Activating, modifying and atomizing device for heavy calcium carbonate

Abstract

The utility model discloses a ground calcium carbonate activation modification atomization device which comprises an atomization mixing device body, the atomization mixing device body comprises a feeding cavity, a mixing cavity and a discharging pipe, a rotatable atomization head is arranged at the outer end of the feeding cavity, the front portion of the atomization head is communicated with a powder feeding pipe, and the discharging pipe is provided with a negative pressure micrometering valve. A pressure sensor at the joint of the mixing cavity and the discharging pipe and a flow regulating valve on the powder feeding pipe form closed-loop control, the rotatable atomizing head comprises a modifier spraying pipe and a high-pressure air pipe which are coaxial, the modifier spraying pipe is connected with a metering tank and a preheating tank with an electric heating wire, and the mixing cavity is provided with a sectional type electric heating ring and an observation window. The device disclosed by the utility model can improve the mixing effect of a modifier and powder, improves the activation and modification quality, and is high in practicability.

Description

Technical Field

[0001] This utility model belongs to the technical field of calcium carbonate processing equipment, specifically relating to a heavy calcium carbonate activation and modification atomization device. Background Technology

[0002] Heavy calcium carbonate, as an important inorganic filler, occupies an indispensable position in many industries such as plastics, rubber, coatings, and papermaking due to its wide availability, low cost, and excellent chemical stability. Its application in polymer composites can not only reduce product costs but also improve the rigidity, wear resistance, and dimensional stability of the materials. However, the surface of heavy calcium carbonate particles has strong hydrophilicity and poor compatibility with organic polymers. Direct filling can lead to a decrease in the mechanical properties of composite materials; therefore, surface activation modification treatment is necessary to improve its surface characteristics.

[0003] The core of surface activation modification lies in uniformly coating the surface of calcium carbonate particles with modifiers (such as stearic acid, titanate coupling agents, etc.) through an atomization device to form a monolayer coating film, thereby achieving good bonding with polymer materials. This process places stringent requirements on the performance of the atomization device, including the uniformity of modifier atomization, the mixing efficiency of powder and modifier, and the stability of process parameters.

[0004] Existing activated and modified atomizing devices have many technical defects:

[0005] Firstly, there is insufficient mixing uniformity. Traditional atomizing heads are mostly designed with a fixed angle, which cannot adjust the atomizing angle according to the particle size distribution of calcium carbonate powder, resulting in large fluctuations in the coating rate of the modifier on the powder surface. For narrow particle size distribution calcium carbonate commonly used in fields such as breathable membranes and high-end coatings, atomizing heads with a fixed angle are prone to local over- or under-coating, directly affecting key indicators such as product activation rate and oil absorption value.

[0006] Secondly, the precision of process parameter control is low. A negative pressure environment is crucial for ensuring smooth powder flow and thorough mixing, but existing equipment often relies on manual valves for negative pressure adjustment, resulting in significant pressure fluctuations. This can easily cause powder backflow or accumulation in the mixing chamber, leading to production interruptions or unstable product quality. Simultaneously, the heating systems are mostly integral structures with slow heating response and uneven temperature distribution. This can cause modifiers to solidify prematurely or lose activity due to temperature fluctuations, further affecting the coating effect.

[0007] Third, the equipment suffers from poor wear resistance and maintainability. Heavy calcium carbonate powder has high hardness, and during high-speed flow, it continuously erodes components such as the feed chamber and pipes. The ordinary metal inner walls of traditional equipment are easily worn, resulting in a short service life. This not only increases maintenance costs but also can cause metal debris from wear to contaminate the product. Furthermore, some core components of the equipment are designed to be non-removable, making cleaning and maintenance extremely inconvenient and impacting production efficiency.

[0008] Fourth, insufficient process monitoring capabilities. The mixing state of materials in the mixing chamber is an important basis for judging the modification effect, but existing equipment generally lacks effective observation methods and cannot grasp the mixing situation in real time, resulting in a lag in process adjustment and making it difficult to ensure the consistency of product quality.

