A natural gypsum treatment system and a method for impurity removal and whitening

Abstract

A natural gypsum treatment system and a method for impurity removal and whitening. Among them, the natural gypsum treatment system includes: a water-washing barrel, with a feed pipe passing through its front end, and a spiral push plate and a bucket are provided on the inner wall of the water-washing barrel; a scraper is arranged inside the water-washing barrel, and there is a gap between the edge of the scraper and the spiral push plate; a liquid discharge groove passes through the water-washing barrel and is located above the axis of the water-washing barrel; a discharge groove passes through the water-washing barrel and is located above the liquid discharge groove. In the axial direction of the water-washing barrel axis, there are gaps between the scraper and the discharge groove and the bucket; the openings of the liquid discharge groove and the discharge groove are vertically upward. The method for impurity removal and whitening of gypsum includes the following processes: crushing, screening, impurity removal, drying, calcination, and pulverization, among which the impurity removal is realized by using the above natural gypsum treatment system. This solution can deeply remove the impurities of gypsum and improve the whiteness of gypsum.

Description

Technical Field

[0001] The invention belongs to the technical field of gypsum processing, and in particular relates to a natural gypsum processing system and an impurity removal and whitening method. Background Art

[0002] Currently, gypsum processing primarily involves water washing and flotation to remove organic and heavy metal impurities. Common water washing equipment includes a water washing tank, a gypsum collection tank, and a wastewater tank. The water washing tank is equipped with a stirring paddle to stir the gypsum and a scraper to remove suspended bubbles. During flotation, foam is used to attach to organic and metallic impurities, which are then carried by the scraper to the wastewater tank, achieving the desired impurity removal.

[0003] During water washing, workers pour gypsum into a washing tank, add water, and use paddles to evenly stir the gypsum and water, causing organic impurities and other scum to float to the surface. A scraper then removes the scum from the washing tank into a wastewater tank. Finally, the descummed gypsum particles are removed from the washing tank by manual shoveling or suction pumping. This method only allows for batch washing and flotation of gypsum, preventing continuous production and resulting in low processing efficiency. Summary of the Invention

[0004] In order to solve the deficiencies of the existing technology, the present invention provides a natural gypsum processing system and an impurity removal and whitening method, which can deeply remove impurities in the gypsum and improve the whiteness of the gypsum.

[0005] In order to achieve the purpose of the present invention, the following scheme is proposed:

[0006] A natural gypsum processing system, comprising:

[0007] The washing barrel is horizontally arranged in a water pool and is rotatable about an axis. The outer wall of the washing barrel is provided with a mesh. A feed pipe is passed through the front end of the washing barrel. The front and middle sections of the inner wall of the washing barrel are provided with spiral push plates. The rear section of the inner wall is provided with a bucket. The side of the bucket facing the direction of rotation of the washing barrel is a groove structure. A scraper is provided inside the washing barrel for collecting foam on the liquid surface. A predetermined gap is formed between the outer edge of the scraper and the spiral push plate.

[0008] The drainage trough is provided in the washing barrel, the drainage trough is located above the axis of the washing barrel, and the scraper is located within the length range of the drainage trough in the direction of the axis of the washing barrel;

[0009] The discharge trough is provided in the washing barrel and is located above the drainage trough. In the axis direction of the washing barrel, there is a gap between the scraper and the discharge trough and the bucket.

[0010] The mouths of the liquid discharge tank and the discharge tank are vertically upward. There are intervals between the liquid discharge tank and the scraper and between the discharge tank and the bucket along the radial direction of the water washing barrel. The rear ends of both the liquid discharge tank and the discharge tank extend outward from the rear end of the water washing barrel.

[0011] A method for removing impurities and whitening gypsum includes the following processes: crushing, screening, impurity removal, drying, calcining, and pulverizing, wherein the impurity removal is realized by the above-mentioned natural gypsum treatment system.

[0012] The beneficial effects of the present invention are as follows:

[0013] 1. The gypsum treatment system provided by this solution realizes both the water washing and flotation processes only by the operation of the water washing barrel, with lower operating energy consumption. Moreover, the mechanisms for water washing and flotation are integrated inside the water washing barrel, making the structure more compact, effectively reducing the floor area. And this solution can achieve automatic continuous feeding, water washing, flotation, and discharging, with higher efficiency compared to the batch processing method.

[0014] 2. The gypsum whitening method provided by this solution can quickly and effectively remove the impurities of natural gypsum on the basis of the adsorption force system, thereby improving the whiteness of the gypsum finished product. Description of the Drawings

[0015] The drawings described herein are only for illustrating the selected embodiments, not all possible implementation schemes, and are not intended to limit the scope of the present invention.

[0016] Figure 1 Shows the external structural schematic diagram of the processing system of the present application.

