A modified device for producing micro-nano-sized ground calcium carbonate

Abstract

A kind of modified device of producing micro-nano water mill calcium carbonate, slurry barrel (1), first diaphragm pump (2), reaction kettle (3), second diaphragm pump (4), flash dryer (5), natural gas furnace (6), classifier (7), pulse cloth bag collector (8), induced draft fan (9), spiral reamer (10), packaging machine (11), motor (12), speed reducer (13), stirring shaft (14), paddle (15), stirrer (16), cloth bag (17) and recycled product bin (18).The device of the utility model adopts wet modification, and the coating is high, and the activation degree is good;With flash dryer drying, the hot air generated by heat exchanger enters the bottom of dryer in tangent direction by inlet pipe, and spirally rises to exchange heat with incoming calcium carbonate slurry, and the drying effect is good;After classification by classifier, modified water mill calcium carbonate powder has good dispersibility and no agglomerated powder.

Description

Technical Field

[0001] This utility model relates to a modification device for producing micro-nano-scale water-milled calcium carbonate, belonging to the field of material modification technology. Background Technology

[0002] Calcium carbonate can be divided into heavy calcium carbonate and light calcium carbonate. Heavy calcium carbonate is produced by grinding and classifying ores such as calcite and marble, while light calcium carbonate is produced by calcining, digesting, and carbonizing limestone. Calcium carbonate is a basic raw material in my country's industry and is widely used in plastics, coatings, rubber, adhesives, inks, papermaking, and other fields. With the development of plastics, rubber, and inks, the requirements for the fineness of calcium carbonate are becoming increasingly stringent. While light calcium carbonate, through chemical synthesis, has a good initial particle size, it is prone to agglomeration and faces significant environmental pressures. Therefore, ultrafine heavy calcium carbonate has ushered in a good market development opportunity, and water-milled heavy calcium carbonate has emerged as a result.

[0003] Water-milled calcium carbonate is produced by preparing ultrafine heavy calcium carbonate into a slurry, grinding it into ultrafine particles through a wet stirring mill or sand mill, and then drying it. This process can produce micro-nano-scale calcium carbonate powder with a content of 100% and a density of 2µm. However, this ultrafine calcium carbonate has a large specific surface area and high surface energy, making it prone to agglomeration. Therefore, it requires modification and deagglomeration treatment. Summary of the Invention

[0004] The purpose of this invention is to address the problem that existing ultrafine calcium carbonate has a large specific surface area, high surface energy, and is prone to agglomeration, and to propose a modified device for producing micro-nano-scale water-milled calcium carbonate.

[0005] The technical solution of this utility model is as follows: a modification device for producing micro-nano-grade water-milled calcium carbonate, including a slurry tank, a reaction vessel, a flash dryer, a natural gas furnace, a classifier, a pulse bag collector, an induced draft fan, a spiral cutter, a packaging machine, and a recycled material silo; the device also includes a flash dryer, a natural gas furnace, and a diaphragm pump.

[0006] The discharge port at the bottom of the slurry tank is connected to the inlet on one side of the lower part of the reactor via a first diaphragm pump; the discharge port on the other side of the lower part of the reactor is connected to the inlet at the top of the flash dryer via a second diaphragm pump; the outlet on one side of the top of the flash dryer is connected to a classifier via a duct; the top outlet of the classifier is connected to a pulse bag collector via a pipe, and the discharge port at the bottom of the classifier is connected to a recycled material silo; the top of the pulse bag collector is connected to an induced draft fan via a duct, and the bottom of the pulse bag collector is equipped with a horizontally placed spiral auger conveyor, with the discharge port at the bottom of the pulse bag collector facing the input end of the spiral auger, and the output end of the spiral auger connected to a packaging machine; the bottom of the flash dryer is equipped with a heat exchanger and an agitator, the heat exchanger is connected to a natural gas furnace, the natural gas furnace provides hot air, and the agitator disperses the input hot air and the powder to be dried.

[0007] The reactor vessel is filled with heat-conducting oil in the inner wall partition; the top of the reactor vessel is equipped with a motor and a reducer, the output end of which is connected to a stirring shaft and a blade, and the motor drives the stirring shaft and blade to rotate through the reducer.

[0008] The slurry tank, reaction vessel, flash dryer, classifier, and pulse bag collector are all vertically installed.

[0009] The beneficial effects of this invention are as follows: the device employs wet modification, resulting in high coating and good activation; combined with flash drying, hot air generated by the heat exchanger enters the bottom of the dryer tangentially through the inlet pipe and spirals upward to exchange heat with the incoming calcium carbonate slurry, resulting in excellent drying effect; after classification by a classifier, the modified water-milled calcium carbonate powder has good dispersibility and no agglomeration. This modification device is suitable for producing micro-nano-grade water-milled calcium carbonate. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of the device of this utility model;

[0011] In the diagram, 1 is the slurry tank; 2 is the first diaphragm pump; 3 is the reactor; 4 is the second diaphragm pump; 5 is the flash dryer; 6 is the natural gas furnace; 7 is the classifier; 8 is the pulse bag filter collector; 9 is the induced draft fan; 10 is the spiral cutter; 11 is the packaging machine; 12 is the motor; 13 is the reducer; 14 is the stirring shaft; 15 is the impeller; 16 is the agitator; 17 is the filter bag; and 18 is the recycled material silo. Detailed Implementation

[0012] The specific embodiments of this utility model are as follows: Figure 1 As shown.

