CN106011460B - A kind of method that sintering deposit is prepared using iron concentrate containing high sulphur - Google Patents
A kind of method that sintering deposit is prepared using iron concentrate containing high sulphur Download PDFInfo
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- CN106011460B CN106011460B CN201610560148.XA CN201610560148A CN106011460B CN 106011460 B CN106011460 B CN 106011460B CN 201610560148 A CN201610560148 A CN 201610560148A CN 106011460 B CN106011460 B CN 106011460B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
- C22B1/22—Sintering; Agglomerating in other sintering apparatus
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
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Abstract
The invention discloses a kind of method that sintering deposit is prepared using iron concentrate containing high sulphur, it comprises the following steps：(1) it is 94~100 in mass ratio by iron concentrate containing high sulphur and coal dust：After 0~6 is well mixed, obtained compound is placed in return bend, and it is 700~800 DEG C to control temperature, reacts 10~35min；(2) when obtained reactant will be handled through step (1) and being ground to reactant of the granularity less than 0.074mm and account for more than the 80% of total reactant quality, stop milled processed, obtain iron concentrate containing high sulphur first product；(3) obtained iron concentrate containing high sulphur is sintered according to the processing mode of sintering deposit, obtains sintering deposit.The efficiency high of the method desulfurization of the present invention, combined using pretreatment and utilize iron concentrate containing high sulphur at sintering, desulfuration efficiency is up to more than 90%；And the desulfurization process cost of the present invention is low, iron concentrate grade is influenceed small.
Description
Technical field
The present invention relates to a kind of field of steel metallurgy, and in particular to a kind of side that sintering deposit is prepared using iron concentrate containing high sulphur
Method.
Background technology
Sulphur can make steel produce red brittleness, steel is produced fracture, therefore sulfur content one in steel when forging and roll at high temperature
As must not exceed 0.05%, this require steel-making iron ore concentrate in sulfur content can not be too high.
High sulfide pyrite is distributed that wide, stock number is big in China, but because it contains higher sulphur, can have a strong impact on iron
Water quality, increase subsequent treatment cost, many iron and steel enterprises all have to the more expensive low-sulfur iron ore of purchasing price, make high sulfide pyrite
Become " chicken ribs " in many areas, it is imperative to the low vulcanizing treatment of high sulfide pyrite.
Chinese patent application CN201110179774.1 " high sulfide pyrite pellet reinforced roasting consolidation technology " is disclosed height
Sulphur iron ore concentrate is used for pelletizing production, and the technique not only needs to transform original grate kiln technique, extends drying grate
Length is used for desulfurization, and needs to changing more high temperature resistant rotary kiln burner and refractory material, so that kiln body adapts to be higher than
The decomposition that the sintering temperature of common ore deposit is used for sulfate carries out desulfurization.Therefore, high iron concentrate is used for ball by the method for prior art
Nodulizing production will guarantee to produce qualified pellet, and required cost is raised compared with using common concentrate.
For iron and steel enterprise, cheap, aboundresources iron ore is very good raw material, if high-sulfur ore deposit can be solved
The problem of sulfur-bearing is high, then high-sulfur ore deposit will also turn into a kind of desirable feedstock.
The content of the invention
[technical problems to be solved]
Present invention aim to address above-mentioned prior art problem, there is provided a kind of to prepare sintering deposit using iron concentrate containing high sulphur
Method.
[technical scheme]
In order to reach above-mentioned technique effect, the present invention takes following technical scheme：
Sulphur in high sulfide pyrite mainly exists in the form of ferrous sulfide (FeS), under 700 DEG C of ＞ oxidative conditions,
FeS is easily decomposed to form SO2And Fe3+, SO2Volatilized by flue gas, can so substantially reduce the sulfur content in high sulfide pyrite,
Iron ore concentrate after by pretreatment is sintered, the high-sulfur iron essence that obtained sintering deposit more directly uses not pre-processed
Ore deposit is low more of sintering deposit of raw material production.
