CN106755969A - A kind of method of reinforced by additive bloodstone magnetizing roast - Google Patents
A kind of method of reinforced by additive bloodstone magnetizing roast Download PDFInfo
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- CN106755969A CN106755969A CN201611043735.8A CN201611043735A CN106755969A CN 106755969 A CN106755969 A CN 106755969A CN 201611043735 A CN201611043735 A CN 201611043735A CN 106755969 A CN106755969 A CN 106755969A
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- bloodstone
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- magnetizing roast
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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
- C22B1/02—Roasting processes
- C22B1/10—Roasting processes in fluidised form
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Abstract
A kind of method of reinforced by additive bloodstone magnetizing roast, is carried out according to the following steps：（1）Using magnetite concentrate as additive, it is added in ground hematite and fully mixes；（2）With gaseous reducing agent or solid reductant as medium, mixed mineral powder is calcined；（3）Then water quenching cooling carries out ore grinding and magnetic separation is separated to normal temperature, obtains magnetite powder.Additive of the invention is easily obtained, can directly using the magnetite concentrate of mineral processing plant, and iron recovery is high, and any equipment and flow of existing magnetizing roast are not changed, the characteristics of with investing low, simple to operate, economic and practical.
Description
Technical field
The invention belongs to mineral processing, metallurgical technology field, more particularly to a kind of reinforced by additive bloodstone magnetizing roast
Method.
Background technology
There is the bloodstone resource that wide variety of conventional beneficiation method is difficult by China, and realizes that its utilization can increase China available
Iron ore resource reserves, alleviate the nervous situation of ferrolite supply, improve the degree of protection of ferrolite supply safety.Magnetizing roast
Pretreatment-magnetic separation is that refractory hematite resources development and utilization is typical, effective method, will hematite in certain atmosphere bar
Heating is chemically reacted under part, optionally makes weak magnetic bloodstone therein（Fe2O3）It is changed into ferromagnetic magnetic iron ore
（Fe3O4）, and gangue mineral magnetic is almost unchanged.
The magnetic contrast for artificially increasing useful iron mineral and gangue mineral is pre-processed by magnetizing roast, is improve red
The washability of iron ore.Therefore, ore dressing scientific worker just has started to research and develop iron ore magnetizing roast technology early in 20 beginnings of the century,
According to the difference of type of reactor, magnetizing roast can be divided into shaft furnace magnetizing roast, rotary kiln magnetizing roast, fluidization magnetizing roast
With microwave magnetizing roast.But the above method concentrate on process optimization and equipment improvement aspect, cannot thoroughly solve bloodstone to
Magnetic iron ore conversion reaction speed is slow, efficiency is low and reacts the common problem such as insufficient.Therefore, bloodstone magnetizing roast is strengthened
The correlation technique and method of journey are also to be developed.
The content of the invention
Bloodstone converts effect to magnetic iron ore during the purpose of the present invention is directed to existing bloodstone magnetizing roast preprocessing process
A kind of low technical problem of rate, there is provided method of reinforced by additive bloodstone magnetizing roast, improves bloodstone and is reduced to magnetic iron ore
Conversion ratio, while shortening roasting time, reach the purpose of efficiently quick production.
The method of the present invention is carried out according to the following steps：
（1）Using the magnetite concentrate of fineness≤100 mesh as additive, it is added in the ground hematite of fineness≤50 mesh and abundant
Mix, additive is loaded to bloodstone particle surface using the agglomerate performance between mineral powder granular and serve as crystal seed, form composite ore
Powder；Wherein magnetite concentrate is with the mass ratio of ground hematite（0.1~1）:10；
（2）With gaseous reducing agent as medium, mixed mineral powder is placed in fluidized reduction stay groove, carries out suspended state Roasting
Burn, sintering temperature is 500 ~ 600 DEG C, roasting time is 0.5 ~ 5min, obtains roasted ore；Or with solid reductant as medium,
Mixed mineral powder is placed in carries out magnetizing roast in rotary kiln, sintering temperature is 750 ~ 900 DEG C, and roasting time is 5 ~ 30min, is obtained
Roasted ore；
（3）By roasted ore water quenching cooling to normal temperature, then carry out ore grinding and magnetic separation is separated, obtain magnetite powder and non magnetic gangue
Mine tailing.
The Iron grade of above-mentioned magnetite concentrate is 43 ~ 72%.
Iron grade >=30% of above-mentioned bloodstone.
Above-mentioned gaseous reducing agent is CO, H2Or water-gas, during suspended state magnetizing roast, the apparent velocity of gaseous reducing agent
It is 0.1 ~ 0.3m/s.
Iron grade >=66% of above-mentioned magnetite powder.
