AU2008100427A4 - Efficient separation method for low grade complex iron ore - Google Patents
Efficient separation method for low grade complex iron ore Download PDFInfo
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- AU2008100427A4 AU2008100427A4 AU2008100427A AU2008100427A AU2008100427A4 AU 2008100427 A4 AU2008100427 A4 AU 2008100427A4 AU 2008100427 A AU2008100427 A AU 2008100427A AU 2008100427 A AU2008100427 A AU 2008100427A AU 2008100427 A4 AU2008100427 A4 AU 2008100427A4
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Description
00 EFFICIENT SEPARATION METHOD FOR LOW GRADE COMPLEX IRON ORE FIELD OF THE INVENTION [0001] The present inventions relates to the fields of ferrous metallurgy, and particularly, to a separation method for separating complex iron ores such as low grade limonite, low grade micro size hematite, siderite or its mixed ores, or iron ore tailings containing low grade micro-disseminated iron, and high content of harmful elements.
00 BACKGROUND OF THE INVENTION [0002] In recent years, shortage supply of iron ores in the world is resulting in a substantial growth of the iron ore price. Therefore, it has promising market and application prospects to utilize effectively home and abroad low grade and microdisseminated hematite, limonite, or siderite sources; or to recover the iron contained minerals from the iron ore tailings to produce high grade iron ore concentrate or to reduce iron directly so as to get raw materials for blast furnace or electric furnace steelmaking process.
[0003] Though there is a plenty of limonite (goethite) resources world-widely, they are difficult to be separated and concentrated. For example, there are plenty of limonite resources in Australia, only high grade limonite powder or lump is utilized directly (the grade of iron is limonite containing iron grade lower than 56% is discarded as waste rock. In the production process for high grade ores, the ores are washed and deslimed in order to decrease the A1 2 0 3 content, the sludge is also discarded directly though it contains high iron. China also has vast limonite and siderite resources, but the grade of iron is low and the content of harmful elements is high. Many separation processes, such as floatation separation, gravity separation, magnetic separation, and their combined separation, are developed, but they are seldom applied in real production owing to the poor separation effect and high separation cost. The limonite ore is a kind of hematite (or called goethite) containing crystalline water, and thus has a complicated ore structure. The limonite is easy to be slimed during grinding and separation, the ore 00
O
,1 washability is poor, the economic and technical indices are unfavorable, and moreover, the separated product is still limonite, and thus the crystalline water, Si, and Al contents in the acid gangue are high, thermal explosion is easy to occur during pellet-grouping burning, so that the production quantity and quality of the sintered ore and pellet ore are influenced badly, which is not good to strengthen blast furnace process. Siderite is a mineral containing carbonates, thus has a similar performance with carbonate minerals Ssuch as gangue calcite, and therefore is difficult to be concentrated with conventional separation method. Besides, the conventional ore separation technology is also not 00 suitable for separating effectively the plenty of micro-disseminated, low iron grade raw hematite ores. Therefore, in accordance with the plenty of complex and low grade limonite, hematite, siderite and their mixed ores, or iron ore tailings that are difficult to be separated, it is of great significance to develop new separation process so as to increase separation efficiency, and thereby, to produce high quality iron ore concentrate or to reduce iron directly.
SUMMARY OF THE INVENTION [0004] Therefore, in accordance with the low grade limonite, low grade micro size hematite, siderite or their mixed ores, or iron ore tailings containing micro-disseminated distributed low grade iron and high content of harmful elements resulting in difficulty to be separated, the objective of the present invention is to develop a new separation method to make the best of inferior iron ore resources and inferior coals to produce high quality iron ore concentrate or to reduce iron directly, and thereby to expand raw material source for producing pellets and to strengthen blast furnace process or electric furnace process.
[0005] To achieve the objective of the present invention, there is provided an efficient separation method for low grade and complex iron ores. Sort processing first the complex iron ores according to grade and class; drying and preheating the pellets produced with the obtained ore lump or powder; then processing with subsequent steps of reducing roasting, cooling, ball grinding, magnetic separation or reverse flotation separation to obtain iron ore concentrate or reduced iron powder. In certain embodiments of the present invention, said sort processing means that, crushing and screening the iron ore with an iron grade of 50-56% into ore lump and fine grained ore powder; drying and preheating 00 CK1 the ore lump directly, while separating the fine grained ore powder through the processes of grinding, washing, and desliming to obtain iron ore concentrate with an iron grade of 58-60% and ore sludge; dehydrating and drying the ore sludge obtained after the processes of ore washing, desliming, and separation and then blending for producing pellets with the addition of additives. In certain embodiments of the present invention, said sort processing means that, crushing and screening the iron ore with an iron grade of 40-50% into ore lump and fine grained ore powder; drying and preheating the ore lump Sdirectly, while dry grinding the fine grained ore powder into fine iron ore powder first 00 and then blending to produce pellet with the addition of additives. In certain Sembodiments of the present invention, said sort processing means that, crushing and screening the iron ore with an iron grade of 25-40% into ore lump and fine grained ore powder; drying and preheating the ore lump directly, while processing the fine ore powder with the steps of grinding, gravity separation or high gradient magnetic separation, and reverse flotation separation to produce coarse iron ore concentrate; blending the coarse ore concentrate to produce pellets with the addition of additives.
[0006] In certain embodiments of the present invention, wherein said additive for the blending process is complex additive, comprising humic acids and bituminous coal with a mass ratio of 0.5-3:1-4.
[0007] In certain embodiments of the present invention, wherein said ore lump has grain size larger than 15mm, while said fine grained ore powder has grain size smaller than [0008] In certain embodiments of the present invention, processes of drying and preheating and reducing roasting are performed by using grate-rotary kiln or grate-shaft kiln, the pellet ore is preheated on the grate by the hot waste gas from the kiln end outlet in order to remove the crystalline water.
[0009] In certain embodiments of the present invention, the iron ore with an iron grade of 50-56% is crushed and screened into ore lump and fine grained ore powder, wherein the ore lump with grain size of 15-30mm is added directly into the grate for drying and preheating and then is transported into the rotary kiln for reducing roasting.
00 CK1 [0010] In certain embodiments of the present invention, the iron ore with an iron grade of 50-56% is crushed and screened into ore lump and fine grained ore powder, wherein the fine grained ore powder with grain size less than 15mm is preferably grinded, washed by screw washer, deslimed by grinding cyclone, and separated by spiral chute to obtain iron ore concentrate with an iron grade of 58-60%. The ore sludge with grain size less than 0.074 mm obtained after the processes of ore washing, desliming, and separating is dehydrated and dried first and then is processed with subsequent steps of pellet producing, Sdrying, and preheating.
