Phosphorus sludge ash and ground phosphate rock mixed pelletizing process and production equipment thereof

Abstract

The invention relates to the technical field of phosphorus sludge recycling, in particular to a phosphorus sludge ash and ground phosphate rock mixed pelletizing process and production equipment thereof. Processing auxiliary materials; processing and premixing; pelletizing and mixing phosphorus mud; drying the phosphorus mud balls; discharging a finished product; in the processing raw material proportioning step, ground phosphate rock, phosphorus sludge ash and dedusting powder are put into a mixing tank in proportion from an independent stock bin through an electronic metering conveyor belt to be premixed; the processing auxiliary material preparation comprises the following steps: proportionally adding phosphoric acid, sludge acid, tail gas acid, humic acid and aluminum hydroxide into a pre-mixing machine to prepare auxiliary materials and mix the auxiliary materials with raw materials; after the raw materials and the auxiliary materials are proportioned, mixing the phosphorus mud raw materials through a double-shaft mixing machine; after being mixed, the raw materials enter a ball pressing machine to be pressed into phosphorus mud balls; the device is simple in structure and convenient to store, detect and sample, solves the problem that phosphorite powder and phosphorus sludge ash generated in the yellow phosphorus production process cannot be directly fed into a furnace for use, and achieves the purposes of turning waste into wealth, reducing the production cost of enterprises and improving economic benefits.

Description

Technical Field

[0001] The invention relates to the technical field of phosphorus mud recycling, and in particular to a process for making balls by mixing phosphorus mud ash and phosphorus rock powder and a production device thereof. Background Art

[0002] A large amount of phosphate rock powder and mud phosphate ash will be generated during the production of yellow phosphorus. The phosphate rock powder produced cannot be directly put into the furnace for use. It is collected by bag dust collectors and stored in the phosphate rock powder yard, and then sold at a low price. There is still phosphorus pentoxide in the mud phosphate ash produced after the mud phosphorus is steamed in a rotary pot. At present, the company mixes this part of the mud phosphate ash with phosphate rock in proportion and puts it directly into the furnace for use. When it is used, the dust on site is relatively large, which has a certain impact on the stable operation of the yellow phosphorus electric furnace. The phosphate rock powder produced by phosphate rock in the production process of yellow phosphorus (including the phosphate rock powder contained in itself and the phosphate rock powder produced during drying, screening, transportation, etc.) accounts for 12.5% ​​to 17.5%. Therefore, some phosphate rock powder cannot be directly put into the furnace for use, which directly causes the loss of raw phosphate ore, and ultimately leads to increased raw material consumption, increased production costs, and increased dust in the production environment. In addition, the sludge phosphorus dry ash produced after the sludge phosphorus is evaporated was previously mixed with phosphate rock and then fed into the phosphorus furnace for phosphorus production. However, a dust collector was designed during the transportation process, resulting in the sludge phosphorus dry ash with smaller particle size being collected by the dust collector and not entering the phosphorus furnace, resulting in the sludge phosphorus dry ash not being 100% utilized; at the same time, the sludge phosphorus dry ash entering the phosphorus furnace will cause fluctuations in the process parameters of the electric furnace, increase the probability of material collapse in the phosphorus furnace, and affect the normal production of the phosphorus furnace; refer to CN103964404B for the method of producing phosphate rock powder balls using phosphate rock powder; design a set of equipment that can fully utilize the recycled phosphorus sludge ash and tailings slag for balling and then stably burn. Summary of the invention

[0003] The purpose of the present invention is to provide a process for making pellets by mixing mud phosphate ash and phosphate rock powder and its production equipment, so as to solve the problem that phosphate rock powder and mud phosphate ash produced in the yellow phosphorus production process cannot be directly put into the furnace for use, thereby achieving the purpose of turning waste into treasure, reducing the production cost of the enterprise and improving the economic benefit.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] 1. A process for making balls by mixing phosphate ash and phosphate rock powder, characterized in that it comprises the following steps:

[0006] 1) Processing raw materials and ingredients;

[0007] 2) Processing auxiliary materials and ingredients;

[0008] 3) Processing pre-mixing;

[0009] 4) Phosphorus mud ball making and mixing;

[0010] 5) Drying of phosphorus mud balls;

[0011] 6) Finished product discharge.

[0012] Further, the processing raw materials include phosphate rock powder, mud phosphate ash and dust removal powder;

[0013] The processing auxiliary materials include phosphoric acid, slag acid, tail gas acid, humic acid and aluminum hydroxide.

