnace chamber is provided with a discharge opening; each furnace chamber is a breathable discharging bin door; the exhaust port of each furnace chamber is connected to the exhaust fan; when the pellets are manufactured, the dross coal mixed paste formed by mixing high-grade sulfuric-acid residue powder, pulverized coal and water is manufactured into secondary finished ore slag pellets, the limestone powder is sprayed after polished finish, the secondary finished ore slag pellets are thrown into each furnace chamber for combustion, the air is exhausted by utilizing the exhaust fan, the completely sintered finished ore slag pellets are timely taken from the bottom of the furnace chambers without closing the exhaust fan, and the secondary finished ore slag pellets are supplemented from the top of the furnace chambers. According to the device and the method, the sulfuric-acid residue can be used for manufacturing high-quality ore slag pellets for iron-making.

Description

technical field [0001] The invention relates to metallurgical technology, in particular to a device for manufacturing slag pellets from sulfuric acid slag and a technology for manufacturing the same. Background technique [0002] Sulfuric acid slag is the tailings of sulfuric acid production enterprises after refining sulfuric acid. It mainly contains iron and can be used to produce sulfuric acid slag pellets for ironmaking. [0003] At present, conventional shaft furnaces and rotary kilns are used to make slag pellets from sulfuric acid slag. Both conventional shaft furnaces and rotary kilns use blowing combustion. If it is airtight, the blower needs to be turned off when the finished pellets come out of the furnace, otherwise the wind will blow out from the discharge port, and the furnace ash in the furnace cavity will also be blown out, polluting the external working environment, and the sub-product pellets on the top of the furnace cavity are not easy to completely Comb...

AI Technical Summary

Problems solved by technology

[0003] At present, conventional shaft furnaces and rotary kilns are used to make slag pellets from sulfuric acid slag. Both conventional shaft furnaces and rotary kilns use blowing combustion. If it is airtight, the blower needs to be turned off when the finished pellets come out of the furnace, otherwise the wind will blow out from the discharge port, and the furnace ash in the furnace cavity will also be blown out, polluting the external working environment, and the sub-product pellets on the top of the furnace cavity are not easy to completely Combustion, and the furnace body is tall and large. The height of the furnace body (that is, the height difference between the top surface and the bottom surface of the furnace cavity) is usually at least 10 meters, and the inner diameter is at least 2.5 meters. Due to the low density of sulfuric acid slag, it is full of sponge holes , the pellets are also easy to break and crush, and the water content of the sintered pellets is usually as high as about 20%, which is not conducive to ironmaking

In addition, when conventional shaft furnaces and rotary kilns are used to manufacture sulfuric acid slag pellets, the secondary product pellets are directly ignited without preheating, so the secondary product pellets are also easy to burst

[0004] It can be seen that due to the above-mentioned many defects, the final yield of sulfuric acid slag pellets produced by conventional shaft furnaces and rotary kilns is not high, and the mode of intermittent production (the fan needs to be turned off when the furnace is discharged) makes the production efficiency low. Therefore, when using sulfuric acid slag to make slag pellets, it is necessary to add a large amount of iron concentrate powder (iron ore) to the sulfuric acid slag to produce qualified sulfuric acid slag pellets.

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