Nano calcium carbonate pressurized carbonation and surface modification integrated reaction kettle and application thereof

Abstract

The invention discloses a nano calcium carbonate pressurization carbonation and surface modification integrated reaction kettle and an application thereof, wherein the nano calcium carbonate pressurization carbonation and surface modification integrated reaction kettle comprises a main reaction kettle and a modification reaction kettle, and the main reaction kettle comprises a main reaction kettlemotor, a stirring shaft, a main reaction kettle stirrer, a slurry inlet pipeline, a slurry discharge pipeline and a CO2 and modifier conveying pipeline; the stirring shaft is arranged in the main reaction kettle, a main reaction kettle motor is arranged above the stirring shaft, the main reaction kettle motor is arranged at the top of the reaction kettle, and the main reaction kettle stirrer is arranged on the stirring shaft; the slurry inlet pipeline is arranged at the middle upper part of the main reaction kettle, the slurry discharge pipeline is arranged at the bottom of the main reactionkettle, and the CO2 and modifier conveying pipeline extends to the lower part of the stirrer from the main reaction kettle. According to the invention, the carbonation reaction and surface modification of nano calcium carbonate are carried out in one reaction kettle, and slurry does not need to be pumped to other reaction kettles, so that unreacted calcium hydroxide turbid liquid is effectively controlled to enter a surface modification system, the product quality is improved, the process is simplified, the production efficiency of calcium carbonate is improved, and the equipment cost is reduced.

Description

technical field [0001] The invention relates to the technical field of nano-calcium carbonate production, in particular to a reaction kettle integrating pressurized carbonation and surface modification of nano-calcium carbonate. Background technique [0002] Calcium Carbonate (CaCO 3 ) is one of the most abundant inorganic minerals on the earth. As an important inorganic filler, calcium carbonate is widely used in rubber, Industrial fields such as plastics, paper making, coatings, ceramics, cosmetics, toothpaste, food, medicine and bionic materials. With the progress of miniaturization and surface treatment of calcium carbonate, people's demand for miniaturized calcium carbonate is also increasing. Due to its small particle size, high specific surface area and special surface treatment, nano-calcium carbonate has superior properties that cannot be compared with ordinary calcium carbonate. Nano-calcium carbonate is widely used in the fields of plastics, rubber, viscose, co...

AI Technical Summary

Problems solved by technology

In China, due to the differences in the type of reactor, stirring form, stirring intensity and process principle used by the two, the two reaction processes are carried out separately, and multiple sets of carbonation reactors are used in parallel with surface treatment reactors, and the slurry often occurs during the conveying process. In the process, calcium hydroxide suspension is mixed into the nano-calcium carbonate cooked pulp, resulting in unstable product quality

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