CN102553717B - Beneficiation process for high-sulfur hematite - Google Patents
Beneficiation process for high-sulfur hematite Download PDFInfo
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Abstract
Provided is a beneficiation process for high-sulfur hematite, which is characterized in that two-section continuous ball-milling and screening are performed on the raw ore, magnetic separation is performed on the discharged ore, anion reverse flotation roughing is performed on magnetic-separated concentrate, anion reverse flotation agents are added, anion reverse flotation choiceness is performed on anion reverse flotation roughing concentrate, anion reverse flotation choiceness tailings are combined with anion reverse flotation roughing tailings and then are subjected to anions reverse flotation scavenging, cation reverse flotation roughing is performed on anion reverse flotation scavenging concentrate, collector dodecylamine is added, cation reverse flotation choiceness is performed on cation reverse flotation roughing concentrate, collector dodecylamine is added, cation reverse flotation choiceness concentrate and anion reverse flotation choiceness concentrate are combined into final iron ore concentrate, and anion reverse flotation scavenging tailings, cation reverse flotation roughing tailings, cation reverse flotation choiceness tailings and strong magnetic tailings are finally combined into final tailings. The beneficiation process for high-sulfur hematite improves content of iron, reduces content of silicone and sulfur and provides high-quality iron ore concentrate for steelmaking production and is suitable for beneficiation of high-sulfur magnetite.
Description
Technical field
The present invention relates to technique of preparing field, particularly a kind of Beneficiation process for high-sulfur hematite.
Background technology
Along with the fast development of steel and iron industry, iron ore demand rises year by year, compared with World Iron ore resource, the iron ore resource total amount of China is more, but iron ore poor quality, complex structure, disseminated grain size are thin, iron mineral kind is not single, rich ore content is few, and 97.5% ore needs can utilize after ore dressing.At present sulfur mass fraction is greater than 0.3 hematite and is called high-sulfur bloodstone.High-sulfur bloodstone can be discharged sulfur dioxide gas atmosphere pollution in steel-making, and in steel, the too high meeting of sulfur-bearing becomes fragile steel simultaneously, and therefore countries in the world steel plant all make great efforts to improve by the content of sulphur in reduction iron ore the quality of iron and steel.
Existing sulfur method has Physical, chemical method and bioanalysis.The at present industrial sulfur method generally adopting is Physical, by washing, as gravity treatment, magnetic separation, flotation or its combined process flow, iron, the two resources of sulphur is reasonably utilized.And the difficulty that adopts Physical to make iron ore propose iron desulfurization is how to use method for floating separation of iron mineral and sulfur mineral.Because the sulfur mineral in ore mainly exists with pyrite form, the general floating agent adopting is xanthate and 2
#oil.The method that iron mineral separates with sulfur mineral has two kinds, and one is to select iron mineral first to select sulfur mineral before, but due to 2
#oil frothing capacity is strong, medicament action time itself is also longer, selecting the medicament remaining in after sulphur in ore pulp to fall silicon operation to follow-up flotation impacts, in actual production, occur that at the scene chats returns to the phenomenon that foam is more, be difficult for froth breaking, and along with chats constantly returns, the foam that swims in ore pulp surface increases the foam volume of roughly selecting operation, selective variation, the assorting room of medicament are affected, finally have influence on iron concentrate grade, so select xanthate as selecting sulphur medicament.The second is to select sulfur mineral after first selecting iron mineral, owing to selecting the starch adding in iron process, pyrite is had to inhibitory action, and the sulphur in iron ore concentrate is difficult to remove, so normally first select sulfur mineral.
At present, iron ore is carried the more employing anion reverse floatation of Fe and reducing Si, anion collecting agent has selective strong and in floatation process, can realize by multiple medicament variablees the control of flotation operation, but anion reverse floatation generally adopts normal temperature beneficiation collecting agent at present, require temperature just can there is good ore dressing effect 30 DEG C of left and right.The in the situation that of north of china in winter, adopt anion reverse floatation technique to carry Fe and reducing Si, effect is undesirable, and cation-collecting agent has good resistance to low temperature, can realize industrial production 10 DEG C of left and right, thus save the expense of heating fall, low production cost and System of Flotation Reagent simple.
