CN108893601A - A kind of method of high-phosphorus hematite microwave reduction-magnetic separation dephosphorization - Google Patents
A kind of method of high-phosphorus hematite microwave reduction-magnetic separation dephosphorization Download PDFInfo
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- CN108893601A CN108893601A CN201810835704.9A CN201810835704A CN108893601A CN 108893601 A CN108893601 A CN 108893601A CN 201810835704 A CN201810835704 A CN 201810835704A CN 108893601 A CN108893601 A CN 108893601A
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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
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0066—Preliminary conditioning of the solid carbonaceous reductant
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/008—Use of special additives or fluxing agents
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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
- C22B1/11—Removing sulfur, phosphorus or arsenic other than by roasting
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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
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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Abstract
The invention discloses a kind of methods of high-phosphorus hematite microwave reduction-magnetic separation dephosphorization, belong to iron ore direct reducing and technical field of mineral processing.The present invention includes the following steps：High-phosphorus hematite powder, reducing agent, bonding agent, Dephosphorising agent and composite catalyst are added water to mix according to a certain percentage and carry out pelletizing, perforation processing is carried out to pelletizing later and is dried；Pelletizing after drying is placed in microwave oven and carries out heating reduction and dephosphorization treatment, obtains reduction bead；Continue to be put into conical ball mill after bead after reduction is smashed and ground and adds water fine grinding；The reduction ore pulp obtained after fine grinding is subjected to magnetic separation processing to get high-quality Iron concentrate is arrived.The high efficiency dephosphorating processing of high-phosphor oolitic hematite may be implemented using the solution of the present invention, the reduction rate of gained reduced iron powder is higher.
Description
Technical field
The invention belongs to iron ore direct reducings and technical field of mineral processing, and in particular to a kind of high-phosphorus hematite microwave
Heat reduction-magnetic separation dephosphorization method.
Background technique
In recent years, the rapid development of China's steel and iron industry causes the demand of iron ore rapidly to increase.But since China is excellent
Matter iron ore deposit is deficient, Refractory iron ore stone utilization rate is low, and serious supply falls short of demand state is presented in domestic Iron Ore Market, because
The iron ore of this China's steel industry nearly 90% in recent years needs external import, and imported Fe ore substantial appreciation of prices, so as to cause me
State's iron ore imports cost is significantly increased, and causes and seriously affects to the development of China's steel industry.
In China's Refractory iron ore resource, high-phosphor oolitic hematite be a kind of reserves are huge, mining conditions relatively
Good iron ore deposit, existing about 37.2 hundred million tons of explored high-phosphor oolitic hematite stone reserves can explore new resources amount up to over ten billion
Ton.Therefore can effective exploitation and using such complex refractory ore for alleviate China's iron ore imports pressure and accelerate steel
The development of industry is of great significance.But oolitic hematite disseminated grain size is superfine, using quartz or chlorite as the iron mineral of roe core
And gangue mineral has the mutually Zoned structure that wraps up layer by layer, and the objectionable impurities such as Phosphate minerals of such ore association mainly with
Jelly and the densification adhesion of bloodstone oolith, it is difficult to separate, to influence the quality of concentrate.In order to which effective exploitation utilizes high phosphorus roe
Shape bloodstone, China's researcher have done a lot of research work to the dephosphorization of high-phosphor oolitic hematite, are mainly reflected in anti-floating
It selects dephosphorization, leach dephosphorization and reduction method dephosphorization etc..
(1) reverse flotation dephosphorization method
Suitable collecting agent, inhibitor are selected, the reverse flotation separation of part phosphorus may be implemented, existing technique includes using
Single reverse floatation process, strong magnetic-reverse flotation dephosphorization closed circuit technique, desliming-reverse floatation process, Selective agglomeration-reverse flotation,
The group technologies such as magnetizing roast-low intensity magnetic separation-reverse flotation.However due in oolitic hematite iron mineral disseminated grain size it is superfine, and
It is still difficult in the prevalence of the content of phosphorus in iron ore concentrate using physical upgrading method with the close symbiosis of phosphorus ore containing and easy argillization etc.
