CN104928429A - Metallization reduction utilization method of paigeite - Google Patents
Metallization reduction utilization method of paigeite Download PDFInfo
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- CN104928429A CN104928429A CN201510381382.1A CN201510381382A CN104928429A CN 104928429 A CN104928429 A CN 104928429A CN 201510381382 A CN201510381382 A CN 201510381382A CN 104928429 A CN104928429 A CN 104928429A
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Abstract
The present invention provides a metallization reduction utilization method of paigeite. The method comprises the following elements: mixing well crushed and ground paigeite with reduction coal according to a certain mass ratio, adding an organic binder and water, and preparing a cold consolidation pellet; placing the pellet into a rotary hearth furnace for metalization reduction, cooling and grinding reduction products, adding water, and carrying out magnetic separation to obtain iron powder and boron-rich slag. The iron powder can be used in steelmaking, and boron-rich residue can be used as a raw material for the preparation of boric acid. The invention has the characteristics of efficient separation of iron and boron, high recovery rate of iron and boron and achieve rational utilization of resources, and has practical significance for the development and utilization of abundant low grade paigeite.
Description
Technical field
The invention belongs to Metallurgical resources technical field of comprehensive utilization, be specifically related to a kind of method based on carbothermic method separating boron and iron from paigeite.
Background technology
Boron is grand strategy resource, is the important substance guarantee of the national economic development and national security, is widely used in all kinds of field, as metallurgy, chemical industry, nuclear power etc.China's boron resource and products thereof import volume is increasing gradually in recent years.Only for boric acid, 2012, the import volume of boric acid reached 16.04 ten thousand tons, the amount of money 13765.22 ten thousand dollars; The import volume 20.37 ten thousand tons of boric acid in 2013 increases by 27% on a year-on-year basis, and the amount of money is 15,830 ten thousand dollars, increases by 15% on a year-on-year basis.In addition, China every year also can a large amount of borax, the crude boron stone of import.
China's boron resource is formed primarily of szaibelyite, salt lake type boron rock, paigeite three class.Szaibelyite resource is because wherein B
2o
3grade higher, complete processing is ripe, is widely used.But szaibelyite reserves are only 6.64% of China's boron rock total reserves, szaibelyite resource is therefore increasingly exhausted.Salt lake type boron rock is mainly positioned at China Qinghai-Tibet Platean, accounts for 33.13% of China's boron rock total quantity, because limit by Structure Dynamics In The Qinghai-tibet Region transportation condition and field conditions, salt lake type boron rock utilizes difficulty.Paigeite rich reserves, accounts for about 58% of China's boron reserves, is mainly distributed in the Liao Dynasty of China-Ji area.If effectively paigeite can be developed, for the Sustainable development important in inhibiting of China's boron industry.In addition, China's steel industry reaches about 60% for imported Fe ore dependency degree, in addition foreign country's manipulation iron ore price, and this has potential safety hazard for China's steel industry and the national economic development.Nearly 200,000,000 tons of iron content in the paigeite of the Liao Dynasty-Ji area, the effective exploitation of paigeite resource utilizes the sustainable and stable development also important in inhibiting for China's steel industry.
In existing industrial production, physical concentration, wet processing process, " blast furnace process " technique three kinds are mainly contained for paigeite Application way.
Physical concentration method, namely utilizes magnetic separation-gravity treatment beneficiation combined method method.Adopt ore grinding and multistage to select division technique, acquisition boron concentrate and granularity are less than the boron-containing iron concentrate of 0.074mm.The recovery rate of the method iron and boron is lower, and because constituent element particle is tiny in ore, causes boron, iron separating difficulty larger.Also have subsequent treatment process that ferro-boron is separated for product boron-containing iron concentrate, technical process like this can be elongated, is unfavorable for save energy.
Wet processing process, by paigeite strong acid such as vitriolization, boron is existed as boric acid, and ferro element exists in the form of salts, then through purification, crystallization, extraction, stripping process, final acquisition ferrous sulfate crystal and boric acid.Wet processing is applicable to processing the higher ore of boron-containing quantity, is not suitable for processing the low ore of boron product bit comparison, and sour consumption is larger, not only etching apparatus but also increase cost, and be mixed into a large amount of acid ions in residue, the damage ratio for environment is larger.