At present, in the ore-dressing technique of high-sulfur bloodstone, in carrying iron, should fall silicon and fall again sulphur, temporarily also there is no instantiation.
Summary of the invention
The invention provides a kind of Beneficiation process for high-sulfur hematite, its objective is in meeting iron concentrate grade and the rate of recovery, the content of silicon and objectionable impurities sulphur in reduction iron ore concentrate, for STEELMAKING PRODUCTION provides high-quality iron ore concentrate.
The object of the invention is to realize by following technical proposals:
Beneficiation process for high-sulfur hematite of the present invention, it is characterized in that by grade be 30-33%, sulfur mass fraction is greater than 0.3% high-sulfur bloodstone raw ore and carries out two sections of Continuous Grindings, being milled to granularity is that more than 90% product of-200 order content feeds magnetic separation, adopt anion reverse floatation to fall sulphur to the magnetic concentrate obtaining and fall silicon, the concentrate that the anion reverse floatation obtaining is scanned adopts cation reverse flotation to carry Fe and reducing Si, the final high-quality iron ore concentrate that obtains, concrete steps are as follows:
1) by grade be 30-33%, sulfur mass fraction is greater than 0.3% high-sulfur bloodstone raw ore and feeds two sections of continuous ball millings, screening,
2) be that more than 90% ore discharge of-200 order content feeds weak magnetic by its granularity, the mine tailing of weak magnetic feeds strong magnetic,
3) concentrate of low intensity magnetic separation and the concentrate of high intensity magnetic separation merge that to have obtained iron grade be to feed anion reverse floatation together with 43.0%-47.30%, the sulfur content rough concentrate that is 0.6%-1.0% to roughly select, and add desulfurizing agent butyl xanthate 80-100g/t, PH adjusting agent NaOH 950-1150g/t, inhibitor DF 450-800g/t, activator CaO 320-420g/t, collecting agent 600-1000g/t
4) it is selected that the concentrate roughly selected of anion reverse floatation obtaining feeds anion reverse floatation, and add collecting agent 300-500g/t, feed anion reverse floatation together with the mine tailing that the selected mine tailing of anion reverse floatation is roughly selected with anion reverse floatation to scan,
5) concentrate that the anion reverse floatation obtaining is scanned feeds cation reverse flotation and roughly selects, and adds collecting agent lauryl amine 30-80g/t,
6) it is selected that the concentrate that the cation reverse flotation obtaining is roughly selected feeds cation reverse flotation, and add collecting agent lauryl amine 10-30g/t, the selected concentrate of the concentrate that cation reverse flotation is selected and anion reverse floatation is combined into final iron ore concentrate, its grade is 67.0-67.3%, sulfur content 0.030-0.040%, SiO
2content 3.3-4.5%, the selected mine tailing of the mine tailing that anion reverse floatation is scanned, the mine tailing that cation reverse flotation is roughly selected and cation reverse flotation forms flotation tailing, and this flotation tailing is combined into true tailings, its grade 12.0-14.5% with strong magnetic tail ore deposit.
The feature of Beneficiation process for high-sulfur hematite of the present invention is:
1, only use pyritous collecting agent butyl xanthate, and utilize the frothing capacity of anion collecting agent, by pyrite and together emersion of silica, on iron ore concentrate desulfurization method, have important breakthrough.In addition, in sweetening process, do not add 2
#oil, does not need to consider that a large amount of foams that oils foaming agent produces, on selecting the impact of iron process, have reduced reagent cost, has simplified technological process;
2, anion reverse floatation is scanned the concentrate employing cation reverse flotation of acquisition, can obtain again sub-fraction iron ore concentrate, improves the concentrate rate of recovery;
3, because anion reverse floatation has obtained most of iron ore concentrate in advance, thus the ore deposit amount that enters cation reverse flotation operation reduced, thus reduce cation reverse flotation dosing;
4, in technological process, because sulphur is mainly discharged from anion reverse floatation froth pulp, and the mine tailing of every section is all less than returning to last operation, the concentrate that anion reverse floatation is scanned to gained carries out cation reverse flotation and selects, both ensured the further recovery to iron ore concentrate, ensured simultaneously iron ore concentrate compared with low sulfur content;
5. the collecting agent using in anion reverse floatation technique is lower temperature collector, and slurry temperature when flotation is 10-15 DEG C.
