Circulating pelletizing system and process for calcium oxide powder calcinated from calcium carbide slag

Abstract

Disclosed in the present invention are a circulating pelletizing system and process for a calcium oxide powder calcinated from calcium carbide slag. The technical solution is as follows: the circulating pelletizing system comprises an aggregate bin, a powder bin, a mixing device, a powder pre-pressing bin, a pre-presser, a pulverizer, an intermediate bin, a pelletizing machine, a trommel screen and a finished-product bin, wherein discharge ports of the aggregate bin and the powder bin are each connected to a first gate valve, a discharge port of the first gate valve is connected to a first star-type ash discharge valve, a discharge port of the first star-type ash discharge valve is connected to a screw scale, a discharge port of the screw scale is connected to the mixing device, a discharge port of the mixing device is connected to a first belt conveyor, a discharge port of the first belt conveyor is connected to a first bucket hoist, and a discharge port of the first bucket hoist is connected to a first FU chain conveyor. The beneficial effects of the present invention lie in: using the powder which undergoes primary pelletizing and pulverizing as the raw material for secondary pelletizing improves the structural strength of the powder, optimizes the particle size distribution of the pelletizing raw material, and significantly increases the pellet formation rate of a product.

Description

Calcium oxide powder calcination and recycling ball pressing system and process of carbide slag TECHNICAL FIELD

[0001] The present application relates to the field of carbide slag, in particular to a calcium oxide powder calcination and recycling ball pressing system and process of carbide slag. BACKGROUND

[0002] Carbide slag is the residue after calcium carbide hydration, and its main components are calcium hydroxide and a small amount of inorganic and organic impurities such as sulfides, phosphides, iron oxides, magnesium oxides, and silicon dioxide. It is grayish white due to the presence of trace amounts of carbon and sulfur and phosphorus impurities, and has a slight odor. Although the industry has been developing the utilization of solid waste from carbide slag for many years, such as using it as a raw material for cement production, a desulfurizing agent, and a brick-making raw material, the overall processing volume is low. At the same time, as a raw material for calcium carbide production, the exploitation and utilization of limestone resources are gradually restricted, and the production cost is increasing year by year. Therefore, reducing and calcining carbide slag and recycling it for calcium carbide production is the most economically valuable and environmentally friendly utilization method for carbide slag, and it is also the most urgent technical requirement for calcium carbide enterprises in recent years. Currently, due to the characteristics of carbide slag, a powder suspension calcination process can be used to produce high-activity calcium oxide powder with an activity of more than 360ml. However, due to the differences in physical and chemical properties between the calcined lime powder and the traditional industrial kiln undersize lime, including particle size and composition, the traditional ball pressing system cannot adapt to the pressing process of calcined calcium oxide, resulting in problems such as inability to form, low ball forming rate, and poor strength. Pressing and forming has become a key link in the recycling of calcined calcium oxide powder from carbide slag, and needs to be broken through.

[0003] The existing technology has the following disadvantages: The existing powder calcination process has differences in physical properties, which can cause the following problems when using a pair of high-pressure ball presses to press and form the calcined calcium oxide powder from carbide slag: fast powder flow rate, low ball forming rate, and easy adhesion to the ball socket of the press roller. Subsequent powder is prone to sticking together in sheets, which has low strength and seriously restricts the application of the calcined calcium oxide powder from carbide slag in actual production.

[0004] Therefore, it is necessary to invent a calcium oxide powder calcination and recycling ball pressing system and process of carbide slag.

[0005] SUMMARY

[0006] To solve the problems of fast powder flow rate, low ball forming rate, and easy adhesion to the ball socket of the press roller, the present application provides a calcium oxide powder calcination and recycling ball pressing system and process of carbide slag, which pre-presses the powder once and then breaks it to serve as the raw material for the second ball pressing, reduces the flowability of the raw material for the second ball pressing, improves the bulk density, improves the powder structure strength, and optimizes the particle size distribution.