00 [0011] In certain embodiments of the present invention, the iron ore with an iron grade of 50-60% is crushed and screened into ore lump and fine grained ore powder, wherein particularly, the ore grains with preferable grain size of 15-20mm is grinded first, and then optionally, is gravity separated by spiral chute to get coarse iron ore concentrate 1 and ore tailing 2; the coarse ore concentrate 1 is second grinded and then is gravity separated by spiral chute to get coarse ore concentrate 2 and ore tailing 2; the ore tailing 1 and ore tailing 2 are combined and then are high gradient magnetic separated to get coarse ore concentrate 3 and ore tailing 3; the coarse ore concentrate 2 is grinded first and is combined with the coarse ore concentrate 3, and then is reverse flotation separated to get iron ore concentrate and ore tailing 3; the two ore tailings 3 are combined and then are processed with subsequent steps of drying and preheating, and reducing roasting.
[0012] In certain embodiments of the present invention, wherein the grain size of the ore sludge obtained after the processing of the iron ore with an iron grade of 50-56% is less than 0.074mm.
[0013] In certain embodiments of the present invention, the ore lump with grain size of 15-30mm obtained from the crushing of the iron ore with an iron grade of 40-50% is transported into the grate directly for drying and preheating, and into the rotary kiln for reducing roasting.
[0014] In certain embodiments of the present invention, during the crushing and screening of the iron ore with an iron grade of 40-50%, the reducing roasting is performed with grate-shaft furnace, wherein the hot source of the grate is from the waste 00 CK1 gas from the kiln end outlet, the preheated pellets or ore is transported into the shaft furnace directly or is added into the shaft furnace by bucket elevator.
[0015] In certain embodiments of the present invention, the combustion chamber is used O for heating the shaft furnace, the temperature of the combustion chamber is controlled in the range of 900-1000°C, the air excess rate is controlled in the range of 0.8-1.0 in order r, to supply weakly reducing atmosphere.
[0016] In certain embodiments of the present invention, the iron ore with an iron grade of 00 25-40% is crushed and screened into ore lump and fine grained ore powder, wherein the ore lump with preferable grain size of 15-20mm is dried and preheated directly.
[0017] In certain embodiments of the present invention, the iron ore with an iron grade of 25-40% is crushed and screened into ore lump and fine grained ore powder, wherein the fine grained ore powder with grain size less than 15mm is grinded; optionally, the ore powder with grain size less than 15mm in the raw iron ore or ore tailings can be grinded directly.
[0018] In certain embodiments of the present invention, the reduced iron powders is briquetting pressed and dried with the addition of complex agent, wherein said complex agent contains 70-90% tung oil and 30-10% quicklime in mass ratio.
[0019] In accordance with the present invention, since the low grade complex micro size hematite and ore tailings containing low iron content and high harmful impurities such as silicon, sulfur, phosphor, and so on, the disseminated grain size of the gangue minerals containing silicon and aluminum is small, resulting in easy sliming during fine grinding.
The low grade limonite ore contains high crystalline water and high content of silicon and aluminum, and the disseminated grain size of the iron ore and the gangue minerals containing silicon and aluminum is small, the iron ore and the gangue minerals containing silicon and aluminum are closely associated and have similar density. The concentration effect by using the conventional physical ore dressing and chemical ore dressing is poor, and thus the produced iron ore concentrate contains low iron and high silicon and aluminum. Particularly, the iron ore concentrate produced by limonite ore still contains high crystalline water, and thus is not suitable for producing pellets. The proportion of iron ore concentrate in the sintered material is low, restricting severely the 00 development of limonite ore dressing technology. Moreover, the quality of the product is poor and the cost is high. In accordance with the present invention, the iron ores are first sort processed according to their class and iron grade. For low grade raw iron ore and ore tailings, generally they are pre-dressed to increase the iron grade so as to reduce the processing capacity for subsequent reducing roasting, and thereby, to decrease production cost. The obtained coarse ore concentrate is then processed though reducing roasting so as to convert the weakly magnetic ferric iron oxides of hematite and goethite in the Slimonite ore into strongly magnetic magnetite or metal iron, at the same time, the 00 crystalline water is also removed. The minerals containing silicon and aluminum in the Siron ore concentrate are then further removed by applying fine grinding-weak magnetic separation or reverse flotation process so as to produce high quality magnetic iron ore concentrate containing high iron, low silicon and low aluminum finally. The grain size of the iron ore concentrate is pretty suitable for producing high quality pellets without any pre-processing such as fine grinding or rolling. The iron ore concentrate is also applicable to produce reduced iron powder directly, which can be used as electric furnace material after briquetting pressed. For limonite or hematite ore containing relatively high iron and low impurities, combined ore dressing processes can be used for producing iron ore powder suitable for sintering.
[0020] The process flow of the present invention is described in Figs. 1-4.
[0021] Fig. 1 illustrates a combined ore dressing process flow of the present invention, processing the raw iron ore containing iron grade of 50-56% through the steps of crushing, screening, grinding, and washing; then transporting the obtained ore lump with grain size of 5-30mm into the grate-rotary kiln directly for drying, preheating, and reducing roasting so as to produce magnetic iron ore concentrate or reduced iron powder.
Fine grinding the ore portion having a middle grain size of 5-0.074mm to fineness degree of -0.074mm first and then processing with steps of cyclone desliming, cyclone desilting, and spiral chute separating to produce directly sintered powder containing an iron grade of 58-60%. Combining the ore sludge with fineness degree of -0.074mm from all the processes to produce magnetic iron ore concentrate or reduced iron powder through the processes of drying, pellet making, drying preheating, reducing roasting, cooling in water, ball grinding, and magnetic separation or reverse flotation.
00 [0022] As shown in Fig. 2, processing the iron ore with an iron grade of 50-56% with the steps of crushing, screening, and grinding; gravity separating the ore lump with grain size of 15-20mm by utilizing spiral chute to get coarse ore concentrate 1 and ore tailing 1; grinding first the coarse ore concentrate 1 for gravity separating with spiral chute to get coarse ore concentrate 2 and ore tailing 2; combining the ore tailing 1 and ore tailing 2 for high gradient magnetic separation to get coarse ore concentrate 3 and ore tailing 3; grinding the coarse ore concentrate 2 and then combining with the coarse ore concentrate S3 for reverse flotation separating to get iron ore concentrate and ore tailing 3. Combining 00 the two ore tailings 3 for making pellet; processing the raw pellet with subsequent Sprocesses of drying preheating, reducing roasting, cooling in water, ball grinding, magnetic separation, ball grinding, and reverse flotation separation until the magnetic iron ore concentrate or reduced iron powder is produced.