The present invention, in carrying iron, had both fallen silicon, fell again sulphur, and the grade of its iron ore concentrate is 67.0-67.3%, sulfur content 0.030-0.040%, SiO
2content 3.3-4.5%, for STEELMAKING PRODUCTION provides high-quality iron ore concentrate.Iron recovery reaches 84.04-91.00% simultaneously, has improved economic benefit.And the present invention is also applicable to sorting of high-sulfur magnetic iron ore.
Brief description of the drawings
Fig. 1 is process chart of the present invention.
Detailed description of the invention
Below in conjunction with brief description of the drawings the specific embodiment of the present invention.
As shown in Figure 1, Beneficiation process for high-sulfur hematite of the present invention, it is characterized in that by grade be 30-33%, sulfur mass fraction is greater than 0.3% high-sulfur bloodstone raw ore and carries out two sections of Continuous Grindings, being milled to granularity is that more than 90% product of-200 order content feeds magnetic separation, its strong magnetic tail mineral products rate is 35%-40%, grade is 8-10%, and finally having obtained iron grade is the rough concentrate that 43.0%-47.30%, sulfur content are 0.6%-1.0%.Adopt anion reverse floatation to fall sulphur the magnetic separation rough concentrate of acquisition and fall silicon, the concentrate that the anion reverse floatation obtaining is scanned adopts cation reverse flotation to carry Fe and reducing Si, finally obtains high-quality iron ore concentrate.Concrete steps are as follows:
Embodiment mono-:
1) the high-sulfur bloodstone raw ore that is 30.5% by grade feeds two sections of continuous ball millings, screening,
2) its granularity is that more than 90% ore discharge of-200 order content feeds weak magnetic, and the mine tailing of weak magnetic feeds strong magnetic,
3) concentrate of weak magnetic and the concentrate of strong magnetic merge obtained that iron grade is 45.30%, sulfur content is 0.85%, SiO
2content is that 26.82% rough concentrate feeds together anion reverse floatation and roughly selects, and adds desulfurizing agent butyl xanthate 80-100g/t, PH adjusting agent NaOH 950-1150g/t, inhibitor DF 450-800g/t, activator CaO 320-420g/t, collecting agent 600-1000g/t
4) it is selected that the concentrate roughly selected of anion reverse floatation obtaining feeds anion reverse floatation, and add collecting agent 300-500g/t, feed anion reverse floatation together with the mine tailing that the selected mine tailing of anion reverse floatation is roughly selected with anion reverse floatation to scan,
5) grade obtaining is 50.2-53.1%, sulfur content is 0.03-0.05%, SiO
2content is that concentrate that 8.5-9.1% anion reverse floatation is scanned feeds cation reverse flotation and roughly selects, and adds collecting agent lauryl amine 30-80g/t,
6) it is selected that the concentrate that the cation reverse flotation obtaining is roughly selected feeds cation reverse flotation, and add collecting agent lauryl amine 10-30g/t, the selected concentrate of the concentrate that cation reverse flotation is selected and anion reverse floatation is combined into final iron ore concentrate, its grade is 67.15-67.20%, sulfur content is 0.035-0.040%, SiO
2content is 3.5-4.2%, and the selected mine tailing of the mine tailing that anion reverse floatation is scanned, the mine tailing that cation reverse flotation is roughly selected and cation reverse flotation forms flotation tailing, and this flotation tailing is combined into true tailings with strong magnetic tail ore deposit, and its grade is 12.82-14.20%.
Embodiment bis-:
1) the high-sulfur bloodstone raw ore that is 33% by grade feeds two sections of continuous ball millings, screening,
2) its granularity is that more than 90% ore discharge of-200 order content feeds weak magnetic, and the mine tailing of weak magnetic feeds strong magnetic,
3) concentrate of weak magnetic and the concentrate of strong magnetic merge that to have obtained iron grade be 47.30%, and sulfur content is 1.0%, SiO
2content is that 25.42% rough concentrate feeds together anion reverse floatation and roughly selects, and adds desulfurizing agent butyl xanthate 80-100g/t, PH adjusting agent NaOH 950-1150g/t, inhibitor DF 450-800g/t, activator CaO 320-420g/t, collecting agent 600-1000g/t
4) it is selected that the concentrate roughly selected of anion reverse floatation obtaining feeds anion reverse floatation, and add collecting agent 300-500g/t, feed anion reverse floatation together with the mine tailing that the selected mine tailing of anion reverse floatation is roughly selected with anion reverse floatation to scan,
5) grade obtaining is 53.3-55.6%, sulfur content is 0.035-0.053%, SiO
2content is that concentrate that 8.0-8.9% anion reverse floatation is scanned feeds cation reverse flotation and roughly selects, and adds collecting agent lauryl amine 30-80g/t;
6) it is selected that the concentrate that the cation reverse flotation obtaining is roughly selected feeds cation reverse flotation, and add collecting agent lauryl amine 10-30g/t, the selected concentrate of the concentrate that cation reverse flotation is selected and anion reverse floatation is combined into final iron ore concentrate, its grade is 67.3-67.42%, sulfur content is 0.037-0.039%, SiO
2content is 3.3-4.1%, and the selected mine tailing of the mine tailing that anion reverse floatation is scanned, the mine tailing that cation reverse flotation is roughly selected and cation reverse flotation forms flotation tailing, and this flotation tailing is combined into true tailings with strong magnetic tail ore deposit, and its grade is 12.78-14.16%.
The present invention, in carrying iron, had both fallen silicon, fell again sulphur, and its grade of the grade of its iron ore concentrate is 67.0-67.3%, sulfur content 0.030-0.040%, SiO
2content 3.3-4.5%, for STEELMAKING PRODUCTION provides high-quality iron ore concentrate.Iron recovery reaches 84-91.00% simultaneously, has improved economic benefit.And the present invention is also applicable to sorting of high-sulfur magnetic iron ore.
Claims (1)
1. a Beneficiation process for high-sulfur hematite, it is characterized in that by grade be 30-33%, sulfur mass fraction is greater than 0.3% high-sulfur bloodstone raw ore and carries out two sections of Continuous Grindings, be milled to granularity and more than 90% feed magnetic separation for-200 object product contents account for, obtain crude iron concentrate through weak magnetic-high intensity magnetic separation process, adopting anion reverse floatation to carry iron to the magnetic separation crude iron concentrate obtaining falls sulphur and falls silicon, the concentrate that the anion reverse floatation obtaining is scanned adopts cation reverse flotation to carry Fe and reducing Si, the final high-quality iron ore concentrate that obtains, concrete steps are as follows:
1) by head grade be 30-33%, sulfur mass fraction is greater than 0.3% high-sulfur hematite and feeds two sections of continuous ball millings, screening,
2) be that the ore discharge that-200 object product contents account for more than 90% feeds low intensity magnetic separation by its granularity, the mine tailing of low intensity magnetic separation feeds high intensity magnetic separation,