A kind of method that sintering deposit is prepared using iron concentrate containing high sulphur, it comprises the following steps：
(1) it is 94~100 in mass ratio by iron concentrate containing high sulphur and coal dust：After 0~6 is well mixed, obtained compound is put
In return bend, it is 700~800 DEG C to control temperature, reacts 10~35min；
(2) reactant that will be obtained through step (1) processing is ground to reactant of the granularity less than 0.074mm and accounts for total reactant
Quality more than 80% when, stop milled processed, obtain iron concentrate containing high sulphur first product；
(3) obtained iron concentrate containing high sulphur is sintered according to the processing mode of sintering deposit, obtains sintering deposit.
According to the further technical scheme of the present invention, in step (1), described be well mixed refers to iron concentrate containing high sulphur
After being mixed in proportion with coal dust, it is put into cylindrical mixer and 5~8min is mixed with 8~12rpm rotating speed.
According to the further technical scheme of the present invention, in step (2), described grinding is that 10 are ground in ball mill
~20min.
It is described to refer to according to the processing mode of sintering deposit in step (3) according to the further technical scheme of the present invention
By iron concentrate containing high sulphur first product, middle grade fine ore, high-grade fine ore, lime stone, activity ash, coke powder according to mass ratio be 60~62：4
~5：16~18：7~9：4~5：After 4~5 is well mixed, control compound reclaimed water is divided into 7%；Then secondary mixing is carried out, is controlled
Mixture moisture processed is 7.5%；After mixing, obtained compound is placed in sintered cup, firing temperature be 1100~
1200 DEG C, the condition that the duration of ignition is 1.5~3min, igniting negative pressure is 6.5~7kPa, sintering suction pressure is 14~15kPa
Under carry out igniting sintering, obtain sintering deposit.
According to a preferred embodiment of the invention, the iron concentrate containing high sulphur first product, middle grade fine ore, high-grade powder
Ore deposit, lime stone, activity ash, coke powder are 62 according to mass ratio：4：17：7：5：5.
According to a preferred embodiment of the invention, the reaction condition of the igniting sintering is that firing temperature is 1150
DEG C, duration of ignition 2.5min, igniting negative pressure be 7kPa, sintering suction pressure be 15kPa.
According to the further technical scheme of the present invention, the middle grade fine ore include following weight/mass percentage composition into
Point：53.5~54.0% TFe, 17.0~18.0% SiO2, 2.0~3.0% CaO, 0.05~0.10% S；It is described
Middle grade fine ore of the granularity less than 3mm accounts for more than the 90% of total middle grade fine ore quality in middle grade fine ore.
According to the further technical scheme of the present invention, the high-grade fine ore include following weight/mass percentage composition into
Point：58.5~59.5% TFe, more than 20% FeO, 8.0~9.0% SiO2, 2.5~3.0% CaO, less than 0.5%
S；Middle grade fine ore of the granularity less than 0.074mm accounts for more than the 80% of total middle grade fine ore quality in the middle grade fine ore.
The present invention is will be described in detail below.
Sulphur in high sulfide pyrite is mainly present in iron ore concentrate in the form of ferrous sulfide (FeS), by iron concentrate containing high sulphur
Calcination process, under 700~800 DEG C of sintering temperature, most FeS meetings and O are carried out beforehand through with coal blending2Reaction life
Into SO2, and Fe2+Fe can be become3+, the purpose for being incorporated coal dust is to improve reaction temperature, accelerates reaction to carry out, the flue gas of enrichment is connect
Enter desulphurization plant, can be used as common iron ore concentrate by the high iron concentrate after processing is sintered.
The present invention i.e. at 700~800 DEG C, is placed in return bend after reacting 10~35min, grinding obtains by pretreatment
Iron concentrate containing high sulphur first product include the composition of following weight/mass percentage composition：53.5~54.0% TFe, more than 30% FeO,
3.5~4.0% SiO2, 0.9~1.0% CaO, 0.05~0.10% S；Granularity is less than in the middle grade fine ore
0.074mm middle grade fine ore accounts for more than the 80% of total middle grade fine ore quality.The quality of ash content in the coal dust that the present invention uses
Percentage composition is 12~15%, CGuWeight/mass percentage composition be more than 70%；The granularity of the coal dust is less than 3mm.Wherein, it is described
TFe be Fe total amount.