In the above method, solid reductant be bituminous coal, lignite, peat, biomass carbon and upgraded coal in one or two
Mixture above, the consumption of solid reductant is the 5 ~ 15% of mixed mineral powder gross weight.
Above-mentioned ore grinding and magnetic separation separate and refer to：Roasted ore after water quenching is levigate to fineness≤325 mesh, Ran Hou
Magnetic separation is carried out under the magnetic field intensity of 80kA/m.
Above-mentioned step（2）In, bloodstone is 85 ~ 97% to the conversion ratio of magnetic iron ore.
Above-mentioned step（3）In, the rate of recovery of iron is 80 ~ 95%.
Principle of the invention is summarized as follows：
Magnetic iron ore component is in magnetization in additive（Reduction）Bloodstone particle surface is supported in roasting process and serves as crystal seed（Also known as
Nucleating agent）, the reaction coring potential barrier that bloodstone is converted to magnetic iron ore is on the one hand substantially reduced, it is the forming core and length of newborn magnetic iron ore
It is big that reaction interface is provided, improve crystalline rate；On the other hand, bloodstone can be promoted quickly to be reduced to magnetic iron ore crystal grain, shortens anti-
Between seasonable.It is generally represented as improve reaction conversion ratio of the bloodstone to magnetic iron ore reduction transformation, improves roasted product
Quality, is that follow-up efficient magnetic separation recovery iron creates material conditions.
Compared with the magnetizing roast preprocess method of existing treatment refractory hematite, the present invention has following outstanding advantages：
（1）Additive is easily obtained, can directly using the magnetite concentrate of mineral processing plant, with remarkably promoting bloodstone to magnet
The effect of ore deposit conversion；
（2）The magnetizing roast time can significantly be shortened, iron recovery is high；Under optimum condition, the content of Fe is big in the product of acquisition
In 66%, iron recovery is higher than 90%, can be used as high-quality iron-smelting furnace charge.
（3）The present invention does not change any equipment and flow of existing magnetizing roast, with investing low, simple to operate, warp
The characteristics of Ji is applicable.
Brief description of the drawings
Fig. 1 is a kind of process flow diagram of the method for reinforced by additive bloodstone magnetizing roast of the invention.
Specific embodiment
Following embodiment is only limitted to explain the present invention that the method for the present invention is not limited to embodiment.
Bituminous coal, lignite, peat, biomass carbon and upgraded coal in the embodiment of the present invention are commercial products.
This method can conversion process from efficient hardening bloodstone to magnetic iron ore, make reaction conversion ratio and iron recovery relative to
Do not use additive to be respectively increased 10 ~ 20% and 5 ~ 20%, and the species characteristics adjustment additive of different ground hematites can be directed to
Consumption, to reach optimal reinforcing effect.
Embodiment 1
Using the magnetite concentrate of fineness≤100 mesh as additive, it is added in the ground hematite of fineness≤50 mesh and fully mixes
It is even, additive is loaded to bloodstone particle surface using the agglomerate performance between mineral powder granular and serve as crystal seed, form mixed mineral powder；
Wherein magnetite concentrate and the mass ratio of ground hematite is 0.1:10；The Iron grade of magnetite concentrate is 70.5%, the iron of bloodstone
Grade 31%；
With gaseous reducing agent as medium, mixed mineral powder is placed in fluidized reduction stay groove, carries out suspended state magnetizing roast, roasted
It is 500 DEG C to burn temperature, and roasting time is 5min, obtains roasted ore；Described gaseous reducing agent is CO, suspended state magnetizing roast
When, the apparent velocity of gaseous reducing agent is 0.1m/s；
It is by roasted ore water quenching cooling to normal temperature then levigate to fineness≤325 mesh, magnetic is then carried out under the magnetic field intensity of 80kA/m
Choosing, obtains magnetite powder and non magnetic gangue mine tailing；The wherein Iron grade 66.4% of magnetite powder, bloodstone turns to magnetic iron ore
Rate is 85%（Magnetic iron ore amount calculates gained in deducting additive）, the rate of recovery of iron is 82%（Deduct magnetic iron ore amount in additive
Calculate gained）；
In the case where additive is not used, contrast test is carried out as stated above, bloodstone is to the conversion ratio of magnetic iron ore
76.6%, the rate of recovery of iron is 74.3%.
Embodiment 2
Method is with embodiment 1, difference：
（1）Magnetite concentrate is 0.5 with the mass ratio of ground hematite:10；The Iron grade of magnetite concentrate is 54%, bloodstone
Iron grade 34%；
（2）With gaseous reducing agent as medium, mixed mineral powder is placed in fluidized reduction stay groove, carries out suspended state Roasting
Burn, sintering temperature is 600 DEG C, and roasting time is 0.5min, obtain roasted ore；Described gaseous reducing agent is H2, suspended state magnetic
When changing roasting, the apparent velocity of gaseous reducing agent is 0.3m/s；
（3）The Iron grade 66.7% of magnetite powder, bloodstone is 92% to the conversion ratio of magnetic iron ore（Deduct magnetic iron ore amount in additive
Calculate gained）, the rate of recovery of iron is 89%（Magnetic iron ore amount calculates gained in deducting additive）.
