CN105903560B - Deep iron extraction and impurity reduction process for refractory siderite resource - Google Patents
Deep iron extraction and impurity reduction process for refractory siderite resource Download PDFInfo
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- CN105903560B CN105903560B CN201610226396.0A CN201610226396A CN105903560B CN 105903560 B CN105903560 B CN 105903560B CN 201610226396 A CN201610226396 A CN 201610226396A CN 105903560 B CN105903560 B CN 105903560B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
Abstract
The invention discloses a process for deeply extracting iron and reducing impurities from refractory siderite resources, which comprises the steps of adding a composite auxiliary agent for direct roasting, and carrying out water quenching, fine grinding, low-intensity magnetic separation and dehydration and drying on a magnetic product to realize deep iron extraction and impurity reduction (phosphorus, sulfur, silicon and aluminum); for siderite with high phosphorus, high sulfur, high silicon and high aluminum, the invention can realize better iron extraction and impurity reduction effects, and can obtain the technical indexes of process beneficiation, wherein the iron grade is more than 75%, the phosphorus content is less than 0.1%, the sulfur content is less than 0.1%, the silicon dioxide content is less than 5%, the aluminum oxide content is less than 1.5%, and the iron recovery rate is more than 75%, and the technical indexes are superior to the technical indexes of the prior art for treating the iron ore of the type.
Description
Technical field
The invention belongs to hardly possiblies, and the iron that carries of smelting siderite to be selected to drop miscellaneous field, especially adapt to, ore composition thin with disseminated grain size
A kind of difficulty of the features such as complexity, high phosphorus, high-sulfur, high silicon, high alumina selects smelting siderite resource depth to put forward iron drop general labourer's skill.
Background technology
Ferrous metal ore Experimental study on ore dressing is highly important to accelerating the development of China's steel and iron industry to serve.Have
Exploration result explanation, the ferrous metal ore resource in China is extremely abundant.But iron ore-deposit wide variety, property is complicated, and often
For Multiple components symbiosis.Since iron ore contains useful component or the objectionable impurities that should remove for comprehensive utilization mostly, because
This most ore all needs ore dressing to handle.We always follow the utilization of iron ore deposit poor, easy first and difficult later after getting rich first
Principle.With the high speed development of modern industry, the limited rich ore in China and the resource easily selected have been petered out.It is available at present
Iron ore deposit increasingly tend to it is poor, thin, miscellaneous.Sulphur, phosphorus, silica, alundum (Al2O3) etc. are harmful miscellaneous in China's iron ore deposit
Matter content it is high and with valuable mineral fine-grained disseminated grain, cause that ore dressing difficulty is big, efficiency is low, poor product quality.Sulphur, phosphorus, silicon, aluminium etc. are
Main harmful element in steel smelting procedure, seriously affects process for making and steel product quality.With the hair of metallurgical industry
The implementation of exhibition and new process, it is higher and higher to the quality requirement of iron ore concentrate, also there is stringent limit to the content of sulphur, phosphorus, silicon, aluminium
It is fixed.Iron ore concentrate efficiently drops miscellaneous extremely urgent.It effectively recycles and has become ore dressing worker using this part ore and mainly study
One of project.
Main relevant technology has at present：
（1）Publication date is on July 11st, 2007, and the Chinese invention patent document of Publication No. CN1995411 discloses
" utilizing the technique of low-grade siderite production fine iron breeze ", it includes the following steps：Broken-screening：With low-grade siderite
Make raw material, the roasting lump ore of 10~40mm of granularity is obtained after broken-screening；Rotary kiln baking：Make fuel with coal gas, carries out magnetic
Change roasting, makes the FeCO in siderite3It is converted into Fe3O4；It is cooling：Temperature still has 400~500 DEG C when furnace charge is come out of the stove, using isolation
Air slow cooling is to 300 DEG C hereinafter, water quenching chilling again；Ball milling-screening：Roasted ore carries out making the de- magnetic-magnetic of magnetic separation-after ball milling
Choosing, magnetic field intensity 1000 and 800 oersteds, obtain fine iron breeze.The present invention has the following advantages：Siderite is fully utilized and carries out work
Industry produces, and improves magnetizing roast product grade and the ore dressing quality of product of roasting, reduces production cost, reaches industrial
Scale development produces, and the iron ore concentrate of grade 55.18% can be obtained, metal recovery rate reaches 74.60%.