To meet the requirement of smelting industry.In paper《Yunnan high-phosphor oolitic hematite proposes iron drop phosphorus experimental study》Middle Xu Xing letter proposes
Desliming-reverse flotation test method obtains Iron grade 52.66%, iron recovery 56.07%, the iron essence that phosphorus content is 0.14%
Mine, and Iron grade is generally higher in tailing, and there are certain problem of resource waste.Therefore high phosphorus is handled using reverse floatation process
Oolitic hematite, it is difficult to which acquisition is satisfied with index.
(2) dephosphorization method is leached
Acidleach dephosphorization is so that moieties dissolution in material is entered solution using the aqueous solution of inorganic acid as leaching agent
In, the dephosphorization technology that valuable mineral component phosphorus content reduces after separation of solid and liquid is recycled at pickle liquor by way of mending acid
Reason high-phosphor oolitic hematite can obtain preferable dephosphorization effect, and dephosphorization rate is stablized 85%.Such as, application No. is
CN201310734205.8, the application case of entitled " a kind of low-grade oolitic high-phosphorus hematite dephosphorization liter process for making iron "
Flotation-acidleach dephosphorization method is used, is recycled by mother liquor acid adding, dephosphorization rate can be stablized 90% or more, but this application
The processing step of case is more, needs continuous acid adding circulation, and it is long to be stirred to react the period, and for up to 3 hours, and during its wash water will carry out
It can just be discharged with processing.
Also have using microorganism both at home and abroad and carry out dephosphorization treatment, for example utilizes various bacteria, fungi and actinomyces
Acid is produced by metabolism and dissolves phosphorus ore containing to reduce the pH value of system, while the organic acid for being metabolized generation can also be with Ca2+、
Mg2+、Al3+Plasma, which forms complex compound, can also accelerate the dissolution of phosphorus ore containing.In paper《High-phosphor oolitic hematite reduction roasting
And Biodephosphorization test》Middle Hu Chun is tested using reduction roasting-weak magnetic choosing method, and with aspergillus niger to smart after magnetic separation
Mine carries out Microorganism Leaching experiments for dephosphorization, and dephosphorization rate is 79.68% under lower ore pulp mass fraction, in ore phosphorus content by
0.85% is reduced to 0.17%.Although microorganism is stronger to the ability of dephosphorization, bioleaching process has period length, process
The problems such as complexity etc., need further replenishment of process.
(3) reduction-sorting dephosphorization method
Reduction-separating method mainly includes direct-reduction-separating method and drastic reduction-separating method.This method refers mainly to
Under certain temperature and reduction atmosphere, bloodstone is reduced into metallic iron using reducing agent, adds Dephosphorising agent in reduction process
The trend and distribution of phosphorus are controlled, then is separated by magnetic separation, realizes the removing of phosphorus.The key of reduction process dephosphorization technology is to promote
The reduction for inhibiting phosphorus while iron ore is reduced, makes phosphorus containg substances are as much as possible to retain in gangue, then carries out sorting and go
It removes.It is entitled " a kind of with directly producing spongy iron from high-phosphor oolitic hematite such as application No. is CN200910079152.4
The application case of process " uses drastic reduction method, and concentrate Iron grade after processing reaches 80% or more, but phosphorus content
It is still greater than 0.25%, dephosphorization effect is bad, and its Dephosphorising agent Na2CO3Dosage is up to 20%, so that cost increases.For another example, Shen
Please number be CN200910308267.6, it is entitled " a method of by high phosphorus eel shape bloodstone prepare steel-making furnace charge " Shen
Please case use compound sodium salt reinforced by additive reduction, dephosphorization technology, by with addition of a certain amount of sodium sulphate, sodium carbonate and boron
Sand, reduction can obtain the metal iron powder that Iron grade is lower than 0.08% greater than 92%, phosphorus content at high temperature.But due to compound sodium salt
The fusing point of additive is lower, is also easy to produce molten company so as to cause material melts and reactor, damages reactor larger.
Summary of the invention
1. technical problems to be solved by the inivention
It is an object of the invention to overcome use prior art to high-phosphor oolitic hematite carry out dephosphorization treatment existing for
Upper deficiency provides a kind of method of high-phosphorus hematite microwave reduction-magnetic separation dephosphorization.It can using technical solution of the present invention
To realize the high efficiency dephosphorating processing of high-phosphor oolitic hematite, the reduction rate of gained reduced iron powder is higher, and easy to operate, process
It is short.
