CN217709617U

CN217709617U - Experimental suspended mineral phase conversion device

Info

Publication number: CN217709617U
Application number: CN202221000565.6U
Authority: CN
Inventors: 高鹏; 安亚雄; 余建文; 韩跃新; 袁帅
Original assignee: Northeastern University China
Current assignee: Northeastern University China
Priority date: 2022-04-28
Filing date: 2022-04-28
Publication date: 2022-11-01
Anticipated expiration: 2032-04-28

Abstract

The utility model provides an experimental suspended phase inversion device, which comprises a feeding system, a reaction system, a heating furnace, an air supply system, a gas component analyzer, a temperature sensor, a pressure sensor and the like; reaction system top is arranged in to charging system to be connected with reaction system through the flange, reaction system top-down includes granule settling chamber, reaction chamber and the partial pressure room that the inner chamber is linked together, be provided with temperature measurement mouth, pressure measurement mouth and gas outlet on the granule settling chamber lateral wall, be provided with the air distribution plate between reaction chamber and the partial pressure room, be provided with partial pressure room pressure measurement mouth on the partial pressure room lateral wall, be equipped with the air inlet partial pressure room bottom, air supply system is connected to the air inlet, the reaction chamber is arranged in the heating furnace. The utility model discloses the control of temperature and pressure in the accessible reaction chamber, the accurate regulation and control material is in the ore phase transformation process of gas-solid reaction in-process, can develop the ore phase transformation regulation and control mechanism research of mineral.

Description

Experimental suspended mineral phase conversion device

Technical Field

The utility model belongs to the technical field of mineral processing equipment, in particular to experiment type suspended state ore phase conversion device.

Background

The iron ore resource reserves in China are rich, but the iron ore resources in China have the characteristics of low grade and fine impurity, the symbiotic relationship is complex, the grain size is fine, the typical complex refractory iron ore resources such as oolitic hematite, siderite, limonite, micro-fine ore and the like have the storage amount of 200 hundred million tons, ideal economic and technical indexes are difficult to obtain by adopting the conventional ore dressing technology, and the suspension magnetizing roasting process is an effective method for treating the ores. The suspension magnetizing roasting technology meets the development target of the national steel industry, and has the advantages of energy conservation, emission reduction, technical transformation, backward elimination and independent innovation. The utilization rate of the refractory iron ores such as hematite, limonite and the like is very low in China. The development of a technology for efficiently utilizing refractory iron ores can reduce the dependence on the international iron ore market. The suspension roasting technology is widely applied in the alumina industry, and the successful application of the technology in the iron ore industry is comprehensively determined by reliable theory, test data, scientific roasting process conditions and reasonable process design. The suspension magnetizing roasting technology solves the technical problem of magnetizing roasting of refractory iron ores at home and abroad, and is a major breakthrough of the mineral separation technology of the refractory iron ores. The characteristics of low energy consumption, high efficiency and large processing capacity determine that the technology has strong competitiveness and wide application prospect.

A small-size suspension roasting device CN201910903016.6 is the first small-size suspension continuous roasting device in China, can simulate the technology production to a great extent, provide fine technical reference to the industrial debugging of suspension roasting device, but in the basic research work in laboratory, the index of test condition node can't accurate judgement of continuous roasting device, present roasting device mostly uses tubular shaft furnace as the main, the boiler tube adopts quartz tube more, the mass transfer heat transfer efficiency with the steel furnace chamber differs greatly, be difficult to carry out accurate the accuse to the critical point of mineral ore phase conversion, consequently need design experimental type suspension state mineral phase conversion device and be used for studying the conversion process of suspension state mineral phase.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art, the utility model aims to provide a simple structure, easily adjust, the experimental type suspended state ore phase conversion device of the operation of being convenient for, the device degree of automation is high, and safeguard measure is perfect, and the security is high, can regard as experimental type suspended state ore phase conversion device.

The utility model provides a technical scheme that its technical problem adopted is: an experimental suspended state mineral phase conversion device comprises a feeding system, a reaction system, a heating furnace and an air supply system; the feeding system is arranged above the reaction system and connected with the reaction system through a flange, the reaction system comprises a particle settling chamber, a reaction chamber and a pressure division chamber, wherein the inner cavities of the particle settling chamber, the reaction chamber and the pressure division chamber are communicated, a temperature measuring port, a pressure measuring port and an air outlet are formed in the side wall of the particle settling chamber, an air distribution plate is arranged between the reaction chamber and the pressure division chamber, a pressure division chamber pressure measuring port is formed in the side wall of the pressure division chamber, an air inlet is formed in the bottom of the pressure division chamber, the air inlet is connected with an air supply system, and the reaction chamber is arranged in the heating furnace.

