CN101768662A - Utilization method of sulfur-containing magnetite - Google Patents
Utilization method of sulfur-containing magnetite Download PDFInfo
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- CN101768662A CN101768662A CN200810072534A CN200810072534A CN101768662A CN 101768662 A CN101768662 A CN 101768662A CN 200810072534 A CN200810072534 A CN 200810072534A CN 200810072534 A CN200810072534 A CN 200810072534A CN 101768662 A CN101768662 A CN 101768662A
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Abstract
The invention relates to the filed of mineral processing, in particular to a utilization method of sulfur-containing magnetite which comprises the following steps: (1) carrying out magnetic separation on the sulfur-containing magnetite to obtain magnetic rough concentration, floating magnetic tailing to obtain sulphur-iron concentrate; (2) proportioning the magnetic rough concentration and the sulphur-iron concentrate, wherein the sulphur grade of mixed ore sample after proportion is not less than 35%; (3) carrying out oxidizing roast on the mixed ore sample to obtain oxidizing roasting slag and flue gas sulfur dioxide, and preparing the flue gas sulfur dioxide into sulphuric acid; and (4) leaching the oxidizing roasting slag by hot sulfuric acid solution to remove harmful elements such as copper, zinc and the like to obtain iron concentrate. Compared with the prior art, the invention is reasonable in economy and feasible in technology, solves the problem of difficult utilization of the sulfur-containing magnetite, can generate good economical benefit and has high promotional value.
Description
Technical field
The present invention relates to the mineral manufacture field, be meant a kind of method of utilizing of sulfur-containing magnetite especially.
Background technology
Magnetite is a kind of important raw and processed materials of iron and steel enterprise's steel-making, but the content of the harmful element sulphur in the magnetite is had strict requirement, because sulphur is the most deleterious element in the steel, makes steel produce " red brittleness ", reduces the toughness and the plasticity of steel.In short supply day by day along with iron ore deposit, the resource of magnetite of utilizing those sulfur-bearings to exceed standard just becomes more and more meaningful.
The sulfur mineral that contains in the magnetite has many kinds, contains sulfur mineral at difference, can adopt different process for sulfur removal.The main sulfur mineral that contains has:
Pyrite, pyrrhotite, chalcopyrite and zink sulphide etc.Mainly contain the sulfur mineral difference, the treatment process of employing is also different.
Main treatment process has at present: magnetic method, flotation process, magnetic separation-flotation process, flotation-magnetic method and inverse flotation method etc.
These some character that contain sulfur mineral are as follows:
Pyrite: industrial smelting vitriolic main raw material is the widest sulfide that distributes in the earth's crust, hardness 6～6.5, relative density 4.9～5.2.
Pyrrhotite: industrially be mainly used to prepare sulfuric acid, hardness 3.5～4.5, relative density 4.60～4.70 has magnetic.Pyrrhotite very easily produces the argillization phenomenon when ore grinding, and also very easily oxidized in weakly acidic solution.These characteristics make removing of pyrrhotite become very difficult just.Often will take multiple means could realize separating of pyrrhotite and magnetite, and therefore production cost also can raise, cost economically is bigger.
Do an introduction with regard to these process for sulfur removal commonly used below:
Magnetic method
This method is fit to magnetic mineral is separated with non magnetic ore, and magnetite is a strongly magnetic mineral, and pyrite, chalcopyrite and zink sulphide are non magnetic ores, can realize that with this method magnetite separates with it.But pyrrhotite also is magnetic mineral, and this method can't be separated magnetite and pyrrhotite.
Flotation process
This method is present most widely used a kind of process for sulfur removal, have with low cost, the advantage that flotation effect is good.If the sulfur mineral that mainly contains in the magnetite is a pyrite, it is very effective adopting this kind flotation sulphur removal method.Pyrite is easy to realize flotation with xanthate and pine camphor oil under weak acid environment, through flotation separation repeatedly, the pyrite in the magnetite can be removed substantially.Can satisfy the requirement of steel industry fully through the product magnetite concentrate after the flotation sulphur removal.
