CN104437858B - A kind of dephosphorization method of high phosphorus magnetic iron ore - Google Patents
A kind of dephosphorization method of high phosphorus magnetic iron ore Download PDFInfo
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- CN104437858B CN104437858B CN201410677812.XA CN201410677812A CN104437858B CN 104437858 B CN104437858 B CN 104437858B CN 201410677812 A CN201410677812 A CN 201410677812A CN 104437858 B CN104437858 B CN 104437858B
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Abstract
The invention provides a kind of dephosphorization method of high phosphorus magnetic iron ore, comprise the following steps：High phosphorus magnetite ore is crushed；Ore after will be broken is ground；Ore and water are slurried, are preselected by magnetic separator, the mine tailing after pre-selection is scanned, and obtains concentrate；Concentrate after magnetic separation is added into ore mill grinding；Mineral are carried out into magnetic separation again, the mine tailing after magnetic separation is implemented to scan；Add water to be made into ore pulp in concentrate, ore pulp is poured into flotation device, regulation pH value to alkalescence adds flotation agent and dispersant to carry out reverse flotation；Regrind by the ore pulp after reverse flotation；Ore pulp after ore grinding is carried out into third time magnetic separation, final concentrate is obtained.The method can not only remove the harmful element phosphorus in iron ore, and use multistage ore grinding, improve grinding efficiency, reducing energy consumption；The harmful components such as Si, S can also be removed in the present invention simultaneously, so as to reach raising Iron grade, the effect of phosphorus content is reduced.
Description
Technical field
The invention discloses a kind of ore dressing dephosphorization method of high phosphorus magnetic iron ore, belong to technical field of beneficiation.
Background technology
Phosphorus is one of main harmful element in steel smelting procedure, has a strong impact on process for making and steel product quality.
Steel is set to be easy to fracture in cold working, change is revealed " cold brittleness ".And phosphorus is difficult to remove in sintering process, in smelting again
Meeting Restore All enters the pig iron.In directly being smelted with existing oxygen coverter, the presence of phosphorus makes the iron hard fragility of increase again, to steel
Amount, raw materials consumption, lining durability and converter producing rate are adversely affected.Therefore in the smelting process of steel, iron ore concentrate
The requirement of the content of middle phosphorus is very strict, and the country typically requires P≤0.2%.
Extremely close complicated, the phosphorous iron ore of the symbiosis between Phosphate minerals and iron mineral in iron ore, in ore
Part phosphorus be jelly dispersed in ore；Part phosphorus is present in the form of Independent Mineral, and is in that isomorph is deposited
It is in iron ore, the purpose of phosphorus in removing iron ore to be unable to reach with general mechanical beneficiation method.
At this stage with the development of steel and iron industry, limited rich ore and the iron ore deposit of easily choosing have been petered out, available
Iron ore deposit increasingly tend to poor, thin, miscellaneous, ore-dressing technique also progressively becomes into complication, mainly have acidleach, alkali soak, microorganism skill
Art, smelting etc., these methods have good dephosphorization effect for specific mineral, but corresponding there is also high cost, ring
The features such as border influence is big.
The content of the invention
The invention provides a kind of dephosphorization method of high phosphorus magnetic iron ore, the deficiency in background technology is solved, the method is not
The harmful element phosphorus in iron ore can be only removed, and uses multistage ore grinding, improve grinding efficiency, reducing energy consumption；Originally simultaneously
The harmful components such as Si, S can also be removed in invention, so as to reach raising Iron grade, the effect of phosphorus content is reduced.
Realize technical scheme that above-mentioned purpose of the present invention used for：
A kind of dephosphorization method of high phosphorus magnetic iron ore, comprises the following steps：
(1), crush：High phosphorus magnetite ore is crushed so that the ore particle diameter after broken is less than 0.6mm；
(2) a, stage grinding：Ore input ore mill after will be broken is ground 5~10min；
(3) a, magnetic separation：Ore and water after grinding is tuned into the slurries that mass concentration is 20%~50%, by magnetic
Machine is selected to be preselected, the mine tailing after pre-selection is scanned, and obtains concentrate；
(4), two-stage ore grinding：Concentrate after magnetic separation is added into ore mill grinding so that by the concentrate of 325 mesh standard sieves
Quality at least accounts for the 80% of total concentrate；
(5), secondary magnetic separation：Mineral after two-stage ore grinding are carried out into magnetic separation again according to step (3), the mine tailing after magnetic separation
Implementation is scanned；
(6), reverse flotation：It is 10% to add the water for having removed calcium and magnesium to be made into mass concentration in concentrate after secondary magnetic separation
~20% ore pulp, flotation device is poured into by ore pulp, and regulation pH value to alkalescence adds flotation agent and dispersant, carries out reverse flotation；
(7), three stage grinding：Ore mill is added to implement grinding again by the ore pulp after reverse flotation；
(8), three magnetic separation：Ore pulp after three stage grindings is carried out into third time magnetic separation, final concentrate is obtained, in final concentrate
Phosphorus content is less than 0.1%.
Magnetic separation number of times is 2~3 times in step (3).
Magnetic separation number of times is 3 times in step (5).
