Process method for purifying and removing impurities from quartz sand

Abstract

The invention relates to the technical field of quartz sand, in particular to a quartz sand purification and impurity removal process method which comprises the following steps: S1, performing mechanical crushing treatment on a quartz stone raw material; s2, performing calcination and water quenching treatment on the crushed quartz stone; s3, carrying out sand making and ore grinding treatment on the crushed quartz; s4, performing magnetic separation treatment on the quartz sand; s5, performing multi-stage screening treatment on the quartz sand; s6, quartz sand is subjected to flotation treatment; s7, performing water quenching treatment on the quartz sand; s8, performing multi-stage screening treatment on the quartz sand; s9, quartz sand is subjected to acid leaching treatment; and S10, performing high-temperature chlorination treatment on the quartz sand. The air curtain machine is arranged under the magnetic roller on the right portion of the belt magnetic separator, in the magnetic separation process, the air curtain machine works to generate air blowing to the magnetic roller, the air can be blown to magnetic minerals on the conveying belt, and therefore quartz sand attached to the magnetic minerals is blown to the right portion of the inverted-V-shaped plate and then falls into the quartz sand collecting frame to be collected.

Description

Technical Field

[0001] This application relates to the technical field of quartz sand, and particularly relates to a process method for purifying and removing impurities from quartz sand. Background Art

[0002] During the preparation of quartz sand, it is necessary to purify and remove impurities from the quartz sand. Currently, a belt magnetic separator is usually used to remove magnetic minerals in the quartz sand. However, fine-grained quartz sand may adhere to the surface of magnetic powder due to static electricity, moisture or surface tension. During the magnetic separation process, this adhered quartz sand will be carried away together with the magnetic powder, resulting in an unsatisfactory separation effect. Summary of the Invention

[0003] In order to overcome the defect that when using a belt magnetic separator to purify fine-grained quartz sand, the quartz sand adheres to the magnetic powder due to static electricity, moisture or surface tension and is thus carried away together during the magnetic separation process, affecting the separation effect, the present invention provides a process method for purifying and removing impurities from quartz sand.

[0004] Technical Solution: A process method for purifying and removing impurities from quartz sand includes the following steps: S1. The quartz stone raw material is subjected to mechanical crushing treatment; S2. The crushed quartz stone is calcined and water-quenched; S3. The crushed quartz is subjected to sand making and grinding treatment; S4. The quartz sand is subjected to magnetic separation treatment; S5. The quartz sand is subjected to multi-stage screening treatment; S6. The quartz sand is subjected to flotation treatment; S7. The quartz sand is subjected to water quenching treatment; S8. The quartz sand is subjected to multi-stage screening treatment; S9. The quartz sand is subjected to acid leaching treatment; S10. The quartz sand is subjected to high-temperature chlorination treatment.

[0005] A magnetic separation device for purifying and removing impurities from quartz sand, which is used for magnetic separation treatment of quartz sand in S4 of the above method, includes a belt magnetic separator and an inverted V-shaped plate; the rotating roller at the right end of the belt magnetic separator is a magnetic roller, and the belt magnetic separator is used to adsorb magnetic minerals in the quartz sand; an inverted V-shaped plate is fixedly connected to the belt magnetic separator; it further includes an air curtain machine; the air curtain machine is fixedly connected to the inverted V-shaped plate, and the air curtain machine is located directly below the magnetic roller at the right end of the belt magnetic separator.

[0006] In addition, particularly preferably, intercepting plates are provided on both the front and back sides of the conveyor belt of the belt magnetic separator and on both the front and back sides of the inverted V-shaped plate.

[0007] In addition, particularly preferably, a wear-resistant coating is provided on the back of the air curtain machine.

[0008] In addition, it is particularly preferred that a baffle is further included; the baffle is fixedly connected to the belt type magnetic separator.

[0009] In addition, it is particularly preferred that the upper part of the baffle is provided as a pointed part.

[0010] In addition, it is particularly preferred that an electromagnetic plate I is further included; the electromagnetic plate I is fixedly connected to the right part of the inverted V-shaped plate.