[0014] further,

[0015] ① The raw material batching process involves feeding phosphate rock powder, mud phosphorus ash and dust removal powder from independent silos into a mixing tank in proportion through an electronic metering conveyor belt for premixing;

[0016] ② The processing auxiliary materials are added into the pre-mixing machine according to the proportion to mix the auxiliary materials with the raw materials;

[0017] ③After the raw materials and auxiliary materials are proportioned, the phosphorus mud raw materials are mixed by a double-shaft mixer;

[0018] ④After the raw materials are mixed, they enter the briquetting machine to press the phosphorus mud balls;

[0019] ⑤ The phosphorus mud balls formed by the ball press enter the drying tower for drying and shaping;

[0020] ⑥ The phosphorus mud balls are dried, shaped and transported to the finished product warehouse for storage, which is convenient for storage and testing and sampling;

[0021] Further, it includes a fixed frame, a first driving motor, a reducer, a stirring mechanism and a pill-making mechanism, characterized in that: the fixed frame is a rectangular frame structure, and the upper part of the fixed frame is provided with a stirring mechanism, the stirring mechanism includes a stirring box, a spiral guide rod, a receiving plate and a spray pipe, the interior of the stirring box is provided with a material guide trough and a spiral guide rod, and one end of the spiral guide rod is connected to the reducer and the first driving motor through a bearing seat, the upper part of the stirring box is provided with a rectangular connecting port and a receiving plate, and the upper part of the receiving plate is provided with a spray pipe; one end of the stirring box is connected to the pill-making mechanism through a feeding bracket; the pill-making mechanism includes a material guide box, a ball pressing group, a loading platform, a second feeding hopper and a spiral stirring rod, the upper part of the material guide box is provided with a feeding port, and the interior of the material guide box is provided with a ball pressing group, the upper part of the feed port is provided with a loading platform and a second feeding hopper, and the second feeding hopper is provided with a spiral stirring rod;

[0022] The second feed hopper is arranged on the upper part of the loading platform, and a support frame is arranged on the upper part of the loading platform, a second drive motor and a spiral stirring rod connected to the second drive motor are arranged on the upper part of the support frame, and the spiral stirring rod extends into the second feed hopper; a conveying platform is arranged at the lower part of the material guide box, and a second conveyor belt is arranged inside the conveying platform;

[0023] The ball pressing group includes a first pressing roller, a second pressing roller and a driving box, wherein the first pressing roller and the second pressing roller are symmetrically arranged inside the feed port, and one end of the first pressing roller and the second pressing roller are connected to the driving box through a connector;

[0024] The drive box is provided with a first gear connected to the first nip roller and a second gear connected to the second nip roller inside, and the first gear and the second gear are meshed and connected; the drive box is provided with a third drive motor outside, and the third drive motor is connected to the first nip roller through a coupling;

[0025] The first nip roller and the second nip roller are provided with a plurality of through holes on their upper parts;

[0026] One side of the second feed hopper is connected to one end of the feed bracket through a feed chute, the other end of the feed bracket extends into the interior of the fixed frame and is connected to the discharge port of the mixing box, and a first conveyor belt is provided on the upper part of the feed bracket;

[0027] The receiving plate is movably connected to the slide bar on the inner wall of the rectangular connection port through the rectangular slide grooves on both sides, and a fixing screw is provided on one side of the rectangular connection port;

[0028] A first feeding hopper is arranged at one end of the mixing box.

[0029] Furthermore, it includes a drying tower body, a feeding conveyor belt, a drying conveyor belt, a discharging conveyor belt, a drying air inlet duct, and a drying tail gas pipe; the top of the drying tower body is connected to a feeding conveyor belt; one end of the feeding conveyor belt is connected to a pill making device; the other end of the feeding conveyor belt is connected to a drying conveyor belt arranged inside the drying tower body; the drying conveyor belt is arranged downward in a spiral shape; a discharging conveyor belt is connected to the bottom of the drying conveyor belt; the bottom of the drying tower body is arranged above the drying air inlet duct; a drying tail gas pipe is arranged on the top of the drying tower body; a vertically arranged drying cylinder is arranged inside the drying tower body; the drying cylinder is arranged on the inner side of the drying conveyor belt, and a drying cylinder air inlet is arranged at the bottom of the drying cylinder; the drying cylinder air inlet is a symmetrical double-port structure; a guide cone is arranged inside the drying cylinder air inlet; drying air holes are arranged on the surface of the drying cylinder; the drying air holes are respectively arranged at the bottom and upper part of the drying conveyor belt; the drying air holes are arranged inclined with the drying conveyor belt.

[0030] Furthermore, air inlet A and air inlet B are respectively provided at both ends of the drying air inlet duct; air inlet A is a hot air boiler; and air inlet B is connected to the phosphorus furnace tail gas hot air furnace.

[0031] Compared with the prior art, the present invention can achieve one of the following beneficial effects:

[0032] An industrial production method for preparing pellets by mixing phosphate ash and phosphate rock powder comprises the following steps:

[0033] 1) Transportation of phosphate rock powder and mud phosphate ash: Pneumatic conveying equipment is used to transport mud phosphate ash and phosphate rock powder to three silos (including mud phosphate ash silo, coarse phosphate rock powder silo, and fine phosphate rock powder silo).

