CN109777950A - Sintered at ultra low temperature mineralising additive for saving energy - Google Patents

Abstract

The invention discloses a kind of sintered at ultra low temperature mineralising additive for saving energy, it contains ultralow temperature mineralizer 1-60%, oxygenation agent 10-30%, fusing agent 10-40%, catalyst 10-40%, pore former 0-30%;Above-mentioned substance is crushed to less than lmm powder below, obtains additive through being mixed 3 minutes.Additive of the invention has catalytic combustion-supporting, inhibits sintering process 2Ca0₂、SiO₂Bad crystal transfer promotes sinter main binding item SFCA and forms and inhibit low temperature reduction degradation effect, enhances the process of catalysis sintering process, reduce the fuel of sintering process and use electric consumption.

Description

Sintered at ultra low temperature mineralising additive for saving energy

Technical field

The present invention relates to a kind of additive of metallurgy sintered pelletizing, it is mainly used for improving the metallurgical performance and section of sinter It can consumption reduction.

Background technique

It is well known that the main purpose of agglomerates of sintered pellets production, is exactly that the granular material sintering containing iron powder is blocking, is high Furnace, which is smelted, provides the enriched ore of metallurgical performance that have certain particle size composition and good.But in long-term sintering production process In, high temperature is generated after always relying upon a large amount of supplying solid fuel ignitions, will be generated after the fusing of miberal powder, flux and other granular materials A large amount of liquid phases in cooling procedure bond granular material by these liquid phases blocking.With the development of sintering theory, gradually propose With promoted and applied low temperature sintering technology, be negated and generate a large amount of liquid phases merely by high temperature miberal powder is bonded to blocking method.It is low Temperature sintering is exactly the proportion by reducing carbon, makes sintering process under lower temperature conditions, forms a large amount of needle-shaped compound calcium ferrite (SFCA), with this as main binding phase, the various performances of sinter can be improved and reduce energy consumption.It is more in present technology Several attention pellet forming process processes improve sintering process gas permeability and reach energy saving purpose by improving pelletizing quality.But it often neglects Depending on entire sintering overall process, especially sintering temperature is difficult to control.Realize that low temperature is burnt therefore, it is necessary to study one kind and can control The normal condition of knot can enhance the additive of sintering process beneficial again to meet increasing ironmaking requirement.

Summary of the invention

The purpose of the present invention is to provide a kind of sintered at ultra low temperature mineralising additive for saving energy, can be reduced using the additive Mixture melting temperature improves raw material self-characteristic, sintering velocity, and mineralization degree improves finished product mineral amount with this, reduces coal-fired Dosage.

To achieve the above object, sintered at ultra low temperature mineralising additive for saving energy provided by the present invention, including it is selected from ultralow temperature The mixtures such as mineralizer, oxygenation agent, fusing agent, catalyst, pore former, mix according to a conventional method.The active principle and contain Amount are as follows:

Ultralow temperature mineralizer 10-60%

Oxygenation agent 10-30%

Melt agent 10-40%;

Catalyst 10-40%;

Pore former 0-30%;

All percentages are weight percent.

The content preferred scope of the component:

Ultralow temperature mineralizer 30-60%;

Oxygenation agent 10-30%;

Melt agent 10-30%;

Catalyst 10-30%;

Pore former 10-30%;

All percentages are weight percent.

The content optimum range of the composition:

Ultralow temperature mineralizer 40%;

Oxygenation agent 20%;

Melt agent 20%;

Catalyst 20%

Pore former 5%;

All percentages are weight percent.

The additive of the invention: it is less than 1mm powder form below.

The ultralow temperature mineralizer is selected from borax, and boric acid contains boron substance.Preferably borax, boric acid, advantage table Present resource is wide, price is low.

The effect of ultralow temperature mineralizer is to promote solid phase reaction, reduces liquid phase viscosity, destroys the brilliant around rush of silica Into the chemical combination of itself and calcium oxide, the generation of free calcium oxide is avoided, accelerates the generation of clinker, improves the mineralising grain of finished product mine Degree.

The oxygenation agent is selected from potassium nitrate, sodium nitrate, calcium nitrate, sodium nitrite, sodium perchlorate, potassium permanganate class.It is excellent Be selected as sodium nitrate, it is contemplated that oxygen decomposition amount in heating process, the height of price, safety and stability in use etc. it is many because Element.

The effect of oxygenation agent is that heating reaches to start to decompose after certain value and releases oxygen in mixture, thus adjusts mixture Burning condition, promote pellet burning velocity and " grilling thoroughly " effect, avoid chemically incomplete combustion.

The fusing agent is selected from fluorite class low melting point, such as fluorite or cuspidine.Preferred size is less than 0.25mm firefly Mountain flour.

The effect of fusing agent is that reducing rod conjunction feed liquid mutually generates temperature.

