CN1916196B - Method for producing fine powder of magnetite from active iron ore - Google Patents
Method for producing fine powder of magnetite from active iron ore Download PDFInfo
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- CN1916196B CN1916196B CN200610095092A CN200610095092A CN1916196B CN 1916196 B CN1916196 B CN 1916196B CN 200610095092 A CN200610095092 A CN 200610095092A CN 200610095092 A CN200610095092 A CN 200610095092A CN 1916196 B CN1916196 B CN 1916196B
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- iron ore
- magnetite
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- active iron
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Abstract
This invention discloses a method for manufacturing magnetite concentrate from active iron ore. The method comprised: (1) pulverizing active iron ore, mixing with separation-deoxygenation promoter at a weight ratio of 1: (0.001-0.005), and placing the mixture in an earth kiln or suspended kiln; (2) uniformly heating to 550-850 deg.C to calcine the active iron ore, taking out milling in a ball mill to obtain iron ore slurry; (3) performing magnetic separation by a magnetic separator, precipitating, filtering and drying to obtain magnetite separator, precipitating, filtering and drying to obtain magnetite concentrate. The method has such advantages as low cost and simple process, and can obviously reduce the contents of harmful substances such as S, P, Zn, Na, Cu, Si, crystalline water, Hg and Mg, and increase iron content to higher than 62%. The obtained magnetite concentrate can satisfy corresponding state standards, and can be used to manufacture high-quality steel.
Description
(1), technical field
The present invention relates to a kind of preparation method's of powdered iron ore, particularly a kind of fine powder of magnetite method.
(2), background technology
As everyone knows, magnetite can be produced the fine steel, still, very shortage of the resource of magnetite at present, the basic demand that can not satisfy steelworks far away, therefore, use is produced magnetite at the profuse iron ore alive of Mineral Resources in China and is had very important economic implications.Existing method of producing magnetite with the iron ore of living is: select sulfur-bearing, raw ore that phosphorus is low for use, then original ore powder is broken into ore in sand form, be evenly to be stirred at 1: 1 ore in sand form by weight with fine powder of magnetite again, carry out machine burning after group's balling-up, after machine burning, be finished product.This method exists following deficiency: owing to contain objectionable impuritiess such as sulphur, phosphorus, zinc, sodium, copper, gold, silicon, crystal water, mercury, magnesium at least in the iron ore of living, existing method can not be removed these materials effectively, cause the magnetite of producing to satisfy the standard of country's promulgation at all, for example: iron-holder is lower than 62%, sulphur content is greater than 0.5%, and phosphorus content is greater than 0.3% etc.Make steel with the magnetite that existing method is produced, the steel of being produced is the production cost height not only, and too much can only can not produce the high-quality steel as common structural steel because of impurity at all.
(3), summary of the invention
Purpose of the present invention just provides a kind of method with producing fine powder of magnetite from active iron ore, this method can reduce content of harmful such as sulphur, phosphorus, zinc, sodium, copper, gold, silicon, crystal water, mercury, magnesium significantly, and make iron level be higher than 62%, make every index of fine powder of magnetite satisfy national standard fully.
The objective of the invention is to realize that by such technical scheme its step is as follows:
(1), the powdered iron ore of will living is broken into the bushel iron ore deposit;
(2), be the bushel iron ore deposit in the above-mentioned steps 1 by weight with separating deoxidation promotor: (1 ‰～5 ‰) ratio mixes; Described separation deoxidation promotor is made up of marble dust, plaster stone, nepheline powder, graphite, sodium-chlor, saltcake and unslaked lime, and their weight part is respectively:
Marble dust: 50-80, plaster stone: 60-90, nepheline powder: 200-400,
Graphite: 150-300, sodium-chlor: 250-350, saltcake: 0.2-5,
Unslaked lime: 400-500;
Separate between deoxidation promotor and the bushel iron ore deposit and mix like this: said components material water is dissolved, admix in the water after dissolving, mix with the bushel iron ore deposit, wherein, what can not dissolve directly admixes in the bushel iron ore deposit with powder.Certainly, if the fuel of heating is when use coal, separation deoxidation promotor also can be directly and coal mix.
(3), the mixture in the described step (2) is placed earth kiln or outstanding kiln, and it is carried out even heating heat up, when temperature reached 550 ℃～850 ℃, the iron ore of living had been grilled thoroughly and has been cared, with its taking-up;
(4), the product after pyroprocessing is good in the above-mentioned steps is put into the ball milling machine, add water and grind to form ore pulp;
(5), above-mentioned ore pulp is delivered in the settling tank after the magnetic separator magnetic separation, be finished product after the precipitation filter is done, this finished product is exactly a fine powder of magnetite.