Blast furnace process utilizes paigeite technique, by paigeite by magnetic separation-gravity treatment beneficiation combined method, obtains the boron-containing iron concentrate powder that granularity is less than 0.074mm.Then by the agglomeration of boron-containing iron concentrate powder sintering, add ironmaking in blast furnace, finally obtain pig iron containing boron and Boron Slag.This technical process is long, uses boron-containing iron concentrate to increase coke ratio, improve smelting cost in blast furnace, and lining erosion is serious, and in Boron Slag, the expression activitiy of boron is low, cannot meet the requirement of carbon alkali method for producing borax.
Utilization for paigeite also has other technique, such as:
1) the molten point method of rotary kiln for directly reducing-electric furnace.Paigeite is obtained boron-containing iron concentrate by magnet-gravity ore by the method, to concentrate oven dry, abrasive material, secondary drying, pelletizing, then pelletizing and coal dust mixing is placed in reducing apparatus direct-reduction, then to reduzate cooling, abrasive material.Fines is put into molten point of electric furnace, obtain metallic iron and boron-rich material.This technique is because what utilize is the boron-containing iron concentrate that choosing point obtains from paigeite, so technical process is longer, and it is high to melt separation temperature, and energy consumption is high, big for environment pollution.
2) number of patent application CN201210179135.7 proposes the mixed additive agglomeration of paigeite and sodium carbonate, sodium oxalate, sodium sulfate, natrium humate, fulvic acid sodium, then reducing roasting recycling iron powder and sodium metaborate.The method uses additive types various and expensive, complex process, and sodium metaborate solubleness is higher simultaneously, and when reclaiming sodium metaborate, the steam output of solution is large, and the cost recovery of boron is high.
3) patent No. CN 103074483A proposes a kind of boron-containing iron concentrate selective reduction Application way: by boron-containing iron concentrate powder and reduction coal dust, mixing, reduction, the method be then separated.This technique use boron-containing iron concentrate be paigeite through dry type magnetic separation, fragmentation, ore grinding and wet magnetic separation, again ore grinding and wet magnetic separation gained, the granularity of boron-containing iron concentrate is totally less than 0.074mm.The preparation process of boron-containing iron concentrate is loaded down with trivial details, makes the method flow process elongated.In addition in metallurgical industry is produced, the breeze that granularity is less than 0.074mm is difficult to directly be used for smelting.
The ore of valency constituent element is had not obtain effective exploitation utilization yet so paigeite is this at present containing multiclass.Develop a kind of efficient, environmental friendliness, energy-conservation, cost-effective paigeite comprehensive utilization of resources novel process and have strategic importance for the Sustainable development of China's boron industry and Iron And Steel Industry.
Summary of the invention
Existing paigeite utilizes technology to have the following disadvantages: boron and iron are difficult to be separated, melt that separating energy consumption is high, environmental pollution is larger; Some technical schemes are boron-containing iron concentrate powder paigeite being less than to 0.074mm through dry type magnetic separation, fragmentation, ore grinding and wet magnetic separation, the sequence of operations such as ore grinding, wet magnetic separation obtains again granularity, then subsequent disposal is carried out to boron-containing iron concentrate, ferro-boron is separated, causes flow process elongated.
For solving the problems of the technologies described above, the invention provides a kind of metallization reduction Application way of paigeite, the method directly can process the paigeite that all iron content is not less than 15% (weight percent), boron oxide content is not less than 5% (weight percent).Specifically, as shown in Figure 1, the metallization reduction Application way of a kind of paigeite of the present invention comprises the steps:
(1) paigeite is broken, levigate to below 0.074mm, reduction coal is crushed to below 0.074mm simultaneously; Wherein, the crusher of this area conventional commercial or pulverizer all can be used for the present invention.