But if contain sulfur mineral is pyrrhotite, because pyrrhotite very easily produces the argillization phenomenon when ore grinding, and it is also very easily oxidized in weakly acidic solution, magnetite and oblique system pyrrhotite are strongly magnetic mineral, except the two itself is easy to produce the homophase magnetic coagulation, also produce the out-phase magnetic coagulation between the two, so magnetite will cover the pyrrhotite surface, reduce its flotability by the remanent magnetism effect.Particularly when mineral granularity was thin, the magnetic cover cap was very serious.All these characteristics difficulty relatively that becomes in the time of will making from magnetite flotation separation pyrrhotite, at this moment need to take certain technique means, as add activator, increase the flotation hop count, add combination medicament and select means such as rational medicament interpolation to carry out the flotation separation of pyrrhotite.Do that like this production cost is raise, infrastructure investment increases, and cost economically is bigger.
Magnetic separation-flotation process
Single beneficiation method has certain limitation, multiple beneficiation method to be combined in the actual production process often be adopted, magnetic separation-flotation process is exactly wherein a kind of.
In ore dressing process, utilize the magnetic and the flotability of mineral simultaneously.Adopt this method, during by emersion, can prevent that magnetic mineral is sent to froth product at non magnetic ore.The major requirement of this method is, the mineral that need be separated from each other, and its magnetic and flotability must be inequality.When flotation process is used for iron ore, generally adopt reverse flotation, promptly gangue (being mainly silica) and impure mineral be by emersion, and valuable mineral (magnetite) is recovered in the mine tailing.
To carry out magnetic concentration working through magnetic plant through the ore pulp behind the ore grinding, it can be repeatedly magnetic separation, obtain the magnetic rough concentrate after the magnetic separation, tend to contain more impure mineral (pyrite, pyrrhotite and a certain amount of gangue mineral etc.) in this part magnetic rough concentrate, then product magnetic rough concentrate is carried out the reverse flotation sulphur removal operation of multistage, finally obtain the product magnetite concentrate.
When containing pyrrhotite, pyrite, chalcopyrite and zink sulphide etc. in the magnetite and contain sulfur mineral, this method just relatively effectively.After the magnetic separation of mineral process, pyrite, chalcopyrite and zink sulphide etc. contain the most meetings of sulfur mineral and are thrown in mine tailing, and pyrrhotite is because this kind mineral have magnetic, meeting and magnetite are selected in the magnetic rough concentrate together, thereby become the topmost sulfur mineral that contains, carry out reverse flotation sulphur removal operation then.
Flotation-magnetic method
Flotation-magnetic method is that flow process is once put upside down, and flotation is placed on flow process the place ahead, and magnetic concentration working is placed on last a kind of method for floating, and the ore character of handling with " magnetic separation-flotation process " is identical.But magnetic separation-flotation process and flotation-magnetic method have difference:
The ore that sulphur content is higher for magnetite content is lower, can adopt the method for first flotation, magnetic separation again to produce magnetite concentrate, do like this owing to there are a big chunk mineral to be flotated, required ore pulp amount to be processed greatly reduces when the magnetic concentration working of back, and is reasonable economically; And this kind ore is if adopt first magnetic separation, back flotation operation, and required ore pulp amount to be processed is big in the time of can making magnetic concentration working, and is unreasonable economically.
With regard to the higher relatively sulfur-containing magnetite of magnetite content, adopt first magnetic separation, back floatation process more better, promptly through magnetic concentration working a part of magnetite is wherein selected earlier, and then the flotation sulphur removal.
More than four kinds of methods are several common methods of utilizing sulfur-containing magnetite main at present, but these methods also have tangible weak point.
These weak points mainly contain:
1, the top method of narrating is difficult to contain sulfur mineral and removes more up hill and dale.Especially for the magnetite that contains pyrrhotite, all the more so.Because pyrrhotite very easily produces the argillization phenomenon when ore grinding, and it is also very easily oxidized in weakly acidic solution, magnetite and oblique system pyrrhotite are strongly magnetic mineral, except the two itself is easy to produce the homophase magnetic coagulation, also produce the out-phase magnetic coagulation between the two by the remanent magnetism effect, therefore magnetite will cover the pyrrhotite surface, reduce its flotability.Particularly when mineral granularity was thin, the magnetic cover cap was very serious.Pyrrhotite and the close adhesion of magnetite in addition, and magnetite in addition comprises the such situation of pyrrhotite fully and occurs, and these characteristics of pyrrhotite have just determined that removing the such sulfur mineral that contains of pyrrhotite with flotation process is the comparison difficulty.Contain sulfur mineral for other, as pyrite, chalcopyrite and zink sulphide etc., although these flotation that contain sulfur mineral also exist the adhesion relation of more complicated comparatively speaking than being easier between these mineral and magnetite and the pyrrhotite, it also is to be difficult to eliminate more up hill and dale that flotation is removed.
