阅读说明：本技术 一种基于还原焙烧回收制备精铁粉的方法及系统 (It is a kind of to recycle the method and system for preparing smart iron powder based on reduction roasting ) 是由 罗立群 郑波涛 魏晨曦 周鹏飞 于 2019-08-31 设计创作，主要内容包括：本发明公开了一种基于还原焙烧回收制备精铁粉的方法及系统,该方法步骤包括含铅锌难选铁物料预处理、还原焙烧、绝氧水淬和磨矿磁选,其中：所述含铅锌难选铁物料预处理步骤包括：将含铅锌难选铁物料与还原剂破碎细化后混合均匀,得到混合原料,且所述混合原料中所述还原剂的质量百分数为1％～30％；所述还原焙烧步骤包括：还原炉升温至还原温度后,将所述混合原料迅速放至所述还原炉中进行还原焙烧,得到还原物料,所述还原温度为1100℃～1250℃,还原焙烧时间为10min～3h。本发明通过该方法有效同步脱去含铅锌难选铁物料中的铅和锌,使所得精铁粉中铅锌杂质含量显著降低,进而使精铁粉品位显著提高；同时制备工艺简捷,使高炉寿命延长且炼铁效益提升。(The invention discloses a kind of method and system that the smart iron powder of preparation is recycled based on reduction roasting, this method step includes that leaded zinc difficulty selects the pretreatment of iron material, reduction roasting, anoxybiotic water quenching and mill ore magnetic selection, wherein: it includes: to be uniformly mixed after leaded zinc difficulty is selected iron material and the broken refinement of reducing agent that the leaded zinc difficulty, which selects iron material pre-treatment step, mixed raw material is obtained, and the mass percent of reducing agent described in the mixed raw material is 1%~30%；The reduction roasting step includes: to put the mixed raw material rapidly after reduction furnace is warming up to reduction temperature and carry out reduction roasting into the reduction furnace, obtains reducing material, and the reduction temperature is 1100 DEG C~1250 DEG C, and the reduction roasting time is 10min~3h.The present invention is effectively synchronized by this method to slough leaded zinc difficulty and selects lead and zinc in iron material, significantly reduces impurities of lead, zinc content in the smart iron powder of gained, and then significantly improve smart iron powder grade；Preparation process is simple and direct simultaneously, extends the life of the blast furnace and smelts iron benefit promotion.)

1. a kind of recycle the method for preparing smart iron powder based on reduction roasting, which is characterized in that step includes that leaded zinc difficulty selects iron object Expect pretreatment, reduction roasting, anoxybiotic water quenching and mill ore magnetic selection, in which:

It includes: to mix after leaded zinc difficulty is selected iron material and the broken refinement of reducing agent that the leaded zinc difficulty, which selects iron material pre-treatment step, It closes uniformly, obtains mixed raw material, and the mass percent of reducing agent described in the mixed raw material is 1%~30%；

The reduction roasting step includes: that the mixed raw material is prevented rapidly described go back after reduction furnace is warming up to reduction temperature Reduction roasting is carried out in former furnace, obtains reducing material, and the reduction temperature is 1100 DEG C~1250 DEG C, and the reduction roasting time is 10min~3h.

2. according to claim 1 recycle the method for preparing smart iron powder based on reduction roasting, which is characterized in that described to go back Former agent includes one of solid reductant, liquid reducer and gaseous reducing agent and two or more mixtures.

3. according to claim 1 recycle the method for preparing smart iron powder based on reduction roasting, which is characterized in that described exhausted Oxygen water quenching step includes: to be discharged into the reducing material rapidly in the environment of starvation after the reduction roasting step In cooling water, the roasting mineral aggregate through water quenching is obtained.

4. according to claim 3 recycle the method for preparing smart iron powder based on reduction roasting, which is characterized in that the mill Mine magnetic separation step includes:

The roasting mineral aggregate through water quenching is successively cooled down, is dehydrated, is dried and Grinding procedure, until the roasting through water quenching Mineral aggregate obtains ore grinding mineral aggregate after dissociating substantially；

Will the ore grinding mineral aggregate carry out magnetic separation after obtain smart iron powder, magnetic field strength is 120kA/m~240kA/m when magnetic separation.

5. according to claim 4 recycle the method for preparing smart iron powder based on reduction roasting, which is characterized in that the base The specific degree of dissociation of the state of this dissociation is 80%~85%.

