CN113151668A - Refractory iron ore powder for suspension magnetizing roasting and preparation method and application thereof - Google Patents
Refractory iron ore powder for suspension magnetizing roasting and preparation method and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/005—Pretreatment specially adapted for magnetic separation
- B03C1/015—Pretreatment specially adapted for magnetic separation by chemical treatment imparting magnetic properties to the material to be separated, e.g. roasting, reduction, oxidation
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Abstract
Refractory iron ore powder for suspension magnetizing roasting and its preparation process and application, and belongs to the field of mineral processing technology. The method adopts two sections of high-pressure roller mills connected in series to carry out dry milling to obtain refractory iron ore powder for suspension magnetizing roasting. And (3) performing suspension magnetization roasting on the qualified refractory iron ore powder raw material for suspension magnetization roasting in a reducing gas atmosphere, and grinding and magnetically separating the roasted product to obtain iron ore concentrate. The suspension roasting material prepared by the method forms more micro-cracks in the grain boundary of the ore, weakens the strength of the ore and improves the reaction rate in the suspension magnetizing roasting process. Meanwhile, before the product of the two-section series high-pressure roller grinding dry powder process is fed into the suspension magnetization roasting system, dehydration and drying operations are not needed, the test flow is simplified, and the production cost is reduced.
Description
Technical Field
The invention belongs to the technical field of mineral processing, and particularly relates to refractory iron ore powder for suspension magnetizing roasting, and a preparation method and application thereof.
Background
Aiming at the problem of low development and utilization efficiency of complex refractory iron ores in China, a plurality of scholars carry out technical attack. The 'preheating-regenerative reduction-reoxidation' multistage suspension magnetization roasting process (patent: CN106868292A) forms a complete set of core technologies and equipment for suspension state control of heterogeneous ore particles, regenerative efficient low-temperature reduction, precise control of iron phases in a cooling process, synchronous recovery of waste heat and the like, builds a kiloton-level complex refractory iron ore suspension magnetization roasting-efficient separation semi-industrial test platform, and realizes industrial application (reference: new development of fluidized magnetization roasting research of refractory iron ore). However, the method faces the problem of complex raw material preparation process, and the materials prepared by grinding need to be filtered and dried before entering the suspension magnetization roasting system, which further increases the enterprise cost. Therefore, it is desirable to provide an acceptable raw material for suspension magnetization firing to solve such problems.
At present, qualified raw materials are prepared by a crusher and a ball mill and then sorted, for example, patent CN105268532A relates to a combined crushing and grinding process, the invention provides a fine crushing-screening-grinding process to prepare raw materials suitable for sorting, the grinding granularity is reduced, and a large amount of microcracks are generated. However, the method realizes material crushing through traditional ore grinding, still has the problems of high energy consumption, low ore grinding efficiency and the like, and patent CN102085491A proposes a four-section crushing and twice-screening high-pressure roller mill crushing process, wherein raw ore is subjected to coarse crushing and intermediate crushing and then is screened, products on a screen are subjected to fine crushing operation, and products under the screen are subjected to high-pressure roller milling. The process reduces the crushing energy consumption to a certain extent and improves the production capacity of the mill. But has the disadvantages of complex flow and unstable index of the crushed product. Therefore, a new method for preparing qualified raw materials by suspension magnetizing roasting, which has short flow and low energy consumption, needs to be researched and developed urgently.
Disclosure of Invention
Aiming at the defects of the prior crushing technology, the invention mainly aims to overcome the problems of complex crushing process flow, high energy consumption, low ore grinding efficiency and the like, and provides refractory iron ore powder for suspension magnetizing roasting and a preparation method and application thereof.
The invention adopts two-section series high-pressure roller mill dry powder preparation for refractory iron ore, the prepared refractory iron ore powder is used for suspension magnetization roasting, and the specific refractory iron ore adopts two-section series high-pressure roller mill dry powder preparation, which takes the finely crushed refractory iron ore in a dressing mill as a raw material and adopts two-section series high-pressure roller mill for dry powder preparation, thus obtaining the qualified refractory iron ore powder raw material for suspension magnetization roasting. And (3) carrying out suspension magnetization roasting on the qualified refractory iron ore powder raw material in a reducing gas atmosphere, and grinding and magnetically separating a roasted product to obtain iron ore concentrate. The suspension roasting material prepared by the method forms more micro-cracks in the grain boundary of the ore, weakens the strength of the ore and improves the reaction rate in the suspension magnetizing roasting process. Meanwhile, before the product of the two-section series high-pressure roller grinding dry powder process is fed into the suspension magnetization roasting system, dehydration and drying operations are not needed, the test flow is simplified, and the production cost is reduced.
