CN103397176A - Combined ore-dressing method of extracting iron and removing phosphorus from low-lean, high-phosphorous and refractory iron ore - Google Patents
Combined ore-dressing method of extracting iron and removing phosphorus from low-lean, high-phosphorous and refractory iron ore Download PDFInfo
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Abstract
The invention belongs to the field of ore dressing and particularly relates to a combined ore-dressing method of extracting iron and removing phosphorus from low-lean, high-phosphorous and refractory iron ore. The combined ore-dressing method comprises the following steps of: crushing and roasting the low-lean, high-phosphorous and refractory iron ore with 25-40% of TFe and 0.70-2.40% of P, then carrying out water quenching, then grinding into fine ore with the granularity of being 160-200 meshes, adopting a wet-type magnetic dressing method or directly grinding the refractory iron ore with more than 40% of TFe and less than 0.7% of P to be iron ore powder with the granularity of being 160-200 meshes, adding water and industrial sulphuric acid into the iron ore powder, controlling the concentration of ore pulp to be 18%-20%, carrying out acid-leaching refined phosphorus removal by adopting a low-concentration acid method with the concentration of the sulphuric acid of being 3.5%-4.5%, carrying out washing and vacuum filtering on the iron ore powder after acid leaching, and obtaining a high-iron and low-phosphorus concentrate iron powder product with 40-65% of TFe and 0.06%-0.075% of P. The combined ore-dressing method has the advantages that the iron ore concentrate powder with all indexes meeting the need of smelting iron or producing reduced iron can be obtained, the industrial production scale is large, the mechanization degree of equipment is high and the promotion for low-lean, high-phosphorous and refractory iron ore production places is suitable.
Description
Technical field
The invention belongs to the technique of preparing field, particularly a kind of low poor, high phosphorus, refractory iron ore are put forward the beneficiation combined method method of iron dephosphorization.
Background technology
China is the large output of steel of the first in the world state, output of steel was broken through 700,000,000 tons in 2013, although China is the abundant country of iron ore deposit, but country that poor iron ore deposit is abundant, low poor slow-witted ore deposit accounts for iron ore deposit more than 97%, therefore, China every year need to be from the high grade iron ore of external import more than 600,000,000 tons, and domestic a large amount of low poor slow-witted iron ore is not well developed and fully utilizes.Nowadays, country puts into effect the related industries policy, encourages technological development and the application of the low lean ore refractory iron ore of exploitation.
(district) economized in Hubei, Hunan, Yunnan, Sichuan, Guizhou, Guangxi, Jiangxi and Gansu etc. in China, the roe shape refractory hematite of a kind of low poor, high phosphorus, difficult choosing is extensively distributing, ore is roe shape, clumpy structure more, and minority tool beans shape, reniform structure, be shown in Figure of description Fig. 2.The concentric(al) circles that consists of siliceous and irony in some oolith can reach tens of layers, and oolitic hematite embedding cloth is superfine, often and spathic iron ore, limonite, chamosite, clay and collophanite symbiosis, common ore dressing poor effect, and iron ore is phosphorous higher, iron level generally 25%～45%, phosphorus content is generally 0.3%～2.4%, is the low poor refractory iron ore type of high phosphorus of the most difficult choosing of generally acknowledging both at home and abroad at present.Such Iron Ore Reserve, up to 30～5,000,000,000 tons, accounts for 10% of China's iron ore total reserves., there is very significance in good this ore deposit of comprehensive utilization exploitation.
At present, traditional dephosphorizing method of high-phosphorus iron ore mainly contains physical concentration method, chemical process, microbial process, metallurgy and the melting and reducings such as magnetic separation, gravity treatment, flotation.Study and show both at home and abroad, the general P content of the dephosphorization effect of these methods, more than 0.2%, do not reach simultaneously the requirement that improves the iron grade, and its production run cost is also relatively high, and iron loss is serious in the process of dephosphorization.For low poor, high phosphorus, difficulty select that oolitic hematite carries out effectively, environmental protection, the low cost method of carrying the iron dephosphorization is a puzzlement people's international problem always.
Summary of the invention
Problem for the prior art existence, the invention provides a kind of low poor, high phosphorus, refractory iron ore and put forward the beneficiation combined method method of iron dephosphorization, by by various low poor, high phosphorus, difficult ore dressing iron ore raw ore, carry out magnetizing roasting-shrend-wet magnetic separation and carry iron and preliminary dephosphorization, carry out again the low-concentration sulfuric acid leaching and combining of smart dephosphorization carry the iron dephosphorizing technology, obtain TFe:40～65%, the rate of recovery: 55～88%, the fine iron breeze of P:0.06%～0.075% makes high phosphorus hang down poor refractory iron ore resource utilization.