[0007] In order to achieve the above object, the present application provides the following technical scheme: A calcium carbide slag calcined calcium oxide powder circulating ball pressing system and process, comprising an aggregate bin, a powder bin, a mixing device, a pre-pressing powder bin, a pre-pressing machine, a pulverizer, an intermediate bin, a ball press, a roller screen and a finished product bin, the discharge outlet of the aggregate bin and the powder bin is connected with a plug valve one, the discharge outlet of the plug valve one is connected with a star-shaped dust valve one, the discharge outlet of the star-shaped dust valve one is connected with a screw scale, the discharge outlet of the screw scale is connected with the mixing device, the discharge outlet of the mixing device is connected with a belt conveyor one, the discharge outlet of the belt conveyor one is connected with a bucket elevator one, the discharge outlet of the bucket elevator one is connected with a FU chain conveyor one, the discharge outlet of the FU chain conveyor one is connected with the pre-pressing powder bin, the discharge outlet of the pre-pressing powder bin is connected with a plug valve two, the discharge outlet of the plug valve two is connected with a star-shaped dust valve two, the discharge outlet of the star-shaped dust valve two is connected with a screw conveyor one, the discharge outlet of the screw conveyor one is connected with the pre-pressing machine, the discharge outlet of the pre-pressing machine is connected with the pulverizer, the discharge outlet of the pulverizer is connected with a screw conveyor two, the discharge outlet of the screw conveyor two is connected with a bucket elevator two, the discharge outlet of the bucket elevator two is connected with a FU chain conveyor two, the discharge outlet of the FU chain conveyor two is connected with the intermediate bin, the discharge outlet of the intermediate bin is connected with a plug valve three, the discharge outlet of the plug valve three is connected with a star-shaped dust valve three, the discharge outlet of the star-shaped dust valve three is connected with a screw conveyor three, the discharge outlet of the screw conveyor three is connected with the ball press, the discharge outlet of the ball press is connected with a belt conveyor two, the discharge outlet of the belt conveyor two is connected with a bucket elevator three, the discharge outlet of the bucket elevator three is connected with the roller screen, the undersize discharge outlet of the roller screen is connected with the aggregate bin, and the oversize discharge outlet of the roller screen is connected with the finished product bin.

[0008] Preferably, the roller screen is provided with a variable frequency speed regulation, and the proportion of undersize discharge of the roller screen can be adjusted by adjusting the rotating speed of the roller screen and the screen aperture.

[0009] Preferably, the screen aperture of the roller screen is 6-10 mm.

[0010] Preferably, the undersize discharge outlet of the roller screen is connected with the finished product bin.

[0011] Preferably, the aggregate bin and the powder bin are provided with a bag dust collector one, the pre-pressing powder bin is provided with a bag dust collector two, and the intermediate bin is provided with a bag dust collector three.

[0012] Preferably, the process comprises the following steps:

[0013] S1, the calcined calcium oxide powder is conveyed to the powder bin, and the aggregate from the aggregate bin is conveyed to the mixing device through the screw scale to be fully mixed;

[0014] S2, after mixing, the powder material is transported to a pre-pressed powder bin, and then transported to a pre-pressing machine by a screw conveyor to perform primary pre-pressing, and reasonable linear pressure is controlled to improve the structural strength of the powder;

[0015] S3, after pre-pressing, the granular material is transported to a crusher to be crushed as secondary ball pressing raw material, the flowability of the secondary ball pressing raw material is reduced, the bulk density is improved, and the particle size distribution is optimized;

[0016] S4, the secondary ball pressing raw material is transported to an intermediate bin, and then transported to a ball pressing machine by a screw conveyor to realize high-efficiency and high-strength ball pressing;

[0017] S5, after pressing, the ball is transported to a drum screen for screening, and the qualified finished product enters a finished product bin, and the undersize material is transported to an aggregate bin for recycling.

[0018] Preferably, in S1, the screened material before entering the calcium carbide furnace is used as the aggregate, and the undersize material of the drum screen is gradually used as the aggregate after stable production.

[0019] Preferably, the aggregate and the powder in S1 account for not less than 3:7.

[0020] Preferably, in S3, the crusher crushes the pre-pressed granular material into 0-5mm particles.

