阅读说明：本技术 基于电磁感应的磁铁矿无碳烧结方法 (The carbon-free sintering method of magnetic iron ore based on electromagnetic induction ) 是由 吕学伟 周炫庚 向俊一 游志雄 党杰 辛云涛 余文轴 于 2019-09-12 设计创作，主要内容包括：本发明提供基于电磁感应的磁铁矿无碳烧结方法,包括S1原料准备：原材料为钒钛磁铁矿和添加料,往钒钛磁铁矿中加入适量的添加料,然后将钒钛磁铁矿与添加料进行混料；S2对S1中的混料进行压球；S2焙烧：将S2得到的压块在电磁感应炉内进行热处理,在一定的焙烧条件下进行焙烧,对加热完毕的烧结矿料进行空冷。通过采用电磁感应烧结,不用配碳,可以减少C、S等氧化物的排放,减少环境污染。通过采用压球工艺,相比现有的烧结工艺,可以增大反应物接触面积,提高反应物的反应性和成品,降低了烧结的返矿率,减少了能量消耗,节约能源,降低成本。(The present invention provides the carbon-free sintering method of magnetic iron ore based on electromagnetic induction, including S1 raw material preparation: raw material are vanadium titano-magnetite and additive, and suitable additive is added into vanadium titano-magnetite, and vanadium titano-magnetite and additive are then carried out mixing；S2 carries out pressure ball to the mixing in S1；S2 roasting: the briquetting that S2 is obtained is heat-treated in electromagnetic induction furnace, is roasted under certain roasting condition, is carried out to the sintered ore materials that heating finishes air-cooled.It is sintered by using electromagnetic induction, does not have to match carbon, it is possible to reduce the discharge of the oxides such as C, S reduces environmental pollution.By using ball press technique, existing sintering process is compared, reactant contact area can be increased, the reactivity and finished product of reactant is improved, reduce the rate of return mine of sintering, reduce energy consumption, it is energy saving, reduce cost.)

1. the carbon-free sintering method of magnetic iron ore based on electromagnetic induction, it is characterised in that: the following steps are included:

S1: raw material preparation: raw material are vanadium titano-magnetite and additive, suitable additive are added into vanadium titano-magnetite, so Vanadium titano-magnetite and additive are subjected to mixing afterwards；

S2: briquetting processing is carried out to the mixture in S1, obtains pressure ball；

S2: heat treatment: the pressure ball that S2 is obtained is heat-treated using electromagnetic induction furnace, is roasted under certain roasting condition It burns, the sinter that heating finishes is carried out air-cooled.

2. the carbon-free sintering method of the magnetic iron ore according to claim 1 based on electromagnetic induction, it is characterised in that: the addition Material is iron powder or calcium ferrite.

3. the carbon-free sintering method of the magnetic iron ore according to claim 2 based on electromagnetic induction, it is characterised in that: in the S1 The additive amount of iron powder is the 7.7%~12.2% of mixing total amount.

4. the carbon-free sintering method of the magnetic iron ore according to claim 2 based on electromagnetic induction, it is characterised in that: in the S1 The additive amount of calcium ferrite is 18.52%-25.5%.

5. according to the carbon-free sintering method of the described in any item magnetic iron ores based on electromagnetic induction of claim 2-4, it is characterised in that: Calcium oxide is added in the S1 into mixing to adjust the basicity R of mixing between 1.7-2.5.

6. according to the carbon-free sintering method of the described in any item magnetic iron ores based on electromagnetic induction of claim 2-5, it is characterised in that: Heat treatment condition is in the S3: holding temperature is 1200 DEG C -1250 DEG C, and soaking time is 8~15min.

7. the carbon-free sintering method of the magnetic iron ore according to claim 2 based on electromagnetic induction, it is characterised in that:

The production of the calcium ferrite includes following process flow:

A. pure di-iron trioxide and calcium oxide raw material are carried out according to the ratio that molar ratio is 1:1 uniformly mixed；

B. by the di-iron trioxide and calcium oxide raw material progress briquetting after mixing, so that the pressure ball of same size be made；

C. pressure ball obtained is heat-treated, after finishing, takes out product, so that it is carried out natural cooling, calcium ferrite can be obtained；

D. the calcium ferrite prepared is clayed into power shape calcium ferrite using vibration equipment.

Technical field

The present invention relates to magnetic iron ore sintering technology fields, the specially carbon-free sintering method of the magnetic iron ore based on electromagnetic induction.

Background technique

Sintering is to be incorporated suitable fuel and flux, suitable water is added, mixed and made various powdery iron-containing raw materials Make material that a series of physical chemical change occur after ball on agglomerating plant, mineral powder granular is sticked into caked process, is steel One important link of production technology, sinter main function is that stable components are provided for blast furnace in the steel industry, and granularity is equal The high high-quality furnace charge of even, Well-recovered metallurgical performance, so that strengthening smelting process, is the high yield of blast furnace, high-quality, low consumption creation is good Good condition.