[0011] In addition, it is particularly preferred that an electromagnetic plate II is further included; the electromagnetic plate II is fixedly connected to the left part of the inverted V-shaped plate.

[0012] In addition, it is particularly preferred that a guide plate is further included; the guide plate is fixedly connected to the left part of the inverted V-shaped plate.

[0013] In addition, it is particularly preferred that an inverted V-shaped frame is further included; the inverted V-shaped frame is fixedly connected to the lower side of the inverted V-shaped plate.

[0014] Compared with the prior art, the present invention has the following advantages: 1. The present invention is provided with an air curtain machine directly below the magnetic roller on the right part of the belt type magnetic separator. During the magnetic separation process, the air curtain machine is made to work to generate wind blowing towards the magnetic roller. The wind will blow towards the magnetic minerals on the conveyor belt, thereby blowing the quartz sand adhering to the magnetic minerals onto the right part of the inverted V-shaped plate and then falling into the quartz sand collection frame for collection.

[0015] 2. The present invention is provided with an electromagnetic plate II on the left part of the inverted V-shaped plate. When the magnetic minerals slide down on the left part of the inverted V-shaped plate, they will pass through the electromagnetic plate II. Before that, the electromagnetic plate II is electrified to generate weak magnetism. In this way, strong magnetic minerals (such as magnetite) will be adsorbed, while weak magnetic minerals (such as ilmenite) will fall due to insufficient magnetic force. After the quartz sand magnetic separation is completed, the magnetic mineral collection frame is removed and another magnetic mineral collection frame is placed. Then, the electromagnetic plate II is powered off to lose its magnetism. In this way, the strong magnetic minerals will slide down along the left part of the inverted V-shaped plate into the magnetic mineral collection frame for collection, thus completing the separation of magnetic minerals.

[0016] 3. When the electromagnetic plate I and the electromagnetic plate II are working, they will generate a large amount of heat, causing the air near the heat dissipation ports of the electromagnetic plate I and the electromagnetic plate II to heat up. The air intake port of the air curtain machine will inhale this hot air when sucking air, so that the wind blown by the air curtain machine carries heat, that is, the hot wind blows towards the magnetic minerals on the conveyor belt, which helps to evaporate the moisture on the surfaces of the quartz sand and the magnetic minerals, reduce the adhesion force caused by moisture, and the hot wind can also reduce the static charge on the particle surface and reduce the electrostatic adsorption. In this way, even under low wind force, the air curtain machine can smoothly blow the quartz sand adhering to the magnetic minerals onto the right part of the inverted V-shaped plate, thereby reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the quartz sand purification and impurity removal magnetic separation equipment of the present invention; Figure 2 Schematic three-dimensional structure diagram of the baffle and electromagnetic plate I of the magnetic separation device for purifying and removing impurities from quartz sand according to the present invention; Figure 3 Schematic three-dimensional structure diagram of the guide plate of the magnetic separation device for purifying and removing impurities from quartz sand according to the present invention; Figure 4 Schematic three-dimensional structure diagram of the electromagnetic plate II of the magnetic separation device for purifying and removing impurities from quartz sand according to the present invention; Figure 5 Schematic cross-sectional view of the three-dimensional structure of the inverted V-shaped frame of the magnetic separation device for purifying and removing impurities from quartz sand according to the present invention; Figure 6 Front view of the baffle, electromagnetic plate I, electromagnetic plate II, guide plate, and inverted V-shaped frame of the magnetic separation device for purifying and removing impurities from quartz sand according to the present invention.

[0018] In the figure: 1 - belt magnetic separator, 2 - inverted V-shaped plate, 3 - air curtain machine, 4 - baffle, 5 - electromagnetic plate I, 21 - electromagnetic plate II, 22 - guide plate, 23 - inverted V-shaped frame. Detailed implementation manners

[0019] Although the present invention may be described with respect to specific applications or industries, those skilled in the art will recognize the broader applicability of the present invention. Those of ordinary skill in the art will recognize that terms such as: above, below, upward, downward, etc. are used to describe the drawings and do not represent limitations on the scope of the present invention as defined by the appended claims. Any numerical labels such as: first or second are merely illustrative and are not intended to limit the scope of the present invention in any way.