The dispersant added in step (6) is waterglass, and addition is 100~300g/t ore pulps.
The reverse flotation agent added in step (6) is that mass ratio is 1:1 tall oil and gasoline mixture, addition be 50~
200g/t ore pulps.
Using the NaOH solution regulation pH most 9~12 of mass concentration 10% in step (6).
Flotation number of times is 5 times in step (6).
Lapping mode is ball milling in step (7).
Magnetic separation number of times is 2 times in step (8).
Compared with prior art, the dephosphorization method of the high phosphorus magnetic iron ore that the present invention is provided has advantages below：In the present invention
Using the harmful element phosphorus in multistage mill ore magnetic selection and reverse flotation combined removal iron ore.Multistage ore grinding, improves grinding efficiency,
Reducing energy consumption；The harmful components such as iron ore, reverse flotation removal P, Si, S are extracted in magnetic separation, so as to reach raising Iron grade, are reduced phosphorus and are contained
The effect of amount.
Specific embodiment
Detailed specific description is done to the present invention with reference to specific embodiment, but protection scope of the present invention not office
It is limited to following examples.
Embodiment 1
Raw Ore comes from Argentinian certain mine, mainly based on magnetic iron ore, Iron grade 49.30%, phosphorus in the present embodiment
Content 1.48%, belongs to high phosphorus magnetic iron ore.
Raw ore is crushed first so that all ores cross 28 mesh standard sieves, i.e., all particle sizes are less than 0.6mm.
Input ball mill pre-grinding 5min, added water the ore pulp for being tuned into that mass concentration is 40%, and 3 pre-selections, 3 times are carried out continuously using magnetic separator
Scanned again after mine tailing mixing after magnetic separation.All concentrate mixing by magnetic separation and after scanning enters ball mill and is ground again
Ore deposit so that by 325 target minreal mass ratioes up to more than 85%, then add water and be tuned into 25% slurries, continuously implements 3 magnetic separation, 3
Mine tailing after secondary magnetic separation carries out once purging selection again, the concentrate mixing of concentrate and magnetic separation after scanning.Concentrate after magnetic separation is entered floating
Machine is selected, addition has removed the water of calcium ion and magnesium ion, and regulation pulp density is 15%, opens mixer, and use quality concentration is
The pH value of 10% NaOH regulation ore pulps is 11, according to the ratio of ore pulp 250g per ton to addition waterglass in ore pulp as dispersion
Agent, uniform stirring 3min, it is 1 to continue to volume ratio is added in ore pulp:1 tall oil and gasoline mixture as reverse flotation agent,
Addition is 200ml/t ore pulps, and bubbling is carried out to air is passed through in solution, scrapes and defoams, and reverse flotation agent is added according to the step,
Stirring, bubbling is scraped to defoam and repeats 5 reverse flotations.By the ore pulp after reverse flotation all by ball mill, ore grinding 10min
Carry out 2 magnetic separation again afterwards, the concentrate after magnetic separation and the concentrate scanned are mixed finally smart by the mine tailing after magnetic separation by scanning
Ore deposit.
Concentrate analysis result：Iron content：68.79%, phosphorus content：0.098%, iron recovery：86.36%.
Embodiment 2
Raw Ore comes from Peru mine in the present embodiment, mainly based on magnetic iron ore, Iron grade 53.24%, and phosphorus contains
Amount 1.13%.
Raw ore is carried out first be crushed to below particle diameter 0.6mm.Input ball mill pre-grinding 3min, adds water and is tuned into mass concentration
It is 25% ore pulp, 2 pre-selections is carried out continuously using magnetic separator, is scanned again after the mine tailing mixing after 2 magnetic separation.By magnetic separation
Enter ball mill again and carry out ore grinding with all concentrate mixing after scanning so that by the mass ratio of 325 target minreals up to 80%
More than, then add water the slurries for being tuned into that mass concentration is 20%, continuously implements 3 magnetic separation, and the mine tailing after 3 magnetic separation carries out one again
It is secondary to scan, the concentrate mixing of concentrate and magnetic separation after scanning.Concentrate after magnetic separation is entered into flotation device, addition has removed calcium ion and magnesium
Ion water regulation pulp density be 15%, open mixer, use quality concentration be 10% NaOH solution adjustment pH value be
10.5, according to the ratio of ore pulp 175g per ton to addition waterglass in ore pulp as dispersant, uniform stirring 5min, according still further to every
It is 1 that the amount of ton ore pulp 150ml continues to volume ratio is added in ore pulp:1 tall oil and gasoline mixture as reverse flotation agent,
After even stirring 3min, bubbling is carried out to air is passed through in solution, scrape and defoam, reverse flotation agent, stirring, drum are added according to the step
Bubble, scrapes to defoam and repeats 5 reverse flotations.By the ore pulp after reverse flotation all by ball mill, enter again after ore grinding 10min
Concentrate after magnetic separation and the concentrate scanned are mixed to obtain final concentrate by 2 magnetic separation of row, the mine tailing after magnetic separation by scanning.
Concentrate analysis result：Iron content：67.82, phosphorus content：0.088, iron recovery：88.20%.