Existing sintering process process is that " raw material preparation-ingredient-mixing, granulation-cloth-igniting, heat preservation-sintering-heat are broken Broken-cooling-broken, whole grain, screening-detection ", with when generation technique development, sintering technology also continuously improves, developed The sintering technology of many maturations: high-basicity sintering technology, pellet sintering technology, Mini-pelletized Sintering Process, low-temperature sintering technology, low Silicon sintering technology etc., although existing sintering and these mature sintering technologies have the advantage that and are widely used by the country, its There are still deficiencies:

1) sintering process energy consumption is high, and foreign countries compare, and the pre- heat utilization efficiency of domestic sintered discharge gas is lower, especially useless to large flue Gas and the cold low temperature waste gas heat utilization of ring are insufficient, while sintering machine and ring cold machine leak out higher, and igniting system is unreasonable, makes to burn Knot power consumption increases；

2) sintered pollutant discharge amount is big, and existing sintering technology can generate a series of atmosphere pollution using coke powder as fuel Object, design effect is not achieved due to desulfurization technology in the flue gas desulfurization device of some techniques now in addition, leads to pollutant It discharges excessive；

3) it is crushed and is generated with rubble, pulverization rate is high, and the rate of return mine is caused to increase, and promotes cost.

Summary of the invention

(1) the technical issues of solving

In view of the deficiencies of the prior art, the present invention provides the carbon-free sintering methods of magnetic iron ore based on electromagnetic induction, solve Igniting system is unreasonable, makes to be sintered power consumption and increase, and sintered pollutant discharge amount is big, is crushed and generates with rubble, pulverization rate The problem of height causes the rate of return mine to increase, and promotes cost.

(2) technical solution

In order to achieve the above object, the present invention is achieved by the following technical programs: based on the magnetic iron ore of electromagnetic induction without Carbon sintering method, it is characterised in that: the following steps are included:

S1: raw material preparation: raw material are vanadium titano-magnetite and additive, and suitable addition is added into vanadium titano-magnetite Material then by vanadium titano-magnetite and addition abrasive lapping, and is uniformly mixed；

S2: briquetting processing is carried out to the mixture in S1, obtains pressure ball；

S2: heat treatment: pressure ball that S2 is obtained merging electromagnetic induction furnace is heat-treated, under certain roasting condition into Row roasting carries out the sintered ore materials that heating finishes air-cooled.

As an improvement, the additive is iron powder or calcium ferrite.Addition iron powder can increase the electric conductivity of sinter mixture, So that sinter mixture generates strong vortex under electromagnetic induction action of alternating magnetic field, and then make spontaneous inside sinter mixture Heat, to achieve the effect that more preferably to heat；The purpose of addition calcium ferrite is burnt to improve the intensity of sinter, reproducibility etc. One of target of knot is that more calcium ferrites by prefabricated calcium ferrite can reach raising to a certain extent in order to obtain The purpose of sinter strength, reproducibility.

As an improvement, the additive amount of iron powder is the 7.7%~12.2% of mixing total amount in the S1.The cost of iron powder compared with It is expensive, in order to which save the cost is without impact effect, select selected range.Iron powder additive amount is very few, and the effect of spontaneous heating is not achieved, adds Dosage is excessive, is likely to result in superfusion, to influence actual effect.

As an improvement, the additive amount of calcium ferrite is 18.52%-25.5% in the S1.The additive amount of calcium ferrite is according to alkali Spend with addition of, by calculating come.The ratio that the preparation of calcium ferrite is 1:1 according to the molar ratio of di-iron trioxide and calcium oxide Preparation, according to the calcium oxide content and dioxide-containing silica of basicity and vanadium titano-magnetite, can directly calculate need with addition of iron Sour calcium.

The basicity R of mixing is adjusted between 1.7-2.5 as an improvement, adding calcium oxide in the S1 into mixing.

As an improvement, heat treatment condition is in the S3: holding temperature be 1200 DEG C -1250 DEG C, soaking time be 8~ 15min。

As an improvement, the production of the calcium ferrite includes following below scheme:

A. pure di-iron trioxide and calcium oxide raw material are carried out according to the ratio of 1:1 uniformly mixed；

B. by the di-iron trioxide and calcium oxide raw material progress briquetting after mixing, so that the pressure ball of same size be made；

C. pressure ball obtained is heat-treated, after finishing, takes out product, so that it is carried out natural cooling, iron can be obtained Sour calcium；

D. the calcium ferrite prepared is ground using vibration equipment, shape calcium ferrite of being clayed into power.

(3) beneficial effect

The present invention provides the carbon-free sintering methods of magnetic iron ore based on electromagnetic induction.Have it is following the utility model has the advantages that

1, it is somebody's turn to do the carbon-free sintering method of magnetic iron ore based on electromagnetic induction, is sintered by using electromagnetic induction, does not have to match carbon, it can To reduce the discharge of the oxides such as C, S, reduce environmental pollution.