Realize that the technical scheme of the object of the invention carries out according to following steps:
(1) will be according to massfraction, low poor, the high phosphorus, the refractory iron ore that contain TFe:25～40%, P:0.70～2.40%, be broken into the fine particle of granularity≤20mm, at 700～900 ℃ of lower magnetizing roasting 1～2h, then through shrend, being polished into granularity is 160～200 purpose fine ores again, adopts the wet magnetic separation method of 1800～4500 Gs magneticstrengties to carry out ore dressing, obtains the powdered iron ore of TFe:45～65%, P:0.65%～0.7%, iron recovery 55～88%;
By massfraction, be perhaps that directly to be polished into granularity be 160～200 purpose powdered iron ore for the refractory iron ore of TFe>40%, P<0.7%;
(2) in above-mentioned powdered iron ore, add water and industrial sulphuric acid, be mixed with the powdered iron ore weight concentration and be 18 ~ 20%, h 2 so 4 concentration is 3.5 ~ 4.5% ore pulp, ore pulp is stirred to 4 ~ 6h, and stirring velocity is 180～200r/min, carries out lower concentration acidleach essence dephosphorization;
(3) acidleach filters out spent acid after finishing, and the powdered iron ore after acidleach is washed, after vacuum filtration, obtained the low-phosphorous concentrate iron powder of the high ferro product of TFe:40～65%, P:0.06%～0.075%.
The spent acid solution that obtains after described acidleach essence dephosphorization and the waste water after washing, the common polyacrylamide flocculant that adds lime powder and market to buy neutralizes, in making, with water pH value, reach 7～8, and precipitate mine tailing and impurity in water outlet, the water that obtains can carry out recycle.
Compared with prior art, characteristics of the present invention and beneficial effect are:
(1) technical scheme of the present invention is for the various high-phosphorus iron ores of P content 0.7～2.4%, must first carry out magnetizing roasting-shrend-be polished into 160 orders～200 order fine ore-wet magnetic separations and carry just dephosphorization-smart dephosphorization of low-concentration sulfuric acid leaching of iron, obtain the low-phosphorous high powdered iron ore product of P≤0.075, the purpose of magnetizing roasting-shrend is mainly when being beneficial to wet magnetic separation and carrying iron, also the ferric oxide particles in difficult ore dressing particle is magnetized and apatite particle and this crystalline network of combining closely very much of ferric oxide particles are further broken, can break the crystalline network of original complexity, the sulfuric acid of follow-up acidleach operation is entered in lattice, be convenient to follow-up dephosphorization, see Figure of description Fig. 3, magnetizing roasting is the weak magnetism mineral under certain temperature and atmosphere, as rhombohedral iron ore, limonite, spathic iron ore and pyrite etc. become the process of ferromagnetic magnetite or magnetic rhombohedral iron ore, be beneficial to follow-up magnetic separation and carry acidleach essence dephosphorization after iron, for the various higher phosphorous iron ores of P≤0.7%, can be polished into 160 orders～200 order fine ores, directly carry out low-concentration sulfuric acid leaching phosphorus, obtain the low ground phosphate rock product of P≤0.075%,
(2) to carry out that the dephosphorization acidleach adopts be sulfuric acid in the present invention, its mechanism is to utilize phosphatic rock under strong acidic condition, to generate the monocalcium phosphate that dissolves in solution, the sulfuric acid low price, be difficult for decomposing, low for equipment requirements, therefore from economy, environmental protection with several respects such as requirement of equipment are considered, determine to select the lower concentration acid solution to be the leaching acid solution;
(3) in invention, in acidleach, stir, sulfuric acid is fully contacted with phosphatic rock, improve speed of response and contact area, make its dephosphorization more thorough;
(4) technical scheme of the present invention can obtain the fine iron breeze of TFe:40～65%, P:0.06%～0.075%, its indices reaches be suitable for smelting iron or slag iron separating reducing is produced the fine iron breeze of reduced iron needs fully, makes high phosphorus hang down poor refractory iron ore resource utilization.
Suitability for industrialized production scale of the present invention is large, and the plant machinery degree is high, suitablely in low poor, high phosphorus, the refractory iron ore place of production, promotes.
The accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention;
Fig. 2 is the scanning electron microscope shape appearance figure of low poor, high phosphorus, refractory iron ore;
Fig. 3 is low poor, the high phosphorus after calcining-water quenching, the scanning electron microscope shape appearance figure of refractory iron ore.