A preparation method of refractory iron ore powder for suspension magnetizing roasting comprises the following steps:
(1) carrying out first-stage crushing on the fine-crushed refractory iron ore by using a first-stage high-pressure roller mill, screening a first-stage crushed product by using a first-stage vibrating screen, and continuously returning the first-stage screened product to the first-stage high-pressure roller mill for crushing;
the fine-crushed refractory iron ore comprises the following elements in percentage by mass: 35-55% of TFe and SiO2 30～60％，Al2O30.5-5%, CaO 1-8%, MgO 3-5%, and the balance of oxygen and other impurity components; the granularity of the fine refractory iron ore is within 12 mm.
(2) The product under the first-stage screen enters a second-stage high-pressure roller mill for second-stage crushing, the product after the second-stage crushing is screened by a second-stage vibrating screen, and the product on the second-stage screen continuously returns to the second-stage high-pressure roller mill for crushing; the second-stage undersize product is refractory iron ore powder for suspension magnetizing roasting.
In the step (1), the fine crushing of the refractory iron ore is to obtain the fine crushed refractory iron ore by coarse crushing, intermediate crushing and fine crushing of the refractory iron ore.
In the step (1), the sieve holes of the first section of vibrating sieve are as follows: 4-6 mm, and the vibration frequency is 15 Hz.
In the step (1), the roller pressure of the first-section high-pressure roller mill is 20-30 MPa, and the rotating speed of a pressing roller is 20-25 rpm.
In the step (2), the particle size of the product under the first-stage sieve is at least less than 6 mm.
In the step (2), the roller pressure of the two-section high-pressure roller mill is 15-20 MPa, the rotating speed of a compression roller is 10-15 rpm, and the roller spacing is 2-4 mm.
In the step (2), the sieve pores of the second section of vibrating sieve are as follows: 1mm or 0.5 mm.
Refractory iron ore powder for suspension magnetizing roasting is prepared by the preparation method; the granularity of the iron ore powder is within 1mm or within 0.5mm, and compared with the conventional crushing technology, the specific surface area of the refractory iron ore powder is improved by 30-50%, so that the density of microcracks in the mineral is high, and the reaction rate of the suspension magnetization roasting can be obviously enhanced.
The invention relates to application of refractory iron ore powder for suspension magnetization roasting, in particular to the application of refractory iron ore powder for suspension magnetization roasting, which comprises the following steps:
adding the refractory iron ore powder for suspension magnetization roasting into a suspension magnetization roasting system for suspension magnetization roasting to obtain a suspension magnetization roasted product.
In the method, the suspension magnetization roasting temperature is 500-600 ℃, and the reduction time is 10-30 min.
In the method, the reducing gases adopted by the suspension magnetization roasting are CO and N2The volume percentage of CO in the mixed gas is 25-40%, and the balance is N2(ii) a The apparent flow velocity of the reducing gas fed into the reduction chamber is 0.3 to 0.7 m/s.
And (3) performing wet weak magnetic separation on the suspension roasted product to obtain magnetic concentrate and tailings.
In the method, the magnetic field intensity of wet type weak magnetic separation is 80-120 kA/m, the TFe content in the obtained magnetic separation concentrate is not less than 45%, and the recovery rate is not less than 85%.