[0017] Figure 2 Shows the overall cross-sectional view of the processing system of the present application.

[0018] Figure 3 Shows the internal structural schematic diagram of the water washing barrel of the present application.

[0019] Figure 4 Shows along Figure 2 The cross-sectional view in the direction of A-A in

[0020] Figure 5 Shows along Figure 2 The cross-sectional view in the direction of B-B in

[0021] Figure 6 Shows the flow block diagram of the impurity removal and whitening method of the present application.

[0022] Reference numerals in the drawings: water washing barrel - 1, spiral push plate - 11, bucket - 12, drive motor - 13, gear ring - 14, gear - 15, feed pipe - 2, hopper - 21, spiral feeding rod - 22, rotating motor - 23, scraper - 3, convex edge - 31, liquid discharge tank - 4, discharge tank - 5. Detailed implementation manners

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will describe the implementation manners of the present invention in detail with reference to the accompanying drawings. However, the embodiments described herein are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0024] Embodiment 1 is as follows Figures 1 to 5 As shown, a natural gypsum treatment system includes: a water washing barrel 1, a liquid discharge tank 4, and a discharge tank 5.

[0025] The water washing barrel 1 is horizontally arranged in a water pool. The water washing barrel 1 is rotatably arranged around its axis, and its outer wall is provided with mesh holes for realizing the water quality exchange inside and outside the water washing barrel 1. Specifically, the water washing barrel 1 is driven by a motor. For example, the motor drives the water washing barrel 1 to rotate around its axis through a belt drive or a chain drive. In this embodiment, a driving motor 13 is provided at one end of the water pool. A gear ring 14 is coaxially provided at the end of the water washing barrel 1, and a gear 15 meshing with the gear ring 14 is coaxially provided on the driving motor 13 to achieve the purpose of driving the water washing barrel 1 to rotate. Specifically, both ends of the water washing barrel 1 are rotatably arranged on a support frame, and the support frames are all arranged inside the water pool. A feed pipe 2 penetrates through the front end of the water washing barrel 1 for continuously adding gypsum particles into the water washing barrel 1. Spiral push plates 11 are provided at the front and middle sections of the inner wall of the water washing barrel 1 for pushing the gypsum particles input from the front end of the water washing barrel 1 to the rear end. A bucket 12 is provided at the rear section of the inner wall of the water washing barrel 1. As Figure 5 shown, the side facing the rotation direction of the water washing barrel 1 is a groove structure. Figure 5 The curved arrow in the figure indicates the rotation direction of the water washing barrel 1. A scraper 3 is provided inside the water washing barrel 1, and there is a predetermined interval between its outer side and the spiral push plate 11 to prevent the scraper 3 from lifting the gypsum particles. Even if the scraper 3 lifts some gypsum particles, they can automatically fall from the interval between the scraper 3 and the spiral push plate 11. The inner edge of the scraper 3 is parallel to the axis of the water washing barrel 1, and as Figure 4 shown, a convex edge 31 is provided on the side of the inner edge of the scraper 3 facing the rotation direction of the water washing barrel 1. Figure 4 The curved arrow in the figure indicates the rotation direction of the water washing barrel 1.

[0026] The liquid discharge tank 4 penetrates through the water washing barrel 1. The liquid discharge tank 4 is located above the axis of the water washing barrel 1. In the axial direction of the water washing barrel 1, the scraper 3 is within the length range of the liquid discharge tank 4.

[0027] The discharge tank 5 penetrates through the water washing barrel 1 and is located above the liquid discharge tank 4. In the axial direction of the water washing barrel 1, there are intervals between the scraper 3 and the discharge tank 5 and the bucket 12 respectively.

[0028] The mouths of the liquid discharge tank 4 and the discharge tank 5 are vertically upward. There are intervals between the liquid discharge tank 4 and the scraper 3 and between the discharge tank 5 and the bucket 12 in the radial direction of the water washing barrel 1. The rear ends of both the liquid discharge tank 4 and the discharge tank 5 extend outward from the rear end of the water washing barrel 1.

[0029] Combined with Figures 1 to 5 Shown, the above solution is used for washing and removing impurities from gypsum. The specific treatment process is as follows:

