CN103993166B - A kind of method that low-grade iron ore is upgrade - Google Patents
A kind of method that low-grade iron ore is upgrade Download PDFInfo
- Publication number
- CN103993166B CN103993166B CN201410200461.3A CN201410200461A CN103993166B CN 103993166 B CN103993166 B CN 103993166B CN 201410200461 A CN201410200461 A CN 201410200461A CN 103993166 B CN103993166 B CN 103993166B
- Authority
- CN
- China
- Prior art keywords
- iron ore
- low
- grade
- coal
- ore
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
A kind of method that low-grade iron ore is upgrade, first low-grade iron ore and coal are carried out pretreatment respectively, interior coal blending powder and additive, after iron mine and Coal pretreatment material, 0.074mm grain size content reaches more than 50%, the clay mineral that available low-grade iron ore carries is as binding agent, or add the binding agent mixings such as a small amount of bentonite, use disk or pelletising drum to make the bead that particle diameter is 3～8mm.Granulation bead uses belt or drum drier etc. to be dried, and then uses rotary kiln to reduce, and after cooling, magnetic separation obtains high-grade iron ore concentrate.Using the present invention can effectively process low-grade iron ore, in using, coal blending and additive are pelletized and are reduced directly, and magnetic separation obtains high-grade iron ore concentrate, has feature energy-conservation, efficient, quick.
Description
Technical field
The method that the present invention relates to a kind of iron ore reduction roasting-magnetic separation, particularly to coal blending and additive in a kind of low-grade iron ore
Granulation coal base middle temperature fast restore-magnetic selection method.
Background technology
Along with the development of modern steel industry, China's iron and steel output rises year by year, domestic high-quality ferrolite supply deficiency problem
Day by day serious, mineral resources have become " bottleneck " of restriction China development of iron & steel industry.Along with the high speed development of steel and iron industry,
The demand of China iron deposit stone sharply increases, 2009 so far China imported Fe ore amount increase by 21.8% every year, import volume is not
Disconnected soaring, also make the importation dependence of China iron deposit stone improve constantly, 2012, China iron deposit stone importation dependence was about 63%.
China iron deposit stone resource is rich and the richest, and in about 58,100,000,000 t reserves (occupying the 4th, the world), 97% is lean ore, average product
Position is 33%, and less than World Iron Ore average grade 11 percentage points, the Iron grade rich ore more than 50% only accounts for 2.7% (about 15
Hundred million t), and overwhelming majority iron ore must can enter stove after beneficiation enrichment and smelt.China's iron ore type is various, main Types and ratio
Example is: magnetic iron ore type 55.40%, hematite-type 18.10%, siderite type 14.40%, vanadium titano-magnetite type 5.30%, mirror
Iron mine type 3.40%, limonite type 1.10%, mixed type 2.30%.The grade of low-grade iron ore refer to 45%～50% with
Under.In China iron deposit stone ore bed, major part iron ore contains the iron mine material of two or more type, and make iron mine can
The property selected declines.In iron ore containing weak magnetism mineral such as bloodstone, speculum iron, goethitum, siderite and limonite time usually
It is difficult to effectively utilize.For accounting for, the embedding cloth of the granularity of gross reserves more than 25% is thin, stone-like pulse is the most quartzy and the red ferrum of Iron-containing silicate
The complicated difficult such as ore deposit and low-grade limonite selects the technique of preparing of ferric oxide ore still without breakthrough.Use magnetizing roast-magnetic separation
Can effectively process some low-grade iron ore, as stone-like pulse is mainly the hematite of Iron-containing silicate, after magnetic separation concentrate Iron grade up to
55%-66%, the response rate 70%～85%[1], it is difficult to control to yet with reduction process and reduces the problem such as uneven cause roasting energy consumption
Greatly, product index is the highest, and production cost is high[2].It is current primary study that the method using direct-reduction-magnetic separation processes low-grade ore
Direction, at reduction temperature 1100 DEG C～1200 DEG C, reduce 90min～120min, available Iron grade and the response rate are all 90%
Above concentrate[3-6], can effectively process fine grain teeth cloth bloodstone.But, owing to low-grade iron ore contains substantial amounts of stone-like pulse ore deposit
Thing is (such as SiO2Deng), a large amount of fayalite liquid phase can be produced within the temperature range of 1100 DEG C～1200 DEG C, raw to direct-reduction
The direct motion produced carries out producing impact, and energy consumption is high, the time is long, remains in laboratory stage at present, makes the type iron mine provide
Source can not fully recycle.
List of references:
[1] Ren Yafeng, Yu Yongfu. the Refractory red iron ores magnetizing roast state of the art and developing direction. metal mine, 2005 (11):
20-23.