Embodiment
Embodiment 1
Selecting the Hunan oolitic hematite to be polished into granularity the massfraction low-phosphorous difficulty of high ferro that is TFe:42.44%, P:0.385% is 160～200 purpose powdered iron ore;
In above-mentioned powdered iron ore, add water and industrial sulphuric acid, be mixed with the powdered iron ore weight concentration and be 20%, h 2 so 4 concentration is 3.5% ore pulp, and ore pulp is stirred to 5h, stirring velocity is 180r/min, carries out lower concentration acidleach essence dephosphorization;
After acidleach finishes, filter out spent acid, the powdered iron ore after acidleach is washed, after vacuum filtration, obtained the low-phosphorous concentrate iron powder of the high ferro product of TFe:42.64%, P:0.062%.
The spent acid solution that obtains after described acidleach essence dephosphorization and the waste water after washing, the common polyacrylamide flocculant that adds lime powder and market to buy neutralizes, in making, with water pH value, reach 7～8, and precipitate mine tailing and impurity in water outlet, the water that obtains can carry out recycle.
Embodiment 2
will be according to massfraction, contain TFe:25.64%, the low iron high phosphorus difficulty of P:2.38% is selected the Hunan oolitic hematite, its scanning electron microscope (SEM) photograph as shown in Figure 2, be broken into the fine particle of granularity≤20mm, at 800 ℃ of lower roasting 1.5h, then through shrend, being polished into granularity is 160～200 purpose fine ores again, adopt the wet magnetic separation method of 2800～3500 Gs magneticstrengties to carry out magnetic separation, obtain TFe:65.12%, P:0.69%, the powdered iron ore of iron recovery 56.18%, its scanning electron microscope (SEM) photograph as shown in Figure 3, from Fig. 2, in 3, can find out, ferric oxide particles in difficult ore dressing particle magnetizes and apatite particle and this crystalline network of combining closely very much of ferric oxide particles is further broken, after the roasting shrend between the mineral facies of parcel, crack has appearred originally mutually, therefore, when using sulfuric acid to leach, acid solution can enter into originally the phase of parcel mutually by these cracks, with phosphorus reaction, reach better dephosphorization effect.
In above-mentioned powdered iron ore, add water and industrial sulphuric acid, be mixed with the powdered iron ore weight concentration and be 18%, h 2 so 4 concentration is 3.5% ore pulp, and ore pulp is stirred to 5h, stirring velocity is 195r/min, carries out lower concentration acidleach essence dephosphorization;
After acidleach finishes, filter out spent acid, the powdered iron ore after acidleach is washed, after vacuum filtration, obtained the low-phosphorous concentrate iron powder of the high ferro product of TFe:65.26%, P:0.068%.
The spent acid solution that obtains after described acidleach essence dephosphorization and the waste water after washing, the common polyacrylamide flocculant that adds lime and market to buy neutralizes, in making, with water pH value, reach 7～8, and precipitate mine tailing and impurity in water outlet, the water that obtains can carry out recycle.
Embodiment 3
Will be according to massfraction, the low iron high phosphorus difficulty that contains TFe:35.04%, P:2.08% is selected the Hunan oolitic hematite, be broken into the fine particle of granularity≤20mm, at 700 ℃ of lower roasting 2.0h, then through shrend, being polished into granularity is 160～200 purpose fine ores again, carries out wet magnetic separation, obtains the powdered iron ore of TFe:63.89%, P:0.68%, iron recovery 57.18%;
In above-mentioned powdered iron ore, add water and industrial sulphuric acid, be mixed with the powdered iron ore weight concentration and be 18%, h 2 so 4 concentration is 4.0% ore pulp, and ore pulp is stirred to 4h, stirring velocity is 200r/min, carries out lower concentration acidleach essence dephosphorization;
After acidleach finishes, filter out spent acid, the powdered iron ore after acidleach is washed, then, after adopting the wet magnetic separation method of 2800～3500 Gs magneticstrengties to carry out magnetic separation, vacuum filtration, obtain the low-phosphorous concentrate iron powder of the high ferro product of TFe:65.26%, P:0.068%.
The spent acid solution that obtains after described acidleach essence dephosphorization and the waste water after washing, the common polyacrylamide flocculant that adds lime powder and market to buy neutralizes, in making, with water pH value, reach 7～8, and precipitate mine tailing and impurity in water outlet, the water that obtains can carry out recycle.
Embodiment 4
Take phosphorus difficulty in iron in TFe:40.16%, P:0.8%, select the Hunan oolitic hematite as raw material, it is carried out respectively to direct acidleach dephosphorization and magnetizing roasting-shrend-wet magnetic separation is carried iron-acidleach essence dephosphorization, contrast.
(1) direct acidleach dephosphorization:
Raw ore directly is polished into to 160～200 orders, with addition of water and industrial sulphuric acid, make that pulp density reaches 19%, acid concentration reaches 3.8%, after under 190r/min, stirring 6h, filter out spent acid, to breeze washing 3 times, oven dry, the powdered iron ore index that obtains is the low phosphor iron fine ore of TFe:40.86%, P:0.126%.
