Yuan Lei small classroom, 6 categories of powder surface modification equipment and selection principles.

Release time:

2024-01-29 09:35


Yuan Lei small classroom, 6 categories of powder surface modification equipment and selection principles.


Process and equipment is one of the key factors to improve the surface performance of powder according to the application needs, and there are many types of powder surface modification equipment, including dry modification equipment and wet modification equipment.Understanding the structure, principle and scope of application of the equipment is the basis for the correct selection of surface modification equipment..



1. Common surface modification equipment


(1) Continuous powder surface modification machine


SLG type continuous powder surface modification machine is mainly composed of thermometer, discharge port, air inlet, air duct, main engine, feed port, metering pump and feeder. The system configuration generally includes feeding device, modifier metering device, host, cyclone collector, bag dust collector, etc.


Scope of application:It is suitable for continuous large-scale production of inorganic powders with organic chemical coating on various surfaces, such as heavy calcium carbonate, light calcium carbonate, kaolin, zinc oxide, magnesium hydroxide, strong alumina, sericite, barium sulfate, white carbon black, titanium dioxide, talc and other inorganic active fillers or pigments. It can be matched with dry powder preparation process (such as ultrafine grinding process), and can also be set up separately for the surface modification of various ultrafine powders and the deagglomeration and surface modification of nano powders.


(2) High-speed heating mixer


It is mainly composed of rotary cover, mixing pot, baffle plate, stirring device, discharging device, driving motor, machine base, etc.


Scope of application:It is an intermittent batch powder surface modification equipment, the processing time can be long or short, suitable for medium and small batch powder surface chemical coating modification and laboratory modification agent formula test research.


(3) High-speed airflow impact surface modification machine


The main engine structure is mainly composed of high-speed rotating rotor, stator, circulation loop, vane, jacket, feeding and discharging device. The whole system consists of a mixer, a metering and feeding device, a high-speed airflow impact surface modification machine, a product collection device, and a control device.


Scope of application:The system can not only be used for surface chemical coating, encapsulation, mechanochemical modification and particle spheroidization, but also for the compounding of "micron/micron" and "nano/micron" powders. Materials can be inorganic, organic, metal, etc., a wide range of applications, but also a short time dry treatment.


(4) Horizontal Blade Mixer


Horizontal paddle mixer is a kind of intermittent powder surface modification machine with horizontal cylinder and single-axis multi-paddle as the structural characteristics. It is mainly composed of transmission mechanism, main shaft, cylinder and end cover.


Scope of application:This surface modification machine is designed for the surface modification of light and heavy calcium carbonate. It is divided into A and B models, in which A type heating medium is heat transfer oil and B type heating medium is water vapor.


(5) Turbine (rotary) grinding


It is mainly composed of machine base, driving part, crushing cavity, gap adjustment and inlet and outlet. The characteristic is that the heat generated by the ultra-fine grinding process (50 ℃ ~ 60 ℃) is used to introduce the crushed ultra-fine powder into the vortex mill, and at the same time, the pre-heated and melted stearic acid modifier is metered for continuous surface modification treatment.


Scope of application:With heating and drug delivery equipment, HWV turbine mill can form a powder surface modification system. At present, this system is mainly used for surface modification with ultrafine heavy calcium carbonate production line, and rarely used for surface modification of powder alone.


(6) Wet surface modification equipment


At present, the wet surface modification equipment mainly uses a temperature-controlled stirred reactor or reaction tank. The barrel of this equipment is generally made of two layers inside and outside with a jacket, and the jacket is filled with heating media, such as steam, heat transfer oil, etc. Some simpler surface modification tanks can also be electrically heated.


The reaction kettle or reaction tank for powder surface chemical coating modification and precipitation coating modification generally has no requirement on pressure, as long as the temperature and slurry dispersion and acid or alkali corrosion resistance are met, so the structure is relatively simple.


2, the selection principle of surface modification equipment.


(1) Good dispersion of powder and surface modifier. Only with good dispersion can the powder and surface modifier have a more equal opportunity and effect, and can also reduce the amount of surface modifier.


(2) The modification temperature and residence time can be adjusted within a certain range.


(3) Low energy consumption per unit product and low abrasion. In addition to the modifier, the main cost of surface modification is energy consumption, low energy consumption of modified equipment can reduce production costs and improve product competitiveness.


(4) less dust pollution. The dust in the modification process not only pollutes the production environment, but also loses materials, resulting in higher production costs. Therefore, it is necessary to examine the dust pollution of the equipment.


(5) Continuous production, easy operation and low labor intensity.


(6) Stable and reliable operation.


(7) High level of automatic control, which can automatically adjust the treatment amount, modifier addition amount, modification temperature and residence time according to the nature of the material and the nature of the surface modifier.


(8) The production capacity of the equipment shall be adapted to the design and production scale. When the design and production scale is increased, large-scale equipment should be selected as much as possible to reduce the number of equipment, so as to reduce the floor space, production cost and facilitate management.

Principle, modification, surface, equipment, modifier, device, scope of application, composition, heating,

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