[2] Zhu Jiaji etc. China's ferrum technique of preparing [M]. Beijing: metallurgical industry publishing house, 1994:328-338.
[3] Zhu Deqing, Zhai Yong, Pan Jian, etc. coal-based direct reduction-magnetic separation Super-fine lean hematite ore new technology [J]. Central South University is learned
Report (natural science edition), 2008,39 (6): 1132-1138. (document difference important with the present invention is wherein？？
The most illustratively, including the comparative illustration of effect)
[4] Zhu Deqing, Deng Xiulan, the spring iron army, etc. certain fine-grained dissemination lean hematite ore direct-reduction low intensity magnetic separation test [J]. metal
Mine, 2012 (2): 60-62,66.
[5] Wei Yuxia, granddaughter prosperous, Kou Jue, etc. the impact [J] on the direct-reduction roasting of certain refractory iron ore briquetting of the interior coal blending consumption.
Central South University's journal (natural science edition), 2013.44 (4): 1305-1311.
[6] Xu Bin, Zhuan Jianming, Bai Guohua, etc. the research of low-grade iron ore coal-based direct reduction. [J] mineral products comprehensively utilize,
2001(06):20-24.
Summary of the invention
It is an object of the invention to be to develop a kind of method being obtained fine quality iron concentrate by low-grade iron ore, can effectively solve low-grade
Iron mine is difficult to effectively utilize and reduction temperature height, recovery time length, easy ring formation and high in cost of production in coal-based DR process
Problem, thus effectively reduce enterprise's production cost, can effectively alleviate high-quality iron ore deposit situation in short supply and promote China
The development of steel and iron industry.
In order to solve above-mentioned technical problem, in the low-grade iron ore that the present invention provides, coal blending and the additive granulation middle temperature of coal base are quickly also
Former-magnetic selection method, including following preparation process:
(1) low-grade iron ore and coal are carried out respectively pretreatment and accounts for the most total matter to they granularities less than the grade quality of 0.074mm
Amount more than 50%；
(2) through the good iron mine of (1) step pretreatment and coal be 0.2～0.5 by C/Fe mass ratio, and add account for iron mine quality 2.0%～
NaCl or Na of 4.0%2CO3Additive, and use the clay mineral that carries of low-grade iron ore to account for iron mine as binding agent or interpolation
The 0.5% of quality～the bentonite of 2.0% carry out dispensing as binding agent；Dispensing is mixed into compound after adding water-wet；By compound
It is granulation into the granulation bead of a diameter of 3～8mm；
(3) the granulation bead (2) step obtained is dried, carries out coal base middle temperature fast restore, i.e. first by advance in rotary kiln
Hot warming temperature 200 DEG C is increased to 920 DEG C, and the time is 25min～50min, then at 920 DEG C～950 DEG C of reduction roasting 10min～
25min makes reducing material, and the cooling drums isolation air that reducing material is sprayed water by outside is cooled to 90 DEG C～110 DEG C, adopts after cooling
With dry magnetic separation isolated reduction roasting bead and carbon residue, carbon residue returns coal-based rotary kiln and uses；
(4) the reduction roasting little ball warp ore grinding obtained by (3) step, magnetic separation are obtained the iron ore concentrate upgrade.
Pretreatment described in step (1) is that ore grinding, profit mill or high pressure roller mill process.
Coal described in step (1) is to have brown coal, anthracite or the biomass carbon that fugitive constituent more than 25% reactivity is high.
In step (2), the particle diameter of granulation bead prepared by employing disc balling machine or pelletising drum is 3mm～8mm, and its moisture contains
Amount is 7%～11%.
In step (3), granulation bead uses drum drier etc. to be dried.
Granulation bead should meet after drying by the value of quality 0.5kg make its at a height of 0.5m after group 3 times less than 1.0mm
The pulverization rate condition less than 5%.
The process that is dried granulation bead described in above-mentioned steps (3) is the part thermal reduction utilizing rotary kiln reduction section out
Gas burning gases again are dried process to granulation bead, and remaining hot waste gas carries out heat exchange and becomes preheated air to use as rotary kiln burning
Air or use other UTILIZATION OF VESIDUAL HEAT IN measure to reclaim.
Little ball warp 10min of reduction roasting～20min ore grinding after cooling down in step (4), the grinding particle size quality less than 0.074mm contains
Amount is more than 95%, and during magnetic separation, magnetic field intensity is 1.4～2.0KA/m.