6. according to claim 4 recycle the method for preparing smart iron powder based on reduction roasting, which is characterized in that described in warp After Grinding procedure, particle of the granularity less than 45 μm accounts for 60%~90%.

7. the system that a kind of reduction roasting prepares smart iron powder, which is characterized in that including broken mixed cell, reduction roasting unit, Anoxybiotic water quenching unit, drying unit, ore grinding unit and magnetic separating unit, in which:

Leaded zinc difficulty select iron material in the broken mixed cell be crushed and after mixing, import the reduction roasting unit Middle carry out reduction roasting；

The reduction roasting unit is connected to the anoxybiotic water quenching unit, described in the reducing material after reduction roasting is discharged It is rapidly cooled in anoxybiotic water quenching unit, obtains the roasting mineral aggregate through water quenching；

The anoxybiotic water quenching unit is connected to after the drying unit with the ore grinding unit, for the roasted ore through water quenching Expect after cooling down in drying unit, be dehydrated and drying, imports ore grinding unit and simultaneously carry out Grinding procedure, obtain ore grinding mineral aggregate；

The ore grinding unit is connected to the magnetic separating unit, for importing in magnetic separating unit and sieving the ore grinding mineral aggregate Choosing, obtains smart iron powder.

8. the system that reduction roasting according to claim 7 prepares smart iron powder, which is characterized in that the reduction roasting system The system of standby smart iron powder requires any method for recycling the smart iron powder of preparation based on reduction roasting in 1~6 for perform claim.

9. the system that reduction roasting according to claim 7 prepares smart iron powder, which is characterized in that the reduction roasting list Member is one of box reduction furnace, tubular reduction furnace, atmosphere reduction furnace.

10. the system that reduction roasting according to claim 7 prepares smart iron powder, which is characterized in that the magnetic separating unit For weak magnetic sorting unit, the magnetic field strength of the weak magnetic sorting unit is 120kA/m~240kA/m.

Technical field

It is especially a kind of to recycle the method for preparing smart iron powder based on reduction roasting and be the present invention relates to mineral manufacture field System.

Background technique

Currently, China's iron ore deposit has iron ore grade low, iron mineral grain size number is thin, the iron ore deposit of complicated difficult choosing The higher feature of proportion.Under existing technical conditions, the most effective iron content weak magnetic oxidation material to hardly possible choosing is realized The method of efficient separation is to convert magnetic iron ore for low intensity magnetic separation iron oxide ore using magnetic roasting process, thoroughly changes iron in ore The occurrence status of mineral improves iron mineral and the physical chemical differences of gangue mineral between the two, to realize effectively sorting. The appearance of flash magnetization roasting technology and suspending magnetization roasting technology provides for China's iron content weak magnetic oxidation material technique of preparing New technological means.

But leaded zinc difficulty selects the embedding cloth relationship complexity of lead-zinc-iron, fine particles in iron material, passes through conventional magnetizing roast Beneficiation method is difficult to remove.The content that preservation selects the lead zinc in iron material that Iron concentrate is not only made to violate impurity element in leaded zinc difficulty Regulation, influences the grade of Iron concentrate, and be enriched with inside blast furnace sternly with the impurities of lead, zinc that iron ore concentrate enters blast furnace ironmaking operation Ghost image rings blast fumance safety, the life of the blast furnace and ironmaking benefit.Therefore a kind of method for urgently proposing smart iron powder of new preparation is used for It solves the above problems.

Summary of the invention

The object of the present invention is to provide a kind of method and system that the smart iron powder of preparation is recycled based on reduction roasting, are used for Solve the problems, such as that the leaded zinc of institute is difficult to remove in iron material in the prior art.

In order to solve the above technical problems, the present invention provides the first solutions: providing a kind of based on reduction roasting recycling The method for preparing smart iron powder, specific steps include that leaded zinc difficulty selects the pretreatment of iron material, reduction roasting, anoxybiotic water quenching and ore grinding magnetic Choosing, in which: it includes: to mix after leaded zinc difficulty is selected iron material and the broken refinement of reducing agent that leaded zinc difficulty, which selects iron material pre-treatment step, It closes uniformly, obtains mixed raw material, and the mass percent of reducing agent is 1%~30% in mixed raw material；Reduction roasting step packet It includes: after reduction furnace is warming up to reduction temperature, mixed raw material being prevented rapidly to carry out reduction roasting in reduction furnace, obtains reduzate Material, reduction temperature are 1100 DEG C~1250 DEG C, and the reduction roasting time is 10min~3h.