2. technical solution
In order to achieve the above objectives, technical solution provided by the invention is：
A kind of method of high-phosphorus hematite microwave reduction-magnetic separation dephosphorization of the invention, includes the following steps：
(1) water is added to mix according to a certain percentage high-phosphorus hematite powder, reducing agent, bonding agent, Dephosphorising agent and composite catalyst
Merge and carry out pelletizing, perforation processing is carried out to pelletizing later and dries；
(2) pelletizing after drying is placed in microwave oven and carries out heating reduction and dephosphorization treatment, obtain reduction bead；
(3) continue to be put into conical ball mill after being smashed and ground the bead after reduction and add water fine grinding；
(4) the reduction ore pulp obtained after fine grinding is subjected to magnetic separation processing to get high-quality Iron concentrate is arrived.
Further, the diameter that institute's pelletizing is rolled into a ball in step (1) is 10~20mm, and is used before drying and processing
Pecker carries out perforation processing to pelletizing, and pelletizing surface punching rate is 5~8 holes/cm2。
Further, microwave heating system is first heated to 900 DEG C from room temperature in the step (2), control heating speed
Rate is 17~20 DEG C/min, is then warming up to 1100~1250 DEG C from 900 DEG C, and heating rate is 10~13 DEG C/min, it is subsequent
Cooling is taken out after continuation of insurance 3~15min of temperature.
Further, pelletizing is covered using carbon granules when carrying out heating reduction in step (2), and the ball after restoring will be heated
Group is immediately placed on progress hot-quenching processing in hot water after taking out.
Further, the proportion of the high-phosphorus hematite powder and reducing agent is 1 by weight:0.1~0.18, and making
It is 0.4~1.2 that addition CaO, which adjusts the basicity of pelletizing, when ball processing.
Further, the reducing agent is made full use of using the mixed coal powder of anchracite duff and coconut husk carbon dust composition
The excellent microwave absorbing property of anthracitic high fixed carbon content and coconut carbon, to promote reduction process, and anchracite duff and coconut palm
The mass ratio of shell carbon dust is (3~3.5):1.
Further, the bonding agent selects Na2SiO3·9H2O, additive amount for institute's pelletizing roll into a ball gross weight 3%~
5%.
Further, the composite catalyst is the mixture of borax and alkali metal salt, and additive amount is institute's pelletizing
The 1%~5% of group's gross weight.
Further, the Dephosphorising agent is Na2CO3、Na2SO4、NaCl、CaCl2、Ca(OH)2One of or it is more
Kind, additive amount rolls into a ball the 5%~10% of gross weight for institute's pelletizing.
Further, grinding time is 4~5min in the step (3), and granularity is more than less than 0.02mm after crushing
90%, continue in conical ball mill later plus water grinds 10~20min；Wine is added in reduction ore pulp in the step (4)
Magnetic separation is carried out after smart solution rinse again, magnetic separation strength is controlled in 50~100mT.
3. beneficial effect
Using technical solution provided by the invention, compared with prior art, there is following remarkable result：
(1) method of a kind of high-phosphorus hematite microwave reduction-magnetic separation dephosphorization of the invention, by high-phosphorus hematite powder with
It is placed in microwave oven and carries out at heating together after reducing agent, bonding agent, Dephosphorising agent and composite catalyst progress mixed pelletizing
Reason, by means of the selectivity of microwave heating, is heated mineral facies preferentially, so as to which the phosphorus in high-phosphorus hematite is effectively reduced
Content, and the reduction rate of iron in mineral facies is improved, guarantee the Iron grade of gained reduced iron powder product.
(2) method of a kind of high-phosphorus hematite microwave reduction-magnetic separation dephosphorization of the invention, pelletizing is after the completion to pelletizing
Perforation processing is carried out, and controlling pelletizing surface punching rate is 5-8 hole/cm2, so that pelletizing internal-response on the one hand can be improved
The diffusion conditions of reducing gas in the process promote the abundant reduction of iron inside pelletizing, on the other hand can make in reduction process
The gas P of generation directly escapes pelletizing along pelletizing inner void, guarantees that dephosphorization is more thorough.In addition, subsequent to reduction bead
When carrying out break process, since the loose and porous structure of pelletizing to be crushed simple and easy, energy consumption is advantageously reduced.