[0013] This embodiment describes a modification device for producing micro / nano-sized water-milled calcium carbonate, comprising: slurry tank 1, first diaphragm pump 2, reaction vessel 3, second diaphragm pump 4, flash dryer 5, natural gas furnace 6, classifier 7, pulse bag collector 8, induced draft fan 9, spiral cutter 10, packaging machine 11, motor 12, reducer 13, stirring shaft 14, impeller 15, agitator 16, filter bag 17, and recycled material silo 18.

[0014] In this embodiment, the micro-nano calcium carbonate slurry in the slurry tank 1 is obtained by a wet stirring mill or sand mill and is transported to the reaction vessel 3 by the first diaphragm pump 2 for modification.

[0015] In this embodiment, the reactor 3 is filled with heat-conducting oil, which can heat the slurry in the reactor and set the temperature. The top of the reactor 3 is equipped with a motor 12 and a reducer 13, and is connected to a stirring shaft 14 and a paddle 15. The motor 12 drives the stirring shaft 14 and the paddle 15 to rotate through the reducer 13. The modified calcium carbonate slurry in the reactor 3 is transported to the flash dryer 5 for drying through a second diaphragm pump 4.

[0016] In this embodiment, the flash dryer 5 is equipped with a stirrer 16 at the bottom, and is connected to a natural gas furnace 6 at the bottom via a heat exchanger, and is connected to a classifier 7 at the top via an air duct.

[0017] In this embodiment, the top of the classifier 7 is connected to the pulse bag collector 8 via an air duct, and the bottom outlet is connected to the recycling bin to recover the coarse particles screened out by the classifier 7; the pulse bag collector 8 is equipped with several dust collection bags 17 inside, the top is connected to the blower 9 via an air duct, and the bottom outlet is connected to the packaging machine 11 via a spiral cutter 10.

[0018] The process flow of this embodiment is as follows: The ground calcium carbonate slurry in the slurry tank 1 is quantitatively transported to the reaction vessel 3 by the first diaphragm pump 2. After reaching the modification temperature, a modifier is quantitatively added for modification. After the isothermal modification is completed, the modified calcium carbonate slurry is transported to the flash dryer 5 by the second diaphragm pump 4. At the same time, the hot air generated by the natural gas furnace 6 through the heat exchanger enters the bottom of the flash dryer 5 tangentially through the inlet pipe and rises spirally to exchange heat with the calcium carbonate slurry. Larger and wetter calcium carbonate materials fall to the bottom and are mechanically crushed by the agitator. The dried calcium carbonate fine particles rise with the rotating airflow and enter the classifier 7 for screening. The calcium carbonate fine particles that reach the required fineness enter the pulse bag collector 8 through the classifier 7 and are finally transported to the packaging machine 11 for packaging by the spiral cutter 10. The coarse calcium carbonate particles screened out by the classifier 7 are collected and recycled by the recycling bin 18.

Claims

1. A modification apparatus for producing micro / nano-sized water-milled calcium carbonate, comprising a slurry tank, a reaction vessel, a flash dryer, a natural gas furnace, a classifier, a pulse bag filter, an induced draft fan, a spiral cutter, a packaging machine, and a recycling silo; characterized in that, The device also includes a flash dryer, a natural gas furnace, and a diaphragm pump; the discharge port at the bottom of the slurry tank is connected to the inlet on one side of the lower part of the reactor via a first diaphragm pump; the discharge port on the other side of the lower part of the reactor is connected to the inlet at the top of the flash dryer via a second diaphragm pump; the outlet on one side of the top of the flash dryer is connected to a classifier via a duct; the top outlet of the classifier is connected to a pulse bag filter collector via a pipe, and the discharge port at the bottom of the classifier is connected to a recycled material silo; the top of the pulse bag filter collector is connected to an induced draft fan via a duct, and the bottom of the pulse bag filter collector is equipped with a horizontally placed spiral auger conveyor, with the discharge port at the bottom of the pulse bag filter collector facing the input end of the spiral auger, and the output end of the spiral auger connected to a packaging machine; the bottom of the flash dryer is equipped with a heat exchanger and a stirrer, the heat exchange gas is connected to the natural gas furnace, the natural gas furnace provides hot air, and the stirrer disperses the input hot air and the powder to be dried.

2. The modification apparatus for producing micro / nano-scale water-milled calcium carbonate according to claim 1, characterized in that, The reactor vessel is filled with heat-conducting oil in the inner wall partition; the top of the reactor vessel is equipped with a motor and a reducer, the output end of which is connected to a stirring shaft and a blade, and the motor drives the stirring shaft and blade to rotate through the reducer.

3. The modification apparatus for producing micro / nano-sized water-milled calcium carbonate according to claim 1, characterized in that, The slurry tank, reaction vessel, flash dryer, classifier, and pulse bag collector are all vertically installed.

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