Preparation method of ground phosphate rock drying-free cold-pressed pellets

Abstract

The invention relates to the technical field of phosphorus chemical industry, and discloses a preparation method of ground phosphate rock drying-free cold-pressed pellets, which comprises the following steps: S1, feeding: putting prepared raw ground phosphate rock / washed ground phosphate rock / sintered ground phosphate rock into a stock bin (1) through a forklift for use; compared with the prior art, the drying-free adhesive for the ground phosphate rock pellets has the following advantages and effects that the ground phosphate rock wet pellets subjected to cold press molding after being added with the drying-free adhesive for the ground phosphate rock pellets can be quickly cured after being aired at room temperature, so that the compressive strength of the dry pellets is improved, the thermal stability of furnace charging is improved, the production process is simplified, the energy consumption is reduced, and the molding of the pellets is more stable and controllable; the production efficiency is improved, drying equipment does not need to be added, the equipment investment is reduced, the production cost is reduced, the pellet can replace phosphate ore to be used for producing yellow phosphorus in an electric furnace (submerged arc furnace), the pellet is uniform in particle size, has certain compressive strength and abrasion resistance and good heat resistance, the water content reaches 1% or below, and the power consumption of throwing into the furnace can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of phosphorus chemical industry, and in particular to a method for preparing drying-free cold-pressed pellets of phosphate rock powder. Background Art

[0002] The production of industrial yellow phosphorus by electric furnace method usually requires that the materials such as phosphate rock entering the furnace have a certain particle size range. The size of the charge and the state of the charge at high temperature will directly affect the normal reaction in the electric furnace. Only the charge that meets the requirements can efficiently and stably produce yellow phosphorus and reduce the proportion of mud phosphorus. As phosphate resources are becoming increasingly exhausted and impoverished, the price of rich ore continues to rise. For broken phosphate ore or phosphate rock powder that does not meet the direct feeding requirements, the current common practices are mainly: ① Grinding for phosphate rock fertilizer or for general calcium production, but it is limited by production conditions; ② Sintering and forming. The sintered ore produced by this method has good performance, but its return powder volume is as high as about 40%. Therefore, due to geographical or production capacity restrictions, a large amount of phosphate rock powder is piled up and discarded, which not only increases the cost of yellow phosphorus production, but also a large amount of stockpiled phosphate rock powder cannot be reasonably utilized, which not only occupies a large amount of funds, but also causes waste of resources and pollutes the environment.

[0003] Currently, there are problems of high equipment investment and high production cost in the preparation of cold-pressed pellets of phosphate rock powder without drying. Summary of the invention

[0004] The purpose of the present invention is to provide a method for preparing phosphate rock powder cold-pressed pellets without drying, which can solve the problems raised in the above-mentioned background technology.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: a method for preparing phosphate rock powder drying-free cold-pressed pellets, comprising a silo, a first conveyor belt, a second conveyor belt, an elevator, a mixer, a third conveyor belt and a pellet press, one side of the silo is fixedly connected to a motor, the lower surface of the mixer is fixedly connected to a bracket, one side of the lower surface of the silo is fixedly connected to a discharge pipe, one end of the discharge pipe is provided with a baffle, the lower surface of the third conveyor belt is fixedly connected to a support platform, the interior of the support platform is fixedly connected to a second motor, the output end of the second motor is fixedly connected to a first transmission wheel, and the first transmission wheel is transmission-connected to the second transmission wheel through a conveyor belt.

[0006] By adopting the above technical scheme, the pellet forming rate is high, the wet pellets are dried for 2 to 3 days, the compressive strength reaches more than 100kg in 48 hours, the compressive strength is greater than 80Kg at 0 to 500°C, and the compressive strength is greater than 30Kg at 0 to 900°C, which can meet customer requirements, without adding drying equipment, reducing equipment investment and production costs, and can replace phosphate rock for electric furnace (submersible arc furnace) production of yellow phosphorus. The pellets have uniform particle size, certain compressive strength and wear resistance, good heat resistance, and moisture content below 1%, which can reduce furnace power consumption.

