Smelting steel tailings micro-powder production method and apparatus thereof

Abstract

The present invention relates to the field of steel tailings micro-powder utilization, particularly to a smelting steel tailings micro-powder production method and an apparatus thereof. The method comprises steps such as material feeding and weighing, and is characterized in that weighed raw materials sequentially form process connections with a magnetic device, a static separator, a dynamic powder selection device, a high pressure roller press and a finished product warehouse, wherein a material outlet of the high pressure roller press is connected with a material feeding port of the magnetic device through a bucket elevator so as to achieve multiple material external circulations, multiple material magnetic separations, and efficient roller pressing crushing. Compared with the method and the apparatus in the prior art, the method and the apparatus of the present invention have the following beneficial effects that: 1) with the magnetic device, it can be effectively ensured that magnetic substances can be separated at the same quality; 2) with the static separator, half finished products are primarily separated, such that powder selection efficiency of the follow-up dynamic powder selection device is increased, and the condition that a specific surface area of the finished product is more than or equal to 450 m<2> / kg is met; 3) the high pressure roller press has characteristics of high operation rate and low power consumption so as to substantially improve steel tailings powdering efficiency; and 4) influence on the high pressure roller press service life by the magnetic substances is reduced.

Description

technical field [0001] The invention relates to the field of utilization of steel tailing slag powder, in particular to a production method and device for smelting steel tailing slag powder. Background technique [0002] At present, the processing technology of steel slag micro-powder usually uses magnetic separation to remove iron from the raw steel slag, and then enters the pre-grinder to grind it into a semi-finished steel slag powder, and then enters the desktop ball mill for final grinding after magnetic separation and iron removal. Made with a specific surface area greater than 400m 2 / kg of steel slag powder product. Generally, the magnetic field in the middle of the magnetic separation equipment is high, the magnetic field on both sides is low, and the change rate of the magnetic field intensity reaches 40%, which will lead to a low iron content in the slag steel selected by the middle magnetic field, and a low iron content in the slag steel selected by the two side...

AI Technical Summary

Problems solved by technology

However, due to the high content of metal impurities in steel slag raw materials, iron exists in steel slag raw materials in the form of metallic iron, iron oxide, ferrous oxide, etc., and steel slag also contains some non-ferromagnetic impurities, which are not easy to remove

The metal impurities in the steel slag raw material must be removed as much as possible during the feeding and grinding process, otherwise, the equipment will be severely worn, the normal operation will be affected or even production will not be possible, and the quality of the steel slag powder product will also be affected

In the vertical mill system, the material to be ground is repeatedly squeezed and ground on the grinding table for several times. After a period of operation, the iron-containing impurities in the material to be ground will be enriched on the grinding table, and the iron-containing impurities will be enriched on the grinding table. It will cause equipment wear and tear to accelerate sharply, power consumption will increase, and eventually need to be stopped for cleaning, resulting in low production efficiency and poor working environment

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