CN1160422A - Sintering iron ore blend contg. porous ores - Google Patents
Sintering iron ore blend contg. porous ores Download PDFInfo
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- CN1160422A CN1160422A CN95194392A CN95194392A CN1160422A CN 1160422 A CN1160422 A CN 1160422A CN 95194392 A CN95194392 A CN 95194392A CN 95194392 A CN95194392 A CN 95194392A CN 1160422 A CN1160422 A CN 1160422A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
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Abstract
A process for sintering an iron ore blend of iron ore particles, the iron ore blend comprises soft/porous ores is disclosed. The process comprises forming a green mix of the iron ore blend and a flux; granulating the green mix with water; and sintering the granulated green mix. The process is characterised by a treatment step to inhibit absorption of water into the soft/porous ores.
Description
The present invention relates to the sintering of iron ore compound.
The invention particularly relates to and contain the porous active ore deposit, as the sintering of the iron ore compound of peastone iron ore.
Used " sintering " speech was to describe a technological process when this paper related to the iron ore compound, and the not sinter mixture with powdered solid fuel (as rolled sheet iron, blast furnace dust and small sintering ore) in iron ores particle, flux (as Wingdale, rhombspar and serpentine), fuel and the factory in this process changes into the block that is called " agglomerate ".This technological process comprises following basic step:
(i) at room temperature water will be not sinter mixture make the pelletizing shape, formed pelletizing comprises core or the nuclear that particle is relatively large, and is coating one deck finely powdered viscous material outside this core or nuclear;
(ii) thereby these pelletizing cloth are formed the material bed to a Dwight-Lloyd sintering machine;
(iii) put the surface of fuel bed;
(iv) to the bottom development of material bed, the heat that is produced is enough to the viscous layer surface generation melts at pelletizing from the surface in the burning of the interior fuel of material bed;
(the v) reaction under the high temperature comprises the reaction of the melts of pelletizing and core or nuclear and causes decorating film partly to fuse;
(the vi) cooling of melts and solidifying;
(vii) broken.
In decades, prevailing in international iron ore trade is that the higher-grade from Australia, Brazil and India, fine and close principal constituent are rhombohedral iron ore (Fe always
2O
3) ore (hereinafter referred to as rhombohedral iron ore).
Rhombohedral iron ore is that the banded iron ore-iron content sedimentogeneous rock by the enrichment of geologic time nature forms.This sedimentogeneous rock is made up of the magnetite layer and the quartz layer of thin overlapping.Enrichment process comprises the removal of silica and the adding of iron, thereby has produced big rhombohedral iron ore body, much all has very high grade in these ore bodies.
Hard/employed flux generally includes Wingdale, rhombspar and serpentine during fine and close rhombohedral iron ore compound sintering.According to the common practice, for reaching best productivity of sintering machine, flux particulate size range is chosen in less than 3mm, and wherein the particle less than 1mm occupies suitable ratio.
The Pierre of western australia crust draws the reserves of regional porous active iron ore abundant, and this iron ore is softer and hole is many, porous active iron ore and hard/fine and close also increase day by day of rhombohedral iron ore blended situation than rhombohedral iron ore.
Porous active iron ore (hereinafter referred to as " soft/the porous ore deposit ") comprising: (a) peastone ore deposit, and Yandi ore deposit for example, it is mainly formed is pyrrhosiderite (FeO.OH) and a spot of rhombohedral iron ore; (b) porous rhombohedral iron ore, certain class ore in for example Brazilian Carajas ore deposit; (c) rhombohedral iron ore-pyrrhosiderite, for example Marra Mamba ore deposit.
Be particularly related to Australian iron ore, can in June, 1984/July Ins.Min.Metall the title of the 289th phase of Australas proceeding 152-162 page or leaf publication find soft/porous ore deposit and in classification, adhere to 5,6,7 grades of iron ores separately for " Pierre's crust draw iron ore classification-BIF derive shallow pig iron ore deposit universal classification suggestion " (" Pilbara iron ore classification-aproposal for a common classification for BIF derived supergene iron ore ") literary composition.
Have been found that the subject matter in the soft/porous ore deposit of a large amount of exploitations is that the utilization coefficient of sinter machine is reduced now.People think extensively that also soft/porous ore deposit will cause the sinter machine decrease in yield.
Traditional concept thinks that it is to form the bigger melts of volume because soft/porous ore deposit is easy to react/assimilate that utilization coefficient descends, and finishes above-mentioned iv and v step required time thereby reduced the ventilation property of sintering feed bed high-temperature zone and prolonged greatly.The yield rate reduction is commonly referred to be because of the partial melting thing increases (crossing fusing) and causes reducing by sintering feed bed air flow quantity, thereby makes a small amount of regional area not sintered material occur.
