CN107686886B - 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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Abstract
A kind of method of the suspension roasting separation ferro-aluminum of high-iron bauxite, belongs to technical field of mineral processing, sequentially includes the following steps: (1) for high-iron bauxite pulverizing and jevigating；(2) one section of low intensity magnetic separation is carried out；(3) one stages of magnetic separation 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 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 process is simple, and equipment treating capacity is big, and product property is easy to control, industrial applications energy conservation and environmental protection, and easily realizes enlargement.
Description
Technical field
The invention belongs to technical field of mineral processing, in particular to the suspension roasting separation ferro-aluminum of a kind of high-iron bauxite
Method.
Background technique
The good bauxite resource in China due to aluminum oxide industry huge consumption, it is increasingly deficient.And China exists largely
The high high swage bauxite resource of iron content not yet realizes effective use, bauxite owner in high swage bauxite resource on a large scale
It to be gibbsite, diaspore, iron mineral is mainly bloodstone, goethite, limonite, siderite etc., realizes high swage
The effective use of iron, aluminium two kinds of resources in bauxite has important meaning to the situation for alleviating the self-produced iron in China, aluminum ore insufficient supply
Justice.But since the difference of high swage bauxite diagenetic pattern is different with the place of production, property and at having any different be grouped as, there has been no height more
Effect technology realizes the comprehensive utilization of the type ore.High intensity magnetic separation is currently mostly used to separate iron mineral therein, or using flotation point
From iron mineral therein, but conventional magnetic separation and flotation can only become the single type high-speed rail of Magnetite or hematite for iron mineral group
Bauxite, and separative efficiency is very low, cannot efficiently separate ferro-aluminum, can not promote and apply.
Summary of the invention
The object of the present invention is to provide a kind of methods of the suspension roasting of high-iron bauxite separation ferro-aluminum, by by high-speed rail aluminium
Redox roasting after Tu Kuang is broken, then the method for carrying out strong and weak magnetic separation while simplifying technique, improve separative efficiency and iron ore
Grade.
Method of the invention sequentially includes the following steps:
1, high-iron bauxite is crushed to granularity is 5~20mm, then the part of ore grinding to granularity -0.074mm account for total weight
50% or more or the part of ore grinding to granularity -0.038mm account for 80% or more total weight, obtain miberal powder；
2, miberal powder is subjected to one section of low intensity magnetic separation, 1000~2000Oe of magnetic field strength obtains a stages of magnetic separation concentrate and one section of magnetic
Select tailing；
3, a stages of magnetic separation tailing is placed in roaster, is passed through coal gas and air, a stages of magnetic separation tailing is made to be in suspension
State, in 800~950 DEG C of progress oxidizing roastings, 5~20min of calcining time makes iron mineral be changed into Fe2O3, and remove water and its
His volatile matter obtains oxidation miberal powder；Wherein the flow of air and coal gas is that a stages of magnetic separation tailing per ton is passed through 5~25m3/h；
4, using reduction roaster, the shell of reduction roaster is interior to be equipped with upper spacer, air distribution plate and lower clapboard；Upper spacer hangs down
Straight to place, 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 link together with air distribution plate, bottom edge and two sides are together with cage connection；And upper spacer and lower clapboard
On the same vertical plane；Gap between the bottom edge and air distribution plate of upper spacer is as material channel；Upper spacer is by reduction roasting
Furnace top is divided into feed space and discharge chamber, and feed space is connected to discharge chamber by material channel, and feed space top is equipped with charging
Mouthful, discharge chamber top is equipped with discharge port；Reduction roaster lower part is divided into nitrogen chamber and restores gas chamber by lower clapboard and air distribution plate,
Nitrogen chamber is opposite up and down with feed space, restores gas chamber and discharge chamber is opposite 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
It is in suspended state with lower, reduction roasting is carried out to oxidation miberal powder in reduction room, maturing temperature is 450~700 DEG C, calcining time
For 3~10min, roasted ore is obtained；Wherein also Primordial Qi is CO, H2Or coal gas, the also flow of Primordial Qi are logical by oxidation miberal powder per ton
The CO and H entered2Total amount be 1~15m3/h；The ratio of nitrogen and also Primordial Qi is 1:1~5:1；
5, reduction miberal powder is subjected to two sections of low intensity magnetic separations, 1000~2000Oe of magnetic field strength obtains two stages of magnetic separation concentrate and two
Stages of magnetic separation tailing；The main component of two stages of magnetic separation concentrate is magnetic iron ore and γ-Fe2O3；
6, two stages of magnetic separation tailings are subjected to high intensity magnetic separation, 4000~10000Oe of magnetic field strength obtains high intensity magnetic separation concentrate and strong magnetic
Select 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%, contains Al by weight percentage2O345~52%,
SiO25~7%.
