CN104451124A - Method for iron increase and dephosphorization of low-grade high-phosphorus oolitic hematite - Google Patents
Method for iron increase and dephosphorization of low-grade high-phosphorus oolitic hematite Download PDFInfo
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Abstract
The invention relates to a method for iron increase and dephosphorization of low-grade high-phosphorus oolitic hematite. The method comprises the following steps: (1) grinding low-grade high-phosphorus oolitic hematite and carrying out high-gradient magnetic separation and discarding tailings at a magnetic field strength of 9,000-10,000 gausses to obtain iron concentrate; (2) preparing the iron concentrate into pellets by using anthracite as a reducing agent, at an ore blending ratio of (1.5:1)-(1:1), carrying out magnetic roasting at 800-850 DEG C to obtain roasted ore and then cooling with water; (3) crushing and grinding the cooled roasted ore, adding oleic acid and stirring, wherein the addition of oleic acid is 1-1.2Kg/t; and (4) sorting the treated ore slurry at a magnetic field strength of 800-850 gausses to obtain the high-grade iron concentrate. The iron increase and dephosphorization are performed by the method comprising the steps of tailing discharging, magnetic roasting, rapid cooling and selective flocculation and magnetic separation. By treating low-grade high-phosphorus oolitic hematite with the method disclosed by the invention, low-cost and high-grade concentrate can be produced and used as a smelting raw material for an electric furnace.
Description
Technical field
The invention belongs to technical field of beneficiation, be specifically related to a kind of method of low-grade Gao Lin Caviar shape rhombohedral iron ore dephosphorus iron extraction.
Background technology
Oolitic hematite accounts for 1/9 of China's iron ore, and reserves are quite abundant, and domestic high-quality iron ore resource is closely exhausted, current iron ore deposit height dependence on import, therefore develops difficult Xuan Caviar shape rhombohedral iron ore and is conducive to economic Sustainable development.
Oolitic hematite is marine deposit rock and ore, and gangue and ore are concentric(al) circles distribution, and ore mainly exists with the form of roe shape, beans shape and the kidney shape, but disseminated grain size is thin, adopts during conventional beneficiation method process high-phosphor oolitic hematite and there is following problem:
(1) resource utilization is low, and a large amount of particulate iron mineral is lost to mine tailing;
(2) poor product quality, iron ore concentrate phosphorus content is too high affects subsequent smelting operation;
(3) technique, medicament do not mate, and cause flow process complicated, the low inferior significant technology issues of the efficiency of separation.
Summary of the invention
The object of this invention is to provide a kind of method of low-grade Gao Lin Caviar shape rhombohedral iron ore dephosphorus iron extraction, the method can improve the rate of recovery and the grade of magnetite.
Technical scheme of the present invention is: a kind of method of low-grade Gao Lin Caviar shape rhombohedral iron ore dephosphorus iron extraction, comprises the steps:
(1) by after low-grade Gao Lin Caviar shape rhombohedral iron ore ore grinding, carry out high-gradient magnetic separation throwing tail in magneticstrength 9000 ~ 10000 Gauss and obtain iron ore concentrate;
(2) iron ore concentrate is made pelletizing, adopt hard coal to make reductive agent, join ore deposit than being 1.5:1 ~ 1:1, magnetizing roasting at 800 ~ 850 DEG C, obtains roasted ore, then water-cooled;
(3) will add oleic acid after cooled roasted ore comminution and stir, oleic acid add-on be 1 ~ 1.2Kg/t;
(4) ore pulp of above-mentioned process is carried out sorting in magneticstrength 800 ~ 850 Gauss, obtain high grade iron concentrate.
Described low-grade Gao Lin Caviar shape rhombohedral iron ore ferrous grade 21 ~ 46 %, phosphorous 0.1 ~ 0.4%.
After step (1) ore grinding, fineness is preferably-200 orders and accounts for 90%.
The pelletizing diameter preferably about 12mm that step (2) is made.
Step (3) preferably comminution to-200 orders accounts for 90%
For the Ore performance of low-grade Gao Lin Caviar shape rhombohedral iron ore, the present invention adopts the method for throwing tail-magnetizing roasting-cooling-selective flocculation magnetic separation fast in advance to carry out carrying iron dephosphorization.You Yu Caviar shape rhombohedral iron ore head grade is low, and gangue is many, and raw ore is through magnetizing roasting with after cooling fast, and magnetite crystal grain is difficult to crystal growth, also may generate ferrosilicon peridotites, be unfavorable for sorting.Test shows, sorting after the direct magnetizing roasting of raw ore, iron concentrate grade is only 56%, therefore first to adopt and throw tail enriched iron concentrate in advance, reduce gangue mineral to magnetizing roasting and the quick impact cooled, because grinding particle size is thin during magnetic separation, adopt selective flocculation magnetic separation, magnetite is reunited, thus farthest improves the rate of recovery and the grade of magnetite.Adopt the inventive method process low-grade Gao Lin Caviar shape rhombohedral iron ore, low cost can be produced, raw materials for metallurgy that high-grade concentrate is used as electric furnace.
Accompanying drawing explanation
Accompanying drawing 1 is present invention process schema.