[0007] The present invention is further configured as follows: a fixing plate is fixedly connected to one side of the silo, and a ladder is fixedly connected to one side of the fixing plate.

[0008] By adopting the above technical solution, the fixing plate plays a role in fixing and supporting the ladder.

[0009] The present invention is further configured as follows: a Fuma wheel is fixedly connected to the lower surface of the bracket.

[0010] By adopting the above technical solution, the setting of the Fuma wheel can facilitate the movement of the device.

[0011] The present invention is further configured as follows: a feed hopper is fixedly connected to the middle of the upper surface of the silo, and the feed hopper is funnel-shaped.

[0012] By adopting the above technical solution, the funnel shape is set to facilitate material discharge.

[0013] The present invention is further configured as follows: the number of the Foma wheels is four, and the four Foma wheels are fixedly connected to the lower surface of the bracket in the form of a rectangular array.

[0014] By adopting the above technical solution, the arrangement of four Forma wheels makes the vehicle more stable during movement.

[0015] The present invention is further configured as follows: a fourth conveyor belt is fixedly connected to one side of the mixer, and a notch is opened on one side of the mixer.

[0016] By adopting the above technical solution, the fourth conveyor belt facilitates the transmission of materials.

[0017] The present invention is further configured as follows: a hinge is fixedly connected to one side of the upper surface of the feed hopper, and a top cover is fixedly connected to one side of the hinge.

[0018] By adopting the above technical solution, the provision of the top cover can prevent debris from entering the interior of the device through the feed hopper after use.

[0019] The present invention is further configured as follows: a fixing plate is fixedly connected to the upper surface of the top cover, and a handle is fixedly connected to the upper surface of the fixing plate.

[0020] By adopting the above technical solution, the setting of the handle can facilitate the staff to open and close the top cover.

[0021] The present invention is further configured as follows: a protective cover is fixedly connected to the surface of the handle, the material of the protective cover is rubber, and an anti-slip protrusion is fixedly connected to the surface of the protective cover.

[0022] By adopting the above technical solution, the provision of the handle gloves plays a role in protecting the handles, making it convenient for workers to use.

[0023] The present invention is further configured as follows: a method for preparing phosphate rock powder drying-free cold-pressed pellets, comprising the following steps:

[0024] S1: Loading: Put the prepared raw phosphate rock powder / washed phosphate rock powder / sintered phosphate rock powder into the silo by a forklift for use;

[0025] S2: Batching: the materials in the silo are transported to the batching machine through the first conveyor belt. In addition, other raw materials are added. Various raw materials are quantitatively batched by the batching machine according to a certain ratio to meet the requirements of pellet production;

[0026] S3: Adding an adhesive, and putting the prepared materials onto the second conveyor belt for conveying. During the conveying process, the drying-free adhesive for phosphate rock pellets is evenly sprayed on the second conveyor belt. The purpose of adding the drying-free adhesive for phosphate rock pellets is to improve the strength of the pellets, so that they are resistant to falling and high temperature cracking, etc., and the drying-free adhesive for phosphate rock pellets can effectively bond the phosphate rock powder together to form a compact pellet. Secondly, the phosphate rock wet pellets formed by cold pressing with the drying-free adhesive for phosphate rock pellets can be quickly solidified by drying at room temperature, so that the compressive strength of the dry ball is improved, and the thermal stability of the furnace is increased. In addition, the production process is simplified, energy consumption is reduced, and the forming of the pellets is more stable and controllable, thereby improving production efficiency.

[0027] S4: Mixing and stirring, adding the drying-free binder for phosphate rock pellets into the mixer and stirring evenly, and the stirring time is 2 minutes to ensure that the drying-free binder for phosphate rock pellets and the material can be mixed evenly;

[0028] S5: Add water and stir. After the material and the drying-free binder for phosphate rock pellets are mixed, in order to ensure that the drying-free binder for phosphate rock pellets and the material can produce a chemical reaction, an appropriate amount of water needs to be added to the mixer during the stirring process to ensure that a chemical reaction occurs between the material and the binder, so that the produced pellets are better.