In the preparation process of the present invention, by the adjustment to return bend rotating speed and inclination angle, compound can be controlled to turn round
Residence time, roasting time in pipe.
In the preparation process of the present invention, the flue gas for being calcined to obtain in return bend can be collected processing, to avoid SO2
Pollution to environment.
Pretreatment in the present invention need not add desulfurizing agent, it is only necessary to add a small amount of coal dust, processing cost is low, at 400 DEG C
The volatile matter during above in coal dust is left by flue gas, the grade of iron ore concentrate is influenceed small.
[beneficial effect]
The present invention compared with prior art, has following beneficial effect：
The present invention can by iron concentrate containing high sulphur by the method removing that pre-processes, re-sinter in itself more than 90% sulfur-bearing
Amount, make to reach the sintering deposit produced by raw material of common iron ore concentrate using the sintering deposit sulfur content that iron concentrate containing high sulphur is raw material production
Level.
The efficiency high of the method desulfurization of the present invention, combined using pretreatment and utilize iron concentrate containing high sulphur, desulfuration efficiency at sintering
Up to more than 90%；And the desulfurization process cost of the present invention is low, iron concentrate grade is influenceed small.
Embodiment
With reference to embodiments of the invention, the invention will be further elaborated.
ω is expressed as weight/mass percentage composition in following embodiments, and R is the basicity of sintering deposit；Equipment needed for following embodiments
Parameter is as follows：
Cylindrical mixer --- specification is2m is about, rotating speed and mixing time are adjustable；
Return bend --- specification is7m, rotating speed, tilt adjustable are about, maximum temperature is more than 800 DEG C；
Sintered cup --- specification isHigh about 800mm.
Embodiment 1：
By the coal dust of the iron concentrate containing high sulphur of percentage by weight 95% and percentage by weight 5% above-mentioned cylindrical mixer with
10rpm rotating speeds are mixed, mixing time 5min, then compound is placed in above-mentioned return bend, control return bend temperature 800
DEG C, by controlling roasting time 10min of the compound in return bend to rotating speed and tilt adjustment, then the essence finished will be calcined
Ore deposit is placed in ball mill and is ground, and iron concentrate containing high sulphur first product ω (granularity is less than 0.074mm) ＞ 80% is poured out after making grinding, root
According to iron concentrate containing high sulphur first product, middle grade fine ore, high-grade fine ore, lime stone, activity ash, coke powder according to mass ratio be 62：4：17：
7：5：5 sintered materials, justify for compound in logical batch mixer and mix, it is 7.0% to control the moisture in compound, and incorporation time is
4min, then secondary mixing will be carried out by the material mixed, it is 7.5% to control mixture moisture, the compound that mixing is completed
(3Kg grate-layer materials sintering deposit first cloth in sintered cup bottom, thickness about 25~35mm) is placed in sintered cup, and thickness of feed layer is
600mm, and binder peace material all in one piece face, set firing temperature as 1150 DEG C, and duration of ignition 2.5min, igniting negative pressure is 7kPa,
Sintering suction pressure is 15kPa, carries out igniting sintering.
Sintering deposit is cooled to less than 300 DEG C after terminating and carried out after just breaking by 40~25mm, 25~16mm, 16 by sintering process
~10mm, 10~5mm, ＜ 5mm are sieved respectively, finally calculate the ratio (yield rate) shared by granularity ＞ 5mm sintering deposit,
And according to national standard GB3209 canonical measure sintered ore rotary drum strengths.
The analysis result for the sintering deposit that the present embodiment obtains is as follows：It is that 1.84, TFe grades are 49.1% to obtain R, sulfur content
0.036% sintering deposit, its tumbler index are 73.18%, and sintering finished rate is 78.68%.
