CN102094115A - Method for dephosphorizing phosphorus-containing hematite and preparing iron ore concentrate by using phosphorus-containing hematite - Google Patents
Method for dephosphorizing phosphorus-containing hematite and preparing iron ore concentrate by using phosphorus-containing hematite Download PDFInfo
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- CN102094115A CN102094115A CN 200910242408 CN200910242408A CN102094115A CN 102094115 A CN102094115 A CN 102094115A CN 200910242408 CN200910242408 CN 200910242408 CN 200910242408 A CN200910242408 A CN 200910242408A CN 102094115 A CN102094115 A CN 102094115A
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Abstract
The invention discloses a method for dephosphorizing phosphorus-containing hematite and preparing iron ore concentrates by using the phosphorus-containing hematite, belonging to the technical field of iron ore concentrate preparation. The invention realizes a method of low-temperature (400-600 DEG C) reduction magnetization and dephosphorization by adopting biomasses and adding dephosphorizing additives and the iron ore concentrates are obtained by carrying out magnetic separation on magnetized and dephosphorized minerals. The method has low production cost; the grades of obtained iron ores reach more than 60 percent; and the content of phosphorus contained in the iron ore concentrates is lower than 0.2 percent. Compared with the traditional process realizing magnetic transformation by taking coal as a reducing agent, the invention reduces the temperature of the magnetic transformation from original 800 DEG C to below 600 DEG C and can reduce the temperature of the magnetic transformation about 200 DEG C, thereby not only reducing the energy consumption, but also solving the problem that the magnetized minerals can not separate iron from silicates because quartz-containing components in the iron ores are softened at higher temperature; and in addition, the method has the advantages of convenience for equipment manufacture and maintenance and investment saving and also achieves the purposes of saving energy and reducing production cost.
Description
Technical field
The invention belongs to ferrous metal technique of preparing field, particularly a kind of phosphorous rhombohedral iron ore dephosphorization and prepare the method for iron ore concentrate.
Background technology
By the end of the end of the year 2007, Chinese iron ore deposit is verified total resources 60,700,000,000 t, and prediction is not found out more than stock number 1,000 hundred million t.Economically recoverable 112.90 hundred million t wherein, workable reserve accounts for 19% of total amount, only accounts for 7.1% of whole world reserves.China's iron ore deposit characteristics are that many, big ore deposit, middle-size and small-size ore deposit is few; Associated minerals are many, select the smelting difficulty big, and in identified iron ore deposit, difficulty selects the iron ore of smelting to account for 1/5, development and use cost height.A wherein topmost class iron ore is a high-phosphorus iron ore, also claims Ningxiang's formula ferruginous deposits, and its reserves account for 14.86% of total reserves, reach 37.2 hundred million.Be the maximum appositional pattern ferruginous depositss of China's the widest reserves of distribution, this class ferruginous deposits is distributed widely in province and SOUTH OF GANSU areas such as Hubei, Hunan, Jiangxi, Sichuan, Yunnan, Guizhou, Guangxi, the iron ore grade is 30%～45%, and phosphorous common higher w (P) is between 0.4%～1.1%.Phosphorus mainly with phosphatic rock or francolite form and other mineral paragenesis, is contaminated in the grain edges of ferric oxide mineral in the high-phosphorus iron ore, and embedding is distributed in quartz or the carbonate minerals, and a small amount of the tax is stored in the lattice of iron mineral.And phosphorite crystal mainly is column, needle-like or the embedding of shot shape and is distributed in iron mineral and the gangue mineral, and granularity is thinner, and is not easily separated sometimes or even below 2 μ m, belongs to refractory ore.Along with the iron and steel output of China reached 5.02 hundred million tons in 2008, the import volume of China's iron ore before 2008 and 2009 10 monthlyly surpass 400,000,000 tons, situation for the demand 50% above dependence on import of iron ore can not change in the quite a while in expectation, external iron ore appreciates again and again, made China's steel industry cause enormous economic loss, therefore be necessary to develop the huge low-grade and complicated iron ore of China's reserves, as high-phosphorus iron ore etc.