2, it is somebody's turn to do the carbon-free sintering method of magnetic iron ore based on electromagnetic induction, by using preloading block technique, compared to traditional burning Knot technique can increase reactant contact area, improve the reactivity and finished product of reactant, reduce the rate of return mine of sintering, subtract Lack energy consumption, it is energy saving, reduce cost.

3, it is somebody's turn to do the carbon-free sintering method of magnetic iron ore based on electromagnetic induction and passes through alternation magnetic by using electromagnetic induction heating Field makes metallic conductor generate inductive loop, and metallic conductor fever is that one kind can be from metallic conductor to achieve the purpose that heating A kind of heating method of inner heat, roasting effect are more preferable.

4, it is somebody's turn to do the carbon-free sintering method of magnetic iron ore based on electromagnetic induction, by addition iron powder, reinforces the effect of induction heating, It can promote solid phase reaction.

Detailed description of the invention

Fig. 1 is the flow chart for preparing calcium ferrite.

Fig. 2 is the general flow chart of the method for the present invention.

Fig. 3 is not plus iron powder sintering sample X-ray diffraction object mutually detects.

Fig. 4 is that addition iron powder sintering sample X-ray diffraction object mutually detects.

Fig. 5 is the mine phase microstructure for adding iron powder sample, and wherein picture a indicates 50 times of amplification, and picture b indicates amplification 100 times, picture c indicates 200 times of amplification, and picture d indicates 500 times of amplification.

Fig. 6 is to be not added with iron powder sample mineral phase structure, and wherein picture a indicates 50 times of amplification, and picture b indicates 100 times of amplification, Picture c indicates 200 times of amplification, and picture d indicates 500 times of amplification.

Fig. 7 is sinter intensity test result.

With addition of the XRD spectrum of calcium ferrite under the conditions of tri- kinds of Fig. 8 R=1.7, R=2.1, R=2.5 basicity.

Fig. 9 is the XRD spectrum under the conditions of tri- kinds of basicity of R=1.7, R=2.1, R=2.5 with addition of calcium oxide.

Figure 10 is R=1.7 magnetic iron ore with addition of calcium oxide experiment mine phase result.

Figure 11 is R=1.7 magnetic iron ore with addition of calcium ferrite mine phase result.

Figure 12 is R=2.1 magnetic iron ore with addition of calcium oxide mine phase result.

Figure 13 is R=2.1 magnetic iron ore with addition of calcium ferrite mine phase result.

Figure 14 is R=2.5 magnetic iron ore with addition of calcium oxide mine phase result.

Figure 15 is R=2.5 magnetic iron ore with addition of calcium ferrite mine phase result.

Specific embodiment

Below in conjunction with multiple embodiments in the present invention, technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.

The carbon-free sintering method of magnetic iron ore based on electromagnetic induction, comprising the following steps:

S1: raw material preparation: raw material are vanadium titano-magnetite and additive, and suitable iron powder is added into vanadium titano-magnetite, It is ground, and is uniformly mixed, the basicity of the mixing is R1.7-2.5；

S2: pressure ball processing, pressure ball are carried out to the mixing in S1；

S2: roasting: the briquetting that S2 is obtained is heat-treated, and is roasted under certain roasting condition, to having heated Complete sintered ore materials carry out air-cooled.

Following embodiment is mainly the choosing to basicity, CaO additive amount, additive, the additive amount of additive and roasting condition Difference is selected, is tabulated to save length.

In table 1-1, raw material is tested for convenience using vanadium titano-magnetite, weighs vanadium titano-magnetite 36g.

Table 1-1

Comparative example

In table 1-2, raw material is tested for convenience using vanadium titano-magnetite, weighs vanadium titano-magnetite 40g.

Table 1-2

Interpretation of result:

As shown in figure 3, the main object of iron powder sample is not added to be mutually ferroso-ferric oxide, ferrous oxide and perovskite.Due to burning The generation of ideal bonding phase calcium ferrite need to pass through Fe in knot mine₂O₃Participation, Fe₃O₄It cannot directly be reacted with CaO and generate ferrous acid Calcium, therefore the characteristic peak of calcium ferrite is not detected in XRD result, while it is weaker also to have reacted sintering oxidation atmosphere, vanadium titanium Magnet mineral facies are still retained after experienced sintering process.Due in vanadium titano-magnetite titanium mainly with ilmenite (FeTiO₃) shape Formula exists, and during the sintering process, reacts with quick lime and generates perovskite and ferrous oxide, reacts as follows:

FeO·TiO₂+ CaO=CaOTiO₂+FeO

And then explain the presence of perovskite and ferrous oxide in XRD result.

