CN1962898A

CN1962898A - Iron ore pellet organic binder and its using method

Info

Publication number: CN1962898A
Application number: CN 200510124435
Authority: CN
Inventors: 张振慧
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-11-10
Filing date: 2005-11-10
Publication date: 2007-05-16

Abstract

The invention discloses an additive and using method of artificial block-ore pellet ore, which is characterized by the following: using organic macromolecule with oxygen functional group and Al+++, Fe+++, Ca++ to form complex compound and chelate; forming fixed net-and-net cubic structure and astopic steam penetrating net of multiple active functional groups and soluble polymer; improving falling strength and dry strength and cracking temperature of green-ball; reducing returning ore obviously with strong binding power; improving production without adding ash.

Description

A kind of iron ore pellet organic binder and using method thereof

One, technical field: the present invention relates to a kind of pellet additive, is the improvement of pellet additive.Belong to additive and using method thereof that the pellet among the ferrous metallurgy industry ore agglomerates uses.

Two, technical background: along with the development of Iron And Steel Industry, the ironmaking desired raw material is more and more big, and can be less and less directly into the rich ore of stove, though especially China's iron ore reserves occupy the 5th in the world, wherein the rich ore of iron content more than 50% only accounts for 4%, the overwhelming majority is for containing the lean ore of harmful impurity, and this class ore is must fine grinding selected after agglomeration just can be gone into the stove smelting.Pellet is better than other ore agglomerateses with its excellent metallurgical performance and tangible blast-furnace smelting effect, causes the attention of domestic and international iron and steel enterprise day by day.Researching and producing of China's iron ore pellets starts from the fifties.Through the development of many decades, the development of and processing unit theoretical from balling-up is near foreign level, but the additive of balling-up is to continue to use traditional additive-slaked lime, Wingdale, wilkinite abroad always, at present based on wilkinite.External also have the A Ketai that uses pendant benefit and Ciba, is a kind of high polymer binder of high effect nontoxic, do not contain impurity such as S, P, and bond effect is better than wilkinite, and consumption is little, only is bentonitic 1/5～1/100.But finished ball ultimate compression strength is on the low side, and China does not still have producer and uses.

Wilkinite is as the history of the existing many decades of pelletizing additive.It is the high-quality additive that at present domestic and international pellet manufacturer generally acknowledges, it not only can improve the dropping strength of green-ball, the break temperature when especially improving the green-ball drying, but bentonitic shortcoming also is fairly obvious, wilkinite is a kind of inorganic mineral, mainly by SiO ₂65～70%, Al ₂O ₃26～28% form, and wilkinite is generally 1～4% in the add-on of pellet, has reduced the grade of the full iron of pellet.Increased the ash (SiO of pellet ₂+ Al ₂O ₃) reduced the reductibility of pellet, because of wilkinite is a kind of inorganic mineral, after roasting, still exist in the pellet, concerning pellet manufacturer, the full iron 1% of every reduction, less discount of ten per cent～30 yuan/ton, by the producer that produces 1000000 tons of pellets per year, year financial loss is more than 1,000 ten thousand yuan.Concerning iron and steel enterprise, the full iron grade of pellet is higher, under identical working condition, improve output, reduced the coke ratio energy consumption, gone into the measuring and calculating of stove according to the pig iron smelting fine fodder, full iron decline 1% of pellet or ash increase by 1%, coke ratio increases by 2%, and output descends 3%, is an enormous economic loss.

Three, summary of the invention: the object of the present invention is to provide a kind of energy to satisfy the additive of making ball performance and metallurgical performance and can improve compression strength of green pellet, dropping strength, dry strength, break temperature, do not reduce full iron grade, the organic additive that does not increase ash and using method thereof again.

The present invention is synthetic with one or more and humate in the water-soluble polymer of different physics-chem characteristics; Or water-soluble polymer polyvinyl alcohol (PVA), sodium starch glycolate (CMS), polyacrylamide (PAM), the synthetic SHN that is called for short of more than one in the polyoxyethylene (PEO).Water-soluble polymer contains ionic group, but have good hydrophilicity viscous water and multiple metal ion and form the heavy-gravity gel, can with the characteristic of the affine absorption of many materials, cohesion, drag reduction, bridging, the oxygen-containing functional group of humate macromolecular structure can be combined into complex compound and inner complex with multivalent metal cations such as Al+++, Fe+++, Ca++, form the three-dimensional arrangement of firm online screening, positively charged ion is had extremely strong adsorptive power, hydratability, cohesive force and good hydrophilicity, dispersiveness.Through the fine iron breeze of fine grinding, has great specific surface area, 1500～1900cm ²/ g; therefore also just has bigger surface energy; when they contact with surrounding medium; particle surface demonstrates static charge; the balance mode negative charge of static charge mainly at inner face and positive charge mainly in outer rim; water molecules there is adsorptive power; particle is drawn close mutually; owing to added shn in the breeze; form complex compound and inner complex with mineral powder granular after meeting water; constitute the three-dimensional arrangement of online screening; increased the plasticity-of breeze on the one hand; improved the processability of breeze; the aspect has increased cohesive force in addition; particle is drawn close more closely; pelletizing moisture content is oozed from inside to outside; therefore; the wet tenacity and the dry strength of pellet are greatly enhanced, owing to contain aromatic proton among the shn; hydroxyl; carboxyl; carbonyl; quinonyl; methoxyl group isoreactivity group, these active groups form has the ventilation property special to water vapor; thereby improved green-ball exsiccant burst temperature; because shn is organism,, only stay micro-ash in pellet at after-flame fully more than 800 ℃; so do not reduce the full iron grade of pellet, do not increase the ash of pellet yet.