Yet, the applicant's result of study is not supported above-mentioned traditional concept, but support such viewpoint, promptly to reduce be because soft/porous ore deposit has absorbed a large amount of water that is added in pellet forming process to productivity of sintering machine, and that the water that is added is used for iron ores particle is bonding mutually.Particularly the absorbed dose increase of water causes compound bed ventilation property to descend.This research is discussed in following two pieces of papers, i.e. one piece of publication is the 267th～272 page of the 6th international sintering Conference Papers collection in 1993, exercise question is " using coarse particles flux sintering to contain the iron ore compound of Yandi beans limonite " (" Sintering iron ore blendscontaining Yandi pisolitic limonite using coarser fluxes "), another piece publication in the May, 1994～Instn Min Metall proceedings (the Sect C: extra mineral processing that publishes August, metallurgy) the 103rd page, exercise question is " improvement contains the sintering character of the iron ore compound in peastone ore deposit " (" Improvingsintering performance of ore blends containing pisolite ore ").
The shortcoming that reduces with aforesaid productivity of sintering machine is different, has been found that the agglomerate made from soft/porous ore deposit and rhombohedral iron ore compound compares the advantage with reducing property raising and the reduction of pulverize at low temperature index with the agglomerate of only making with the rhombohedral iron ore compound.Reducing property improves porosity raising and the tiny rhombohedral iron ore particulate cause that is considered to because of the agglomerate of soft/porous ore deposit formation.
Existing many about improve sintering soft/porous ore deposit, particularly peastone ore deposit, with the suggestion of the productivity of sintering machine of rhombohedral iron ore compound.
For example the title of Nippon Steel Corp is that the title of the Japanese 58-55221 patent of " sintering deposit preprocessing method of raw materials " (" Method of Pre-processing Sinter Raw Materials ") and in December, 1988 Xin Ri iron company technical report the 59th phase 68～75 pages of publications adheres to one deck serpentine at peastone ore deposit particle surface for the paper of " adopting pre-pelletizing technology to improve productivity of sintering machine " (" Increase of Sinter productivity by Pre-granulationProcess ") proposes in the peastone ore deposit not form with bloodstone and other component before the sinter mixture pelletizing. The purpose of serpentine layer is that the particulate assimilation of peastone ore deposit is changed, and improves the utilization coefficient of sinter machine thus.
In addition, the title of company of Nippon Steel is the Japanese 58-141341 patent suggestion of " contain limonite and be beneficial to the pre-treatment of agglomerating iron ore " (" Preliminary Treating of Ore Containing Limonite for Sintering "), one deck mineral fine (the fine ore granularity more than 80% is less than 0.25mm) was adhered at peastone ore deposit particle surface in the peastone ore deposit before forming not the sinter mixture pelletizing with other component.The purpose of adhering to mineral fine is the particulate assimilation of peastone ore deposit to be changed during the sintering, and improves the utilization coefficient of sinter machine thus.
The title of the 255th～260 page of publication of the 6th international sintering Conference Papers collection in 1993 increases the water yield of adding during the pelletizing for " Kobe steel plant use the operation that is mixed with vast scale peastone ore deposit " (" Operation with high blending ratio of pisolite ore at Kobe Works ") literary composition of the article of " adopting the sintering character of vast scale peastone limonite sintering " (" Plant sintering performance with highproportion of pisolitic limonite ore ") and the 1st international ironmaking science and technology conference collection of thesis in 1994 publication is proposed in/porous ore deposit soft to compensate is to a large amount of absorptions of moisture. Yet this is not a good technology; Makes it contain suff water owing to contain the pyrrhosiderite composition in the peastone ore deposit.The moisture content height of raw material will cause spent air temperture to reduce; Increase the blower fan burden and also might make water condensation and damage the performance of electrostatic precipitator on the blower fan frame in sinter machine.The water yield increase of adding during making ball also can make the front of high-temperature zone in sintering process form the humidity condensing zone of " very wet " .This may to pelletizing in the ventilation property of humidity condensing zone, the humidity condensing zone break and subsequently during sintering sintering feed bed ventilation property and distribute by sintering feed bed air-flow exert an influence.
The purpose of this invention is to provide the technology that a kind of sintering contains the iron ore compound in soft/porous ore deposit, adopt this technology can make sinter machine have higher utilization coefficient, its utilization coefficient is equivalent to or is higher than the utilization coefficient of already known processes that sintering mainly contains the iron ore compound of rhombohedral iron ore.
According to the present invention, the technology of the iron ore compound that a kind of sintering is mixed with iron ore particle is provided, wherein comprise soft/porous ore in the iron ore compound, this technology comprises:
(a) form the not sinter mixture that iron ore and flux are formed;
(b) make ball by in sinter mixture not, adding water;
(c) the not sinter mixture of sintering nodularization,
The feature of this technology is that a treatment step is arranged, and this step will stop water to be absorbed by soft/porous ore deposit.