Inventor by groping repeatedly find by effective control iron mine and the coal particle size mass percent less than 0.074mm,
C/Fe mass ratio 0.2～0.5, additive NaCl or Na2CO3Content 2.0%～4.0%, the 3 of granulation bead～8mm several because of
The comprehensive collaborative of element processes, and makes full use of the clay mineral carried in low-grade iron ore or add bentonite as binding agent,
Can beneficially improve the balling-up of low-grade iron ore, obtained granulation bead can be prevented effectively from lump ore recovery time length, center
With the edge reduction problem such as lack of homogeneity；Can also be prevented effectively from fine ore reduction poor air permeability, dust flies upward impact with hot waste gas and sets
Standby direct motion also causes the problems such as iron mine loss, and the advantage of the inventive method also resides in and can make the process in reduction roasting stage can be more
Add the most even quicker.By the most collaborative of each factor of early stage of the present invention and controlling efficiently, the present invention can be real at rotary kiln
Coal blending and additive granulation coal base middle temperature fast restore in existing low-grade iron ore, only at a temperature of 920 DEG C～950 DEG C, and need to go back
The former time foreshortens to 10min～25min, so that coarse grain magnetic iron ore remains unchanged substantially in iron mine, thicker bloodstone is reduced into
Magnetic iron ore, becomes metallic iron and under Additive less than 0.010mm bloodstone part fast restore, and other gangue mineral base
This reduction not being varied without hindering iron oxides, the beneficially migration of metallic iron, merger are grown up, and obtain after magnetic separation
Fine quality iron concentrate.The interior coal blending and the additive that use the present invention are pelletized and are reduced directly, and magnetic separation obtains the comprehensive of high-grade iron ore concentrate
Method, can effectively process low-grade iron ore, has feature energy-conservation, efficient, quick.The method using the present invention,
During rotary kiln reduction, burning is with energy consumption mark coal less than 80kg/t iron ore, refers to far below conventional coal-based direct reduction rotary kiln energy consumption
Mark.For raw material Iron grade be 33.86%, SiO2Content be 40.61% low-grade iron ore and reduction coal fixed carbon percentage composition be
55.83%, volatile matter percentage composition is 36.03%, uses the present invention, can obtain reduction roasting bead nodulizing, available after magnetic separation
Concentrate grade and the response rate all can be in the very good effect of about 70%, some concentrate grades the most also excellent effect up to 74.57%.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the present invention.
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings.Wherein, raw material be Iron grade be 33.86%, SiO2Contain
Amount be 40.61% low-grade iron ore and reduction coal fixed carbon percentage composition be 55.83%, volatile matter percentage composition be 36.03%,
Comparative example 1
Weighing granularity is 12～16mm low-grade iron ore 4kg, and C/Fe ratio is 0.81, uses charge preheating temperature in Rotary tube furnace
It is 35min from 200 DEG C of heating-up times being increased to 950 DEG C, 950 DEG C of reduction roasting 25min；Reduction roasting ore deposit through ball milling 20min,
Ore milling concentration is 50%, and magnetic field intensity is 1.2KA/m magnetic separation；The response rate obtaining result magnetic separation of iron ore concentrate is 64.30%, essence
Ore deposit grade is 45.59%.
Comparative example 2
Weighing granularity is 1～3mm low-grade iron ore 4kg, and C/Fe ratio is 0.5, and in employing Rotary tube furnace, charge preheating temperature is from 200
The heating-up time DEG C being increased to 950 DEG C is 35min, 950 DEG C of reduction roasting 25min；Reduction roasting ore deposit is through ball milling 20min, ore grinding
Concentration is 50%, and magnetic field intensity is 1.4KA/m magnetic separation；The response rate obtaining result magnetic separation of iron ore concentrate is 68.47%, concentrate product
Position is 47.00%.
Comparative example 3
Weigh granularity for being 0.5 less than 1mm low-grade iron ore 4kg, C/Fe ratio, use in Rotary tube furnace charge preheating temperature from
200 DEG C of heating-up times being increased to 950 DEG C are 35min, 920 DEG C of reduction roasting 25min；Reduction roasting ore deposit through ball milling 20min,
Ore milling concentration is 50%, and magnetic field intensity is 1.4KA/m magnetic separation；The response rate obtaining result magnetic separation of iron ore concentrate is 83.77%, essence
Ore deposit grade is 47.63%.
Comparative example 4
Granularity is to become the agglomerate of 10mm less than briquetting after the NaCl of 1mm low-grade iron ore interpolation 3%, weighs 4kg, C/Fe after drying
Ratio is 0.5, and using charge preheating temperature in Rotary tube furnace is 35min from the heating-up time that 200 DEG C are increased to 950 DEG C, and 920 DEG C also
Former roasting 25min；Reduction roasting ore deposit is 50% through ball milling 20min, ore milling concentration, and magnetic field intensity is 1.4KA/m magnetic separation；?
