Method for purifying and dewatering sea silicon sand by high-speed centrifugal water injection

Abstract

This invention discloses a high-speed centrifugal water injection purification and dewatering method for marine silica sand. This invention relates to the field of silica sand purification technology and includes the following steps: activating the silica sand; sieving the activated silica sand to remove impurities; mechanically grinding the sieved silica sand; treating the ground silica sand with centrifugal water injection, using centrifugal force combined with water injection to remove chloride ions and harmful substances from the silica sand; and dewatering the treated silica sand to obtain finished silica sand. By combining activation treatment, mechanical grinding, and centrifugal water injection purification, chloride ions and impurities such as shells and mud can be effectively removed from the silica sand. This process adopts a step-by-step treatment method: first, activation loosens the colloids on the surface of the silica sand; then, mechanical grinding breaks down the colloidal layer structure; and finally, centrifugal force combined with water injection separates the soluble salts from the silica sand, achieving deep purification of the silica sand.

Description

Technical Field

[0001] This invention relates to the field of silica sand purification and treatment technology, specifically a high-speed centrifugal water injection purification and dehydration method for marine silica sand. Background Technology

[0002] Silica sand is a type of mineral particle with silicon dioxide as its main component, widely distributed in land mines and coastal areas. Marine silica sand refers to silica sand resources derived from marine environments and submerged in seawater for extended periods. It is characterized by large reserves and high particle roundness. However, due to its long-term exposure to seawater, the surface and internal pores of the silica sand particles adsorb a large amount of chloride ions, sulfate ions, and other salts, and it is also mixed with impurities such as shell fragments and mud.

[0003] In construction and industrial applications, the chloride ion content in silica sand is a critical control indicator. Excessive chloride ion content accelerates steel corrosion during concrete mixing, severely impacting the structural safety and service life of buildings. Sulfate ions, on the other hand, react with cement hydration products to form ettringite, causing concrete to expand and crack. Therefore, the Ministry of Construction of China clearly stipulates in its "Opinions on Strictly Managing Sea Sand Used in Construction" that sea sand used in construction projects must undergo special treatment to meet the prescribed chloride ion content standards.

[0004] In existing technologies, the desalination of marine silica sand mainly employs immersion rinsing, which involves prolonged soaking and rinsing with large amounts of fresh water to dissolve the salts in the silica sand using concentration differences. However, this method has significant shortcomings: firstly, immersion only removes soluble salts from the surface of the silica sand, failing to completely remove chloride ions adsorbed in the capillaries within the sand, resulting in inconsistent chloride ion content after treatment; secondly, immersion consumes a large amount of water, takes a long time, and has low production efficiency, making it difficult to meet the needs of continuous industrial production. Furthermore, existing equipment easily loses fine sand during the process, leading to resource waste, and lacks effective methods for treating the colloidal layer and impurities such as shells on the silica sand surface, resulting in inconsistent product quality.

[0005] To address the aforementioned problems, this invention provides a high-speed centrifugal water injection purification and dehydration method for marine silica sand and its dedicated equipment. The aim is to solve the technical problems of difficult removal of chloride ions inside silica sand, low treatment efficiency, and high water consumption in the prior art by combining activation treatment, mechanical grinding, and centrifugal water injection, thereby achieving efficient and deep purification of marine silica sand. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a high-speed centrifugal water injection purification and dehydration method for marine silica sand, which solves the technical problems mentioned in the background section.

[0007] To achieve the above objectives, the present invention provides a method for high-speed centrifugal water injection purification and dewatering of marine silica sand, comprising the following steps: Activation treatment of silica sand; The activated silica sand is sieved to remove impurities; The sieved silica sand is mechanically ground. The polished silica sand is treated by centrifugal water injection purification, which uses centrifugal force combined with water injection to remove chloride ions and harmful substances from inside the silica sand. The treated silica sand is dehydrated to obtain the finished silica sand.

[0008] In some embodiments, the activation treatment involves injecting water into the silica sand to allow the colloids on the surface of the silica sand to peel off naturally. Each batch is 1500-2500 cubic meters and no soaking is required.