The Iron grade TFe of above-mentioned iron ore concentrate finished product is 56~64%.
An above-mentioned stages of magnetic separation tailing and high intensity magnetic separation 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 as follows:
The high-iron bauxite containing different type iron mineral, iron mineral can be effectively treated compared to conventional magnetic separation, floatation process
To be able to achieve iron whens goethite, bloodstone, limonite, siderite, pyrite etc., aluminium efficiently separates；The aluminium isolated contains
Measuring high product from failing can satisfy production aluminum oxide industry requirement；
High-iron bauxite is roasted using gas, it is high compared to conventional roasting means heat production mass-transfer efficiency, to bauxite
The iron mineral reduction of middle particulate dip dyeing 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 process is simple, and equipment treating capacity is big, and product property is easy to control, industrial applications energy conservation and environmental protection, and
Easily realize enlargement.
Detailed description of the invention
Fig. 1 is that the suspension roasting of high-iron bauxite of the invention separates the method flow schematic diagram of ferro-aluminum；
Fig. 2 is the oxidizing roasting part flow diagram in Fig. 1；
Fig. 3 is the reduction roaster structural schematic diagram that the present invention uses；In figure, 1, shell, 2, upper spacer, 3, air distribution plate,
4, lower clapboard, 5, feed inlet, 6, discharge port, 7, nitrogen inlet, 8, also Primordial Qi import.
Specific 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.
It is crushed in the embodiment of the present invention and uses 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
Process is as shown in Figure 1；
It is 5~20mm that high-iron bauxite, which is crushed to granularity, then the part of ore grinding to granularity -0.074mm account for total weight
50%；
Miberal powder is subjected to one section of low intensity magnetic separation, magnetic field strength 1000Oe obtains a stages of magnetic separation concentrate and a stages of magnetic separation tailing；
One stages of magnetic separation tailing is placed in roaster, coal gas and air are passed through, a stages of magnetic separation tailing is made to be in suspended state,
In 800 DEG C of progress oxidizing roastings, calcining time 20min makes iron mineral be changed into Fe2O3, and water and other volatile matters are removed, it obtains
Miberal powder must be aoxidized；Wherein the flow of air and coal gas is that a stages of magnetic separation tailing per ton is passed through 15m3/h；Aoxidize process such as Fig. 2 institute
Show；
Using reduction roaster, structure is as shown in figure 3, be equipped with upper spacer, air distribution plate and lower clapboard in shell；Upper spacer hangs down
Straight to place, 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 link together with air distribution plate, bottom edge and two sides are together with cage connection；And upper spacer and lower clapboard
On the same vertical plane；Gap between the bottom edge and air distribution plate of upper spacer is as material channel；Upper spacer is by reduction roasting
Furnace top is divided into feed space and discharge chamber, and feed space is connected to discharge chamber by material channel, and feed space top is equipped with charging
Mouthful, discharge chamber top is equipped with discharge port；Reduction roaster lower part is divided into nitrogen chamber and restores gas chamber by lower clapboard and air distribution plate,
Nitrogen chamber is opposite up and down with feed space, restores gas chamber and discharge chamber is opposite 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
It is in suspended state with lower, reduction roasting is carried out to oxidation miberal powder in reduction room, maturing temperature is 450 DEG C, and calcining time is
10min obtains roasted ore；Wherein also Primordial Qi is CO, and also the flow of Primordial Qi is 10m by the CO that oxidation miberal powder per ton is passed through3/h；Nitrogen
The ratio of gas and also Primordial Qi is 1:1；
Reduction miberal powder is subjected to two sections of low intensity magnetic separations, magnetic field strength 1000Oe obtains two stages of magnetic separation concentrate and two stages of magnetic separation tails
Mine；The main component of two stages of magnetic separation concentrate is magnetic iron ore and γ-Fe2O3；
Two stages of magnetic separation tailings are subjected to high intensity magnetic separation, magnetic field strength 4000Oe obtains high intensity magnetic separation concentrate and high intensity magnetic separation tailing；It 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 contains Al by weight percentage for 19%2O352%, SiO27%；It obtains
The Iron grade TFe of the iron ore concentrate finished product obtained is 56%；One stages of magnetic separation tailing and high intensity magnetic separation tailing are incorporated as bauxite, bauxite
Contain Fe by weight percentage2O31%, Al2O368%.
