CN101767057B - Method for separating aluminum and iron in high-iron bauxite - Google Patents
Method for separating aluminum and iron in high-iron bauxite Download PDFInfo
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- CN101767057B CN101767057B CN2008101908028A CN200810190802A CN101767057B CN 101767057 B CN101767057 B CN 101767057B CN 2008101908028 A CN2008101908028 A CN 2008101908028A CN 200810190802 A CN200810190802 A CN 200810190802A CN 101767057 B CN101767057 B CN 101767057B
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Abstract
The invention discloses a method for separating aluminum and iron in high-iron bauxite, which comprises the following steps: (1) crushing high-iron bauxite; (2) carrying out magnetization roasting on the crushed high-iron bauxite; (3) grinding ore; (4) separating the bauxite from the iron mineral through low-intensity magnetic separation to respectively obtain the bauxite and the iron mineral. Before the high-iron bauxite is dissolved out, the method adopts the magnetizing roasting-magnetic separation process to separate the iron from the bauxite containing high iron through the magnetizing roasting-magnetic separation process, and the bauxite after the magnetic separation is subjected to strong magnetic separation for removing the iron to obtain the qualified bauxite concentrate, so that the high-iron bauxite is well utilized, the bauxite and the iron mineral in the bauxite can be comprehensively utilized, and the method has the advantages of simple process, low cost, high yield, good product quality, safety, environmental protection and the like.
Description
Technical field
The present invention relates to a kind of separation method of mineral, relate in particular to a kind of method that aluminium in the high-iron bauxite is separated with iron phase, belong to the screening and the separation technology field of mineral.
Background technology
China's high-iron bauxite reserves are very abundant; Mainly be distributed in provinces such as Henan, Guangxi, Shanxi; High ferro trihydrate aluminum stone type bauxite prospective reserves can reach more than 1,000,000,000 tons, and the high iron diaspore bauxite reserves are also very abundant, and only the Shanxi county just has more than 100,000,000 tons.Because iron oxide content more than 10%, can't directly be produced aluminium oxide with sintering process, Bayer process or combination method.Separate the resource that to utilize these " dull " so must carry out ferro-aluminum earlier.Iron in China's high-iron bauxite mainly exists with the form of bloodstone and goethite; The magnetic that these two kinds of mineral have very a little less than; And the embedding cloth of iron mineral and bauxite relation is very tight in high-iron bauxite, and crystallization is very thin, can't carry out conventional magnetic separation or flotation and separate.At present, the iron and the aluminium that adopt several different methods to separate in the bauxite are both at home and abroad obtained certain achievement, but all fail to obtain aborning large-scale application.At present, do not see pair high-iron bauxite magnetizing roast is arranged-magnetic separation separation ferro-aluminum comprehensive utilization method.
Summary of the invention
The objective of the invention is the deficiency to prior art, what proposed a kind of technical feasibility, economical rationality, can effectively separate aluminium and the iron in the high-iron bauxite and can fully utilize wherein aluminium oxide and iron oxide utilizes high-iron bauxite production method of alumina.
Above-mentioned purpose of the present invention realizes by the following technical programs:
A kind of method that aluminium in the high-iron bauxite is separated with iron phase may further comprise the steps:
(1) broken high-iron bauxite; (2) high-iron bauxite after the fragmentation carries out magnetizing roast; (3) ore grinding; (4) through low intensity magnetic separation bauxite and iron mineral are separated, obtain bauxite and iron mineral respectively;
Wherein, the fragmentation described in the step (1) is preferably high-iron bauxite is crushed to whole particle diameters less than 5mm.
Described magnetizing roast is preferably carried out under following condition: add the 8%-50% that amount of coke is the mineral gross weight (more preferably 25%) during roasting; Sintering temperature is 900 ℃-1150 ℃ (more preferably 1030 ℃), and roasting time is 1.5-6 hour (more preferably 4.5 hours).Explain: so-called magnetizing roast is meant that mainly the iron mineral that do not have magnetic or weak magnetic becomes ferromagnetic magnetic iron ore or metallic iron through reduction, adds the carbon main purpose among the present invention and is used for the reduced iron mineral.
