CN1069769A

CN1069769A - The comprehensive utilization of blast furnace waste

Info

Publication number: CN1069769A
Application number: CN91105706A
Authority: CN
Inventors: 栾峰
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-08-23
Filing date: 1991-08-23
Publication date: 1993-03-10

Abstract

A kind of method of comprehensive utilization of the iron content waste materials containing carbon that iron-smelting blast furnace is discharged is characterized in that with magnetic plant the iron content waste materials containing carbon choosing of dust-like being divided into iron content and two kinds of raw materials of carbon containing.Iron-bearing material can be used for sintering, and ironmaking is until foundry goods or ingot casting; Carbon raw material adds an amount of coal dust, oxygenant, ignition dope and unselected clay, is pressed into spherical compound fuel, for industry and civilian.Decontamination, comprehensive utilization has certain economic benefits and social benefit.

Description

The comprehensive utilization of blast furnace waste

The invention belongs to chemistry, metallurgy, be used for the comprehensive utilization of the iron content waste materials containing carbon of iron-smelting blast furnace discharge.

It is investigated that contain materials such as a spot of iron, carbon and silicon in the waste material that some iron-smelting blast furnace is discharged at present, these waste materials mostly are the minimum mud shape thing of particle, the vapour permeability extreme difference, dehydration is difficulty especially; Again because of iron-holder is low, thus be difficult for being reused, and a large amount of the abandonment.Some simple sintering processs occurred when near, iron-containing waste has been able to the small portion utilization, but still abandoned of major part, both land occupation, contaminate environment again.

The purpose of this invention is to provide and a kind ofly with the iron content waste materials containing carbon separately improve content, become two kinds of raw materials of iron content, carbon containing of easy utilization.Iron-bearing material is used for sintering, makes sintered clinker, adds the instead of part ingot iron in right amount for blast furnace ironmaking or when casting molten iron; Carbon raw material adds an amount of subsidiary material, makes compound fuel, for industry and civilian production method.

The measure that the present invention takes is:

The quantity of the iron content waste materials containing carbon of discharging according to blast furnace is selected suitable magnetic plant for use, with magnetic plant the choosing of iron content waste materials containing carbon is divided, and improves content separately, becomes two kinds of raw materials of iron content and carbon containing.More because of the magnetic separation process factors, need to adjust on the spot, can obtain best fit; The iron-bearing material of selecting is added an amount of converter stove mud and iron scale etc., sinter grog into, purpose is to add in right amount when supplying blast furnace ironmaking and casting molten iron; Because of the cupola furnace furnace temperature can reach 1300 ℃, sintered clinker can be melted, after adding subsidiary material, iron, slag separate, molten iron instead of part ingot iron, but the quantity of slag is bigger, so furnace temperature higher with deslagging after, can strengthen the sintered clinker input amount, molten iron is cast foundry goods and ingot iron.

Carbon raw material is added vapour permeability fuel, make it accelerate dehydration, avoid the difficulty that is shaped; Adopt ventilation property fuel to be fibering finely ground particle substances such as the root of the saw foam of oven dry and comminuted plants, stem, leaf; Add an amount of coal dust, oxygenant, ignition dope and tackiness agent after the dehydration again, purpose is to make spherical compound fuel, for industry and civilian.Because of the major ingredient of carbon raw material is a coke powder, the purpose that adds coal dust is to reduce the burning-point of compound fuel, improves inflammableness and thermal value, add-on is determined on a case-by-case basis, and generally about 25%, low excessively effect is little, thermal value does not reach 4000 kilocalories/kg, and performance is bad; The too high cost that then increases.The oxygenant that adds is a potassium permanganate, and purpose is to improve the combustionproperty of compound fuel, forms chain reaction during burning:

Though the oxygen performance of putting of potassium permanganate is not so good as saltpetre, saltpetre generates potassium nitrite after putting oxygen, is carcinogenic substance, so can not select for use.Its add-on is generally 1%, can not surpass 5%, with heavy safety; The ignition dope that adds is the used oil, waste diesel behind the wash machine etc., its objective is and replenishes carbon raw material because of crossing the grease that water loses, and improves combustionproperty.Though the binding property of used oil, waste diesel is not as coal tar, because of coal tar also is carcinogenic substance, so can not select for use.Its add-on is about 0.5%, and is very few, acts on for a short time, excessive, easily produces black smoke, contaminate environment.The tackiness agent that adopts is a unselected clay, the wide model of originating, get easily; Generally about 25%, very few, binding property descends its add-on, disperses; Too much, vapour permeability descends, and reduces thermal value.