In the present invention, the one-level being realized paigeite by jaw crusher is broken, makes paigeite granularity be less than 40mm; Realized the two-stage crushing of paigeite by top fuller crusher, make paigeite granularity be less than 10mm; Paigeite granularity being less than 10mm is inserted ball mill and is obtained the paigeite that granularity is less than 0.074mm; Use coal pulverizer by levigate for reduction coal to below 0.074mm.
The present invention's paigeite used refers to that all iron content is not less than 15%, and the difficulty that boron oxide content is not less than 5% selects low taste paigeite, and described per-cent is weight percentage; Reduction coal used is bituminous coal or hard coal, and in coal, fixed carbon content is not less than 65%, and described per-cent is weight percentage.
(2) by the paigeite powder after fragmentation and reduction coal dust, the ratio being 1.0 ~ 1.5 according to the mol ratio of oxygen in oxides-containing iron in fixed carbon in reduction coal and paigeite mixes, and prepares compound.
Wherein, described reduction coal is bituminous coal or hard coal, and wherein fixed carbon content is not less than 70%, and volatile content is not higher than 9%, and described per-cent is weight percentage.
(3) in compound, add organic binder bond and water, fully mix, then shelving;
Wherein, the time of shelving is 30 ~ 40min, and the object of shelving is that moisture is fully spread evenly.
Organic binder bond can adopt common soybeans powder, cost-saving, does not bring other foreign metal ions into; Preferably, the quality of the soyflour added is 2.5% of mixture quality, and the quality of the water added is 7% of mixture quality.
(4) get step (3) compound and be pressed into pelletizing and pelletizing is dry; Wherein, described pelletizing is right cylinder pelletizing, and preferably diameter is 20mm, highly is the right cylinder pelletizing of 25mm.
The present invention selects the pelletizing of this size to meet rotary hearth furnace raw material requirement, takes into account the reduction effect of ferriferous oxide in industrial production efficiency and pelletizing.By dry for the pelletizing of preparation, make pelletizing remove moisture and possess some strength, meeting rotary hearth furnace or electric furnace enters stove furnace charge requirement of strength.
(5) pelletizing is inserted in the rotary hearth furnace laying a small amount of Graphite Powder 99 in advance and carry out metallization reduction; Metallization reduction refers to that controlling in reduction coal in fixed carbon and paigeite the mol ratio of oxygen in oxides-containing iron is 1.0 ~ 1.5, and at the temperature of 1305 ~ 1350 DEG C, anoxic reduction 15 ~ 25min, makes iron particle forming core, assembles, grows up to 0.1mm.
Laying a small amount of Graphite Powder 99 in reducing apparatus is to provide reducing atmosphere, prevents the material after reducing by secondary oxidation.Simultaneously because Graphite Powder 99 reactivity is weaker than hard coal, can avoid participating in reduction reaction directly.
Graphite Powder 99 and the rotary hearth furnace of this area conventional commercial all can be used for the present invention.
(6) the compound taking-up after reduction is carried out being quickly cooled to room temperature.
Wherein, the described type of cooling cools for completely cutting off air, and the present invention preferably passes into protective atmosphere cooling or compound carried out shrend or bury coal cooling, and more preferably, protective atmosphere is nitrogen atmosphere; Described room temperature does not have an obvious temperature limit, can determine according to room temp during concrete operations.
(7) cooling material being carried out ore grinding, is below 0.1mm to granularity, and the stirring that added water by abrasive material is mixed with suspension liquid;
Wherein, described ore grinding step adopts this area ordinary method to carry out.
(8) under magneticstrength is 55 ~ 105mT, magnetic separation is carried out to the suspension liquid that step (7) obtains, obtain iron powder and Boron Slag liquid; Boron Slag liquid is separated and obtains Boron Slag and water, and this part water is used for step (7) or step (3) realizes recycle.
In gained iron powder, the grade of iron is more than 92%, and degree of metalization is more than 98%, and the recovery rate of iron is more than 94%.B in gained Boron Slag
2o
3grade be more than 14%, recovery rate is more than 93%.