Using method: be that carrier is made dispersed liquid with water 1,, its quality index: viscosity≤40 second (being coated with 4 glasss), solid substance≤8%, ton ball consumption≤4%.During use, on pan-pelletizer, spray and drip the balling-up that combines.SHN pellet additive liquid-type need use certain pressure to spray, and sets up pressure pump or rising additive storage tank reaches required pressure, and control balling-up breeze moisture content is less than 6.5%.2, make the solid state powder additive, being ground into-200 orders with the high grade iron breeze is that carrier is made pulvis, synthetic with in the water-soluble polymer one or more.Its proportioning: (a) fine iron breeze 50%, humate 10%, CMS25%, PAM14%, PEO1%.Its balling-up consumption 0.1%.(b) fine iron breeze 50%, humate 5%, CMS10%, PAM30%, PEO5%.Its balling-up consumption 0.1%.(c) fine iron breeze 90%, PAM5%, PEO5%, its consumption 0.4～0.5%.On stoving oven blanking port or belt, quantitatively add during use, and before balling-up, stir, control balling-up breeze moisture content 8.2～9.5% through feeding machine.

The present invention compared with prior art, the plasticity-that consumption is few, do not conform to impurity, cohesive force is strong, improved breeze, improved balling property, improve shatter strength of green pellet, wet tenacity and dry strength, improved green-ball exsiccant burst temperature, significantly reduced the rate of return mine, improved finished ball ultimate compression strength, simultaneously do not reduce full iron grade, do not increase detrimental impurity, ton ball cost is lower than wilkinite and has tangible economic benefit.

Embodiment 1 liquid-type

1, proportioning: humate 1%, pva1799:7%, pam0.1%, H ₂O90%, dispersion agent a little.

2, above raw material is dissolved in water respectively.

3, under agitation with three kinds of raw material synthesizing liquid SHN pellet additives.

4, using method: set up the additive hold-up vessel more than 2 meters at pan-pelletizer, allow its gravity flow spray and drip balling-up or pressure boost pump.Breeze moisture content should be controlled at less than 6% before the balling-up.Ton ball consumption is less than 3.5%.

Embodiment 2

1, proportioning: humate 1%, paa6%, pam0.1%, pva1799:3%, H ₂O90%, dispersion agent a little.

2, with humate, PAA,, PAM, PVA be water-soluble respectively earlier.

3, under agitation with four kinds of raw material synthesizing liquid SHN pellet additives.

4, using method: with embodiment 1

Embodiment 3

1, humate 1%, cms1%, pam0.1%, pva1799:5%, H ₂O90%, dispersion agent a little.

2, above raw material is dissolved in water respectively.

4, using method: with embodiment 1

Embodiment 4 solid state powder types

1, proportioning: fine iron breeze 50%, humate 8%, cms5%, pam30%, PEO7%.

2, fine iron breeze is dried to moisture content and be crushed to-200 orders less than 1%.

3, by proportioning with above raw material and fine ore uniform mixing shn pellet additive.

4, using method: quantitatively add through feeding machine on stoving oven breeze blanking port or belt, and stir before balling-up, the moisture content after the control breeze oven dry is less than 8.5%, its balling-up consumption 0.1%.

Embodiment 5

1, proportioning: fine iron breeze 50%, humate 5%, pam39%, PEO5%.

2, fine iron breeze is crushed to-200 order fineness.

3, by the uniform mixing of proportioning and iron essence powder, shn pellet additive.

4, using method: with embodiment 4, balling-up consumption 0.1%

Embodiment 6

1, proportioning: fine iron breeze 85%.PAM9%, PEO1%, humate 5%.

2, fine iron breeze is crushed to-200 order fineness, and moisture content is less than 1%.

3, with fully mixed even the SHN pellet additive of above proportioning.

4, using method is with embodiment 4, consumption 0.3～0.5%.

Claims

1, one or more in a kind of water-soluble polymer that uses different physics-chem characteristics and humate is synthetic or water-soluble polymer PVA, CMS, PAM, PEO in more than one synthetic SHN pellet additive, be the liquid and solid-state pellet additive abbreviation of carrier synthetic SHN with water and refined iron mine powder.Its feature: the oxygen-containing functional group of macromolecular structure can be combined into complex compound and inner complex with multivalent metal cations such as Al+++, Fe+++, Ca++, form the three-dimensional arrangement of firm online screening, possess hydrophilic property, complexing, ion exchangeable, oxidation-reduction quality; Contain hydroxyl, carboxyl, carbonyl, quinonyl, methoxyl group isoreactivity group, water vapor there is special ventilation property, can improve shatter strength of green pellet, dry strength and burst temperature, not reduce all iron content, do not increase the water miscible organic polymer pellet additive of ash.

2, the pellet additive of producing according to claim 1 is that carrier is made and liquidly used force (forcing) pump or rising hold-up vessel to spray through certain pressure from pan-pelletizer to drip a balling-up, its consumption≤4% with water.Its solid substance is more than 5%.The moisture of balling-up control breeze is less than 6% production method.

3, the pellet additive of producing according to claim 1 is carrier with fine iron breeze through being ground into-200 orders, make powder additive, add and stir with breeze before balling-up through feeding machine on blanking port after stoving oven breeze oven dry or the belt, its consumption is 0.1～0.5% production method.

4, according to claim 1 use in the water-soluble polymer one or more with humate, PAM, PEO in one or more synthetic liquid state pellet additives, its consumption is less than 4%, or one or more and CMS, PAM in the use water-soluble polymers, one or more synthetic pellet solid additives among the PEO, its balling-up consumption is less than 0.6%.