[0023] As shown in Fig. 3, crushing and screening the iron ore with an iron grade of into ore lump and ore powder. Fine grinding first and then blending the ore powder with the addition of complex additives to produce pellet with disc pelletizer. Drying, concreting, and preheating the raw pellet in the grate, and then reducing roasting it in the rotary kiln. Cooling the roasted product directly in water, and then grinding and magnetic separating the cooled roasted product to get magnetic ore concentrate or reduced iron powder. Wet ball grinding the magnetic ore concentrate and removing the minerals containing silicon and aluminum by utilizing magnetic column and barrel weak magnetic separator. Reverse flotation separating the ore with high aluminum content after magnetic separation to remove aluminum further so as to get final magnetic iron ore concentrate containing high iron, low silicon, and low aluminum. Therefore, the specific process steps are: producing complex pellet reducing roasting in grate/rotary kiln cooling in water ball grinding coarse separating in barrel weak magnetic separator ball grinding magnetic column reverse flotation fine separating.
[0024] In certain embodiments of the present invention, crushing the ore lump to have grain size of 5-30mm, and then transporting them into the grate for drying and preheating, and then into the rotary kiln for reducing roasting. The subsequent processes are the same as described above. Fine grinding the ore lump with fineness degree of -5mm and then processing with the steps of pellet making, reducing roasting, and magnetic separating.
00 r1 [0025] In certain embodiments of the present invention, the parameters of the various process steps are optimized, including the proportion of complex additive, preheating time, preheating temperature, reducing roasting time, combustion material addition ratio, ore grinding time and grain size, magnetic intensity of magnetic column, and magnetic separation time, etc.
[0026] In certain embodiments of the present invention, the process of reducing roasting can also be conducted by applying grate shaft furnace. The heat source of the grate is from the waste gas from the kiln end outlet, the preheated pellet or ore can be transported 00 into the shaft furnace directly or through bucket elevator. The combustion chamber is applied for heating the shaft furnace, wherein coal, coal gas or natural gas can be used as heating material. The temperature of the combustion chamber is controlled in the range of 900-1000°C, the air excess rate is controlled in the range of 0.8-1.0 to supply weak reducing atmosphere. The other steps are the same as those described above.
[0027] Fig. 4 illustrates a flow chart for processing raw iron ore or ore tailing with an iron grade of 25-40%, including the following steps of: crushing, screening grinding gravity separation reverse flotation producing coarse iron ore concentrate blending with addition of complex additive pellet making drying and preheating reducing roasting directly cooling in water ball grinding magnetic separating ball grinding magnetic separating or reverse flotation separating. The main technical processes are described as: crushing and grinding the low grade iron ore (iron grade of 25-40%); then desilicating and dealuminizing by reverse flotation separation to improve iron grade to the range of 40-50%; processing with the steps of pellet making, drying, preheating and reducing roasting, cooling in water directly, grinding, and magnetic separating to produce high grade direct reduced iron powder. After being dried and briquetting pressed, the iron powder can be used as electric furnace material.
[0028] As a result, the present invention provides the following advantages: [0029] By sort processing the complex iron ores according to class and grade, the ore lump can be added into the furnace directly, the fine grained ore powder can be grinded further for pellet making. By reducing roasting the pellet with the addition of complex additive, the reducing roasting effect is improved, the conversion rate of hematite and 00
O
r1 goethite converting into magnetite is increased, and the magnetic separation effect is Sstrengthened.
[0030] Besides, the complex additive added in the present invention also functions as bonding and reducing agents, and thus it is not needed to add bonding agent again to ensure enough strength and thermal stability of the raw pellet; at the same time, the c, complex additive also functions to reduce hematite and thus to increase reducing speed.
[0031] In the present invention, ore dressing method is utilized to pre-concentrate low 0grade iron ore to increase the iron grade, so that the processing capacity of subsequent reducing roasting is reduced significantly, the grade and recovery rate of the iron ore concentrate can be increased largely, and the energy consumption can be decreased.
[0032] The reducing roasting method includes weak reducing roasting and strong reducing roasting, the weak reducing roasting can reduce iron oxides to magnetic minerals, the strong reducing roasting can reduce iron oxide to metal iron, so that the problem that oxide bearing ore is difficult to be separated due to sliming during ore grinding is resolved effectively, especially it is best for separating micro-disseminated iron ores.
[0033] Besides, by adopting grate-rotary kiln or grate-shaft furnace apparatus for preheating and reducing roasting, and utilizing the waste gas from kiln end outlet to preheat the pellet ore in the grate so as to remove the crystalline water, the reducing roasting time can be shortened significantly and the energy consumption can be decreased. By adopting magnetic column or reverse flotation separation process to concentrate further the grinded micro size magnetite to remove silicon and aluminum, the process is simple, it is cost saving and space saving, and the separation process is efficient.
[0034] As a result, the final iron ore concentrate contains high iron and less silicon and aluminum impurities, the grain size is small, and it is not needed for further grinding to produce pellet, so that the pellet making process can be simplified, and pellet ore roasting temperature can be decreased, and the pellet making cost can be reduced.
00 CK1 [0035] Besides, in accordance with the present invention, the low grade iron ore or ore tailing can be used for producing direct reduced iron which can be used as electric furnace material, so that the steps of coke making, sintering, and blast furnace smelting can be saved, the waste gas discharge can be reduced, contributing to protect the environment.
[0036] Therefore, the present invention has wide promising market and application prospects. The raw ore grade of the ore to be mined can be reduced obviously, the ore storage reserves can be expanded, the sources for iron making raw materials can be 00 broadened to produce magnetic iron ore concentrate containing high iron, low silicon, and low aluminum, the energy consumption for making pellet ore can be saved, so that the iron making cost can be reduced. The present invention can also be used for producing direct reduced iron powder acting as raw material for electric furnace, so that the process flow can be shortened, the steps of coke making and sintering can be saved, and thus energy consumption can be decreased.
[0037] In certain embodiments of the present invention, high quality iron ore concentrate with composition of TFe 58-68%, FeO 19-27%, SiO 2 and A1 2 0 3 can be obtained by processing the limonite ore with an iron grade of 40-50% or 50-56% through the steps of reducing roasting magnetic separation flotation separation. 80-90% of the obtained iron ore concentrate has fineness degree of -0.043mm, the recovery rate of iron is 80-88%. Said magnetic iron ore concentrate can be used for making pellet ore directly.