The response rate to result magnetic separation of iron ore concentrate is 49.89%, and concentrate grade is 62.50%.
Comparative example 5
Coal blending and additive granulation coal base middle temperature fast restore-magnetic selection method in low-grade iron ore, low-grade iron ore and coal are preprocessed
Mass percent less than 0.074mm is 71.41% afterwards, and interior coal blending C/Fe ratio is 0, additive NaCl accounts for iron mine percent mass
Than being 3.0% to account for bentonite that the raw material that iron mine mass percent is 1.5% carries out mixing, disk pelletizing becomes a diameter of 3～8mm
Bead；Granulation bead is dried, and in employing Rotary tube furnace, charge preheating temperature from the heating-up time that 200 DEG C are increased to 950 DEG C is
35min, 950 DEG C of reduction roasting 25min；Reduction roasting ore deposit is 50% through ball milling 20min, ore milling concentration, and magnetic field intensity is 1.8
KA/m magnetic separation；The response rate obtaining result magnetic separation of iron ore concentrate is 23.86%, and concentrate grade is 59.81%.
Comparative example 6
Coal blending and additive granulation coal base middle temperature fast restore-magnetic selection method in low-grade iron ore, low-grade iron ore and coal are preprocessed
Mass percent less than 0.074mm is 71.41% afterwards, and interior coal blending C/Fe ratio is 0.4, additive NaCl accounts for iron mine quality hundred
Proportion by subtraction is 0% to account for bentonite that the raw material that iron mine mass percent is 1.5% carries out mixing, disk pelletizing becomes a diameter of 3～8mm
Bead；Granulation bead is dried, and in employing Rotary tube furnace, charge preheating temperature from the heating-up time that 200 DEG C are increased to 950 DEG C is
35min, 950 DEG C of reduction roasting 25min；Reduction roasting ore deposit is 50% through ball milling 20min, ore milling concentration, and magnetic field intensity is 1.8
KA/m magnetic separation；The response rate obtaining result magnetic separation of iron ore concentrate is 72.52%, and concentrate grade is 52.42%.
Comparative example 7
Coal blending and additive granulation coal base middle temperature fast restore-magnetic selection method in low-grade iron ore, low-grade iron ore and coal are preprocessed
Mass percent less than 0.074mm is 71.41% afterwards, and interior coal blending C/Fe ratio is 0.4, additive NaCl accounts for iron mine quality hundred
Proportion by subtraction is 3% to account for bentonite that the raw material that iron mine mass percent is 1.5% carries out mixing, disk pelletizing becomes a diameter of 3～8mm
Bead；Granulation bead is dried, and in employing Rotary tube furnace, charge preheating temperature from the heating-up time that 200 DEG C are increased to 950 DEG C is
During 80min, then 950 DEG C of reduction roasting 25min；Reduction roasting ore deposit is 50% through ball milling 20min, ore milling concentration, and magnetic field is strong
Degree is 1.8KA/m magnetic separation；The response rate obtaining result magnetic separation of iron ore concentrate is 69.49%, and concentrate grade is 61.45%.
Embodiment 1
Coal blending and additive granulation coal base middle temperature fast restore-magnetic selection method in low-grade iron ore, low-grade iron ore and coal are preprocessed
Mass percent less than 0.074mm is 52.32% afterwards, and interior coal blending C/Fe ratio is 0.3, additive NaCl accounts for iron mine quality hundred
Proportion by subtraction is 3.0% to account for bentonite that the raw material that iron mine mass percent is 1.5% carries out mixing, disk pelletizing becomes a diameter of 3～8mm
Bead；Granulation bead is dried, and in employing Rotary tube furnace, charge preheating temperature from the heating-up time that 200 DEG C are increased to 920 DEG C is
35min；Use 920 DEG C of reduction roasting 20min of Rotary tube furnace；Reduction roasting ore deposit is 50% through ball milling 20min, ore milling concentration,
Magnetic field intensity is 1.8KA/m magnetic separation；The response rate obtaining result magnetic separation of iron ore concentrate is 62.54%, and concentrate grade is 72.50%.