Preferably, reducing agent includes one of solid reductant, liquid reducer and gaseous reducing agent and two or more Mixture.

Wherein, anoxybiotic water quenching step include: after reduction roasting step, it is in the environment of starvation that reducing material is fast Speed is discharged into cooling water, obtains the roasting mineral aggregate through water quenching.

Wherein, mill ore magnetic selection step includes: the roasting mineral aggregate through water quenching successively to be cooled down, is dehydrated, is dried and ore grinding Process, until obtaining ore grinding mineral aggregate after the roasting mineral aggregate of water quenching dissociates substantially；Smart iron powder is obtained after ore grinding mineral aggregate is carried out magnetic separation, Magnetic field strength is 120kA/m~240kA/m when magnetic separation.

Preferably, the specific degree of dissociation of the state dissociated substantially is 80%~85%.

Preferably, after Grinding procedure, particle of the granularity less than 45 μm accounts for 60%~90%.

In order to solve the above technical problems, the present invention provides the second solutions: providing a kind of smart iron of reduction roasting preparation The system of powder, including broken mixed cell, reduction roasting unit, anoxybiotic water quenching unit, drying unit, ore grinding unit and magnetic separation list Member, in which: leaded zinc difficulty selects iron material to be crushed in broken mixed cell and after mixing, in importing reduction roasting unit into Row reduction roasting；Reduction roasting unit is connected to anoxybiotic water quenching unit, for anoxybiotic to be discharged in the reducing material after reduction roasting It is rapidly cooled in water quenching unit, obtains the roasting mineral aggregate through water quenching；Anoxybiotic water quenching unit after drying unit with ore grinding list Member connection after cooling down in drying unit, be dehydrated and dry for the roasting mineral aggregate through water quenching, imports ore grinding unit and is ground Mine order obtains ore grinding mineral aggregate；Ore grinding unit is connected to magnetic separating unit, for importing in magnetic separating unit and carrying out ore grinding mineral aggregate Screening, obtains smart iron powder.

Wherein, the system that reduction roasting prepares smart iron powder is used to execute any based on reduction roasting in aforementioned first solution Burn the method that recycling prepares smart iron powder.

Preferably, reduction roasting unit is one of box reduction furnace, tubular reduction furnace, atmosphere reduction furnace.

Preferably, magnetic separating unit is weak magnetic sorting unit, and the magnetic field strength of weak magnetic sorting unit is 120kA/m~240kA/ m。

The beneficial effects of the present invention are: being in contrast to the prior art, the present invention provides a kind of based on reduction roasting time The method and system for preparing smart iron powder are received, can effectively be synchronized by this method and be sloughed leaded zinc difficulty and select lead and zinc in iron material, Impurities of lead, zinc content in the smart iron powder of gained is significantly reduced, and then significantly improves the grade of smart iron powder；Preparation process letter simultaneously Victory reduces blast fumance safety problem, extends the life of the blast furnace and smelts iron benefit promotion.

Detailed description of the invention

Fig. 1 is to recycle the process flow chart for preparing one embodiment of method of smart iron powder in the present invention based on reduction roasting；

Fig. 2 is the schematic diagram for one embodiment of system that reduction roasting prepares smart iron powder in the present invention.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and 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 belongs to the scope of protection of the invention.

For the first solution in the present invention, referring to Fig. 1, Fig. 1 is in the present invention based on reduction roasting recycling system The process flow chart of one embodiment of method of standby essence iron powder.The method for preparing smart iron powder is recycled in the present invention based on reduction roasting Specific steps include:

