CN107686886A - A kind of method of the suspension roasting separation ferro-aluminum of high-iron bauxite - Google Patents
A kind of method of the suspension roasting separation ferro-aluminum of high-iron bauxite Download PDFInfo
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- CN107686886A CN107686886A CN201710588620.5A CN201710588620A CN107686886A CN 107686886 A CN107686886 A CN 107686886A CN 201710588620 A CN201710588620 A CN 201710588620A CN 107686886 A CN107686886 A CN 107686886A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Abstract
A kind of method of the suspension roasting separation ferro-aluminum of high-iron bauxite, belongs to technical field of mineral processing, carries out according to the following steps：(1) by high-iron bauxite pulverizing and jevigating；(2) one section of low intensity magnetic separation is carried out；(3) one stages of magnetic separation mine tailings carry out oxidizing roasting；(4) oxidation fine ore is put into reduction roaster, carries out reduction roasting；(5) reduction miberal powder is subjected to two sections of low intensity magnetic separations；(6) two stages of magnetic separation mine tailings are subjected to high intensity magnetic separation；High intensity magnetic separation concentrate and two sections of weak magnetic concentrate selections are incorporated as iron ore concentrate finished product.Present invention process flow is simple, and equipment treating capacity is big, and product property is easy to control, industrial applications energy-conserving and environment-protective, and easily realizes maximization.
Description
Technical field
The invention belongs to technical field of mineral processing, the suspension roasting separation ferro-aluminum of more particularly to a kind of high-iron bauxite
Method.
Background technology
The high-quality bauxite resource in China is increasingly deficient due to the huge consumption of aluminum oxide industry.And China is present largely
Not yet realization effectively utilizes the high high swage bauxite resource of iron content on a large scale, bauxite owner in high swage bauxite resource
To be gibbsite, diaspore, iron mineral is mainly bloodstone, goethite, limonite, siderite etc., realizes high swage
Effective utilization of iron, aluminium two spike-type cultivars in bauxite, there is important meaning to alleviating the insufficient situation of the self-produced iron in China, aluminum ore
Justice.But because the difference of high swage bauxite diagenetic pattern is different with the place of production, property and composition composition are had any different more, and there has been no height
Effect technology realizes the comprehensive utilization of the type ore.It is current more using high intensity magnetic separation separation iron mineral therein, or using flotation point
From iron mineral therein, but conventional magnetic separation and flotation can only be directed to single type high ferro of the iron mineral composition for Magnetite or hematite
Bauxite, and separative efficiency is very low, it is impossible to ferro-aluminum is efficiently separated, can not popularization and application.
The content of the invention
It is an object of the invention to provide the method that a kind of suspension roasting of high-iron bauxite separates ferro-aluminum, by by high ferro aluminium
Tu Kuang crushes rear oxidation reduction roasting, then the method for carrying out strong and weak magnetic separation, while simplifying technique, improves separative efficiency and iron ore
Grade.
The method of the present invention is carried out according to the following steps：
1st, it is 5~20mm high-iron bauxite to be crushed into granularity, then ore grinding to granularity -0.074mm part account for gross weight
More than 50%, or ore grinding to granularity -0.038mm part accounts for gross weight more than 80%, obtains miberal powder；
2nd, miberal powder is subjected to one section of low intensity magnetic separation, 1000~2000Oe of magnetic field intensity, obtains a stages of magnetic separation concentrate and one section of magnetic
Select mine tailing；
3rd, a stages of magnetic separation mine tailing is placed in roaster, is passed through coal gas and air, a stages of magnetic separation mine tailing is in suspension
State, oxidizing roasting is carried out at 800~950 DEG C, 5~20min of roasting time, iron mineral is changed into Fe2O3, and remove water and its
His volatile matter, obtain oxidation miberal powder；The flow of wherein air and coal gas is that stages of magnetic separation mine tailing per ton is passed through 5~25m3/h；
4th, using reduction roaster, the shell of reduction roaster is interior to be provided with upper spacer, air distribution plate and lower clapboard；Upper spacer hangs down