Embodiment 2
With embodiment 1, difference is method:
(1) high-iron bauxite is crushed to granularity is 5~20mm, then the part of ore grinding to granularity -0.074mm account for total weight
60%；
The magnetic field strength 2000Oe of (2) one sections of low intensity magnetic separations；
(3) in 950 DEG C of progress oxidizing roasting 5min, the flow of air and coal gas is that stages of magnetic separation tailing per ton is passed through
20m3/h；
(4) reduction roasting temperature is 700 DEG C, time 3min, and also Primordial Qi is H2, also the flow of Primordial Qi is by oxide ore per ton
The H that powder is passed through2Total amount be 5m3/h；The ratio of nitrogen and also Primordial Qi is 5:1；
The magnetic field strength 2000Oe of (5) two sections of low intensity magnetic separations, the magnetic field strength 10000Oe of high intensity magnetic separation；
(6) the Iron grade TFe of the high-iron bauxite used contains Al by weight percentage for 28%2O345%, 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) high-iron bauxite is crushed to granularity is 5~20mm, then the part of ore grinding to granularity -0.038mm account for total weight
80%；
The magnetic field strength 1400Oe of (2) one sections of low intensity magnetic separations；
(3) in 850 DEG C of progress oxidizing roasting 15min, the flow of air and coal gas is that stages of magnetic separation 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 also flow of Primordial Qi presses oxygen per ton
Change CO and H that miberal powder is passed through2Total amount be 15m3/h；The ratio of nitrogen and also Primordial Qi is 3:1；
The magnetic field strength 1400Oe of (5) two sections of low intensity magnetic separations, the magnetic field strength 6000Oe of high intensity magnetic separation；
(6) the Iron grade TFe of the high-iron bauxite used contains Al by weight percentage for 22%2O350%, 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) high-iron bauxite is crushed to granularity is 5~20mm, then the part of ore grinding to granularity -0.038mm account for total weight
85%；
The magnetic field strength 1600Oe of (2) one sections of low intensity magnetic separations；
(3) in 900 DEG C of progress oxidizing roasting 10min, the flow of air and coal gas is that stages of magnetic separation 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 also flow of Primordial Qi presses oxygen per ton
Change CO and H that miberal powder is passed through2Total amount be 1m3/h；The ratio of nitrogen and also Primordial Qi is 2:1；
The magnetic field strength 1600Oe of (5) two sections of low intensity magnetic separations, the magnetic field strength 8000Oe of high intensity magnetic separation；
(6) the Iron grade TFe of the high-iron bauxite used contains Al by weight percentage for 25%2O349%, 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 (1)
1. a kind of method of the suspension roasting separation ferro-aluminum of high-iron bauxite, it is characterised in that sequentially include the following steps:
(1) by high-iron bauxite be crushed to granularity be 5 ~ 20mm, then ore grinding to granularity -0.074mm part account for total weight 50% with
On, obtain miberal powder；The Iron grade TFe of the high-iron bauxite is 19 ~ 28%, contains Al by weight percentage2O345 ~ 52%,
SiO25~7%；
(2) miberal powder is subjected to one section of low intensity magnetic separation, 1000 ~ 2000Oe of magnetic field strength obtains a stages of magnetic separation concentrate and a stages of magnetic separation tail
Mine；
(3) a stages of magnetic separation tailing is placed in roaster, is passed through coal gas and air, a stages of magnetic separation tailing is made to be in suspended state,