In the present invention, the bushel iron ore deposit is 1 with separating deoxidation promotor optimum range by weight: (1 ‰～2 ‰), optimum weight ratio are 1: 1.5 ‰. in separating deoxidation promotor, the effect of plaster stone is that isolated impurity is set in together; The effect of marble dust is that the contaminant removal that solidifies is fallen; The effect of nepheline powder and sodium-chlor is that the crystal water in the ore is taken off, and plays the rising of the content of control phosphorus simultaneously; The effect of graphite is in order to mend the effect of carbon and deoxidation; The effect of saltcake is the hardness for softening ore; The effect of unslaked lime is in order to separate impurity and the desulfurization in the ore, and can play the rising of controlling phosphorus. because the such use of each component, it is the effect of at high temperature playing separation, removing, deoxidation, benefit carbon that separation deoxidation promotor mainly acts on, the objectionable impuritiess such as main sulphur in the iron ore, phosphorus, crystal water, sodium, mercury of promptly at high temperature will living are separated, and remove the impurity of separating; Oxygen level in the iron ore alive is than higher, so necessary deoxidation its objective is in order to improve the quality of product; By lacking carbon in the iron ore of living,, its objective is in order to improve the carbon content in the product so must mend carbon.
The fine powder of magnetite that uses method of the present invention to produce, the one, sodium in the iron ore alive, copper, gold, crystal water, mercury, magnesium etc. are disposed, the 2nd, it is low-phosphorous that the high-sulfur high phosphorus in the iron ore of living is converted into low-sulfur, make iron ore alive change magnetite into, the every index of the magnetite that it is transformed into reaches the standard of country's promulgation.When smelting iron, save the time of breeze being dissolved into molten iron with this fine powder of magnetite, saved fuel simultaneously; Because the molten iron impurities of producing is few, can directly enter in the steel melting furnace and make steel, and has saved electric energy; Because according to the fine powder of magnetite content height that the inventive method is produced, general iron-holder is higher than 62%, can reach at most about 78%, therefore, and the steel output height that the former magnetite of the rate ratio of the steel of producing is produced, approximately per 100 tons can exceed the 2-3 ton.
Owing to adopted technique scheme, that the present invention has is with low cost, produce easy advantage, can reduce content of harmful such as sulphur, phosphorus, zinc, sodium, copper, gold, silicon, crystal water, mercury, magnesium significantly, and make iron level be higher than 62%, make every index of fine powder of magnetite satisfy national standard fully, utilize it can produce the high-quality steel fully.
(4), embodiment
The invention will be further described below in conjunction with embodiment:
The present invention is undertaken by following step:
(1), the powdered iron ore of will living is broken into the bushel iron ore deposit;
(2), be the bushel iron ore deposit in the above-mentioned steps 1 by weight with separating deoxidation promotor: (1 ‰～5 ‰) ratio mixes; Described separation deoxidation promotor is made up of marble dust, plaster stone, nepheline powder, graphite, sodium-chlor, saltcake and unslaked lime, and their weight part is respectively:
Marble dust: 50-80, plaster stone: 60-90, nepheline powder: 200-400,
Graphite: 150-300, sodium-chlor: 250-350, saltcake: 0.2-5,
Unslaked lime: 400-500;
Separate between deoxidation promotor and the bushel iron ore deposit and mix like this: said components material water is dissolved, admix in the water after dissolving, mix with the bushel iron ore deposit, wherein, what can not dissolve directly admixes in the bushel iron ore deposit with powder.Certainly, if the fuel of heating is when use coal, separation deoxidation promotor also can be directly and coal mix.
(3), the mixture in the described step (2) is placed earth kiln or outstanding kiln, and it is carried out even heating heat up, when temperature reached 550 ℃～850 ℃, the iron ore of living had been grilled thoroughly and has been cared, with its taking-up;
(4), the product after pyroprocessing is good in the above-mentioned steps is put into the ball milling machine, add water and grind to form ore pulp;
(5), above-mentioned ore pulp is delivered in the settling tank after the magnetic separator magnetic separation, be finished product after the precipitation filter is done, this finished product is exactly a fine powder of magnetite.