The spent acid solution that obtains after described acidleach essence dephosphorization and the waste water after washing, the common polyacrylamide flocculant that adds lime powder and market to buy neutralizes, in making, with water pH value, reach 7～8, and precipitate mine tailing and impurity in water outlet, the water that obtains can carry out recycle.
(2) magnetizing roasting-shrend-acidleach dephosphorization:
Raw ore is broken into to the fine particle of granularity≤20mm, direct magnetizing roasting 1.0h at 900 ℃ of temperature, then through shrend, then to be polished into granularity be 160～200 purpose fine ores, wash, after vacuum filtration, obtain the phosphorous higher powdered iron ore of TFe:40.76%, P:0.65%;
In above-mentioned powdered iron ore, add water and industrial sulphuric acid, be mixed with the powdered iron ore weight concentration and be 18%, h 2 so 4 concentration is 3.8% ore pulp, and ore pulp is stirred to 6h, stirring velocity is 190r/min, carries out lower concentration acidleach essence dephosphorization;
After acidleach finishes, filter out spent acid, the powdered iron ore after acidleach is washed, after vacuum filtration, directly obtained the low-phosphorous concentrate iron powder of the high ferro product of TFe:40.86%, P:0.065%.
The spent acid solution that obtains after described acidleach essence dephosphorization and the waste water after washing, the common polyacrylamide flocculant that adds lime and market to buy neutralizes, in making, with water pH value, reach 7～8, and precipitate mine tailing and impurity in water outlet, the water that obtains can carry out recycle.
Can find out that for TFe:40% the iron ore of P:0.7% left and right still adopts magnetizing roasting-shrend-wet magnetic separation to carry iron-acidleach essence dephosphorization effect better.
Embodiment 5
Take phosphorus difficulty in iron in TFe:40.16%, P:0.68%, select the Hunan oolitic hematite as raw material, before adopting after dephosphorization in and water carry out the acidleach dephosphorization.
In adopting, with water pH value, reaching is 7～8, there is no impurity.
Raw ore directly is polished into to 160～200 orders, with addition of water and industrial sulphuric acid, make that pulp density reaches 18.5%, acid concentration reaches 4.5%, after under 180r/min, stirring 6h, filter out spent acid, to breeze washing 3 times, oven dry, the powdered iron ore index that obtains is the low phosphor iron fine ore of TFe:40.85%, P:0.074%.
The spent acid solution that obtains after described acidleach essence dephosphorization and the waste water after washing, the common polyacrylamide flocculant that adds lime powder and market to buy neutralizes, in making, with water pH value, reach 7～8, and precipitate mine tailing and impurity in water outlet, the water that obtains can continue recycling.
Claims (2)
1. one kind low poor, high phosphorus, refractory iron ore are put forward the beneficiation combined method method of iron dephosphorization, it is characterized in that carrying out according to following steps:
(1) will be according to massfraction, low poor, the high phosphorus, the refractory iron ore that contain TFe:25～40%, P:0.70～2.40%, be broken into the fine particle of granularity≤20mm, at 700～900 ℃ of lower magnetizing roasting 1～2h, then through shrend, being polished into granularity is 160～200 purpose fine ores again, adopts the wet magnetic separation method of 1800～4500Gs magneticstrength to carry out ore dressing, obtains the powdered iron ore of TFe:45～65%, P:0.65%～0.70%, iron recovery 55～88%;
By massfraction, be perhaps that directly to be polished into granularity be 160～200 purpose powdered iron ore for the refractory iron ore of TFe>40%, P<0.7%;
(2) in above-mentioned powdered iron ore, add water and industrial sulphuric acid, be mixed with the powdered iron ore mass concentration and be 18 ~ 20%, h 2 so 4 concentration is 3.5% ~ 4.5% ore pulp, ore pulp is stirred to 4 ~ 6h, and stirring velocity is 180～200r/min, carries out lower concentration acidleach essence dephosphorization;
(3) acidleach filters out spent acid after finishing, and the powdered iron ore after acidleach is washed, after vacuum filtration, obtained the low-phosphorous concentrate iron powder of the high ferro product of TFe:40～65%, P:0.06%～0.075%.
2. a kind of low poor, high phosphorus according to claim 1, refractory iron ore are put forward the beneficiation combined method method of iron dephosphorization, it is characterized in that in the spent acid and the waste water after washing that after described acidleach essence dephosphorization, obtain, the common polyacrylamide flocculant that adds lime powder and market to buy neutralizes, in making, with water pH value, reach 7～8, and mine tailing and impurity in the precipitation water outlet, the water that obtains can carry out recycle.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104673994A (en) * | 2014-04-30 | 2015-06-03 | 内蒙古科技大学 | Ore dressing method for roasting magnetized weakly-magnetic iron ores under external-reducer-free conditions |
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