Embodiment 2
Coal blending and additive granulation coal base middle temperature fast restore-magnetic selection method in low-grade iron ore, low-grade iron ore and coal are preprocessed
Mass percent less than 0.074mm is 65.01% afterwards, and interior coal blending C/Fe ratio is 0.4, additive NaCl accounts for iron mine quality hundred
Proportion by subtraction is 3.0% to account for bentonite that the raw material that iron mine mass percent is 1.5% carries out mixing, disk pelletizing becomes a diameter of 3～8mm
Bead；Granulation bead is dried, and in employing Rotary tube furnace, charge preheating temperature from the heating-up time that 200 DEG C are increased to 950 DEG C is
35min；Use 950 DEG C of reduction roasting 20min of Rotary tube furnace；Reduction roasting ore deposit is 50% through ball milling 20min, ore milling concentration,
Magnetic field intensity is 1.8KA/m magnetic separation；The response rate obtaining result magnetic separation of iron ore concentrate is 70.21%, and concentrate grade is 74.43%.
Embodiment 3
Coal blending and additive granulation coal base middle temperature fast restore-magnetic selection method in low-grade iron ore, low-grade iron ore and coal are preprocessed
Mass percent less than 0.074mm is 71.41% afterwards, and interior coal blending C/Fe ratio is 0.4, additive NaCl accounts for iron mine quality hundred
Proportion by subtraction is 3.0% to account for bentonite that the raw material that iron mine mass percent is 1.5% carries out mixing, disk pelletizing becomes a diameter of 3～8mm
Bead；Granulation bead is dried, and in employing Rotary tube furnace, charge preheating temperature from the heating-up time that 200 DEG C are increased to 950 DEG C is
35min；Use 950 DEG C of reduction roasting 10min of Rotary tube furnace；Reduction roasting ore deposit is 50% through ball milling 20min, ore milling concentration,
Magnetic field intensity is 1.8KA/m magnetic separation；The response rate obtaining result magnetic separation of iron ore concentrate is 68.62%, and concentrate grade is 71.37%.
Embodiment 4
Coal blending and additive granulation coal base middle temperature fast restore-magnetic selection method in low-grade iron ore, low-grade iron ore and coal are preprocessed
Mass percent less than 0.074mm is 71.41% afterwards, and interior coal blending C/Fe ratio is 0.4, additive NaCl accounts for iron mine quality hundred
Proportion by subtraction is 3.0% to account for bentonite that the raw material that iron mine mass percent is 1.5% carries out mixing, disk pelletizing becomes a diameter of 3～8mm
Bead；Granulation bead is dried, and in employing Rotary tube furnace, charge preheating temperature from the heating-up time that 200 DEG C are increased to 950 DEG C is
35min；Use 950 DEG C of reduction roasting 25min of Rotary tube furnace；Reduction roasting ore deposit is 50% through ball milling 20min, ore milling concentration,
Magnetic field intensity is 1.8KA/m magnetic separation；The response rate obtaining result magnetic separation of iron ore concentrate is 75.24%, and concentrate grade is 72.18%.
Embodiment 5
Coal blending and additive granulation coal base middle temperature fast restore-magnetic selection method in low-grade iron ore, low-grade iron ore and coal are preprocessed
Mass percent less than 0.074mm is 71.41% afterwards, and interior coal blending C/Fe ratio is 0.2, additive NaCl accounts for iron mine quality hundred
Proportion by subtraction is 3.0% to account for bentonite that the raw material that iron mine mass percent is 1.5% carries out mixing, disk pelletizing becomes a diameter of 3～8mm
Bead；Granulation bead is dried, and in employing Rotary tube furnace, charge preheating temperature from the heating-up time that 200 DEG C are increased to 920 DEG C is
35min；Use 920 DEG C of reduction roasting 25min of Rotary tube furnace；Reduction roasting ore deposit is 50% through ball milling 20min, ore milling concentration,
Magnetic field intensity is 1.8KA/m magnetic separation；The response rate obtaining result magnetic separation of iron ore concentrate is 66.41%, and concentrate grade is 67.49%.
Embodiment 6
Coal blending and additive granulation coal base middle temperature fast restore-magnetic selection method in low-grade iron ore, low-grade iron ore and coal are preprocessed
Mass percent less than 0.074mm is 71.41% afterwards, and interior coal blending C/Fe ratio is 0.4, additive NaCl accounts for iron mine quality hundred
Proportion by subtraction is 2.0% to account for bentonite that the raw material that iron mine mass percent is 1.5% carries out mixing, disk pelletizing becomes a diameter of 3～8mm
Bead；Granulation bead is dried, and in employing Rotary tube furnace, charge preheating temperature from the heating-up time that 200 DEG C are increased to 950 DEG C is
35min；Use 950 DEG C of reduction roasting 25min of Rotary tube furnace；Reduction roasting ore deposit is 50% through ball milling 20min, ore milling concentration,
Magnetic field intensity is 1.8KA/m magnetic separation；The response rate obtaining result magnetic separation of iron ore concentrate is 71.11%, and concentrate grade is 68.01%.