In the case where additive is not used, carry out contrast test as stated above, conversion ratio from bloodstone to magnetic iron ore
It is 75.3%, the rate of recovery of iron is 72.4%.
Embodiment 3
Method is with embodiment 1, difference：
（1）Magnetite concentrate is 1 with the mass ratio of ground hematite:10；The Iron grade of magnetite concentrate is 43%, the iron of bloodstone
Grade 33%；
（2）With gaseous reducing agent as medium, mixed mineral powder is placed in fluidized reduction stay groove, carries out suspended state Roasting
Burn, sintering temperature is 550 DEG C, and roasting time is 2min, obtain roasted ore；Described gaseous reducing agent is water-gas, suspended state
During magnetizing roast, the apparent velocity of gaseous reducing agent is 0.2m/s；
（3）The Iron grade 67.2% of magnetite powder, bloodstone is 97% to the conversion ratio of magnetic iron ore（Deduct magnetic iron ore amount in additive
Calculate gained）, the rate of recovery of iron is 95%（Magnetic iron ore amount calculates gained in deducting additive）.
In the case where additive is not used, carry out contrast test as stated above, conversion ratio from bloodstone to magnetic iron ore
It is 76.3%, the rate of recovery of iron is 71.8%.
Embodiment 4
Method is with embodiment 1, difference：
（1）Magnetite concentrate is 0.2 with the mass ratio of ground hematite:10；The Iron grade of magnetite concentrate is 70%, bloodstone
Iron grade 35%；
（2）With solid reductant as medium, mixed mineral powder is placed in carries out magnetizing roast in rotary kiln, and sintering temperature is 750 DEG C,
Roasting time is 30min, obtains roasted ore；Described solid reductant is bituminous coal, and the consumption of solid reductant is mixed mineral powder
The 5% of gross weight；
（3）The Iron grade 66.5% of magnetite powder, bloodstone is 88% to the conversion ratio of magnetic iron ore（Deduct magnetic iron ore amount in additive
Calculate gained）, the rate of recovery of iron is 84%（Magnetic iron ore amount calculates gained in deducting additive）；
In the case where additive is not used, contrast test is carried out as stated above, bloodstone is to the conversion ratio of magnetic iron ore
80.8%, the rate of recovery of iron is 78.5%.
Embodiment 5
Method is with embodiment 1, difference：
（1）Magnetite concentrate is 0.6 with the mass ratio of ground hematite:10；The Iron grade of magnetite concentrate is 49%, bloodstone
Iron grade 32%；
（2）With solid reductant as medium, mixed mineral powder is placed in carries out magnetizing roast in rotary kiln, and sintering temperature is 800 DEG C,
Roasting time is 15min, obtains roasted ore；Described solid reductant be bituminous coal and lignite etc. mass mixing thing, solid is also
The consumption of former agent is the 10% of mixed mineral powder gross weight；
（3）The Iron grade 66.9% of magnetite powder, bloodstone is 90% to the conversion ratio of magnetic iron ore（Deduct magnetic iron ore amount in additive
Calculate gained）, the rate of recovery of iron is 89%（Magnetic iron ore amount calculates gained in deducting additive）；
In the case where additive is not used, contrast test is carried out as stated above, bloodstone is to the conversion ratio of magnetic iron ore
78.5%, the rate of recovery of iron is 75.4%.
Embodiment 6
Method is with embodiment 1, difference：
（1）Magnetite concentrate is 0.8 with the mass ratio of ground hematite:10；The Iron grade of magnetite concentrate is 46%, bloodstone
Iron grade 36%；
（2）With solid reductant as medium, mixed mineral powder is placed in carries out magnetizing roast in rotary kiln, and sintering temperature is 900 DEG C,
Roasting time is 5min, obtains roasted ore；Described solid reductant for peat, biomass carbon and upgraded coal etc. mass mixing
Thing, the consumption of solid reductant is the 15% of mixed mineral powder gross weight；
（3）The Iron grade 67.1% of magnetite powder, bloodstone is 96% to the conversion ratio of magnetic iron ore（Deduct magnetic iron ore amount in additive
Calculate gained）, the rate of recovery of iron is 94%（Magnetic iron ore amount calculates gained in deducting additive）；
In the case where additive is not used, contrast test is carried out as stated above, bloodstone is to the conversion ratio of magnetic iron ore
82.5%, the rate of recovery of iron is 77.3%.