[0034] 2) Batching: The materials are discharged from the electronic belt scales at the bottom of the three silos in proportion to the mixing belt. In order to ensure the uniformity of the mixing and the stability of the production load, the present invention is also provided with a mixing bin for mixing the mixing belt and the dust recovered from the environment as evenly as possible. At the same time, a matching star-shaped feeder and an electronic metering belt scale are arranged at the bottom of the mixing bin to ensure the stability of the production load.

[0035] The material preparation ratio of the present invention is coarse phosphate rock powder: fine phosphate rock powder: mud phosphorus ash = 10-30:10:1.

[0036] 3) Adding adhesive: Add the prepared adhesive to the double-shaft stirrer through an adhesive feed pump to achieve full and uniform mixing of the adhesive with phosphate rock powder and mud apatite. In order to ensure full and uniform mixing of the adhesive with phosphate rock powder and mud apatite, the present invention is provided with two-stage stirring, and adhesive adding ports are provided in both stages of stirring, which can fully achieve full mixing of the raw material powder and the adhesive.

[0037] 4) Phosphate rock powder and phosphorus mud ash pelletizing: Phosphate rock powder and phosphorus mud powder after adding adhesive are conveyed to the pelletizing machine through a belt. The pelletizing machine is a complete set of equipment equipped with a pelletizing mold. After being pressed into balls by the pelletizing machine, wet pellets with a particle size of 30-32 mm are obtained. The wet pellets are conveyed to the vibrating screen through a belt conveyor. The vibrating screen will screen out the unqualified pellets and return them to the double-shaft agitator through a belt conveyor to continue the cycle of pelletizing; qualified wet pellets are sent to the next stage for processing.

[0038] 5) Pellet drying: The drying machine used is a tower dryer. It includes an exhaust hot air furnace, a blower, a drying tower and an induced draft fan. The tail gas from the phosphorus furnace produced by yellow phosphorus production is converted into heat after being burned in the exhaust hot air furnace. The hot air is then added to the tower dryer through the blower for countercurrent direct contact heat exchange with the wet pellets in the tower dryer. The waste gas after heat exchange is dedusted by a bag filter and then led to the chimney through an induced draft fan to meet the emission standards;

[0039] The feeding method of the tower dryer is top-in and bottom-out, the temperature of the hot air furnace is 320-400℃, the temperature of the drying tower is ≥200℃, the residence time is 3-4 hours, and the residence time is controlled by the frequency conversion of the discharge device at the bottom of the drying tower. In addition, the drying tower is equipped with four temperature monitoring points and two material level monitoring points.

[0040] After drying, the pellets are screened by a vibrating screen, and unqualified pellets and powder are returned to the mixing bin by pneumatic conveying for recycling; qualified pellets are sent to the finished product warehouse for storage and use by a belt conveyor. The pellet product indicators include: P2O5, SiO2, CaO, CO2, moisture, particle size (≤3mm proportion) and drum mechanical strength;

[0041] Process control of the present invention: The equipment selected in the present invention can realize DCS centralized control, and is equipped with a one-key start-up system, a one-key stop system, a precise batching system, an automatic adhesive addition system, and a high-low interlocking system for the material levels of each tower and tank. The operation process has a high degree of automation and high safety.

[0042] 2. In steps 3 to 5, the phosphate rock powder and phosphate rock powder mud and phosphate ash mixture are all conveyed by belt conveyor. During the conveying process, especially at the material dropping points of each conveyor belt, dust will be generated, which has a great impact on the production environment. At the same time, it increases the labor intensity of workers handling the falling materials. Therefore, the conveying method of this device has some improvements, such as using screw conveyor, silo pump conveyor and other methods.

[0043] In step 5, the pellet drying adopts phosphorus furnace tail gas combustion as a heat source. The phosphorus furnace tail gas used in this method is not deeply purified and still contains some impurities. As the use time increases, the tail gas pipeline and the hot blast furnace burner will be blocked, resulting in abnormal operation of the hot blast furnace, thereby affecting the drying temperature and ultimately affecting the pellet product quality. Therefore, it is required to use a tail gas pressure greater than 0.4KPa and a burner cleaning cycle of 3 to 4 days / times. Therefore, if the phosphorus furnace tail gas used can be purified and cleaned, the device operation stability and process index qualification rate will be greatly improved.