[0020] Embodiment 1 A process method for purifying and removing impurities from quartz sand, characterized in that it includes the following steps: S1: Mechanically crush the quartz sand raw material, import the quartz sand raw material into a quartz jaw crusher for crushing, and perform secondary crushing on the generated larger stones to control the ore particle size between 5 cm and 10 cm.

[0021] S2: Import the ore fragments into a calcination tube furnace, perform high-temperature calcination at 800 °C in the calcination furnace for 30 min to 40 min, and then drop them into a water pool for high-temperature water quenching treatment. By utilizing the different temperatures at which different minerals undergo crystal deformation at high temperatures, crystal deformation will generate gaps, so as to achieve the purpose of monomer dissociation of quartz and impurities.

[0022] S3: Classify and process the calcined and water-quenched quartz fragments according to different colors, and send the classified quartz fragments into a pulse sand making machine to completely peel the quartz sand from the surface of the impurities, and control the crushed particles between 4 mm and 8 mm.

[0023] S4: Magnetic separation treatment of quartz sand fragments. The crushed quartz sand particles are introduced into the magnetic separation equipment to remove the magnetic minerals in the quartz sand particles, thereby improving the purity and whiteness of the quartz sand.

[0024] S5: Multi-stage screening treatment of quartz sand. The heat-treated quartz sand particles are introduced into the screening machine. There are three groups of filter screens arranged from top to bottom in the screening machine. The aperture of the top filter screen is controlled at 9 mm - 10 mm, the aperture of the middle filter screen is controlled at 4 mm - 8 mm, and the aperture of the bottom screen is controlled at 1 mm - 3 mm. The large particle stones in the quartz sand can be separated by using the top filter screen, and the qualified quartz sand can be screened by using the middle filter screen. Finally, the small particle quartz sand is screened and selected through the bottom filter screen.

[0025] S6: Flotation treatment of quartz sand. The magnetically separated quartz sand particles are introduced into the flotation machine, and flotation is carried out by the method of fluorine quartz sand flotation. Hydrofluoric acid is used as the feldspar activator, and sulfuric acid is used as the regulator, so that under the strong acidic condition with the pH controlled at 2 - 3, cationic collectors such as octadecylamine are used to pre-adsorb the activated feldspar and then separate it.

[0026] S7: After the flotation quartz sand is de-drugged and dried, it is sent to a high-temperature calcination furnace for high-temperature calcination for 40 minutes, and the temperature is set at 1000 °C. Immediately after calcination, it is quenched with cold deionized water. In this way, the deformation force generated by the thermal and cold changes can expose the gas-liquid and solid inclusions in the quartz, thereby improving the impurity removal rate of the quartz sand.

[0027] S8: The particle size of the quenched quartz sand becomes smaller, so it is necessary to perform screening treatment again, multi-stage screening treatment of quartz sand. The treated quartz sand particles are introduced into the screening machine. There are three groups of filter screens arranged from top to bottom in the screening machine. The aperture of the top filter screen is controlled at 9 mm - 10 mm, the aperture of the middle filter screen is controlled at 4 mm - 8 mm, and the aperture of the bottom screen is controlled at 1 mm - 3 mm. The large particle stones in the quartz sand can be separated by using the top filter screen, and the qualified quartz sand can be screened by using the middle filter screen. Finally, the small particle quartz sand is screened and selected through the bottom filter screen.

[0028] S9: Acid leaching treatment of quartz sand. The flotation quartz sand is introduced into the acid leaching equipment. The acid leaching solution selects hydrochloric acid, sulfuric acid, nitric acid, acetic acid and hydrofluoric acid. Concentrated sulfuric acid, aqua regia and hydrofluoric acid with stronger acidity can be selected according to needs for the removal of Cr and Ti. The acid leaching temperature is 70 °C, the acid leaching time is 6 h, the oxalic acid concentration is 10 g / L, the HCl concentration is 5%, and the liquid-solid ratio is 2:5. The stirring speed is controlled at 800 rpm for acid leaching.