[0029] S6: preparation, after adding water and stirring, pressing the mixture into balls by a ball press to finally obtain wet phosphate rock powder without drying and cold pressing balls;

[0030] S7: Dry the finished product. The wet phosphate rock powder drying-free cold-pressed pellets need to be dried for 2-3 days to finally obtain dry phosphate rock powder drying-free cold-pressed pellets, and the moisture content of the pellets is controlled below 1%.

[0031] The invention has the beneficial effects that wet phosphate rock pellets formed by cold pressing with a drying-free adhesive after adding phosphate rock pellets can be quickly solidified by airing at room temperature, so that the compressive strength of the dry balls is improved, the thermal stability of the furnace is increased, the production process is simplified, the energy consumption is reduced, the forming of the pellets is more stable and controllable, and the production efficiency is improved. In addition, the pellet forming rate is high, the wet pellets are aired for 2-3 days, and the compressive strength reaches more than 100kg in 48 hours, the compressive strength is greater than 80kg at 0-500℃, and the compressive strength is greater than 30kg at 0-900℃, which can meet the requirements of customers, without adding drying equipment, reducing equipment investment and production cost, and can replace phosphate rock for electric furnace (submersible furnace) production of yellow phosphorus, the pellets have uniform particle size, certain compressive strength and wear resistance, good heat resistance, and moisture content is less than 1%, which can reduce furnace power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 It is a structural schematic diagram of the present invention;

[0034] Figure 2 It is a schematic structural diagram of the first conveyor belt of the present invention;

[0035] Figure 3 It is a structural schematic diagram of the feed hopper of the present invention;

[0036] Figure 4 For the present invention Figure 1 The enlarged structural diagram at B in the middle;

[0037] Figure 5 For the present invention Figure 1 The enlarged structural diagram at A in the middle;

[0038] Figure 6 It is a structural schematic diagram of the ladder of the present invention.

[0039] In the figure, 1, silo; 2, first conveyor belt; 3, second conveyor belt; 4, elevator; 5, mixer; 6, third conveyor belt; 7, ball press; 8, bracket; 9, discharge pipe; 10, baffle; 11, support table; 12, second motor; 13, first transmission wheel; 14, conveyor belt; 15, second transmission wheel; 16, fixed plate; 17, ladder; 18, Foma wheel; 19, feed hopper. DETAILED DESCRIPTION

[0040] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Reference Figure 1-6 A method for preparing phosphate rock powder drying-free cold-pressed pellets, comprising a silo 1, a first conveyor belt 2, a second conveyor belt 3, an elevator 4, a mixer 5, a third conveyor belt 6 and a pellet press 7. A feed hopper 19 is fixedly connected to the middle of the upper surface of the silo 1, and the feed hopper 19 is funnel-shaped. A hinge is fixedly connected to one side of the upper surface of the feed hopper 19, and a top cover is fixedly connected to one side of the hinge. A fixing plate is fixedly connected to the upper surface of the top cover, and a handle is fixedly connected to the upper surface of the fixing plate. A protective cover is fixedly connected to the surface of the handle, and the material of the protective cover is rubber. The surface of the protective cover is fixedly connected to an anti-slip protrusion. A fixing plate 16 is fixedly connected to one side of the silo 1, and a ladder 17 is fixedly connected to one side of the fixing plate 16. The lower surface of the bracket 8 is fixedly connected to A Foma wheel 18 is connected, the number of the Foma wheels 18 is four, and the four Foma wheels 18 are fixedly connected to the lower surface of the bracket 8 in the form of a rectangular array, a motor is fixedly connected to one side of the silo 1, a fourth conveyor belt 19 is fixedly connected to one side of the mixer 5, a notch is opened on one side of the mixer 5, the lower surface of the mixer 5 is fixedly connected to the bracket 8, a discharge pipe 9 is fixedly connected to one side of the lower surface of the silo 1, a baffle 10 is provided at one end of the discharge pipe 9, a support platform 11 is fixedly connected to the lower surface of the third conveyor belt 6, a second motor 12 is fixedly connected to the inside of the support platform 11, a first transmission wheel 13 is fixedly connected to the output end of the second motor 12, and the first transmission wheel 13 is transmission-connected to the second transmission wheel 15 through a conveyor belt 14;