（2）Publication date is August in 2015 19, and the Chinese invention patent document of Publication No. CN104846189A is open
" the mixing iron ore fluosolids roasting method for separating containing siderite ", this method is by the mixing containing siderite of granularity -0.5mm
Iron ore carries out multi-stage fluidized state preheating in oxidizing atmosphere, and it is 600~800 DEG C to be preheating to mixing iron ore temperature；Then it is fluidizing
Under the conditions of state, preheating resulting material is roasted in reducing atmosphere, is further arranged in progress fluidization in air and is cooled to room temperature,
Mill ore magnetic selection both obtains again.The method of the present invention is suitable for the sorting of a variety of composite ores containing siderite, and reaction speed is fast, efficiency
Height, the by-product for being unfavorable for sorting in technical process is few, and low energy consumption, and good separation effect is very suitable for industrialization promotion.
（3）Publication date is on June 27th, 2012, and the Chinese invention patent document of Publication No. CN102513203A is open
" a kind of method of high phosphorus-sulfur siderite resource recycling ", this method includes fine grinding raw ore, asynchronous reverse flotation dephosphorization sulphur obtains
Rough concentrate in roaster is added sodium carbonate reduction roasting, obtains reduction roasting mine, passes through levigate reduction by the rough concentrate of low-phosphorous sulphur
Roasted ore carries out magnetic flocculation-enhanced sorting, can not only improve concentrate Iron grade by the technique, simultaneously effective enhance particulate
The recycling of grade and microfine magnetic mineral and the deep removal for realizing roasted ore phosphorus sulphur significantly improve a large amount of dull difficulties at present
The recovery utilization rate of the high phosphorus-sulfur siderite resource of choosing can finally obtain Iron grade and be more than 65%, and iron recovery is more than 65%, and phosphorus contains
Amount is less than 0.2%, and sulfur content is less than 0.3% iron ore concentrate.
The drop of high-sulfur high-silicon high aluminium profiles siderite is miscellaneous in recent years has achieved some achievements, but also fails to fundamentally solve
Problem.Siderite depth drop silicon, sulphur, aluminium have become a great problem of domestic and international beneficiation research.For a long time due to not managing
The miscellaneous method of drop thought, causes the level of comprehensive utilization of this part iron ore deposit relatively low, causes the mine having high because of siliceous, sulphur, aluminium
And stop adopting, some mines have seriously affected quality and the market of iron ore concentrate because harmful element sulphur, silicon, aluminium do not lower.Cause
It is imperative that this effectively develops more economical and practical new technology.
Shortcoming existing for processing of the existing known technology to siderite is mainly two aspects：In one side iron ore concentrate
Harmful element sulphur can realize effective reduction, but the effective reduction relatively difficult to achieve of silicon, aluminium content, to subsequent smelting technique will generate
Adverse effect；On the other hand siderite is mainly handled using roasting technique, but the Iron grade of iron ore concentrate is still relatively low, and the rate of recovery
Also relatively low, processing cost is still higher.
Invention content
Rationally effectively to select smelting siderite ore resource compared with the difficulty of horn of plenty using China, alleviate current iron ore resource
Nervous situation realizes that depth carries iron drop phosphorus, sulphur, silicon, aluminium using the present invention, obtains the high-purity refined iron-mineral that Iron grade is more than 75%,
The comprehensive utilization of smelting high phosphorus high-sulfur high-silicon high aluminium profiles siderite resource is selected to provide a new approaches for China's difficulty, while to other
The processing of similar Complex Iron Ore stone provides certain directive significance.