[0009] In some embodiments, the screening step uses a sieve with a aperture of 0.4mm × 0.4mm for screening, and the screened mud, shells and gravel are recycled for the preparation of building materials or road construction materials.

[0010] In some embodiments, the mechanical grinding process employs a high-speed grinder to break the colloidal layer on the surface of the silica sand, round the sand grains, and crush any remaining shells.

[0011] In some embodiments, the centrifugal water purification step employs a two-stage treatment, including a first-stage coarse treatment and a second-stage fine treatment, to remove chloride ions and harmful substances from the silica sand step by step.

[0012] In some embodiments, the water used in the activation treatment step is recycled water recovered in subsequent steps.

[0013] In some embodiments, the finished silica sand contains ≤0.001% chloride ions and ≥99.85% silica.

[0014] In some embodiments, the method produces 150-200 cubic meters of finished sand per hour.

[0015] A high-speed centrifugal water injection purification and dewatering machine for silica sand includes: frame; The mixing tank is mounted on the frame, and a water tank is provided around the mixing tank. The mixing tank is also provided with a highly wear-resistant polyurethane mesh on its periphery. A centrifugal wheel is installed inside the mixing tank, and a spiral blade is provided on the periphery of the centrifugal wheel. The maximum diameter of the spiral blade is smaller than the inner diameter of the mixing tank. The feed hopper is located above the mixing tank, and its discharge port is directly opposite the centrifugal wheel; A water inlet pipe is connected to the inside of the mixing tank. The water inlet pipe extends from the outside of the mixing tank to the central cavity of the centrifugal wheel. A water outlet pipe extending horizontally outward is provided at its top end, with the water outlet facing the area between the centrifugal wheel and the mixing tank. The system includes a drive mechanism, comprising a first motor and a second motor. The first motor is connected to the feed hopper via a belt and drives the feed hopper to rotate. The second motor is connected to the centrifugal wheel and drives it to rotate.

[0016] In some embodiments, a discharge hopper is provided below the mixing tank for collecting the processed silica sand.

[0017] This invention provides a high-speed centrifugal water injection purification and dehydration method for marine silica sand. By combining activation treatment, mechanical grinding, and centrifugal water injection purification, this invention effectively removes chloride ions and impurities such as shells and mud from the silica sand. The process employs a step-by-step approach: first, activation loosens the colloids on the silica sand surface; then, mechanical grinding disrupts the colloidal layer structure; finally, centrifugal force combined with water injection separates the soluble salts from the interior of the silica sand, achieving deep purification. Compared to traditional soaking or simple washing methods, this invention eliminates the need for prolonged soaking, shortening the processing cycle. Simultaneously, the screened mud, shells, and other impurities can be recycled for use in building material production, achieving comprehensive resource utilization. Furthermore, the specialized equipment provided by this invention has a rational structural design. Through the coordination of components such as the centrifugal wheel, mixing tank, and water inlet pipe, continuous production can be achieved, with good operational stability, making it suitable for large-scale applications. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the process flow described in this invention.

[0019] Figure 2 This is a schematic diagram of the dehydrator structure described in this invention.

[0020] In the diagram: 1. Frame; 2. Mixing tank; 3. Centrifugal wheel; 31. Spiral blade; 4. Feed hopper; 51. First motor; 52. Second motor; 6. Water inlet pipe; 61. Water outlet pipe; 7. Water tank; 8. Discharge hopper. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figure 1-2This invention provides a technical solution: a method for high-speed centrifugal water injection purification and dehydration of marine silica sand, comprising the following steps: Activation treatment of silica sand; The activated silica sand is sieved to remove impurities; The sieved silica sand is mechanically ground. The polished silica sand is treated by centrifugal water injection purification, which uses centrifugal force combined with water injection to remove chloride ions and harmful substances from inside the silica sand. The treated silica sand is dehydrated to obtain the finished silica sand.

[0023] In some embodiments, the activation treatment involves injecting water into the silica sand to allow the colloids on the surface of the silica sand to peel off naturally. Each batch is 1500-2500 cubic meters and no soaking is required.

[0024] In some embodiments, the screening step uses a sieve with an aperture of 0.4 mm × 0.4 mm for screening, and the screened mud, shells and gravel are recycled for the preparation of building materials or road construction materials.