Further, charging system includes feed hopper, filling tube, two spherical valves, the funnel bottom is connected with the filling tube with reaction system intercommunication, set up two spherical valves on the filling tube, two spherical valves include valve I, valve II.

Furthermore, the feeding system also comprises a quartz glass plate, the quartz glass plate is arranged at the bottom of the feeding pipe, the feeding pipe penetrates through the quartz glass plate and is communicated with the reaction system, and the feeding hopper, the feeding pipe, the double-spherical valve and the quartz glass plate are integrally designed; the quartz glass plate and the reaction system are sealed by flange extrusion. The quartz glass plate is used as an observation window for directly observing the sedimentation phenomenon of the materials in the particle sedimentation chamber and the surging state of the materials in the reaction chamber.

Further, a part of the particle settling chamber and a part of the pressure dividing chamber are also arranged in the heating furnace.

Furthermore, the temperature measuring port, the pressure measuring port and the gas outlet are arranged on the side wall of the upper part of the particle settling chamber, the temperature measuring port is connected with a temperature sensor, the pressure measuring port is connected with a first pressure sensor, and the gas outlet is connected with a first flow sensor and a gas component analyzer; the pressure measuring port of the pressure dividing chamber is arranged on the side wall of the lower part of the pressure dividing chamber, and the pressure measuring port of the pressure dividing chamber is connected to a second pressure sensor; and a second flow sensor is arranged on a connecting pipeline of the air inlet and the air supply system.

Furthermore, the heating furnace is provided with a ceramic fiber special-shaped hearth, the furnace body of the heating furnace is a rotatable furnace body, the rotation angle is 0-180 degrees, the heating furnace adopts an electric heating mode, the adjustable range is 0-1700 ℃, and the accuracy is +/-1 ℃.

Furthermore, the outer wall of the particle settling chamber is gradually contracted from top to bottom, and the included angle between the outer wall and the vertical direction is 5-15 degrees; the reaction chamber and the pressure dividing chamber are in a straight cylinder shape, and the air distribution plate is fixedly or detachably arranged between the reaction chamber and the pressure dividing chamber.

Furthermore, the air distribution plate is made of a porous high-temperature-resistant medium material, and the aperture is 0.15-1 mm.

Further, the gas supply system is used for providing single gas, or 2-3 gases are mixed according to any proportion and introduced into the reaction system.

Further, the mineral phase conversion device is suitable for mineral phase conversion experiment research of minerals such as iron minerals, rare earth, cyaniding tailings, iron-aluminum symbiotic resources, stone coal vanadium and the like.

The application method of the experimental suspended mineral phase conversion device comprises the following steps:

step 1: heating the reaction system to a preset temperature, and introducing safe gas (N) into the reaction system through a gas inlet₂) Discharging the air;

and 2, step: adding the materials into a feeding funnel, opening a valve I, closing the valve I when the materials completely pass through the valve I, opening a valve II, and closing the valve II when the materials completely enter a reaction system;

and 3, step 3: ensuring that a valve I and a valve II of the feeding system are in a closed state, introducing reducing gas into the reaction system, and starting timing;

and 4, step 4: stopping introducing the reducing gas after the reaction time is reached, and introducing a safety gas to evacuate the reducing gas;

and 5: opening a connecting flange between the feeding system and the reaction system, taking down the feeding system, and taking out the materials by rotating the furnace body of the heating furnace;

step 6: the charging system is reset.

Compared with the prior art, the utility model has the characteristics and beneficial effects that:

(1) The device has multiple protection measures such as high automation degree, overtemperature alarm and the like, high control precision, safety, reliability and simple operation, and the single processing capacity reaches 30-200 g;

(2) The feeding system in the device adopts the control of the double-spherical valve, realizes the feeding of reaction materials in the opposite air flow, and avoids the back-blowing action of the opposite air flow to the materials;

(3) The device has wide temperature adjusting range which can reach 1700 ℃ at most, and the whole reaction system is made of 310S stainless steel, so that the heat conducting speed is high;

(4) Suspension state ore phase conversion device is based on magnetization calcination basis, and the control of temperature and pressure in the accessible reaction chamber, the ore phase conversion process of accurate regulation and control material in the gas-solid reaction in-process, but wide application in the reducing atmosphere ore phase conversion, the oxidizing atmosphere ore phase conversion, the neutral atmosphere ore phase conversion of material. The temperature space of the mineral phase conversion device is large (0-1700 ℃), the application range is wider, and the research on mineral phase conversion regulation and control mechanisms of complex refractory iron minerals, rare earth, cyaniding tailings, iron-aluminum symbiotic resources, stone coal vanadium and other minerals can be developed.