[0042] A method for preparing drying-free cold-pressed pellets of phosphate rock powder, comprising the following steps:

[0043] S1: Loading, putting the prepared raw phosphate rock powder / washed phosphate rock powder / sintered phosphate rock powder into the silo 1 by a forklift for use;

[0044] S2: Batching: the material in the silo 1 is transported to the batching machine through the first conveyor belt 2, and other raw materials are added. Various raw materials are quantitatively batched according to a certain ratio through the batching machine to meet the requirements of pellet production;

[0045] S3: Adding an adhesive, and putting the prepared materials onto the second conveyor belt 3 for conveying. During the conveying process, the drying-free adhesive for phosphate rock pellets is evenly sprayed on the second conveyor belt 3. The purpose of adding the drying-free adhesive for phosphate rock pellets is to improve the strength of the pellets, so that they are resistant to falling and high temperature cracking, etc., and the drying-free adhesive for phosphate rock pellets can effectively bond the phosphate rock powder together to form a compact pellet. Secondly, the phosphate rock wet pellets formed by cold pressing with the drying-free adhesive for phosphate rock pellets can be quickly solidified by drying at room temperature, so that the compressive strength of the dry ball is improved, and the thermal stability of the furnace is increased. In addition, the production process is simplified, the energy consumption is reduced, and the forming of the pellets is more stable and controllable, thereby improving the production efficiency.

[0046] S4: Mixing and stirring, adding the drying-free binder for phosphate rock pellets to the mixer 5 and stirring evenly, the stirring time is 2 minutes to ensure that the drying-free binder for phosphate rock pellets and the material can be evenly mixed;

[0047] S5: adding water and stirring. After the material and the drying-free binder for phosphate rock pellets are mixed, in order to ensure that the drying-free binder for phosphate rock pellets and the material can produce a chemical reaction, an appropriate amount of water needs to be added to the mixer 5 during the stirring process to ensure that a chemical reaction occurs between the material and the binder, so that the produced pellets are better.

[0048] S6: preparation, after adding water and stirring, pressing the phosphate rock powder into balls by a ball press 7, and finally obtaining wet phosphate rock powder without drying and cold pressing balls;

[0049] S7: Dry the finished product. The wet phosphate rock powder drying-free cold-pressed pellets need to be dried for 2-3 days to finally obtain dry phosphate rock powder drying-free cold-pressed pellets, and the moisture content of the pellets is controlled below 1%.

[0050] Specifically, the content of P205 in the raw material in step S1 is 25%-30%, the amount of drying-free binder added for phosphate rock pellets in step S3 is 3%-4% of the phosphate rock, and the amount of water sprayed in step S5 is 8%-10% of the phosphate rock.