Realization of the present invention basis is, by stoping water to be absorbed and soft/porous ore deposit might be sneaked in the iron ore compound by soft/porous ore deposit, and can not reduce sintering character (for example available productivity of sintering machine evaluation) and sinter quality (for example estimating with sinter strength).
The treatment step that can select is the performance (as viscosity) that changes the water be used to make ball step (b).
In addition, the treatment step that can select is the performance (as surface property) that changes soft/porous ore deposit.For example, treatment step can have the effect of stopping up soft/porous ore deposit hole.
In addition, the treatment step that can select is the hole in the soft/porous ore deposit of sealing.
Treatment step can be any other appropriate means that stops water to be absorbed by soft/porous ore deposit.
Treatment step preferably includes and adds selected a kind of additive to stop water by soft/porous ore deposit absorption.
Additive can be any suitable material and comprise, but be not limited to starch, natural and synthetic gum, plant sugar and syrup, amylan (for example dextrin), asccharin refinery byproduct or refuse (as molasses), natural glue, gel, synthetic polymer (as polyelectrolyte) and other polymkeric substance (as polyoxyethylene glycol, polyvinyl acetate (PVA), polyvinyl alcohol) and wax.
Additive is one or more sugar, syrup, molasses preferably, or contains the compound of sucrose or Nulomoline.
Additive can adopt any appropriate means and any adding of suitable stage in sintering process.For example, additive can:
(i) dissolve at the water that is used for making ball step (b);
(ii) join in the sinter mixture of step (a) formation with solid state;
(iii) be coated on the iron ore particle in advance before in step (a);
(iv) feed or lack and expect port or ore stacking field, join with solid or liquid form in the sinter mixture of step (a) formation at ore.
Selected additive preferably also can be used as a kind of caking agent with raising make iron ore particle during the ball bounding force and (or) improve pelletizing structural integrity in each different zones (as drying zone and humidity condensing zone) of material bed during sintering.
In this regard, the basis that the present invention is achieved is, if additive also uses as a kind of caking agent, the iron ore compound that sintering character may further improve so, particularly soft for containing/the porous ore deposit (for example all not being the Yandi iron ore of good especially bonding material under room temperature and high temperature).
The iron ore compound preferably includes the soft/porous ore deposit greater than 10% (weight).
The iron ore compound especially preferably includes the soft/porous ore deposit greater than 15% (weight).
The iron ore compound preferably includes the soft/porous ore deposit greater than 20% (weight) especially especially.
Hereinafter the present invention is described further with reference to a series of agglutinating tests that the applicant did and test in place.
Agglutinating test comprises the sintering of various iron ore compounds, to determine whether the glycosyl synthetics can reduce soft/porous ore deposit in the compound to the specific absorption of water, thereby under pilot plant's scale, during making ball, reduce needs, improve and make ball performance, productivity of sintering machine and sinter quality water.
Agglutinating test is to carry out in the breadboard pilot scale sintering pot of the applicant's Newcastle.The area of used sintering pot is 0.09m
2, the height of material bed can reach 500～530mm.Each about 70kg of the used pelletizing gross weight of agglutinating test.The title of being write by C.S.Teo, R.Mikka and C.E.Loo that agglomerating plant and operating parameters see the 1047th～1057 page of publication of ISIJ Int.Vol32 No.10 1992 for details is " distribution of coke granule in agglomeration for iron mine " (" Positioning coke particles in iron ore sin-tering ") literary composition, and this article is quoted as the reference data at this.
Agglutinating test is carried out in the following cases:
(a) adopt the sinter mixture of the benchmark iron ore compound (benchmark compound) that does not contain soft/porous ore deposit as object of reference;
(b) 3 kinds of sinter mixtures (these sinter mixtures are called Yandi No. 1, No. 2 and No. 3 compounds hereinafter) that contain soft in a large number/porous ore deposit.
It is suitable that the benchmark compound contains in benchmark chemical ingredients selected rhombohedral iron ore and the ratio between each component, so that obtain the agglomerate of following target component: 51.46%Fe, 5.07%SiO
2, 1.84%Al
2O
3, 10.13%CaO and 1.55%MgO.The basicity of benchmark compound and 1,2, No. 3 compounds of Yandi all remains on 2.0.
Table 1 illustrates the composition of benchmark compound and 1,2, No. 3 compounds of Yandi.