The principle of foregoing invention method institute foundation is as follows:
Chemical analysis shows, in paigeite, all iron content is between 15 ~ 50%, and average content is 33%; B
2o
3content is between 5 ~ 9%, and average content is 7%; SiO
2content is between 10 ~ 25%, and average content is 14%; Content of MgO is between 23 ~ 29%, and average content is 26%, and described per-cent is weight percentage; Above material is the mineral wealth of utility value.As can be seen from composition, iron level and B in paigeite
2o
3content does not all reach respective industrial grade requirement, therefore can not be simple produce iron or boron by traditional method.
X-ray diffraction analysis shows, boron-containing iron concentrate is primarily of Fe
3o
4, MgFe
2o
4, Mg
3si
2o
5(OH)
4deng composition; And paigeite is primarily of Fe
3o
4, MgFe
2o
4, Mg
2feBO
5, Mg
3si
2o
5(OH)
4, MgBO
2(OH), the composition such as MgO.Can find out, the ore deposit that boron-containing iron concentrate is compared in the ore deposit of paigeite is more complicated mutually, and therefore, the intractability of paigeite is also larger.
Paigeite provided by the invention metallization reduction Application way directly can process paigeite, processes after multistage ore separation obtains boron-containing iron concentrate without the need to carrying out it again, and boron and iron separating effect obviously, recovery rate is higher.
Containing FeO, Fe in paigeite
2o
3, B
2o
3, MgO, SiO
2deng.These materials all likely react with the CO that formed in the fixed carbon in hard coal or reducing apparatus in reduction process.The standard Gibbs function expression formula of each type oxide and the contingent reaction of CO and C and reaction is as shown in table 1:
Table 1
In equilibrium conditions, when temperature is at 1305 ~ 1350 DEG C, B
2o
3, SiO
2, MgO tri-kinds of materials reduction reaction Gibbs free energy be greater than 0, can not reduce; And the Reduction of Oxide reaction normal Gibbs free energy of iron is less than 0, can be reduced, the principle of metallization reduction that Here it is.Consider all kinds of material in system, for reaching the object of metallization reduction, selected temperature range is 1305 ~ 1350 DEG C.Selected temperature is unsuitable too high, otherwise partial oxidation boron can be caused to be reduced in generation boron infiltration iron, causes boron and iron separating effect to be deteriorated.
In paigeite, iron oxide particle is extremely tiny, can find that ferriferous oxide is composed with multiple ore deposit phase forms such as magnetites, tiltedly chrysotile, magnesioferrite, ludwigite in ore deposit by XRD analysis.Also there are other ore deposit phase, such as suanite, serpentines etc. in ore.These ore deposits are fitted together to mutually, mix symbiosis, and conventional ore dressing is difficult to the effective separation realizing iron, boron.By metallization reduction, realize the gathering of iron particle, grow up.Although the reduction of ferro element can be realized at a lower temperature, iron particle aggregation, grow up more difficult.High temperature can promote carburizing in iron, reduces the fusing point of iron, promotes that iron liquid is formed, and promotes iron particle forming core, assembles, grows up.Again by cooling fast reduzate, the iron of the semi-melting state formed under hot conditions is met rapid desufflation, and then realizes and being separated of slag phase.In reduction coal of the present invention, in fixed carbon and paigeite, in oxides-containing iron, the mol ratio of oxygen is chosen between 1.0 ~ 1.5, coal blending amount suitably increases and is conducive to carburizing in iron in reduction process, reduce iron phase fusing point, promote the gathering of iron particle, grow up, and then promote being separated of iron and slag; Coal blending amount excessively increases, then waste energy, and brings impurity reduction iron and boron separating effect into.