[0029] S10: The quartz sand is treated by high-temperature chlorination, which can effectively migrate the impurity elements contained in the quartz sand lattice to the surface of the sand and remove them. The quartz sand is heated, and the acid-leached quartz sand particles are subjected to high-temperature calcination treatment. The calcination temperature is controlled at 1100°C - 1200°C. While high-temperature calcination, a chlorinating agent is added, that is, the chlorination roasting method is used for quartz purification. By using the chlorination reaction of metal oxides with the chlorinating agent in a high-temperature environment, gaseous metal chlorides are generated and volatilized, thereby achieving the purpose of removing metal oxide impurities. The chlorinating agent is selected as a solid chlorinating agent, and the solid chlorinating agent includes NaCl, CaCl2, and NH4Cl.

[0030] A magnetic separation device for purifying and removing impurities from quartz sand is used for magnetic separation of quartz sand in S4 of the above method. As Figures 1-6 shown, it includes a belt magnetic separator 1 and an inverted V-shaped plate 2; the rotating roller at the right end of the belt magnetic separator 1 is a magnetic roller; an inverted V-shaped plate 2 is welded to the lower right side of the belt magnetic separator 1; it also includes an air curtain machine 3; the air curtain machine 3 is fixedly connected to the inverted V-shaped plate 2, and the air curtain machine 3 is located directly below the magnetic roller at the right end of the belt magnetic separator 1.

[0031] In order to prevent the quartz sand from falling, intercepting plates are provided on both the front and back sides of the conveyor belt of the belt magnetic separator 1 and on both the front and back sides of the inverted V-shaped plate 2.

[0032] In order to prevent magnetic minerals from damaging the air curtain machine 3, a wear-resistant coating is provided on the back of the air curtain machine 3.

[0033] It also includes a baffle 4; the baffle 4 is welded to the right part of the belt magnetic separator 1.

[0034] In order to prevent the quartz sand from accumulating, the upper part of the baffle 4 is set to be a pointed part.

[0035] It also includes an electromagnetic plate 1 5; the electromagnetic plate 1 5 is fixedly connected to the right part of the inverted V-shaped plate 2.

[0036] During use, a vibrating feeder is arranged directly above the left end of the belt magnetic separator 1. A magnetic mineral collection box is placed directly below the left end of the inverted V-shaped plate 2 in advance, and a quartz sand collection box is placed directly below the right end of the inverted V-shaped plate 2. Then, quartz sand is poured into the vibrating feeder, and the vibrating feeder is controlled to work to evenly feed the quartz sand. The quartz sand falls onto the electric conveyor belt of the belt magnetic separator 1, and then through the operation of the electric conveyor belt, the quartz sand is continuously conveyed to the right. After being conveyed to the end, the quartz sand falls on the right part of the inverted V-shaped plate 2 and then falls into the quartz sand collection box for collection. The rotating roller at the right end of the electric conveyor belt is a magnetic roller, and the magnetic minerals in the quartz sand will be adsorbed by the magnetic roller on the conveyor belt. The magnetic minerals will move with the conveyor belt to below the magnetic roller, so as to be separated from the quartz sand. When the magnetic minerals move to the left of the magnetic roller and are not affected by its magnetism, the magnetic minerals fall on the left part of the inverted V-shaped plate 2 due to gravity and then fall into the magnetic mineral collection box for collection. In this way, the separation and removal of magnetic minerals in the quartz sand are completed.

[0037] During the magnetic separation process, fine-grained quartz sand may adhere to the surface of magnetic minerals due to static electricity, moisture or surface tension. These adhered quartz sands will be carried away together with the magnetic minerals, resulting in incomplete separation. Therefore, an air curtain machine 3 is arranged directly below the magnetic roller on the right part of the belt magnetic separator 1. During the magnetic separation process, the air curtain machine 3 is made to work to generate wind blowing towards the magnetic roller. The wind will blow towards the magnetic minerals on the conveyor belt, so as to blow the quartz sand adhered to the magnetic minerals onto the right part of the inverted V-shaped plate 2 and then fall into the quartz sand collection box for collection.