S1: leaded zinc difficulty selects iron material to pre-process.In this step, select iron material and reducing agent broken leaded zinc difficulty or It is uniformly mixed after grinding, so that reaction is more abundant when subsequent progress reduction roasting, thus obtains mixed raw material, the mixed raw material The mass percent of middle reducing agent is 1%~30%.In present embodiment, reducing agent may include solid reductant, liquid also A kind of and two or more mixture in former agent, gaseous reducing agent, wherein solid reductant may include but be not limited to coal, coke The raw material containing fixed carbon such as charcoal, biomass, liquid reducer may include but be not limited to heavy oil, reclaimed oil (such as vegetable oil dregs, kitchen Remaining garbage regeneration oil etc.) etc. liquid charging stocks, gaseous reducing agent may include but be not limited to CO, CH₄、C₂H₂、CH₃CH₂CH₃Equal gases are former Material；According to reducing agent in contain solid-phase component, then mixed after needing to select leaded zinc difficulty iron material and reducing agent to be crushed together It closes uniform；According to reducing agent in do not contain solid-phase component, then only need to select iron material to be crushed leaded zinc difficulty, then again It is uniformly mixed with reducing agent；Selection and operation for reducing agent can be reasonably selected, herein not according to specific actual conditions It limits.

It should be pointed out that signified leaded zinc difficulty selects iron material to may include but be not limited to following substance in the present invention: containing The iron content weak magnetic oxide ore such as bloodstone, limonite, speculum iron, siderite of impurities of lead, zinc, iron-containing tailing or iron content dirt slag；Contain Iron non-ferrous metal ore tailing, iron content gold tailings, leaded zinc steel dirt slag, and its in metallurgy, chemical industry, Material Field The iron material of its leaded zinc.

S2: reduction roasting.It, will be fast by S1 step gained mixed raw material after reduction furnace is warming up to reduction temperature in this step Speed prevents from carrying out reduction roasting in reduction furnace, obtains reducing material, and reduction temperature is 1100 DEG C~1250 DEG C, the reduction roasting time For 10min~3h.

Specifically, the reaction mechanism in the step is described in detail.Reaction equation included in S2 step has: 3Fe₂O₃(s)+CO (g)=2Fe₃O₄(s)+CO₂(g) (1)

Fe₃O₄(s)+CO (g)=3FeO (s)+CO₂(g) (2)

FeO (s)+CO (g)=Fe (s)+CO₂(g) (3)

PbS (s)+2PbO (s)=3Pb (l)+SO₂(g) (4)

PbS(s)+PbSO₄(s)=2Pb (l)+2SO₂(g) (5)

PbCO₃[2PbCO₃·Pb(OH)₂](s)→PbO(s) (6)

ZnCO₃[2ZnCO₃·3Zn(OH)₂](s)→ZnO(s) (7)

PbO (s)+CO (g)=Pb (g)+CO₂(g) (8)

ZnO (s)+CO (g)=Zn (g)+CO₂(g) (9)

Wherein Fe₂O₃Reaction principle regards its maturing temperature, presses Fe from low to high₂O₃→Fe₃O₄→ FeO → Fe sequence occur into Row reduction, corresponding chemical reaction such as above-mentioned chemical formula (1)~(3)；Between 750 DEG C~850 DEG C, Fe₂O₃Reduction generates Fe₃O₄ And CO₂；Between 900 DEG C~950 DEG C, Fe₃O₄It crosses reduction and generates FeO and CO₂；When maturing temperature is more than 1000 DEG C, FeO continues It is reduced and generates simple substance Fe and CO₂.Meanwhile leaded zinc difficulty selects the impurities of lead, zinc in iron material to occur in roasting process by synchronous Reduction reaction, and impurities of lead, zinc is removed because pyroprocess is volatilized after reaction, that is, the anti-of such as above-mentioned chemical formula (4)~(9) occurs It answers, achievees the purpose that remove such as lead zinc objectionable impurities.

Further, mixing to be restored is taken full advantage of to 1100 DEG C~1250 DEG C in the suitable reduction temperature of control Iron-bearing mineral, impure mineral and gangue mineral are (as contained SiO in raw material₂、Al₂O₃Silicate mineral) different hot properties, into The micro- melt selective reduction of row high temperature, it is advantageous that: (1) iron-bearing mineral is in micro- smelting reduction, is made in higher surface tension The secondary enrichment with lower aggregation, forms tiny iron granule；(2) and around iron mineral and internal mine containing impurities of lead, zinc Object, Accelerating reduction due to micro- smelting reduction of periphery iron mineral, and be conducive to take off in gaseous lead, the synchronous evolution of zinc impurity It removes；(3) higher melt ingredient, such as SiO in roasting raw material to be restored₂、Al₂O₃, silicate mineral etc., still keep solid state shape, keep away Exempt from tiny micro- melt granulated metal iron further to reunite and mix, is conducive to the progress of subsequent ore grinding Yu magnetic separation process.I.e. The advantages of high temperature micro- melt selective reduction technology is the reunion for being conducive to fine metal iron, keeps impurities of lead, zinc effective Removing, and prevent mixing for iron mineral and gangue mineral, the more conducively screening of metallic iron.