In paigeite, full Iron grade is lower, MgO, SiO
2comparision contents is large, B
2o
3, CaO, Al
2o
3comparision contents is low; According to constituent element composition each in the ore of paigeite, analyze that CaO mass percent is 0.3%, Al
2o
3mass percent is the B of 1%
2o
3-MgO-SiO
2ternary phase diagrams (see Fig. 2), when knowing that paigeite reduces, slag phase fusing point is between 1600 DEG C of thermoisopleths and 1650 DEG C of thermoisopleths.Reductase 12 0min at the temperature (or the service temperature higher than the present invention is as 1400 DEG C, 1420 DEG C) of condition of the present invention, can not form free-pouring iron phase or slag phase in reduction system.In reduction process, iron is difficult to form large pearl iron and forms obvious boundary mutually with slag, and iron particle is the tight embedding cloth with the material of surrounding still.
By to the cooling material ore grinding after reduction to 0.1mm, the iron particle that reduction process can be made to grow up to about 0.1mm is fully separated with ambient substance.Again through follow-up magnetic separation process, iron powder and Boron Slag two kinds of products can be obtained.
Comprehensively take into account the recovery rate of iron and boron oxide, magneticstrength scope of the present invention is 55 ~ 105mT.If magneticstrength is lower than 55mT, then enters in Boron Slag because magneticstrength is weak during the magnetic separation of part iron powder, reduce the recovery rate of iron, cause iron and boron separating effect to be deteriorated.Along with the increase of magneticstrength, be conducive to obtaining more iron powder when magnetic separation, improve the recovery rate of iron.If magneticstrength is higher than 105mT, then during magnetic separation, the material of the weak magnetic of part enters in iron powder, reduces the recovery rate of boron oxide, causes iron and boron separating effect to be deteriorated.
The present invention, by preparing the carbonaceous pelletizing of paigeite, makes carbon contact closely with ferric oxide, is conducive to metallization reduction, is conducive to the carburizing of iron in high temperature reduction process, thus reduction iron fusing point promotes iron particle forming core, assembles, grows up.Select coal as the raw material preparing pelletizing, effectively reduce production cost.
The present invention selects rotary hearth furnace as reducing apparatus, and rotary hearth furnace can make the carbonaceous pelletizing of paigeite open in flame at high temperature to heat, and be conducive to fast restore, furnace charge is short in the furnace reduction time; Greatly save the time compared to traditional tunnel kiln reduction or rotary kiln reduction, be conducive to improving output.Recovery time of the present invention is elected as between 15 ~ 25min, is also to choose based on rotary hearth furnace smelting technology.
Rotary hearth furnace uses the thin bed of material, thus not high to the requirement of strength of pelletizing, and cold bound pellet prepared by paigeite and hard coal can be used as raw materials for metallurgy.Adopt cold bound pellet to enter rotary hearth furnace smelting to be also conducive to reducing energy consumption.
In the Boron Slag that the present invention obtains, boron oxide is active more than 85%, can directly be used for producing the product such as borax, boric acid.
The present invention has the following advantages compared with traditional paigeite Application way:
(1) strong for adaptability to raw material, all kinds of paigeite can be processed and comprise the lower ore of boron-containing quantity;
(2) flow process is shorter, directly processes paigeite raw ore, obtains boron-containing iron concentrate operate without the need to carrying out magnetic-weight beneficiation combined method for paigeite;
(3) save energy, melts divisional processing method reduction temperature compared to paigeite lower;
(4) boron, iron yield are higher, and choosing point mine tailing Boron Slag can be used as the raw material producing other boron products, make full use of Metallurgical resources.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention.
Fig. 2 be in paigeite CaO mass percentage be 0.3%, Al
2o
3mass percentage is the B of 1%
2o
3-MgO-SiO
2ternary phase diagrams.
Embodiment
Below in conjunction with specific embodiment, the present invention is further described, and advantage and disadvantage of the present invention will describe clearly, but these examples are only exemplary in nature, are not construed as limiting scope of the present invention.
First to the present invention use paigeite raw material and reduction coal coal be described.
Embodiment of the present invention paigeite used derives from Dandong, Liaoning Province Fengcheng City, and in mineral, TFe content is 27.51%, B
2o
3content is 8.45%; Reduction coal is hard coal, derives from Laiwu, Shandong Province Steel Plant, and in hard coal, fixed carbon content is 81.40%, and described per-cent is weight percentage.Paigeite becomes to be respectively in table 2 and table 3 with hard coal.