[0009] These issues collectively lead to significant fluctuations in the performance indicators of modified heavy calcium carbonate, such as high oil absorption value, marked decrease in whiteness, and insufficient activation rate, making it difficult to meet the quality requirements of high-end applications. Therefore, developing an activation modification atomization device that can achieve uniform atomization of the modifier, precise control of process parameters, and is wear-resistant and easy to maintain is of great significance for improving the quality of heavy calcium carbonate products and expanding their application areas. Utility Model Content

[0010] To overcome the shortcomings of existing activation and modification atomization devices, such as poor mixing uniformity, unstable process parameters, insufficient wear resistance, and inconvenient observation and maintenance, this utility model provides a heavy calcium carbonate activation and modification atomization device with optimized structure and reliable performance. This device improves the mixing efficiency and coating uniformity of the modifier and powder, ensures the stability of product quality, and extends the service life of the equipment.

[0011] To achieve the above technical objectives, the present invention adopts the following technical solution:

[0012] A heavy calcium carbonate activation and modification atomization device includes an atomizing mixing device body, which comprises a feed chamber, a mixing chamber, and a discharge pipe. A rotatable atomizing head is provided at the outer end of the feed chamber, and the rotatable atomizing head is connected to the powder feed pipe. The discharge pipe is centrally connected to the end of the mixing chamber. A negative pressure fine-tuning valve is provided on the discharge pipe, and a pressure sensor is installed at the connection flange between the mixing chamber and the discharge pipe. The pressure sensor is electrically connected to the flow regulating valve on the powder feed pipe to form a closed-loop control.

[0013] Furthermore, the rotatable atomizing head includes a modifier nozzle and a high-pressure air pipe arranged coaxially.

[0014] Furthermore, the input end of the modifier nozzle is sealed and connected to the metering tank.

[0015] Furthermore, the bottom of the metering tank is integrally connected to a preheating tank, and the preheating tank has a built-in electric heating wire.

[0016] Furthermore, a guide plate made of polytetrafluoroethylene is provided on the inner wall of the connection between the powder feed pipe and the feed chamber.

[0017] Furthermore, the inner wall of the mixing chamber is circumferentially distributed with segmented electric heating rings, each segmented electric heating ring consisting of three aluminum alloy arc-shaped heating elements, each segmented heating element being spliced ​​together by stainless steel clips and containing a heating wire and a temperature sensing resistor.

[0018] Furthermore, an observation window is provided on the side wall of the mixing chamber. The observation window is made of quartz glass and its edges are sealed with a silicone sealing ring.

[0019] Furthermore, the inner wall of the feeding chamber is coated with an alumina wear-resistant coating.

[0020] Furthermore, the end of the discharge pipe is connected to a detachable stainless steel filter screen.

[0021] Furthermore, the outer wall of the mixing chamber is welded with carbon steel reinforcing ribs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the device of this utility model.

[0023] In the attached diagram: 1: Atomizing mixing device body; 2: Feed chamber; 3: Mixing chamber; 4: Discharge pipe; 5: Rotatable atomizing head; 6: Powder feed pipe; 7: Metering tank; 8: Preheating tank; 9: Guide plate; 10: Segmented electric heating ring; 11: Observation window; 12: Stainless steel filter screen; 41: Negative pressure fine adjustment valve; 51: Modifier spray pipe; 52: High-pressure air pipe; 61: Flow regulating valve. Detailed Implementation

[0024] The foregoing has broadly described the features and technical advantages of this utility model in order to provide a better understanding of its detailed description. Other features and advantages of this utility model will be described below. Those skilled in the art will understand that the disclosed concepts and specific embodiments can be readily used as a basis for modifying or designing other structures to accomplish the same purpose of this utility model. Those skilled in the art will also recognize that such equivalent constructions do not depart from the spirit and scope of this utility model. The novel features considered characteristic of this utility model, its structure and method of operation, as well as further objects and advantages, will be better understood from the following description in conjunction with the accompanying drawings. However, it should be clearly understood that each feature provided is for description and illustration only and is not intended to limit the definition of this utility model.