[0021] The beneficial effects of the present application are:

[0022] 1. The problem of low balling rate of the existing ball pressing system is solved, the powder primary ball pressing is crushed as secondary ball pressing raw material to improve the structural strength of the powder, optimize the particle size distribution of the ball pressing raw material, and greatly improve the product balling rate, and the balling rate reaches more than 90%;

[0023] 2. The problem that the ball pressing strength of the existing ball pressing system is poor, the strength is not up to standard, and the ball pressing cannot be recycled to the calcium carbide furnace is solved, the aggregate and the powder ratio and the roller surface linear pressure of the ball pressing machine are adjusted to realize high-strength ball pressing of the calcium carbide slag calcined calcium oxide powder and recycling to the calcium carbide furnace;

[0024] 3. Through mixing, pre-pressing, crushing, ball pressing and screening processes, the use of a binder is avoided, the quality of the ball pressing product is ensured, and the cost is reduced;

[0025] 4. The undersize material reenters the aggregate bin through the return system, the aggregate and powder ratio can be adjusted in real time according to the characteristics of the calcium carbide slag calcined calcium oxide powder, and continuous and stable pressing is realized. BRIEF DESCRIPTION OF DRAWINGS

[0026] Fig. 1 is a process flow diagram of the calcium carbide slag calcined calcium oxide powder circulating ball pressing provided by the present application;

[0027] Fig. 2 is a powder flow diagram of the calcium carbide slag calcined calcium oxide powder circulating ball pressing system provided by the present application.

[0028] In the figure: aggregate bin 1, powder bin 2, plug valve 21, star-shaped dust valve 22, screw scale 23, bag dust collector 24, mixing device 3, belt conveyor 31, bucket elevator 32, FU chain conveyor 33, pre-press powder bin 4, plug valve 41, star-shaped dust valve 42, screw conveyor 43, bag dust collector 44, pre-press machine 5, crusher 6, screw conveyor 61, bucket elevator 62, FU chain conveyor 63, intermediate bin 7, plug valve 71, star-shaped dust valve 72, screw conveyor 73, bag dust collector 74, ball press 8, belt conveyor 81, bucket elevator 82, drum screen 9, finished product bin 10. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings, and it should be understood that the preferred embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0030] Referring to Figs. 1-2, the present application provides a calcium oxide powder circulating ball press system and process for calcium carbide slag calcination, which comprises an aggregate bin 1, a powder bin 2, a mixing device 3, a pre-press powder bin 4, a pre-press machine 5, a crusher 6, an intermediate bin 7, a ball press 8, a drum screen 9, and a finished product bin 10.