In the present invention, the bushel iron ore deposit is 1 with separating deoxidation promotor optimum range by weight: (1 ‰～2 ‰), optimum weight ratio are 1: 1.5 ‰. in separating deoxidation promotor, the effect of plaster stone is that isolated impurity is set in together; The effect of marble dust is that the contaminant removal that solidifies is fallen; The effect of nepheline powder and sodium-chlor is that the crystal water in the ore is taken off, and plays the rising of the content of control phosphorus simultaneously; The effect of graphite is in order to mend the effect of carbon and deoxidation; The effect of saltcake is the hardness for softening ore; The effect of unslaked lime is in order to separate impurity and the desulfurization in the ore, and can play the rising of controlling phosphorus. because the such use of each component, it is the effect of at high temperature playing separation, removing, deoxidation, benefit carbon that separation deoxidation promotor mainly acts on, the objectionable impuritiess such as main sulphur in the iron ore, phosphorus, crystal water, sodium, mercury of promptly at high temperature will living are separated, and remove the impurity of separating; Oxygen level in the iron ore alive is than higher, so necessary deoxidation its objective is in order to improve the quality of product; By lacking carbon in the iron ore of living,, its objective is in order to improve the carbon content in the product so must mend carbon.
The fine powder of magnetite that uses method of the present invention to produce, the one, sodium in the iron ore alive, copper, gold, crystal water, mercury, magnesium etc. are disposed, the 2nd, it is low-phosphorous that the high-sulfur high phosphorus in the iron ore of living is converted into low-sulfur, make iron ore alive change magnetite into, the every index of the magnetite that it is transformed into reaches the standard of country's promulgation.
The weight part that separates deoxidation promotor can be respectively:
Marble dust: 52, plaster stone: 60, the nepheline powder: 200,
Graphite: 158, sodium-chlor: 260, saltcake: 0.2,
Unslaked lime: 400.
The optimum value of separating the weight part of deoxidation promotor is:
Marble dust: 65, plaster stone: 75, the nepheline powder: 300,
Graphite: 225, sodium-chlor: 300, saltcake: 2.6,
Unslaked lime: 450.
The weight part that separates deoxidation promotor can also be respectively:
Marble dust: 80, plaster stone: 90, the nepheline powder: 400,
Graphite: 300, sodium-chlor: 350, saltcake: 5,
Unslaked lime: 500.
In the present invention, can be coal to the used fuel of described mixture heating up, also can be natural gas.
When heating fuel is used coal, can use earth kiln, the size in bushel iron ore deposit is 2cm～7cm; In earth kiln, bushel iron ore deposit and the coal relation of putting is to carry out lay by one deck coal one deck bushel iron ore deposit mode successively, until being put into the kiln top; The slurry fineness that the ball milling machine grinds to form is 150 orders～250 orders, and the optimum fineness scope is 180 orders～200 orders.
When heating fuel is used coal, also can use outstanding kiln, the size in bushel iron ore deposit is 0.5mm～12mm; In outstanding kiln, bushel iron ore deposit and coal mix; The slurry fineness that the ball milling machine grinds to form is 150 orders～250 orders, and the optimum fineness scope is 180 orders～200 orders.
Among the present invention, it is 750 ℃ to described mixture heating up temperature optimum value.It can certainly be 650 ℃.
Claims (10)
1. method with producing fine powder of magnetite from active iron ore, its step is as follows:
(1), the powdered iron ore of will living is broken into the bushel iron ore deposit;
(2), be the bushel iron ore deposit in the above-mentioned steps 1 by weight with separating deoxidation promotor: (1 ‰～5 ‰) ratio mixes; Described separation deoxidation promotor is made up of marble dust, plaster stone, nepheline powder, graphite, sodium-chlor, saltcake and unslaked lime, and their weight part is respectively:
Marble dust: 50-80, plaster stone: 60-90, nepheline powder: 200-400,
Graphite: 150-300, sodium-chlor: 250-350, saltcake: 0.2-5,
Unslaked lime: 400-500;
(3), the mixture in the described step (2) is placed earth kiln or outstanding kiln, and it is carried out even heating heat up, when temperature reached 550 ℃～850 ℃, the iron ore of living had been grilled thoroughly and has been cared, with its taking-up;
(4), the product after pyroprocessing is good in the above-mentioned steps is put into the ball milling machine, add water and grind to form ore pulp;
(5), above-mentioned ore pulp is delivered in the settling tank after the magnetic separator magnetic separation, be finished product after the precipitation filter is done, this finished product is exactly a fine powder of magnetite.