[0025] The present utility model patent will be further described in detail below with reference to the accompanying drawings and examples:

[0026] The atomizing mixing device body 1 serves as the core frame, with the feed chamber 2, mixing chamber 3, and discharge pipe 4 sequentially and sealed along the material flow direction inside. A rotatable atomizing head 5 is detachably installed at the outer end of the feed chamber 2 via a flange. The rotatable atomizing head 5 connects to the powder feed pipe 6, forming an initial contact channel between the powder and the modifier. The rotatable atomizing head 5 adopts a coaxial nested structure, with a modifier spray pipe 51 on the inner side and a high-pressure air pipe 52 on the outer side. The input end of the modifier spray pipe 51 is connected to the outlet of the metering tank 7 via a sealed joint. The bottom of the metering tank 7 is integrally welded to the preheating tank 8. An electric heating wire is fixedly installed inside the preheating tank 8 to ensure the modifier maintains a suitable viscosity through heating. A polytetrafluoroethylene (PTFE) guide plate 9 is fixed to the inner wall of the connection port between the powder feed pipe 6 and the feed chamber 2 using a high-temperature resistant adhesive. The guide plate 9 guides the powder flow towards the mixing chamber 3. A segmented electric heating ring 10 is distributed circumferentially on the inner wall of the mixing chamber 3. The heating ring is composed of three sections of aluminum alloy arc-shaped heating elements spliced ​​together with stainless steel clips. Each section of heating element is embedded with an electric heating wire and a temperature sensing resistor to achieve uniform heating and temperature monitoring. The side wall of the mixing chamber 3 has a circular mounting hole, in which a quartz glass observation window 11 is embedded. The observation window 11 is sealed to the chamber wall with a silicone sealing ring to prevent air leakage. The inner wall of the feeding chamber 2 is covered with an alumina wear-resistant coating through thermal spraying to enhance its erosion resistance. The discharge pipe 4 is welded to the end of the mixing chamber 3 in the middle. A negative pressure fine-tuning valve 41 is installed on the discharge pipe 4, and a pressure sensor is fixed at the connection flange of the discharge pipe 4 and the mixing chamber 3. The pressure sensor is electrically connected to the flow regulating valve 61 on the powder feeding pipe 6 through a wire to form a closed-loop control circuit. The end of the discharge pipe 4 is connected to a detachable stainless steel filter screen 12 through a thread. The outer wall of the mixing chamber 3 is uniformly welded with carbon steel reinforcing ribs along the axial direction to improve the overall structural strength.

[0027] The technical principle of this utility model is as follows:

[0028] The atomizing mixing device body 1 includes a feed chamber 2, a mixing chamber 3, and a discharge pipe 4, which are sequentially sealed and connected to form a continuous reaction channel. The modifier spray nozzle 51 of the rotatable atomizing head 5 is coaxially arranged with the high-pressure air pipe 52. Compressed air is introduced into the high-pressure air pipe 52 to atomize the modifier into micron-sized droplets. The rotatable structure can adapt to the coating requirements of powders with different particle sizes. The metering tank 7 precisely controls the amount of modifier delivered, and the electric heating wire of the preheating tank 8 ensures that the modifier maintains a low viscosity state, thereby improving the uniformity of atomization.

[0029] The heavy calcium carbonate conveyed by the powder feed pipe 6 is guided by the polytetrafluoroethylene guide plate 9 and initially mixed with the atomized modifier in the feed chamber 2; the segmented electric heating ring 10 on the inner wall of the mixing chamber 3 provides a stable temperature field through the heating wire of the aluminum alloy arc heating plate, and the temperature sensing resistor is adjusted in real time to ensure the efficiency of the modification reaction; the observation window 11 can directly monitor the mixing state to ensure uniform coating.