The invention relates to refractory iron ore powder for suspension magnetization roasting and a preparation method and application thereof, and the basic principle is as follows:
the high-pressure roller mill has the advantages of low unit energy consumption, large processing capacity, uniform crushed products, small occupied area and the like, and gradually becomes the development trend of a multi-crushing and multi-grinding technology. The high-pressure roller mill performs quasi-static pressure layer crushing, and the particles can be used as pressure transmission media. When the material layer is extruded, the particles are crushed or deformed due to the huge pressure generated by mutual extrusion of the particles, and the selective crushing effect is obvious. The internal microcracks in the high-pressure roller mill product are developed more fully, and when the materials are subjected to reduction roasting in the suspension magnetization roasting system, the reducing gas is fully contacted with the minerals, so that the reaction rate of the magnetization roasting is improved. In addition, the product of the high-pressure roller mill has uniform particle size distribution, so that the mass and heat transfer of materials in the suspension magnetization roasting system is rapid, the gas-solid contact efficiency is high, the particles are uniformly heated, and the reaction effect of the suspension magnetization roasting is further enhanced.
Compared with the prior art, the invention has the advantages that: (1) the invention adopts a two-section high-pressure roller grinding dry powder making technology, does not need wet grinding, omits the procedures of filtering, drying and the like, simplifies the grinding process, and can directly prepare qualified raw materials for a suspension magnetization roasting system; (2) based on the technical principle of high-pressure roller milling lamination crushing, microcracks in the crushed product are fully developed, reducing gas is fully contacted with ores in the suspension magnetization roasting process, the reaction rate of magnetization roasting is improved, and the suspension magnetization roasting effect is further enhanced.
Drawings
FIG. 1 is a schematic process flow diagram of a method for carrying out two-stage series high-pressure roller mill dry-type pulverization on refractory iron ore and for suspension magnetization roasting.
Detailed Description
The present invention is described in further detail below with reference to a process flow diagram, which is schematically illustrated in fig. 1, and examples, which are provided to aid understanding of the present invention and should not be construed as specifically limiting the present invention.
Example 1
A method for carrying out two-stage series high-pressure roller mill dry-type powder making-for suspension magnetization roasting on refractory iron ore comprises the following steps:
carrying out coarse crushing, intermediate crushing and fine crushing on the refractory iron ore, wherein the particle size of the refractory iron ore after the coarse crushing is 50-75mm, the particle size of the refractory iron ore after the intermediate crushing is 30-50mm, and the particle size of the obtained fine crushed refractory iron ore is within 12 mm;
the used fine-grained refractory iron ore comprises the following components in percentage by mass: TFe 39.02%, FeO 11.16%, SiO2 37.22％，Al2O32.19 percent, CaO 1.93 percent, MgO 3.13 percent, P0.014 percent, S0.82 percent, and the balance of oxygen and other impurity components;
feeding the finely-crushed refractory iron ore into a first-section high-pressure roller mill for crushing, wherein the roller pressure of the first-section high-pressure roller mill is 20MPa, and the rotating speed of a compression roller is 20 rpm; the granularity of the first-stage high-pressure roller grinding product is-6 mm; enabling the first-stage crushed product to pass through a first-stage vibrating screen with the vibration frequency of 15Hz, returning the first-stage oversize product to the first-stage high-pressure roller mill for continuous crushing, and feeding the first-stage undersize product to a second-stage high-pressure roller mill for crushing; the roller pressure of the two-stage high-pressure roller mill is 15MPa, the rotating speed of a compression roller is 20rpm, and the roller spacing is 4 mm.
Screening the second-stage crushed product after the second-stage high-pressure roller mill by a 1mm second-stage vibrating screen, returning the second-stage oversize product to the second-stage high-pressure roller mill for continuous crushing, wherein the second-stage undersize product is qualified suspension magnetization roasting system raw material;
feeding the qualified raw materials of the suspension magnetization roasting system after the two sections of high-pressure roller grinding into a suspension magnetization roasting furnace, and introducing reducing gas for suspension magnetization roasting; reducing the gas to CO and N2The volume percentage of CO is 30 percent, and the balance is N2The apparent flow velocity of the gas is 0.50 m/s; the suspension magnetization roasting temperature is 500 ℃, and the reduction time is 20 min;
and cooling the product after suspension roasting, and feeding the product into a wet weak magnetic separator for separation, wherein the magnetic field intensity is 80kA/m, the TFe grade in the obtained magnetic concentrate is 65.02 percent, and the recovery rate is 86.72 percent.