2, remove the sulfur mineral that contains in the magnetite with method for floating, flow process is often very complicated, and flotation reagent is also more, and the one-time investment of capital construction is big, and is unreasonable economically.
In addition, also have some patents of invention also to introduce some and utilize the method for sulfur-bearing iron ore concentrate.
Chinese patent 200510031090.1 is mentioned " a kind of desulfur method of iron ore ", is to be that energy substance is cultivated thiobacillus ferrooxidant and thiobacillus thiooxidans mixed bacterium with the sulphur powder in 1.8～2.5 the 9k iron-free substratum at pH; At pH is to be that energy substance adds to be desulfurization to be that the high-sulfur iron ore concentrate of main sulfide mineral carries out the adaptability domestication and cultivates with pyrrhotite, to obtain adaptability domestication desulfurization bacterium with the sulphur powder in 1.8～2.5 the 9k iron-free substratum; The high-sulfur iron ore concentrate is dipped in carries out the shaking table concussion in the water that contains adaptability domestication desulfurization bacterium liquid and leach desulfurization, obtain satisfactory low-sulfur iron ore concentrate through filtration, washing, drying again.
This invention is a kind of microbial metallurgy technology, has that cost is low, pollution is little, energy consumption is low, a high efficiency, characteristics such as easy and simple to handle, it is introduced that this invention can make the decreasing ratio of iron ore concentrate greater than 70%.
But this invention also has significant disadvantages: thiobacillus ferrooxidant and thiobacillus thiooxidans mixed bacterium are carried out desulfurization, and the time of reaction is longer, and production efficiency is low; Facility investment is big, and thiobacillus ferrooxidant and thiobacillus thiooxidans mixed bacterium are carried out the desulfurization meeting makes the production unit volume big, and number of containers increases, thereby the investment of capital construction is increased.
China Patent No. " 200410078294.6 " has proposed a kind of " process for extracting iron concentrate by sulfuric slag flotation ", this patent adopts the iron in ore grinding-control dispersion-floatation process method extraction sulfate slag, this patent is carried out selective milling with sulfate slag earlier in grinding machine, ore milling concentration is 20～80%; Ore milling product granularity-200 order that obtains accounts for 70～95%; Qualified ore milling product adds acidified sodium silicate 1～10kg/t and controls dispersion in steel basin, enter flotation machine again and add lipid acid or sulfonic acid collecting agent 0.1～5kg/t; Preserving floatation concentration is 10～50%; Add alcohols pore forming material 10～100g/t emersion iron ore concentrate at last, flotation 1～15 minute.Iron work is sent in the iron ore concentrate thickening, and the flotation tailings uses as cement additire.
This patent adopts is the problem of utilizing that the method for flotation iron ore concentrate solves the sulfur-bearing iron ore concentrate.But, in the floatation process, existing complicated adhesion relation between sulfur mineral and the iron ore concentrate owing to contain, these contain sulfur mineral and just inevitably understand some and be entrained in the concentrate in floatation process so, thereby the sulphur content in the concentrate may be exceeded standard.
Summary of the invention
Main purpose of the present invention is to overcome the difficult shortcoming of sulfur-containing magnetite utilization in the prior art, and a kind of method of utilizing of sulfur-containing magnetite is provided.
Sulfur-containing magnetite of the present invention, it contains sulfur mineral mainly is pyrite, also has pyrrhotite and a spot of chalcopyrite, zink sulphide etc. to contain sulfur mineral in addition.Magnetic concentration working is carried out in this ore deposit earlier, select magnet rough concentrate wherein; Sulfur-bearing mine tailing after the magnetic separation is carried out flotation, and flotation is undertaken by the flow process of " one roughing, selected several times ", and the product that obtains at last is the sulphur iron ore concentrate.Magnetite concentrate with sulfur-bearing mixes according to a certain percentage with the sulphur iron ore concentrate then, makes this mixed sulphur grade in two kinds of ore deposits can not be lower than 35%, when preparing sulfuric acid to satisfy pyrite burning to the requirement of the minimum sulphur content of raw material sulfurous iron ore.