Embodiment 2
By the coal dust of the iron concentrate containing high sulphur of percentage by weight 98% and percentage by weight 2% above-mentioned cylindrical mixer with
10rpm rotating speeds are mixed, mixing time 5min, then compound is placed in above-mentioned return bend, control return bend temperature 800
DEG C, by controlling roasting time 10min of the compound in return bend to rotating speed and tilt adjustment, then the essence finished will be calcined
Ore deposit is placed in ball mill and is ground, and iron concentrate containing high sulphur first product ω (granularity is less than 0.074mm) ＞ 80% is poured out after making grinding, root
According to iron concentrate containing high sulphur first product, middle grade fine ore, high-grade fine ore, lime stone, activity ash, coke powder according to mass ratio be 61：5：16：
8：5：5 sintered materials, justify for compound in logical batch mixer and mix, it is 7.0% to control the moisture in compound, incorporation time
For 4min, then secondary mixing will be carried out by the material mixed, it is 7.5% control mixture moisture, will mix the mixing of completion
Material is placed in sintered cup (3Kg grate-layer materials sintering deposit first cloth in sintered cup bottom, thickness about 25~35mm), and thickness of feed layer is
600mm, and binder peace material all in one piece face, set firing temperature as 1130 DEG C, and duration of ignition 2.4min, igniting negative pressure is 7kPa,
Sintering suction pressure is 15kPa, carries out igniting sintering.
Sintering deposit is cooled to less than 300 DEG C after terminating and carried out after just breaking by 40~25mm, 25~16mm, 16 by sintering process
~10mm, 10~5mm, ＜ 5mm are sieved respectively, finally calculate the ratio (yield rate) shared by granularity ＞ 5mm sintering deposit,
And according to national standard GB3209 canonical measure sintered ore rotary drum strengths.
The analysis result for the sintering deposit that the present embodiment obtains is as follows：It is that 1.84, TFe grades are 49.1% to obtain R, sulfur content
0.063% sintering deposit, its tumbler index are 73.41%, and sintering finished rate is 78.57%.
Embodiment 3
The iron concentrate containing high sulphur of percentage by weight 100% is mixed in above-mentioned cylindrical mixer with 10rpm rotating speeds, mixed
Expect time 5min, then compound is placed in above-mentioned return bend, 800 DEG C of control return bend temperature, by rotating speed and inclination angle
Roasting time 30min of the adjustment control compound in return bend, then the concentrate that roasting finishes is placed in ball mill and carried out
Grinding, iron concentrate containing high sulphur first product ω (granularity is less than 0.074mm) ＞ 80% is poured out after making grinding, according to iron concentrate containing high sulphur first product,
Middle grade fine ore, high-grade fine ore, lime stone, activity ash, coke powder are 62 according to mass ratio：4：17：7：5：5 sintered materials, it is right
Justify in compound in logical batch mixer and mix, it is 7.0%, incorporation time 4min to control the moisture in compound, then will be through overmulling
Even material carries out secondary mixing, and it is 7.5% to control mixture moisture, and the compound for mixing completion is placed in sintered cup into (3Kg
Grate-layer material sintering deposit first cloth in sintered cup bottom, thickness about 25~35mm), thickness of feed layer 600mm, and binder peace material all in one piece
Face, firing temperature is set as 1150 DEG C, duration of ignition 2.5min, igniting negative pressure is 7kPa, and sintering suction pressure is 15kPa,
Carry out igniting sintering.
Sintering process terminate after by sintering deposit be cooled to less than 300 DEG C carry out it is just broken after by 40~25mm, 25~16mm,
16~10mm, 10~5mm, ＜ 5mm are sieved respectively, finally calculate the ratio (finished product shared by granularity ＞ 5mm sintering deposit
Rate), and according to national standard GB3209 canonical measure sintered ore rotary drum strengths.
The analysis result for the sintering deposit that the present embodiment obtains is as follows：It is that 1.84, TFe grades are 49.1% to obtain R, sulfur content
0.066% sintering deposit, its tumbler index are 73.28%, and sintering finished rate is 78.64%.
