A summary of the integrated study of calcium carbonate, "ultra-fine crushing and surface change"

Calcium carbonate is currently one of the largest fillers, divided into light calcium and heavy calcium. Heavy calcium is widely used as a filler in rubber, coatings, papermaking and plastics industries because of its low price. With the development of modern composite technology, calcium carbonate with various excellent properties has become an important functional enhancer and plays an increasingly important role in
composite materials
For calcium carbonate to change from a general volume filler to a functional filler, it must be deeply processed. There are two main ways to deep process calcium carbonate, namely ultra-fine crushing and surface change. Usually these two processes are done separately. In recent years, the integrated deep processing technology of calcium carbonate has attracted more and more attention. An integrated process is a surface change at the same time as ultra-fine crushing.
The concept of calcium carbonate integration process
Wang Linjiang with airflow shredder as the main equipment, heavy calcium carbonate at the same time carried out ultra-fine crushing and surface modified treatment, and revealed the process of calcium carbonate integration process: by high-speed airflow The mechanical energy acting on the mineral, partly used to crush the mineral, and the other part to change the properties of the mineral lattic and surface, to activate the mineral surface, is conducive to the adsorption and chemical bonding between the mineral surface and the modifier, so that the modifier molecules evenly clad the mineral surface. At the same time, modifier in the crushing process can play a grinding role, is conducive to ultra-fine crushing, modified treatment of mineral surface freedom can be greatly reduced, surface free energy reduction led to particle crushing fracture of the minimum stress reduced, resulting in easy crushing, the effect is improved.
factors affecting the effect of calcium carbonate integration process
After analyzing the process process, Wang Linjiang discusses several factors that affect the effect of crushing and modifiing in the process of integration process. Through the experiment, the effect of the modifier type and the amount of modifier on the effect of crushing and modifiing, as well as the effect of feeding speed and feed particle size on the effect of modified effect were examined separately.
Cai Chujiang and others studied the effects of heavy calcium carbonate particles on the properties of heavy calcium carbonate particles on the properties of heavy calcium carbonate particles in the process of integrating airflow crushing with surface modified treatment, the concentration of modified agent solutions and the temperature of crushing airflow, and at the same time studied the effect of these parameters on the rate of heavy calcium carbonate crushing.
evaluation of the effect of calcium carbonate integration process
the effect of the change is evaluated by two indicators: the activity rate and the oil absorption rate, the higher the activity rate, the lower the oil absorption rate, the better the modified effect. The crushing effect is evaluated by product granularity and measured by laser particle size meter. Product performance has changed greatly after the use of air flow shredder ultra-fine and modified integrated process treatment. Product granularity (d50) up to 8.0 m, oil absorption rate of 16.20%, 20 days of water absorption rate of 7.01%, product whiteness slightly decreased, but does not affect its application. Heavy calcium carbonate has been transformed from hydrophobic fillers to oil-hydrophobic fillers.
the main equipment of the calcium carbonate integration process
has been studied, the main crushing and modifiing equipment used is air flow shredder or air flow crusher and surface modifier. In addition, a domestic crushing equipment enterprises through the modified equipment in series after the crushing equipment, crushed powder directly modified treatment, change the previous two-step method for one step to complete, so as to achieve material ultra-fine crushing and modified integration, this integrated process is implemented through the modified crushing unit, with the front of the air flow crusher or air flow crusher and surface modified one machine is different.
The significance of the calcium carbonate integration process
usually to achieve a uniform coating between the modifiers and heavy calcium carbonate, need to be carried out at higher temperatures, longer hours and high mechanical conditions, which in turn will lead to an increase in the production process of calcium carbonate. The grinding process is able to grind particles to form a larger newly generated surface. These newly generated surfaces have high surface energy and are easy to absorb surface modifiers, thus helping to achieve uniform coating of heavy calcium carbonate by modifiers at room temperature. Yang Lei and others focused on the optimization of the modified process of calcium carbonate integration process.
Cai Chujiang and others concluded through the calcium carbonate integration test that surface-modified treatment at the same time as airflow crushing can improve the rate of production of ultra-fine heavy calcium powder, when the crushing air flow temperature is 60 degrees C, the modifier solution in the coupled agent With a mass score of 50% and a modifier solution flow of 1.5mL/min, the crushing rate of heavy calcium particles was increased from 21.0g/min to 56.7g/min, and the rate of material production was increased by 170%. Integrated processes increase productivity and reduce costs.
Tration:
As two important deep processing technologies for non-metallic minerals, the combination of ultra-fine crushing and surface-modified processes is of great significance for strengthening production processes, improving production efficiency, reducing production costs and thus increasing the competitiveness of products.
reference:
Wang Linjiang. Calcium carbonate ultra - fine crushing and surface modified integration process principle
Wang Linjiang and so on. The study of ultra - fine and modified integrated process of heavy calcium carbonate
Cai Chujiang and so on. The integrated treatment of heavy calcium carbonate particle air flow crushing and surface
such as Yang Lei. At room temperature heavy calcium carbonate grinding modified integrated process research
Liu Ronggui and so on. The integrated unit of ultra-fine crushing and modified processing of new materials