Containing the P boundary for iron ore is: the iron ore w (P)≤0.2%～1.2% that is used for converter of basic lining steel-making; Be used to smelt the iron ore w (P)≤0.05%～0.15% of the conventional cast pig iron; Be used to smelt the iron ore w (P)≤0.15%～0.6% of high phosphorus foundry iron.Because sintering and blast furnace ironmaking process are not had a function of dephosphorization, the phosphorus in the ore can all enter in the pig iron.For many years, the dephosphorization technology at the different properties iron ore has carried out comparatively deep research both at home and abroad, and main technique has reverse flotation, acidleach, microorganism dephosphorization.Because aspects such as economy and technology, such iron ore never obtains industrial application.
Summary of the invention
The purpose of this invention is to provide a kind of phosphorous rhombohedral iron ore dephosphorization and prepare the method for iron ore concentrate,, this method steps is as follows:
(1), gets phosphorous rhombohedral iron ore breeze and biomass material powder with phosphorous rhombohedral iron ore and biomass material separated pulverizing;
(2) take by weighing phosphorous rhombohedral iron ore breeze, biomass material powder and dephosphorization additive and mix compound, wherein each weight of material is such as down: phosphorous rhombohedral iron ore breeze: biomass material powder: dephosphorization additive=100: 10～30: 0.5～3;
(3) compound is carried out roasting, maturing temperature is 400～600 ℃, and in the roasting process, phosphorous rhombohedral iron ore is reduced magnetization and dephosphorization, after the roasting, is cooled to below 80 ℃ and obtains calcining;
(4) the gained calcining obtains iron ore concentrate through dry method or wet magnetic separation.
Phosphorous rhombohedral iron ore is selected iron level＞35% for use described in the step (1), the phosphorous rhombohedral iron ore of phosphorus content＜8%, preferred iron level＞35%, the phosphorous rhombohedral iron ore of phosphorus content＜1.5%.
Biomass material described in the step (1) is selected from least a in rice straw, wheat straw, corn stalk, bagasse, wood sawdust, abandoned mine wood, firewood, cogongrass and the cassava rattan.
Phosphorous ground hematite is broken to below 100 orders described in the step (1); Described biomass material is crushed to below 10 orders.
The dephosphorization additive is the material that contains Cl or contain S described in the step (2), is selected from any one or two or more combinations in ammonium sulfate, ammonium chloride, sulfuric acid, the hydrochloric acid.
The time of roasting described in the step (3) is 0.5～3h.
Iron level described in this patent, phosphorus content all refer to weight percent.
Major technology characteristics of the present invention are: the present invention is directed in the prior art in the high phosphorus kakoxene phosphorus content weight percent that can't be up to state standards and adopt coal to cause energy consumption high and cause under the silicate high temperature and adhesion problem occurs at comparatively high temps (greater than 800 ℃) below 0.2% and during rhombohedral iron ore reduction magnetization, propose a kind of employing biomass and add the method that the dephosphorization additive is realized low temperature (400-600 ℃) reduction magnetization and while dephosphorization, mineral carry out obtaining iron ore concentrate after the magnetic separation behind the magnetization dephosphorization, this method production cost is low, the iron ore grade that obtains reaches more than 60%, and phosphorus content is less than 0.2% in the iron ore concentrate.
The present invention realizes the magnetization of rhombohedral iron ore by adopting biomass and dephosphorization additive when 600 ℃ guarantee dephosphorization down.With traditional comparing as reductive agent realization magnetic conversion process with coal.Magnetic transforms by original 800 ℃ and is reduced to below 600 ℃, can reduce about 200 ℃ of magnetic invert point.This has not only reduced energy consumption, solved simultaneously owing to iron ore contains quartzy composition and under higher temperature, softened, make the mineral after the magnetization can't be with iron and the isolating problem of silicate, and biomass are renewable and clean energy resources, the energy is very abundant, and the total amount of biomass waste is equivalent to 50% of coal in China year produced quantity.Therefore, can utilize biomass energy well,, promote the improvement of socio-economic development and ecotope all to have very significant meaning for the energy resource system of setting up sustainable development in the mineral reduction field.