(3) method of a kind of high-phosphorus hematite microwave reduction-magnetic separation dephosphorization of the invention, first by microwave heating system
900 DEG C are heated to from room temperature, control heating rate is 17~20 DEG C/min, and 1100~1250 DEG C are then warming up to from 900 DEG C, is risen
Warm rate is 10~13 DEG C/min, takes out cooling after continuing 3~15min of heat preservation later, adds by using microwave heating, and to it
Thermal process optimizes, so that the abundant reduction of iron in mineral facies on the one hand can be promoted, and advantageously reduces reduction temperature
Degree improves rate of reduction, on the other hand Fe/P phase interface can be promoted sufficiently to dissociate, to be conducive to further increase going for P
Except effect, realization reduced iron powder product is sufficiently separated with rich phosphorus slag.
(4) method of a kind of high-phosphorus hematite microwave reduction-magnetic separation dephosphorization of the invention make when heating reduction
Pelletizing is covered with carbon granules, to be conducive to the abundant reduction of iron in mineral facies, is set immediately after the pelletizing after heating reduction is taken out
Hot-quenching processing is carried out, in hot water so as to promote it to be completely separated so that metallic particles and gangue generate rapidly crack.
(5) method of a kind of high-phosphorus hematite microwave reduction-magnetic separation dephosphorization of the invention, by high phosphorus in pelletizing
The proportion of ground hematite and reducing agent, the type of reducing agent and the basicity of gained pelletizing optimize control, to be conducive to
It is further ensured that the abundant reduction of iron, the full Iron grade of final gained reduced iron powder is greater than 90%.In addition, by adding into pelletizing
The mixture of the borax and alkali metal salt that add certain content is as catalyst, to advantageously reduce reaction activity, makes total
Carbothermic reduction reaction is accelerated.
Detailed description of the invention
Fig. 1 is the XRD diagram of iron powder after magnetic separation in embodiment 1；
Fig. 2 is the XRD diagram of non magnetic slag after magnetic separation in embodiment 1.
Specific embodiment
The present invention primarily directed to using existing dephosphorization technology to high-phosphorus hematite handled existing for dephosphorization effect phase
The problems such as lower to poor, gained reduced iron powder Iron grade, inventor is by many experiments, finally also using microwave heating
Original-magnetic selection method, and by pelletizing carry out perforation processing and reasonable technological parameter configure, while cooperate composite catalyst and
The collective effect of Dephosphorising agent, so as to realize going back for iron in ore oxide while phosphorus ore containing reduction is effectively reduced
Original, later period realize efficiently separating for iron and phosphorus by way of magnetic separation, obtain full Iron grade greater than 90%, phosphorus content is lower than
0.2% concentrate powder.
Wherein, the present invention is by selecting microwave heating, and optimizes to heating process, so as to so that material is micro-
Area obtains quick energy accumulation, so that the valuable mineral in mineral is preferentially heated, causes complex ore system temperature aobvious
Uneven distribution on micro- ruler is formed " hot spot ", is macroscopically being shown as reducing reduction temperature, is being accelerated reduction reaction rate, strong
Change the reduction of metalliferous mineral in inclusion enclave, improve degree of metalization；Shown as on microcosmic two-phase interface formed crack and fragment,
Promote ore phase reconstruction, inclusion enclave is promoted to dissociate.Specifically, the temperature increasing schedule different by using front and back, on the one hand can subtract as far as possible
The loss of few reducing agent, and material is made to enter core reaction temperature as early as possible, on the other hand also ensure the optimum response speed of material
Rate, and ensure that the abundant reaction of material.Therefore, the present invention utilizes microwave heating, advantageously reduces reduction temperature, improves reduction
Rate promotes iron crystal grain to grow up, Fe/P phase interface is promoted to dissociate, to realize the efficient removal of phosphorus, obtains reduced iron powder product
With rich phosphorus slag.In addition, on the one hand the present invention improves pelletizing internal-response in the process also by having carried out perforation processing to pelletizing
The diffusion conditions of raw-gas, the gas P generated in another aspect reduction process can directly escape pelletizing along pelletizing inner void,
Dephosphorization is more thorough.Furthermore in the subsequent bead progress break process to reduction, since the loose and porous structure of pelletizing to be crushed
It is simple and easy, energy consumption can be reduced.The present invention has that rate of reduction is fast, the time is short, degree of metalization is high, dephosphorization compared with prior art
The advantages such as significant effect, pelletizing comminution energy conssumption be low.