In addition, other devices of using of the present invention and raw material are device and the raw material of this area conventional commercial.Following embodiment carries out metallization reduction process using silicon molybdenum rod furnace (being used for simulating rotary hearth furnace) as reducing apparatus, but those skilled in the art also can directly select rotary hearth furnace as reducing apparatus.
Table 2 paigeite chemical composition (weight percent, %)
Table 3 reduces with coal hard coal composition analysis (weight percent, %)
Embodiment 1
Adopt jaw crusher to carry out one-level fragmentation to paigeite, make paigeite granularity be less than 40mm; Adopt top fuller crusher to carry out two-stage crushing to paigeite, make paigeite granularity be less than 10mm; Paigeite granularity being less than 10mm is inserted ball mill and is obtained the paigeite that granularity is less than 0.074mm.Coal pulverizer is adopted to be less than 0.074mm by levigate for hard coal to granularity.
Two of release mesh kinds of mixing of materials are evenly formed compound, and in reduction coal, in fixed carbon and paigeite, in oxides-containing iron, the mol ratio of oxygen is 1.5.In compound, add the water that soyflour that quality is mixture quality 2.5% and quality are mixture qualities 7%, fully mix, and shelving 30min, moisture is fully distributed in compound.
It is 20mm that above-mentioned compound is made diameter at 12MPa pressure, is highly about the right cylinder pelletizing of 25mm, and pelletizing is dry 12h in the baking oven of 150 DEG C, confirms that weight no longer changes rear for metallization reduction.
Inserted by dried pelletizing in the silicon molybdenum rod furnace laying a small amount of Graphite Powder 99 in advance, at 1305 DEG C, carry out metallization reduction to pelletizing, the recovery time is 25min.
Material after reduction is taken out, puts into water and carry out shrend and completely cut off Rapid cooling in the air, until room temperature.Cooled material is inserted grinding attachment and carries out ore grinding, make raw meal particle size be less than 0.1mm, the stirring that adds water is mixed with suspension liquid.Then under 105mT magneticstrength condition, carry out magnetic separation, after magnetic separation, obtain iron powder and Boron Slag liquid.Boron Slag liquid is separated and obtains Boron Slag and water, and this part water reuses, and is used for being mixed with suspension with the levigate reducing material to 0.1mm.
In iron powder, Iron grade is 92.83%, and degree of metalization is 99.21%, and recovery rate is 94.52%.B in Boron Slag
2o
3grade be 14.32%, B
2o
3recovery rate be 93.87%.
Embodiment 2
Adopt jaw crusher to carry out one-level fragmentation to paigeite, make paigeite granularity be less than 40mm; Adopt top fuller crusher to carry out two-stage crushing to paigeite, make paigeite granularity be less than 10mm; Paigeite granularity being less than 10mm is inserted ball mill and is obtained the paigeite that granularity is less than 0.074mm.Coal pulverizer is adopted to be less than 0.074mm by levigate for hard coal to granularity.
After fragmentation two kind of a mixing of materials is evenly formed compound, and in reduction coal, in fixed carbon and paigeite, in oxides-containing iron, the mol ratio of oxygen is 1.0.In compound, add the water that soyflour that quality is mixture quality 2.5% and quality are mixture qualities 7%, fully mix, and shelving 40min, moisture is fully distributed in compound.
Getting a certain amount of above-mentioned compound, to make diameter at 12MPa pressure be 20mm, and be highly about the right cylinder pelletizing of 25mm, pelletizing is dry 12h in the baking oven of 150 DEG C, confirms that weight no longer changes and to reduce for metallization afterwards.
Inserted by dried pelletizing in the silicon molybdenum rod furnace laying a small amount of Graphite Powder 99 in advance, at 1350 DEG C, carry out metallization reduction to pelletizing, the recovery time is 15min.