(5) The utility model discloses the device can dispose various sensors according to the experimental demand, is convenient for observe the degree of going on of calcination reaction in real time, like temperature sensor, pressure sensor, flow sensor and gas composition analysis sensor etc..

Drawings

FIG. 1 is a schematic diagram of an experimental suspended phase inversion apparatus according to an embodiment;

FIG. 2 is a top view of the experimental suspended phase inversion apparatus of the example;

FIG. 3 is a structural view of an air distribution plate of the apparatus of the embodiment;

FIG. 4 is an XRD analysis of a sample of the example;

FIG. 5 is the XRD analysis chart of the product at each stage of the raw ore and suspension magnetizing roasting-magnetic separation process in the example;

1. the feeding funnel, 2, valve I, 3, valve II, 4, pressure measurement port, 5, temperature measurement port, 6, gas outlet, 7, particle settling chamber, 8, reaction chamber, 9, heating furnace hearth, 10, heating furnace, 11, air distribution plate, 12, partial pressure chamber pressure measurement port, 13, partial pressure chamber, 14, air inlet, 15 and observation window.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Examples

As shown in fig. 1, 2 and 3, the utility model provides an experimental suspended phase inversion device, which comprises a feeding system, a reaction system, a heating furnace 10 and a gas supply system; reaction system top is arranged in to charging system to be connected through flange and reaction system, the reaction system material is 310S stainless steel, and top-down includes granule settling chamber 7, reacting chamber 8 and partial pressure chamber 13 that the inner chamber is linked together, be provided with temperature measurement mouth 5, pressure measurement mouth 4 and gas outlet 6 on the granule settling chamber lateral wall, be provided with air distribution plate 11 between reacting chamber and the partial pressure chamber, be provided with partial pressure chamber pressure measurement mouth 12 on the partial pressure chamber lateral wall, the partial pressure chamber bottom is equipped with air inlet 14, air feed system is connected to the air inlet, reacting chamber and partial granule settling chamber, partial pressure chamber are arranged in heating furnace 9.

The feeding system comprises a feeding hopper 1, a feeding pipe, a double-spherical valve and a quartz glass plate, wherein the bottom of the hopper is connected with the feeding pipe communicated with the reaction system, the double-spherical valve is arranged on the feeding pipe and comprises a valve I2 and a valve II3, and the valves are made of quartz ground glass and are good in air tightness, high-temperature resistant and not prone to deformation; the quartz glass plate is arranged at the bottom of the feeding pipe, the feeding pipe penetrates through the quartz glass plate and is communicated with the reaction system, and the feeding hopper, the feeding pipe, the double-spherical valve and the quartz glass plate are integrally designed; the quartz glass plate and the reaction system are sealed by flange extrusion (flange type sealing and high temperature resistant rubber pad are adopted). The quartz glass plate is used as an observation window 15 for directly observing the sedimentation phenomenon of the materials in the particle sedimentation chamber and the surging state of the materials in the reaction chamber.

The temperature measuring port, the pressure measuring port and the gas outlet are arranged on the side wall of the upper part of the particle settling chamber, the temperature measuring port is connected with a temperature sensor, the pressure measuring port is connected with a first pressure sensor and is respectively used for measuring the temperature and the gas pressure above the particle settling chamber, and the gas outlet is connected with a first flow sensor and a gas component analysis sensor; the pressure measuring port of the pressure dividing chamber is arranged on the side wall of the lower part of the pressure dividing chamber, and the pressure measuring port of the pressure dividing chamber is connected to a second pressure sensor to measure the air pressure of the pressure dividing chamber; and a second flow sensor is arranged on a connecting pipeline of the air inlet and the air supply system.