In addition, resulting fired slags after the mixing ore deposit oxidizing roasting, just harmful element copper in the iron ore concentrate and zinc content can exceed standard, and we will leach in the certain density sulphuric acid soln by at certain extraction temperature, thereby remove this two kinds of harmful elements.
Pyrrhotite is to contain sulfur mineral, and simultaneously, this kind mineral also are used for preparing sulfuric acid industrial, and just because content is limited, its consumption does not have pyrite extensive like that.Therefore, in this kind method pyrrhotite for treating processes without any influence.Pyrrhotite all is magnetic mineral owing to it is the same with magnetite in magnetic concentration working, and pyrrhotite meeting and magnetite enter in the magnet rough concentrate together, become a kind of sulfur mineral that contains of magnet rough concentrate.Because it is oxidized that pyrrhotite is easy to, therefore, pyrrhotite can be very fast oxidized in roasting process, and its contained sulphur can enter into flue gas with the form of sulfurous gas.
Based on above-mentioned principle, the present invention adopts following technical scheme:
A kind of sulfur-containing magnetite utilize method, it is characterized in that comprising the steps: that (1) carry out magnetic separation with sulfur-containing magnetite and obtain the magnetic rough concentrate, the mine tailing flotation obtains the sulphur iron ore concentrate; (2) magnetic rough concentrate and sulphur iron ore concentrate are joined the ore deposit, join and mix sample ore sulphur grade behind the ore deposit and be not less than 35%; (3) will mix sample ore and carry out oxidizing roasting, obtain oxidizing roasting slag and SO 2 from fume, SO 2 from fume will be prepared sulfuric acid; (4) the oxidizing roasting slag adopts hot sulphuric acid soln to leach and removes harmful elements such as copper, zinc, obtains iron ore concentrate.
The sulphur content of described magnetic rough concentrate is not more than 20%.
The temperature of oxidizing roasting is 800～950 ℃ in the described step (3).
The time of oxidizing roasting is 4～6h in the described step (3).
Charging temperature in the described step (3) during oxidizing roasting is 200～300 ℃.
The sulphuric acid soln mass concentration is 10～30% in the described step (4), and extraction temperature is 80～95 ℃.
The method that obtains magnetic rough concentrate and sulphur iron ore concentrate in the described step (1) from sulfur-containing magnetite is as follows: at first sulfur-containing magnetite is obtained the magnetic rough concentrate after through a magnetic separation, the mine tailing after the magnetic separation obtains the sulphur iron ore concentrate through after the flotation.
Mine tailing in the described step (1) after the magnetic separation obtains in the process of sulphur iron ore concentrate through after the flotation, and this flotation is carried out according to one roughing and twice selected flow process at least.
By the above-mentioned description of this invention as can be known, compare with prior art, the major advantage of utilizing method of a kind of high sulfur-bearing sulfurous iron ore of the present invention is as follows:
1, flow process is simple, the magnetic rough concentrate that raw ore obtains through magnetic concentration working, directly carry out with the sulphur iron ore concentrate join the ore deposit operation, carry out roasting to mixing the ore deposit then, saved the flotation sulphur removal operation of magnet rough concentrate, simplified flowage structure widely;
2, less investment, reasonable economically, the flotation sulphur removal operation of magnetic rough concentrate is because the existence of pyrrhotite, can make that the flow process of flotation is elongated, infrastructure investment increases, and the medicament use is complicated, and these can make production cost raise, and the inventive method solves these problems well, and the product of producing also can satisfy the requirement of smelting iron and steel fully;
3, good in economic efficiency, resource can be utilized fully, this kind method not only makes the magnetite in the sulfur-containing magnetite obtain utilization, and these contain sulfur mineral, pyrite, pyrrhotite, chalcopyrite and zink sulphide all can be utilized, pyrite, pyrrhotite flue gas can prepare sulfuric acid, and fired slags is an iron ore concentrate; Copper and zinc can exist with the oxidizing roasting slag in, can be at a certain temperature, leach with certain density sulfuric acid and to remove; When reaching finite concentration, the copper content in the leach liquor can solve leach liquor so well and directly discharge the problem of environmental pollution that is brought with method of extraction recovery valuable metal copper wherein.