[0044] 3. A phosphorus mud recovery pill making device; comprising a fixed frame, a first driving motor, a reducer, a stirring mechanism and a pill making mechanism, characterized in that: the fixed frame is a rectangular frame structure, and the upper part of the fixed frame is provided with a stirring mechanism, the stirring mechanism comprises a stirring box, a spiral guide rod, a receiving plate and a spray pipe, the interior of the stirring box is provided with a material guide trough and a spiral guide rod, and one end of the spiral guide rod is connected to the reducer and the first driving motor through a bearing seat, the upper part of the stirring box is provided with a rectangular connecting port and a receiving plate, and the upper part of the receiving plate is provided with a spray pipe; one end of the stirring box is connected to the pill making mechanism through a feeding bracket; the pill making mechanism comprises a material guide box, a ball pressing group, a loading platform, a second feeding hopper and a spiral stirring rod, the upper part of the material guide box is provided with a feeding port, and the interior of the material guide box is provided with a ball pressing group, the upper part of the feed port is provided with a loading platform and a second feeding hopper, and the second feeding hopper is provided with a spiral stirring rod;

[0045] The second feed hopper is arranged on the upper part of the loading platform, and a support frame is arranged on the upper part of the loading platform, a second drive motor and a spiral stirring rod connected to the second drive motor are arranged on the upper part of the support frame, and the spiral stirring rod extends into the second feed hopper; a conveying platform is arranged at the lower part of the material guide box, and a second conveyor belt is arranged inside the conveying platform;

[0046] The ball pressing group includes a first pressing roller, a second pressing roller and a driving box, wherein the first pressing roller and the second pressing roller are symmetrically arranged inside the feed port, and one end of the first pressing roller and the second pressing roller are connected to the driving box through a connector;

[0047] The drive box is provided with a first gear connected to the first nip roller and a second gear connected to the second nip roller inside, and the first gear and the second gear are meshed and connected; the drive box is provided with a third drive motor outside, and the third drive motor is connected to the first nip roller through a coupling;

[0048] The first nip roller and the second nip roller are provided with a plurality of through holes on their upper parts;

[0049] One side of the second feed hopper is connected to one end of the feed bracket through a feed chute, the other end of the feed bracket extends into the interior of the fixed frame and is connected to the discharge port of the mixing box, and a first conveyor belt is provided on the upper part of the feed bracket;

[0050] The receiving plate is movably connected to the slide bar on the inner wall of the rectangular connection port through the rectangular slide grooves on both sides, and a fixing screw is provided on one side of the rectangular connection port;

[0051] A first feed hopper is provided at one end of the mixing box;

[0052] The stirring mechanism can be arranged on the upper part of the fixed frame, and the material can be introduced through the stirring box, and the spiral guide rod inside is driven by the first driving motor to guide and stir the material, and a rectangular connecting port is arranged on the upper part of the stirring box for connecting the receiving plate, and the atomized water stains are sprayed into the receiving plate through the spray pipe on the upper part of the receiving plate, so as to facilitate the wetting of the internal material, and the interval between the receiving plate and the internal material can be adjusted by the fixing screw, which is convenient for use; one end of the fixed frame is connected to the pill-making mechanism through the feeding bracket, and the material is pressed into pills by the pressing group inside the guiding box, and then received and fed by the conveying platform at the lower part, and the work efficiency is effectively improved by integrating humidification, stirring, feeding and pill-making.

[0053] 4. A phosphorus mud pill-making drying tower, comprising a drying tower body, a feeding conveyor belt, a drying conveyor belt, a discharging conveyor belt, a drying air inlet duct, and a drying tail gas pipe; the top of the drying tower body is connected with a feeding conveyor belt; one end of the feeding conveyor belt is connected to a pill-making device; the other end of the feeding conveyor belt is connected to a drying conveyor belt arranged inside the drying tower body; the drying conveyor belt is spirally arranged downward; the bottom of the drying conveyor belt is connected with a discharging conveyor belt; the bottom of the drying tower body is arranged above the drying air inlet duct; the top of the drying tower body is provided with a drying tail gas pipe; a vertically arranged drying cylinder is arranged inside the drying tower body; the drying cylinder is arranged on the inner side of the drying conveyor belt, and after the pill-making equipment is completed, the phosphorus mud pills can be quickly dried by the drying tower. The efficiency of traditional drying towers is very low, and the required drying time is relatively long. Through the spiral drying conveyor belt in the present technology, the rotation and conveying speed of the drying conveyor belt is controlled by a numerical control system, so that the drying time of the phosphorus mud pills staying in the drying tower can be conveniently adjusted, thereby improving the drying efficiency; and the drying cylinder is provided to provide drying gas with maximum heat for each layer of the spiral drying conveyor belt, so that the drying speed can be effectively improved.

[0054] 5. A drying drum air inlet is arranged at the bottom of the drying drum; the drying drum air inlet is a symmetrical double-port structure; a guide cone is arranged inside the drying drum air inlet; drying air holes are arranged on the surface of the drying drum; the drying air holes are arranged at the bottom and the upper part of the drying conveyor belt respectively; the drying air holes are arranged inclined with the drying conveyor belt, and the drying air holes arranged at the top and the bottom of the drying conveyor belt can increase the gas flow rate on the surface of the drying conveyor belt, thereby improving the drying efficiency and shortening the drying time.