[0038] A baffle 4 is arranged to the right of the air curtain machine 3. The baffle 4 can block the wind generated by the air curtain machine 3 from blowing towards the quartz sand falling from the electric conveyor belt, so as to avoid generating dust.

[0039] When the wind generated by the air curtain machine 3 blows the quartz sand adhered to the magnetic minerals onto the right part of the inverted V-shaped plate 2, some of the magnetic minerals with weak adhesion may be blown off together, resulting in magnetic minerals being mixed in the quartz sand. Therefore, an electromagnetic plate 1 5 is arranged on the right part of the inverted V-shaped plate 2. The blown magnetic minerals and quartz sand will be blocked by the baffle 4. After being blocked, the magnetic minerals and quartz sand will fall onto the electromagnetic plate 1 5 together. During magnetic separation, the electromagnetic plate 1 5 is electrified to keep it magnetic, so as to adsorb the magnetic minerals. After the quartz sand magnetic separation is completed, the quartz sand collection box is transferred, and then a magnetic mineral collection box is placed directly below the right end of the inverted V-shaped plate 2. Then, the electromagnetic plate 1 5 is powered off to lose its magnetism. In this way, the magnetic minerals slide down along the inverted V-shaped plate 2 into the magnetic mineral collection box for collection, so as to remove the magnetic minerals.

[0040] Example 2 On the basis of Example 1, as Figures 1-6 shown, it further includes an electromagnetic plate 2 21. The electromagnetic plate 2 21 is fixedly connected to the left part of the inverted V-shaped plate 2.

[0041] It also includes a guiding plate 22; the guiding plate 22 is welded to the left part of the inverted V-shaped plate 2.

[0042] It also includes an inverted V-shaped frame 23; the inverted V-shaped frame 23 is welded to the lower side of the inverted V-shaped plate 2.

[0043] Different magnetic minerals have different economic values. Through magnetic re-separation, these minerals can be separately recovered to achieve the maximum utilization of resources. For example, strongly magnetic minerals (such as magnetite) can be used in the iron and steel industry; weakly magnetic minerals (such as ilmenite) can be used to extract titanium metal. Therefore, an electromagnetic plate two 21 is arranged on the left part of the inverted V-shaped plate 2. When the magnetic minerals slide down the left part of the inverted V-shaped plate 2, they will pass by the electromagnetic plate two 21. Before that, the electromagnetic plate two 21 is powered on to generate weak magnetism. In this way, strongly magnetic minerals (such as magnetite) will be adsorbed, while weakly magnetic minerals (such as ilmenite) will fall due to insufficient magnetic force. After the magnetic separation of quartz sand is completed, the magnetic mineral collection frame is removed and another magnetic mineral collection frame is placed. Then, the electromagnetic plate two 21 is powered off to lose its magnetism. In this way, the strongly magnetic minerals will slide down along the left part of the inverted V-shaped plate 2 into the magnetic mineral collection frame for collection, thus completing the separation of magnetic minerals. In order to ensure that all magnetic minerals can pass by the electromagnetic plate two 21 when sliding down (to improve the separation effect), a guiding plate 22 is arranged on the left part of the inverted V-shaped plate 2. Under the combined action of the guiding plate 22 and the left part of the inverted V-shaped plate 2, the magnetic minerals will surely pass by the electromagnetic plate two 21, thereby improving the separation effect.

[0044] When the electromagnetic plate one 5 and the electromagnetic plate two 21 are working, they will generate a large amount of heat, causing the air near the heat dissipation openings of the electromagnetic plate one 5 and the electromagnetic plate two 21 to heat up. When the suction port of the air curtain machine 3 sucks in air, it will inhale this hot air, so that the air blown out by the air curtain machine 3 has heat, that is, the hot air blows towards the magnetic minerals on the conveyor belt, which helps to evaporate the moisture on the surfaces of the quartz sand and the magnetic minerals, reduce the adhesion force caused by moisture, and the hot air can also reduce the static charge on the particle surface and reduce electrostatic adsorption. In this way, even under low wind force, the air curtain machine 3 can smoothly blow the quartz sand adhered to the magnetic minerals onto the right part of the inverted V-shaped plate 2, thereby reducing energy consumption. In addition, an inverted V-shaped frame 23 is arranged on the lower side of the inverted V-shaped plate 2. The inverted V-shaped plate 2 and the inverted V-shaped frame 23 together form an inverted V-shaped channel. The suction port of the air curtain machine 3 will suck in air through the inverted V-shaped channel, and the heat dissipation openings of the electromagnetic plate one 5 and the electromagnetic plate two 21 are located in the inverted V-shaped channel. In this way, the air curtain machine 3 sucks in most of the hot air near the heat dissipation openings of the electromagnetic plate one 5 and the electromagnetic plate two 21, increasing the heat of the air blown out by the air curtain machine 3 and further ensuring that the quartz sand adhered to the magnetic minerals is blown off.