Claims (8)
1. a kind of method of reinforced by additive bloodstone magnetizing roast, it is characterised in that carry out according to the following steps：
（1）Using the magnetite concentrate of fineness≤100 mesh as additive, it is added in the ground hematite of fineness≤50 mesh and abundant
Mix, additive is loaded to bloodstone particle surface using the agglomerate performance between mineral powder granular and serve as crystal seed, form composite ore
Powder；Wherein magnetite concentrate is with the mass ratio of ground hematite（0.1~1）:10；
（2）With gaseous reducing agent as medium, mixed mineral powder is placed in fluidized reduction stay groove, carries out suspended state Roasting
Burn, sintering temperature is 500 ~ 600 DEG C, roasting time is 0.5 ~ 5min, obtains roasted ore；Or with solid reductant as medium,
Mixed mineral powder is placed in carries out magnetizing roast in rotary kiln, sintering temperature is 750 ~ 900 DEG C, and roasting time is 5 ~ 30min, is obtained
Roasted ore；
（3）By roasted ore water quenching cooling to normal temperature, then carry out ore grinding and magnetic separation is separated, obtain magnetite powder and non magnetic gangue
Mine tailing.
2. the method for a kind of reinforced by additive bloodstone magnetizing roast according to claim 1, it is characterised in that described
The Iron grade of magnetite concentrate is 43 ~ 72%, Iron grade >=30% of described bloodstone.
3. the method for a kind of reinforced by additive bloodstone magnetizing roast according to claim 1, it is characterised in that described
Gaseous reducing agent is CO, H2Or water-gas, during suspended state magnetizing roast, the apparent velocity of gaseous reducing agent is 0.1 ~ 0.3m/s.
4. the method for a kind of reinforced by additive bloodstone magnetizing roast according to claim 1, it is characterised in that described
Solid reductant is one or more the mixture in bituminous coal, lignite, peat, biomass carbon and upgraded coal, and solid is also
The consumption of former agent is the 5 ~ 15% of mixed mineral powder gross weight.
5. the method for a kind of reinforced by additive bloodstone magnetizing roast according to claim 1, it is characterised in that described
Iron grade >=66% of magnetite powder.
6. the method for a kind of reinforced by additive bloodstone magnetizing roast according to claim 1, it is characterised in that described
Ore grinding and magnetic separation separate and refer to：Roasted ore after water quenching is levigate to fineness≤325 mesh, then under the magnetic field intensity of 80kA/m
Carry out magnetic separation.
7. a kind of method of reinforced by additive bloodstone magnetizing roast according to claim 1, it is characterised in that step（2）
In, bloodstone is 85 ~ 97% to the conversion ratio of magnetic iron ore.
8. a kind of method of reinforced by additive bloodstone magnetizing roast according to claim 1, it is characterised in that step（3）
In, the rate of recovery of iron is 80 ~ 95%.
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Cited By (5)
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| CN107335536A (en) * | 2017-07-11 | 2017-11-10 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of hermetically sealed dry type of suspension roasting Iron Ore Powder throws useless technique |
| CN108486362A (en) * | 2018-05-28 | 2018-09-04 | 东北大学 | It is a kind of that carbonaceous pelletizing mine, its pellet and its smelting process are prepared using bloodstone |
| CN108588404A (en) * | 2018-05-24 | 2018-09-28 | 东北大学 | A kind of fluosolids roasting technique of processing iron ore |
| CN108677003A (en) * | 2018-05-24 | 2018-10-19 | 东北大学 | A kind of fluidisation state calciner |
| CN110564951A (en) * | 2018-06-05 | 2019-12-13 | 中国科学院过程工程研究所 | Iron ore fluidization magnetizing roasting method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN108588404A (en) * | 2018-05-24 | 2018-09-28 | 东北大学 | A kind of fluosolids roasting technique of processing iron ore |
| CN108677003A (en) * | 2018-05-24 | 2018-10-19 | 东北大学 | A kind of fluidisation state calciner |
| CN108677003B (en) * | 2018-05-24 | 2019-10-01 | 东北大学 | A kind of fluidisation state calciner |
| CN108588404B (en) * | 2018-05-24 | 2019-10-01 | 东北大学 | A kind of fluosolids roasting technique handling iron ore |
| CN108486362A (en) * | 2018-05-28 | 2018-09-04 | 东北大学 | It is a kind of that carbonaceous pelletizing mine, its pellet and its smelting process are prepared using bloodstone |
| CN110564951A (en) * | 2018-06-05 | 2019-12-13 | 中国科学院过程工程研究所 | Iron ore fluidization magnetizing roasting method |
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| CN106755969B (en) | 2018-06-26 |
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