A kind of difficulty selects smelting siderite resource depth to put forward iron drop general labourer's skill, it is characterised in that：First by 0.5%~3% chlorine
Change cuprous, 3%~15% lime, 20%~50% magnesium chloride, 1%~3% calcium chloride, 10%~40% reducing agent and sparring is added
Green ore is roasted in roaster after mixing, and the product after roasting obtains water quenching product by water quenching, and water quenching product is through ball milling
It is sorted with low-intensity (magnetic) separator after machine ore grinding, can finally obtain Iron grade ＞ 75%, phosphorous ＜ 0.1%, sulphur ＜ 0.1%, two
Silica ＜ 5%, alundum (Al2O3) ＜ 1.5%, the iron ore concentrate of iron recovery ＞ 85%, the fine iron breeze can be straight after pelletizing
Connect the raw material as manUfaCtUre of pig iron.
It is to realize that depth carries using composite assistant roasting direct-fine grinding-low intensity magnetic separation to select smelting siderite, the present invention for difficulty
Iron drop is miscellaneous（Phosphorus, sulphur, silicon, aluminium）Technological process, specifically include following steps：
（1）The muck stage：As needed by ore reduction to 3mm or less；
（2）The drying and dewatering stage：It will be crushed in 3mm ore merging roasters below, control temperature is 400~600
Drying and dewatering is carried out at DEG C, drying time is controlled in 30~60min；
（3）The powder ball ball stage processed：Material after drying and dewatering is dry grinded to -0.074mm hereinafter, 0.5%~3% chlorine is added
Change cuprous, 3%~15% lime, 20%~50% magnesium chloride, 1%~3% calcium chloride, 10%~40% coke and material mixing
Afterwards, the pelletizing material as a diameter of 8 mm of pelletizing is prepared with pelletizer；
（4）The pelletizing drying materials stage：The pelletizing material of 8mm is dried in roaster, drying temperature be 200~
300 DEG C, pelletizing is dried to and aqueous is less than 8%；
（4）Firing stage：By it is aqueous be less than 8% pelletizing material merging roasting kiln roasting, calcination temperature 1100~1200
DEG C, 60~90min of roasting time；
（5）The water quenching cooling stage：Water quenching cooling will be carried out in material merging water after roasting, control material enters water in water
The time interval quenched is less than 3min；
（6）The grind grading stage：Material after water quenching is entered into ball mill and carries out ore grinding, ball mill overflow enters waterpower rotation
Device is flowed, the fineness of hydrocyclone overflow is controlled accounts for 90% or more in -0.019mm；
（7）The low intensity magnetic separation stage：Classifier overflow is transported to low-intensity (magnetic) separator, the magnetic field intensity of magnetic separator 350~
550Oe, magnetic product is obtained by low intensity magnetic separation；
（8）Magnetic product dehydrates the stage, and magnetic product is dry that iron ore concentrate, obtained iron are smart after filtering means dehydration
Mineral products iron content ＞ 75%, phosphorous ＜ 0.1%, sulphur ＜ 0.1%, silica ＜ 5%, alundum (Al2O3) ＜ 2%, iron recovery ＞
85%。
The reducing agent is coke.
Beneficial effects of the present invention are as follows：For high phosphorus high-sulfur high-silicon high aluminium siderite, using the present invention may be implemented compared with
Miscellaneous effect drops in the good iron that carries, and Iron grade can be obtained and be more than 75%, phosphorus content contains less than 0.1%, sulfur content less than 0.1%, silica
Amount is less than 1.5% less than 5%, alundum (Al2O3) content, and iron recovery is more than 75% flow beneficiating technology index, is better than existing public affairs
Know the technical indicator of technical finesse the type iron ore；The development and utilization of smelting iron ore resource is selected to open for China's complicated difficult
One new approaches.
Description of the drawings
Fig. 1 is the process flow diagram of the present invention.
Specific implementation mode
Embodiment 1
Sample ore comes from Chongqing somewhere iron content 36.53%, and sulfur-bearing 0.86%, phosphorus 0.95%, silica 1 8.23%, three aoxidize
The iron ore of two aluminium 9.23%, iron contains the iron such as part hematite-limonite, pyrite, ferrosilite simultaneously based on siderite in sample
Mineral.