[0055] 6. An air inlet A and an air inlet B are respectively provided at both ends of the drying air inlet duct; air inlet A is a hot air boiler; air inlet B is connected to the hot air furnace for tail gas from the phosphorus furnace. By setting up a double-channel drying air inlet duct, it is possible to utilize the tail gas from the phosphorus furnace while also using the high-temperature drying gas increased by the hot air boiler to ensure the drying temperature in the drying tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 It is a schematic diagram of the process flow of the present invention.

[0057] Figure 2 It is a schematic diagram of the structure of the phosphorus mud recovery and pelletizing device of the present invention.

[0058] Figure 3 It is a schematic diagram of the structure of the phosphorus mud recovery and pelletizing device of the present invention.

[0059] Figure 4 It is a partial structural schematic diagram of the stirring mechanism of the present invention.

[0060] Figure 5 It is a partial structural schematic diagram of the pill making mechanism of the present invention.

[0061] Figure 6 It is a partial structural schematic diagram of the drive box of the present invention.

[0062] Figure 7 It is a schematic diagram of the structure of the pill making and drying tower of the present invention.

[0063] Figure 8 This is a schematic diagram of the drying air intake structure of the present invention.

[0064] Fig. 9 This is a schematic diagram of the air inlet structure of the drying drum of the present invention.

[0065] Figure numerals: 1-fixed frame, 2-first drive motor, 3-reducer, 4-bearing seat, 5-pill making mechanism, 6-mixing box, 7-feeding bracket, 8-first conveyor belt, 51-material guide box, 52-feeding port, 53-drive box, 54-third drive motor, 55-first pressing roller, 56-second pressing roller, 57-conveying platform, 58-second conveyor belt, 59-loading platform, 61-rectangular connecting port, 62-slide bar, 63-fixing screw, 64-spray pipe, 65-undertaking Plate, 66- spiral guide rod, 67- first feed hopper, 70- material trough, 71- spiral stirring rod, 72- support frame, 73- second feed hopper, 74- second drive motor, 9- drying tower body, 901- feeding conveyor belt, 902 drying conveyor belt, 903- discharging conveyor belt, 904- drying air inlet, 905- drying tail pipe, 906- drying cylinder, 9041- air inlet A, 9042- air inlet B, 9061- drying cylinder air inlet, 9062- drying air hole. DETAILED DESCRIPTION

[0066] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0067] Example 1

[0068] ① The raw material batching process involves feeding phosphate rock powder, mud phosphorus ash and dust removal powder from independent silos into a mixing tank in proportion through an electronic metering conveyor belt for premixing;

[0069] ② The processing auxiliary materials are added into the pre-mixing machine according to the proportion to mix the auxiliary materials with the raw materials;

[0070] ③After the raw materials and auxiliary materials are proportioned, the phosphorus mud raw materials are mixed by a double-shaft mixer;

[0071] ④After the raw materials are mixed, they enter the briquetting machine to press the phosphorus mud balls;

[0072] ⑤ The phosphorus mud balls formed by the ball press enter the drying tower for drying and shaping;

[0073] ⑥ The phosphorus mud balls are dried, shaped and transported to the finished product warehouse for storage, which is convenient for storage and testing and sampling;

[0074] The industrialized production method of mixing phosphate ash and phosphate rock powder to make pellets can be realized in the present invention. It is scientific and reliable, the production process has a high degree of automation, the pellet product quality is stable and balanced, and the raw material index requirements for entering the furnace are met. After being used with phosphate rock, there is no abnormal effect on the electric furnace process parameters. The present invention can effectively solve the problem that phosphate rock powder and phosphate ash generated in the yellow phosphorus production process cannot be directly used in the furnace, achieving the purpose of turning waste into treasure, reducing enterprise production costs, and improving economic benefits. The quality indicators of the pellet products produced by this method are as follows:

[0075]

[0076] Example 2

[0077] On the basis of Example 1, a phosphorus mud recovery pilling device includes a fixed frame 1, a first drive motor 2, a reducer 3, a stirring mechanism and a pilling mechanism 5, wherein the fixed frame 1 is a rectangular frame structure, and the upper part of the fixed frame 1 is provided with a stirring mechanism, and the stirring mechanism includes a stirring box 6, a spiral guide rod 66, a receiving plate 65 and a spray pipe 64, and the interior of the stirring box 6 is provided with a guide trough and a spiral guide rod 66, and one end of the spiral guide rod 66 is connected to the reducer 3 and the first drive motor 2 through a bearing seat 4, and the upper part of the stirring box 6 is provided with A rectangular connecting port 61 and a receiving plate 65 are provided, and a spray pipe 64 is provided on the upper part of the receiving plate 65; one end of the mixing box 6 is connected to the pill making mechanism 5 through a feeding bracket 7; the pill making mechanism 5 includes a material guide box 51, a ball pressing group, a loading platform 59, a second feed hopper 73 and a spiral stirring rod 71, a material guide box 51 is provided with a material feed port 52 on the upper part, and a ball pressing group is provided inside the material guide box (51), a loading platform 59 and a second feed hopper 73 are provided on the upper part of the material feed port 52, and a spiral stirring rod 71 is provided inside the second feed hopper 73.