Table 1 iron ore compound
| Compound | The benchmark compound | ??Yandi ????1 | ??Yandi ????2 | ??Yandi ????3 |
| Mt Newman primary ore | ????50.0 | ????10.0 | ??11.1 | ????18.0 |
| Mt Newman secondary ore | ????16.0 | ????16.0 | ??6.8 | ????7.2 |
| The Yandi ore deposit | ????- | ????40.0 | ??22.2 | ????35.9 |
| The Koolan ore deposit | ????30.0 | ????30.0 | ??- | ????- |
| Whyalla fine ore compound | ????4.0 | ????4.0 | ??15.6 | ????- |
| The Yarie fine ore | ????- | ????- | ??28.6 | ????28.7 |
| The manganese ore powder | ????- | ????- | ??0.9 | ????1.2 |
| Brazil ore deposit | ????- | ????- | ??3.2 | ????- |
| The Tasmanian magnetite | ????- | ????- | ??2.6 | ????- |
| Breeze in other factory | ????- | ????- | ??9.0 | ????9.0 |
| ???? | ???? | ?? | ???? | |
| Sinter basicity | ????2.0 | ????2.0 | ??2.0 | ????2.0 |
| Agglomerate MgO content | ????1.55 | ????1.55 | ??1.5 | ????1.5 |
| Rhombspar: serpentine (weight ratio) | ????0.66： ????0.34 | ????0.66： ????0.34 | ??0.64： ??0.36 | ????0.64： ????0.36 |
In a word, the purpose of agglutinating test is that returning mine of obtaining is stabilized between 0.95～1.05.
In each agglutinating test, be used to make the about altogether 100kg of sinter mixture that forms by iron ore and flux of ball, make ball and be in diameter is the batch type drum pelletizer of 1.1m and carry out.
The additive that pellet forming process comprises has:
(a) water is as reference; Or
(b) 5% (weight) sugar soln; Or
(c) 10% (weight) sugar soln; Or
(d) 10% (weight) molasses.
In each test, when compound joins in the pelletizer, make ball and spray on benchmark compound and each Yandi compound with the mode of liquid with spray.Making ball after 10 minutes, pelletizer is being tilted, and making pelletizing is directly being poured in the funnel.
The standard method of adding compound in sintering pot is included in the sintering pot top and places a funnel, and the sliding shutter of opening funnel bottom will be expected the bed strickling with scraper plate then to the sintering pot discharging.Sintering condition is shown in table 2.
Table 2 agglutinating test condition
| Ignition temperature | ????1200℃ |
| The igniting negative pressure | ????6KPa |
| Ignition time | ????1.5min |
| The sintering negative pressure | ????16KPa |
| Cooling | Under 16KPa pressure, ventilate downwards |
| The stabilization fragmentation | Be broken into 4 at the 2m place |
| Agglomerate | ????+6.4mm |
Unique difference between No. 1 compound composition of benchmark compound and Yandi is the Yandi ore deposit that No. 1 compound of Yandi contains 40% (weight) as can be seen from Table 1, the Mt Newman primary ore that has only 10% (weight), and the benchmark compound contains the Mt Newman primary ore of 50% (weight) and do not have the Yandi ore deposit or other soft/porous ore deposit.Therefore, benchmark compound and No. 1 compound agglutinating test of Yandi result's relatively provides good evaluation basis of the present invention.In addition, the composition of No. 2, Yandi and No. 3 compounds of Yandi is different from No. 1 compound of Yandi fully, and the agglutinating test result of these compounds for estimate sugar soft to containing/influence of the iron ore compound in porous ore deposit provides good basis.
Under these conditions, the agglutinating test of benchmark compound and No. 1 compound of Yandi the results are shown in table 3, and the agglutinating test of No. 2 and No. 3 compounds of Yandi the results are shown in table 4.
The agglutinating test result of table 3 benchmark compound and Yandi1 compound (Yandi ore deposit humidity is 6%).Wherein, first letter: B represents the benchmark compound, promptly non-Yandi compound; Numeral 1 expression Yandi1 compound promptly uses 40%Yandi ore deposit (peastone ore deposit) to replace the benchmark compound.
Character in bracket: 10S represents 10% sugar soln or equivalent identical in quality; 5S represents 5% sugar soln or equivalent identical in quality; W represents water; 10M represents 10% molasses solution.
Last letter: G represents water is added in the pelletizer; D represents to add dry ore; S represent the Yandi ore deposit be immersed in the solution before mix in other ore deposit and when making ball, make water; C represents that the Yandi ore deposit overlayed on its outside with thin solid-state steamed bun stuffed with sugar before making ball.
The agglutinating test result of No. 2, table 4 Yandi and No. 3 compounds (Yandi ore deposit humidity is 6.0%).Wherein, first character: 2 expression Yandi No. 2 compounds (in the ore compound, have an appointment 25% Yandi ore deposit); 3 expression Yandi No. 3 compounds (in the ore compound, have an appointment 40% Yandi ore deposit); Above-mentioned # represents the Yandi sample of being dried.