The iron ore is crushed to 3mm or less；It will be crushed in 3mm ore merging roasters below, control temperature exists
Drying and dewatering is carried out at 400 DEG C, drying time is controlled in 30 min；By the material after drying and dewatering dry grind to -0.074mm with
Under, be added 0.5% stannous chloride, 3% lime, 20% magnesium chloride, 1% calcium chloride, 20% coke and material mixing after,
The pelletizing material as a diameter of 8 mm of pelletizing is prepared with pelletizer；The pelletizing material of 8 mm is dried in roaster,
Drying temperature is 200 DEG C, and pelletizing is dried to and aqueous is less than 8%；By it is aqueous be less than 8% pelletizing material merging roaster in roast
It burns, 1100 DEG C of calcination temperature, roasting time 60min；To carry out water quenching cooling in material merging water after roasting, control material into
The time interval for entering water quenching in water is less than 3min；Material after water quenching is entered into ball mill and carries out ore grinding, ball mill overflow enters
Hydrocyclone, the fineness of hydrocyclone overflow is controlled accounts for 90% or more in -0.019mm；Hydrocyclone overflows strong into magnetic field
Degree is 350OeLow-intensity (magnetic) separator sorting after obtain magnetic product, magnetic product after dehydration and drying iron ore concentrate.Raw ore iron
Material phase analysis, main chemical compositions analysis, technical indicator are shown in Table 1~3 in detail.
1 raw ore Fe clusters analysis result (mass fraction) of table/%
2 raw ore main chemical compositions analysis result (mass fraction) of table/%
3 flow mineral processing index (mass fraction) of table/%
Embodiment 2
Sample ore comes from Yunnan somewhere iron content 34.23%, and sulfur-bearing 0.66%, phosphorus 0.72%, silica 20.68%, three aoxidize
The iron ore of two aluminium 11.22%, iron contains part hematite-limonite, pyrite, ferrosilite etc. simultaneously based on siderite in sample
Iron mineral.
The iron ore is crushed to 3mm or less；It will be crushed in 3mm ore merging roasters below, control temperature exists
Drying and dewatering is carried out at 600 DEG C, drying time is controlled in 60min；By the material after drying and dewatering dry grind to -0.074mm with
Under, be added 3% stannous chloride, 15% lime, 50% magnesium chloride, 3% calcium chloride, 40% coke and material mixing after, use
Pelletizer prepares the pelletizing material as a diameter of 8mm of pelletizing；The pelletizing material of 8mm is dried in roaster, is dried
Temperature is 300 DEG C, and pelletizing is dried to and aqueous is less than 8%；By it is aqueous be less than 8% pelletizing material merging roasting kiln roasting, roasting
Burn 1200 DEG C of temperature, roasting time 90min；Water quenching cooling will be carried out in material merging water after roasting, control material enters water
The time interval of middle water quenching is less than 3min；Material after water quenching is entered into ball mill and carries out ore grinding, ball mill overflow enters waterpower
Cyclone, the fineness of hydrocyclone overflow is controlled accounts for 90% or more in -0.019mm；Hydrocyclone overflows into magnetic field intensity
550OeLow-intensity (magnetic) separator sorting after obtain magnetic product, magnetic product after dehydration and drying iron ore concentrate.Raw ore Fe clusters
Analysis, main chemical compositions analysis, technical indicator are shown in Table 4~6 in detail.
4 raw ore Fe clusters analysis result (mass fraction) of table/%
5 raw ore main chemical compositions analysis result (mass fraction) of table/%
6 flow mineral processing index (mass fraction) of table/%
Embodiment 3
Sample ore comes from Shaanxi somewhere iron content 41.25%, and sulfur-bearing 0.87%, phosphorus 0.98%, silica 21.55%, three aoxidize
The iron ore of two aluminium 14.25%, iron contains part hematite-limonite, pyrite, ferrosilite etc. simultaneously based on siderite in sample
Iron mineral.