2. the method with producing fine powder of magnetite from active iron ore as claimed in claim 1 is characterized in that the weight part that separates deoxidation promotor is respectively:
Marble dust: 52, plaster stone: 60, the nepheline powder: 200,
Graphite: 158, sodium-chlor: 260, saltcake: 0.2,
Unslaked lime: 400.
3. the method with producing fine powder of magnetite from active iron ore as claimed in claim 1 is characterized in that the weight part that separates deoxidation promotor is respectively:
Marble dust: 65, plaster stone: 75, the nepheline powder: 300,
Graphite: 225, sodium-chlor: 300, saltcake: 2.6,
Unslaked lime: 450.
4. the method with producing fine powder of magnetite from active iron ore as claimed in claim 1 is characterized in that the weight part that separates deoxidation promotor is respectively:
Marble dust: 80, plaster stone: 90, the nepheline powder: 400,
Graphite: 300, sodium-chlor: 350, saltcake: 5,
Unslaked lime: 500.
5. as claim 1,2,3 or 4 described methods with producing fine powder of magnetite from active iron ore, it is characterized in that: to the used fuel of described mixture heating up is coal.
6. the method with producing fine powder of magnetite from active iron ore as claimed in claim 5, it is characterized in that: the size in bushel iron ore deposit is 2cm～7cm; In earth kiln, bushel iron ore deposit and the coal relation of putting is to carry out lay by one deck coal one deck bushel iron ore deposit mode successively, until being put into the kiln top; The slurry fineness that the ball milling machine grinds to form is 150 orders-250 orders.
7. the method with producing fine powder of magnetite from active iron ore as claimed in claim 5, it is characterized in that: the size in bushel iron ore deposit is 0.5mm～12mm; In outstanding kiln, bushel iron ore deposit and coal mix; The slurry fineness that the ball milling machine grinds to form is 150 orders-250 orders.
8. as claim 1,2,3 or 4 described methods with producing fine powder of magnetite from active iron ore, it is characterized in that: to the used fuel of described mixture heating up is natural gas.
9. as claim 1,2,3 or 4 described methods with producing fine powder of magnetite from active iron ore, it is characterized in that: to described mixture heating up temperature is 750 ℃.
10. as claim 1,2,3 or 4 described methods with producing fine powder of magnetite from active iron ore, it is characterized in that: to described mixture heating up temperature is 650 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200610095092A CN1916196B (en) | 2006-09-05 | 2006-09-05 | Method for producing fine powder of magnetite from active iron ore |
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| CN200610095092A CN1916196B (en) | 2006-09-05 | 2006-09-05 | Method for producing fine powder of magnetite from active iron ore |
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| CN1916196A CN1916196A (en) | 2007-02-21 |
| CN1916196B true CN1916196B (en) | 2010-05-12 |
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| CN200610095092A Expired - Fee Related CN1916196B (en) | 2006-09-05 | 2006-09-05 | Method for producing fine powder of magnetite from active iron ore |
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| CN106269230B (en) * | 2016-10-10 | 2017-11-21 | 亚洲硅业（青海）有限公司 | The minimizing technology of graphite clamping petal impurity in a kind of silicon grain material |
| CN108796214A (en) * | 2018-08-07 | 2018-11-13 | 石启洁 | Rare earth deoxidation accelerating agent and the method for producing bloodstone fine powder with iron oxide ore |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1147018A (en) * | 1996-05-03 | 1997-04-09 | 云南特钢集团公司 | Process and apparatus for production of direct reduced iron |
| CN1231223A (en) * | 1998-04-09 | 1999-10-13 | 丛文华 | Process for preparation of high-purity iron powder |
| CN1563441A (en) * | 2004-03-29 | 2005-01-12 | 孙殿卿 | Manufacturing technqiue for enriching iron through modifying hematite |
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- 2006-09-05 CN CN200610095092A patent/CN1916196B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1147018A (en) * | 1996-05-03 | 1997-04-09 | 云南特钢集团公司 | Process and apparatus for production of direct reduced iron |
| CN1231223A (en) * | 1998-04-09 | 1999-10-13 | 丛文华 | Process for preparation of high-purity iron powder |
| CN1563441A (en) * | 2004-03-29 | 2005-01-12 | 孙殿卿 | Manufacturing technqiue for enriching iron through modifying hematite |
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