In 800 ~ 950 DEG C of progress oxidizing roastings, 5 ~ 20min of calcining time makes iron mineral be changed into Fe2O3, and remove water and other volatilizations
Point, obtain oxidation miberal powder；Wherein the flow of air and coal gas is that a stages of magnetic separation tailing per ton is passed through 5 ~ 25m3/ h；
(4) reduction roaster is used, is equipped with upper spacer, air distribution plate and lower clapboard in the shell of reduction roaster；Upper spacer is vertical
It places, 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 bottom edge and two sides are together with cage connection；And upper spacer and lower clapboard position
In on the same vertical plane；Gap between the bottom edge and air distribution plate of upper spacer is as material channel；Upper spacer is by reduction roaster
Top is divided into feed space and discharge chamber, and feed space is connected to discharge chamber by material channel, and feed space top is equipped with feed inlet,
Discharge chamber top is equipped with discharge port；Reduction roaster lower part is divided into nitrogen chamber and restores gas chamber, nitrogen by lower clapboard and air distribution plate
Gas chamber is opposite up and down with feed space, restores gas chamber and discharge chamber is opposite up and down；Oxidation fine ore is put into reduction roaster, also
The feed space of former roaster declines, and enters the discharge chamber of reduction roaster, is passed through nitrogen and also Primordial Qi, and oxidation fine ore is restoring
It is in suspended state under the action of gas, reduction roasting is carried out to oxidation miberal powder in discharge chamber, maturing temperature is 450 ~ 700 DEG C, roasting
The burning time is 3 ~ 10min, obtains roasted ore；Wherein also Primordial Qi is CO, H2Or coal gas, the also flow of Primordial Qi press oxide ore per ton
The CO and H that powder is passed through2Total amount be 1 ~ 15 m3/ h；The ratio of nitrogen and also Primordial Qi is 1:1 ~ 5:1；
(5) reduction miberal powder is subjected to two sections of low intensity magnetic separations, 1000 ~ 2000Oe of magnetic field strength obtains two stages of magnetic separation concentrate and two sections of magnetic
Select tailing；The main component of two stages of magnetic separation concentrate is magnetic iron ore and γ-Fe2O3；
(6) two stages of magnetic separation tailings are subjected to high intensity magnetic separation, 4000 ~ 10000Oe of magnetic field strength obtains high intensity magnetic separation concentrate and high intensity magnetic separation tail
Mine；High intensity magnetic separation concentrate and two stages of magnetic separation concentrate are incorporated as iron ore concentrate finished product；The Iron grade TFe of the iron ore concentrate finished product is
56~64%；The rate of recovery 60 ~ 90% of iron；The one stages of magnetic separation tailing and high intensity magnetic separation tailing are incorporated as bauxite, and bauxite is pressed
Weight percent contains Fe2O31 ~ 4%, Al2O3 68~74%。
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110484734A (en) * | 2019-09-19 | 2019-11-22 | 辽宁东大矿冶工程技术有限公司 | A kind of method of iron red mud high magnetic pre-selection-drastic reduction melting |
| CN110510646B (en) * | 2019-09-25 | 2021-11-23 | 东北大学 | Method for recovering iron and aluminum by high-iron bauxite suspension state prereduction-electric furnace smelting separation |
| CN111593197A (en) * | 2020-05-29 | 2020-08-28 | 东北大学 | Method for removing iron from bauxite by suspension roasting dehydration dry method |
| CN112474715B (en) * | 2020-11-05 | 2022-04-08 | 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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