The inventive method is convenient to equipment making and maintenance, reduces investment outlay, and reaches simultaneously and has saved the energy, has reduced the purpose of production cost.
Embodiment
Following examples are primarily aimed at the representative phosphorous rhombohedral iron ore in Yichang, and to adopt dephosphorization additive and biomass be that main raw material carries out dephosphorization and magnetization, makes that phosphorus content is lower than 0.2% in the ore, produces iron ore concentrate after magnetic separation.
Above-mentioned phosphorous rhombohedral iron ore is levigate respectively to 100 orders, and its chemical ingredients (weight percent) sees Table 1.
The phosphorous rhombohedral iron ore results of elemental analyses of table 1
Embodiment 1
Get phosphorous ground hematite 1kg (being crushed to 100 orders) and be crushed to 10 purpose rice straw powder 200g and mix, mix with 10g dephosphorization additive (the dephosphorization additive is selected ammonium sulfate for use) again, the material that mixes is placed in the Reaktionsofen, roasting 2h under 400 ℃ of conditions, after the roasting, be cooled to below 80 ℃, the gained calcining adopts wet magnetic separation, obtain grade and be 61% iron ore concentrate, the rate of recovery is 72%; Phosphorus content is 0.15% in the iron ore concentrate.
Embodiment 2
Getting phosphorous ground hematite 1kg (being crushed to 100 orders) mixes with being crushed to 10 purpose wheat straw 100g and being crushed to 10 purpose corn stalk 100g, mix with 10g sulfuric acid (dephosphorization additive) again, the material that mixes is placed in the Reaktionsofen, roasting 1h under 550 ℃ of conditions, after the roasting, be cooled to below 80 ℃, the gained calcining adopts wet magnetic separation, obtain grade and be 62% iron ore concentrate, the rate of recovery is 75%; Phosphorus content is 0.10% in the iron ore concentrate.
Embodiment 3
Get phosphorous ground hematite 1kg (being crushed to 100 orders) with the wood sawdust that is crushed to 20 order 100g and be crushed to 20 purpose 100g corn stalk and mix, mix with 10g hydrochloric acid (dephosphorization additive) again, the material that mixes is placed in the Reaktionsofen, roasting 1h under 550 ℃ of conditions, after the roasting, be cooled to below 80 ℃, the gained calcining adopts wet magnetic separation, obtain grade and be 65% iron ore concentrate, the rate of recovery is 85%.Phosphorus content is 0.10% in the iron ore concentrate.
Claims (6)
1. a phosphorous rhombohedral iron ore dephosphorization and prepare the method for iron ore concentrate is characterized in that this method steps is as follows:
(1), gets phosphorous rhombohedral iron ore breeze and biomass material powder with phosphorous rhombohedral iron ore and biomass material separated pulverizing;
(2) take by weighing phosphorous rhombohedral iron ore breeze, biomass material powder and dephosphorization additive and mix compound, wherein each weight of material is such as down: phosphorous rhombohedral iron ore breeze: biomass material powder: dephosphorization additive=100: 10～30: 0.5～3;
(3) compound is carried out roasting, maturing temperature is 400～600 ℃, and in the roasting process, phosphorous rhombohedral iron ore is reduced magnetization and dephosphorization, after the roasting, is cooled to below 80 ℃ and obtains calcining;
(4) the gained calcining obtains iron ore concentrate through magnetic separation.
2. a kind of phosphorous rhombohedral iron ore dephosphorization according to claim 1 and prepare the method for iron ore concentrate is characterized in that phosphorous rhombohedral iron ore is selected iron level＞35% for use described in the step (1), the phosphorous rhombohedral iron ore of phosphorus content＜8%.
3. a kind of phosphorous rhombohedral iron ore according to claim 1 prepares the method for iron ore concentrate, it is characterized in that biomass material described in the step (1) is selected from least a in rice straw, wheat straw, corn stalk, bagasse, wood sawdust, abandoned mine wood, firewood, cogongrass and the cassava rattan.