Embodiment 7
Coal blending and additive granulation coal base middle temperature fast restore-magnetic selection method in low-grade iron ore, low-grade iron ore and coal are preprocessed
Mass percent less than 0.074mm is 71.41% afterwards, and interior coal blending C/Fe ratio is 0.2, additive NaCl accounts for iron mine quality hundred
Proportion by subtraction is 4.0% to account for bentonite that the raw material that iron mine mass percent is 1.5% carries out mixing, disk pelletizing becomes a diameter of 3～8mm
Bead；Granulation bead is dried, and in employing Rotary tube furnace, charge preheating temperature from the heating-up time that 200 DEG C are increased to 950 DEG C is
35min；Use 950 DEG C of reduction roasting 25min of Rotary tube furnace；Reduction roasting ore deposit is 50% through ball milling 20min, ore milling concentration,
Magnetic field intensity is 1.8KA/m magnetic separation；The response rate obtaining result magnetic separation of iron ore concentrate is 69.13%, and concentrate grade is 74.57%.
Embodiment 8
Coal blending and additive granulation coal base middle temperature fast restore-magnetic selection method in low-grade iron ore, low-grade iron ore and coal are preprocessed
Mass percent less than 0.074mm is 71.41% afterwards, and interior coal blending C/Fe ratio is 0.3, additive Na2CO3Account for iron mine quality hundred
Proportion by subtraction is 3.0% to account for bentonite that the raw material that iron mine mass percent is 1.5% carries out mixing, disk pelletizing becomes a diameter of 3～8mm
Bead；Granulation bead is dried, and in employing Rotary tube furnace, charge preheating temperature from the heating-up time that 200 DEG C are increased to 950 DEG C is
35min；Use 950 DEG C of reduction roasting 25min of Rotary tube furnace；Reduction roasting ore deposit is 50% through ball milling 20min, ore milling concentration,
Magnetic field intensity is 1.8KA/m magnetic separation；The response rate obtaining result magnetic separation of iron ore concentrate is 70.13%, and concentrate grade is 68.09%.
Embodiment 9
Coal blending and additive granulation coal base middle temperature fast restore-magnetic selection method in low-grade iron ore, low-grade iron ore and coal are preprocessed
Mass percent less than 0.074mm is 71.41% afterwards, and interior coal blending C/Fe ratio is 0.4, additive NaCl accounts for iron mine quality hundred
Proportion by subtraction is 3.0% to account for bentonite that the raw material that iron mine mass percent is 1.5% carries out mixing, disk pelletizing becomes a diameter of 3～8mm
Bead；Granulation bead is dried, and in employing Rotary tube furnace, charge preheating temperature from the heating-up time that 200 DEG C are increased to 950 DEG C is
25min；Use 950 DEG C of reduction roasting 25min of Rotary tube furnace；Reduction roasting ore deposit is 50% through ball milling 20min, ore milling concentration,
Magnetic field intensity is 1.8KA/m magnetic separation；The response rate obtaining result magnetic separation of iron ore concentrate is 74.65%, and concentrate grade is 71.89%.
Embodiment 10
Coal blending and additive granulation coal base middle temperature fast restore-magnetic selection method in low-grade iron ore, low-grade iron ore and coal are preprocessed
Mass percent less than 0.074mm is 71.41% afterwards, and interior coal blending C/Fe ratio is 0.4, additive NaCl accounts for iron mine quality hundred
Proportion by subtraction is 3.0% to account for bentonite that the raw material that iron mine mass percent is 1.5% carries out mixing, disk pelletizing becomes a diameter of 3～8mm
Bead；Granulation bead is dried, and in employing Rotary tube furnace, charge preheating temperature from the heating-up time that 200 DEG C are increased to 950 DEG C is
50min；Use 950 DEG C of reduction roasting 25min of Rotary tube furnace；Reduction roasting ore deposit is 50% through ball milling 20min, ore milling concentration,
Magnetic field intensity is 1.8KA/m magnetic separation；The response rate obtaining result magnetic separation of iron ore concentrate is 68.45%, and concentrate grade is 68.78%.