In a word, the present invention has simplified process structure, has shortened the production cycle, and the content of harmful element sulphur, copper and the zinc etc. of product iron concentrate is very low simultaneously, has satisfied the production requirement of iron and steel enterprise fully; The sulfurous gas of roasting is used for making sulfuric acid, and directly discharging had not both utilized resource, had protected environment again; This invention is reasonable economically, technical feasible, has solved the difficult problem of utilizing of sulfur-containing magnetite, can produce good economic benefit.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
Embodiment 1
Certain sulfur-containing magnetite obtains the magnetic rough concentrate after through a magnetic separation, and detecting the sulphur grade is 12.99%, and the iron grade is 58.66%; Mine tailing after the magnetic separation obtains the sulphur iron ore concentrate through after " one roughing, four times selected " operation, and the sulphur grade is 51.86%, and the iron grade is 45.93%.
Magnetic rough concentrate productive rate is low, itself and sulphur iron ore concentrate interruption are joined the ore deposit and are carried out roasting, the sulphur grade that guarantees again simultaneously to join behind the ore deposit is not less than 35%, therefore, is to mix at 4: 1 to obtain biased sample with sulphur iron ore concentrate and magnetic rough concentrate by mass ratio, the sulphur grade of biased sample is 44.09%, and the iron grade is 48.48%.Biased sample obtains fired slags through after the roasting, i.e. iron ore concentrate.
Roasting condition:
Give ore deposit 100g/ time; 250 ℃ of charging temperatures; 850 ℃ of maturing temperatures; Roasting time 5h;
The fired slags detected result is as follows:
Table 1 roasting iron ore concentrate multielement analysis
By the multielement analysis of table 1 as can be known, in the iron ore concentrate after the roasting, the content of iron, sulphur, aluminium, silicon and phosphorus can satisfy the requirement of industry to these constituent contents.But the content of copper and zinc is higher slightly.
Therefore, we consider to adopt at a certain temperature, and certain density sulphuric acid soln leaches copper removal and zinc.
Leaching condition is as follows:
90 ℃ of solution temperatures; Sulfuric acid concentration 20%; Extraction time is 2 hours; To stir simultaneously.Leach the end back leached mud is filtered, washing, dry then, the censorship analysis, analytical results is as shown in table 2:
Table 2 roasting iron ore concentrate acid leaching residue multielement analysis
As can be seen from Table 2, the content of copper and zinc can satisfy the requirement of industry to the two content fully after sulfuric acid leached.
Embodiment 2
Certain sulfur-containing magnetite obtains the magnetic rough concentrate after through a magnetic separation, and detecting the sulphur grade is 1.11%, and the iron grade is 65.31%, belongs to the low-sulfur magnetite, but still can't directly utilize, and the content of its sulphur is not higher than 0.5% requirement greater than what steel industry required.Mine tailing after the magnetic separation obtains the sulphur iron ore concentrate through behind the flotation operation, and the sulphur grade is 51.86%, and the iron grade is 45.93%.
Is to mix at 2: 1 to obtain biased sample with sulphur iron ore concentrate and magnetic rough concentrate by mass ratio, and the sulphur grade of biased sample is 35.12%, and the iron grade is 52.32%.Biased sample obtains fired slags through after the roasting, i.e. iron ore concentrate.
Roasting condition:
Give ore deposit 100g/ time; 250 ℃ of charging temperatures; 850 ℃ of maturing temperatures; Roasting time 5h;
Oxidizing roasting slag detected result is as follows:
Table 3 roasting iron ore concentrate multielement analysis
By the multielement analysis of table 1 as can be known, in the iron ore concentrate after the roasting, the content of iron, sulphur, aluminium, silicon and phosphorus can satisfy the requirement of industry to these constituent contents.
For copper zinc, we consider to adopt at a certain temperature, and certain density sulphuric acid soln leaches copper removal and zinc.
Leaching condition is as follows:
90 ℃ of solution temperatures; Sulfuric acid concentration 20%; Extraction time is 2 hours; To stir simultaneously.Leach the end back leached mud is filtered, washing, dry then, the censorship analysis, analytical results is as shown in table 4:
Table 4 roasting iron ore concentrate acid leaching residue multielement analysis
Embodiment 3
The Qinghai sulfur-containing magnetite obtains the magnetic rough concentrate through after the magnetic separation, and its multielement detected result is as follows:
Table 5 magnetic rough concentrate multielement analysis
Mine tailing after the magnetic separation obtains the sulphur iron ore concentrate through after " one roughing, four times selected " operation, and the sulphur grade is 51.86%, and the iron grade is 45.93%.