Accompanying drawing is a process flow diagram of the present invention

The meaning of symbolic representation is as follows among the figure:

1-iron content waste materials containing carbon 2-magnetic separation 3-iron-bearing material 4-carbon raw material 5-adds stove mud and iron scale 6-sintering 7-and goes into stove melting 8-and add subsidiary material 9-deslagging 10-foundry goods or ingot casting 11-waste heat baking material 12-and add vapour fuel 13-dehydration 14-and add coal dust, oxygenant, ignition dope and clay 15-and be pressed into spherical compound fuel

Technical process of the present invention is:

Iron content waste materials containing carbon 1 is divided through magnetic plant 2 choosings, become iron-bearing material 3 and carbon raw material 4, its iron-holder is brought up to 57%-60% by former 20.2%-40.3%, and its carbon content can be brought up to 44.2%-63.8% by 28%-42%.With the converter stove mud (iron content about 35%) and the iron scale (iron content about 67%) 5 of iron-bearing material 3 addings about 40%, make sintered clinker through sintering 6; Casting adds melting 7 in the stove during molten iron in right amount, with the instead of part ingot iron, adds subsidiary material 8 such as calcium oxide in good time, and behind the higher and deslagging 9, sintered clinker is the amount of increasing input suitably in furnace temperature, and with its melting, molten iron is cast foundry goods or ingot iron 10.The toroidal feed bin is installed on cupola furnace, is utilized waste heat baking material 11.

Carbon raw material 3 is added vapour permeability fuel 12, make its dehydration 13, add 25% coal dust, 1% oxygenant, 0.5% ignition dope and 25% unselected clay 14 again, after mixing and stirring, send into briquetting press, be pressed into spherical compound fuel 15, for industry and civilian.

The iron content waste materials containing carbon that utilizes among the present invention is mainly the dust of gravity blast furnace dust catcher and wet precipitator discharge, iron content 20.20%-40.36%, and carbon containing 28-42% contains silica 1 0.99%, calcium oxide 6.17%.The stove mud that also utilizes a small amount of steel-making converter to get rid of, the iron sheet that iron content 28%-50% and continuous caster, rolling mill are got rid of, iron content 65%-70%.

The invention process is easy, flexible, and can arrange production as the case may be scale and degree only need with a cover iron ore magnetic plant, and a briquetting press can be gone into operation.The product of different levels such as iron-bearing material, sintered clinker all has commodity value.When conditions being possessed, set up stirrer, agglomerating plant and molten iron equipment again, industrial scale and benefit also will increase.

The present invention has the certain social benefit aspect decontamination, aspect comprehensive utilization, certain economic benefits is arranged, and national middle-size and small-size iron and steel enterprise as utilizing, will be to compare great riches.

Claims

1, a kind of method of comprehensive utilization of the waste material that iron-smelting blast furnace is discharged is characterized in that described waste material is the carbonaceous dust-like waste material of iron content, with magnetic plant its choosing is divided, and improves content, becomes two kinds of raw materials of iron content and carbon containing.

2,, it is characterized in that with described magnetic plant be complete facilities such as the magnetic separator used of iron ore beneficiation and material pond by the described method of comprehensive utilization of claim 1.

3, by the described method of comprehensive utilization of claim 1, it is characterized in that described iron-bearing material is added the stove mud of an amount of steel-making converter discharge and the iron scale that rolling mill is discharged, after mixing and stirring, make sintered clinker.

4,, it is characterized in that when the casting molten iron, sintered clinker being dropped in the cupola furnace in right amount the instead of part ingot iron by the described method of comprehensive utilization of claim 3.

5, by the described method of comprehensive utilization of claim 1, it is characterized in that described carbon raw material is added the small-particle vapour permeability fibrous matters such as root, stem, leaf of saw foam after an amount of dehydration, comminuted plants, carbon raw material is dewatered as early as possible, thereafter add an amount of coal dust, oxygenant, ignition dope and unselected clay, after mixing and stirring, be pressed into spherical compound fuel.

6, by the described method of comprehensive utilization of claim 5, it is characterized in that described oxygenant is a potassium permanganate, utilize oxygenant to be subjected to heat release oxygen vapour, improve combustionproperty, burning forms chain reaction.

7, by the described method of comprehensive utilization of claim 5, it is characterized in that described ignition dope is used oil, the waste diesel behind the wash machine, utilize its inflammableness to replenish carbon raw material because of crossing the grease that water loses.

8, by the described method of comprehensive utilization of claim 4, it is characterized in that the toroidal feed bin is installed on described cupola furnace, utilize waste heat baking material.