Natural gypsum treatment system and impurity removing and whitening method

Abstract

The invention relates to a natural gypsum treatment system and an impurity removing and whitening method, and the natural gypsum treatment system comprises a water washing barrel, the front end of the water washing barrel is provided with a feeding pipe in a penetrating manner, and the inner wall of the water washing barrel is provided with a spiral push plate and a bucket; a scraping plate is arranged in the washing barrel, and a gap is formed between the edge of the scraping plate and the spiral push plate; the liquid discharge tank is arranged in the washing barrel in a penetrating manner and is positioned above the axis of the washing barrel; the discharging groove is formed in the washing barrel in a penetrating mode and located above the liquid discharging groove, and in the axis direction of the washing barrel, gaps are formed between the scraping plate and the discharging groove and between the scraping plate and the bucket; and notches of the liquid discharge groove and the material discharge groove are vertically upward. The gypsum impurity removing and whitening method comprises the following procedures of crushing, screening, impurity removing, drying, calcining and smashing, and impurity removing is achieved through the natural gypsum treatment system. According to the scheme, impurities in the gypsum can be deeply removed, and the whiteness of the gypsum is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of gypsum treatment, and particularly relates to a natural gypsum treatment system and a method for impurity removal and whitening enhancement. Background Art

[0002] Currently, during the treatment of gypsum, organic and heavy metal impurities in gypsum are mainly removed by water washing and flotation methods. Common water washing equipment includes a water washing tank, a paste collecting tank, and a waste liquid tank. A stirring paddle for stirring the gypsum and a scraper for scraping off suspended bubbles are provided in the water washing tank. During flotation, organic and metal impurities are attached to the foam, and then the foam is scraped into the waste liquid tank by the scraper, thereby achieving the purpose of impurity removal.

[0003] During water washing, workers pour gypsum into the water washing tank, add water source into the water washing tank, stir the gypsum and water evenly by the paddle blades, so that scum such as organic impurities floats on the surface, and then the scum on the surface of the water washing tank is fished into the waste liquid tank by the scraper. Finally, the gypsum particles after removing the scum are pumped out of the water washing tank by manual shoveling or a suction pump. This method can only perform water washing and flotation treatment on gypsum batch by batch, and cannot produce continuously, resulting in low treatment efficiency. Summary of the Invention

[0004] To solve the deficiencies of the prior art, the present invention provides a natural gypsum treatment system and a method for impurity removal and whitening enhancement, which can deeply remove impurities in gypsum and improve the whiteness of gypsum.

[0005] To achieve the purpose of the present invention, the following scheme is proposed: A natural gypsum treatment system, comprising: A water washing barrel, horizontally arranged in a water tank, rotatably arranged around its axis, and having mesh holes on its outer wall; a feed pipe penetrates through the front end of the water washing barrel, spiral push plates are arranged on the front and middle sections of the inner wall of the water washing barrel, a bucket is arranged on the rear section of the inner wall, and one side facing the rotation direction of the water washing barrel is a groove structure; a scraper is arranged inside the water washing barrel for scraping the foam on the liquid surface, and there is a predetermined interval between the outer side edge of the scraper and the spiral push plate; A liquid discharge groove, penetrating through the water washing barrel, located above the axis of the water washing barrel, and the scraper is within the length range of the liquid discharge groove in the axial direction of the water washing barrel; A discharge trough, penetrating through the water washing barrel and located above the liquid discharge groove, and there are intervals between the scraper and the discharge trough and the bucket respectively in the axial direction of the water washing barrel; The mouths of the liquid discharge groove and the discharge trough are vertically upward, there are intervals between the liquid discharge groove and the scraper and between the discharge trough and the bucket respectively in the radial direction of the water washing barrel, and the rear ends of both the liquid discharge groove and the discharge trough extend outward from the rear end of the water washing barrel.

[0006] 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 natural gypsum treatment system.

[0007] The beneficial effects of the present invention are as follows: 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.