Embodiment 4
By the coal dust of the iron concentrate containing high sulphur of percentage by weight 98% and percentage by weight 2% above-mentioned cylindrical mixer with
10rpm rotating speeds are mixed, mixing time 5min, then compound is placed in above-mentioned return bend, control return bend temperature 800
DEG C, by controlling roasting time 30min of the compound in return bend to rotating speed and tilt adjustment, then the essence finished will be calcined
Ore deposit is placed in ball mill and is ground, and iron concentrate containing high sulphur first product ω (granularity is less than 0.074mm) ＞ 80% is poured out after making grinding, root
According to iron concentrate containing high sulphur first product, middle grade fine ore, high-grade fine ore, lime stone, activity ash, coke powder according to mass ratio be 62：4：17：
7：5：5 sintered materials, justify for compound in logical batch mixer and mix, it is 7.0% to control the moisture in compound, and incorporation time is
4min, then secondary mixing will be carried out by the material mixed, it is 7.5% to control mixture moisture, the compound that mixing is completed
(3Kg grate-layer materials sintering deposit first cloth in sintered cup bottom, thickness about 25~35mm) is placed in sintered cup, and thickness of feed layer is
600mm, and binder peace material all in one piece face, set firing temperature as 1150 DEG C, and duration of ignition 2.5min, igniting negative pressure is 7kPa,
Sintering suction pressure is 15kPa, carries out igniting sintering.
Sintering deposit is cooled to less than 300 DEG C after terminating and carried out after just breaking by 40~25mm, 25~16mm, 16 by sintering process
~10mm, 10~5mm, ＜ 5mm are sieved respectively, finally calculate the ratio (yield rate) shared by granularity ＞ 5mm sintering deposit,
And according to national standard GB3209 canonical measure sintered ore rotary drum strengths.
The analysis result for the sintering deposit that the present embodiment obtains is as follows：It is that 1.84, TFe grades are 49.1% to obtain R, sulfur content
0.065% sintering deposit, its tumbler index are 73.39%, and sintering finished rate is 78.56%.
Comparative example 1
It is according to mass ratio according to iron concentrate containing high sulphur, middle grade fine ore, high-grade fine ore, lime stone, activity ash, coke powder
62：4：17：7：5：5 sintered materials, justify for compound in logical batch mixer and mix, it is 7.0% to control the moisture in compound, is mixed
The conjunction time is 4min, then will carry out secondary mixing by the material mixed, and it is 7.5% to control mixture moisture, and mixing is completed
Compound be placed in sintered cup (3Kg grate-layer materials sintering deposit first cloth in sintered cup bottom, thickness about 25~35mm), the bed of material is thick
Spend for 600mm, and binder peace material all in one piece face, set firing temperature as 1150 DEG C, duration of ignition 2.5min, igniting negative pressure is
7kPa, sintering suction pressure are 15kPa, carry out igniting sintering.
Sintering deposit is cooled to less than 300 DEG C after terminating and carried out after just breaking by 40~25mm, 25~16mm, 16 by sintering process
~10mm, 10~5mm, ＜ 5mm are sieved respectively, finally calculate the ratio (yield rate) shared by granularity ＞ 5mm sintering deposit,
And according to national standard GB3209 canonical measure sintered ore rotary drum strengths.
The analysis result for the sintering deposit that the present embodiment obtains is as follows：It is that 1.84, TFe grades are 49.1% to obtain R, sulfur content
0.072% sintering deposit, its tumbler index are 73.24%, and sintering finished rate is 78.62%.
In summary, the sintering deposit sulfur content that preparation method of the invention is prepared is decreased obviously, and of the invention is de-
Sulphur efficiency is preferable, and the present invention does not add desulfurizing agent in the preprocessing process of desulfurization, it is only necessary to adds a small amount of coal dust, or is not added with
Enter coal dust, processing cost is low, and to the grade of iron ore concentrate under the influence of.
Although reference be made herein to invention has been described for explanatory embodiment of the invention, and above-described embodiment is only this hair
Bright preferable embodiment, embodiments of the present invention are simultaneously not restricted to the described embodiments, it should be appreciated that people in the art
Member can be designed that a lot of other modifications and embodiment, and these modifications and embodiment will fall in principle disclosed in the present application
Within scope and spirit.