Described ore grinding is that the high-iron bauxite after the magnetizing roast is milled to fineness for account for the 60%-100% of gross weight less than 200 purpose ore content, and is preferred, accounts for 90% of gross weight less than 200 purpose ore content;
Described low intensity magnetic separation is under magnetic field intensity is the magnetic field intensity of 110 kilo-ampere/rice～160 kilo-ampere/rice, to carry out magnetic separation; Preferred, described low intensity magnetic separation is under magnetic field intensity is the magnetic field intensity of 127.4 kilo-ampere/rice, to carry out magnetic separation.
The total content that aluminium oxide in the described high-iron bauxite adds iron oxide preferably reaches more than 60%; Aluminium oxide wherein can be diaspore, gibbsite, boehmite and mixed ore thereof.
In the said method,, can also finally obtain the bauxite of full lattice with the bauxite that obtains that is separated again through the high intensity magnetic separation deironing in order to reach better effect; Wherein, the magnetic field intensity of described high intensity magnetic separation is preferably 550 kilo-ampere/rice-1100 kilo-ampere/rice, more preferably 717 kilo-ampere/rice; The bauxite of low intensity magnetic separation gained is carried out one section high intensity magnetic separation again, can reduce the iron content in the bauxite greatly.
In the said method, also can with to separate the iron mineral that obtains be that (140mm more preferably) obtains qualified iron ore concentrate again through 1-3 magnetic separation under the 80mm-160mm condition at yoke distance preferably through the magnetic field screening machine; Adopt the magnetic field screening machine to carry out selectedly can improving concentrate grade greatly, made that most iron oxide transforms metallic iron in the high-iron bauxite because sintering temperature is higher, so the full iron grade of final concentrate can reach more than 80%.
The embedding cloth of iron mineral and bauxite relation is very tight in China's high-iron bauxite; Crystallization is very thin, the magnetic of iron mineral very a little less than, magnetizing roast not only can make the weak magnetism mineral be converted into ferromagnetic iron mineral Huo and metallic iron; The crystallization of iron mineral is increased, help magnetic separation and separate.The inventive method is before the high-iron bauxite stripping; Adopt technical feasibility, the magnetizing roast-magnetic separation process of economical rationality makes the bauxite that contains high ferro select iron wherein through magnetizing roast-magnetic separation process; So bauxite after the magnetic separation obtains qualified alum clay after through the high intensity magnetic separation deironing concentrate; Make high-iron bauxite obtain good use, and can fully utilize wherein bauxite and iron mineral, have advantages such as technology is simple and direct, cost is low, productive rate is high, good product quality, safety and environmental protection.
Description of drawings
The process flow diagram of Fig. 1 the inventive method.
The specific embodiment
Further describe the present invention below in conjunction with specific embodiment, advantage of the present invention and characteristics will be more clear along with description.But these embodiment only are exemplary, scope of the present invention are not constituted any restriction.It will be understood by those skilled in the art that and down can make amendment with form or replace without departing from the spirit and scope of the present invention, but these modifications and replacing all fall within the scope of protection of the present invention the details of technical scheme of the present invention.
Embodiment 1
Certain economizes high-iron bauxite: Al China
2O
3Content 49.76%, SiO
2Content 4.9%, A/S=10.16, Fe
2O
3Content 28.23%;
Whole particle diameters that this high-iron bauxite is crushed to ore carry out magnetizing roast after less than 5mm, and the condition of magnetizing roast is: the weight that adds coke is to account for 25% of gross weight, and sintering temperature is 1030 ℃, roasting time 4.5 hours; High-iron bauxite after the magnetizing roast accounts for 90% of its gross weight through ore grinding to ore particle diameter less than 200 purpose weight; The magnetic field intensity of one stages of magnetic separation is 127.4 kilo-ampere/rice, isolates bauxite and iron mineral; Separate and carry out high intensity magnetic separation under the high intensity magnetic separation condition that the bauxite that obtains is 717 kilo-ampere/rice in magnetic field intensity, thoroughly iron mineral is selected, obtain qualified bauxite; Is 140mm condition under selected through the magnetic field screening machine at yoke distance with the iron ore concentrate that is separated, and obtains qualified iron ore concentrate.
Obtain Al
2O
3Content is 60.28%, Fe
2O
3Content is 6.89% bauxite, and the alumina recovery rate is 77.85%, and productive rate is 65.24%; Obtain Al
2O
3Content 4.31%, the iron mineral of full Fe content 85.26%, the iron oxide rate of recovery 42.56%, productive rate 11.87%; Obtain Al
2O
3Content is 23.78%, Fe
2O
3Content is 40.28% high ferro high aluminum mineral, and productive rate is 22.89%.