To further appreciate that the contents of the present invention, now in conjunction with specific embodiment, the present invention is described in detail.
Embodiment 1
Certain high-phosphor oolitic hematite stone iron content 43%, phosphorus content 0.87%, phosphorus is mainly stored in collophane.The high-phosphor oolitic
For high-phosphorus hematite, (anchracite duff and coconut husk carbon dust press 3 to the material proportion of hematite reduction with mixed coal powder:1 mixing) match
Than being by weight 1:0.1, basicity is：0.4, the proportion of binder be by weight percentage for 4%, the proportion of Dephosphorising agent be by
Weight percent is 7.5%, and the type of Dephosphorising agent is Na2CO3、CaCl2By 1:1 mixing, composite catalyst are by weight percentage
3%, density of such perforation is 5 holes/cm2.The pelletizing made is placed in microwave oven and is first heated to 900 DEG C from room temperature, control
Heating rate is 17 DEG C/min, and 1100 DEG C are then warming up to from 900 DEG C, and heating rate is 10 DEG C/min, continues to keep the temperature later
It is taken out after 10min and is immediately placed on progress hot-quenching processing in hot water, consequently facilitating the pulverization process of subsequent pelletizing and promotion slag iron point
From effect.The bead after reduction is put into material crusher again and grinds 5min, water mill mine 10min is added in conical ball mill,
Products obtained therefrom carries out magnetic separation under conditions of magnetic field strength is 75mT, can obtain Iron grade 90.2%, phosphorus content 0.12%
Reduced iron powder.The object phase composition of gained reduced iron powder and non magnetic slag after Reduced separating is analyzed, as a result as shown in Figure 1, Figure 2
It is shown, the results showed that, preferable separating effect, gained has been obtained in iron in iron ore and phosphorus after this process
The reduced iron powder purity arrived is higher, and substantially without what impurity, and most of phosphorus is then in the form of phosphate as gangue is detached from
It goes out.
Embodiment 2
Certain high-phosphor oolitic hematite stone iron content 43%, phosphorus content 0.87%, phosphorus is mainly stored in collophane.The high-phosphor oolitic
For high-phosphorus hematite, (anchracite duff and coconut husk carbon dust press 3.5 to the material proportion of hematite reduction with mixed coal powder:1 mixing)
Proportion is 1 by weight:0.15, basicity is：1.0, the proportion of binder is by weight percentage the proportion of Dephosphorising agent for 4%
Be is 7.5% by weight percentage, and the type of Dephosphorising agent is Na2CO3, composite catalyst is 5% by weight percentage, is perforated close
Degree is 6 holes/cm2.The pelletizing made is placed in microwave oven and is first heated to 900 DEG C from room temperature, control heating rate is
19 DEG C/min, 1200 DEG C are then warming up to from 900 DEG C, heating rate is 12 DEG C/min, and it is vertical to continue taking-up after keeping the temperature 15min later
It is placed in progress hot-quenching processing in hot water.The bead after reduction is put into material crusher again later and grinds 5min, in taper
Ore grinding 16min in ball mill, products obtained therefrom magnetic separation under conditions of magnetic field strength is 50mT, can obtain Iron grade 95.4%,
The reduced iron powder of phosphorus content 0.18%.