Claims (9)
1. a kind of dephosphorization method of high phosphorus magnetic iron ore, it is characterised in that comprise the following steps：
(1), crush：High phosphorus magnetite ore is crushed so that the ore particle diameter after broken is less than 0.6mm；
(2) a, stage grinding：Ore input ore mill after will be broken is ground 5~10min；
(3) a, magnetic separation：Ore and water after grinding is tuned into the slurries that mass concentration is 20%~50%, by magnetic separator
Preselected, the mine tailing after pre-selection is scanned, and obtains concentrate；
(4), two-stage ore grinding：Concentrate after magnetic separation is added into ore mill grinding so that by the concentrate quality of 325 mesh standard sieves
At least account for the 80% of total concentrate；
(5), secondary magnetic separation：Mineral after two-stage ore grinding are carried out into magnetic separation again according to step (3), the mine tailing after magnetic separation is implemented
Scan；
(6), reverse flotation：Added in concentrate after secondary magnetic separation the water for having removed calcium and magnesium be made into mass concentration for 10%~
20% ore pulp, flotation device is poured into by ore pulp, and regulation pH value to alkalescence adds flotation agent and dispersant, carries out reverse flotation；
(7), three stage grinding：Ore mill is added to implement grinding again by the ore pulp after reverse flotation；
(8), three magnetic separation：Ore pulp after three stage grindings is carried out into third time magnetic separation, final concentrate is obtained, phosphorus contains in final concentrate
Amount is less than 0.1%.
2. the dephosphorization method of high phosphorus magnetic iron ore according to claim 1, it is characterised in that：Magnetic separation number of times is 2 in step (3)
~3 times.
3. the dephosphorization method of high phosphorus magnetic iron ore according to claim 1, it is characterised in that：Magnetic separation number of times is 3 in step (5)
It is secondary.
4. the dephosphorization method of high phosphorus magnetic iron ore according to claim 1, it is characterised in that：The dispersion added in step (6)
Agent is waterglass, and addition is 100~300g/t ore pulps.
5. the dephosphorization method of high phosphorus magnetic iron ore according to claim 1, it is characterised in that：What is added in step (6) is anti-floating
It is that mass ratio is 1 to select agent:1 tall oil and gasoline mixture, addition are 50~200g/t ore pulps.
6. the dephosphorization method of high phosphorus magnetic iron ore according to claim 1, it is characterised in that：It is dense using quality in step (6)
The NaOH solution regulation pH most 9~12 of degree 10%.
7. the dephosphorization method of high phosphorus magnetic iron ore according to claim 1, it is characterised in that：Flotation number of times is 5 in step (6)
It is secondary.
8. the dephosphorization method of high phosphorus magnetic iron ore according to claim 1, it is characterised in that：Lapping mode is in step (7)
Ball milling.
9. the dephosphorization method of high phosphorus magnetic iron ore according to claim 1, it is characterised in that：Magnetic separation number of times is 2 in step (8)
It is secondary.
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| CN106179731B (en) * | 2016-07-19 | 2017-10-20 | 中化化肥有限公司成都研发中心 | The method of sesquichloride and magnesium in the single reverse flotation coupling abjection phosphorus ore of high-gradient magnetic separation |
| CN108384945A (en) * | 2018-03-05 | 2018-08-10 | 北京矿冶科技集团有限公司 | A method of alkali containing fosfosiderite soaks dephosphorization |
| CN109967223B (en) * | 2019-03-29 | 2020-12-25 | 中冶北方（大连）工程技术有限公司 | Impurity-reducing phosphorus-selecting process for apatite ore |
| CN114054204A (en) * | 2021-11-15 | 2022-02-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving quality, reducing titanium and reducing sulfur of Panxi ilmenite concentrate |
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| CN1030535A (en) * | 1983-08-19 | 1989-01-25 | 资源技术联合公司 | Reclaim phosphatic selection flocculence |
| RU2383392C2 (en) * | 2008-02-11 | 2010-03-10 | Научно-Производственная Фирма "Продэкология" | Method for enrichment of hematite ores |
| CN101693222A (en) * | 2009-11-02 | 2010-04-14 | 贵州大学 | Method for separating oolitic hematite |
| CN102553701A (en) * | 2012-02-28 | 2012-07-11 | 周建国 | Method for producing high-quality titanium concentrates from phosphorated ilmenite by dephosphorization floatation |
| CN102974446B (en) * | 2012-12-11 | 2015-04-01 | 中国地质科学院矿产综合利用研究所 | Oolitic hematite dressing method |
| CN103223378B (en) * | 2013-04-18 | 2014-07-09 | 广州有色金属研究院 | Beneficiation method for hydrothermal alteration bistagite-type platinum ore |
| CN103341400A (en) * | 2013-07-02 | 2013-10-09 | 广西大学 | Beneficiation method for reducing superfine grinding quantity of micro-fine particle magnetite |
| CN103586138A (en) * | 2013-11-12 | 2014-02-19 | 中钢集团马鞍山矿山研究院有限公司 | Phosphor decrease and iron extraction technology of high phosphorus magnetic iron ore |
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