Claims (8)
1. the method that a low-grade iron ore is upgrade, it is characterised in that include following preparation process:
(1) low-grade iron ore and coal are carried out respectively pretreatment and accounts for the most total matter to they granularities less than the grade quality of 0.074mm
Amount more than 50%；
(2) through the good iron mine of (1) step pretreatment and coal be 0.2～0.5 by C/Fe mass ratio, and add account for iron mine quality 2.0%～
NaCl or Na of 4.0%2CO3Additive, and use the clay mineral that carries of low-grade iron ore to account for iron mine as binding agent or interpolation
The 0.5% of quality～the bentonite of 2.0% carry out dispensing as binding agent；Dispensing is mixed into compound after adding water-wet；By compound
It is granulation into the granulation bead of a diameter of 3～8mm；
(3) the granulation bead (2) step obtained is dried, carries out coal base middle temperature fast restore, i.e. first by advance in rotary kiln
Hot warming temperature 200 DEG C is increased to 920 DEG C, and the time is 25min～50min, then at 920 DEG C～950 DEG C of reduction roasting 10min～
25min makes reducing material, and the cooling drums isolation air that reducing material is sprayed water by outside is cooled to 90 DEG C～110 DEG C, adopts after cooling
With dry magnetic separation isolated reduction roasting bead and carbon residue, carbon residue returns coal-based rotary kiln and uses；
(4) the reduction roasting little ball warp ore grinding obtained by (3) step, magnetic separation are obtained the iron ore concentrate upgrade.
The method that a kind of low-grade iron ore the most according to claim 1 is upgrade, it is characterised in that institute in step (1)
The pretreatment stated is that ore grinding, profit mill or high pressure roller mill process.
The method that a kind of low-grade iron ore the most according to claim 1 is upgrade, it is characterised in that institute in step (1)
The coal stated is to have brown coal, anthracite or the biomass carbon that fugitive constituent more than 25% reactivity is high.
The method that a kind of low-grade iron ore the most according to claim 1 is upgrade, it is characterised in that mixed in step (2)
Closing material uses disc balling machine or pelletising drum to pelletize, and the moisture of the granulation bead obtained is 7%～11%.
The method that a kind of low-grade iron ore the most according to claim 1 is upgrade, it is characterised in that
In step (3), granulation bead uses drum drier to be dried.
The method that a kind of low-grade iron ore the most according to claim 5 is upgrade, it is characterised in that doing of granulation bead
Should meet after dry by the value of quality 0.5kg make its at a height of 0.5m after group 3 times less than 1.0mm pulverization rate less than 5%
Condition.
The method that a kind of low-grade iron ore the most according to claim 1 is upgrade, it is characterised in that
The process that is dried granulation bead described in above-mentioned steps (3) is the part thermal reduction utilizing rotary kiln reduction section out
Gas burning gases again are dried process to granulation bead, and remaining hot waste gas carries out heat exchange and becomes preheated air to use as rotary kiln burning
Air or use other UTILIZATION OF VESIDUAL HEAT IN measure to reclaim.
The method that a kind of low-grade iron ore the most according to claim 1 and 2 is upgrade, is characterized in that: in step (4)
Little ball warp 10min of reduction roasting～20min ore grinding after cooling, the grinding particle size mass content less than 0.074mm is more than 95%, magnetic
When selecting, magnetic field intensity is 1.4～2.0KA/m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410200461.3A CN103993166B (en) | 2014-05-13 | 2014-05-13 | A kind of method that low-grade iron ore is upgrade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410200461.3A CN103993166B (en) | 2014-05-13 | 2014-05-13 | A kind of method that low-grade iron ore is upgrade |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103993166A CN103993166A (en) | 2014-08-20 |
| CN103993166B true CN103993166B (en) | 2016-09-28 |
Family
ID=51307492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410200461.3A Active CN103993166B (en) | 2014-05-13 | 2014-05-13 | A kind of method that low-grade iron ore is upgrade |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103993166B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104862440A (en) * | 2015-03-19 | 2015-08-26 | 中南大学 | Low-grade iron ore direct reduction method |
| CN106119456A (en) * | 2016-08-01 | 2016-11-16 | 江苏省冶金设计院有限公司 | Prepare the method and system of ferrum |
| CN106591572A (en) * | 2017-01-06 | 2017-04-26 | 中南大学 | Method for reinforcing preparation and reduction of carbon-containing pellets in iron ore |
| CN108690909A (en) * | 2017-04-05 | 2018-10-23 | 祁东县顺达矿业有限公司 | The method that kiln is tied in preventing rotary kiln from producing |
| CN108374066B (en) * | 2018-03-30 | 2019-07-16 | 唐竹胜 | A kind of method of the biradical association type low temperature fast deep direct reduced iron of the double kilns of powdery iron ore |
| CN111809044A (en) * | 2020-07-27 | 2020-10-23 | 北京科技大学 | Multi-source complex low-grade iron ore resource utilization method and high-quality composite iron-making furnace burden |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5496526A (en) * | 1993-08-30 | 1996-03-05 | The United States Of America As Represented By The Secretary Of The Interior | Production of intermediate grade manganese concentrate from low grade manganiferous ores |