[0038] In certain embodiments of the present invention, high quality iron ore concentrate with composition of TFe58-61%, SiO 2 and A1 2 0 3 can be obtained by processing the limonite with an iron grade of 50-56% through the steps of gravity separation reverse flotation separation, and the recovery rate of iron is 81-89%. The obtained iron can be used as sintering material.
[0039] In certain embodiments of the present invention, high quality iron ore concentrate with composition of TFe 58-68%, FeO 18-27%, SiO 2 and A1 2 0 3 can be obtained by processing the hematite with an iron grade of 28-40% through the steps of gravity separation reverse flotation separation reducing roasting magnetic separation reverse flotation, the recovery rate of iron is 75-85%. Said magnetic iron ore 00 CK1 concentrate can be used for making pellet ore directly. The direct reduced iron powder with an iron content higher than 90% is produced through the steps of gravity separation reverse flotation separation direct reducing roasting magnetic separation, and can be used as electric furnace steelmaking material.
[0040] In certain embodiments of the present invention, particularly, high quality iron ore concentrate with composition of TFe 65-68%, FeO 21-27%, SiO 2 and A1 2 0 3 1.3can be obtained by processing the iron ore tailing with an iron grade of 28-35% through the steps of gravity separation (magnetic separation) flotation separation weak 00 reducing roasting magnetic separation, 80-90% of the ore concentrate fineness degree of -0.043mm, the recovery rate of iron is 65-80%. Said magnetic iron ore concentrate can be used for producing pellet ore directly. The direct reduced iron powder with an iron content higher than 90% is produced through the steps of gravity separation reverse flotation separation direct reducing roasting magnetic separation, and can be used as electric furnace steelmaking material.
[0041] In certain embodiments of the present invention, the direct reduced iron powder can be used for preparing high quality lump for electric furnace steelmaking after being briquette pressed with the addition of complex agent and dried. The complex agent comprises 70-90% tung oil and 30-10% quicklime in mass ratio, and is pressed into lump with a dimension of 30 X 40 mm, and then is dried under a temperature of 200-300'C to remove moisture completely.
DESCRIPTION OF RELATED DRAWINGS [0042] Fig. 1 illustrates a process for processing iron ore with an iron grade of 50-56% in accordance with one embodiment of the present invention; [0043] Fig. 2 illustrates a process for processing iron ore with an iron grade of 50-56% in accordance with another embodiment of the present invention; [0044] Fig. 3 illustrates a process for processing iron ore with an iron grade of 40-50% in accordance with one embodiment of the present invention; and [0045] Fig. 4 illustrates a process for processing iron ore with an iron grade of 25-40% in accordance with one embodiment of the present invention.
00 C DETAILED DESCRIPTION OF THE EMBODIMENTS [0046] The embodiments of the present invention are hereinafter described, and the present invention is not limited to these embodiments.
Embodiment 1 [0047] With reference to Fig. 3, the raw limonite ore with an iron grade of 40.2% is crushed and screened into ore lump and ore powder. Dry grinding the ore powder with fineness degree of -15mm on a high pressure rolling grinder to get fineness degree of 00 0.074mm (90% proportion); blending the grinded ore powder with the addition of 4% complex additive humic acid and 3% bituminous coal with fineness degree of 0.074mm); applying the blended mixture to make pellet on the disc pelletizer, the moisture content for pellet making is 10-12%, the pellet making time is IOminutes, the grain size of the raw pellet is 8-20mm. The drying temperature of raw pellet is 260'C, the drying time is 8minutes, the preheating temperature is 550'C, the preheating time is 6 minutes, the reducing roasting temperature is 800'C, the roasting time is 15 minutes, the addition ratio of bituminous coal is 280-350Kg/ton. The roasted product can be cooled in water directly for crushing and magnetic separation. Processing the ore lump with the steps of: drying and preheating on the grate, reducing roasting in a rotary kiln, cooling in water, grinding on ball grinder, magnetic separation, ball grinding, and reverse flotation separation, and by controlling the reducing temperature and the addition ratio of reducing coal, high quality iron ore concentrate can be produced. Laying the ore lump on the bottom of the grate acting as grate layer material, then disposing the pellet on the ore lump. With the ball grinder, the fineness degree of first grinding is -0.074mm proportion), through two stage magnetic separation, the obtained coarse magnetic ore concentrate is grinded again. The fineness degree of the second grinding is -0.043mm proportion), the fine grinded product is then transported into a magnetic separation column or barrel magnetic separator for separation to get fine magnetic iron ore concentrate with composition of TFe 65.8%, FeO 26.4%, SiO 2 A1 2 0 3 the fineness degree of the ore concentrate is -0.043mm (85% proportion), the recovery rate of iron is 78.0%. By processing the magnetic iron ore concentrate through reverse flotation separation with the addition of lauryl amine as collector (500g/ton), quicklime as 00 C,1 activator (2kg/ton), pine wine oil as bulb former (120g/ton), NaOH as pH value adjuster (pH9-10), the A1 2 0 3 content can be decreased to Controlling the temperature inside of the rotary in the range of 1000-1100 0 C, the roasting time in the range of 2-3 hours, and the coal injection ratio as 100Kg/pellet to obtain the reduced product. By processing the reduced product through the steps of cooling and dry magnetic separation, and then crushing, grinding, and magnetic separation, to produce high quality reduced iron powder with an iron grade higher than 90%. By pressing the reduced iron powder with the addition of 5% agent (80% tung oil, 20% quicklime) to form lump with a 00 00 dimension of 30 X 40 mm, and drying the lump with a temperature of 200-300 0 C for minutes so as to produce raw material for electric furnace steelmaking.