Character in the bracket: 10S represents 10% sugar soln or equivalent identical in quality; 5S represents 5% sugared liquation; W represents water.
Last letter: G represents water is added in the pelletizer.
Table 3
| Compound | Sinter mixture humidity (%) | Quantity of return mines in the sinter mixture (%) | Sintering time (min) | Utilization coefficient (t/m 2d) | Coke ratio (Kg/t) | Tumbler index (%6.3mm) | The balance of returning mine |
| ??B(W) ??1(W) ??B(10S)-G ??1(10S)-G ??1(10S)-G ??1(10S)-G ??1(10S)-D ??1(10S)-S ??1(10S)-C ??1(5S)-G ??1(10M)-G | ??5.53 ??5.54 ??5.52 ??5.49 ??5.31 ??5.14 ??5.69 ??5.47 ??5.80 ??5.67 ??5.71 | ??50 ??55 ??60 ??55 ??55 ??55 ??47.5 ??47.5 ??47.5 ??50 ??47.5 | ??18.1 ??19.6 ??16.9 ??14.9 ??16.1 ??17.5 ??18.2 ??17.4 ??17.2 ??17.5 ??18.4 | ??43.5 ??38.0 ??46.8 ??51.0 ??48.3 ??43.6 ??43.6 ??45.8 ??46.2 ??44.7 ??43.0 | ??66.0 ??67.6 ??65.9 ??67.0 ??66.6 ??67.5 ??64.9 ??67.2 ??59.1 ??67.1 ??68.9 | ??63.2 ??66.2 ??64.4 ??66.6 ??67.5 ??68.6 ??67.9 ??68.6 ??69.2 ??67.0 ??67.6 | ??0.97 ??0.95 ??0.92 ??0.96 ??0.91 ??0.95 ??0.96 ??0.95 ??0.96 ??0.94 ??0.97 |
Table 4
| Compound | Sinter mixture humidity (%) | Quantity of return mines in the sinter mixture (%) | Sintering time (min) | Utilization coefficient (t/m 2.d) | Coke ratio (Kg/t) | Tumbler index (%-6.3mm) | The balance of returning mine |
| ??2(W) | ????6.01 | ????50 | ????17.2 | ????43.2 | ????65.3 | ????61.5 | ????1.03 |
| ??2(10S)-G | ????5.99 | ????50 | ????14.7 | ????52.8 | ????64.0 | ????61.9 | ????0.98 |
| ??2(10S)-G | ????5.60 | ????50 | ????16.3 | ????47.6 | ????63.5 | ????63.1 | ????0.97 |
| ??2 #(10S)-G | ????5.68 | ????50 | ????15.4 | ????51.0 | ????64.0 | ????61.1 | ????0.97 |
| ??3(W) | ????5.96 | ????50 | ????19.7 | ????38.0 | ????69.0 | ????63.8 | ????0.98 |
| ??3(10S)-G | ????5.89 | ????50 | ????14.6 | ????50.0 | ????64.1 | ????61.6 | ????0.99 |
Table 3 illustrates sinter mixture humidity and is about 5.5% and add sugar, with Yandi ore deposit replacement Mt Newman primary ore result productivity of sintering machine is significantly reduced in the Yandi1 compound, reduces to 38 tons every square metre every day from 44 tons every square metre every day.
Table 3 also illustrates and uses 10% sugar soln to replace to make the ball water that the sintering of the compound that contains the Yandi ore deposit is had the influence that is highly profitable.Be similarly in sinter mixture humidity under 5.5% the situation, use sugar soln to replace water and make ball, can shorten sintering time greatly and utilization coefficient can be brought up to about 50 tons every square metre every day from 38 tons every square metre every day.This table also illustrates and sugar soln is used for the benchmark compound some positively effects are also arranged, but the sintering character increase rate is little, only brings up to 47 tons every square metre every day from 43 tons every square metre every day.
Table 3 also illustrates and uses sugar soln for other benefit of Yandi compound agglomerating.Even please note under the situation of utilization coefficient up to about 51 tons of every square metre of every days, still the sinter strength with the Yandi compound that only uses 5.5% humidity is suitable for the sinter strength of producing with the Yandi compound (representing with tumbler index), and its intensity is higher than the sinter strength of benchmark compound, this shows that the sintering coke ratio will descend under the same sinter strength situation of acquisition.
Table 3 also demonstrates, if do not need very high utilization coefficient, it is about 5.1% that the temperature of sinter mixture can be reduced to, and can save a large amount of coke, this is because the intensity of agglomerate is much higher than base case (the ISO tumbler index is about 69, and base case is 63).
It can also be seen that from table 3, add 5% sugar soln in No. 1 compound of Yandi, the utilization coefficient of sinter machine is suitable with use benchmark compound, and meanwhile the intensity of the agglomerate of Sheng Chaning but improves.