Embodiment 2
Certain economizes high-iron bauxite: Al China
2O
3Content 51.06%, SiO
2Content 4.15%, A/S=12.30, Fe
2O
3Content 29.01%;
Whole particle diameters that this high-iron bauxite is crushed to ore carry out magnetizing roast after less than 5mm, and it is 25% that the condition of magnetizing roast adds amount of coke, 1030 ℃ of sintering temperatures, roasting time 4.5 hours; High-iron bauxite after the magnetizing roast accounts for 90% of its gross weight through ore grinding to ore particle diameter less than 200 purpose weight; The magnetic field intensity of one stages of magnetic separation is 160 kilo-ampere/rice, isolates bauxite and iron mineral; Separate and carry out high intensity magnetic separation under the high intensity magnetic separation condition that the bauxite that obtains is 1095 kilo-ampere/rice in magnetic field intensity, the iron mineral with remnants selects once more, obtains qualified bauxite; Is 160mm condition under selected through the magnetic field screening machine at yoke distance with the iron ore concentrate that is separated, and obtains qualified iron ore concentrate.
Obtain Al
2O
3Content is 61.76%, Fe
2O
3Content is 6.96% bauxite, alumina recovery rate 76.95%, productive rate 64.82%; Obtain Al
2O
3Content 5.23%, the iron mineral of full Fe content 85.85%, the iron oxide rate of recovery 43.20%, productive rate 11.96%; Obtain Al
2O
3Content 24.53%, Fe
2O
3The high ferro high aluminum mineral of content 41.65%, productive rate 23.22%.
The comparative example 1
Certain economizes high-iron bauxite: Al China
2O
3Content 49.76%, SiO
2Content 4.9%, A/S=10.16, Fe
2O
3Content 28.23%;
Whole particle diameters that this high-iron bauxite is crushed to ore carry out magnetizing roast after less than 5mm, and the condition of magnetizing roast is 25% for adding amount of coke, 780 ℃ of sintering temperatures, roasting time 4.5 hours; High-iron bauxite after the magnetizing roast accounts for 90% of its gross weight through ore grinding to ore particle diameter less than 200 purpose weight; The magnetic field intensity of one stages of magnetic separation is 127.4 kilo-ampere/rice, isolates bauxite and iron mineral; Separate and carry out high intensity magnetic separation under the high intensity magnetic separation condition that the bauxite that obtains is 717 kilo-ampere/rice in magnetic field intensity, the iron mineral with remnants selects once more, obtains bauxite; Is 140mm condition under selected through the magnetic field screening machine at yoke distance with the iron ore concentrate that is separated, and obtains iron ore concentrate.
Obtain Al
2O
3Content is 60.28%, Fe
2O
3Content is 14.25% bauxite, alumina recovery rate 70.26%, and productive rate 59.53%, iron content still exceeds standard in this bauxite; Obtain Al
2O
3Content 12.68%, the iron mineral of full Fe content 56.35%, the iron oxide rate of recovery 42.89%, productive rate 15.26%, iron content is not high in this iron mineral, and alumina content also exceeds standard; Obtain Al
2O
3Content 48.21%, Fe
2O
3The high ferro high aluminum mineral of content 30.45%, productive rate 25.21%.
The comparative example 2
Certain economizes high-iron bauxite: Al China
2O
3Content 51.06%, SiO
2Content 4.15%, A/S=12.30, Fe
2O
3Content 29.01%;
Whole particle diameters that this high-iron bauxite is crushed to ore carry out magnetizing roast after less than 5mm, and the condition of magnetizing roast is 25% for adding amount of coke, 1030 ℃ of sintering temperatures, roasting time 1 hour.Magnetizing roast is after ore grinding to ore particle diameter accounts for 90% of its gross weight less than 200 purpose weight; The magnetic field intensity of one stages of magnetic separation is 127.4 kilo-ampere/rice, isolates bauxite and iron mineral; Separate under the condition of high intensity magnetic separation that the bauxite that obtains is 717 kilo-ampere/rice in magnetic field intensity and carry out high intensity magnetic separation, obtain bauxite; Final iron ore concentrate is selected under the 140mm condition through the magnetic field screening machine at yoke distance, obtains iron ore concentrate.