[0031] Further, the aggregate bin 1 and the powder bin 2 discharge port are connected with the plug valve one 21, the plug valve one 21 discharge port is connected with the star-shaped dust valve one 22, the star-shaped dust valve one 22 discharge port is connected with the screw scale 23, the screw scale 23 discharge port is connected with the mixing device 3, the mixing device 3 discharge port is connected with the belt conveyor one 31, the belt conveyor one 31 discharge port is connected with the bucket elevator one 32, the bucket elevator one 32 discharge port is connected with the FU chain conveyor one 33, the FU chain conveyor one 33 discharge port is connected with the pre-press powder bin 4, the pre-press powder bin 4 discharge port is connected with the plug valve two 41, the plug valve two 41 discharge port is connected with the star-shaped dust valve two 42, the star-shaped dust valve two 42 discharge port is connected with the screw conveyor one 43, the screw conveyor one 43 discharge port is connected with the pre-press machine 5, the pre-press machine 5 discharge port is connected with the pulverizer 6, the pulverizer 6 discharge port is connected with the screw conveyor two 61, the screw conveyor two 61 discharge port is connected with the bucket elevator two 62, the bucket elevator two 62 discharge port is connected with the FU chain conveyor two 63, the FU chain conveyor two 63 discharge port is connected with the intermediate bin 7, the intermediate bin 7 discharge port is connected with the plug valve three 71, the plug valve three 71 discharge port is connected with the star-shaped dust valve three 72, the star-shaped dust valve three 72 discharge port is connected with the screw conveyor three 73, the screw conveyor three 73 discharge port is connected with the ball press machine 8, the ball press machine 8 discharge port is connected with the belt conveyor two 81, the belt conveyor two 81 discharge port is connected with the bucket elevator three 82, the bucket elevator three 82 discharge port is connected with the drum screen 9, the drum screen 9 under-screen discharge port is connected with the aggregate bin 1, the drum screen 9 over-screen discharge port is connected with the finished product bin 10, specifically, the aggregate bin 1 has the function of placing aggregate, the powder bin 2 has the function of placing calcium oxide powder, the plug valve one 21 principle is that a circular opening with a certain diameter is opened on the gate, and the circular opening on the gate is completely separated and matched with the diameter by opening and closing the gate, the plug valve one 21 has the function of controlling the flow of aggregate and calcium oxide powder, the star-shaped dust valve one 22 is relied on the gravity of the material and the forced action of the feeder working mechanism to unload the material in the bin and continuously and uniformly feed it into the next device, the star-shaped dust valve one 22 has the function of uniformly feeding the aggregate and calcium oxide powder into the screw scale 23, the screw scale 23 is a production metering device for controlling the feeding, dynamic metering and continuous conveying of powder materials, the screw scale 23 has the function of conveying the aggregate and calcium oxide powder into the mixing device 3, the mixing device 3 has the function of mixing the aggregate and calcium oxide powder, the mixing device 3 has the function of conveying the mixed powder into the belt conveyor one 31, the belt conveyor one 31 has the function of strong conveying capacity, long conveying distance, simple structure, easy maintenance, and convenient program control and automatic operation, the belt conveyor one 31 has the function of conveying the mixed powder into the bucket elevator one 32, the bucket elevator one 32 is a continuous conveying machine for vertically lifting materials by using a series of hoppers uniformly fixed on a non-end traction member, the bucket elevator one 32 has the function of being suitable for lifting materials from low to high,The bucket elevator one 32 has the effect of conveying the mixed material into the FU chain conveyor one 3, which is a product for conveying powdery and small granular material horizontally or at an inclination of 15°, and the FU chain conveyor one 3 has the effect of conveying the mixed powder into the pre-press powder bin 4, which has the effect of placing the mixed powder, the gate valve two 41 has the effect of controlling the flow of the mixed powder in the pre-press powder bin 4, the star-shaped dust valve two 42 has the effect of uniformly feeding the mixed powder into the screw conveyor one 43, which is a machine that uses a motor to drive the screw to rotate and push the material to achieve the purpose of conveying, and it can convey horizontally, obliquely or vertically, has the advantages of simple structure, small cross-sectional area, good sealing performance, easy operation, easy maintenance and convenient closed transportation, the screw conveyor one 43 has the effect of conveying the mixed powder into the pre-press 5, the crusher 6 is used to crush and grind raw materials by a crushing and grinding machine, increase the surface area of the material, the crusher 6 has the effect of crushing the particles after pre-pressing, the crushed powder has the effects of being used as a secondary ball pressing raw material, reducing the flowability of the secondary ball pressing raw material, improving the bulk density and optimizing the particle size distribution, the crusher 6 has the effect of conveying the secondary ball pressing raw material into the screw conveyor two 61, the screw conveyor two 61 has the effect of conveying the secondary ball pressing raw material into the bucket elevator two 62, the bucket elevator two 62 has the effect of conveying the secondary ball pressing raw material into the FU chain conveyor two 63, the FU chain conveyor two 63 has the effect of conveying the secondary ball pressing raw material into the intermediate bin 7, which has the effects of stabilizing the flow and the material pressure, the gate valve three 71 has the effect of controlling the flow of the secondary ball pressing raw material in the intermediate bin 7, the star-shaped dust valve three 72 has the effect of uniformly feeding the secondary ball pressing raw material into the screw conveyor three 73, the screw conveyor three 73 has the effect of conveying the secondary ball pressing raw material into the ball press 8, which is mainly used for pressing powdery materials that are difficult to form, and has the characteristics of high forming pressure, adjustable main machine rotation and equipped with a screw feeding device, the ball press 8 has the effect of realizing high-efficiency and high-strength ball pressing, the ball press 8 has the effect of extruding the secondary ball pressing raw material into pellets, the ball press 8 has the effect of conveying the pellets into the belt conveyor two 81, the belt conveyor two 81 has the effect of conveying the pellets into the bucket elevator three 82, the bucket elevator three 82 has the effect of conveying the pellets into the drum screen 9, which has the effect of screening the pellets, and the drum screen 9 has the effect of conveying the unqualified products screened out into the aggregate bin 1 for recycling.