Is to mix at 9: 1 to obtain biased sample with sulphur iron ore concentrate and magnetic rough concentrate by mass ratio, and the sulphur grade of biased sample is 47.97%, and the iron grade is 47.40%.Biased sample obtains fired slags through after the roasting, i.e. iron ore concentrate.
Roasting condition:
Give ore deposit 100g/ time; 250 ℃ of charging temperatures; 850 ℃ of maturing temperatures; Roasting time 5h;
Oxidizing roasting slag detected result is as follows:
Table 6 oxidizing roasting slag multielement analysis
For copper zinc, therefore, we consider to adopt at a certain temperature, and certain density sulphuric acid soln leaches copper removal and zinc.
Leaching condition is as follows:
90 ℃ of solution temperatures; Sulfuric acid concentration 20%; Extraction time is 2 hours; To stir simultaneously.Leach the end back leached mud is filtered, washing, dry then, the censorship analysis.Analytical results is as follows:
Table 7 fired slags acidleach multielement analysis
Embodiment 4
Certain sulfur-containing magnetite obtains the magnetic rough concentrate after through a magnetic separation, and detecting the sulphur grade is 20.08%, and the iron grade is 60.01%, belongs to sulfur-containing magnetite, but still can't directly utilize.Mine tailing after the magnetic separation obtains the sulphur iron ore concentrate through behind the flotation operation, and the sulphur grade is 48.05%, and the iron grade is 43.00%.
Is to mix at 1.14: 1 to obtain biased sample with sulphur iron ore concentrate and magnetic rough concentrate by mass ratio, and the sulphur grade of biased sample is 35%, and the iron grade is 50.94%.Biased sample obtains fired slags through after the roasting, i.e. iron ore concentrate.
Roasting condition:
Give ore deposit 100g/ time; 200 ℃ of charging temperatures; 800 ℃ of maturing temperatures; Roasting time 4h;
Oxidizing roasting slag detected result is as follows:
Table 8 roasting iron ore concentrate multielement analysis
By the multielement analysis of table 8 as can be known, in the iron ore concentrate after the roasting, the content of iron, sulphur, aluminium, silicon and phosphorus can satisfy the requirement of industry to these constituent contents.
For copper zinc, we consider to adopt at a certain temperature, and certain density sulphuric acid soln leaches copper removal and zinc.
Leaching condition is as follows:
80 ℃ of solution temperatures; Sulfuric acid concentration 10%; Extraction time is 2 hours; To stir simultaneously.Leach the end back leached mud is filtered, washing, dry then, the censorship analysis, analytical results is as shown in table 9:
Table 9 roasting iron ore concentrate acid leaching residue multielement analysis
Embodiment 5
Certain sulfur-containing magnetite obtains the magnetic rough concentrate after through a magnetic separation, and detecting the sulphur grade is 5.00%, and the iron grade is 61.50%; Mine tailing after the magnetic separation obtains the sulphur iron ore concentrate through after " one roughing, four times selected " operation, and the sulphur grade is 50.10%, and the iron grade is 42.40%.
Magnetic rough concentrate productive rate is low, itself and sulphur iron ore concentrate interruption are joined the ore deposit and are carried out roasting, the sulphur grade that guarantees again simultaneously to join behind the ore deposit is not less than 35%, therefore, is to mix at 10: 1 to obtain biased sample with sulphur iron ore concentrate and magnetic rough concentrate by mass ratio, the sulphur grade of biased sample is 46.00%, and the iron grade is 44.14%.Biased sample obtains fired slags through after the roasting, i.e. iron ore concentrate.
Roasting condition:
Give ore deposit 100g/ time; 300 ℃ of charging temperatures; 950 ℃ of maturing temperatures; Roasting time 6h;
The fired slags detected result is as follows:
Table 10 roasting iron ore concentrate multielement analysis
By the multielement analysis of table 10 as can be known, in the iron ore concentrate after the roasting, the content of iron, sulphur, aluminium, silicon and phosphorus can satisfy the requirement of industry to these constituent contents.But the content of copper and zinc is higher slightly.
Therefore, we consider to adopt at a certain temperature, and certain density sulphuric acid soln leaches copper removal and zinc.