[0030] Inject water into the water tank to make the liquid level at the axis height of the water washing barrel 1. The purpose is to form the maximum liquid level width inside the water washing barrel 1 to facilitate scraping off the foam. Put the crushed gypsum particles into the front end inside the water washing barrel 1 from the feed pipe 2. The water washing barrel 1 rotates continuously, and the spiral push plate 11 is used to stir the gypsum particles, so as to promote the impurities on the gypsum particles to dissolve in water, and while stirring the gypsum particles, continuously push the gypsum particles towards the rear end of the water washing barrel 1. When the gypsum particles move to the position where the bucket 12 is located, driven by the water washing barrel 1, the bucket 12 shovels up the gypsum particles by using the groove facing the rotation direction of the water washing barrel 1, and when the bucket 12 rotates above the discharge tank 5, the gypsum automatically drops into the discharge tank 5, and then the washed gypsum is discharged by using the discharge tank 5. On the other hand, during the rotation of the water washing barrel 1, it will also drive the scraper 3 to rotate outside the liquid discharge tank 4. When the scraper 3 is about to leave the water surface upwards, the side facing the rotation direction of the water washing barrel 1 will lift the foam on the liquid surface, and during the upward rotation of the scraper 3, the foam is discharged into the liquid discharge tank 4. During the process, the convex edge 31 provided on the scraper 3 can slow down or prevent the foam on the scraper 3 from slipping off prematurely. The collected foam is automatically discharged backward through the liquid discharge tank 4.

[0031] The above solution only uses the operation of the water washing barrel 1 to simultaneously realize two processes of water washing and flotation, with lower operating energy consumption. And the mechanisms of water washing and flotation are both integrated inside the water washing barrel 1, the structure is more compact, which can effectively reduce the floor area. And this solution can realize automatic continuous feeding, water washing, flotation and discharging. Compared with the batch processing method, the efficiency is higher. And this solution can limit the foam inside the water washing barrel 1 to prevent the foam from overflowing. And when the gypsum particles enter the water washing barrel 1, the water washing and flotation treatments start. As the gypsum particles move towards the rear end of the water washing barrel 1, the impurities will gradually decrease. So even if some foam flows out from the rear end of the water washing barrel 1, not too many impurities will be carried out.

[0032] Preferably, the rear ends of both the liquid discharge tank 4 and the discharge tank 5 are inclined downward to facilitate the purpose of automatic backward discharging.

[0033] Preferably, as Figure 2 、 Figure 3 shown, both the front end and the rear end of the water washing barrel 1 have inwardly bent retaining rings to prevent the gypsum particles from falling from the ends of the water washing barrel 1.

[0034] Preferably, a rotating sealing structure is provided between the outer wall of the feed pipe 2 and the inner wall of the end of the water washing barrel 1, such as a rubber sealing ring or a labyrinth seal. As Figure 1 , Figure 2 shown, the outer end of the feed pipe 2 is a sealed structure to prevent the liquid in the water tank from flowing out. A hopper 21 is connected above the feed pipe 2 for the purpose of continuous feeding.

[0035] Preferably, as Figure 2 shown, the feed pipe 2 is coaxially arranged with the water washing barrel 1. A spiral pusher 22 is coaxially arranged inside the feed pipe 2. A rotating motor 23 is arranged on the outer end face of the feed pipe 2 for driving the spiral pusher 22. This solution can enable the horizontally arranged feed pipe 2 to feed smoothly and can effectively control the feeding speed. Specifically, the feed pipe 2 penetrates through the side wall of the water tank, and the ends of the liquid discharge groove 4 and the discharge groove 5 both penetrate through the side wall of the water tank.

[0036] As a further preferred solution, as Figure 3 shown, the front end of the liquid discharge groove 4 is connected to the feed pipe 2, and the rear end of the liquid discharge groove 4 penetrates through the side wall of the water tank to avoid the liquid discharge groove 4 being suspended, improving the installation stability of the liquid discharge groove 4. The discharge groove 5 is supported on the liquid discharge groove 4.

[0037] Preferably, as Figures 3 to 5 shown, the scraper 3 and the bucket 12 are both arranged at multiple positions along the circumferential array inside the water washing barrel 1 to improve the efficiency of flotation and discharging.

[0038] Preferably, as Figure 3 shown, through holes are formed in the bottom plate of the bucket 12. The through holes are strip-shaped holes or round hole structures to facilitate filtering out the excess liquid and only salvage the gypsum particles.

[0039] Example 2, as Figure 6 shown, a method for removing impurities and whitening gypsum includes the following processes: crushing, screening, impurity removal, drying, calcining and pulverizing, wherein the impurity removal is realized by using the natural gypsum treatment system described in Example 1.

[0040] The specific process is as follows: Natural mineral gypsum is dried and then crushed; the crushed material is sieved to separate gypsum particles and dry powder clay; subsequently, the sieved gypsum particles are washed and floated to deeply remove soluble salts, organic matter, silicate minerals, and metal oxides in the gypsum. Flotation can remove the organic matter impurities remaining after pickling; silicate minerals, such as quartz, feldspar and other silicate minerals, and metal oxides include iron, manganese and other metal oxide impurities, and increase the whiteness of the gypsum; then the gypsum particles after impurity removal are dried to reduce the moisture in the raw material during subsequent calcination and improve the calcination efficiency; then the carbon substances in the gypsum particles are removed by calcination; and then it is pulverized to obtain semi-hydrated and anhydrous gypsum with deep impurity removal.