[0032] Further, the drum screen 9 has a screening aperture of 6-10 mm, and specifically, the drum screen 9 has a screening aperture of 6-10 mm, which has the effect of adjusting the screening size, and the drum screen 9 has a preferred screening aperture of 8 mm.

[0033] Further, the drum screen 9 discharge port is connected with the finished product bin 10, and specifically, the drum screen 9 has the function of conveying the screened qualified products into the finished product bin 10.

[0034] Further, the aggregate bin 1 and the powder bin 2 inlet are provided with a bag dust collector one 24, the pre-pressing powder bin 4 inlet is provided with a bag dust collector two 44, and the intermediate bin 7 inlet is provided with a bag dust collector three 74, and specifically, the bag dust collector one 24 has the function of collecting the dust on the aggregate and calcium oxide powder entering the aggregate bin 1 and the powder bin 2 respectively, the bag dust collector two 44 has the function of collecting the dust on the mixed powder entering the pre-pressing powder bin 4, and the bag dust collector three 74 has the function of collecting the dust on the secondary ball pressing raw material entering the intermediate bin 7.

[0035] Further, the method comprises the steps of:

[0036] S1, the calcined calcium oxide powder is conveyed to the powder bin 2 through a conveying device one, and is fully mixed with the aggregate conveyed to the mixing device 3 through a feeding device one, in the initial operation of the ball pressing system, the screened material before entering the calcium carbide furnace is used as the aggregate, and after stable production, the aggregate is gradually replaced by the screened material of the drum screen 9, the drum screen 9 is provided with a variable frequency speed regulation, the proportion of the screened material of the drum screen 9 can be adjusted by adjusting the rotating speed and the screening aperture of the drum screen 9, the proportion of the aggregate and the powder is not less than 3:7, and specifically, after stable production, the aggregate is gradually replaced by the screened material of the drum screen 9, which has the functions of saving energy and improving efficiency, the basic principle of the variable frequency speed regulation is that the rotating speed of the motor is proportional to the input frequency of the power supply, the variable frequency speed regulation changes the rotating speed of the drum screen 9 by changing the frequency of the power supply of the motor, and the proportion of the screened material of the drum screen 9 can be adjusted by adjusting the rotating speed and the screening aperture of the drum screen 9;

[0037] S2, after mixing, the powder is conveyed to the pre-pressing powder bin 4, and is conveyed to the pre-pressing machine 5 through a screw conveyor one 43 to perform primary pre-pressing, and the reasonable linear pressure is controlled to improve the structural strength of the powder;

[0038] S3, after pre-pressing, the granular material is conveyed to the crusher 6 through a conveying device two to be crushed as the secondary ball pressing raw material, the flowability of the secondary ball pressing raw material is reduced, the bulk density is improved, and the particle size distribution is optimized, the pre-pressed granular material is crushed into 0-5mm particles by the crusher 6, and specifically, the pre-pressed granular material is crushed into 0-5mm particles by the crusher 6, which has the functions of improving the balling rate and reducing the flowability, and the crushed particles are preferably 2.5mm;

[0039] S4, the secondary ball pressing raw material is conveyed to the intermediate bin 7, and is conveyed to the ball pressing machine 8 through a screw conveyor three 73 to realize high-efficiency and high-strength ball pressing.

[0040] S5, the pellets are transported to the drum screen 9 for screening after being pressed, the qualified products enter the finished product bin 10, and the undersize material is transported to the aggregate bin 1 for recycling.