Leaching condition is as follows:
95 ℃ of solution temperatures; Sulfuric acid concentration 30%; Extraction time is 2 hours; To stir simultaneously.Leach the end back leached mud is filtered, washing, dry then, the censorship analysis, analytical results is as shown in table 11:
Table 11 roasting iron ore concentrate acid leaching residue multielement analysis
Above-mentioned only is several specific embodiment of the present invention, but design concept of the present invention is not limited thereto, and allly utilizes this design that the present invention is carried out the change of unsubstantiality, all should belong to the behavior of invading protection domain of the present invention.
Claims (8)
- A sulfur-containing magnetite utilize method, it is characterized in that comprising the steps: that (1) carry out magnetic separation with sulfur-containing magnetite and obtain the magnetic rough concentrate, the magnetic tailing flotation obtains the sulphur iron ore concentrate; (2) magnetic rough concentrate and sulphur iron ore concentrate are joined the ore deposit, join and mix sample ore sulphur grade behind the ore deposit and be not less than 35%; (3) will mix sample ore and carry out oxidizing roasting, obtain oxidizing roasting slag and SO 2 from fume, SO 2 from fume will be prepared sulfuric acid; (4) the oxidizing roasting slag adopts hot sulphuric acid soln to leach and removes harmful elements such as copper, zinc, obtains iron ore concentrate.
- A kind of sulfur-containing magnetite as claimed in claim 1 utilize method, it is characterized in that: the sulphur content of described magnetic rough concentrate is not more than 20%.
- A kind of sulfur-containing magnetite as claimed in claim 1 utilize method, it is characterized in that: the temperature of oxidizing roasting is 800～950 ℃ in the described step (3).
- 4. as the method for utilizing of claim 1 or 3 described a kind of sulfur-containing magnetites, it is characterized in that: the time of oxidizing roasting is 4～6h in the described step (3).
- 5. as the method for utilizing of claim 1 or 3 described a kind of sulfur-containing magnetites, it is characterized in that: the charging temperature in the described step (3) during oxidizing roasting is 200～300 ℃.
- A kind of sulfur-containing magnetite as claimed in claim 1 utilize method, it is characterized in that: the sulphuric acid soln mass concentration is 10～30% in the described step (4), and extraction temperature is 80～95 ℃.
- 7. a kind of sulfur-containing magnetite as claimed in claim 1 utilizes method, it is characterized in that: the method that obtains magnetic rough concentrate and sulphur iron ore concentrate in the described step (1) from sulfur-containing magnetite is as follows: at first sulfur-containing magnetite is obtained the magnetic rough concentrate after through a magnetic separation, the mine tailing after the magnetic separation obtains the sulphur iron ore concentrate through after the flotation.
- A kind of sulfur-containing magnetite as claimed in claim 7 utilize method, it is characterized in that: the mine tailing after the magnetic separation obtains in the process of sulphur iron ore concentrate through after the flotation, and this flotation is carried out according to one roughing and twice selected flow process at least.
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| CN105214837A (en) * | 2015-10-14 | 2016-01-06 | 广州有色金属研究院 | One is rich in magnetic iron ore and pyritous copper sulphur ore deposit beneficiation method |
| CN112458284A (en) * | 2019-09-06 | 2021-03-09 | 永仁共创锌业有限公司 | Method for recovering carbon, copper, iron and silver from zinc oxide slag |
| CN112708753A (en) * | 2020-12-29 | 2021-04-27 | 武钢资源集团大冶铁矿有限公司 | Deep desulfurization treatment method and system for iron ore concentrate |
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| CN105214837B (en) * | 2015-10-14 | 2017-06-20 | 广州有色金属研究院 | A kind of copper sulphur ore deposit beneficiation method rich in magnetic iron ore and pyrite |
| CN112458284A (en) * | 2019-09-06 | 2021-03-09 | 永仁共创锌业有限公司 | Method for recovering carbon, copper, iron and silver from zinc oxide slag |
| CN112708753A (en) * | 2020-12-29 | 2021-04-27 | 武钢资源集团大冶铁矿有限公司 | Deep desulfurization treatment method and system for iron ore concentrate |
| CN112897672A (en) * | 2021-01-25 | 2021-06-04 | 中南大学 | Solid vulcanizing agent, microetching copper-containing wastewater recycling treatment system and control method |
| CN113667820A (en) * | 2021-07-20 | 2021-11-19 | 包头钢铁（集团）有限责任公司 | Comprehensive and efficient utilization method of Mongolian iron ore |
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