The catalyst is selected from alkali metal substance, such as or mixtures thereof one kind of KC1, NaC1.

The effect of catalyst is the combustion process by the catalysis of alkali metal substance, vaporized carbon.

The pore former be expanding material, selected from polyvinyl chloride organic material, frog stone, perlite one kind or its mix Close object.Preferably polyvinyl chloride organic material or perlite.

The additive is ground into < 1 mm powder below, ' be mixed in its ratio mix within 3 minutes to get It is dispensed to finished product.

The dosage of the additive is ten thousand/3-7 of finished product sintering or pellet dosage.

The positive effect of the present invention is: first is that in sintered at ultra low temperature mineralising additive for saving energy injection water, after stirring It is sprayed in mixture, is uniformly distributed in raw material.During the sintering process, temperature gradually rises, and oxidant gradually decomposes, and is formed Opposite: " oxygen-rich area ", while catalyst also starts working, thus promote the burning velocity of pellet and fire saturating effect, and Reduce the requirement to coal-fired grade: and due to the effect of ultralow temperature mineralizer and fusing agent so that dissociating in sintering or pellet Calcium oxide content is greatly lowered, due to the effect of pore former burnt after high temperature or pellet in form hole, thus effectively Improve the quality of sintering or pellet.Two additives are the catalyst based on alkali metal, the oxygenation based on nitrate Agent, with containing based on boron substance mineralizer and other a variety of inorganic substances for being conducive to sinter strength raising form.Each component Proportion has comprehensively considered the influence to entire sintering process, has catalytic combustion-supporting, inhibits sintering process 2CaO₂、SiO₂, bad crystalline substance Type transformation promotes sinter main binding phase SFCA and forms and inhibit low temperature reduction degradation effect, fortifying catalytic sintering process Process.

Specific embodiment

Below in conjunction with embodiment, the present invention is further illustrated.

Embodiment 1

Raw material is chosen by weight percentage:

Ultralow temperature additive, which is selected, claims sand 40%:

Oxygenation book selects sodium nitrate 20%:

It melts agent and selects Fluorspar Powder 20%;The wherein granularity of Fluorspar Powder < 0 .25mm;

Catalyst selects NaCI 15%;

Pore former selects frog stone 2%.

Its method: above-mentioned substance is crushed to < l mm hereinafter, be mixed in proportion 3 minutes be additive finished product, point Dress.

Embodiment 2

Raw material is chosen by weight percentage

Ultralow temperature additive selects boric acid 30%;

Oxygenation agent selects sodium perchlorate 20%;

It melts agent and selects fluorite 18%;

Catalyst selects KC1 18%;

Pore former selects polyvinyl chloride 14%.

Its method is identical with embodiment 1.

Embodiment 3

Raw material is chosen by weight percentage:

Ultralow temperature additive selects borax 40%;

Oxygenation agent selects potassium permanganate 10%;

It melts agent and selects fluorite 25%;

Catalyst selects KC1, NaC1 15%;

Pore former selects frog stone, perlite 10%.

Its method is identical with embodiment 1.

It is incorporated in sinter mixture after 1 additive of the embodiment of the present invention is mixed with water by a certain percentage and sufficiently stirs again It mixes and is sintered cup test, test result can be found out by subordinate list.

Note: it is not doping test result that experiment group number, which is 0,.

By experimental result it can be seen that fuel consumption can be reduced using additive of the invention, improve vertical sintering speed Degree, sinter strength are improved, improve sintering production efficiency, reduce sintering mine FeO, and the fully optimized of the above index improves The metallurgical performance of furnace sinter reduces sintering production cost.

It carries out in addition, same method can be used in the additive of the embodiment of the present invention 2 or 3 using test.

Claims (3)

1. sintered at ultra low temperature mineralising additive for saving energy, it is characterized in that containing component and content (weight percent), according to a conventional method It mixes:

The ultralow temperature mineralizer of 10-60%, 10-30% oxygenation agent, 10-40% melt agent, the pore-forming of 10-40% catalyst, 0-30% Agent;The ultralow temperature mineralizer is selected from or mixtures thereof borax or one kind of boric acid;The oxygenation agent be selected from potassium nitrate, Or mixtures thereof sodium nitrate, calcium nitrate, sodium nitrite, sodium perchlorate, one kind of potassium permanganate;The solvation is selected from fluorite; The catalyst is or mixtures thereof one kind selected from KCI, NaC1;The pore former is selected from polyvinyl chloride, frog stone, perlite Or mixtures thereof one kind.

2. additive according to claim 1, it is characterized in that ultralow containing component and content (weight percent) 30-60% Warm mineralizer, the oxygenation agent of 10-30%, the fusing agent of 10-30%, the catalyst of 10-30%, the pore former of 10-30%.

3. additive according to claim 1, it is characterized in that the additive is less than 1mm powder form below.