In present embodiment, control reduction temperature is 1100 DEG C~1250 DEG C, and the recovery time is 10min~3h, and is being had In body experimentation, leaded zinc difficulty selects the impurities of lead, zinc content in iron material that can impact to the setting of specific reduction temperature, Leaded zinc difficulty selects the granule size of iron material and composition that can impact to the specific recovery time simultaneously, therefore needs according to specific real Border situation sets the occurrence of reduction temperature and recovery time, is not limited thereto.

S3: anoxybiotic water quenching.It is in the environment of starvation that reducing material is fast after reduction roasting step in this step Speed is discharged into cooling water, obtains the roasting mineral aggregate through water quenching.Specifically, the effect that anoxybiotic water quenching is quickly cooled down is: preventing Iron mineral re-oxidation through restoring leads to magnetic weaken of roasted product and is unfavorable for subsequent magnetic separation process；Meanwhile favorably It is further diverged from time with metallic iron in soluble impurities of lead, zinc in mineral aggregate will be roasted, prevents from reoxidizing or adsorbing in cooling procedure On iron mineral surface, the removal efficiency of impurities of lead, zinc is improved.As can be seen that by acquisition is more advantageous to compared with Gao Pin after roasting mineral aggregate water quenching The iron powder material product of position.

S4: mill ore magnetic selection.In this step, the roasting mineral aggregate through water quenching is successively cooled down, is dehydrated, is dried and ore grinding work Sequence, until obtaining ore grinding mineral aggregate after the roasting mineral aggregate of water quenching dissociates substantially, in present embodiment, granularity is less than after Grinding procedure 45 μm of particle accounts for 60%~90%, and dissociate substantially refer to by the specific degree of dissociation of valuable mineral in rock-mineral determination be 80%~ 85%；Will ore grinding mineral aggregate carry out magnetic separation after obtain smart iron powder, magnetic field strength is 120kA/m~240kA/m when magnetic separation.

For the second solution in the present invention, referring to Fig. 2, Fig. 2 is that reduction roasting prepares smart iron powder in the present invention One embodiment of system schematic diagram.The system that reduction roasting prepares smart iron powder in the present invention, including broken mixed cell 201, reduction roasting unit 202, anoxybiotic water quenching unit 203, drying unit 204, ore grinding unit 205 and magnetic separating unit 206；Its In, leaded zinc difficulty select iron material in broken mixed cell 201 be crushed and after mixing, importing reduction roasting unit 202 in Carry out reduction roasting；Reduction roasting unit 202 is connected to anoxybiotic water quenching unit 203, for by the reducing material after reduction roasting It is rapidly cooled in discharge anoxybiotic water quenching unit 203, obtains the roasting mineral aggregate through water quenching；Anoxybiotic water quenching unit 203 is through drying It is connected to after unit 204 with ore grinding unit 205, cools down in drying unit 204, is dehydrated and dries for the roasting mineral aggregate through water quenching Afterwards, it imports ore grinding unit 205 and carries out Grinding procedure, obtain ore grinding mineral aggregate；Ore grinding unit 205 is connected to magnetic separating unit 206, is used In importing in magnetic separating unit and screening ore grinding mineral aggregate, smart iron powder is obtained.In present embodiment, it is crushed mixed cell and uses Alloy pulverizer and agitating device；Reduction roasting unit is one of box reduction furnace, tubular reduction furnace, atmosphere reduction furnace； Magnetic separating unit is weak magnetic sorting unit, and the magnetic field strength of weak magnetic sorting unit is set as 120kA/m~240kA/m.

Reduction roasting prepares the system of smart iron powder for executing aforementioned first solution in second solution of the invention In the method for preparing smart iron powder recycled based on reduction roasting, i.e. the preparation-obtained smart iron powder of two solutions, structure and Function should be consistent.

Below with reference to chart and specific embodiment to recycled in the present invention based on reduction roasting the method for preparing smart iron powder and The implementation result of system is further elaborated.