Mechanism of calcium carbonate integration process
Wang Linjiang used airflow pulverizer as the main equipment, and superfine pulverization and surface modification treatment of heavy calcium carbonate at the same time, and revealed the mechanism of the integrated process of calcium carbonate: the high-speed airflow acts on the mechanical energy of the mineral, and the part is used for pulverization. Minerals, another part used to change the mineral lattice and surface properties, activate the mineral surface, facilitate the adsorption and chemical bonding between the mineral surface and the modifier, so that the modifier molecules uniformly coat the mineral surface. At the same time, the modifier can play a role in grinding during the pulverization process, which is beneficial to ultrafine pulverization. The surface free energy of the modified mineral is greatly reduced, and the reduction of the surface free energy leads to the minimum stress reduction of the pulverized fracture of the granule. The smashing becomes easy and the effect is improved.
Factors affecting the integration of calcium carbonate
After analyzing the process mechanism, Wang Linjiang discussed several factors affecting the effect of pulverization and modification in the integrated process. The effects of modifier type and modifier dosage on the pulverization and modification effects, as well as the effects of feed rate and feed size on the modification effect were investigated .
Cai Chujiang et al. studied the effect of modifier solution flow rate, modifier solution concentration and pulverized gas flow temperature on the properties of heavy calcium carbonate particles during the integrated process of jet pulverization and surface modification . The effect of these parameters on the rate of crushing and discharging of heavy calcium carbonate was also studied .
Evaluation of the effect of integrated calcium carbonate process
The modification effect was evaluated by two indexes: activation rate and oil absorption rate . The higher the activation rate and the lower the oil absorption rate, the better the modification effect. The pulverization effect was evaluated by product particle size and measured by a laser particle size analyzer. The performance of the product after the ultrafine and modified integrated process of the jet mill has changed greatly. The product particle size (d50) is 8.0μm, the oil absorption rate is 16.20%, and the water absorption rate is 7.01% in 20 days. The whiteness of the product is slightly decreased, but it does not affect its application. Heavy calcium carbonate has been converted from a hydrophilic filler to a lipophilic hydrophobic filler.
Main equipment for calcium carbonate integration process
In the existing research, the pulverizing and modifying equipment used mainly includes a jet mill or a jet pulverizing and surface modification integrated machine. In addition, a domestic pulverizing equipment enterprise directly modifies the pulverized powder by connecting the modified equipment in series with the pulverizing equipment, and the conventional two-step method is completed in one step, thereby realizing the superfine pulverization and modification integration of the material. This integrated process is implemented by a modified pulverizing unit, which is different from the previous jet pulverizer or jet pulverizing and surface modification integrated machine.
The significance of calcium carbonate integration process
It is usually desirable to achieve a uniform coating of the modifier with respect to the heavy calcium carbonate, which needs to be carried out at higher temperatures, longer times and higher mechanical forces, which in turn leads to an increase in the production process of the heavy calcium carbonate. The grinding process is capable of grinding the particles to form a large newly formed surface. These newly formed surfaces have high surface energy and are easy to adsorb surface modifiers, thus facilitating uniform coating of heavy calcium carbonate by the modifier under normal temperature conditions . Yang Lei et al. focused on the optimization of the modification process by the integration process of calcium carbonate .
Cai Chujiang et al. concluded through the calcium carbonate integration test that the surface modification treatment while airflow pulverization can increase the discharge rate of ultrafine calcium powder . When the pulverization gas temperature is 60 ° C, the coupling in the modifier solution When the mass fraction of the agent is 50% and the flow rate of the modifier solution is 1.5 mL/min, the crushing and discharging rate of the heavy calcium particles is increased from 21.0 g/min to 56.7 g/min, and the discharge rate is increased by 170%. An integrated process increases productivity and reduces costs.
summary:
As two important deep processing technologies for non-metallic minerals, the combination of ultra-fine pulverization and surface modification processes is of great significance for strengthening production processes, improving production efficiency, reducing production costs and increasing product competitiveness.
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