Obtain Al
2O
3Content 57.86%, Fe
2O
3The bauxite of content 15.86%, alumina recovery rate 68.36%, productive rate 58.24%, this bauxite iron content still exceeds standard; Obtain Al
2O
3Content 14.12%, the iron mineral of full Fe content 57.25%, the iron oxide rate of recovery 43.82%, productive rate 12.13%, iron content is not high in this iron mineral, and alumina content also exceeds standard; Obtain Al
2O
3Content 49.24%, Fe
2O
3The high ferro high aluminum mineral of content 39.89%, productive rate are 29.63%.
Claims (9)
1. method that aluminium in the high-iron bauxite is separated with iron phase may further comprise the steps:
(1) broken high-iron bauxite; (2) high-iron bauxite after the fragmentation carries out magnetizing roast; (3) ore grinding; (4) through low intensity magnetic separation bauxite and iron mineral are separated, obtain bauxite and iron mineral respectively, described magnetizing roast is carried out under following condition: add the 8%-50% that amount of coke is the mineral gross weight during roasting; Sintering temperature is 900 ℃-1150 ℃; Roasting time is 1.5-6 hour; Described low intensity magnetic separation is under magnetic field intensity is the magnetic field intensity of 110 kilo-ampere/rice～160 kilo-ampere/rice, to carry out magnetic separation; Be under the condition of 550 kilo-ampere/rice-1100 kilo-ampere/rice through the high intensity magnetic separation deironing with the bauxite that obtains that is separated in magnetic field intensity; With separate the iron mineral that obtains through the magnetic field screening machine yoke distance be under the 80mm-160mm condition again through 1-3 magnetic separation, obtain qualified iron ore concentrate.
2. according to the described method of claim 1, it is characterized in that: being broken for described in the step (1) is crushed to whole particle diameters less than 5mm with high-iron bauxite.
3. according to the described method of claim 1, it is characterized in that: described magnetizing roast is carried out under following condition: adding amount of coke during roasting is 25% of mineral gross weight, and sintering temperature is 1030 ℃, and roasting time is 4.5 hours.
4. according to the described method of claim 1, it is characterized in that: described ore grinding is that the high-iron bauxite after the magnetizing roast is milled to fineness for account for the 60%-100% of gross weight less than 200 purpose ore content.
5. according to the described method of claim 4, it is characterized in that: described ore grinding is that the high-iron bauxite after the magnetizing roast is milled to fineness for to account for 90% of gross weight less than 200 purpose ore content.
6. according to the described method of claim 1, it is characterized in that: described low intensity magnetic separation is under magnetic field intensity is the magnetic field intensity of 127.4 kilo-ampere/rice, to carry out magnetic separation.
7. according to the described method of claim 1, it is characterized in that: the total content that the aluminium oxide in the described high-iron bauxite adds iron oxide reaches more than 60%; Wherein aluminium oxide is diaspore, gibbsite, boehmite or their mixed ore.
8. according to the described method of claim 1, it is characterized in that: be with the bauxite that obtains that is separated under the condition of 717 kilo-ampere/rice through the high intensity magnetic separation deironing in magnetic field intensity.
9. according to the described method of claim 1, it is characterized in that: with separate the iron mineral that obtains through the magnetic field screening machine yoke distance be under the 140mm condition again through 1-3 magnetic separation, obtain qualified iron ore concentrate.
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| CN101767057B true CN101767057B (en) | 2012-04-25 |
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| CN102925665A (en) * | 2011-08-11 | 2013-02-13 | 张祥麟 | Ore separation method for industrial production of above 65 iron concentrate powder through cluster analysis of low-grade hematite |
| CN103614547B (en) * | 2013-11-28 | 2014-12-17 | 中南大学 | Method for separating iron, aluminum and silicon from diasporic bauxite |
| CN103752403B (en) * | 2014-01-10 | 2016-01-20 | 中钢集团马鞍山矿山研究院有限公司 | A kind of beneficiation method being suitable for high alumina, high mud, high-grade Complex iron ore |
| CN104163445A (en) * | 2014-07-25 | 2014-11-26 | 中国铝业股份有限公司 | Bauxite comprehensive utilization method |
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| CN110369124A (en) * | 2019-08-28 | 2019-10-25 | 山西惟泰安全环保工程技术有限公司 | A kind of deironing apparatus that refractory material is novel and technique |
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2008
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