[0078] It should be noted that a large amount of mud phosphorus will inevitably be produced during the production of yellow phosphorus. Mud phosphorus is generally a mixture of mud phosphorus ash and phosphate rock powder. In the mud phosphorus pre-wetting balling technology, in order for the mud phosphorus ash to be made into pills, it needs to be humidified, stirred and transported in advance. In the existing factory, each step is prepared in an independent working area, which leads to a high material transportation cost. Therefore, we have designed an integrated mud phosphorus ash preparation pilling mechanism, wherein, after the mud phosphorus ash is introduced into the interior of the mixing box 6, it is guided by a spiral guide rod 66. During the guiding process, the mud phosphorus ash inside is stirred to realize the integration of feeding and transportation. In addition, for the convenience of humidification, a rectangular opening is designed on the upper part of the mixing box 6, and a rectangular connecting port 61 and a receiving plate 65 are arranged on the upper part of the rectangular opening. The receiving plate 65 is movably arranged inside the rectangular connecting port 61, and a plurality of spray pipes 64 are arranged on the upper part of the receiving plate 65. The spray head of the spray pipe 64 extends into the interior of the chamber of the mixing box 6 for humidifying the material.

[0079] It should be further explained that, in order to realize the integration of the pelletizing process, one end of the mixing box 6 is connected to the pelletizing mechanism 5 through the feeding bracket 7, and the moistened mud apatite is pressed into pellets by the pelletizing group inside the guide box 51.

[0080] The second feed hopper 73 is arranged on the upper part of the loading platform 59, and a support frame 72 is arranged on the upper part of the loading platform 59, a second drive motor 74 and a spiral stirring rod 71 connected to the second drive motor 74 are arranged on the upper part of the support frame 72, and the spiral stirring rod 71 extends into the second feed hopper 73; a conveying platform 57 is arranged at the lower part of the material guide box 51, and a second conveyor belt 58 is arranged inside the conveying platform 57.

[0081] It should be noted that during the feeding and pressing process of mud phosphate ash, the feed port may be blocked. In order to solve this technical problem, a support frame 72 is set on the upper part of the stage 59, and the spiral stirring rod 71 on the upper part of the support frame 72 extends into the second feed hopper 73 to the ball pressing group. It rotates during the feeding process to prevent material accumulation and avoid blockage.

[0082] The ball pressing group includes a first pressing roller 55, a second pressing roller 56 and a driving box 53, wherein the first pressing roller 55 and the second pressing roller 56 are symmetrically arranged inside the feed port 52, and one end of the first pressing roller 55 and the second pressing roller 56 are connected to the driving box 53 through a connector; a first gear 76 connected to the first pressing roller 55 and a second gear 76 connected to the second pressing roller 56 are arranged inside the driving box 53, and the first gear 76 and the second gear 76 are meshed and connected; a third driving motor 54 is arranged outside the driving box 53, and the third driving motor 54 is connected to the first pressing roller 55 through a coupling; a plurality of through holes are arranged on the upper parts of the first pressing roller 55 and the second pressing roller 56.

[0083] It should be noted that the first nip roller 55 and the second nip roller 56 are symmetrically arranged inside the feed port 52 and can be rotated by the drive box 53. During the rotation, the wet mud apatite ash is pressed into pills through the through holes on the upper parts of the first nip roller 55 and the second nip roller 56, and collected and transported through the lower conveying platform 57, thereby realizing automated pill making.

[0084] One side of the second feed hopper 73 is connected to one end of the feeding bracket 7 through the feeding chute 70 , and the other end of the feeding bracket 7 extends into the interior of the fixing frame 1 and is connected to the discharge port of the mixing box 6 . A first conveyor belt 8 is provided on the upper part of the feeding bracket 7 .

[0085] It should be noted that the feeding bracket 7 is used to feed the wet and stirred mud apatite into the material guide box 51, playing a role of transportation.

[0086] The receiving plate 65 is movably connected to the slide bar 62 on the inner wall of the rectangular connecting opening 61 through the rectangular sliding grooves on both sides, and a fixing screw 63 is provided on one side of the rectangular connecting opening 61; a first feed hopper 67 is provided at one end of the mixing box 6.

[0087] It should be noted that the receiving plate 65 is adjustable in design, so that the distance between the upper spray head of the spray pipe 64 and the material inside the mixing box 6 can be adjusted as needed, thereby adjusting the spraying distance. The purpose of this setting is that we generally use atomization when spraying and moistening. The closer the spray point is to the material, the less likely the atomized gas will dissipate.