Embodiment 3
Certain high-phosphor oolitic hematite stone iron content 46.4%, phosphorus content 0.69%, phosphorus is mainly stored in fluor-apatite.The high phosphorus
For high-phosphorus hematite, (anchracite duff and coconut husk carbon dust press 3.2 to the material proportion of oolitic hematite stone reduction with coal dust:1 mixing)
Proportion is 1 by weight:0.18, basicity is：1.2, the proportion of binder is by weight percentage the proportion of Dephosphorising agent for 3%
Be is 5% by weight percentage, and the type of Dephosphorising agent is CaCl2And Na2SO4, by 4:1 mixing, composite catalyst percentage by weight
Than being 2%, density of such perforation is 8 holes/cm2.The pelletizing made is placed in microwave oven and is first heated to 900 DEG C from room temperature,
Control heating rate is 20 DEG C/min, 1250 DEG C is then warming up to from 900 DEG C, heating rate is 13 DEG C/min, later after continuation of insurance
It is taken out after warm 3min and is immediately placed on progress hot-quenching processing in hot water.The bead after reduction is put into material crusher again and is ground
4min, the ore grinding 20min in conical ball mill, products obtained therefrom magnetic separation under conditions of magnetic field strength is 100mT, can obtain iron
Grade 93.5%, the reduced iron powder of phosphorus content 0.13%.
Embodiment 4
Certain high-phosphor oolitic hematite stone iron content 43%, phosphorus content 0.87%, phosphorus is mainly stored in fluor-apatite.The high phosphorus roe
For high-phosphorus hematite, (anchracite duff and coconut husk carbon dust press 3 to the material proportion of shape hematite reduction with coal dust:1 mixing) proportion
It is by weight 1:0.12, basicity is：0.8, the proportion of binder be by weight percentage for 5%, the proportion of Dephosphorising agent be by
Weight percent is 10%, and the type of Dephosphorising agent is NaCl and Na2SO4, by 1:1 mixing, composite catalyst is by weight percentage
It is 5%, density of such perforation is 8 holes/cm2.The pelletizing made is placed in microwave oven and is first heated to 900 DEG C from room temperature, control
Heating rate processed is 20 DEG C/min, and 1180 DEG C are then warming up to from 900 DEG C, and heating rate is 11 DEG C/min, continues to keep the temperature later
It is taken out after 8min and is immediately placed on progress hot-quenching processing in hot water.The bead after reduction is put into material crusher again and is ground
4min, the ore grinding 12min in conical ball mill, products obtained therefrom magnetic separation under conditions of magnetic field strength is 75mT, can obtain iron
Grade 92.4%, the reduced iron powder of phosphorus content 0.093%.
Claims (10)
1. a kind of method of high-phosphorus hematite microwave reduction-magnetic separation dephosphorization, which is characterized in that include the following steps：
(1) water is added to mix simultaneously according to a certain percentage high-phosphorus hematite powder, reducing agent, bonding agent, Dephosphorising agent and composite catalyst
Pelletizing is carried out, perforation processing is carried out to pelletizing later and is dried；
(2) pelletizing after drying is placed in microwave high temperature heating furnace and carries out heating reduction and dephosphorization treatment, obtain reduction bead；
(3) continue to be put into conical ball mill after being smashed and ground the bead after reduction and add water fine grinding；
(4) the reduction ore pulp obtained after fine grinding is subjected to magnetic separation processing to get high-quality Iron concentrate is arrived.
2. a kind of method of high-phosphorus hematite microwave reduction-magnetic separation dephosphorization according to claim 1, feature exist
In：The diameter that institute's pelletizing is rolled into a ball in step (1) is 10~20mm, and is carried out using pecker to pelletizing before drying and processing
Perforation processing, pelletizing surface punching rate are 5~8 holes/cm2。
3. a kind of method of high-phosphorus hematite microwave reduction-magnetic separation dephosphorization according to claim 1, feature exist
In：Microwave heating system is first heated to 900 DEG C from room temperature in the step (2), control heating rate is 17~20 DEG C/min,
Then 1100~1250 DEG C are warming up to from 900 DEG C, heating rate is 10~13 DEG C/min, is taken after continuing 3~15min of heat preservation later
It cools down out.
4. a kind of method of high-phosphorus hematite microwave reduction-magnetic separation dephosphorization according to claim 3, feature exist
In：Pelletizing is covered using carbon granules when carrying out heating reduction in step (2), and is immediately placed on after the pelletizing after heating reduction is taken out
Hot-quenching processing is carried out in hot water.