[0041] The traditional impurity removal process of natural gypsum is as follows: Coarse crushing, screening, desliming, calcination, and pulverization. Therefore, impurities such as heavy metals and organic matter in the gypsum prepared by the traditional process result in low whiteness of the gypsum and low added value. Using the present solution to prepare gypsum powder can effectively improve the whiteness of the gypsum and reduce the impurity content.

[0042] Preferably, the calcination temperature of the gypsum impurity removal and whitening method is 800°C to 1300°C. The calcination process can remove the carbon substances in the gypsum. The carbon substances are converted into CO2 and discharged into the atmosphere during high-temperature calcination, separated from the gypsum, and at the same time, the crystal water in the gypsum is removed. By controlling the calcination temperature, semi-hydrated gypsum or anhydrous gypsum can be produced.

[0043] Preferably, the pulverization process after calcination is realized by using a pneumatic pulverization device. The waste heat generated during calcination is used as the heat source for the drying process and as the medium for the pneumatic pulverization device, so as to improve the pulverization and drying effects and reduce energy consumption.

[0044] The above are only the preferred embodiments of the present invention, and do not represent the only or limit the present invention. Those skilled in the art should understand that without departing from the scope of the present invention, various changes or equivalent substitutions made to the present invention all fall within the scope of protection of the present invention.

Claims

1. A natural gypsum treatment system, characterized in that, Comprising: A washing barrel (1), horizontally arranged in a water tank, the washing barrel (1) is rotatably arranged around an axis, and its outer wall is provided with meshes; a feed pipe (2) penetrates through the front end of the washing barrel (1), and spiral pushing plates (11) are arranged at the front and middle sections of the inner wall of the washing barrel (1), and a bucket (12) is arranged at the rear section of the inner wall, and one side facing the rotation direction of the washing barrel (1) is a groove structure; a scraper (3) is arranged inside the washing barrel (1) for scraping the foam on the liquid surface, and there is a predetermined interval between the outer side edge of the scraper (3) and the spiral pushing plate (11), and the inner edge of the scraper (3) has a convex edge (31) on the side facing the rotation direction of the washing barrel (1); A liquid discharge groove (4) penetrates through the washing barrel (1), the liquid discharge groove (4) is located above the axis of the washing barrel (1), and in the axial direction of the washing barrel (1), the scraper (3) is within the length range of the liquid discharge groove (4); A discharge trough (5) penetrates through the washing barrel (1) and is located above the liquid discharge trough (4). In the axial direction of the washing barrel (1), there are intervals between the scraper (3) and the discharge trough (5) and the bucket (12); The openings of the liquid discharge groove (4) and the discharge trough (5) face vertically upward, and there are intervals between the liquid discharge groove (4) and the scraper (3) and between the discharge trough (5) and the bucket (12) in the radial direction of the washing barrel (1). The rear ends of both the liquid discharge groove (4) and the discharge trough (5) extend outward from the rear end of the washing barrel (1); A rotational sealing structure is provided between the outer wall of the feed pipe (2) and the inner wall of the end of the washing barrel (1). The outer end of the feed pipe (2) is a sealed structure, and a hopper (21) is communicated and arranged above the feed pipe (2); The feed pipe (2) is coaxially arranged with the washing barrel (1), a spiral pushing rod (22) is coaxially penetrated inside the feed pipe (2), and a rotating motor (23) is arranged on the outer end face of the feed pipe (2) for driving the spiral pushing rod (22); Both the scraper (3) and the bucket (12) are arranged at multiple positions in a circumferential array inside the washing barrel (1).

2. The natural gypsum treatment system according to claim 1, characterized in that, Both the front end and the rear end of the washing barrel (1) have inwardly bent retaining rings.

3. The natural gypsum treatment system according to claim 1, characterized in that, The front end of the liquid discharge groove (4) is connected to the feed pipe (2), the rear end of the liquid discharge groove (4) penetrates through the side wall of the water tank, and the discharge trough (5) is supported on the liquid discharge groove (4); 4. A natural gypsum treatment system according to claim 1, characterized in that, Through holes are provided on the bottom plate of the bucket (12).

5. A method for removing impurities and whitening gypsum, characterized in that, Including the following processes: crushing, screening, impurity removal, drying, calcination, and pulverization, wherein the impurity removal is realized by the natural gypsum treatment system described in any one of claims 1 to 4.

6. A method for removing impurities and whitening gypsum according to claim 5, characterized in that, The calcination temperature is 800°C to 1300°C.

7. A method for removing impurities and whitening gypsum according to claim 5, characterized in that The pulverization process after calcination is realized by a pneumatic pulverization device, and the waste heat generated during calcination is used as the heat source for the drying process and as the medium for the pneumatic pulverization device.

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