[0025] In some embodiments, the mechanical grinding process employs a high-speed grinder to break the colloidal layer on the surface of the silica sand, round the sand grains, and crush any remaining shells.

[0026] In some embodiments, the centrifugal water purification step employs a two-stage treatment, including a first-stage coarse treatment and a second-stage fine treatment, to remove chloride ions and harmful substances from the silica sand step by step.

[0027] In some embodiments, the water used in the activation treatment step is recycled water recovered in subsequent steps.

[0028] In some embodiments, the chloride ion content in the finished silica sand is ≤0.001%, and the silica content is ≥99.85%.

[0029] In some embodiments, the method produces 150-200 cubic meters of finished sand per hour.

[0030] A high-speed centrifugal water injection purification and dewatering machine for silica sand includes: Rack 1; The mixing tank 2 is installed on the frame 1. The mixing tank 2 is provided with a water tank 7 around its perimeter, and the walls of the mixing tank 2 are provided with a high wear-resistant polyurethane mesh. The centrifugal wheel 3 is installed inside the mixing tank 2. The centrifugal wheel 3 is provided with spiral blades 31 on its periphery. The maximum diameter of the spiral blades 31 is smaller than the inner diameter of the mixing tank 2. The feed hopper 4 is located above the mixing tank 2, and its discharge port is directly opposite the centrifugal wheel 3; The water inlet pipe 6 is connected to the inside of the mixing tank 2. The water inlet pipe 6 extends from the outside of the mixing tank 2 to the central cavity of the centrifugal wheel 3. The top of the pipe is provided with a horizontally outward-extending water outlet pipe 61, with the outlet facing the area between the centrifugal wheel 3 and the mixing tank 2. The system includes a drive mechanism, comprising a first motor 51 and a second motor 52. The first motor 51 is connected to the feed hopper 4 via a belt and drives the feed hopper 4 to rotate. The second motor 52 is connected to the centrifugal wheel 3 and drives it to rotate.

[0031] In some embodiments, a discharge hopper 8 is provided below the mixing tank 2 for collecting the processed silica sand.

[0032] Its detailed connection method is a well-known technology in this field. The following mainly introduces the working principle and process, and the specific work is as follows.

[0033] Example 1: High-speed centrifugal water injection purification and dehydration machine for marine silica sand like Figure 2 As shown, the present invention provides a high-speed centrifugal water injection purification and dehydration machine for marine silica sand. This equipment is used to implement the high-speed centrifugal water injection purification and dehydration method for marine silica sand described in the present invention. By combining high-speed centrifugation with water injection, chloride ions and harmful substances inside the silica sand are effectively removed.

[0034] The equipment includes a frame 1, which serves as the supporting foundation for the entire device. A mixing tank 2, a centrifugal wheel 3, and a feed hopper 4 are mounted on the frame 1. The mixing tank 2, fixedly mounted on the frame 1, has a cylindrical structure and forms a processing chamber inside. A water trough 7 is provided around the periphery of the mixing tank 2 to collect wastewater expelled by centrifugation. The peripheral wall of the mixing tank 2 is provided with a highly wear-resistant polyurethane mesh with several through holes to separate silica sand from water while preventing the loss of fine sand.

[0035] The centrifugal wheel 3 is installed inside the mixing tank 2 to generate centrifugal force on the silica sand under high-speed rotation. The centrifugal wheel 3 has spiral blades 31 on its circumference, which extend spirally along the axial direction of the centrifugal wheel 3. The maximum diameter of the spiral blades 31 is smaller than the inner diameter of the mixing tank 2, thus forming a silica sand processing gap between the spiral blades 31 and the inner wall of the mixing tank 2, facilitating the movement of the silica sand under centrifugal force and ensuring sufficient contact with water.

[0036] The feed hopper 4 is positioned above the mixing tank 2 and is used to supply silica sand to be processed into the equipment. The discharge port of the feed hopper 4 is directly opposite the centrifugal wheel 3, ensuring that the silica sand falling from the feed hopper 4 can accurately fall onto the centrifugal wheel 3 and be rotated and processed by the spiral blades 31.

