CN103031410B

CN103031410B - Method for treating desulfuration residue by preparing efficient blocker with waste materials of steelmaking

Info

Publication number: CN103031410B
Application number: CN201110385848.7A
Authority: CN
Inventors: 俞海明; 王伟; 陈跃军; 解英明; 段建勇; 兰飞鹏; 王瑞利; 胡永胜; 姜新平; 钟文斌
Original assignee: Xinjiang Bayi Iron and Steel Co Ltd
Current assignee: Xinjiang Bayi Iron and Steel Co Ltd
Priority date: 2011-11-29
Filing date: 2011-11-29
Publication date: 2014-04-02
Anticipated expiration: 2031-11-29
Also published as: CN103031410A

Abstract

The invention provides a method for treating desulfuration residue by preparing an efficient blocker with waste materials of steelmaking i.e. the industrial wastes generated in the steelmaking, comprising the steps of: based on the tundish coating adhered on the tundish casting residual as a main component and the refining white slag and part iron oxide as auxiliary components, preparing in the ratio of (72-78): (15-25): (4-6) in mass percentage, and sintering for 30-240s at the temperature of 850-1450 DEG C to obtain the blocker; and blowing a desulfurizing agent to iron ladles by utilizing desulfuration equipment, carrying out drossing after finishing the desulfuration, spreading the blocker once every drossing at the consumption of the blocker being 1.4-1.6kg/ton of iron, carrying out the drossing again and spreading the blocker again to ensure that the desulfuration residue and iron liquid in a residue tank are separated from the last residue liquid and the desulfuration residue becomes fragile individuals which are convenient for recycling. The method is undoubtedly capable of providing technical support and service for the energy saving and the consumption reduction of enterprises.

Description

A kind of steel-making rejected material that utilizes is prepared the method that efficient blocker is disposed desulfurization slag

Technical field

The present invention relates to the slag processing that iron and steel is manufactured, the slag charge of recycling, through processing again of science simple and easy method, turns waste into wealth, for exemplary role has been played in energy-conservation, the reduction of discharging of enterprise.

Background technology

In Desulfurization by injecting method and mechanical mixing method sweetening process, the general desulfurization slag that produces 9～15kg/ ton, these desulfurization slag enter electric furnace or converter, can cause the increase of the quantity of slag in stove smelting process, and the fluctuation of the sulphur content of molten steel, so these desulfurization slag must claw hot metal ladle timely, in the process of skimming, can inevitably make iron liquid enter slag ladle, make not to be that the iron liquid clawing with batch iron bag can interpenetrate, solidify and form bulk, be difficult to fragmentation, cause most of desulfurization slag bulk discarded, become a kind of waste.Current many producers adopt desulfurization slag blocker,, after a bag molten iron drossing enters slag ladle, add blocker in slag ladle on the top of the slag, carry out skimming next time, but the starting material that the blocker of these types needs preparation, and cost is higher.

The present invention's design utilizes the discarded raw material of steelworks, prepare blocker and implement and dispose, after a molten steel pocket deslagging, be added on the top of the slag of slag ladle, then carry out skimming next time, this material is sintered into ceramic phase, plays the desulfurization slag and the iron liquid that before and after intercepting, enter slag ladle, prevent that them from solidifying out into a reluctant bulk, become and hold breakable single individuality; I.e. convenient recovery, consumption reduction, the Energy Conservation of You Wei enterprise have supplied technical support.

Summary of the invention

Order of the present invention is: utilizing blocker to dispose the method for desulfurization slag, the desulfurization slag of iron and steel manufacture is fully utilized, is enterprise's create beneficial result, uses this agent to compare with traditional blocker below cost to 850 yuan/ton.

The object of the present invention is achieved like this: a kind of steel-making rejected material that utilizes is prepared the method that efficient blocker is disposed desulfurization slag, the industrial waste that utilizes steel-making to produce, be about to the remaining tundish paint adhering to of tundish casting as main component, the ferric oxide of refining white slag and part, as ancillary component, is prepared with mass percent 72-78:15-25:4-6; Through 850-1450 ℃, the sintering of 30-240 second, obtains blocker; Utilize sweetener to the agent of hot metal ladle blowing desulfurization, after desulfurization finishes, implement to skim, every end is once skimmed, and artificial evenly throwing is spread blocker once, and consumption is 1.4-1.6kg/ ton iron, make to form sealing coat on its top of the slag, desulfurization slag and iron liquid is separated with slag liquid layer layer last time, become frangible layer, be convenient to recycle;

Wherein sweetening agent is by deactivating magnesium powder or aluminium powder 3-5kg/ ton iron, and passive lime powder 4-8kg/ ton iron forms; Adopt spray gun or stirring rake to insert bottom in iron bag or fish torpedo ladle and implement blowing desulfurization, the time is 8～15min;

Above-mentioned sweetener is applicable to the blowing process of deactivating magnesium powder or the working conditions of KR mechanical mixing method.

The method of described desulfurization slag, compares this agent with traditional blocker, below cost to 850 yuan/ton, realized the recycle of industrial waste.

