CN1664117A

CN1664117A - Process for preparing directly reduced iron

Info

Publication number: CN1664117A
Application number: CN 200510065425
Authority: CN
Inventors: 刘南
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-04-02
Filing date: 2005-04-02
Publication date: 2005-09-07

Abstract

The invention belongs to metallurgical smelting field, which in detail relates to apreparing method for producing direct reduced iron. The invention employs a new preparing method of adding binding agent and catalyst, which not only forms various solid shapes because of the adhesive action and gives up the moulds fed in tubular shape in the traditional process; but also generates cracking and explosion and intensifies the reducing atmosphere, which increases the product reduction degree and increases the reduction speed and improves the quality and quantity of the product, the degree of metallization is increased by 2%. The invention is characterized in that it improves the mechanization level, decreases the pollution, lowers the intensity of labor, the cost of a single human is decreased by 18%, the consumption of concentrate iron ore can be decreased by 0.1%, the production cost is lowered and the economical benefit is increased; the accommodation area is reduced by 30% at the same scale of production; the density of product is larger than 4.0g/cm3-5.5g/cm3 after the chill-pressing, increases the user's yield and the utilization effect is also dramatically improved.

Description

A kind of preparation method who produces direct-reduced iron

One, technical field:

The invention belongs to field of smelting metallurgical iron, relate to a kind of preparation method who produces direct-reduced iron specifically.

Two, background technology:

The method of domestic production direct-reduced iron is a lot of now, but still adopts traditional-handwork mould tube technology mode to produce reduced iron always.

This production technique is through oven dry the smart powder of iron, obtain water content less than the smart powder of 1% dried iron, after the cooling, in roasting pot, pack in the die hole with a mould tube (can be annular cylinder, bar-shaped combination cylindricality fan dress cylindricality, prismatic shape, cellular cylindricality etc.) the smart powder of the dry and cold iron of the shape that will loose, the remaining part that then reductive agent is added roasting pot, take out mould, a material roasting pot is finished, after advancing the kiln roasting, topple over the material roasting pot, clean spongiform direct-reduced iron by hand with water, form the product sponge iron, above-mentioned preparation method has the following disadvantages:

1, mechanical automation degree is low, and the dress roasting pot is manual fully to be finished.Human factor causes unstable product quality, and in assembling process, the smart powder of iron is excessive, makes product and roasting pot adhesion easily, and it is big to cause product ton consumption roasting pot to decrease, and production cost increases, and reduces benefit;

2, being not suitable for scale operation starts.Because floor space is big, the Flow of Goods and Materials distance is big, and production efficiency is low, and labour intensity is big, causes material loss big simultaneously, increases the product ton unit consumption of the smart powder of main material iron, increases production cost, reduces benefit;

3, smart powder of iron and reductive agent be in assembling process, can not strict separation station, cause two kinds of mixing of materials, and make the smart powder of main raw material(s) iron not recycle.Even separation costs is too big, do not meet the market economy rule, cause unnecessary waste.

4, the assembling of dried shape material and unloading clearly causes airborne dust easily, influences operating environment, causes workman's physical and mental health.

5, behind the product pint pot, the shape irregularity is cleaned necessary handwork with water, and human factor causes product appearance poor quality, and airborne dust is big, pollutes greatly, and environment is poor.

6, product is spongy, and porous, density are 1.8g/cm ³-2.0g/cm ³, less than slag density, come-up is serious, reduces the recovery rate in the steelmaking process.And storage, transportation, waterproof etc. are all not convenient.

Three, summary of the invention:

The objective of the invention is to adopt a kind of new preparation method to add tackiness agent, catalyzer, form various solidification shape, do not re-use the die canister filling method of traditional technology, strengthened the product reducing degree, improve the mechanical automation degree, improve Working environment, reduce labour intensity, improve product quality and yield, reduce production costs, increase economic benefit, improve user's recovery rate.Under equal industrial scale, floor space reduces 30% than old technology, and product density is greater than 4.0g/cm ³-5.5g/cm ³

The objective of the invention is to realize by following technical scheme:

A kind of preparation method of direct production reduced iron, major ingredient is the smart powder of iron, be characterized in: the preparation method is as follows:

At first the smart powder of iron is dried, the smart powder water content of the iron of oven dry is less than 6%, the organic binder bond and the content that add content then and be 0.5%-2% in the smart powder less than 6% iron are the alkali metal salt catalyst of 0.5%-1%, after brute force stirs, break into diffusing shape, be squeezed into solid shape, pack in the roasting pot by being detained cold solid guider again by 100 tons of extrusion machines, add reductive agent, dress up the finished product batch can, advance the kiln roasting, behind the kiln discharge, in toppling over the roasting pot zone, adopt weary grey wind-force dust removal installation, get rid of a jar interior weary grey part, take out regular spongy direct-reduced iron, clean surface and bore portion with water through the comprehensive machine of leveling, clean with water finish after, through jaw crusher, form piece grain powdery, utilize the brain architecture of self, it is meshing to cold pressing through 300 tons hydraulic efficiency installation, forms density greater than 4.0g/cm ³-5.5g/cm ³The direct-reduced iron cold pressing block, promptly get product of the present invention.

Because the present invention has used tackiness agent and catalyzer, has not only played cohesive action, and in process of product development, produce the cracking explosion, reducing atmosphere and reduction atmosphere are strengthened, strengthened the reducing degree of product, reduction rate is accelerated, and then has improved the output and the quality of product.Degree of metalization can improve 2%, because in extrusion process, molding to a certain extent, compare with iron powder in bulk, density increases in the equal volume, and single jar of output increases naturally, increases output 11%, mechanization degree increases, the human-based unit consumption can fall 18%, and the unit consumption of the smart powder of iron can reduce 0.1%, and direct-reduced iron density increases 55%-175%, improve user's recovery rate, result of use also is significantly improved.Reduce environmental pollution.

Four, embodiment:

Embodiment:

Moisture be 9%--14%, grade is that water content be less than 6% with drying plant with this oven dry greater than the smart powder of 66.5% iron, after the dry-type magnetic extractor magnetic separation, obtains grade greater than the smart powder of 67% iron again, is used starting material.

With these starting material 13.6kg that weighs, add content and be 1.5% tackiness agent (organic binder bond) and content and be 0.6% catalyzer (an alkali metal salt) 120ml altogether, after stirring with machine,massing, break into diffusing shape, be transported in 100 tons of hydroforming automatization fillers, formation garden ring solid shape, again through being detained the cold solid guide pipe roasting pot of packing into, rest part in jar adds reductive agent, then jar is pushed in 1180 ℃ the kiln, with after the roasting in 8--12 hour, from jar, pour out product 10kg, through the comprehensive machine of leveling, to level, piece grain powdery is broken in Hubei Province, again through 300 tons hydro-forming machine, rerum natura through product itself is cold-pressed into Φ 110mm, density 4.5g/cm ³, weight is two direct-reduced iron cold pressing blocks of 5kg.

Claims

1, a kind of preparation method of direct production reduced iron, major ingredient is the smart powder of iron, be characterized in: the preparation method is as follows: