CN101862703A - A combined dressing and smelting method for producing iron concentrate from oolitic lean hematite - Google Patents
A combined dressing and smelting method for producing iron concentrate from oolitic lean hematite Download PDFInfo
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Abstract
本发明涉及一种鲕状贫赤铁矿生产铁精矿的选冶联合方法。本发明的技术方案是针对含铁30％-40％的鲕状贫赤铁矿，首先进行碎磨矿，磨矿后的矿浆进入强磁选机进行预选，弱磁性矿物进入强磁精矿，预先抛除尾矿；然后将强磁选精矿与煤粉混合，煤粉重量占精矿重量的10％-30％，在马弗炉内加热到900-1100℃，保温1-3h进行磁化焙烧；磁化焙烧后的矿样经冷却后再进行湿磨矿，然后给入到弱磁选机进行弱磁分选，磁性矿物进入弱磁精矿，产出优质铁精矿。获得铁精矿品位＞64％，含磷＜0.15％，含硫＜0.10％。本发明特点是工艺流程简单，技术经济指标好，产品质量优。The invention relates to a combined dressing and smelting method for producing iron concentrate from oolitic lean hematite. The technical solution of the present invention is aimed at the oolitic lean hematite with iron content of 30%-40%, first crushing and grinding, the ore slurry after grinding enters the strong magnetic separator for pre-selection, and the weak magnetic minerals enter the strong magnetic concentrate, Remove the tailings in advance; then mix the strong magnetic separation concentrate with coal powder, the coal powder accounts for 10%-30% of the concentrate weight, heat it to 900-1100°C in the muffle furnace, and keep it warm for 1-3h for magnetization Roasting: The ore sample after magnetization roasting is cooled and then wet-grinded, and then sent to a weak magnetic separator for weak magnetic separation, and the magnetic minerals enter the weak magnetic concentrate to produce high-quality iron concentrate. The grade of the obtained iron concentrate is >64%, the phosphorus content is <0.15%, and the sulfur content is <0.10%. The invention is characterized by simple technological process, good technical and economic indicators and excellent product quality.
Description
Technical field
The present invention relates to the method for a kind of ore dressing and metallurgical associating, particularly relate to the selecting smelting combination method that a kind of roe shape lean hematite is produced iron ore concentrate.
Background technology
Iron is to find in the world the earliest, utilizes the extensivelyst, and a kind of metallic element that consumption is maximum, its consumption account for about 95% of metal total flow.Iron extracts from iron ore, and bloodstone and magnetic iron ore all are common iron ores.Oolitic hematite is a kind of of bloodstone, mainly is distributed in the ground such as Hubei, Hunan and Guizhou of China, and its reserves account for about 1/3 of China's bloodstone reserves, account for about 1/9 of iron ore deposit gross reserves.But the oolitic hematite disseminated grain size is superfine, and frequent and siderite, chamosite and phosphorus ore containing symbiosis or mutual parcel, therefore oolitic hematite is one of iron ore type of the most difficult choosing of generally acknowledging both at home and abroad at present, because its difficult choosing causes the type iron ore deposit not obtain substantially utilizing.Along with the high speed development of China's steel and iron industry, the poor iron ore reserves of high-grad iron ore deposit and Yi Xuan are exhausted day by day, thereby the new method that research and development are produced iron ore concentrate with roe shape lean hematite has great importance.
The research of oolitic hematite both at home and abroad comprises: dephosphorization, desiliconization, desulfurization, reverse flotation, the poly-group-reverse flotation of selectivity, high-gradient magnetic separation, direct-reduction process, acidleach, chloridising roasting-acid leaching process etc.But, the report of its successful enrichment but seldom [Zhang Jin is auspicious, Hu Li can wait. difficulty is selected the research and utilization present situation and the prospect of oolitic hematite, Chinese Mining Industry, 2007,16 (7): 74-76].
Wang Yanmin etc. are at the mineral composition of Guangxi village autumn oolitic hematite and the characteristics of institute's adopting process flow process at present, carried out magnetic matrix, background field intensity, have given the ore deposit flow velocity and than tests such as magnetic loading amounts.Reach a conclusion and be: 1. high-gradient magnetic method can effectively sort the thin mud of the strong magnetic tail of village autumn oolitic hematite that contains the micro-size fraction iron mineral; 2. the structural parameters of magnetic matrix net, background field intensity, give the ore deposit flow rate and than magnetic loading, the influence that the sample High-gradient Magnetic is separated index the most obviously [Wang Yanmin, Li Mingde. the high-gradient magnetic separation of oolitic hematite. Mineral Engineering, 1986,6 (8): 38-40].
Wang Jing etc. adopt quadrature float test method, have investigated the major influence factors of Hezhang, Guizhou oolitic hematite flotation, reach a conclusion at last: the 1. suitable ore grinding time, extremely important to the flotation of oolitic hematite; 2. to make collecting agent obvious to the enrichment of iron ore concentrate for lauryl amine, but its foam is unusual abundant and stable very big to scraping the influence of bubble and subsequent job, so, select suitable adjustment agent to eliminate the harmful effect of bubble, will be that the emphasis that from now on oolitic hematite is carried out flotation research is dealt with problems; 3. used dosing is bigger, reduces dosing and selects medicament more efficiently, be from now on striving direction [Wang Jing, Shang Yanbo open deep. oolitic hematite flotation experiment Primary Study. Mineral Engineering, 2004,24 (3): 38-40].
Statement literary composition etc. adopts fixed bed process and fluidized bed method, heating and outer heating have been carried out direct reduction magnetic separation test to Hezhang, Guizhou oolitic hematite in comprising, and test of the rotary kiln for directly reducing of semi-industrial scale and rotary kiln model test, process has been carried out thermodynamic analysis.Reach a conclusion at last: 1. oolitic hematite directly reduces, and the heating rotary kiln is for well beyond the reduction apparatus; 2. anthracite is made reducing agent reduction oolitic hematite, and its performance is good than bituminous coal; 3. adopt fixed bed or heat rotary kiln outward oolitic hematite is directly reduced, also original product carries out the low intensity magnetic separation separation, can obtain to separate preferably index [statement literary composition, Ceng Yongzhen, Chen Qiping. Hezhang, Guizhou oolitic hematite directly reduces the magnetic separation experimental study. metal mine, 1997, (11): 13-16,3].
End is got up, and mainly is divided into two big classes at the research method of oolitic hematite, and a class is a beneficiating method, mainly comprises flotation and magnetic separation, and another kind of is metallurgy method, as direct reduction, reduction roasting etc.But for the ore of difficult choosing like this, single beneficiating method can not obtain high-grade iron ore concentrate (the iron grade is more than 60%), be feasible and remove impurity such as phosphorus in the ore, sulphur, silicon with floatation, but the grade of flotation iron ore concentrate is difficult to reach requirement; For metallurgy method, no matter be direct reduction, or reduction roasting, for poor iron ore, all be difficult to obtain good effect.
Summary of the invention
The present invention is directed to the problem that exists in the present roe shape lean hematite research and development, a kind of ore dressing and metallurgical new method that combines of producing fine quality iron concentrate from roe shape lean hematite is provided, be beneficial to the development and use of such ore, alleviate the imbalance between supply and demand of iron ore.
Technological process of the present invention may be summarized to be " high magnetic pre-selection-magnetizing roast-weak magnetic separation ", promptly at the roe shape lean hematite of iron content 30%-40%.Concrete grammar is as follows:
At first carry out the comminution ore deposit, wet-milling is to-200 order content 75%-85%, ore pulp behind the ore grinding enters intensity magnetic separator and carry out preliminary election under the magnetic field intensity of 700kA/m-1000kA/m, magnetic mineral enters strong magnetic concentrate, non magnetic ore enters mine tailing, can throw the 30%-40% that accounts for raw ore except that the weight of mine tailing in advance, concentrate grade can improve 10-15 percentage point than raw ore; The high intensity magnetic separation concentrate mixes with coal dust, and the weight of coal dust accounts for the 10%-30% of concentrate weight, is heated to 900-1100 ℃ in Muffle furnace, and insulation 1-3h carries out magnetizing roast, makes weak magnetic mineral be converted into strongly magnetic mineral; Sample ore after the magnetizing roast is the ore deposit of regrinding after cooling, wet-milling accounts for 75%-90% to-200 orders, feed the low intensity magnetic separation machine after sizing mixing, under the field intensity of 200kA/m-300kA/m, carry out weak magnetic separation, magnetic mineral enters inferior fine magnetite concentrate, become final product-one-level fine quality iron concentrate, phosphorous, sulphur all meets the requirement of smelting, simultaneously the output weakly magnetic tailings.
Characteristics of the present invention are, technological process is simple, and technical-economic index is good, and product is a fine quality iron concentrate, the ferrous grade height, and foreign matter of phosphor, sulfur content are low.
Description of drawings
Fig. 1 is a process chart of the present invention.
The specific embodiment
Embodiment 1:
Roe shape lean hematite (primary sample): TFe:31.40%, P:0.12%, S:0.05%, SiO
2: 23.91%, CaO:5.23%, MgO:1.86%.(quality percentage composition, down together)
At first carry out the comminution ore deposit, wet-milling is to-200 order content 79.6%, and the ore pulp behind the ore grinding enters intensity magnetic separator and carry out preliminary election under the magnetic field intensity of 780kA/m, and magnetic mineral enters strong magnetic concentrate, and non magnetic ore enters mine tailing, throws in advance and removes mine tailing; The high intensity magnetic separation concentrate mixes with coal dust, and the weight of coal dust accounts for 15% of concentrate weight, is heated to 950 ℃ in Muffle furnace, and insulation 1.5h carries out magnetizing roast; The magnetizing roast sample ore is the ore deposit of regrinding after cooling, and wet-milling accounts for 82.5% to-200 orders, feeds the low intensity magnetic separation machine after sizing mixing, and carries out weak magnetic separation under the field intensity of 200kA/m, and magnetic mineral enters inferior fine magnetite concentrate, becomes final fine quality iron concentrate product.
The present embodiment result is: the high intensity magnetic separation concentrate yield is 64.8%, throws tail 35.2% in advance, and concentrate grade 40.05%, iron recovery are 83.02%; Roasted product iron grade 44.82%, low intensity magnetic separation concentrate yield 29.64%, concentrate contain Fe grade 64.47%, to the raw ore rate of recovery 61.13%.Impurity content is respectively: phosphorous 0.10%, and sulfur-bearing 0.06%, siliceous 8.91%.
Embodiment 2:
Roe shape lean hematite (primary sample): Tfe:30.80%, P:0.14%, S:0.08%, SiO
2: 22.45%, CaO:5.96%, MgO:1.93%.
At first carry out the comminution ore deposit, wet-milling is to-200 order content 81.50%, and the ore pulp behind the ore grinding enters intensity magnetic separator and carry out preliminary election under the magnetic field intensity of 820kA/m, and magnetic mineral enters strong magnetic concentrate, and non magnetic ore enters mine tailing, throws in advance and removes mine tailing; The high intensity magnetic separation concentrate mixes with coal dust, and the weight of coal dust accounts for 20% of concentrate weight, is heated to 1000 ℃ in Muffle furnace, and insulation 2h carries out magnetizing roast; The magnetizing roast sample ore is the ore deposit of regrinding after cooling, and wet-milling accounts for 84% to-200 orders, feeds the low intensity magnetic separation machine after sizing mixing, and carries out weak magnetic separation under the field intensity of 230kA/m, and magnetic mineral enters inferior fine magnetite concentrate, becomes final fine quality iron concentrate product.
The present embodiment result is: the high intensity magnetic separation concentrate yield is 62.3%, throws tail 37.7% in advance, and concentrate grade 41.26%, iron recovery are 81.88%; Roasted product iron grade 45.91%, low intensity magnetic separation concentrate yield 28.02%, concentrate contain Fe grade 65.24%, to the raw ore rate of recovery 60.09%.Impurity content is respectively: phosphorous 0.12%, and sulfur-bearing 0.09%, siliceous 8.22%.
Claims (4)
1. a roe shape lean hematite is produced the selecting smelting combination method of iron ore concentrate, it is characterized in that roe shape lean hematite at iron content 30%-40%, at first carry out the comminution ore deposit, wet-milling is to-200 order content 75%-85%, ore pulp behind the ore grinding enters intensity magnetic separator and carries out high magnetic pre-selection, magnetic mineral enters concentrate, and non magnetic ore enters mine tailing, throws in advance and removes mine tailing; The high intensity magnetic separation concentrate mixes with coal dust, and magnetizing roast is carried out in heating and insulation in Muffle furnace; Sample ore after the magnetizing roast is the ore deposit of regrinding after cooling, and wet-milling accounts for 75%-90% to-200 orders, feeds the low intensity magnetic separation machine after sizing mixing and carries out weak magnetic separation, and magnetic mineral enters inferior fine magnetite concentrate, becomes final fine quality iron concentrate product, while output weakly magnetic tailings.
2. roe shape lean hematite according to claim 1 is produced the selecting smelting combination method of iron ore concentrate, it is characterized in that described high intensity magnetic separation magnetic field intensity is 700kA/m-1000kA/m.
3. roe shape lean hematite according to claim 1 is produced the selecting smelting combination method of iron ore concentrate, it is characterized in that magnetic concentrate mixes with coal dust in the described magnetizing roast operation, the weight of coal dust accounts for the 10%-30% of concentrate weight, and sintering temperature is 900-1100 ℃, and temperature retention time is 1-3h.
4. roe shape lean hematite according to claim 1 is produced the selecting smelting combination method of iron ore concentrate, it is characterized in that the magnetic field intensity of the low intensity magnetic separation behind the described magnetizing roast product ore grinding is 200kA/m-300kA/m.
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102078838A (en) * | 2010-12-06 | 2011-06-01 | 河北钢铁集团矿业有限公司 | Mineral preselection method of weakly magnetic ore |
| CN102220481A (en) * | 2011-05-26 | 2011-10-19 | 山东乾舜矿冶科技股份有限公司 | Process for extracting iron from high-silicon aluminum haematite |
| CN104451124A (en) * | 2014-11-17 | 2015-03-25 | 长沙有色冶金设计研究院有限公司 | Method for iron increase and dephosphorization of low-grade high-phosphorus oolitic hematite |
| CN104588203A (en) * | 2015-01-29 | 2015-05-06 | 鞍钢集团矿业公司 | Beneficiation method for refractory iron ores |
| CN105170285A (en) * | 2015-09-24 | 2015-12-23 | 中冶北方（大连）工程技术有限公司 | Beneficiation process for reducing roasting, iron increase and impurity reduction of amphibole type oxidized ore |
| CN105597925A (en) * | 2015-12-30 | 2016-05-25 | 贵州省大方润丰化工有限公司 | Magnetic separation method of pyrite roasting slag |
| CN106000638A (en) * | 2016-05-20 | 2016-10-12 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Process for extracting iron from comprehensive tailings of refractory iron ores |
| CN107282288A (en) * | 2017-05-26 | 2017-10-24 | 内蒙古科技大学 | A kind of beneficiation method of synthetical recovery weak magnetism, rare earth and fluorite |
| CN108251635A (en) * | 2018-01-16 | 2018-07-06 | 东北大学 | Titanium vanadium mineral separation beneficiation method in a kind of bloodstone of titaniferous vanadium |
| CN108480035A (en) * | 2018-03-07 | 2018-09-04 | 鞍钢集团矿业有限公司 | A kind of method of pre-selection-roasting-magnetic separation process recycling magnetic tailing |
| CN112619882A (en) * | 2020-11-10 | 2021-04-09 | 西北矿冶研究院 | Ore dressing method for siderite barite |
| CN112827644A (en) * | 2020-12-31 | 2021-05-25 | 武汉工程大学 | A kind of comprehensive utilization method of red mud for iron extraction and aluminum reduction |
| CN113798054A (en) * | 2021-08-23 | 2021-12-17 | 鞍钢集团矿业有限公司 | Pre-selection-fluidization roasting-grinding magnetic separation process for treating iron tailings |
| CN113798053A (en) * | 2021-08-23 | 2021-12-17 | 鞍钢集团矿业有限公司 | Reinforced recovery method of iron resource in Anshan-type iron tailings |
| CN114405675A (en) * | 2021-12-31 | 2022-04-29 | 玉溪大红山矿业有限公司 | Ore dressing process for iron ore mixed ore |
| CN115582216A (en) * | 2022-10-24 | 2023-01-10 | 新疆有色金属研究所 | Composite weak magnetic iron ore beneficiation process |
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Cited By (20)
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| CN102078838A (en) * | 2010-12-06 | 2011-06-01 | 河北钢铁集团矿业有限公司 | Mineral preselection method of weakly magnetic ore |
| CN102220481A (en) * | 2011-05-26 | 2011-10-19 | 山东乾舜矿冶科技股份有限公司 | Process for extracting iron from high-silicon aluminum haematite |
| CN102220481B (en) * | 2011-05-26 | 2012-05-30 | 山东乾舜矿冶科技股份有限公司 | Process for extracting iron from high-silicon aluminum hematite |
| WO2012159342A1 (en) * | 2011-05-26 | 2012-11-29 | 山东乾舜矿冶科技股份有限公司 | Process for extracting iron from high silicon alumohematite |
| CN104451124A (en) * | 2014-11-17 | 2015-03-25 | 长沙有色冶金设计研究院有限公司 | Method for iron increase and dephosphorization of low-grade high-phosphorus oolitic hematite |
| CN104588203A (en) * | 2015-01-29 | 2015-05-06 | 鞍钢集团矿业公司 | Beneficiation method for refractory iron ores |
| CN105170285A (en) * | 2015-09-24 | 2015-12-23 | 中冶北方（大连）工程技术有限公司 | Beneficiation process for reducing roasting, iron increase and impurity reduction of amphibole type oxidized ore |
| CN105597925A (en) * | 2015-12-30 | 2016-05-25 | 贵州省大方润丰化工有限公司 | Magnetic separation method of pyrite roasting slag |
| CN106000638A (en) * | 2016-05-20 | 2016-10-12 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Process for extracting iron from comprehensive tailings of refractory iron ores |
| CN106000638B (en) * | 2016-05-20 | 2017-09-26 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of refractory iron ore integrates mine tailing iron-extracting process |
| CN107282288A (en) * | 2017-05-26 | 2017-10-24 | 内蒙古科技大学 | A kind of beneficiation method of synthetical recovery weak magnetism, rare earth and fluorite |
| CN108251635A (en) * | 2018-01-16 | 2018-07-06 | 东北大学 | Titanium vanadium mineral separation beneficiation method in a kind of bloodstone of titaniferous vanadium |
| CN108480035A (en) * | 2018-03-07 | 2018-09-04 | 鞍钢集团矿业有限公司 | A kind of method of pre-selection-roasting-magnetic separation process recycling magnetic tailing |
| CN112619882A (en) * | 2020-11-10 | 2021-04-09 | 西北矿冶研究院 | Ore dressing method for siderite barite |
| CN112827644A (en) * | 2020-12-31 | 2021-05-25 | 武汉工程大学 | A kind of comprehensive utilization method of red mud for iron extraction and aluminum reduction |
| CN113798054A (en) * | 2021-08-23 | 2021-12-17 | 鞍钢集团矿业有限公司 | Pre-selection-fluidization roasting-grinding magnetic separation process for treating iron tailings |
| CN113798053A (en) * | 2021-08-23 | 2021-12-17 | 鞍钢集团矿业有限公司 | Reinforced recovery method of iron resource in Anshan-type iron tailings |
| CN114405675A (en) * | 2021-12-31 | 2022-04-29 | 玉溪大红山矿业有限公司 | Ore dressing process for iron ore mixed ore |
| CN114405675B (en) * | 2021-12-31 | 2023-05-16 | 玉溪大红山矿业有限公司 | Mineral separation process for iron ore mixed ore |
| CN115582216A (en) * | 2022-10-24 | 2023-01-10 | 新疆有色金属研究所 | Composite weak magnetic iron ore beneficiation process |
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