Steel slag superfine powder production process

Abstract

The invention discloses a steel slag superfine powder production process and belongs to the technical field of resource comprehensive utilization and environment protection. The steel slag superfine powder production process comprises the steps that a coarse grinding device is used for conducting coarse crushing on steel slag tailings; the steel slag tailings subjected to coarse crushing are sorted by a screening magnetic separation device and then are divided into tailing fine powder and magnetic iron; the tailing fine powder enters a steam crushing device and is impacted and crushed by overheated high energy steam; the mixture of the steel slag superfine powder formed after impacting and crushing by the high energy steam and the overheated steam enters a superfine powder sorting device; the steel slag superfine powder is discharged out of the superfine powder sorting device and enters a steel slag superfine powder bin; and the overheated steam is discharged out of the top of the superfine powder sorting device and collected by a steam collection device. The steel slag superfine powder production process has the advantages that ferric oxide in the tailings is extracted to the greatest extent, the produced steel slag superfine powder not only can be used as concrete additives, but also can be used as rubber and plastic filling and coating filling, and the price of the powder is up to more than one thousand yuan per ton.

Description

technical field [0001] The invention belongs to the technical field of resource comprehensive utilization and environmental protection, and in particular provides a production process of steel slag superfine powder. Background technique [0002] As steelmaking solid waste, steel slag tailings are mainly discarded at present due to its difficult treatment. A small number of steel mills will recover a small amount of iron oxide after fine grinding, and use the finely ground powder as a concrete admixture. The finely ground powder treated in this way as a concrete admixture not only has a large particle size and a small specific surface area, but also The degree of separation and extraction of iron oxide is low, and iron oxide is mixed with silicon, calcium, aluminum, and magnesium oxides, which have cement gelling activity in the tailings, which will seriously affect the gelling activity of the finely ground powder. The use of grinding powder as a cement admixture will also l...

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Problems solved by technology

A small number of steel mills will recover a small amount of iron oxide after fine grinding, and use the finely ground powder as a concrete admixture. The finely ground powder treated in this way as a concrete admixture not only has a large particle size and a small specific surface area, but also The degree of separation and extraction of iron oxide is low, and iron oxide is mixed with silicon, calcium, aluminum, and magnesium oxides, which have cement gelling activity in the tailings, which will seriously affect the gelling activity of the finely ground powder. The use of grinding powder as cement admixture will also lead to adverse consequences such as volume expansion of cement in the later stage (volume expansion caused by free calcium oxide), and poor filling effect (uneven particle size)

In order to further improve the utilization effect of finely ground powder, it is often necessary to grind and screen multiple times, which greatly increases the production cost

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