Embodiment 2 [0048] With reference to Fig. 1, the limonite with an iron grade of 50.3% is crushed and screened first. Grinding the ore lump with fineness degree of -15mm to -1.0mm, then washing the grinded ore lump by screw washer to deslime ore with fineness degree of 0.074mm. Grinding ore lump with fineness degree of -0.074mm to -0.59mm, then washing the grinded product by screw washer to deslime ore with fineness degree of 0.074mm. Separating coarse fineness degree ore lump by spiral chute to produce iron ore concentrate with an iron grade of 58-60%. Combining the deslimed product (fineness degree of -0.074mm) together, and processing with the steps of dehydrating, drying, and grinding with high pressure rolling grinder to fineness degree of -0.074mm (89.5% proportion); adding 4.5% complex additive humic acid sodium and 3% bituminous coal); blending the mixture uniformly and then making pellet in the disc pelletizer with pellet making moisture of 10-12% and pellet making time of 10 minutes to produce raw pellet with grain size of 8-20mm. The drying temperature for the raw pellet is 260 0 C, drying time is 8 minutes, preheating temperature is 550°C, preheating time is 6 minutes, reducing roasting temperature is 820 0 C, roasting time is 15 minutes, addition ratio of bituminous coal is 280-350Kg/ton ore, the roasted product can be cooled in water directly. For the ore lump with grain size of 15-35mm, adding them directly into the grate as grate layer material; processing with the steps of drying, preheating, and reducing roasting in the rotary kiln; cooling the roasted product directly in water. Processing the 00 1 water-cooled products through the steps of grinding, magnetic separation, ball grinding, and reverse flotation separation to produce high quality iron ore concentrate. Laying the ore lump on the bottom of the grate acting as grate layer material, and then disposing the pellets onto the ore lump. Grinding the roasted pellet and ore lump together on the ball grinder, the first grinding fineness degree is -0.074mm (85% proportion); processing with two stage magnetic separation to get coarse magnetic ore concentrate; further grinding Sthe coarse magnetic ore concentrate to fineness degree of -0.043mm (90% proportion); 0 transporting the fine grinded product into magnetic separation column and barrel 00 magnetic separator for separation to get the final magnetic iron ore concentrate with a Scomposition of TFe66.7%, FeO 26.8%, SiO 2 A1 2 0 3 and fineness degree of 0.043 (87% proportion), the recovery rate of iron is 81.9%. By processing the magnetic iron ore concentrate through reverse flotation separation with the addition of lauryl amine as collector (500g/ton), quicklime as activator (2kg/ton), pine wine oil as bulb former (120g/ton), NaOH as pH value adjuster (pH9-10), the A1 2 0 3 content can be decreased to 1.7%.
Embodiment 3 [0049] With reference to Fig. 1, the limonite with an iron grade of 55.8% is crushed and screened first. Grinding the ore lump with fineness degree of -15mm to -1.0mm, then washing the grinded ore lump by screw washer to deslime ore with fineness degree of 0.074mm. Grinding ore lump with fineness degree of -0.074mm to -0.59mm, then washing the grinded product by screw washer to deslime ore with fineness degree of 0.074mm. Separating coarse fineness degree ore lump by spiral chute to produce iron ore concentrate with an iron grade of 58-60%. Combining the deslimed product (fineness degree of -0.074mm) together, and processing with the steps of dehydrating, drying, and grinding with high pressure rolling grinder to fineness degree of -0.074mm (90.8% proportion); adding 5% complex additive humic acid sodium and 3% bituminous coal); blending the mixture uniformly and then making pellet in the disc pelletizer with pellet making moisture of 10-12% and pellet making time of 10 minutes to produce raw pellet with grain size of 8-20mm. The drying temperature for the raw pellet is 260 0 C, drying time is 8 minutes, preheating temperature is 550°C, preheating time is 6 00 minutes, reducing roasting temperature is 850'C, roasting time is 15 minutes, addition tratio of bituminous coal is 280-350Kg/ton ore. Processing the roasted product with the steps of cooling in water directly, grinding, magnetic separation, and reverse flotation separation to get high quality iron ore concentrate. For the ore lump with grain size of transporting them into the grate for drying and preheating, and then into rotary kiln for reducing roasting, and the cooling them in water. Processing the water-cooled roasted pellet ore and ore lump together through the steps of grinding, magnetic separation, and reverse flotation separation to get high quality iron ore concentrate.
00 Laying the ore lump on the bottom of the grate acting as grate layer material, and then Sdisposing the pellets onto the ore lump. Grinding the roasted pellet and ore lump together on the ball grinder, the first grinding fineness degree is -0.074mm (84.9% proportion); processing with two stage magnetic separation to get coarse magnetic ore concentrate; further grinding the coarse magnetic ore concentrate to fineness degree of -0.043mm (89.7% proportion); transporting the fine grinded product into magnetic separation column for separation to get the final magnetic iron ore concentrate with a composition of TFe68.1%, FeO 27.7%, SiO 2 A1 2 0 3 and fineness degree of -0.043 (88.1% proportion), the recovery rate of iron is 84.9%. By processing the magnetic iron ore concentrate through reverse flotation separation with the addition of lauryl amine as collector (680g/ton), quicklime as activator (2kg/ton), pine wine oil as bulb former (180g/ton), NaOH as pH value adjuster (pH9-10), the A1 2 0 3 content can be decreased to Embodiment 4 [0050] With reference to Fig. 2, the limonite with an iron grade of 50.3% is crushed and screened to fineness degree of -15mm, and then is grinded to fineness degree of -0.59mm, and then is gravity separated with spiral chute to get gravity separated coarse ore concentrate 1 and ore tailing 1. Second grinding the gravity separated coarse ore concentrate 1 to get fineness degree of -0.1 mm, and then gravity separating the fine grinded product with spiral chute to get gravity separated coarse ore concentrate 1 and ore tailing 2. Third grinding the gravity separated coarse ore concentrate 2 to fineness degree of -0.075mm (75.8% proportion). Combining the ore tailing 1 and ore tailing 2 for 00 CK1 magnetic separation with high gradient magnetic separator to get coarse ore concentrate.
Combining the magnetic separated coarse ore concentrate and gravity separated ore concentrate and then processing with steps of reverse flotation separation for desilicating and dealuminize to get final iron ore concentrate and ore tailing 3. The conditions for reverse flotation separation is using lauryl amine as collector (450g/ton), quicklime as activator (2kg/ton), pine wine oil as bulb former (150g/ton), NaOH as pH value adjuster (pH9-10). Reverse flotation separating the ore sludge directly with conditions similar to Sfurther grinding of coarse ore concentrate to get high quality iron ore concentrate with 00 composition of TFe 58.9%, SiO 2 and A1 2 0 3 the recovery rate of iron is 81.3%, the iron can be used for sintering material. Combining the two ore tailings 3 and blending them with the addition of complex additive to make pellet. Processing the raw pellet with the steps of drying and preheating, reducing roasting, cooling in water, ball grinding, magnetic separation, ball grinding, and flotation separation or reverse flotation separation so as to get magnetic iron ore concentrate and reduced iron powder.