It can also be seen that from table 3 sugar can adopt other method to add rather than dissolve in and make in the ball water.For example, this table also illustrates, and sugar is added on the ore also helpful to productivity of sintering machine with drying regime, though effect is obvious not as sugar is dissolved in the liquid income effect before use.Yandi ore deposit particle also has very big influence with sugar prefabricated pelletizing of grain or coating to utilization coefficient.The raising of utilization coefficient also is accompanied by increasing substantially of sinter strength.Last a kind of method of being considered is some Yandi ore deposits (greater than the fragment of 1mm) to be immersed in before use contain in 10% sugar soln.What after this use in making the ball process is ordinary tap water.The result shows that productivity of sintering machine increases substantially and sinter strength improves greatly.
Table 3 shows that also molasses (syrup residue) also is useful.Therefore test afterwards (this paper does not provide) shows for improving sintering character, needs with more molasses owing to sugared content in the molasses is lower.In addition, have been found that Nulomoline also has the effect of minimizing Yandi ore deposit to moisture absorption and raising utilization coefficient.
Table 4 illustrates the utilization coefficient that sugar can improve No. 2 and No. 3 compounds of Yandi greatly.
Also tested some other additive,, thereby stoped water to be absorbed by soft/porous ore deposit with the performance (for example viscosity) of change water.Some materials, all influential as starch, polymkeric substance (for example polyacrylamide), dextrin and natural gum (under proper content) to sintering process, but influence degree is different.Most of materials have positive influence (promptly in sinter mixture humidity, utilization coefficient is greater than 38 tons every square metre every day) at about 5.5% o'clock to utilization coefficient really, but are different from the influence degree of the sugar of same amount.Almost in all cases, these additives are introduced sintering process all can under same humidity condition, produce the much higher agglomerate of intensity, because energy is not used to remove the moisture of interpolation.Test-results shows that also coke ratio also can reduce significantly and conference makes sinter strength be brought down below about 64 benchmark numerical value.
After above-mentioned agglutinating test was finished, the applicant had carried out a series of test in place again on the sinter machine of the slab of the NSW at place Port Kembla company and Heavy Plate Production department.
The employed sinter mixture of test in place contains the Port Hedland breeze of 36.06% (weight), and this breeze contains the Yandi ore deposit of 65% (weight), the Mt Newman breeze of 35% (weight).Therefore, about 24% (weight) of Yandi mineral content in sinter mixture.The component of sinter mixture is shown in table 5.
Table 5
| The mixer feeding | Combined amount |
| Port Hedland fine ore Yarrie P fine ore Whyalla fine ore M.B.R. Mt Newman secondary ore powder sintering returns ore deposit U/S Carol Lake Tasmania magnetite ASMS sintering and returns the secondary breeze flue dust of ore deposit MBR, the converter metal charge, filter cake, dedusting mud, rolled sheet iron, the secondary breeze powdered iron ore of Endcone Yarrie compound calcined dolomite | ????36.06 ????19.07 ????14.64 ????7.98 ????5.00 ????2.75 ????2.40 ????2.09 ????1.07 ????1.04 ????5.40 ????1.00 ????0.93 ????0.58 |
| Compound amounts to | ????100.00 |
The part of sinter mixture (" test sinter mixture ") prepares with sugar soln, remaining sinter mixture (" benchmark sinter mixture ") sugar additives preparation of no use.The details of the operation of the performance of sintered material material bed, sinter machine and sinter quality is not shown in table 6, table 7 and table 8 respectively.
Table 6 is the performance of sintered material material bed not
| Unit | Testpieces | The benchmark material | Difference | |
| Sintered material material bed not | ||||
| Ventilation property | The ventilative unit of Japan | ????37.0 | ????33.9 | ????+3.1 |
| Sinter mixture humidity | ????％ | ????5.73 | ????5.47 | ????-0.26 |
| Green pellets | ||||
| Mean sizes | ????mm | ????3.01 | ????2.93 | ????+0.08 |
| The harmonic mean size | ????mm | ????0.98 | ????0.86 | ????+0.12 |
Table 7 sinter machine operation index
| Unit | Testpieces | The benchmark material | Difference | |
| Utilization coefficient | ??t/d.m2 | ????35.4 | ????32.2 | ????+3.2(+10％) |
| Coke ratio | ??kg/t-s | ????51.3 | ????50.3 | ????+1.0 |
| The coal gas ratio | ??Nm3/t-s | ????1.53 | ????1.65 | ????-0.12 |
| Return mine | The feeding of % machine | ????20.4 | ????18.7 | ????1.7 |
| The cloth height | ????mm | ????545 | ????539 | ????+6 |
| Crest of flame speed | ??mm/min | ????24.2 | ????22 | ????+2.2 |
| Sinter mixture humidity | ????％ | ????5.8 | ????5.9 | ????-0.1 |
Table 8 sinter quality
| Unit | Testpieces | The benchmark material | Difference | |
| Mean sizes | ????mm | ????16.2 | ????16.8 | ????-0.6 |
| ??+5mm | ????％ | ????93.7 | ????94.2 | ????-0.5 |
| Tumbler index | ????％+10mm | ????64.5 | ????65.4 | ????-0.9 |
| Reduction and pulverization ratio | ????％-3mm | ????36.8 | ????39.1 | ????-2.3 |
| Reduction ratio | The % reduction | ????63.7 | ????63.9 | ????-0.2 |
With reference to table 6, table 7 and table 8, the sintering test in place draws an interesting result, and Here it is, and test is higher by 3.1% than benchmark sinter mixture with the ventilation property of sinter mixture material bed not, and their humidity requirement differs very little.This explanation sugar is to making the useful influence of ball.