[0030] The negative pressure fine-tuning valve 41 of the discharge pipe 4 forms a closed-loop control with the pressure sensor and the flow regulating valve 61. The pressure sensor detects the pressure at the end of the mixing chamber 3 and feeds it back to the flow regulating valve 61 in real time to dynamically adjust the powder feed rate, maintain stable negative pressure in the chamber, and avoid powder accumulation or backflow. The alumina wear-resistant coating of the feed chamber 2 resists powder erosion, the carbon steel reinforcing ribs of the mixing chamber 3 enhance structural stability, and the stainless steel filter screen 12 of the discharge pipe 4 intercepts insufficiently modified particles, ultimately achieving efficient coating of the modifier and uniform product quality.

[0031] Those skilled in the art will recognize that the examples described herein are intended to help the reader understand the principles of this invention, and should be understood as not limiting the scope of protection of this invention to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations based on these technical teachings disclosed herein without departing from the scope of this invention, and these modifications and combinations are still within the scope of protection of this invention.

Claims

1. A heavy calcium carbonate activated and modified atomizing device, characterized in that, The device includes an atomizing mixing device body (1), which includes a feeding chamber (2), a mixing chamber (3) and a discharge pipe (4). The feeding chamber (2) has a rotatable atomizing head (5) at its outer end, which is connected to a powder feeding pipe (6). The discharge pipe (4) is centrally connected to the end of the mixing chamber. A negative pressure fine-tuning valve (41) is provided on the discharge pipe (4). A pressure sensor is installed at the connecting flange of the mixing chamber (3) and the discharge pipe (4). The pressure sensor is electrically connected to the flow regulating valve (61) on the powder feeding pipe to form a closed-loop control.

2. The heavy calcium carbonate activated and modified atomizing device according to claim 1, characterized in that, The rotatable atomizing head (5) includes a modifier nozzle (51) and a high-pressure air pipe (52) arranged coaxially.

3. The heavy calcium carbonate activated and modified atomizing device according to claim 2, characterized in that, The input end of the modifier nozzle (51) is sealed and connected to the metering tank (7).

4. The heavy calcium carbonate activated and modified atomizing device according to claim 3, characterized in that, The bottom of the metering tank (7) is integrally connected to the preheating tank (8), and the preheating tank (8) has a built-in electric heating wire.

5. The heavy calcium carbonate activated and modified atomizing device according to claim 1, characterized in that, The inner wall of the connection between the powder feed pipe (6) and the feed chamber (2) is provided with a guide plate (9) made of polytetrafluoroethylene.

6. The heavy calcium carbonate activated and modified atomizing device according to claim 1, characterized in that, The inner wall of the mixing chamber (3) is circumferentially distributed with segmented electric heating rings (10). The segmented electric heating rings (10) are composed of three aluminum alloy arc-shaped heating plates. Each heating plate is spliced ​​together by stainless steel buckles and has a built-in heating wire and temperature sensing resistor.

7. The heavy calcium carbonate activated and modified atomizing device according to claim 1, characterized in that, An observation window (11) is provided on the side wall of the mixing chamber (3). The observation window (11) is made of quartz glass and its edges are sealed with silicone sealing rings.

8. The heavy calcium carbonate activated and modified atomizing device according to claim 1, characterized in that, The inner wall of the feed chamber (2) is coated with an alumina wear-resistant coating.

9. The heavy calcium carbonate activated and modified atomizing device according to claim 1, characterized in that, The end of the discharge pipe (4) is connected to a detachable stainless steel filter screen (12).

10. The heavy calcium carbonate activated and modified atomizing device according to claim 1, characterized in that, The outer wall of the mixing chamber (3) is welded with carbon steel reinforcing ribs.

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