3) concentrate of low intensity magnetic separation and the concentrate of high intensity magnetic separation merge that to have obtained iron grade be to feed anion reverse floatation together with 43.0%-47.30%, the sulfur content rough concentrate that is 0.6%-1.0% to roughly select, and add desulfurizing agent butyl xanthate 80-100g/t, PH adjusting agent NaOH 950-1150g/t, inhibitor DF 450-800g/t, activator CaO 320-420g/t, lower temperature collector 600-1000g/t
4) it is selected that the iron ore concentrate of the anion reverse floatation of acquisition being roughly selected feeds anion reverse floatation, and add collecting agent 300-500g/t, feed anion reverse floatation together with the mine tailing that the selected mine tailing of anion reverse floatation is roughly selected with anion reverse floatation to scan,
5) concentrate that the anion reverse floatation obtaining is scanned feeds cation reverse flotation and roughly selects, and adds collecting agent lauryl amine 30-80g/t,
6) it is selected that the concentrate that the cation reverse flotation obtaining is roughly selected feeds cation reverse flotation, and add collecting agent lauryl amine 10-30g/t, the selected concentrate of the concentrate that cation reverse flotation is selected and anion reverse floatation is combined into final iron ore concentrate, its grade is 67.0-67.3%, sulfur content 0.030-0.040%, SiO
2content 3.3-4.5%, the selected mine tailing of the mine tailing that anion reverse floatation is scanned, the mine tailing that cation reverse flotation is roughly selected and cation reverse flotation forms flotation tailing, and the mine tailing of this flotation tailing and high intensity magnetic separation is combined into true tailings, its grade 12.0-14.5%.
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| JP6009999B2 (en) * | 2013-06-27 | 2016-10-19 | 株式会社神戸製鋼所 | Method for producing low sulfur-containing iron ore |
| CN104069937A (en) * | 2014-05-16 | 2014-10-01 | 马钢集团设计研究院有限责任公司 | Ore dressing method for removing pyrrhotite from iron ore |
| CN104259009B (en) * | 2014-08-08 | 2017-01-11 | 西北矿冶研究院 | Copper-iron-sulfur separation composite inhibitor and high-sulfur refractory copper-iron ore beneficiation method |
| CN104259014B (en) * | 2014-09-05 | 2018-11-13 | 吉首大学 | Rotor whirlwind two-stage series mineral floating defoaming device |
| CN104624383B (en) * | 2014-12-09 | 2017-02-01 | 鞍钢集团矿业有限公司 | Hematite reverse flotation inhibitor and preparation and use method thereof |
| CN106345605B (en) * | 2016-11-27 | 2019-10-18 | 玉溪大红山矿业有限公司 | A kind of low-grade difficulty of fine silicate-type selects red iron rougher concentration upgrading drop silicon technology |
| CN106733226B (en) * | 2016-12-19 | 2019-03-01 | 华北理工大学 | The pillar cation reverse flotation technique of Hematite |
| CN107051716A (en) * | 2017-06-14 | 2017-08-18 | 北京中矿东方矿业有限公司 | A kind of strong magnetic reverse flotation dephosphorization desiliconization ore-dressing technique of Gao Lin Caviar shape bloodstone |
| CN108355827A (en) * | 2018-02-09 | 2018-08-03 | 鞍钢集团矿业设计研究院有限公司 | Continuous Grinding magnetic weight flow processing mixed type iron ore technique |
| CN108355828A (en) * | 2018-02-09 | 2018-08-03 | 鞍钢集团矿业设计研究院有限公司 | The full permanent magnetism short route of Continuous Grinding handles mixed type iron ore technique |
| CN111744679A (en) * | 2020-07-10 | 2020-10-09 | 攀枝花学院 | Iron ore flotation method |
| CN111905918B (en) * | 2020-09-09 | 2021-11-12 | 中钢集团马鞍山矿山研究总院股份有限公司 | Method for preparing ultrapure iron concentrate by deep processing of commercial grade magnetite concentrate |
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Address after: 114001 Anshan District, Liaoning, No. 219 Road, No. 39, Tiedong Patentee after: Anshan Iron and Steel Group Mining Co., Ltd. Address before: 114001 Anshan District, Liaoning, No. 219 Road, No. 39, Tiedong Patentee before: Angang Group Mine Company |