[0008] 2. The gypsum whitening method provided by this solution can quickly and effectively remove the impurities of natural gypsum on the basis of relying on the adsorption force system, thereby improving the whiteness of the gypsum finished product. Description of the Drawings

[0009] 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.

[0010] Figure 1 Shows the external structural schematic diagram of the processing system of the present application.

[0011] Figure 2 Shows the overall cross-sectional view of the processing system of the present application.

[0012] Figure 3 Shows the internal structural schematic diagram of the water washing barrel of the present application.

[0013] Figure 4 Shows along Figure 2 The cross-sectional view in the A-A direction in

[0014] Figure 5 Shows along Figure 2 The cross-sectional view in the B-B direction in

[0015] Figure 6 Shows the flow block diagram of the impurity removal and whitening method of the present application.

[0016] Markings in the figure: water washing barrel - 1, spiral push plate - 11, bucket - 12, drive motor - 13, gear ring - 14, gear - 15, feed pipe - 2, hopper - 21, spiral feed rod - 22, rotary motor - 23, scraper - 3, convex edge - 31, liquid discharge groove - 4, discharge chute - 5. Detailed Embodiments

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following describes the embodiments 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.

[0018] Embodiment 1, as Figures 1 to 5 shown, a natural gypsum treatment system includes: a water washing bucket 1, a liquid discharge tank 4, and a discharge tank 5.

[0019] The water washing bucket 1 is horizontally arranged in a water tank. The water washing bucket 1 is rotatably arranged around its axis, and its outer wall is provided with meshes for realizing the water quality exchange inside and outside the water washing bucket 1. Specifically, the water washing bucket 1 is driven by a motor. For example, the motor drives the water washing bucket 1 to rotate around its axis by means of belt drive or chain drive. In this embodiment, a driving motor 13 is provided at one end of the water tank. A gear ring 14 is coaxially provided at the end of the water washing bucket 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 bucket 1 to rotate. Specifically, both ends of the water washing bucket 1 are rotatably arranged on a support frame, and the support frames are all arranged inside the water tank. A feed pipe 2 penetrates through the front end of the water washing bucket 1 for continuously adding gypsum particles into the water washing bucket 1. Spiral push plates 11 are provided in the front section and the middle section of the inner wall of the water washing bucket 1 for pushing the gypsum particles input from the front end of the water washing bucket 1 to the rear end. A bucket 12 is provided in the rear section of the inner wall of the water washing bucket 1. As Figure 5 shown, the side facing the rotation direction of the water washing bucket 1 is a groove structure. Figure 5 The arc arrow in Figure 4 indicates the rotation direction of the water washing bucket 1. A scraper 3 is provided inside the water washing bucket 1. There is a predetermined interval between its outer side edge and the spiral push plate 11 to prevent the scraper 3 from lifting 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 bucket 1. And as Figure 4 shown, there is a convex edge 31 on the side of the inner edge of the scraper 3 facing the rotation direction of the water washing bucket 1.

[0020] The liquid discharge tank 4 penetrates through the water washing bucket 1 and is located above the axis of the water washing bucket 1. In the axial direction of the water washing bucket 1, the scraper 3 is within the length range of the liquid discharge tank 4.

[0021] The discharge tank 5 penetrates through the water washing bucket 1 and is located above the liquid discharge tank 4. In the axial direction of the water washing bucket 1, there are intervals between the scraper 3 and the discharge tank 5 and between the scraper 3 and the bucket 12.

[0022] The openings of the liquid discharge tank 4 and the discharge tank 5 face 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 bucket 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 bucket 1.

