Device and method for modifying calcium carbonate powder with high coating rate

Abstract

The invention discloses a device and method for modifying a calcium carbonate powder with a high coating rate. The device comprises a machine body, a rotating mechanism is connected to the bottom of the machine body, a discharging pipe is arranged on one side of the bottom of the machine body, a cover plate is connected to the top of the machine body, and a spraying mechanism for spraying a modifier is fixedly arranged on the surface of the cover plate. The bottom end of the spraying mechanism is located in the machine body and provided with a shielding mechanism, the shielding mechanism is matched with the bottom end of the spraying mechanism and connected with the cover plate, and an air blowing assembly for blowing materials is arranged between the spraying mechanism and the cover plate. The shielding mechanism is arranged and can guide a passivating agent when the spraying mechanism sprays, meanwhile, the contact space between the spraying mechanism and dust is reduced, and therefore the situation that the spraying mechanism is blocked by dust attached to the spraying mechanism is reduced, and when the spraying mechanism stops spraying, the shielding mechanism can rotate to shield the discharging position of the spraying mechanism, material blockage caused by adhesion of a large amount of dust during mixing is avoided, and normal spraying operation of the spraying mechanism is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of calcium carbonate powder modification, and in particular relates to a high-coverage calcium carbonate powder modification device and a method thereof. Background technique [0002] Calcium carbonate is an inorganic material with many hydroxyl groups on its surface, which is easy to absorb water. Without surface treatment, the surface of calcium carbonate powder is hydrophilic and oleophobic, and has strong polarity. It is difficult to disperse uniformly in organic media, and it is difficult to form a good bond between the two interfaces. . Nano-calcium carbonate has small particle size, large specific surface area and high specific surface energy. During the preparation and post-treatment process, it is very easy for particles to coagulate and agglomerate to form secondary particles. The properties possessed by it will affect the actual application effect, and it will not play the role of reinforcement. ...

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Problems solved by technology

[0003] Calcium carbonate modifier is usually used to modify calcium carbonate powder, and the calcium carbonate modifier is wrapped on the surface of calcium carbonate powder by a high-speed mixer to achieve the purpose of modification. In actual operation, the modifier needs to be sprayed into the mixture The contact area with the calcium carbonate powder is increased in the machine. Since the spraying of the modifier is performed at intervals, the mixing operation continues when the spraying of the modifier is suspended, and the materials inside the mixer will splash into the nozzle spraying the modifier. surface, causing the discharge hole of the nozzle to be blocked, resulting in the inability of the nozzle to continue spraying, and the nozzle needs to be cleaned regularly, otherwise the modifier cannot enter the mixer and affect the modification operation.

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