[0041] The use process of the application is as follows: when using the application, first, the calcium carbide furnace is used to screen the material before entering the furnace as aggregate, and the aggregate is transported to the aggregate bin 1, and at the same time, the calcined calcium oxide powder is transported to the powder bin 2, then the aggregate bin 1 and the powder bin 2 will transmit the aggregate and the calcium oxide powder to the star-shaped dust valve 1 21 through the plug valve 1 21, the star-shaped dust valve 1 22 will uniformly feed the aggregate and the calcium oxide powder into the screw scale 23, the screw scale 23 will transport the aggregate and the calcium oxide powder to the mixing device 3, then the mixing device 3 will mix the aggregate and the calcium oxide powder, after mixing, the mixing device 3 will transport the mixed powder to the belt conveyor 1 31, the belt conveyor 1 31 will transport the mixed powder to the bucket elevator 1 32, then the bucket elevator 1 32 will transport the mixed material to the FU chain conveyor 1 3, the FU chain conveyor 1 3 will transport the mixed powder to the pre-press powder bin 4, then the pre-press powder bin 4 will flow the mixed powder into the star-shaped dust valve 2 42 through the plug valve 2 41, the star-shaped dust valve 2 42 will uniformly feed the mixed powder into the screw conveyor 1 43, then the screw conveyor 1 43 will transport the mixed powder to the pre-press 5, then the pre-press 5 will pre-press the mixed powder once, so as to improve the control of reasonable linear pressure and improve the structure strength of the powder, after pre-pressing, the pre-press 5 will transport the pre-pressed particles to the crusher 6, the crusher 6 will crush the pre-pressed powder into 0-5mm particles as secondary ball pressing raw material, so as to reduce the fluidity of the secondary ball pressing raw material, improve the bulk density and optimize the particle size distribution, then the crusher 6 will transport the secondary ball pressing raw material to the screw conveyor 2 61, the screw conveyor 2 61 will transport the secondary ball pressing raw material to the bucket elevator 2 62, then the bucket elevator 2 62 will transport the secondary ball pressing raw material to the FU chain conveyor 2 63, the FU chain conveyor 2 63 will transport the secondary ball pressing raw material to the intermediate bin 7, the intermediate bin 7 will transport the secondary ball pressing raw material to the star-shaped dust valve 3 72 through the plug valve 3 71, then the star-shaped dust valve 3 72 will uniformly feed the secondary ball pressing raw material into the screw conveyor 3 73, the screw conveyor 3 73 will transport the secondary ball pressing raw material to the ball press 8, then the ball press 8 will realize high-efficiency and high-strength ball pressing of the secondary ball pressing raw material, after that, the ball press 8 will transport the pressed pellets to the belt conveyor 2 81, then the belt conveyor 2 81 will transport the pressed pellets to the bucket elevator 3 82, the bucket elevator 3 82 will transport the pressed pellets to the drum screen 9, the drum screen 9 will screen the pressed pellets, then the drum screen 9 will transport the unqualified products screened out to the aggregate bin 1 for recycling, at the same time, the drum screen 9 will transport the qualified products screened out to the finished product bin 10.

[0042] The above merely describes preferred embodiments of the present application, and any modification or equivalent substitution of the technical solutions described above can be made by those skilled in the art according to the present application. Therefore, any simple modification or equivalent substitution made according to the technical solutions of the present application is within the scope of the present application.