Another interesting result of sintering test in place is that the test sinter mixture can make productivity of sintering machine (table 7) improve 10%, and the quality of agglomerate and benchmark sintered material suitable (table 8).
With regard to quantitatively, the result of sintering test in place is also not as good like that in the agglutinating test result.This is because special apparatus factor, and the applicant believes under normal appointed condition, will obtain better result on sinter machine.
In a word, the sintering test in place has further confirmed the useful result of agglutinating test.
Under the situation that does not deviate from the spirit and scope of the present invention, can carry out various improvement to the present invention described above.
Claims (15)
1, the technology of the iron ore compound formed by iron ore particle of a kind of sintering, wherein the iron ore compound contains soft/porous ore deposit, and this technology comprises:
(a) form the not sinter mixture of forming by iron ore compound and flux;
(b) make ball by in sinter mixture not, adding water;
(c) the not sinter mixture of sintering nodularization,
The feature of this technology is that a treatment step is arranged, and this step will stop water to be absorbed by soft/porous ore deposit.
2, technology according to claim 1, wherein treatment step comprises the performance that changes the water be used to make ball step (b), as viscosity.
3, technology according to claim 1 and 2, wherein treatment step comprises the soft/porous ore deposit performance of change, as surface property.
4, any one in requiring according to aforesaid right requires described technology, and wherein treatment step comprises the hole that seals soft/porous ore deposit.
5, any one in requiring according to aforesaid right requires described technology, and wherein treatment step comprises that adding selected a kind of additive is absorbed by soft/porous ore deposit to stop water.
6, any one in requiring according to aforesaid right requires described technology, and wherein treatment step comprises that adding selected a kind of additive is absorbed by soft/porous ore deposit to stop water, and plays the effect of caking agent during making ball and/or during sintering.
7, according to claim 5 or 6 described technologies, wherein additive comprises one or more starch, natural and synthetic gum, plant sugar and syrup, amylan, for example dextrin, asccharin refinery byproduct or refuse, as molasses, natural glue, gel, synthetic polymer, as polyelectrolyte and other polymkeric substance, as polyoxyethylene glycol, polyvinyl acetate (PVA), polyvinyl alcohol and wax.
8, require described technology according in the claim 4 to 7 any one, wherein additive comprises one or more sugar, syrup, molasses, or contains the compound of sucrose or Nulomoline.
9, require described technology according in the claim 4 to 8 any one, wherein treatment step comprises additive is dissolved in during making ball step (b) in the employed water.
10, require described technology according in the claim 4 to 8 any one, wherein treatment step comprises additive is added to when step (a) in the formed sinter mixture with solid form.
11, require described technology according in the claim 4 to 8 any one, wherein treatment step is included in and adopts step (a) before iron ores particle to be coated in advance with additive.
12, require described technology according in the claim 4 to 8 any one, wherein treatment step is included in ore charging and discharging port or ore and stacks the field additive is added in the formed sinter mixture of step (a) with solid or liquid.
13, any one in requiring according to aforesaid right requires described technology, and wherein the iron ore compound comprises the soft/porous ore deposit greater than 10% weight.
14, according to the technology described in the claim 13, wherein the iron ore compound comprises the soft/porous ore deposit greater than 15% weight.