Embodiment [0051] With reference to Fig. 2, crushing and screening the limonite with an iron grade of 55.8% to fineness degree of -15mm, and then first grinding them to fineness degree of -0.59mm; gravity separating with spiral chute to get gravity separated coarse ore concentrate 1 and ore tailing 1. Second grinding the gravity separated coarse ore concentrate to fineness degree of -0.1 mm; then gravity separating with spiral chute to get gravity separated coarse ore concentrate 2 and ore tailing 2. Third grinding the gravity separated ore concentrate 2 to fineness degree of -0.075mm (80% proportion).
Combining ore tailing 1 and ore tailing 2 for magnetic separation with high gradient magnetic separator to get coarse ore concentrate and ore tailing 3. Combining first the magnetic separated coarse ore concentrate and gravity separated ore concentrate for delicating and dealuminizing by reverse flotation separation to produce the final iron ore concentrate. The conditions for reverse flotation separation is using lauryl amine as collector (720g/ton), quicklime as activator (1.52kg/ton), pine wine oil as bulb former (150g/ton), NaOH as pH value adjuster (pH9-10). Reverse flotation separating the ore sludge directly with conditions similar to further grinding of coarse ore concentrate to get high quality iron ore concentrate with composition of TFe 60.9%, SiO 2 and A1 2 0 3 00 CK1 the recovery rate of iron is 83.3%, and can be as sintering material. Combining the two ore tailings 3 for blending with the addition of complex additive to make pellet; processing the raw pellet with the steps of drying and preheating, reducing roasting, cooling in water, ball grinding, magnetic separation, ball grinding, and magnetic separation or reverse flotation separation to get magnetic iron ore concentrate and reduced iron powder.
Embodiment 6 [0052] With reference to Fig. 4, processing the hematite with an iron grade of 28.3% 00 Swith the steps of crushing-screening-grinding-gravity separation-reverse flotation C, separation to get coarse iron ore concentrate. Applying spiral chute for gravity separation for desliming, and then grinding the coarse ore concentrate with ball grinder to get fineness degree of 0.074mm (75% proportion); high gradient magnetic separating the deslimed product to recover part of the coarse ore concentrate, and then combining the magnetic separated coarse ore concentrate and the gravity separated ore concentrate for reverse flotation separation for deslicating and dealuminizing to improve the iron grade to Grinding the flotation separated ore concentrate first for further reverse flotation separation to get fine grained coarse iron ore concentrate with an iron grade of 41.4%, the recovery rate of iron is Processing the iron ore concentrate with the steps of blending with addition of complex additive-making pellet-drying and preheatingreducing roasting-cooling in water-ball grinding-magnetic separation-ball grindingreverse flotation separation to produce high quality iron ore concentrate. Conditions for making pellet: adding 4.5% complex additive humic acid sodium and 3% bituminous coal, and then blending the mixture first for making pellet in the disc pelletizer, the moisture for making pellet is 8-9% and the time is 9-10 minutes, the grain size of raw pellet is 8-16mm. The drying temperature of raw pellet is 280'C, the drying time is 8minutes, the preheating temperature is 600'C, the preheating time is 6minutes, the reducing roasting temperature is 900'C, the roasting time is 15 minutes, the addition ratio of bituminous coal is 300-380Kg/ton, the roasted product can be cooled in water directly for crushing and magnetic separation. The reverse flotation separation is applying lauryl amine as collector (550g/ton), quicklime as activator (2.3kg/ton), pine wine oil as 00
O
,1 bulb former (200g/ton), NaOH as pH value adjuster (pH9-10) to produce high quality magnetic iron ore concentrate with composition of TFe 58.9%, FeO 18-27%, SiO 2 6.2%, and A1 2 0 3 The magnetic iron ore concentrate can be used directly for producing pellet ore. The recovery rate of iron is 80.1%.
Embodiment 7 c1 [0053] With reference to Fig. 4, processing the hematite with an iron grade of 39.7% Swith the steps of crushing-screening-grinding-gravity separation-reverse flotation Sseparation to get coarse iron powder concentrate. Applying spiral chute for gravity Sseparation for desliming, and then grinding the coarse ore concentrate with ball grinder to get fineness degree of 0.074mm (75% proportion); high gradient magnetic separating the deslimed product to recover part of the coarse ore concentrate, and then combining the magnetic separated coarse ore concentrate and the gravity separated ore concentrate for reverse flotation separation for deslicating and dealuminizing to improve the iron grade to Grinding the flotation separated ore concentrate first for further reverse flotation separation to get fine grained coarse iron ore concentrate with an iron grade of 55.8%, the recovery rate of iron is Processing the iron ore concentrate with the steps of blending with addition of complex additive-making pellet-drying and preheatingreducing roasting-cooling in water-ball grinding-magnetic separation-ball grindingreverse flotation separation to produce high quality iron ore concentrate. Conditions for making pellet: adding 4.5% complex additive humic acid sodium and 3% bituminous coal, and then blending the mixture first for making pellet in the disc pelletizer, the moisture for making pellet is 9% and the time is 10 minutes, the grain size of raw pellet is 8-16mm. The drying temperature of raw pellet is 270 0 C, the drying time is 9minutes, the preheating temperature is 590°C, the preheating time is 7minutes, the reducing roasting temperature is 880 0 C, the roasting time is 17 minutes, the addition ratio of bituminous coal is 350-390Kg/ton, the roasted product can be cooled in water directly.
The reverse flotation separation is applying lauryl amine as collector (750g/ton), quicklime as activator (2.6kg/ton), pine wine oil as bulb former (250g/ton), NaOH as pH value adjuster (pH9-10) to produce high quality magnetic iron ore concentrate with composition of TFe 65.9%, FeO 18-27%, SiO 2 and A1 2 0 3 The magnetic iron 00 CK1 ore concentrate can be used directly for producing pellet ore. The recovery rate of iron is 83.1%.
Embodiment 8 [0054] With reference to Fig. 4, processing the hematite with an iron grade of 28.3% with the steps of crushing-screening-grinding-gravity separation-reverse flotation separation to get coarse iron powder concentrate. Applying spiral chute for gravity Sseparation for desliming, and then grinding the coarse ore concentrate with ball grinder to 0get fineness degree of 0.074mm (75% proportion); high gradient magnetic separating the 00 Sdeslimed product to recover part of the coarse ore concentrate, and then combining the C, magnetic separated coarse ore concentrate and the gravity separated ore concentrate for reverse flotation separation for deslicating and dealuminizing to improve the iron grade to Grinding the flotation separated ore concentrate first for further reverse flotation separation to get fine grained coarse iron ore concentrate with an iron grade of 41.4%, the recovery rate of iron is Processing the iron ore concentrate with the steps of blending with addition of complex additive-making pellet-drying and preheating-strong reducing roasting-cooling in water-ball grinding-magnetic separation-ball grindingreverse flotation separation to produce high quality iron powder containing TFe 90.2%.