[0088] Example 3

[0089] On the basis of Example 1, it includes a drying tower body 9, a feeding conveyor belt 901, a drying conveyor belt 902, a discharging conveyor belt 903, a drying air inlet duct 904, and a drying tail gas pipe 905; the top of the drying tower body 9 is connected with a feeding conveyor belt 901; one end of the feeding conveyor belt 901 is connected to a pill making device; the other end of the feeding conveyor belt 901 is connected to a drying conveyor belt 902 arranged inside the drying tower body 9; the drying conveyor belt 902 is arranged downward in a spiral shape; the bottom of the drying conveyor belt 902 is connected with a discharging conveyor belt 903; the bottom of the drying tower body 9 is arranged above the drying air inlet duct 904; the top of the drying tower body 9 is provided with a drying Tail pipe 905; a drying cylinder 906 is vertically arranged inside the drying tower body 9; the drying cylinder 906 is arranged on the inner side of the drying conveyor belt 902, and can quickly dry the phosphorus mud pills through the drying tower after the pill making equipment is completed. The efficiency of traditional drying towers is low and the required drying time is long. Through the spiral drying conveyor belt in this technology, the rotation and conveying speed of the drying conveyor belt is controlled by the CNC system, and the drying time of the phosphorus mud pills staying in the drying tower can be conveniently adjusted to improve the drying efficiency; and the drying cylinder is provided to provide drying gas with maximum heat for each layer of the spiral drying conveyor belt, which can effectively improve the drying speed.

[0090] Example 4

[0091] On the basis of Example 1, a drying cylinder air inlet 9061 is arranged at the bottom of the drying cylinder 906; the drying cylinder air inlet 9061 is a symmetrical double-port structure; a guide cone is arranged inside the drying cylinder air inlet 9061; drying air holes 9062 are arranged on the surface of the drying cylinder 906; the drying air holes 9062 are respectively arranged at the bottom and the upper part of the drying conveyor belt 902; the drying air holes 9062 are arranged obliquely with the drying conveyor belt 902, and the drying air holes arranged at the top and bottom of the drying conveyor belt can increase the gas flow rate on the surface of the drying conveyor belt, improve the drying efficiency, and shorten the drying time.

[0092] Example 5

[0093] On the basis of Example 1, the two ends of the drying air inlet 904 are respectively provided with an air inlet A9041 and an air inlet B9042; the air inlet A9041 is a hot air boiler; the air inlet B9042 is connected to the phosphorus furnace exhaust hot air furnace, so that by setting a dual-channel drying air inlet duct, it is possible to utilize the phosphorus furnace exhaust gas while using the high-temperature drying gas increased by the hot air boiler to ensure the drying temperature in the drying tower.

[0094] Although the present invention is described herein with reference to a number of illustrative embodiments of the present invention, it will be appreciated that those skilled in the art may devise many other modifications and implementations that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure, drawings, and claims, a variety of variations and modifications may be made to the components and / or layout of the subject combination layout. In addition to the variations and modifications made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A process for making balls by mixing phosphate ash and phosphate rock powder, characterized in that: The following steps are involved: 1) Processing raw materials and ingredients; 2) Processing auxiliary materials and ingredients; 3) Processing pre-mixing; 4) Mud and phosphorus pellets are mixed; 5) Drying of mud phosphorus balls; 6) Finished product discharge.

2. A process for making balls by mixing phosphate ash and phosphate rock powder according to claim 1, characterized in that: The processing raw materials include phosphate rock powder, mud phosphate ash and dust removal powder; The processing auxiliary materials include phosphoric acid, slag acid, tail gas acid, humic acid and aluminum hydroxide.

3. The process for making balls by mixing phosphate ash and phosphate rock powder according to claim 1, characterized in that: ① The raw material batching process involves feeding phosphate rock powder, mud phosphate ash and dust removal powder from independent silos into a mixing tank in proportion through an electronic metering conveyor belt for premixing; ② The processing auxiliary materials are added into the pre-mixing machine according to the proportion to mix the auxiliary materials with the raw materials; ③After the raw materials and auxiliary materials are proportioned, the phosphorus mud raw materials are mixed by a double-shaft mixer; ④After the raw materials are mixed, they enter the briquetting machine to press the mud phosphorus balls; ⑤ The mud phosphorus balls formed by the ball press enter the drying tower for drying and shaping; ⑥ The mud phosphorus balls are dried, shaped and transported to the finished product warehouse for storage, which is convenient for storage and testing and sampling; 4. The process for making pellets by mixing phosphate ash and phosphate rock powder according to claim 1, characterized in that: The phosphate rock powder in the raw material is composed of two different proportions of coarse and fine phosphate rock powder; the particle size of the coarse phosphate rock powder is 20-30 meshes; the particle size of the fine phosphate rock powder is 1-20 meshes.