The iron ore is crushed to 3mm or less；It will be crushed in 3mm ore merging roasters below, control temperature exists
Drying and dewatering is carried out at 500 DEG C, drying time is controlled in 30min；Material after drying and dewatering is dry grinded to -0.074mm hereinafter,
Be added 2% stannous chloride, 10% lime, 40% magnesium chloride, 2% calcium chloride, 35% coke and material mixing after, use ball
Group's machine prepares the pelletizing material as a diameter of 8mm of pelletizing；The pelletizing material of 8mm is dried in roaster, drying temperature
Degree is 250 DEG C, and pelletizing is dried to and aqueous is less than 8%；By it is aqueous be less than 8% pelletizing material merging roasting kiln roasting, roasting
1150 DEG C of temperature, roasting time 70min；Water quenching cooling will be carried out in material merging water after roasting, control material enters in water
The time interval of water quenching is less than 3min；Material after water quenching is entered into ball mill and carries out ore grinding, ball mill overflow enters waterpower rotation
Device is flowed, the fineness of hydrocyclone overflow is controlled accounts for 90% or more in -0.019mm；Hydrocyclone overflows into magnetic field intensity
400OeLow-intensity (magnetic) separator sorting after obtain magnetic product, magnetic product after dehydration and drying iron ore concentrate.Raw ore Fe clusters
Analysis, main chemical compositions analysis, technical indicator are shown in Table 7~9 in detail.
7 raw ore Fe clusters analysis result (mass fraction) of table/%
8 raw ore main chemical compositions analysis result (mass fraction) of table/%
9 flow mineral processing index (mass fraction) of table/%
Embodiment 4
Sample ore comes from Gansu somewhere iron content 38.64%, and sulfur-bearing 1.05%, phosphorus 1.23%, silica 1 8.15%, three aoxidize
The iron ore of two aluminium 13.65%, iron contains part hematite-limonite, pyrite, ferrosilite etc. simultaneously based on siderite in sample
Iron mineral.
The iron ore is crushed to 3mm or less；It will be crushed in 3mm ore merging roasters below, control temperature exists
Drying and dewatering is carried out at 550 DEG C, drying time is controlled in 40min；Material after drying and dewatering is dry grinded to -0.074mm hereinafter,
Be added 2.5% stannous chloride, 12% lime, 45% magnesium chloride, 1.6% calcium chloride, 35% coke and material mixing after,
The pelletizing material as a diameter of 8mm of pelletizing is prepared with pelletizer；The pelletizing material of 8mm is dried in roaster, is dried
Dry temperature is 250 DEG C, and pelletizing is dried to and aqueous is less than 8%；By it is aqueous be less than 8% pelletizing material merging roasting kiln roasting,
1200 DEG C of calcination temperature, roasting time 75min；Water quenching cooling will be carried out in material merging water after roasting, control material enters
The time interval of water quenching is less than 3min in water；Material after water quenching is entered into ball mill and carries out ore grinding, ball mill overflow enters water
Power cyclone, the fineness of hydrocyclone overflow is controlled accounts for 90% or more in -0.019mm；Hydrocyclone, which overflows, enters magnetic field intensity
For 500OeLow-intensity (magnetic) separator sorting after obtain magnetic product, magnetic product after dehydration and drying iron ore concentrate.Raw ore iron object
Facies analysis, main chemical compositions analysis, technical indicator are shown in Table 10~12 in detail.
10 raw ore Fe clusters analysis result (mass fraction) of table/%
11 raw ore main chemical compositions analysis result (mass fraction) of table/%
12 flow mineral processing index (mass fraction) of table/%
It can be seen that from the result of above-described embodiment direct using composite assistant for high phosphorus high-sulfur high-silicon high aluminium siderite
Roasting-fine grinding-weak magnetic separation process may be implemented preferably to put forward the miscellaneous effect of iron drop, can obtain Iron grade and be more than 75%, phosphorus content
It is less than 1.5% less than 5%, alundum (Al2O3) content less than 0.1%, dioxide-containing silica less than 0.1%, sulfur content, iron recovery is big
In 75% flow beneficiating technology index, better than the technical indicator that existing known technology handles the type iron ore.For China's complexity
Difficulty selects the development and utilization of smelting iron ore resource to open a new approaches.