| CN103305650A (en) * | 2013-06-25 | 2013-09-18 | 中南大学 | Efficient comprehensive utilization method of siderite resource |
| CN103468936A (en) * | 2013-08-15 | 2013-12-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Difficult-separation iron ore tailing pelletizing rotary kiln magnetic roasting treatment technology |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102277485A (en) * | 2011-08-09 | 2011-12-14 | 中南大学 | Method for extracting nonferrous metals by processing low-content nonferrous metal material |
-
2014
- 2014-05-13 CN CN201410200461.3A patent/CN103993166B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5496526A (en) * | 1993-08-30 | 1996-03-05 | The United States Of America As Represented By The Secretary Of The Interior | Production of intermediate grade manganese concentrate from low grade manganiferous ores |
| CN103305650A (en) * | 2013-06-25 | 2013-09-18 | 中南大学 | Efficient comprehensive utilization method of siderite resource |
| CN103468936A (en) * | 2013-08-15 | 2013-12-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Difficult-separation iron ore tailing pelletizing rotary kiln magnetic roasting treatment technology |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103993166A (en) | 2014-08-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103993166B (en) | A kind of method that low-grade iron ore is upgrade | |
| CN100552057C (en) | The cold fixed molten production method of dividing of the direct electric reduction furnace of charcoal pelletizing that contains of vanadium titano-magnetite | |
| CN104862440A (en) | Low-grade iron ore direct reduction method | |
| CN102242259B (en) | Preparation process of low-grade laterite nickel ore oxidized pellet | |
| CN103667686B (en) | A kind of sinter mixture and application | |
| CN101418389B (en) | Method for directly reducing grain nickel iron in rotary kiln by using laterite nickle mine | |
| CN102634621A (en) | Device and method for treating refractory iron ore | |
| CN101879599B (en) | Method for preparing reductive iron powder and high-purity refined iron powder by using iron ores | |
| CN104630475A (en) | Method for producing ferrochrome | |
| CN103103347B (en) | Method for preparing blast furnace ironmaking burden from full-vanadium titanium magnetite concentrate | |
| CN101418388B (en) | Process for producing nickel iron in rotary kiln-blast furnace by using laterite nickle mine | |
| CN104212931B (en) | A kind of method utilizing rotary kiln drastic reduction to produce metal iron powder | |
| CN104531983B (en) | Method used for preparing pellet ore from fluorine-containing mixed iron concentrate | |
| Zhu et al. | Co-benefits of CO2 emission reduction and sintering performance improvement of limonitic laterite via hot exhaust-gas recirculation sintering | |
| CN105063347A (en) | Method for producing pellets with discarded calcium magnesium bricks | |
| CN105907990A (en) | Method of producing ferrocolumbium | |
| Tian et al. | Effective and economical treatment of low-grade nickel laterite by a duplex process of direct reduction-magnetic separation & rotary kiln-electric furnace and its industrial application | |
| CN111100981B (en) | Method for improving metallurgical performance of manganese-rich slag smelted manganese sinter | |
| Abdul et al. | Analysis the effect of charcoal mass variation to Ni content, sinter strength and yield on sintering process of limonitic laterite nickel ore | |
| Jiang et al. | Efficient preparation of blast furnace burdens from titanomagnetite concentrate by composite agglomeration process | |
| CN105838839B (en) | It prepares the method for granulated iron and prepares the system of granulated iron | |
| CN101538626A (en) | Method for directly producing nickel-bearing pig iron in rotary kilns by using laterite-nickel | |
| CN105219954A (en) | A kind of recoverying and utilizing method of dedusting ash of stainless steel | |
| He et al. | Characteristics evaluation and high effective utilization of limonite ores in sintering process | |
| CN103757165B (en) | A kind of high-iron bauxite blast-furnace smelting has valency constituent element method of comprehensive utilization |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: QIDONG SHUNDA MINING CO., LTD. Effective date: 20140905 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20140905 Address after: Yuelu District City, Hunan province 410083 Changsha Lushan Road No. 932 Applicant after: Central South University Applicant after: Qidong Shunda Mining Co., Ltd. Address before: Yuelu District City, Hunan province 410083 Changsha Lushan Road No. 932 Applicant before: Central South University |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210316 Address after: Yuelu District City, Hunan province 410083 Changsha Lushan Road No. 932 Patentee after: CENTRAL SOUTH University Patentee after: QIDONG SHUNDA MINING Co.,Ltd. Patentee after: Hunan bangchao New Material Technology Co.,Ltd. Address before: Yuelu District City, Hunan province 410083 Changsha Lushan Road No. 932 Patentee before: CENTRAL SOUTH University Patentee before: QIDONG SHUNDA MINING Co.,Ltd. |
|
| TR01 | Transfer of patent right |