4. a kind of phosphorous rhombohedral iron ore dephosphorization according to claim 1 and prepare the method for iron ore concentrate is characterized in that phosphorous ground hematite is broken to below 100 orders described in the step (1); Described biomass material is crushed to below 10 orders.
5. a kind of phosphorous rhombohedral iron ore dephosphorization according to claim 1 and prepare the method for iron ore concentrate is characterized in that, dephosphorization additive described in the step (2) is selected from any one or the two or more combinations in ammonium sulfate, ammonium chloride, sulfuric acid, the hydrochloric acid.
6. a kind of phosphorous rhombohedral iron ore dephosphorization according to claim 1 and prepare the method for iron ore concentrate is characterized in that the time of roasting described in the step (3) is 0.5～3h.
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| CN 200910242408 CN102094115B (en) | 2009-12-10 | 2009-12-10 | Method for dephosphorizing phosphorus-containing hematite and preparing iron ore concentrate by using phosphorus-containing hematite |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102242257A (en) * | 2011-06-30 | 2011-11-16 | 中南大学 | Flue gas circulation and biomass energy combined iron ore sintering method |
| CN103276198A (en) * | 2013-06-13 | 2013-09-04 | 陕西延长石油矿业有限责任公司 | Acid leaching technology for eroding silicon, preserving iron and removing phosphorus in high phosphorus oolitic hematite |
| KR101630986B1 (en) | 2014-12-19 | 2016-06-16 | 주식회사 포스코 | Method of manufacturing low phosphor reduced iron using high phosphor iron ore |
| CN105907946A (en) * | 2016-06-03 | 2016-08-31 | 江苏省冶金设计院有限公司 | Method and system for preparing iron concentrate powder from high phosphorous iron ores |
| CN110172569A (en) * | 2019-07-02 | 2019-08-27 | 东北大学 | The method of iron ore concentrate is produced using agricultural crop straw as reducing agent suspending magnetization roasting |
| CN111876593A (en) * | 2020-09-01 | 2020-11-03 | 中南大学 | Method for separating iron and removing phosphorus from high-phosphorus oolitic hematite |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101487068B (en) * | 2009-03-03 | 2011-01-05 | 北京科技大学 | Technological process for directly producing spongy iron from high-phosphor oolitic hematite |
| CN101570820B (en) * | 2009-06-16 | 2011-05-04 | 陈建湘 | Method for rapidly reducing and roasting as well as synchronously dephosphorizing and extracting iron at high temperature of high-silicon high-phosphorus iron ore |
-
2009
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102242257A (en) * | 2011-06-30 | 2011-11-16 | 中南大学 | Flue gas circulation and biomass energy combined iron ore sintering method |
| CN103276198A (en) * | 2013-06-13 | 2013-09-04 | 陕西延长石油矿业有限责任公司 | Acid leaching technology for eroding silicon, preserving iron and removing phosphorus in high phosphorus oolitic hematite |
| CN103276198B (en) * | 2013-06-13 | 2014-09-24 | 陕西延长石油矿业有限责任公司 | Acid leaching technology for eroding silicon, preserving iron and removing phosphorus in high phosphorus oolitic hematite |
| KR101630986B1 (en) | 2014-12-19 | 2016-06-16 | 주식회사 포스코 | Method of manufacturing low phosphor reduced iron using high phosphor iron ore |
| CN105907946A (en) * | 2016-06-03 | 2016-08-31 | 江苏省冶金设计院有限公司 | Method and system for preparing iron concentrate powder from high phosphorous iron ores |
| CN110172569A (en) * | 2019-07-02 | 2019-08-27 | 东北大学 | The method of iron ore concentrate is produced using agricultural crop straw as reducing agent suspending magnetization roasting |
| CN111876593A (en) * | 2020-09-01 | 2020-11-03 | 中南大学 | Method for separating iron and removing phosphorus from high-phosphorus oolitic hematite |
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| CN102094115B (en) | 2013-07-03 |
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