Claims

1. A calcium oxide powder circulating ball pressing system for calcium carbide slag calcination, comprising an aggregate bin (1), a powder bin (2), a mixing device (3), a pre-pressing powder bin (4), a pre-pressing machine (5), a pulverizer (6), an intermediate bin (7), a ball pressing machine (8), a drum screen (9), and a finished product bin (10), characterized in that: The aggregate bin (1) and the powder bin (2) are connected with plug valve one (21) at the discharge port, the plug valve one (21) is connected with star-shaped dust valve one (22) at the discharge port, the star-shaped dust valve one (22) is connected with screw scale (23) at the discharge port, the screw scale (23) is connected with the mixing device (3) at the discharge port, the mixing device (3) is connected with belt conveyor one (31) at the discharge port, the belt conveyor one (31) is connected with bucket elevator one (32) at the discharge port, the bucket elevator one (32) is connected with FU chain conveyor one (33) at the discharge port, the FU chain conveyor one (33) is connected with the pre-pressing powder bin (4) at the discharge port, the pre-pressing powder bin (4) is connected with plug valve two (41) at the discharge port, the plug valve two (41) is connected with star-shaped dust valve two (42) at the discharge port, the star-shaped dust valve two (42) is connected with screw conveyor one (43) at the discharge port, the screw conveyor one (43) is connected with the pre-pressing machine (5) at the discharge port, the pre-pressing machine (5) is connected with the pulverizer (6) at the discharge port, the pulverizer (6) is connected with screw conveyor two (61) at the discharge port, the screw conveyor two (61) is connected with bucket elevator two (62) at the discharge port, the bucket elevator two (62) is connected with FU chain conveyor two (63) at the discharge port, the FU chain conveyor two (63) is connected with the intermediate bin (7) at the discharge port, the intermediate bin (7) is connected with plug valve three (71) at the discharge port, the plug valve three (71) is connected with star-shaped dust valve three (72) at the discharge port, the star-shaped dust valve three (72) is connected with screw conveyor three (73) at the discharge port, the screw conveyor three (73) is connected with the ball pressing machine (8) at the discharge port, the ball pressing machine (8) is connected with belt conveyor two (81) at the discharge port, the belt conveyor two (81) is connected with bucket elevator three (82) at the discharge port, the bucket elevator three (82) is connected with the drum screen (9) at the discharge port, the drum screen (9) is connected with the aggregate bin (1) at the discharge port of undersize, and the drum screen (9) is connected with the finished product bin (10) at the discharge port of oversize.

2. The calcium oxide powder system for circulating and balling of calcium carbide slag by calcination according to claim 1, characterized in that: The drum screen (9) is provided with variable frequency speed regulation, and the proportion of undersize of the drum screen (9) can be adjusted by adjusting the rotating speed of the drum screen (9) and the screen aperture.

3. The calcium oxide powder system for circulating and balling of calcium carbide slag by calcination according to claim 1, characterized in that: The screen aperture of the drum screen (9) is 6-10 mm.

4. The calcium carbide slag calcined calcium oxide powder circulating ball pressing system according to claim 1, characterized in that: The drum screen (9) is connected with the finished product bin (10) at the discharge port.

5. The calcium carbide slag calcined calcium oxide powder circulating ball pressing system according to claim 1, characterized in that: The aggregate bin (1) and the powder bin (2) are provided with bag dust collector one (24) at the inlet, the pre-pressing powder bin (4) is provided with bag dust collector two (44) at the inlet, and the intermediate bin (7) is provided with bag dust collector three (74) at the inlet.

6. A process for the production of calcium oxide briquettes from calcium carbide slags, characterized in that: The method comprises the following steps: S1, the calcined calcium oxide powder is transported to the powder bin (2), and the aggregate from the aggregate bin (1) is transported to the mixing device (3) through the screw scale (23) for fully mixing; S2, after mixing, the powder is transported to the pre-pressing powder bin (4), and then transported to the pre-pressing machine (5) through the screw conveyor one (43) for primary pre-pressing, reasonable linear pressure is controlled, and the structure strength of the powder is improved; S3, after pre-pressing, the granular material is transported to the crusher (6) for crushing as secondary ball pressing raw material, reducing the flowability of the secondary ball pressing raw material, improving the bulk density, and optimizing the particle size distribution; S4, the secondary ball pressing raw material is transported to the intermediate bin (7), and then transported to the ball press (8) through the screw conveyor three (73) to realize high-efficiency and high-strength ball pressing; S5, after pressing, the pellets are transported to the drum screen (9) for screening, and the qualified finished products enter the finished product bin (10), and the undersize material is transported to the aggregate bin (1) for recycling.

7. A process for the production of calcium oxide briquettes from calcium carbide slags according to claim 6, characterized in that: In S1, the screened material before entering the calcium carbide furnace is used as aggregate, and after stable production, the undersize material of the drum screen (9) is gradually used as aggregate.

8. A process for the production of calcium oxide powder by the calcination of calcium carbide slags, according to claim 6, characterized in that: The aggregate and powder in S1 account for no less than 3:

7.

9. A process for the production of calcium oxide powder by the calcination of calcium carbide slags, according to claim 6, characterized in that: In S3, the pre-pressed granular material is crushed into 0-5mm particles by the crusher (6).

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