Said iron powder is a good raw material for electric furnace steelmaking after being pressed to ore lump with dimension of 20-40mm. The overall recovery rate of iron is 84.3%. Conditions for making pellet: adding 3% complex additive humic acid sodium and 1.5% bituminous coal, and then blending the mixture first for making pellet in the disc pelletizer, the moisture for making pellet is 9% and the time is 12 minutes, the grain size of raw pellet is 8-16mm. The drying temperature of raw pellet is 270 0 C, the drying time is 9minutes, the preheating temperature is 900 0 C, the preheating time is the reducing roasting temperature is 1020 0 C, the roasting time is 180 minutes, the addition ratio of bituminous coal is 950-1000Kg/ton. Cooling the reduced pellet directly in water, and through the steps of crushing and magnetic separation, reduced iron powder can be obtained. Pressing the reduced iron powder with the addition of 6% agent tung oil and 30% quicklime) to get lump with dimension of 30 X 40 mm; drying the 00 lump for 80 minutes under temperature of 200-300'C to produce material for electric tfurnace steelmaking.
Embodiment 9 [0055] With reference to Fig. 4, processing the hematite with an iron grade of 39.7% with the steps of crushing-screening-grinding-gravity separation-reverse flotation separation to get coarse iron powder concentrate. Applying spiral chute for gravity separation for desliming, and then grinding the coarse ore concentrate with ball grinder to 0get fineness degree of 0.074mm (75% proportion); high gradient magnetic separating the deslimed product to recover part of the coarse ore concentrate, and then combining the magnetic separated coarse ore concentrate and the gravity separated ore concentrate for reverse flotation separation for deslicating and dealuminizing to improve the iron grade to Grinding the flotation separated ore concentrate first for further reverse flotation separation to get fine grained coarse iron ore concentrate with an iron grade of 55.8%, the recovery rate of iron is Processing the iron ore concentrate with the steps of blending with addition of complex additive-making pellet-drying and preheating-strong reducing roasting-cooling in water-ball grinding-magnetic separation-ball grindingreverse flotation separation to produce high quality iron powder containing TFe 92.4%.
Said iron powder is a good raw material for electric furnace steelmaking after being pressed. The overall recovery rate of iron is 86.1%. Conditions for making pellet: adding 3% complex additive humic acid sodium and 1.5% bituminous coal, and then blending the mixture first for making pellet in the disc pelletizer, the moisture for making pellet is 9.5% and the time is 10 minutes, the grain size of raw pellet is 8-16mm. The drying temperature of raw pellet is 290'C, the drying time is 8minutes, the preheating temperature is 850'C, the preheating time is 12minutes, the reducing roasting temperature is 1050'C, the roasting time is 180 minutes, the addition ratio of bituminous coal is 960Kg/ton. Cooling the reduced pellet directly in water, and through the steps of crushing and magnetic separation, reduced iron powder can be obtained. Pressing the reduced iron powder with the addition of 8% agent (90% tung oil and 10% quicklime) to get lump with dimension of 30 X 40 mm; drying the lump for 100 minutes under temperature of 200-300'C to produce material for electric furnace steelmaking.
00 Embodiment [0056] With reference to Fig. 4, processing and concentrating the iron ore tailing with an iron grade of 28.6% with the steps of crushing-screening-grinding-high gradient magnetic O separation-reverse flotation separation to get coarse iron ore concentrate. Desliming the coarse iron ore concentrate with spiral chute first and then reverse flotation separating to get coarse iron ore concentrate with an iron grade of 40.1%, the recovery rate of iron is 88%. Processing the coarse iron ore concentrate with the steps of blending with addition of complex additive-making pellet-drying and preheating-reducing roasting-cooling in 00 water-ball grinding-magnetic separation-ball grinding-reverse flotation separation. If applying weak reducing roasting, high quality iron ore concentrate of TFe 62.3%, FeO 21.5%, SiO 2 and A1 2 0 3 1.9% can be obtained, the recovery rate of iron is 78.5%, and can be used directly for producing pellet ore. If applying strong reducing roasting, direct reduced iron powder with composition of TFe 90.0% can be obtained, the recovery rate of iron is 78.9%. Conditions for making pellet: adding 3% complex additive (1% humic acid sodium and 2% bituminous coal, and then blending the mixture first for making pellet in the disc pelletizer, the moisture for making pellet is 7.8% and the time is minutes, the grain size of raw pellet is 8-16mm. The drying temperature of raw pellet is 410'C, the drying time is 8minutes, the preheating temperature is 880'C, the preheating time is 15minutes, the weak reducing roasting temperature is 890'C and the roasting time is 18 minutes, the addition ratio of bituminous coal is 350-390Kg/ton; the strong reducing roasting temperature is 1080'C and the roasting time is 170 minutes, the addition ratio of bituminous coal is 1000Kg/ton. Cooling the reduced pellet directly in water, and through the steps of crushing and magnetic separation, reduced iron powder can be obtained. Pressing the reduced iron powder with the addition of 4% agent tung oil and 25% quicklime) to get lump with dimension of 30 X 40 mm; drying the lump for 95 minutes under temperature of 200-300'C to produce material for electric furnace steelmaking.
Embodiment 11 [0057] With reference to Fig. 4, processing and concentrating the iron ore tailing with an iron grade of 34.7% with the steps of crushing-screening-grinding-high gradient magnetic 00 CK1 separation-reverse flotation separation to get coarse iron ore concentrate. Desliming the coarse iron ore concentrate with spiral chute or high gradient magnetic separation and then reverse flotation separating to get coarse iron ore concentrate with an iron grade of 44.6%, the recovery rate of iron is 87.5%. Processing the coarse iron ore concentrate with the steps of blending with addition of complex additive-making pellet-drying and preheating-reducing roasting-cooling in water-ball grinding-magnetic separation-ball grinding-reverse flotation separation. If applying weak reducing roasting, high quality iron ore concentrate of TFe 65.3%, FeO 28.5%, SiO 2 and A1 2 0 3 1.9% can be 00 obtained, the recovery rate of iron is 82.6%, and can be used directly for producing pellet Sore. If applying strong reducing roasting, direct reduced iron powder with composition of TFe 90.2% can be obtained, the recovery rate of iron is 79.6%. Conditions for making pellet: adding 5% complex additive humic acid sodium and 3.5% bituminous coal, and then blending the mixture first for making pellet in the disc pelletizer, the moisture for making pellet is 8.7% and the time is 15 minutes, the grain size of raw pellet is 8- 16mm. The drying temperature of raw pellet is 350'C, the drying time is 7 minutes, the preheating temperature is 950'C, the preheating time is 12 minutes, the weak reducing roasting temperature is 900'C and the roasting time is 17 minutes, the addition ratio of bituminous coal is 350-390Kg/ton; the strong reducing roasting temperature is 1030'C and the roasting time is 180 minutes, the addition ratio of bituminous coal is 1050Kg/ton.