Example 2
A method for two-stage series high-pressure roller mill dry-type pulverization of refractory iron ore for suspension magnetizing roasting comprises the following components TFe 47.37%, FeO 15.23%, and SiO2 33.22％，Al2O31.639%, CaO 1.17%, MgO 3.54%, P0.10%, S0.53%, the balance being oxygen and other impurity components;
the method is the same as example 1, except that:
(1) the granularity of the first-stage high-pressure roller grinding product is-4 mm; the grain size of the adopted section of vibrating screen is 4 mm.
(2) In the suspension magnetizing roasting, the volume percentage of CO in introduced reducing gas is 25 percent, and the balance is N2The gas apparent flow velocity is 0.3 m/s; the reduction temperature is 550 ℃, and the reduction time is 15 min.
(3) The magnetic field intensity of the wet type weak magnetic separation is 100kA/m, the TFe grade in the magnetic concentrate is 67.23%, and the recovery rate is 89.35%.
Example 3
A method for two-stage series high-pressure roller mill dry-type pulverization of refractory iron ore for suspension magnetizing roasting comprises using TFe 51.7%, FeO 21.35%, and SiO in percentage by mass2 30.22％，Al2O31.75 percent of CaO, 3.95 percent of MgO, 3.03 percent of P, 0.08 percent of S, and the balance of oxygen and other impurity components; the granularity of the fine-crushed refractory iron ore is-5 mm;
the method is the same as example 1, except that:
(1) in the suspension magnetizing roasting, the volume percentage of CO in introduced reducing gas is 35 percent, and the balance is N2The gas apparent flow velocity is 0.6 m/s; the reduction temperature is 520 ℃, and the reduction time is 30 min.
(2) The magnetic field intensity of wet type weak magnetic separation is 120kA/m, the TFe grade in the magnetic concentrate is 67.56%, and the recovery rate is 90.85%.
Comparative example 1
The finely divided refractory iron ore of example 1 was used;
feeding the finely-crushed refractory iron ore into a first-stage high-pressure roller mill for crushing, enabling a first-stage crushed product to pass through a 4mm first-stage vibrating screen, enabling a first-stage oversize product to return to the first-stage high-pressure roller mill for continuous crushing, feeding a first-stage undersize product into an overflow type ball mill for ore grinding operation, wherein the ore grinding time is 10min, and the ore grinding concentration is 70%; filtering and drying the ground ore product, and feeding the ground ore product into a suspension magnetization roasting system;
feeding the ground ore product into a suspension magnetization roasting furnace, and introducing reducing gas to perform suspension magnetization roasting; reducing the gas to CO and N2The volume percentage of CO is 30 percent, and the balance is N2The apparent flow velocity of the gas is 0.50 m/s; the reduction temperature is 500 ℃, and the reduction time is 20 min;
cooling the reduction product, feeding the reduction product into a wet weak magnetic separator for separation, wherein the magnetic field intensity is 80kA/m, the TFe grade in the obtained magnetic concentrate is 62.75 percent, and the recovery rate is 84.43 percent; the combination of the first-stage high-pressure roller milling and the ball milling is adopted, compared with the two-stage high-pressure roller milling, the ore dissociation is insufficient, so that the grade of the magnetic concentrate is low, and the ball-milled ore product needs to be filtered and dried before being fed into a suspension magnetization roasting system, so that the process is relatively complex.
Comparative example 2
The finely divided refractory iron ore of example 1 was used;
feeding the finely-crushed refractory iron ore into a first-section high-pressure roller mill for crushing, enabling a first-section crushed product to pass through a 6mm first-section vibrating screen, enabling a first-section oversize product to return to the first-section high-pressure roller mill for continuous crushing, and feeding a first-section undersize product into a horizontal roller mill for crushing; screening the horizontal roller mill product through a 1mm second-stage vibrating screen, returning a second-stage oversize product to the horizontal roller mill for continuous crushing, wherein the second-stage oversize product is a qualified suspension magnetization roasting system raw material;
feeding the product of the horizontal roller mill into a suspension magnetization roasting furnace, and introducing reducing gas for suspension magnetization roasting; reducing the gas to CO and N2The volume percentage of CO is 30 percent, and the balance is N2The apparent flow velocity of the gas is 0.50 m/s; the reduction temperature is 500 ℃, and the reduction time is 20 min;
cooling the reduction product, feeding the reduction product into a wet weak magnetic separator for separation, wherein the magnetic field intensity is 80kA/m, the TFe grade in the obtained magnetic concentrate is 63.74 percent, and the recovery rate is 85.06 percent; the combination of the first-section high-pressure roller mill and the horizontal roller mill is adopted, compared with the two-section high-pressure roller mill, the single dissociation degree of the crushed product is slightly low, the grade of the magnetic concentrate is influenced, the horizontal roller mill occupies a larger area, and the high-pressure roller mill occupies a smaller area.
