CN106076506A

CN106076506A - A kind of process technique of slag deep processing

Info

Publication number: CN106076506A
Application number: CN201610444839.3A
Authority: CN
Inventors: 李轶
Original assignee: Zhenjiang Xin Steel Co Ltd
Current assignee: Zhenjiang Xin Steel Co Ltd
Priority date: 2016-06-20
Filing date: 2016-06-20
Publication date: 2016-11-09

Abstract

The invention discloses the process technique of a kind of slag deep processing, steel scoria magnetic separation product is sent into ball mill and adds water, naturally drain through ball mill exhaust end after being fully ground, it is divided into sieve through drum sieve again and above and sieves lower two products, oversize sub-elects block ferrum and tailings through magnetic pulley, after block ferrum drying machine is dried, water content is kept to less than 2%；The classified machine of undersize sub-elects overflow and sand return, classifier overflow grade is controlled by the size controlling shower water, and then control grader sand return grade, sand return enters fine powder powder groove by belt-conveying, classifier overflow is pumped up to thickener, and thickener underflow enters tail powder powder groove after being filtered by filter.Present invention, avoiding the material loss of non magnetic or weak magnetic, make material recycle more fully, more thorough.Granulated iron iron-holder is brought up to more than 90% by 60%～65%, and magnetic separation grade is brought up to more than 60% by 40%～50%, improves the iron-holder of slag product comprehensively, improves the comprehensive utilization ratio of slag.

Description

A kind of process technique of slag deep processing

Technical field

The present invention relates to a kind of Technology of Steel Slag Processing, be that steel scoria magnetic separation product (granulated iron and magnetic separation) is added by one deeply The technique of work.

Slag is the waste residue got rid of in steelmaking process.Slag is mainly derived from shape after element oxide contained by molten iron and steel scrap The oxide become, the impurity that metal charge is brought into, the slag former of addition such as limestone, fluorite, Silicon stone and oxidant, desulfurization are produced Thing and the furnace lining material etc. being etched.According to the difference of the steel-making type of furnace used, slag is divided into converter slag, open hearth slag and electric furnace Slag.At present, domestic Slag Processing Technology is single, and commonly used crushing-magnetic selection sorts, as existing in Anshan iron and steel plant one 2,400,000 Ton/year magnetic separation processing line is used for processing slag produced by converter.This production line uses two sections of broken two sections of magnetic pulleys to sort, choosing Concentrate product after not recycles again, and the product from failing (steel scoria magnetic separation product) sorted is granulated iron and magnetic separation.Production line year About 100,000 tons of output granulated iron, the iron-holder of granulated iron is 60%～65%, and because the fluctuation of its basicity is big, the recycling of loopback blast furnace is deposited At certain difficulty；Production line year output magnetic separation about 40,000 tons, magnetic separation grade 40%～50%, it is impossible to directly as blast furnace The raw material produced, can only do agglomerates of sintered pellets and add raw material, returns sintering and reuses, but recovery utilization rate is relatively low.Accordingly, it would be desirable to Process further to steel scoria magnetic separation product improves steel slag utilization rate.Although number of patent application is the patent of invention of 00123358.0 Disclose a kind of steel slag magnetically dressing and re-treating process, but owing to the dressing method of this technique is only with magnetic separation, to non magnetic or weak The ferrous material of magnetic can not sort out in time, causes a certain amount of metal loss.

It is an object of the invention to provide a kind of steel scoria magnetic separation product (granulated iron and magnetic separation) purifying technique, it is to avoid non magnetic Or the material loss of weak magnetic, make material recycle more fully, more thorough, improve steel slag utilization rate.

The object of the present invention is achieved like this, the process technique of a kind of slag deep processing, it is characterised in that by slag magnetic Selecting product send into ball mill and add water, the metallic iron being fully ground in rear material separates with other materials, in the effect of water flowing Under, naturally draining through ball mill exhaust end, ball mill discharge is divided into sieve through drum sieve and above and sieves lower two products；Oversize warp Magnetic pulley sub-elects block ferrum and tailings, and block ferrum enters block ferrum intermediate bin, and tailings enters tailings storehouse, after block ferrum drying machine is dried, aqueous Amount is kept to less than 2%, enters block ferrum finished bin, and tailings is owing to returning to raw material cabin containing a small amount of metallic iron；Undersize warp Spiral classifier sub-elects overflow and sand return, is arranged over shower water at spiral classifier, by controlling the size of shower water Controlling classifier overflow grade, and then control grader sand return grade, grader sand return enters fine powder powder by belt-conveying Hopper, classifier overflow is pumped up to thickener, and thickener underflow enters tail powder powder groove after being filtered by filter.