Cooling the reduced pellet directly in water, and through the steps of crushing and magnetic separation, reduced iron powder can be obtained. Pressing the reduced iron powder with the addition of 5% agent (80% tung oil and 20% quicklime) to get lump with dimension of 30 X 40 mm; drying the lump for 90 minutes under temperature of 200-300'C to produce material for electric furnace steelmaking.
Embodiment 12 [0058] With reference to Fig. 4, processing and concentrating the iron ore tailing with an iron grade of 25.6% with the steps of crushing-screening-grinding-high gradient magnetic separation-reverse flotation separation to get coarse iron ore concentrate. Desliming the coarse iron ore concentrate with spiral chute or high gradient magnetic separation and then reverse flotation separating to get coarse iron ore concentrate with an iron grade of 00 C1 40.1%, the recovery rate of iron is 88%. Processing the coarse iron ore concentrate with the steps of blending with addition of complex additive-making pellet-drying and preheating-strong reducing roasting-cooling in water-ball grinding-magnetic separationball grinding-reverse flotation separation to get high quality iron powder with composition of TFe 90.3%, the recovery rate of iron is 80.3%, and can be used for electric furnace steelmaking. Conditions for making pellet: adding 4% complex additive humic acid sodium and 2% bituminous coal, and then blending the mixture first for Smaking pellet in the disc pelletizer, the moisture for making pellet is 8.8% and the time is 00 13 minutes, the grain size of raw pellet is 8-16mm. The drying temperature of raw pellet Sis 410'C, the drying time is 7 minutes, the preheating temperature is 980'C, the preheating time is 15 minutes, the reducing roasting temperature is 1050'C and the roasting time is 180 minutes, the addition ratio of bituminous coal is 900Kg/ton. Cooling the reduced pellet directly in water, and through the steps of crushing and magnetic separation, reduced iron powder can be obtained. Pressing the reduced iron powder with the addition of 4% agent (80% tung oil and 20% quicklime) to get lump with dimension of 30 X 30 mm; drying the lump for 75 minutes under temperature of 200-300'C to produce material for electric furnace steelmaking.
Claims (4)
- 2. The separation method according to claim 1, wherein said additive for the blending process is complex additive, comprising humic acids and bituminous coal with a mass ratio of 0.5-3:1-4.
- 3. The separation method according to claim 1, wherein said ore lump has grain size larger than 15mm, while said fine grained ore powder has grain size smaller than 00 CK1 4. The separation method according to claim 1, wherein said processes of drying and preheating and reducing roasting are performed by using grate-rotary kiln or grate-shaft kiln, the pellet ore is preheated on the grate by the hot waste gas from the kiln end outlet in order to remove the crystalline water. The separation method according to claim 1, wherein said iron ore with an iron grade of 50-56% is crushed and screened into ore lump and fine grained ore powder, the ore lump with grain size of 15-30mm is added directly into the grate for drying and preheating and then is transported into the rotary kiln for reducing roasting. 00 S6. The separation method according to claim 1, wherein said iron ore with an iron grade C, of 50-56% is crushed and screened into ore lump and fine grained ore powder, the fine grained ore powder with grain size less than 15mm is preferably grinded, washed by screw washer, deslimed by grinding cyclone, and separated by spiral chute.
- 7. The separation method according to claim 1, wherein said iron ore with an iron grade of 50-60% is crushed, screened, and grinded first, and is gravity separated by spiral chute to get coarse iron ore concentrate 1 and ore tailing 2; the coarse ore concentrate 1 is second grinded and then is gravity separated by spiral chute to get coarse ore concentrate 2 and ore tailing 2; the ore tailing 1 and ore tailing 2 are combined and then are high gradient magnetic separated to get coarse ore concentrate 3 and ore tailing 3; the coarse ore concentrate 2 is grinded first and is combined with the coarse ore concentrate 3, and then is reverse flotation separated to get iron ore concentrate and ore tailing 3; the two ore tailings 3 are combined and then are processed with subsequent steps of drying and preheating, and reducing roasting. 8 The separation method according to claim 7, wherein the raw iron ore or ore tailing is crushed and screened to grain size of 15-20 first for further grinding. 9 The separation method according to claim 1, wherein said ore lump with grain size of
- 15-30mm obtained from the crushing of iron ore with an iron grade of 40-50% is transported into the grate directly for drying and preheating, and into the rotary kiln for reducing roasting. 00 10 The separation method according to claim 1 or claim 9, wherein during the crushing and screening of the iron ore with an iron grade of 40-50%, the reducing roasting is performed with grate-shaft furnace, the hot source of the grate is from the waste gas from the kiln end outlet, the preheated pellets or ore is transported into the shaft furnace directly or is added into the shaft furnace by bucket elevator. 11 The separation method according to claim 10, wherein the combustion chamber is used for heating the shaft furnace, the temperature of the combustion chamber is controlled in the range of 900-1000°C, the air excess rate is controlled in the range of 0.8- 00 in order to supply weakly reducing atmosphere. 12 The separation method according to claim 11, wherein said iron ore with an iron grade of 25-40% is crushed and screened into ore lump and fine grained ore powder, the ore lump with preferable grain size of 15-20mm is dried and preheated directly. 13 The separation method according to claim 1, wherein the iron ore with an iron grade of 25-40% is crushed and screened into ore lump and fine grained ore powder, said fine grained ore powder with grain size less than 15mm is grinded; optionally, the ore powder with grain size less than 15mm in the raw iron ore or ore tailings can be grinded directly. 14. The separation method according to claim 1, wherein the reduced iron powders is briquetting pressed and dried with the addition of complex agent, said complex agent contains 70-90% tung oil and 30-10% quicklime in mass ratio.
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