[0037] The device also includes a drive mechanism for providing power. In this embodiment, the drive mechanism includes a first motor 51 and a second motor 52. The first motor 51 is connected to the feed hopper 4 via a belt and is used to drive the feed hopper 4 to rotate, achieving uniform feeding. The second motor 52 is connected to the centrifugal wheel 3 and is used to drive the centrifugal wheel 3 to rotate at high speed, so as to achieve the purpose of removing chloride ions and harmful substances from the silica sand.

[0038] The mixing tank 2 is connected to a water inlet pipe 6 for injecting cleaning water during the treatment process. The water inlet pipe 6 extends from the outside of the mixing tank 2 and enters the central cavity of the centrifugal wheel 3. At the top of the water inlet pipe, there is a horizontally extending water outlet pipe 61. The outlet of the water outlet pipe 61 faces the area between the centrifugal wheel 3 and the mixing tank 2, so that the sprayed water can be evenly sprinkled on the rotating silica sand to achieve water injection cleaning.

[0039] The mixing tank 2 is provided with a discharge hopper 8 at the bottom for collecting and discharging the processed finished silica sand.

[0040] The equipment's working process is briefly described as follows: The silica sand to be processed falls into the high-speed rotating centrifugal wheel 3 through the feed hopper 4. Driven by the centrifugal wheel 3 and the spiral blades 31 around it, the silica sand rotates at high speed inside the mixing tank 2. At the same time, the water inlet pipe 6 sprays clean water onto the rotating silica sand through the water outlet pipe 61. Under the action of high-speed centrifugal force, chloride ions and harmful substances in the silica sand dissolve in the water and flow with the water through the high wear-resistant polyurethane mesh on the periphery of the mixing tank 2, into the water tank 7 surrounding the mixing tank 2 for discharge. The treated clean silica sand falls into the discharge hopper 8 at the bottom of the mixing tank 2 under the action of gravity, and enters the next process or is collected as a finished product.

[0041] Example 2: High-speed centrifugal water injection purification and dehydration method for marine silica sand Please see Figure 1 The process flow diagram of the present invention shown above uses the equipment of Embodiment 1. The present invention provides a method for high-speed centrifugal water injection purification and dewatering of marine silica sand, including the following steps: Step 1: Activation Treatment. Marine silica sand is activated in batches. Water is injected into the silica sand pile, causing the surface colloids to peel off naturally. In this embodiment, the activation treatment uses recycled water recovered in subsequent steps, with each batch processing approximately 2000 cubic meters, which can fluctuate within the range of 1500-2500 cubic meters. This treatment does not require soaking; the silica sand enters an activated state immediately after water injection, reducing chloride ion content by 2%-3%.

[0042] Step 2: Screening and Impurity Removal. The activated silica sand is conveyed to a screening device and screened using a 0.4mm×0.4mm steel mesh to remove impurities such as mud, shells, and stones. The screened-out mud, shells, stones, and other waste materials can be recycled and used to make cement sand bricks or as road stabilized soil, realizing resource recycling.

[0043] Step 3: Mechanical Grinding. The sieved silica sand is fed into a high-speed grinder for processing. High-speed grinding breaks down the colloidal layer on the surface of the silica sand, opening the capillaries and facilitating the release of chloride ions. Simultaneously, the sand particles are rounded, and any remaining shell fragments are broken up. Water is added to the ground silica sand, and a mechanical dewatering machine is used to separate the sand and water.

[0044] Step 4: Centrifugal Water Injection Purification. The polished and dehydrated silica sand is fed into the high-speed centrifugal water injection purification and dehydration machine described in Example 1 for processing. This embodiment preferably adopts a two-stage treatment method: the first-stage centrifugal water injection purification and dehydration machine performs coarse treatment on the silica sand to remove most of the chloride ions and harmful substances; the second-stage centrifugal water injection purification and dehydration machine further refines the silica sand after the first-stage treatment to maximize the removal of chloride ions and harmful substances from the silica sand.