Straight to place, its top margin and two sides are together with cage connection；Air distribution plate is located at below upper spacer and horizontal positioned；Lower clapboard
Top margin linked together with air distribution plate, its base and two sides are together with cage connection；And upper spacer and lower clapboard
On same vertical plane；Gap between the base of upper spacer and air distribution plate is as material channel；Upper spacer is by reduction roasting
Stove top is divided into feed space and discharge chamber, and feed space is connected with discharge chamber by material channel, and feed space top is provided with charging
Mouthful, discharge chamber top is provided with discharging opening；Reduction roaster bottom is divided into nitrogen chamber and reduction air chamber by lower clapboard and air distribution plate,
Nitrogen chamber is relative up and down with feed space, reduces air chamber and discharge chamber is relative up and down；Oxidation fine ore is put into reduction roaster,
The feed space of reductor declines, and enters the discharge chamber of reductor, is passed through nitrogen and also Primordial Qi, work of the oxidation fine ore in also Primordial Qi
Suspended state is in lower, reduction roasting is carried out to oxidation miberal powder in reduction room, sintering temperature is 450~700 DEG C, roasting time
For 3~10min, roasted ore is obtained；Wherein also Primordial Qi is CO, H2Or coal gas, the also flow of Primordial Qi are led to by oxidation miberal powder per ton
The CO and H entered2Total amount be 1~15m3/h；Nitrogen and the also ratio of Primordial Qi are 1:1~5:1；
5th, reduction miberal powder is subjected to two sections of low intensity magnetic separations, 1000~2000Oe of magnetic field intensity, obtains two stages of magnetic separation concentrate and two
Stages of magnetic separation mine tailing；The main component of two stages of magnetic separation concentrate is magnetic iron ore and γ-Fe2O3；
6th, two stages of magnetic separation mine tailings are subjected to high intensity magnetic separation, 4000~10000Oe of magnetic field intensity, obtain high intensity magnetic separation concentrate and strong magnetic
Select mine tailing；High intensity magnetic separation concentrate and two sections of weak magnetic concentrate selections are incorporated as iron ore concentrate finished product.
The Iron grade TFe of above-mentioned high-iron bauxite is 19~28%, by weight percentage containing Al2O345~52%,
SiO25~7%.
The Iron grade TFe of above-mentioned iron ore concentrate finished product is 56~64%.
An above-mentioned stages of magnetic separation mine tailing and high intensity magnetic separation mine tailing are incorporated as bauxite, and bauxite contains by weight percentage
Fe2O31~4%, Al2O368~74%.
Compared with existing high-iron bauxite method of comprehensive utilization, the features of the present invention and advantage are：
The high-iron bauxite containing different type iron mineral, iron mineral can be effectively handled compared to conventional magnetic separation, floatation process
To realize that iron, aluminium efficiently separate when goethite, bloodstone, limonite, siderite, pyrite etc.；The aluminium isolated contains
Measuring high product from failing can meet to produce aluminum oxide industry requirement；
High-iron bauxite is calcined using gas, it is high compared to conventional roasting means heat production mass-transfer efficiency, to bauxite
The iron mineral reduction that middle particulate is contaminated is abundant；
Using the method for roasting for pre-oxidizing-restoring, it is more equal that oxidation and the combination of reduction process can obtain property
One product.
Present invention process flow is simple, and equipment treating capacity is big, and product property is easy to control, industrial applications energy-conserving and environment-protective, and
Easily realize maximization.
Brief description of the drawings
Fig. 1 is that the suspension roasting of the high-iron bauxite of the present invention separates the method flow schematic diagram of ferro-aluminum；
Fig. 2 is the oxidizing roasting part schematic flow sheet in Fig. 1；
Fig. 3 is the reduction roaster structural representation that the present invention uses；In figure, 1, shell, 2, upper spacer, 3, air distribution plate,
4th, lower clapboard, 5, charging aperture, 6, discharging opening, 7, nitrogen inlet, 8, also Primordial Qi import.
Embodiment
5~200mm of granularity of the high-iron bauxite used in the embodiment of the present invention.
The rate of recovery 60~90% of iron in the embodiment of the present invention.
Crushed in the embodiment of the present invention and use jaw crusher, ore grinding uses overflowball mill.
Low intensity magnetic separation uses wet type weak magnetic separator in the embodiment of the present invention.