[0023] Combined with Figures 1 to 5 It is shown that the above solution is used for washing and impurity removal of gypsum, and the specific treatment process is as follows: Inject water into the pool to make the liquid level at the axial height of the washing bucket 1. The purpose is to form the maximum liquid level width inside the washing bucket 1 to facilitate scraping off the foam. Put the crushed gypsum particles into the front end inside the washing bucket 1 from the feeding pipe 2. The washing bucket 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 the water, and while stirring the gypsum particles, continuously push the gypsum particles towards the rear end of the washing bucket 1. When the gypsum particles move to the position where the bucket 12 is located, driven by the washing bucket 1, the bucket 12 shovels up the gypsum particles by using the groove facing the rotation direction of the washing bucket 1, and when the bucket 12 rotates to above the discharge chute 5, the gypsum automatically falls into the discharge chute 5, and then the washed gypsum is discharged by using the discharge chute 5. On the other hand, during the rotation of the washing bucket 1, the scraper 3 will also be driven to rotate outside the liquid discharge chute 4. When the scraper 3 is about to leave the water surface upwards, the side facing the rotation direction of the washing bucket 1 will lift the foam on the liquid surface, and during the upward rotation of the scraper 3, the foam will be discharged into the liquid discharge chute 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 chute 4.

[0024] The above solution only uses the operation of the washing bucket 1 to simultaneously realize two processes of washing and flotation, with lower operating energy consumption. And the mechanisms of washing and flotation are both integrated inside the washing bucket 1, with a more compact structure, which can effectively reduce the floor area. And this solution can realize automatic continuous feeding, washing, flotation and discharging. Compared with the batch processing method, the efficiency is higher. And this solution can limit the foam inside the washing bucket 1 to prevent the foam from overflowing, and the washing and flotation treatments start when the gypsum particles enter the washing bucket 1. As the gypsum particles move towards the rear end of the washing bucket 1, the impurities will gradually decrease. Therefore, even if some foam flows out from the rear end of the washing bucket 1, not too many impurities will be carried out.

[0025] Preferably, the rear ends of the liquid discharge chute 4 and the discharge chute 5 are both inclined downward to facilitate the purpose of automatic backward discharging.

[0026] Preferably, as Figure 2 、 Figure 3 shown, both the front end and the rear end of the washing bucket 1 have inwardly bent retaining rings to prevent the gypsum particles from falling from the ends of the washing bucket 1.

[0027] Preferably, a rotating sealing structure is provided between the outer wall of the feeding pipe 2 and the inner wall of the end of the washing bucket 1, such as a rubber sealing ring or a labyrinth seal. As Figure 1 、 Figure 2As 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 to achieve the purpose of continuous feeding.

[0028] 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 rotary motor 23 is arranged on the outer end face of the feed pipe 2 to drive the spiral pusher 22. This solution can enable the horizontally arranged feed pipe 2 to feed smoothly and 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.

[0029] 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.

[0030] Preferably, as Figures 3 to 5 shown, multiple scrapers 3 are arranged in a circumferential array inside the water washing barrel 1 to improve the efficiency of flotation and discharging.

[0031] Preferably, as Figure 3 shown, through holes are formed on the bottom plate of the bucket 12. The through holes are strip-shaped holes or round hole structures to facilitate filtering out excess liquid and only salvage gypsum particles.

[0032] Example 2, as Figure 6 shown, a method for removing impurities and whitening gypsum includes the following processes: crushing, screening, impurity removal, drying, calcination, and pulverization. Among them, impurity removal is realized by using the natural gypsum treatment system described in Example 1.

[0033] The specific process is as follows: The 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 gypsum; subsequently, the impurity-removed gypsum particles are dried to reduce the moisture in the raw materials during subsequent calcination and improve the calcination efficiency; then, the carbon substances in the gypsum particles are removed by calcination; and then pulverization is carried out to obtain semi-hydrated and anhydrous gypsum with deep impurity removal.

[0034] The traditional natural gypsum impurity removal process is as follows: coarse crushing, screening, mud removal, calcination, and pulverization. Therefore, impurities such as heavy metals and organic substances in the gypsum prepared by the traditional process result in low whiteness and low added value of the gypsum. Using the present solution to prepare gypsum powder can effectively improve the whiteness of the gypsum and reduce the impurity content.

[0035] 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 during the high-temperature calcination process and discharged into the atmosphere to be separated from the gypsum. At the same time, the crystal water in the gypsum is removed. By controlling the calcination temperature, hemihydrate gypsum or anhydrous gypsum can be produced.