[0045] During the centrifugal water purification process, the silica sand is fully mixed with the clean water injected into the water inlet pipe 6 under the centrifugal force generated by the high-speed rotation of the centrifugal wheel 3 (preferably 900 rpm). Chloride ions and harmful substances dissolve in the water and pass through the high wear-resistant polyurethane mesh on the surrounding wall of the mixing tank 2 with the water, and are discharged into the water tank 7.

[0046] Step 5: Dehydration Test. The silica sand purified by centrifugation and water injection undergoes final dehydration to obtain the finished silica sand. Samples of the finished silica sand are taken in batches for testing to determine the chloride ion content and silicon content.

[0047] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

Claims

1. A method for high-speed centrifugal water injection purification and dehydration of marine silica sand, characterized in that, Includes the following steps: Activation treatment of silica sand; The activated silica sand is sieved to remove impurities; The sieved silica sand is mechanically ground. The polished silica sand is treated by centrifugal water injection purification, which uses centrifugal force combined with water injection to remove chloride ions and harmful substances from inside the silica sand. The treated silica sand is dehydrated to obtain the finished silica sand.

2. The method for high-speed centrifugal water injection purification and dewatering of marine silica sand according to claim 1, characterized in that... The activation treatment involves injecting water into the silica sand to allow the colloid on the surface of the silica sand to peel off naturally. Each batch is 1500-2500 cubic meters and no soaking is required.

3. The method for high-speed centrifugal water injection purification and dehydration of marine silica sand according to claim 1, characterized in that... The screening step uses a sieve with a mesh size of 0.4mm × 0.4mm for screening. The screened mud, shells and gravel are recycled for the preparation of building materials or road construction materials.

4. The method for high-speed centrifugal water injection purification and dewatering of marine silica sand according to claim 1, characterized in that... The mechanical grinding process uses a high-speed grinder to break the colloidal layer on the surface of the silica sand, round the sand grains, and crush any remaining shells.

5. The method for high-speed centrifugal water injection purification and dewatering of marine silica sand according to claim 1, characterized in that... The centrifugal water purification step adopts a two-stage treatment, including a first-stage coarse treatment and a second-stage fine treatment, to remove chloride ions and harmful substances from the silica sand step by step.

6. The method for high-speed centrifugal water injection purification and dewatering of marine silica sand according to claim 1, characterized in that... The water used in the activation process is recycled water recovered in subsequent steps.

7. The method for high-speed centrifugal water injection purification and dewatering of marine silica sand according to claim 1, characterized in that... The finished silica sand contains ≤0.001% chloride ions and ≥99.85% silica.

8. The method for high-speed centrifugal water injection purification and dewatering of marine silica sand according to claim 1, characterized in that... The method described above produces 150-200 cubic meters of finished sand per hour.

9. A high-speed centrifugal water injection purification and dewatering machine for implementing the method of claim 1, characterized in that, include: Rack (1); The mixing tank (2) is installed on the frame (1), the mixing tank (2) is provided with a water tank (7) around its periphery, and the mixing tank (2) is provided with a high wear-resistant polyurethane mesh on its periphery wall; The centrifugal wheel (3) installed in the mixing tank (2) has a spiral blade (31) on its periphery, and the maximum diameter of the spiral blade (31) is smaller than the inner diameter of the mixing tank (2). The feed hopper (4) is located above the mixing tank (2), and its discharge port is directly opposite the centrifugal wheel (3); A water inlet pipe (6) is connected to the inside of the mixing tank (2). The water inlet pipe (6) extends from the outside of the mixing tank (2) to the central cavity of the centrifugal wheel (3). A horizontally extending water outlet pipe (61) is provided at its top end. The outlet of the water outlet pipe (61) faces the area between the centrifugal wheel (3) and the mixing tank (2). The system includes a drive mechanism, comprising a first motor (51) and a second motor (52). The first motor (51) is connected to the feed hopper (4) via a belt and drives the feed hopper (4) to rotate. The second motor (52) is connected to the centrifugal wheel (3) and drives it to rotate.

10. The high-speed centrifugal water injection purification and dewatering machine for silica sand according to claim 9, characterized in that: The mixing tank (2) is equipped with a discharge hopper (8) for collecting the processed silica sand.

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