Claims (4)
1. a kind of difficulty selects smelting siderite resource depth to put forward iron drop general labourer's skill, it is characterised in that specifically include following steps：
（1）Ore materials are finely ground to -0.074mm or less；
（2）0.5%~3% stannous chloride, 3%~15% lime, 20%~50% is added according to mass fraction in ore materials
Magnesium chloride, 1%~3% calcium chloride and 10%~40% reducing agent, after mixing, pelletizing material is made；
（3）The pelletizing drying materials stage：Pelletizing material is dried in roaster, drying temperature is 200~300 DEG C, will
Pelletizing, which is dried to, aqueous is less than 8%；
（4）Firing stage：By it is aqueous be less than 8% pelletizing material merging roasting kiln roasting, 1100~1200 DEG C of calcination temperature,
60~90min of roasting time；
（5）The water quenching cooling stage：Water quenching cooling will be carried out in material merging water after roasting, control material enters water quenching in water
Time interval is less than 3min；
（6）The grind grading stage：Material after water quenching is entered into ball mill and carries out ore grinding, ball mill overflow enters hydraulic cyclone
Device, the fineness of hydrocyclone overflow is controlled accounts for 90% or more in -0.019mm；
（7）The low intensity magnetic separation stage：Classifier overflow is transported to low-intensity (magnetic) separator, the magnetic field intensity of magnetic separator is in 350~550Oe,
Magnetic product is obtained by low intensity magnetic separation；
（8）Magnetic product dehydrates the stage：Magnetic product is dry that iron ore concentrate, obtained iron ore concentrate produce after filtering means dehydration
Product iron content ＞ 75%, phosphorous ＜ 0.1%, sulphur ＜ 0.1%, silica ＜ 5%, alundum (Al2O3) ＜ 2%, iron recovery ＞ 85%.
2. a kind of difficulty according to claim 1 selects smelting siderite resource depth to put forward iron drop general labourer's skill, it is characterised in that：Institute
It is coke to state reducing agent.
3. a kind of difficulty according to claim 1 selects smelting siderite resource depth to put forward iron drop general labourer's skill, it is characterised in that：Institute
It states before ore materials are finely ground and first passes through：Muck and drying and dewatering；
The muck stage：Ore materials are crushed to 3mm or less as needed；
The drying and dewatering stage：It will be crushed in 3mm ore materials merging roasters below, control temperature is at 400~600 DEG C
Drying and dewatering is carried out, drying time is controlled in 30~60min.
4. a kind of difficulty according to claim 1 selects smelting siderite resource depth to put forward iron drop general labourer's skill, it is characterised in that：Institute
State step（2）In pelletizing material prepared by pelletizer, the pelletizing material of a diameter of 8mm is made.
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| CN1995411A (en) * | 2006-12-26 | 2007-07-11 | 周云富 | Process for producing iron finished ore powder utilizing low grade siderite |
| CN101457288B (en) * | 2008-12-29 | 2010-09-01 | 昆明晶石矿冶有限公司 | Method for reducing phosphorus by chloridization separation-weak of high phosphor iron ore |
| CN101514401B (en) * | 2009-03-18 | 2010-12-01 | 中南大学 | Method for efficiently concentrating cobalt and nickel from low-grade nickeliferous laterite ore |
| CN101748271A (en) * | 2009-12-31 | 2010-06-23 | 李春文 | Calcining magnetic separation process for iron ore |
| CN101879599B (en) * | 2010-06-04 | 2011-12-14 | 昆明晶石矿冶有限公司 | Method for preparing reductive iron powder and high-purity refined iron powder by using iron ores |
| US8545594B2 (en) * | 2011-08-01 | 2013-10-01 | Superior Mineral Resources LLC | Ore beneficiation |
| AU2012290345B2 (en) * | 2011-08-01 | 2017-03-16 | Superior Mineral Resources LLC | Ore beneficiation |
| CN105018721B (en) * | 2015-08-06 | 2018-01-26 | 攀钢集团攀枝花钢铁研究院有限公司 | It is a kind of that iron, vanadium, the method for titanium are separated from vanadium titano-magnetite |
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