5. a kind of method of high-phosphorus hematite microwave reduction-magnetic separation dephosphorization described in any one of -4 according to claim 1,
It is characterized in that：The proportion of the high-phosphorus hematite powder and reducing agent is 1 by weight:0.1~0.18, and in pelletizing processing
Adding CaO and adjusting the basicity of pelletizing is 0.4~1.2.
6. a kind of method of high-phosphorus hematite microwave reduction-magnetic separation dephosphorization according to claim 5, feature exist
In：The mixed coal powder that the reducing agent is formed using anchracite duff and coconut husk carbon dust, and the matter of anchracite duff and coconut husk carbon dust
Amount is than being (3~3.5):1.
7. a kind of method of high-phosphorus hematite microwave reduction-magnetic separation dephosphorization described in any one of -4 according to claim 1,
It is characterized in that：The bonding agent selects Na2SiO3·9H2O, additive amount roll into a ball the 3%~5% of gross weight for institute's pelletizing.
8. a kind of method of high-phosphorus hematite microwave reduction-magnetic separation dephosphorization described in any one of -4 according to claim 1,
It is characterized in that：The composite catalyst is borax and alkali metal salt obtains mixture, and additive amount rolls into a ball gross weight for institute's pelletizing
1%~5%.
9. a kind of method of high-phosphorus hematite microwave reduction-magnetic separation dephosphorization described in any one of -4 according to claim 1,
It is characterized in that：The Dephosphorising agent is Na2CO3、Na2SO4、NaCl、CaCl2、Ca(OH)2One of or it is a variety of, addition
Measure roll into a ball gross weight for institute's pelletizing 5%~10%.
10. a kind of side of high-phosphorus hematite microwave reduction-magnetic separation dephosphorization described in any one of -4 according to claim 1
Method, it is characterised in that：Grinding time is 4~5min in the step (3), and it is more than 90% that granularity, which is less than 0.02mm, after crushing,
Continue in conical ball mill later plus water grinds 10~20min；Alcoholic solution is added in reduction ore pulp in the step (4)
Magnetic separation is carried out after rinse again, magnetic separation strength is controlled in 50~100mT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810835704.9A CN108893601B (en) | 2018-07-26 | 2018-07-26 | Microwave heating reduction-magnetic separation dephosphorization method for high-phosphorus hematite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810835704.9A CN108893601B (en) | 2018-07-26 | 2018-07-26 | Microwave heating reduction-magnetic separation dephosphorization method for high-phosphorus hematite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108893601A true CN108893601A (en) | 2018-11-27 |
| CN108893601B CN108893601B (en) | 2020-01-10 |
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| CN110066915A (en) * | 2019-04-25 | 2019-07-30 | 西安建筑科技大学 | A kind of method that calcining magnetic separation removes phosphorus in high-phosphor oolitic hematite |
| CN110255628A (en) * | 2019-05-24 | 2019-09-20 | 中南民族大学 | The method that high-phosphor oolitic hematite prepares high-purity polymeric ferric sulfate flocculant |
| CN111378831A (en) * | 2020-05-15 | 2020-07-07 | 华北理工大学 | Use method of pore-forming composite additive for dephosphorization of high-phosphorus iron ore pellets |
| CN111411218A (en) * | 2020-05-15 | 2020-07-14 | 华北理工大学 | Pore-forming composite additive for dephosphorization of high-phosphorus iron ore pellets, addition method and preparation method thereof |
| CN113283707A (en) * | 2021-04-27 | 2021-08-20 | 安徽安纳达钛业股份有限公司 | Method for determining mixing ratio of high-phosphorus titanium ore and common titanium ore |
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| CN111411218B (en) * | 2020-05-15 | 2021-07-30 | 华北理工大学 | Pore-forming composite additive for dephosphorization of high-phosphorus iron ore pellets, addition method and preparation method thereof |
| CN113283707A (en) * | 2021-04-27 | 2021-08-20 | 安徽安纳达钛业股份有限公司 | Method for determining mixing ratio of high-phosphorus titanium ore and common titanium ore |
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