Material after reduction is taken out, imbeds in coal seam and cool fast, until room temperature.Cooled material is inserted grinding attachment and carries out ore grinding, make raw meal particle size be less than the 0.1mm stirring that adds water and be mixed with suspension liquid.Then under 55mT magneticstrength condition, carry out magnetic separation, after magnetic separation, obtain iron powder and Boron Slag liquid.Boron Slag liquid is separated and obtains Boron Slag and water, and this part water reuses, and is used for being mixed with suspension with the levigate reducing material to 0.1mm.
In iron powder, the grade of iron is 94.17%, and degree of metalization is 98.96%, and recovery rate is 95.93%.B in Boron Slag
2o
3grade be 15.32%, B
2o
3recovery rate be 93.18%.
Embodiment 3
Adopt jaw crusher to carry out one-level fragmentation to paigeite, make paigeite granularity be less than 40mm; Adopt top fuller crusher to carry out two-stage crushing to paigeite, make paigeite granularity be less than 10mm; Paigeite granularity being less than 10mm is inserted ball mill and is obtained the paigeite that granularity is less than 0.074mm.Coal pulverizer is adopted to be less than 0.074mm by levigate for hard coal to granularity.
After fragmentation two kind of a mixing of materials is evenly formed compound, and in reduction coal, in fixed carbon and paigeite, in oxides-containing iron, the mol ratio of oxygen is 1.3.In compound, add the water that soyflour that quality is mixture quality 2.5% and quality are mixture qualities 7%, fully mix, and shelving 35min, moisture is fully distributed in compound.
Getting a certain amount of above-mentioned compound, to make diameter at 12MPa pressure be 20mm, and be highly about the right cylinder pelletizing of 25mm, pelletizing is dry 12h in the baking oven of 150 DEG C, confirms that weight no longer changes and to reduce for metallization afterwards.
Inserted by dried pelletizing in the silicon molybdenum rod furnace laying a small amount of Graphite Powder 99 in advance, at 1330 DEG C, carry out metallization reduction to pelletizing, the recovery time is 20min.
Material after reduction is taken out, passes into protection nitrogen atmosphere and cool fast, until room temperature.Cooled material is inserted grinding attachment and carries out ore grinding, make raw meal particle size be less than 0.1mm, the stirring that adds water is mixed with suspension liquid.Then under 80mT magneticstrength condition, carry out magnetic separation, after magnetic separation, obtain iron powder and Boron Slag liquid.Boron Slag liquid is separated and obtains Boron Slag and water, and this part water reuses, and is used for being mixed with suspension with the levigate reducing material to 0.1mm.
In iron powder, the grade of iron is 93.46%, and degree of metalization is 99.61%, and recovery rate is 95.86%.B in Boron Slag
2o
3grade be 14.49%, B
2o
3recovery rate be 94.37%.
To the above-mentioned explanation of the disclosed embodiments, those skilled in the art are realized or uses the present invention.To be apparent for a person skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a metallization reduction Application way for paigeite, it is characterized in that, the method comprises the steps:
(1) paigeite is broken, levigate to below 0.074mm, simultaneously that reduction coal is broken, levigate to below 0.074mm;
(2) by the paigeite after fragmentation and reduction coal, the ratio being 1.0 ~ 1.5 according to the mol ratio of oxygen in oxides-containing iron in fixed carbon in reduction coal and paigeite mixes, and prepares compound;
(3) in compound, organic binder bond and water is added, fully mixing also shelving;
(4) compound of step (3) gained is pressed into pelletizing and pelletizing is dry;
(5) dried pelletizing is carried out metallization reduction;
(6) material after reduction is cooled to room temperature;
(7) cooling material being carried out ore grinding, is below 0.1mm to granularity, and the stirring that adds water is mixed with suspension liquid;
(8) under magneticstrength is 55 ~ 105mT, magnetic separation is carried out to the suspension liquid that step (7) obtains, obtain iron powder and Boron Slag liquid.
2. the metallization reduction Application way of paigeite according to claim 1, it is characterized in that, in step (5), described metallization reduction is anoxic reduction 15 ~ 25min at the temperature of 1305 ~ 1350 DEG C, makes iron particle growth to 0.1mm by metallization reduction.