Owing to the present invention uses the method that gravity treatment combined with magnetic separation, it is to avoid the material stream of non magnetic or weak magnetic Lose, make material recycle more fully, more thorough, granulated iron iron-holder is brought up to more than 90% by 60%～65%, magnetic separation grade by 40%～50% brings up to more than 60%.Improve the iron-holder of slag product comprehensively, efficiently utilize steel slag resource, improve The comprehensive utilization ratio of slag, decreases environmental pollution, solves the problem taking a large amount of soil, to social creativity greatly Economic benefit.

Fig. 1 is technological process apparatus image contact figure.

The present invention is further described with embodiment below in conjunction with the accompanying drawings.

The present invention is a kind of to purification technique of steel scoria magnetic separation product, is that (granulated iron contains 50～0mm steel scoria magnetic separation products with granularity Iron is 60%～65%, and granularity is 50～0mm；Magnetic separation grade is 40%～50%, and granularity is 5～0mm) it is raw material, warp Final generation three kinds of products, respectively block ferrum, fine powder, tail powder after sorting.This technique both can with individual processing granulated iron and magnetic separation, The mixed material of granulated iron and magnetic separation can also be processed.

As it is shown in figure 1, be transported to sort workshop by automobile by raw material, give with frontloader and grind raw material cabin 1 feeding before slag, before mill slag Raw material is sent into ball mill 2 by sealing-tape machine, adds water and be made into the thing that concentration is 70%～80% while sending into raw material to ball mill 2 Material, after material is fully ground in ball grinding medium filling ratio is 30%～40% ball mill 2, makes the metallic iron in raw material and other things Matter separately, under the effect of water flowing, naturally drains through ball mill exhaust end, and ball mill discharge is 1.5mm's through screen size Drum sieve 3 is divided into two products, i.e. oversize and undersize.Oversize and undersize select through different technique Not.

Oversize is that 2000 oersted magnetic pulleys 5 select block ferrum (grade more than 90%, water content 10% through field strength Above) and two kinds of products of tailings, leave in respectively in block ferrum intermediate bin 4 and tailings storehouse 6.After block ferrum drying machine 7 is dried, aqueous Amount is kept to less than 2%, meets the technological requirement of steel mill, leaves in block ferrum finished bin 8, and finished product block ferrum is transported to steel-making through automobile Factory.The tailings selected due to containing a small amount of metallic iron, returns to raw material cabin 1 and re-starts and sort.

Undersize sub-elects overflow and two kinds of products of sand return (grade more than 60%) through spiral classifier 9.Sand return is passed through Belt-conveying enters fine powder powder groove 13, and fine powder is transported to sintering plant through automobile.Classifier overflow is pumped up to thickener 10, concentrates Machine underflow enters tail powder powder groove 12 after being filtered by filter 11, is transported to tailings field through automobile.

The overflow water of each operation in technological process backs within technological process circulation and makes after entering water treatment system process With.

Claims

1. the process technique of a slag deep processing, it is characterised in that steel scoria magnetic separation product sent into ball mill (2) and adds water, filling The metallic iron divided after grinding in material separates with other materials, under the effect of water flowing, naturally drains through ball mill exhaust end, Ball mill discharge is divided into sieve through drum sieve (3) and above and sieves lower two products；Oversize sub-elects block ferrum and tail through magnetic pulley (5) Slag, block ferrum enters block ferrum intermediate bin (4), and tailings enters tailings storehouse (6), after block ferrum drying machine (7) is dried, water content be kept to 2% with Under, entering block ferrum finished bin (8), tailings returns to raw material cabin (1)；Undersize through spiral classifier (9) sub-elect overflow and Sand return, is arranged over shower water at spiral classifier (9), controls classifier overflow product by the size controlling shower water Position, and then control grader sand return grade, grader sand return enters fine powder powder groove (13), classifier overflow by belt-conveying Being pumped up to thickener (10), thickener underflow enters tail powder powder groove (12) after being filtered by filter (11)；In ball mill The concentration of material is 70%～80%, and the ball grinding medium filling ratio of ball mill is 30%～40%, the sieve aperture >=1.5mm of drum sieve, The field strength of magnetic pulley is 2000～2500 oersteds.

Purification technique of steel scoria magnetic separation product the most according to claim 1, it is characterised in that steel scoria magnetic separation product is granulated iron, grain Degree≤50mm, granulated iron iron-holder 60%～65%.

3. according to claim 1 described purification technique of steel scoria magnetic separation product, it is characterised in that steel scoria magnetic separation product is magnetic separation Powder, granularity≤5mm, grade is 40%～50%.

4. according to claim 1 described purification technique of steel scoria magnetic separation product, it is characterised in that steel scoria magnetic separation product is granulated iron And magnetic separation, the wherein granularity≤50mm of granulated iron, iron-holder 60%～65%, the granularity≤5mm of magnetic separation, grade be 40%～ 50%.