Basic conception of the present invention, to utilize the theory of dissipative structures and crystal boundary engineering philosophy, by the discarded raw material of steelworks, be prepared into blocker, when skimming, be added on the top of the slag, make different batches clinker separated, played the technical barrier that intercepts the interior desulfurization slag of slag ladle and iron liquid caking, for making full use of of desulfurization slag, provide new way.

Blocker of the present invention prepare material, derive from the trade waste of steelmaking system, tundish use after discarded coating be principal constituent, the ferric oxide of refining white slag and part is ancillary component, it is prepared by mass percentage, through sintering, gets product; The ceramic phase that the use of this agent forms, makes slag separated layer by layer, plays the effect of blocking-up, shows technical progress.

Embodiment

The present invention is further described in conjunction with the embodiments.

Embodiment

One, the raw material sources of blocker and composition

1) in steelmaking process, after one of continuous caster waters time end, in tundish, leave part casting residual molten steel, after casting residual molten steel solidifies, must rout up from tundish introversion, at this, tumble in process, the coating that tundish bag wall is smeared, some strips down from inwall, be scattered in bag tilting machine below, become industrial refuse; Some sticks on the casting residual molten steel surface that tundish solidifies, in the course of processing, use machinery or manually from the remaining cold steel of tundish casting, strip down, become industrial refuse, the amount that these two portions produce is 12-15kg/ ton steel, this two-part industrial refuse is collected, can obtain preparing the main component of blocker;

2) another approach is molten steel after LF ladle furnace refining is processed, and top slag is generally white slag, and these white slags are after molten steel casting finishes, be used as slag and enter slag field, become industrial refuse, its generation is 9-15kg/ ton steel, obtains the added ingredients refining white slag of blocker;

3) in steelmaking process, continuous casting system can produce a ton iron scale of steel 3kg, conventionally in the eddy flow well of steel-making water treatment system, use and pick up, leave in special-purpose iron scale pond, its main component is ferric oxide, can be used as the added ingredients of blocker; In the oxyacetylene metal-cutting process of this external heavy scrap, the added ingredients that the cutting slag of generation also can be used as blocker intermediate oxidation iron is used.

Two, the preparation of blocker

1) industrial waste that utilizes steel-making to produce, the discarded coating of tundish is main component, the ferric oxide of refining white slag and part is added ingredients, with mass percent 75:20:5 preparation, through 1200 ℃ of sintering 210 seconds, obtains blocker;

2) utilize blowing desulfurization equipment (or KR sweetener), the double BUP blowing desulfurization production line that company of Wei Zhongye CCID provides, implements blowing desulfurization or mechanical mixing method desulfurization, and the raw material of its use is with deactivating magnesium powder or aluminium powder 4kg/ ton iron; Passive lime powder 6kg/ ton iron; After molten iron arrives desulfurization station, use spray gun or stirring rake to insert bottom in iron bag or fish torpedo ladle, winding-up deactivating magnesium powder or aluminium powder, also have passive lime powder, carry out desulfurization operations, winding-up is stirred 10min and is finished, and then enters the technique of skimming.

The disposal of three, skimming

1) after skimming, adopt artificial evenly throwing to spread blocker 1.5kg/ ton iron (amount of desulphurised hot metal) at every turn, make to form ceramic phase on the top of the slag of blocker in slag ladle, play partition effect; Originally the slag blanket layer of piling up is separated, be convenient to strike and pound recovery.

2) after slag ladle is taken off completely, roping is fetched water cooling to slag field, and tank body temperature is cooled to below 50 ℃, turns over tank operation.

Four, economic benefit

This blocker is compared with traditional blocker, below cost to 850 yuan/ton; Desulfurization slag, after dropping hammer of slag field impacts, is recycled, and iron cost efficiency per ton more than 2500 yuan, is realized the recycle of industrial refuse in factory.

Figure 2011103858487100002DEST_PATH_IMAGE002

Claims

1. one kind is utilized steel-making rejected material to prepare the method that efficient blocker is disposed desulfurization slag, it is characterized in that: the industrial waste that utilizes steel-making to produce, be that the remaining tundish paint adhering to of tundish casting is as main component, the ferric oxide of refining white slag and part is as ancillary component, with mass percent 72-78:15-25:4-6, prepare, through 850-1450 ℃, the sintering of 30～240 seconds, obtains blocker; Utilize sweetener to hot metal ladle blowing desulfurization agent desulfurization, after finishing, implement to skim, every end is once skimmed, artificial evenly throwing is spread blocker once, consumption is 1.4-1.6kg/ ton iron, makes to form sealing coat on its top of the slag, and desulfurization slag and iron liquid is separated with slag liquid layer layer last time, become frangible layer, be convenient to recycle;

Wherein sweetening agent is by deactivating magnesium powder or aluminium powder 3-5kg/ ton iron, and passive lime powder 4-8kg/ ton iron forms; Adopt spray gun or stirring rake to insert bottom in iron bag or fish torpedo ladle and implement blowing desulfurization, the time is 8-15min;