3. the metallization reduction Application way of paigeite according to claim 1 and 2, it is characterized in that, in described paigeite, all iron content is not less than 15%, and boron oxide content is not less than 5%, and described per-cent is weight percentage.
4. the metallization reduction Application way of the paigeite according to any one of claims 1 to 3, it is characterized in that, described reduction coal is bituminous coal or hard coal, and wherein fixed carbon content is not less than 65%, and described per-cent is weight percentage.
5. the metallization reduction Application way of the paigeite according to any one of Claims 1 to 4; it is characterized in that; in step (6); the described type of cooling is isolated air cooling; preferably; the type of cooling is for passing into protective atmosphere cooling or compound being carried out shrend or bury coal cooling, and more preferably, protective atmosphere is nitrogen atmosphere.
6. the metallization reduction Application way of the paigeite according to any one of Claims 1 to 5, it is characterized in that, in step (5), described metallization reduction process is carried out in rotary hearth furnace.
7. the metallization reduction Application way of the paigeite according to any one of claim 1 ~ 6, it is characterized in that, in step (8), in described iron powder, the grade of iron is more than 92%, and degree of metalization is more than 98%, and the recovery rate of iron is more than 94%.
8. the metallization reduction Application way of the paigeite according to any one of claim 1 ~ 7, is characterized in that, in step (8), in described Boron Slag, and B
2o
3grade be more than 14%, recovery rate is more than 93%.
9. the metallization reduction Application way of the paigeite according to any one of claim 1 ~ 8, it is characterized in that, in step (3), described organic binder bond is soyflour, and the quality of the soyflour preferably added is 2.5% of mixture quality.
10. the metallization reduction Application way of the paigeite according to any one of claim 1 ~ 9, it is characterized in that, in step (4), described pelletizing is right cylinder pelletizing, and preferably diameter is 20mm, highly is the right cylinder pelletizing of 25mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106636520A (en) * | 2016-12-06 | 2017-05-10 | 江苏省冶金设计院有限公司 | System and method for preparing metallized pellet |
| CN106623356A (en) * | 2016-11-23 | 2017-05-10 | 贵州省过程工业技术研究中心 | Red mud recovery method |
| CN112609070A (en) * | 2020-12-16 | 2021-04-06 | 东北大学 | Method for strengthening separation and extraction of boron and iron in boron-containing iron concentrate by suspension reduction roasting |
| CN112624136A (en) * | 2020-12-16 | 2021-04-09 | 东北大学 | Method for enhancing boron crystallization and synergistically improving reactivity of boron-rich slag by additive |
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| CN102162017A (en) * | 2011-03-18 | 2011-08-24 | 北京科技大学 | Method for comprehensively utilizing paigeite by rotary hearth furnace iron bead process |
| CN103074483A (en) * | 2013-01-10 | 2013-05-01 | 东北大学 | Comprehensive utilization method for ferroboron concentrates by virtue of selective reduction |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102162017A (en) * | 2011-03-18 | 2011-08-24 | 北京科技大学 | Method for comprehensively utilizing paigeite by rotary hearth furnace iron bead process |
| CN103074483A (en) * | 2013-01-10 | 2013-05-01 | 东北大学 | Comprehensive utilization method for ferroboron concentrates by virtue of selective reduction |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106623356A (en) * | 2016-11-23 | 2017-05-10 | 贵州省过程工业技术研究中心 | Red mud recovery method |
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| CN106636520A (en) * | 2016-12-06 | 2017-05-10 | 江苏省冶金设计院有限公司 | System and method for preparing metallized pellet |
| CN112609070A (en) * | 2020-12-16 | 2021-04-06 | 东北大学 | Method for strengthening separation and extraction of boron and iron in boron-containing iron concentrate by suspension reduction roasting |
| CN112624136A (en) * | 2020-12-16 | 2021-04-09 | 东北大学 | Method for enhancing boron crystallization and synergistically improving reactivity of boron-rich slag by additive |
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Application publication date: 20150923 |