15, according to the technology described in the claim 14, wherein the iron ore compound comprises the soft/porous ore deposit greater than 20% weight.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPM6654A AUPM665494A0 (en) | 1994-07-06 | 1994-07-06 | Mineral processing |
| AUPM6654 | 1994-07-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1160422A true CN1160422A (en) | 1997-09-24 |
| CN1044724C CN1044724C (en) | 1999-08-18 |
Family
ID=3781222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95194392A Expired - Fee Related CN1044724C (en) | 1994-07-06 | 1995-07-06 | Sintering iron ore blend contg. porous ores |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0769074A1 (en) |
| JP (1) | JPH10502417A (en) |
| KR (1) | KR970704896A (en) |
| CN (1) | CN1044724C (en) |
| AU (2) | AUPM665494A0 (en) |
| TW (1) | TW291497B (en) |
| WO (1) | WO1996001333A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105950861A (en) * | 2016-07-15 | 2016-09-21 | 东北大学 | Preparation method for magnesium smelting dolomite prefabricated pellets |
| CN107782596A (en) * | 2017-10-24 | 2018-03-09 | 武汉钢铁有限公司 | The making of Cavitated sample and method of testing after more than 5mm iron ore sinterings |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020035188A1 (en) * | 2000-07-21 | 2002-03-21 | Steeghs Henricus Renier Gerardus | Agglomerating particulate materials |
| EP1367141A4 (en) * | 2001-02-22 | 2007-08-22 | Nippon Steel Corp | Method of granulation treatment of raw material for iron making and granulation treatment agent for iron making |
| AUPR678301A0 (en) * | 2001-08-02 | 2001-08-23 | Commonwealth Scientific And Industrial Research Organisation | Iron ore briquetting |
| EP1942201A1 (en) * | 2007-01-04 | 2008-07-09 | China Steel Corporation | Ore sintering composition and ore sintering method |
| KR101253895B1 (en) * | 2010-12-28 | 2013-04-16 | 주식회사 포스코 | Method of treating surface of finex hot compact iron |
| JP6540359B2 (en) * | 2014-11-21 | 2019-07-10 | 日本製鉄株式会社 | Modified carbon material for producing sintered ore and method for producing sintered ore using the same |
| JP6562226B2 (en) * | 2016-12-27 | 2019-08-21 | Ｊｆｅスチール株式会社 | Method for estimating proper granulated water content during production of sintered raw material and method for producing sintered raw material |
| TWI824943B (en) * | 2022-12-20 | 2023-12-01 | 美商世界資源公司 | Method of reducing carbon emissions and improving the environmental performance of concentrate producers and smelters |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5814492B2 (en) * | 1975-12-27 | 1983-03-19 | 新日本製鐵株式会社 | shouketsukounoseizouhouhou |
| JPS5672135A (en) * | 1979-11-14 | 1981-06-16 | Sumitomo Metal Ind Ltd | Adjusting method of blended water in sintering raw material |
| JPS6144135A (en) * | 1984-08-09 | 1986-03-03 | Nippon Kokan Kk <Nkk> | Method for regulating amount of water added to starting material for sintering |
| JPS6148536A (en) * | 1984-08-11 | 1986-03-10 | Nisshin Steel Co Ltd | Manufacture of sintered ore |
| KR960010579B1 (en) * | 1992-02-13 | 1996-08-06 | 신니뽄세이데스 가부시끼가이샤 | Iron-making sintered ore produced from pisolitic iron ore and the production thereof |
| JPH05339652A (en) * | 1992-06-09 | 1993-12-21 | Nippon Steel Corp | Preliminary pelletization method for production of sintered ore made by using pisolite ore as main raw material and its pseudo particle structure |
-
1994
- 1994-07-06 AU AUPM6654A patent/AUPM665494A0/en not_active Abandoned
-
1995
- 1995-07-05 TW TW084106954A patent/TW291497B/zh active
- 1995-07-06 KR KR1019970700032A patent/KR970704896A/en not_active Application Discontinuation
- 1995-07-06 AU AU28751/95A patent/AU2875195A/en not_active Abandoned
- 1995-07-06 CN CN95194392A patent/CN1044724C/en not_active Expired - Fee Related
- 1995-07-06 EP EP95924108A patent/EP0769074A1/en not_active Withdrawn
- 1995-07-06 WO PCT/AU1995/000408 patent/WO1996001333A1/en not_active Application Discontinuation
- 1995-07-06 JP JP8503580A patent/JPH10502417A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105950861A (en) * | 2016-07-15 | 2016-09-21 | 东北大学 | Preparation method for magnesium smelting dolomite prefabricated pellets |
| CN107782596A (en) * | 2017-10-24 | 2018-03-09 | 武汉钢铁有限公司 | The making of Cavitated sample and method of testing after more than 5mm iron ore sinterings |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2875195A (en) | 1996-01-25 |
| CN1044724C (en) | 1999-08-18 |
| KR970704896A (en) | 1997-09-06 |
| WO1996001333A1 (en) | 1996-01-18 |
| EP0769074A4 (en) | 1997-05-21 |
| JPH10502417A (en) | 1998-03-03 |
| TW291497B (en) | 1996-11-21 |
| AUPM665494A0 (en) | 1994-07-28 |
| EP0769074A1 (en) | 1997-04-23 |
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