This article introduces the mechanical method of a high-specific surface area calcium hydroxide production line, including its process flow, equipment composition, preparation method, and performance characterization.
Overview of high specific surface area calcium hydroxide
High-specific surface area calcium hydroxide is a highly active calcium hydroxide. Due to its large specific surface area and high activity, it has broad application prospects in sewage treatment, flue gas desulfurization, denitrification and other fields.
Preparation method of high specific surface area calcium hydroxide
Currently, there are many methods for preparing high specific surface area calcium hydroxide, among which the mechanical process is the most commonly used. The automated way mainly uses mechanical force to break, grind, and refine calcium hydroxide particles, thereby increasing their specific surface area and activity.
Process flow
The process flow for mechanically preparing high specific surface area calcium hydroxide includes the following steps:
(1) Add the calcium hydroxide raw material into the high-speed mixer and stir and grind thoroughly;
(2) Transport the stirred slurry to the spray dryer for spray drying;
(3) Transport the dried powder to the ebullating bed for high-temperature sintering;
(4) Grind and screen the sintered product to obtain a high specific surface area of calcium hydroxide.
Equipment composition
The equipment for mechanically preparing high specific surface area calcium hydroxide mainly includes the following parts:
(1) High-speed mixer: used to stir and grind calcium hydroxide raw materials;
(2) Spray dryer: used to spray-dry the stirred slurry;
(3) Ebullating bed: used for high-temperature sintering of dried powder;
(4) Pulverizer: used to grind the sintered products;
(5) Screening machine: used to screen the crushed products.
Preparation method
The preparation method of mechanically preparing high specific surface area calcium hydroxide is as follows:
(1) Add the calcium hydroxide raw material into a high-speed mixer, add an appropriate amount of water and dispersant, and stir and grind thoroughly;
(2) Transport the stirred slurry to a spray dryer and obtain calcium hydroxide powder through spray drying;
(3) Transport the calcium hydroxide powder into the ebullating bed and sinter it at high temperature;
(4) Grind and screen the sintered product to obtain a high specific surface area of calcium hydroxide.
Performance Characterization
The performance characterization of high specific surface area calcium hydroxide mainly includes the following aspects:
(1) Specific surface area: Use the BET method to measure the specific surface area;
(2) Activity: Use chemical titration to measure activity;
(3) Particle size distribution: Use a laser particle size analyzer to measure particle size distribution;
(4) Phase composition: Use X-ray diffractometer to measure the phase composition.