[0036] Preferably, the pulverization process after calcination is realized by using a jet mill. The waste heat generated during calcination is used as the heat source for the drying process and as the medium for the jet mill, so as to improve the pulverization and drying effects and reduce energy consumption.

[0037] 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 various changes or equivalent replacements made to the present invention without departing from the scope of the present invention all fall within the scope of protection of the present invention.

Claims

1. A natural gypsum processing system, characterized in that: include: A water washing bucket (1) is horizontally arranged in a water pool, the water washing bucket (1) is arranged to rotate around an axis, and a mesh is provided on its outer wall; a feed pipe (2) is passed through the front end of the water washing bucket (1), a spiral push plate (11) is provided at the front section and the middle section of the inner wall of the water washing bucket (1), and a bucket (12) is provided at the rear section of the inner wall, and the side of the bucket (12) facing the rotation direction of the water washing bucket (1) is a groove structure; a scraper (3) is provided inside the water washing bucket (1) for scraping foam on the liquid surface, and a predetermined interval is provided between the outer side of the scraper (4) and the spiral push plate (11); A liquid drainage groove (4) is provided in the water washing barrel (1), the liquid drainage groove (4) is located above the axis of the water washing barrel (1), and the scraper (3) is located within the length range of the liquid drainage groove (4) in the direction of the axis of the water washing barrel (1); A discharge trough (5) is provided in the washing barrel (1) and is located above the drainage trough (4). In the axial direction of the washing barrel (1), there is a gap between the scraper (3) and the discharge trough (5) and the bucket (12); The notches of the drainage trough (4) and the material discharge trough (5) face vertically upwards, and there is a gap between the drainage trough (4) and the scraper (3) and between the material discharge trough (5) and the bucket (12) in the radial direction of the water washing barrel (1). The rear ends of the drainage trough (4) and the material discharge trough (5) extend outwards from the rear end of the water washing barrel (1).

2. A natural gypsum processing system according to claim 1, characterized in that: The front end and the rear end of the washing bucket (1) are both provided with inwardly bent retaining rings.

3. A natural gypsum processing system according to claim 1, characterized in that: A rotating sealing structure is provided between the outer wall of the feed pipe (2) and the inner wall of the end of the washing bucket (1); the outer end of the feed pipe (2) is a sealing structure; and a hopper (21) is provided above the feed pipe (2).

4. A natural gypsum processing system according to claim 3, characterized in that: The feed pipe (2) is coaxially arranged with the washing barrel (1), a spiral push rod (22) is coaxially passed through the interior of the feed pipe (2), and a rotating motor (23) is provided on the outer end surface of the feed pipe (2) for driving the spiral push rod (22).

5. A natural gypsum processing system according to claim 1, characterized in that: The front end of the drainage trough (4) is connected to the feed pipe (2), the rear end of the drainage trough (4) is penetrated through the side wall of the pool, and the discharge trough (5) is supported on the drainage trough (4).

6. A natural gypsum processing system according to claim 1, characterized in that: The scrapers (3) and the scrapers (3) are arranged in a plurality of locations in a circular array inside the washing bucket (1).

7. A natural gypsum processing system according to claim 1, characterized in that: A through hole is provided on the bottom plate of the bucket (12).

8. A method for removing impurities and whitening gypsum, characterized in that: The method comprises the following steps: crushing, screening, impurity removal, drying, calcining and pulverizing, wherein impurity removal is achieved by using the natural gypsum processing system described in any one of claims 1 to 7.

9. A gypsum impurity removal and whitening method according to claim 8, characterized in that: The calcination temperature is 800℃~1300℃.

10. A gypsum impurity removal and whitening method according to claim 8, characterized in that: The pulverizing process after calcination is achieved by using an air flow pulverizing device, and the residual heat generated by calcination is used as a heat source for the drying process and as a medium for the air flow pulverizing device.

Images