The heating furnace is provided with a ceramic fiber special-shaped furnace body, is sealed in a stepped manner, is limited integrally, and is not easy to deform and move, the furnace body of the heating furnace is a rotatable furnace body, the rotating angle is 0-180 degrees, the heating furnace adopts an electric heating mode, a heating element is a 1900 type silicon-molybdenum rod, the temperature field is uniform, the energy consumption is low, the adjustable range is 0-1700 ℃, and the accuracy is +/-1 ℃.

The outer wall of the particle settling chamber is gradually contracted from top to bottom, and the included angle between the outer wall and the vertical direction is 10 degrees, so that the materials can be settled and fall into the reaction chamber conveniently; the reaction chamber and the pressure dividing chamber are in a straight cylinder shape, and the air distribution plate is detachably arranged between the reaction chamber and the pressure dividing chamber.

Wherein the air distribution plate is a porous high-temperature-resistant asbestos mesh with the aperture of 0.15-1 mm.

Wherein, the gas supply system can be used for mixing two gases according to any proportion and introducing the two gases into the reaction system.

the sample of this example used mixed magnetic concentrate with a fineness of 87% at-0.074 mm, and the results of the analysis of the chemical components of the sample are shown in Table 1;

TABLE 1 chemical composition analysis of mineral sample (mass fraction,%)

As can be seen from table 1: the iron grade of the sample is 35.6%, the main impurities are silicon dioxide with the content of 38.70%, the harmful impurities are P and S, and the content of the harmful impurities is 0.02% and 0.03%, respectively.

Step 1: firstly, starting a heating furnace to heat a reaction system, heating the reaction system to a preset temperature of 560 ℃, opening a gas outlet 6, enabling a gas supply system to enter nitrogen gas into a pressure division chamber 13 from a gas inlet 14, enabling the gas in the pressure division chamber 13 to enter a reaction chamber 8 through a wind distribution plate 11, and emptying the reaction chamber 8;

step 2: after air is exhausted, opening a valve I2, adding 50g of reaction materials into a feeding funnel 1, after the materials completely pass through the valve I2, closing the valve I, opening a valve II3, after the materials completely pass through the valve II, closing the valve II, and enabling the reaction materials to enter a settling chamber and finally enter a reaction chamber;

and step 3: by controlling the gas supply system, 30% CO (CO 300ml/min, N)₂700 ml/min) enters the pressure dividing chamber 13 from the air inlet 14, the gas in the pressure dividing chamber 13 enters the reaction chamber 8 through the air distribution plate 11, and the timing is started; the gas forms a plurality of air flows after passing through the air distribution plate, so that the materials in the reaction chamber are in a suspension state, gas-solid reduction reaction occurs, and the sedimentation phenomenon of the materials in the particle sedimentation chamber and the surging state of the materials in the reaction chamber can be observed through the observation window of the quartz glass plate.

Step four: after reacting for 15min, regulating the concentration of CO by controlling the gas supply system to be 0, keeping the total gas amount unchanged, evacuating the gas in the reaction chamber, opening a connecting flange between the feeding system and the reaction system, taking down the feeding system, and rotating the reaction system by 120 degrees to take out the materials;

step five: and (4) restoring the reaction system to the original position, installing a feeding system, closing the gas supply system and all gas circuit switches, and closing the power supply to finish the reaction.

The chemical component analysis results of the samples subjected to magnetic separation after roasting by the device are shown in table 2;

TABLE 2 chemical composition analysis table of sample after baking

As can be seen from the table 2, the iron grade of the concentrate after roasting is improved by 28.7 percent compared with the iron grade before roasting, the recovery rate is improved by 18.26 percent, and the concentrate can be used as a high-quality raw material for iron making.

Based on the experimental suspended state ore phase conversion device and the using method, different roasting conditions are tested:

the raw material used in the test was a high-iron bauxite in indonesia, the chemical multi-element analysis results of the raw ore are shown in table 3, and the mineral composition of the high-iron bauxite sample was analyzed by X-ray diffraction (XRD) and the results are shown in fig. 4.

TABLE 3 Multi-element analysis of raw ore chemistry

Roasting conditions are as follows: the reduction roasting temperature is 600 ℃, the total gas flow is 500mL/min, the roasting time is 20min, the CO concentration is 20%, the suspension magnetization roasting test is carried out, and the low-intensity magnetic separation is carried out under the condition that the magnetic field intensity is 133.6kA/min, so that the aluminum concentrate with the aluminum oxide content of 68.55% and the iron removal rate of 65.63% can be obtained.