[0051] The invention has a high pellet forming rate. After the wet pellets are air-dried for 2 to 3 days, the compressive strength reaches more than 100 kg in 48 hours. The compressive strength at 0 to 500° C. is greater than 80 kg, and the compressive strength at 0 to 900° C. is greater than 30 kg. The invention can meet the requirements of customers without adding drying equipment, thus reducing equipment investment and production costs. The invention can replace phosphate rock and be used in electric furnaces (ore-heating furnaces) to produce yellow phosphorus. The pellets have uniform particle size, certain compressive strength and wear resistance, good heat resistance, and moisture content of less than 1%, thereby reducing furnace power consumption.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing phosphate rock powder without drying and cold pressing pellets, characterized in that: The following steps are involved: S1: Loading, the prepared raw phosphate rock powder / washed phosphate rock powder / sintered phosphate rock powder is put into the silo (1) by a forklift for use; S2: batching, the material in the silo (1) is transported to the batching machine through the first conveyor belt (2), and other raw materials are added. The various raw materials are quantitatively batched according to a certain ratio by the batching machine to meet the requirements of pellet production; S3: Adding an adhesive, and putting the prepared materials onto the second conveyor belt (3) for conveying. During the conveying process, the drying-free adhesive for phosphate rock pellets is evenly sprayed on the second conveyor belt (3). The purpose of adding the drying-free adhesive for phosphate rock pellets is to improve the strength of the pellets, so that they are resistant to falling and do not burst at high temperatures. In addition, the drying-free adhesive for phosphate rock pellets can effectively bond the phosphate rock powder together to form pellets with a tight structure. Secondly, the phosphate rock wet pellets formed by cold pressing with the drying-free adhesive for phosphate rock pellets can be quickly solidified by drying at room temperature, so that the compressive strength of the dry balls is improved and the thermal stability of the furnace is increased. In addition, the production process is simplified, energy consumption is reduced, and the forming of the pellets is more stable and controllable, thereby improving production efficiency. S4: Mixing and stirring, adding the drying-free binder for phosphate rock pellets into the mixer (5) and stirring evenly, the stirring time is 2 minutes to ensure that the drying-free binder for phosphate rock pellets and the material can be mixed evenly; S5: adding water and stirring. After the material and the drying-free binder for phosphate rock pellets are mixed, in order to ensure that the drying-free binder for phosphate rock pellets and the material can produce a chemical reaction, an appropriate amount of water needs to be added to the mixer (5) during the stirring process to ensure that a chemical reaction occurs between the material and the binder, so that the produced pellets are of better quality; S6: preparation, after adding water and stirring, pressing the mixture into balls by a ball press (7), and finally obtaining wet phosphate rock powder without drying and cold pressing balls; S7: Dry the finished product. The wet phosphate rock powder drying-free cold-pressed pellets need to be dried in the sun for 2-3 days to finally obtain dry phosphate rock powder drying-free cold-pressed pellets, and the moisture content of the pellets is controlled below 1%.

2. The method for preparing drying-free cold-pressed pellets of phosphate rock according to claim 1, characterized in that: The content of P205 in the raw material in step S1 is 25%-30%.

3. The method for preparing drying-free cold-pressed pellets of phosphate rock according to claim 1, characterized in that: In step S3, the amount of the drying-free binder used for the phosphate rock pellets is 3%-4% of the phosphate rock.

4. The method for preparing drying-free cold-pressed pellets of phosphate rock according to claim 1, characterized in that: The amount of water sprayed in step S5 is 8%-10% of the phosphate rock powder.

5. The method for preparing drying-free cold-pressed pellets of phosphate rock according to any one of claims 1 to 4, characterized in that: The invention comprises a silo (1), a first conveyor belt (2), a second conveyor belt (3), an elevator (4), a mixer (5), a third conveyor belt (6) and a ball press (7), and is characterized in that: a motor is fixedly connected to one side of the silo (1), a bracket (8) is fixedly connected to the lower surface of the mixer (5), a discharge pipe (9) is fixedly connected to one side of the lower surface of the silo (1), a baffle (10) is provided at one end of the discharge pipe (9), a support platform (11) is fixedly connected to the lower surface of the third conveyor belt (6), a second motor (12) is fixedly connected to the inside of the support platform (11), a first transmission wheel (13) is fixedly connected to the output end of the second motor (12), the first transmission wheel (13) is transmission-connected to the second transmission wheel (15) through a conveyor belt (14), a fixed plate (16) is fixedly connected to one side of the silo (1), and the fixed plate A ladder (17) is fixedly connected to one side of the (16), a Foma wheel (18) is fixedly connected to the lower surface of the bracket (8), a feed hopper (19) is fixedly connected to the middle of the upper surface of the silo (1), the feed hopper (19) is funnel-shaped, the number of the Foma wheels (18) is four, and the four Foma wheels (18) are fixedly connected to the lower surface of the bracket (8) in the form of a rectangular array, a fourth conveyor belt (19) is fixedly connected to one side of the mixer (5), a notch is opened on one side of the mixer (5), a hinge is fixedly connected to one side of the upper surface of the feed hopper (19), a top cover is fixedly connected to one side of the hinge, a fixing plate is fixedly connected to the upper surface of the top cover, a handle is fixedly connected to the surface of the handle, a protective cover is fixedly connected to the surface of the handle, the material of the protective cover is rubber, and the surface of the protective cover is fixedly connected to anti-slip protrusions.

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