High intensity magnetic separation is using high gradient pulsation intensity magnetic separator in the embodiment of the present invention.
The coal gas used in the embodiment of the present invention contains H by percent by volume2>=35%；CO >=15%；O2≤ 0.5%.
Embodiment 1
Flow is as shown in Figure 1；
It is 5~20mm that high-iron bauxite is crushed into granularity, then ore grinding to granularity -0.074mm part account for gross weight
50%；
Miberal powder is subjected to one section of low intensity magnetic separation, magnetic field intensity 1000Oe, obtains a stages of magnetic separation concentrate and a stages of magnetic separation mine tailing；
One stages of magnetic separation mine tailing is placed in roaster, is passed through coal gas and air, a stages of magnetic separation mine tailing is in suspended state,
Oxidizing roasting is carried out at 800 DEG C, roasting time 20min, iron mineral is changed into Fe2O3, and water and other volatile matters are removed, obtain
Miberal powder must be aoxidized；The flow of wherein air and coal gas is that stages of magnetic separation mine tailing per ton is passed through 15m3/h；Aoxidize flow such as Fig. 2 institutes
Show；
Using reduction roaster, structure in shell as shown in figure 3, be provided with upper spacer, air distribution plate and lower clapboard；Upper spacer hangs down
Straight to place, its top margin and two sides are together with cage connection；Air distribution plate is located at below upper spacer and horizontal positioned；Lower clapboard
Top margin linked together with air distribution plate, its base and two sides are together with cage connection；And upper spacer and lower clapboard
On same vertical plane；Gap between the base of upper spacer and air distribution plate is as material channel；Upper spacer is by reduction roasting
Stove top is divided into feed space and discharge chamber, and feed space is connected with discharge chamber by material channel, and feed space top is provided with charging
Mouthful, discharge chamber top is provided with discharging opening；Reduction roaster bottom is divided into nitrogen chamber and reduction air chamber by lower clapboard and air distribution plate,
Nitrogen chamber is relative up and down with feed space, reduces air chamber and discharge chamber is relative up and down；Oxidation fine ore is put into reduction roaster,
The feed space of reductor declines, and enters the discharge chamber of reductor, is passed through nitrogen and also Primordial Qi, work of the oxidation fine ore in also Primordial Qi
Suspended state is in lower, reduction roasting is carried out to oxidation miberal powder in reduction room, sintering temperature is 450 DEG C, and roasting time is
10min, obtain roasted ore；Wherein also Primordial Qi is CO, and the CO that also flow of Primordial Qi is passed through by oxidation miberal powder per ton is 10m3/h；Nitrogen
Gas and the also ratio of Primordial Qi are 1:1；
Reduction miberal powder is subjected to two sections of low intensity magnetic separations, magnetic field intensity 1000Oe, obtains two stages of magnetic separation concentrate and two stages of magnetic separation tails
Ore deposit；The main component of two stages of magnetic separation concentrate is magnetic iron ore and γ-Fe2O3；
Two stages of magnetic separation mine tailings are subjected to high intensity magnetic separation, magnetic field intensity 4000Oe, obtain high intensity magnetic separation concentrate and high intensity magnetic separation mine tailing；Will
High intensity magnetic separation concentrate and two sections of weak magnetic concentrate selections are incorporated as iron ore concentrate finished product；
The Iron grade TFe of the high-iron bauxite used is 19%, by weight percentage containing Al2O352%, SiO27%；Obtain
The Iron grade TFe of the iron ore concentrate finished product obtained is 56%；One stages of magnetic separation mine tailing and high intensity magnetic separation mine tailing are incorporated as bauxite, bauxite
Contain Fe by weight percentage2O31%, Al2O368%.