Embodiment
The inventive method process low-grade Gao Lin Caviar shape rhombohedral iron ore is adopted to carry out dephosphorus iron extraction flow process as follows: (1), after comminution, utilizes high gradient magnetic separator to throw tail to Di grade Caviar shape rhombohedral iron ore, improves the grade of iron ore; (2) iron ore concentrate after sorting is made pelletizing back magnetization roasting, rhombohedral iron ore is converted into magnetite, roasted ore adopts water-cooled, can accelerate the migration of magnet iron crystal grain and assemble, facilitate being separated of iron crystal grain and phosphorus; (3) add oleic acid solutions by after roasted ore comminution, promote that the flocculation of fine magnetite crystal grain is grown up; (4) use weak magnetic separator magnetic separation, obtain qualified iron ore concentrate.
The inventive method be applicable to process ferrous grade lower than 46 %, phosphorous rate higher than 0.1% low-grade Gao Lin Caviar shape rhombohedral iron ore.
For low product position, Inner Mongol Caviar shape rhombohedral iron ore, raw ore ferrous grade is 21%, phosphorous 0.3%, and gangue is mainly based on silicate minerals.Concrete implementation step is as shown in Figure 1: comminution Hou Caviar shape hematite product fineness accounts for 90% for-200 orders, enters high-gradient magnetic separation, throws the grade of the iron ore concentrate that tail obtains and the rate of recovery is respectively 40.2%, 90% under 10000 Gausses through one section of sorting; Iron ore concentrate is made pelletizing (about 12mm), hard coal is adopted to make reductive agent, join ore deposit than being 1:1, at 850 DEG C, magnetizing roasting obtained roasted ore after 1 hour, roasted ore adopts cooling (water-cooled) fast, cooled roasted ore is milled to-200 orders and accounts for 90%, in agitator, add oleic acid (1Kg/t) stir 20min; Sorting under ore pulp weak magnetic separator 850 Gauss processed, the grade of available iron ore concentrate and the rate of recovery are respectively 63.5% and 75%, and phosphorous rate is only 0.1%.
For Guizhou Di Pin Wei Caviar shape rhombohedral iron ore, raw ore ferrous grade is 28%, phosphorous 0.36%, and gangue is mainly based on silicate minerals.Concrete implementation step: comminution Hou Caviar shape hematite product fineness accounts for 92% for-200 orders, enters high-gradient magnetic separation, throws the grade of the iron ore concentrate that tail obtains through one section of sorting under 9000 Gausses and the rate of recovery is respectively 50.3%, 92%; Iron ore concentrate is made pelletizing (about 12mm), hard coal is adopted to make reductive agent, join ore deposit than being 1.2:1, at 800 DEG C, magnetizing roasting obtained roasted ore after 1.5 hours, roasted ore adopts cooling (water-cooled) fast, cooled roasted ore is milled to-200 orders and accounts for 90%, in agitator, add oleic acid (1.2Kg/t) stir 30min; Select under ore pulp weak magnetic separator 800 Gauss processed, the grade of available iron ore concentrate and the rate of recovery are respectively 65% and 76.7%, and phosphorous rate is lower than 0.1%.
Claims (5)
1. a method for low-grade high phosphorus Caviar shape rhombohedral iron ore dephosphorus iron extraction, is characterized in that comprising the steps:
(1) by after low-grade Gao Lin Caviar shape rhombohedral iron ore ore grinding, carry out high-gradient magnetic separation throwing tail in magneticstrength 9000 ~ 10000 Gauss and obtain iron ore concentrate;
(2) iron ore concentrate is made pelletizing, adopt hard coal to make reductive agent, join ore deposit than being 1.5:1 ~ 1:1, magnetizing roasting at 800 ~ 850 DEG C, obtains roasted ore, then water-cooled;
(3) will add oleic acid after cooled roasted ore comminution and stir, oleic acid add-on be 1 ~ 1.2Kg/t;
(4) ore pulp of above-mentioned process is carried out sorting in magneticstrength 800 ~ 850 Gauss, obtain high grade iron concentrate.
2. the method for low-grade Gao Lin Caviar shape rhombohedral iron ore dephosphorus iron extraction according to claim 1, is characterized in that described low-grade Gao Lin Caviar shape rhombohedral iron ore ferrous grade 21 ~ 46 %, phosphorous 0.1 ~ 0.4%.
3. the method for low-grade Gao Lin Caviar shape rhombohedral iron ore dephosphorus iron extraction according to claim 1 and 2, after it is characterized in that step (1) ore grinding, fineness accounts for 90% for-200 orders.
4. the method for low-grade Gao Lin Caviar shape rhombohedral iron ore dephosphorus iron extraction according to claim 1 and 2, is characterized in that the pelletizing diameter that step (2) is made is about 12mm.
5. the method for low-grade Gao Lin Caviar shape rhombohedral iron ore dephosphorus iron extraction according to claim 1 and 2, is characterized in that step (3) comminution to-200 orders account for 90%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105907947A (en) * | 2016-06-03 | 2016-08-31 | 江苏省冶金设计院有限公司 | Method for preparing iron powder and system for preparing iron powder |
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