As shown in figure 4, the addition main object of iron powder sample is mutually ferrous oxide, perovskite, magnetic iron ore and iron powder.

Iron powder generates fuel factor during induction sintering, provides partial heat for the sintering of vanadium titano-magnetite；Meanwhile iron Powder plays the role of reducing agent, and comproportionation reaction occurs with magnetic iron ore and generates ferrous oxide, reaction: Fe₃O₄+ Fe=4FeO.

Since sintering time is limited, still nubbin iron powder in sample, by metallographic microscope observe it is provable should Phenomenon.In mine is mutually observed, it can be observed that the generation of a small amount of calcium ferrite, and in XRD analysis, the life of calcium ferrite is not detected At reason may be that the amount of generation is less.

Fig. 5 is the mine phase microstructure for adding iron powder sample, and main object is mutually magnetic iron ore, olivine, calcium ferrite and remnants Iron powder.Wherein magnetic iron ore takes on a red color, and olivine is in Dark grey, and calcium ferrite is in cinerous, and iron powder is white.Sinter strength is main By the crystal stock effect and the bonding effect of olivine phase of magnetic iron ore.

When using iron powder as additive, holding temperature is set as 1200 degrees centigrades, this is because being more than this Probably there is phenomenon of superfusing in temperature, and is unfavorable for roasting.

In table 2-1, raw material is tested for convenience using vanadium titano-magnetite, weighs vanadium titano-magnetite 40g.

Table 2-1

When using calcium ferrite as additive, compared to iron powder as additive, holding temperature can be suitably submitted, this is Because the fusing point of one calcium of ferrous acid is 1217 DEG C, properly increases holding temperature and be conducive to roast, preferably holding temperature is 1250 DEG C.

In table 2-2, raw material is tested for convenience using vanadium titano-magnetite, weighs vanadium titano-magnetite 40g.

Table 2-2

Sinter intensity test

It can be seen that strength relationship from intensity test result are as follows: addition calcium ferrite > addition iron powder > blank group, and It can achieve certain intensity using the sinter that electromagnetic induction sintering technology is made as the result is shown.Illustrate based on electromagnetic induction The carbon-free sintering method of magnetic iron ore can also obtain with the consistent effect of existing sintering technology, the pulverization rate of sinter is controlled one A reasonable interval range, after adding iron powder, it is higher that sinter strength is relatively not added with iron powder, illustrates that resistance to compression can be made by adding iron powder Intensity improves.It is as shown in Figure 7 using compression strength curve made from Origin.

Different basicity conditions are with addition of calcium ferrite, calcium oxide experimental result

XRD material phase analysis

Obtained XRD spectrum is as shown in Figure 8, Figure 9, from the point of view of obtained XRD spectrum, characteristic peak quantity it is most be Fe₃O₄, secondly it is CaTiO₃, XRD that Fig. 9 is shown.

The CaTiO of map₃What quantity was shown more than Fig. 8.In addition, it has been found that a small amount of CF, C₂F, the characteristic peak of FeO.

Sample mine mine phase microstructure analysis

Referring to Figure 10-Figure 15, microstructure figure in: H: bloodstone；M: magnetic iron ore；CF: one calcium of ferrous acid；C2F: iron Sour dicalcium；S: the nature of glass；K: it is mainly magnetic iron ore that hole, which can be seen that mine phase composition from microstructure figure, and there are crystal faces In porous state, mine mutually has CF, C as the result is shown₂F, bloodstone exists, Fe in sinter₃O₄It is cementing by silicate.

Conclusion: utilizing electromagnetic induction phenomenon, on the one hand can reach with the consistent effect of existing sintering technology, while can drop Low energy consumption, the discharge for reducing nuisance, specific as follows:

(1) the main object of mine phase microstructure is mutually magnetic iron ore, olivine, calcium ferrite and remaining iron powder.Wherein magnetic iron ore is in Red, olivine are in Dark grey, and calcium ferrite is in cinerous, and iron powder is white.Sinter strength is made mainly by the crystal stock of magnetic iron ore With and olivine phase bonding effect；

(2) sinter that compression strength is obtained using electromagnetic induction technology can equally make sinter reach preferable strong Degree.Also, it is sintered with addition of iron powder, can reach the effect for improving sinter strength；

Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention Art scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at this In the scope of the claims of invention.