Embodiment 2
With embodiment 1, difference is method：
(1) it is 5~20mm high-iron bauxite to be crushed into granularity, then ore grinding to granularity -0.074mm part account for gross weight
60%；
The magnetic field intensity 2000Oe of (2) one sections of low intensity magnetic separations；
(3) oxidizing roasting 5min are carried out at 950 DEG C, the flow of air and coal gas is that stages of magnetic separation mine tailing per ton is passed through
20m3/h；
(4) reduction roasting temperature is 700 DEG C, time 3min, and also Primordial Qi is H2, and also the flow of Primordial Qi presses oxide ore per ton
The H that powder is passed through2Total amount be 5m3/h；Nitrogen and the also ratio of Primordial Qi are 5:1；
The magnetic field intensity 2000Oe of (5) two sections of low intensity magnetic separations, the magnetic field intensity 10000Oe of high intensity magnetic separation；
(6) the Iron grade TFe of the high-iron bauxite used is 28%, by weight percentage containing Al2O345%, SiO2
5%；The Iron grade TFe of the iron ore concentrate finished product of acquisition is 64%；Bauxite contains Fe by weight percentage2O34%, Al2O3
74%.
Embodiment 3
With embodiment 1, difference is method：
(1) it is 5~20mm high-iron bauxite to be crushed into granularity, then ore grinding to granularity -0.038mm part account for gross weight
80%；
The magnetic field intensity 1400Oe of (2) one sections of low intensity magnetic separations；
(3) oxidizing roasting 15min are carried out at 850 DEG C, the flow of air and coal gas is that stages of magnetic separation mine tailing per ton is passed through
5m3/h；
(4) reduction roasting temperature is 500 DEG C, time 8min, and also Primordial Qi is coal gas, and the flow of also Primordial Qi presses oxygen per ton
Change CO and H that miberal powder is passed through2Total amount be 15m3/h；Nitrogen and the also ratio of Primordial Qi are 3:1；
The magnetic field intensity 1400Oe of (5) two sections of low intensity magnetic separations, the magnetic field intensity 6000Oe of high intensity magnetic separation；
(6) the Iron grade TFe of the high-iron bauxite used is 22%, by weight percentage containing Al2O350%, SiO2
6%；The Iron grade TFe of the iron ore concentrate finished product of acquisition is 61%；Bauxite contains Fe by weight percentage2O32%, Al2O3
70%.
Embodiment 4
With embodiment 1, difference is method：
(1) it is 5~20mm high-iron bauxite to be crushed into granularity, then ore grinding to granularity -0.038mm part account for gross weight
85%；
The magnetic field intensity 1600Oe of (2) one sections of low intensity magnetic separations；
(3) oxidizing roasting 10min are carried out at 900 DEG C, the flow of air and coal gas is that stages of magnetic separation mine tailing per ton is passed through
25m3/h；
(4) reduction roasting temperature is 600 DEG C, time 5min, and also Primordial Qi is coal gas, and the flow of also Primordial Qi presses oxygen per ton
Change CO and H that miberal powder is passed through2Total amount be 1m3/h；Nitrogen and the also ratio of Primordial Qi are 2:1；
The magnetic field intensity 1600Oe of (5) two sections of low intensity magnetic separations, the magnetic field intensity 8000Oe of high intensity magnetic separation；
(6) the Iron grade TFe of the high-iron bauxite used is 25%, by weight percentage containing Al2O349%, SiO2
6%；The Iron grade TFe of the iron ore concentrate finished product of acquisition is 58%；Bauxite contains Fe by weight percentage2O33%, Al2O3
72%.