The phase analysis of the raw ore, the roasted product and the sorted product was performed by XRD, respectively, and the result is shown in fig. 5. As can be seen from fig. 5, the magnetite and quartz crystal minerals are predominant in the fired product, while the gibbsite phase in the raw ore disappears and exists in the fired product in the form of amorphous Al2O 3. The main mineral phase in the magnetic concentrate is magnetite, and the main amorphous Al2O3 and a certain amount of quartz exist in the aluminum concentrate. XRD analysis results show that effective separation of aluminum minerals and iron minerals is realized through roasting-magnetic separation, and the iron mineral content in the aluminum concentrate product is greatly reduced.

Above technical scheme has explained the utility model discloses a technical thought can not prescribe a limit to with this the utility model discloses a protection scope, everything does not break away from the utility model discloses technical scheme's content, the foundation the utility model discloses a technical entity all belongs to the protection scope of the utility model technical scheme to any change and the decoration of above technical scheme institute.

Claims

1. The utility model provides an experimental type suspended state ore phase conversion equipment which characterized in that: comprises a feeding system, a reaction system, a heating furnace and a gas supply system; reaction system top is arranged in to charging system to be connected with reaction system through the flange, reaction system top-down includes granule settling chamber, reaction chamber and the partial pressure room that the inner chamber is linked together, be provided with temperature measurement mouth, pressure measurement mouth and gas outlet on the granule settling chamber lateral wall, be provided with the air distribution plate between reaction chamber and the partial pressure room, be provided with partial pressure room pressure measurement mouth on the partial pressure room lateral wall, be equipped with the air inlet partial pressure room bottom, air supply system is connected to the air inlet, the reaction chamber is arranged in the heating furnace.

2. The experimental suspended state mineral phase transformation device according to claim 1, characterized in that: the feeding system comprises a feeding hopper, a feeding pipe and a double-spherical valve, wherein the bottom of the hopper is connected with the feeding pipe communicated with the reaction system, the feeding pipe is provided with the double-spherical valve, and the double-spherical valve comprises a valve I and a valve II.

3. The experimental suspended state mineral phase transformation device according to claim 2, characterized in that: the feeding system also comprises a quartz glass plate, the quartz glass plate is arranged at the bottom of the feeding pipe, the feeding pipe penetrates through the quartz glass plate to be communicated with the reaction system, and the feeding hopper, the feeding pipe, the double-spherical valve and the quartz glass plate are integrally designed; the quartz glass plate and the reaction system are sealed by flange extrusion.

4. The experimental suspended state mineral phase transformation device according to claim 1, characterized in that: the temperature measuring port, the pressure measuring port and the gas outlet are arranged on the side wall of the upper part of the particle settling chamber, the temperature measuring port is connected with a temperature sensor, the pressure measuring port is connected with a first pressure sensor, and the gas outlet is connected with a first flow sensor and a gas component analysis sensor; the pressure measuring port of the pressure dividing chamber is arranged on the side wall of the lower part of the pressure dividing chamber, and the pressure measuring port of the pressure dividing chamber is connected to a second pressure sensor; and a second flow sensor is arranged on a connecting pipeline of the air inlet and the air supply system.

5. The experimental suspended state mineral phase transformation device according to claim 1, characterized in that: the heating furnace is provided with a ceramic fiber special-shaped hearth, the furnace body of the heating furnace is a rotatable furnace body, the rotation angle is 0-180 degrees, the heating furnace adopts an electric heating mode, the adjustable range is 0-1700 ℃, and the precision is +/-1 ℃; part of the particle settling chamber and part of the pressure dividing chamber are also arranged in the heating furnace.

6. The experimental suspended state mineral phase transformation device according to claim 1, characterized in that: the outer wall of the particle settling chamber is gradually contracted from top to bottom, and the included angle between the outer wall and the vertical direction is 5-15 degrees; the reaction chamber and the pressure dividing chamber are in a straight cylinder shape, and the air distribution plate is fixedly or detachably arranged between the reaction chamber and the pressure dividing chamber.

7. The experimental suspended state mineral phase transformation device according to claim 1, characterized in that: the air distribution plate is made of a porous high-temperature-resistant medium material, and the aperture is 0.15-1 mm.

8. The experimental suspended state mineral phase transformation device according to claim 1, characterized in that: the mineral phase conversion device is suitable for the experimental research of mineral phase conversion of iron minerals, rare earth, cyanidation tailings, iron-aluminum symbiotic resources and stone coal vanadium minerals.