Claims (10)
1. The preparation method of the refractory iron ore powder for suspension magnetizing roasting is characterized by comprising the following steps of:
(1) carrying out first-stage crushing on the fine-crushed refractory iron ore by using a first-stage high-pressure roller mill, screening a first-stage crushed product by using a first-stage vibrating screen, and continuously returning the first-stage screened product to the first-stage high-pressure roller mill for crushing;
the fine-crushed refractory iron ore comprises the following elements in percentage by mass: 35-55% of TFe and SiO230～60％，Al2O30.5-5%, CaO 1-8%, MgO 3-5%, and the balance of oxygen and other impurity components; the granularity of the fine-crushed refractory iron ore is within 12 mm;
(2) the product under the first-stage screen enters a second-stage high-pressure roller mill for second-stage crushing, the product after the second-stage crushing is screened by a second-stage vibrating screen, and the product on the second-stage screen continuously returns to the second-stage high-pressure roller mill for crushing; the second-stage undersize product is refractory iron ore powder for suspension magnetizing roasting.
2. The method for preparing refractory iron ore powder for suspension magnetizing roasting according to claim 1, wherein in the step (1), the mesh of the first vibrating screen is: 4-6 mm, and the vibration frequency is 15 Hz.
3. The method for preparing refractory iron ore powder for suspension magnetization roasting according to claim 1, wherein in the step (1), the roller pressure of the first-stage high-pressure roller mill is 20-30 MPa, and the rotation speed of the pressing roller is 20-25 rpm.
4. The method for preparing the refractory iron ore powder for suspension magnetization roasting according to claim 1, wherein in the step (2), the roller pressure of the two-stage high-pressure roller mill is 15-20 MPa, the rotation speed of a pressing roller is 10-15 rpm, and the roller spacing is 2-4 mm.
5. The method for preparing refractory iron ore powder for suspension magnetic roasting according to claim 1, wherein in the step (2), the mesh of the second-stage vibrating screen is as follows: 1mm or 0.5 mm.
6. Refractory iron ore powder for suspension magnetizing roasting, which is characterized by being prepared by the preparation method of any one of claims 1 to 5; the granularity of the iron ore powder is within 1mm or within 0.5mm, and compared with the conventional crushing technology, the specific surface area of the refractory iron ore powder is improved by 30-50%.
7. The use of the refractory iron ore powder for suspension magnetic roasting according to claim 6, wherein the refractory iron ore powder for suspension magnetic roasting is applied to suspension magnetic roasting, and the specific method comprises the following steps:
adding the refractory iron ore powder for suspension magnetization roasting into a suspension magnetization roasting system for suspension magnetization roasting to obtain a suspension magnetization roasted product.
8. The application of the refractory iron ore powder for suspension magnetization roasting according to claim 7, wherein the suspension magnetization roasting temperature is 500-600 ℃, and the reduction time is 10-30 min.
9. Use of refractory iron ore powder for suspension magnetizing roasting according to claim 7, characterized in that the suspension magnetizing roasting is usedThe reducing gases used are CO and N2The volume percentage of CO in the mixed gas is 25-40%, and the balance is N2(ii) a The apparent flow velocity of the reducing gas fed into the reduction chamber is 0.3 to 0.7 m/s.
10. The application of the refractory iron ore powder for suspension magnetization roasting according to claim 7, wherein the product after suspension roasting is subjected to wet weak magnetic separation to obtain magnetic concentrate and tailings; the magnetic field intensity of wet type weak magnetic separation is 80-120 kA/m, the TFe content in the obtained magnetic separation concentrate is not less than 45%, and the recovery rate is not less than 85%.
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