[0045] It also includes an inverted V-shaped frame 23; the inverted V-shaped frame 23 is fixedly connected to the lower side of the inverted V-shaped plate 2.

[0046] Although the present invention has been described with reference to exemplary embodiments, it should be understood that the present invention is not limited to the disclosed exemplary embodiments. The scope of the following claims should be given the broadest interpretation so as to cover all modifications and equivalent structures and functions.

Claims

1. A process method for purifying and removing impurities from quartz sand, characterized in that it includes The following steps: S1. The quartz stone raw material is mechanically crushed; S2. The crushed quartz stone is calcined and water quenched; S3. The crushed quartz is processed by sand making and grinding; S4. The quartz sand is subjected to magnetic separation; S5. The quartz sand is subjected to multi-stage screening; S6. The quartz sand is subjected to flotation; S7. The quartz sand is water quenched; S8. The quartz sand is subjected to multi-stage screening; S9. The quartz sand is acid leached; S10. The quartz sand is subjected to high-temperature chlorination.

2. A quartz sand purification and impurity removal magnetic separation device for magnetic separation treatment of quartz sand in S4 of claim 1, comprising a belt magnetic separator (1) and an inverted V-shaped plate (2); the rotating roller at the right end of the belt magnetic separator (1) is a magnetic roller, and the belt magnetic separator (1) is used to adsorb magnetic minerals in the quartz sand; an inverted V-shaped plate (2) is fixedly connected to the belt magnetic separator (1); the characteristics are that, It also includes an air curtain machine (3); the air curtain machine (3) is fixedly connected to the inverted V-shaped plate (2), and the air curtain machine (3) is directly below the magnetic roller at the right end of the belt magnetic separator (1).

3. A magnetic separation device for purifying and removing impurities from quartz sand according to claim 2, characterized in that, Intercepting plates are arranged on both the front and back sides of the conveyor belt of the belt magnetic separator (1) and on both the front and back sides of the inverted V-shaped plate (2).

4. A magnetic separation device for purifying and removing impurities from quartz sand according to claim 2, characterized in that, A wear-resistant coating is provided on the back of the air curtain machine (3).

5. A quartz sand purification and impurity removal magnetic separation device according to claim 2, characterized in that, It also includes a baffle plate (4); the baffle plate (4) is fixedly connected to the belt magnetic separator (1).

6. A quartz sand purification and impurity removal magnetic separation device according to claim 4, characterized in that, The upper part of the baffle plate (4) is set to be a pointed part.

7. A magnetic separation device for purifying and removing impurities from quartz sand according to claim 4, characterized in that, It also includes an electromagnetic plate I (5); the electromagnetic plate I (5) is fixedly connected to the right part of the inverted V-shaped plate (2).

8. A magnetic separation device for purifying and removing impurities from quartz sand according to claim 6, characterized in that, It also includes an electromagnetic plate II (21); the electromagnetic plate II (21) is fixedly connected to the left part of the inverted V-shaped plate (2).

9. A magnetic separation device for purifying and removing impurities from quartz sand according to claim 7, characterized in that, It also includes a guide plate (22); the guide plate (22) is fixedly connected to the left part of the inverted V-shaped plate (2).

10. A magnetic separation device for purifying and removing impurities from quartz sand according to claim 8, characterized in that, It also includes an inverted V-shaped frame (23); the inverted V-shaped frame (23) is fixedly connected to the lower side of the inverted V-shaped plate (2).

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