CN104399584A - Dry magnetic separation technology for waste steel slags - Google Patents

Abstract

The invention relates to a magnetic separation technology for steel slags, in particular to a dry magnetic separation technology for waste steel slags. The technology comprises the following steps: the waste steel slags of which the iron content is more than 30% are put in a powerful magnetic separator, and iron-containing steel slags of which the iron content is more than 45% and waste are separated out through a powerful magnetic field under the action of centrifugal force; the iron-containing steel slags of which the iron content is more than 45% are put in a baking machine to be baked, dehydrated and processed, and the water content of the iron-containing steel slags is 3% after the iron-containing steel slags are baked and dehydrated,; the baked and dehydrated iron-containing steel slags are put in a crusher to be crushed and ground to enable the crushing granularity to be less than 1 mm; the iron-containing steel slags which are crushed, ground, and separated are put in an efficient dry powder magnetic separator for screening to obtain the steel slags of which the iron content is more than 60%, wherein the steel slags can be directly used for steel-smelting production. The whole technology process does not waste water resources, so that not only are the water resources saved but also environment can be protected, and the technology is a new way for replacing a water-addition wet method for producing the steel slags at present.

Description

Steel slag dry magnetic separation technique

technical field

The present invention relates to steel scoria magnetic separation technique, specifically a kind of steel slag dry magnetic separation technique.

Background technology

Slag is that the waste residue that steel-making produces is referred to as.Slag, through dry magnetic separation, can select the slag of iron compound more than 60 percent, and such slag can enter converter and continue steel-making, improves resource utilization.And slag after dry magnetic separation due to iron-holder very low, even if dry magnetic separation further, also can only isolate inner iron content about 30 percent slag.At present, in order to efficiency utilization steel-making waste residue, usually by very low for iron-holder steel slag, adopt water mill magnetic separation mode to obtain the slag of iron compound more than 60 percent.This wet production slag that adds water can produce a lot of waste residue and be excreted to underground with mud, and steel slag, containing a lot of harmful substance, penetrate into underground pollution underground water, and mud can solidify through precipitation, destroy environment, affect twice laid again.Therefore, governments at all levels are banning slag wet production always.

Summary of the invention

The present invention is intended to solve the problem of environmental pollution that current wet method scrap processing slag exists, and provides one can protection of the environment, reduces the steel slag dry magnetic separation technique of water resource waste.

The present invention solves described problem, and the technical scheme of employing is:

A kind of steel slag dry magnetic separation technique, carry out in the steps below:

(1) steel slag of iron-holder more than 30 percent is entered powerful magnetic separator, by powerful magnetic field, under centrifugal action, isolate the iron content slag of iron-holder more than 45 percent and discarded object;

(2) the iron content slag of iron content more than 45 percent is entered dryer and carry out drying and dewatering process, after drying and dewatering, iron content slag water content is 3%;

(3) the iron content slag after drying and dewatering is entered disintegrating machine and carry out pulverizing milled processed, particle size after cracking 1 below ㎜;

(4) the iron content slag pulverizing milled processed separation is entered high-efficiency dry powder magnetic separator to screen, obtain the slag of iron-holder more than 60 percent, be directly used in STEELMAKING PRODUCTION.

Adopt the present invention of technique scheme, compared with prior art, its outstanding effect is:

Whole technical process is without water resource waste; both saving water resource; again can protection of the environment; obtain the iron compound of iron-holder more than 60 percent and be directly used in STEELMAKING PRODUCTION; and discarded slag is also high-quality building materials raw materials, cement can be produced, make non-burning brick, repair the roads, turn waste into wealth; taking full advantage of industrial waste, is the new way substituting the wet production slag that adds water at present.

Accompanying drawing explanation

Fig. 1 is present invention process flow chart.

Detailed description of the invention

Below in conjunction with drawings and Examples, the present invention is further elaborated, but the present embodiment does not form any restriction to the present invention.

See Fig. 1, the present embodiment gives up the steel slag dry method magnetic separation process provided, and carries out in the steps below:

(1) by iron-holder about 35 percent steel slag enter powerful magnetic separator, by powerful magnetic field, under centrifugal action, isolate the iron content slag of iron-holder more than 45 percent and discarded object; Powerful magnetic separator is dry powder magnetic separator.

(2) the iron content slag of iron content more than 45 percent is entered dryer and carry out drying and dewatering process, after drying and dewatering, iron content slag water content is 3%; Drying and dewatering object is for the ease of entering crushing grinding mechanical process.

(3) the iron content slag after drying and dewatering is entered disintegrating machine and carry out pulverizing milled processed, particle size after cracking 1 below ㎜; This step does not change the iron-holder of iron content slag, is just separated further with waste material by iron substance.

(4) the iron content slag pulverizing milled processed separation is entered high-efficiency dry powder magnetic separator to screen, obtain the slag of iron-holder more than 60 percent, be directly used in STEELMAKING PRODUCTION, remaining discarded slag as production cement, make non-burning brick, the raw material such as to repair the roads.

Claims (1)

1. a steel slag dry magnetic separation technique, carry out in the steps below:

(1) steel slag of iron-holder more than 30 percent is entered powerful magnetic separator, by powerful magnetic field, under centrifugal action, isolate the iron content slag of iron-holder more than 45 percent and discarded object;

(2) the iron content slag of iron content more than 45 percent is entered dryer and carry out drying and dewatering process, after drying and dewatering, iron content slag water content is 3%;

(3) the iron content slag after drying and dewatering is entered disintegrating machine and carry out pulverizing milled processed, particle size after cracking 1 below ㎜;

(4) the iron content slag pulverizing milled processed separation is entered high-efficiency dry powder magnetic separator to screen, obtain the slag of iron-holder more than 60 percent, be directly used in STEELMAKING PRODUCTION.