Claims (3)
- A kind of 1. method that sintering deposit is prepared using iron concentrate containing high sulphur, it is characterised in that it comprises the following steps：(1) it is 94~100 in mass ratio by iron concentrate containing high sulphur and coal dust：After 0~6 is well mixed, obtained compound is placed in back In tube, it is 700~800 DEG C to control temperature, reacts 10~35min；(2) reactant that will be obtained through step (1) processing is ground to reactant of the granularity less than 0.074mm and accounts for total reactant quality More than 80% when, stop milled processed, obtain iron concentrate containing high sulphur first product；(3) obtained iron concentrate containing high sulphur is sintered according to the processing mode of sintering deposit, obtains sintering deposit；In step (3), the processing mode according to sintering deposit refers to iron concentrate containing high sulphur first product, middle grade fine ore, Gao Pin Position fine ore, lime stone, activity ash, coke powder are 62 according to mass ratio：4：17：7：5：After 5 is well mixed, moisture in compound is controlled For 7%；Then secondary mixing is carried out, it is 7.5% to control mixture moisture；After mixing, obtained compound is placed in burning Tie cup in, firing temperature be 1150 DEG C, duration of ignition 2.5min, igniting negative pressure be 7kPa, sintering suction pressure be 15kPa Under conditions of carry out igniting sintering, obtain sintering deposit；The middle grade fine ore includes the composition of following weight/mass percentage composition：53.5~54.0% TFe, 17.0~18.0% SiO2, 2.0~3.0% CaO, 0.05~0.10% S；Granularity is less than 3mm middle grade fine ore in the middle grade fine ore Account for more than the 90% of total middle grade fine ore quality；The high-grade fine ore includes the composition of following weight/mass percentage composition：58.5~59.5% TFe, more than 20% FeO, 8.0~9.0% SiO2, 2.5~3.0% CaO, less than 0.5% S；Granularity is less than 0.074mm in the middle grade fine ore Middle grade fine ore account for it is total in grade fine ore quality more than 80%.
- 2. the method according to claim 1 that sintering deposit is prepared using iron concentrate containing high sulphur, it is characterised in that in step (1) In, it is described it is well mixed refer to after mixing iron concentrate containing high sulphur and coal dust in proportion, be put into cylindrical mixer with 8~ 12rpm rotating speed mixes 5~8min.
- 3. the method according to claim 1 that sintering deposit is prepared using iron concentrate containing high sulphur, it is characterised in that in step (2) In, described grinding is 10~20min of grinding in ball mill.
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| CN109517971A (en) * | 2018-11-06 | 2019-03-26 | 包头钢铁（集团）有限责任公司 | A method of reducing iron concentrate containing high sulphur sulfur content |
| CN111961786B (en) * | 2020-08-31 | 2022-03-08 | 长沙矿冶研究院有限责任公司 | Manganese-iron combined production method for strengthening pyrolusite reduction by using pyrite |
| CN114836616B (en) * | 2022-04-01 | 2023-12-29 | 山西太钢不锈钢股份有限公司 | Iron ore powder pellet and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101999004A (en) * | 2008-04-10 | 2011-03-30 | 新日本制铁株式会社 | Method for producing sintered ore |
| CN103966428A (en) * | 2014-05-21 | 2014-08-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for producing low-sulfur metallized pellets by high-sulfur iron ore concentrate |
| CN104531981A (en) * | 2014-11-21 | 2015-04-22 | 内蒙古包钢钢联股份有限公司 | Method used for preparing sintered ore from high sulfur iron concentrate |
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| JPS52145304A (en) * | 1976-05-29 | 1977-12-03 | Nippon Steel Corp | Decreasing of contaminated gas exhausted from sintering machine |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101999004A (en) * | 2008-04-10 | 2011-03-30 | 新日本制铁株式会社 | Method for producing sintered ore |
| CN103966428A (en) * | 2014-05-21 | 2014-08-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for producing low-sulfur metallized pellets by high-sulfur iron ore concentrate |
| CN104531981A (en) * | 2014-11-21 | 2015-04-22 | 内蒙古包钢钢联股份有限公司 | Method used for preparing sintered ore from high sulfur iron concentrate |
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