Claims (4)
1. the method for the suspension roasting separation ferro-aluminum of a kind of high-iron bauxite, it is characterised in that carry out according to the following steps：
(1) it is 5~20mm high-iron bauxite to be crushed into granularity, then ore grinding to granularity -0.074mm part account for gross weight 50%
More than, or ore grinding to granularity -0.038mm part accounts for gross weight more than 80%, obtains miberal powder；
(2) miberal powder is subjected to one section of low intensity magnetic separation, 1000~2000Oe of magnetic field intensity, obtains a stages of magnetic separation concentrate and a stages of magnetic separation tail
Ore deposit；
(3) a stages of magnetic separation mine tailing is placed in roaster, is passed through coal gas and air, a stages of magnetic separation mine tailing is in suspended state,
Oxidizing roasting is carried out at 800~950 DEG C, 5~20min of roasting time, iron mineral is changed into Fe2O3, and remove water and waved with other
Hair point, obtain oxidation miberal powder；The flow of wherein air and coal gas is that stages of magnetic separation mine tailing per ton is passed through 5~25m3/h；
(4) reduction roaster is used, upper spacer, air distribution plate and lower clapboard are provided with the shell of reduction roaster；Upper spacer is vertical
Place, its top margin and two sides are together with cage connection；Air distribution plate is located at below upper spacer and horizontal positioned；Lower clapboard
Top margin links together with air distribution plate, and its base and two sides are together with cage connection；And upper spacer and lower clapboard position
In on same vertical plane；Gap between the base of upper spacer and air distribution plate is as material channel；Upper spacer is by reduction roaster
Top is divided into feed space and discharge chamber, and feed space is connected with discharge chamber by material channel, and feed space top is provided with charging aperture,
Discharge chamber top is provided with discharging opening；Reduction roaster bottom is divided into nitrogen chamber and reduction air chamber, nitrogen by lower clapboard and air distribution plate
Air chamber is relative up and down with feed space, reduces air chamber and discharge chamber is relative up and down；Oxidation fine ore is put into reduction roaster, also
The feed space of prototype declines, and enters the discharge chamber of reductor, is passed through nitrogen and also Primordial Qi, effect of the oxidation fine ore in also Primordial Qi
Suspended state is in down, reduction roasting is carried out to oxidation miberal powder in reduction room, sintering temperature is 450~700 DEG C, and roasting time is
3~10min, obtain roasted ore；Wherein also Primordial Qi is CO, H2Or coal gas, the also flow of Primordial Qi are passed through by oxidation miberal powder per ton
CO and H2Total amount be 1~15m3/h；Nitrogen and the also ratio of Primordial Qi are 1:1~5:1；
(5) reduction miberal powder is subjected to two sections of low intensity magnetic separations, 1000~2000Oe of magnetic field intensity, obtains two stages of magnetic separation concentrate and two sections of magnetic
Select mine tailing；The main component of two stages of magnetic separation concentrate is magnetic iron ore and γ-Fe2O3；
(6) two stages of magnetic separation mine tailings are subjected to high intensity magnetic separation, 4000~10000Oe of magnetic field intensity, obtain high intensity magnetic separation concentrate and high intensity magnetic separation
Mine tailing；High intensity magnetic separation concentrate and two sections of weak magnetic concentrate selections are incorporated as iron ore concentrate finished product.
A kind of 2. method of the suspension roasting separation ferro-aluminum of high-iron bauxite according to claim 1, it is characterised in that institute
The Iron grade TFe for the high-iron bauxite stated is 19~28%, by weight percentage containing Al2O345~52%, SiO25~7%.
A kind of 3. method of the suspension roasting separation ferro-aluminum of high-iron bauxite according to claim 1, it is characterised in that institute
The Iron grade TFe for the iron ore concentrate finished product stated is 56~64%.
A kind of 4. method of the suspension roasting separation ferro-aluminum of high-iron bauxite according to claim 1, it is characterised in that institute
The stages of magnetic separation mine tailing and high intensity magnetic separation mine tailing stated are incorporated as bauxite, and bauxite contains Fe by weight percentage2O31~4%,
Al2O368~74%.
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| CN110512081A (en) * | 2019-09-19 | 2019-11-29 | 辽宁东大矿冶工程技术有限公司 | The method of iron red mud high magnetic pre-selection-suspended state direct-reduction-high temperature melting point |
| CN110510646A (en) * | 2019-09-25 | 2019-11-29 | 东北大学 | High-iron bauxite suspended state prereduction-electro-smelting separation and recovery iron aluminium method |
| CN111593197A (en) * | 2020-05-29 | 2020-08-28 | 东北大学 | Method for removing iron from bauxite by suspension roasting dehydration dry method |
| CN112474715A (en) * | 2020-11-05 | 2021-03-12 | 西南科技大学 | Method for obtaining gamma-Fe by using copper ore dressing tailings2O3Method for shaping iron concentrate powder |
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| CN112474715A (en) * | 2020-11-05 | 2021-03-12 | 西南科技大学 | Method for obtaining gamma-Fe by using copper ore dressing tailings2O3Method for shaping iron concentrate powder |
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|---|---|
| CN107686886B (en) | 2019-06-25 |
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