5. The equipment for producing balls by mixing phosphate ash and phosphate rock powder according to claim 1, characterized in that: A sludge phosphorus recovery and pelletizing device; comprising a fixed frame (1), a first drive motor (2), a reducer (3), a stirring mechanism and a pelletizing mechanism (5), characterized in that: the fixed frame (1) is a rectangular frame structure, and the upper part of the fixed frame (1) is provided with a stirring mechanism, the stirring mechanism comprises a stirring box (6), a spiral guide rod (66), a receiving plate (65) and a spray pipe (64), the interior of the stirring box (6) is provided with a guide trough and a spiral guide rod (66), and one end of the spiral guide rod (66) is connected to the reducer (3) and the first drive motor (2) through a bearing seat (4), and the upper part of the stirring box (6) is provided with a rectangular A connecting port (61) and a receiving plate (65), and a spray pipe (64) is arranged on the upper part of the receiving plate (65); one end of the mixing box (6) is connected to a pill-making mechanism (5) through a feeding bracket (7); the pill-making mechanism (5) comprises a material guide box (51), a pill-pressing group, a loading platform (59), a second feed hopper (73) and a spiral stirring rod (71); a material guide box (51) is provided with a material feed port (52) on the upper part, and a pill-pressing group is arranged inside the material guide box (51); a loading platform (59) and a second feed hopper (73) are arranged on the upper part of the material feed port (52), and a spiral stirring rod (71) is arranged inside the second feed hopper (73); The second feed hopper (73) is arranged on the upper part of the loading platform (59), and a support frame (72) is arranged on the upper part of the loading platform (59), and a second drive motor (74) and a spiral stirring rod (71) connected to the second drive motor (74) are arranged on the upper part of the support frame (72), and the spiral stirring rod (71) extends into the second feed hopper (73); a conveying platform (57) is arranged on the lower part of the material guide box (51), and a second conveyor belt (58) is arranged inside the conveying platform (57); The ball pressing group comprises a first pressing roller (55), a second pressing roller (56) and a driving box (53), wherein the first pressing roller (55) and the second pressing roller (56) are symmetrically arranged inside the feed port (52), and one end of the first pressing roller (55) and the second pressing roller (56) are connected to the driving box (53) through a connector; The driving box (53) is provided with a first gear (76) connected to the first nip roller (55) and a second gear (76) connected to the second nip roller (56), and the first gear (76) and the second gear (76) are meshingly connected; the driving box (53) is provided with a third driving motor (54) outside, and the third driving motor (54) is connected to the first nip roller (55) via a coupling; A plurality of through holes are provided on the upper parts of the first nip roller (55) and the second nip roller (56); One side of the second feed hopper (73) is connected to one end of the feed bracket (7) through a feed trough (70); the other end of the feed bracket (7) extends into the interior of the fixed frame (1) and is connected to the discharge port of the mixing box (6); a first conveyor belt (8) is provided on the upper part of the feed bracket (7); The receiving plate (65) is movably connected to the slide bar (62) on the inner wall of the rectangular connecting opening (61) through the rectangular sliding grooves on both sides, and a fixing screw (63) is provided on one side of the rectangular connecting opening (61); A first feed hopper (67) is provided at one end of the mixing box (6).

6. The equipment for producing pellets by mixing phosphate ash and phosphate rock powder according to claim 1, characterized in that: It comprises a drying tower body (9), a feeding conveyor belt (901), a drying conveyor belt (902), a discharging conveyor belt (903), a drying air inlet duct (904), and a drying tail gas pipe (905); the top of the drying tower body (9) is connected to the feeding conveyor belt (901); one end of the feeding conveyor belt (901) is connected to a pill making device; The other end of the feed conveyor belt (901) is connected to a drying conveyor belt (902) arranged inside the drying tower body (9); the drying conveyor belt (902) is arranged in a spiral shape and extends downward; a discharge conveyor belt (903) is connected to the bottom of the drying conveyor belt (902); the bottom of the drying tower body (9) is arranged above the drying air inlet duct (904); a drying exhaust pipe (905) is arranged on the top of the drying tower body (9); a drying cylinder (906) is vertically arranged inside the drying tower body (9); and the drying cylinder (906) is arranged on the inner side of the drying conveyor belt (902).

7. The equipment for producing balls by mixing phosphate ash and phosphate rock powder according to claim 6, characterized in that: The bottom of the drying cylinder (906) is provided with a drying cylinder air inlet (9061); the drying cylinder air inlet (9061) is a symmetrical double-inlet structure; a guide cone is provided inside the drying cylinder air inlet (9061); drying air holes (9062) are arranged on the surface of the drying cylinder (906); the drying air holes (9062) are respectively arranged at the bottom and the upper part of the drying conveyor belt (902); and the drying air holes (9062) are arranged obliquely along the drying conveyor belt (902).

8. The equipment for producing pellets by mixing phosphate ash and phosphate rock powder according to claim 6, characterized in that: The two ends of the drying air inlet duct (904) are respectively provided with an air inlet A (9041) and an air inlet B (9042); the air inlet A (9041) is a hot air boiler; the air inlet B (9042) is connected to the phosphorus furnace tail gas hot air furnace.

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