Decomposition rate and granularity are both judgmentsaluminum hydroxideIn actual production, there will be many factors that affect performance, such as the production environment, production process, and the quality of raw materials. The decomposition rate and particle size are mainly affected by temperature.
(1) Effect of decomposition temperature on particle size
Increasing the temperature greatly increases the crystal growth rate. When the supersaturation of the solution is the same, the crystal growth rate of aluminum hydroxide is about 6 to 10 times higher at 85 degrees Celsius than at 50 degrees Celsius. High temperature can reduce the generation of new crystal nuclei, so that the resulting product size, strength is larger.
(2) The effect of temperature on the decomposition rate of aluminum hydroxide
Temperature control has a great influence on the technical and economic indicators and product quality of the carbon separation process. Determining and controlling the temperature is one of the main tasks of the carbon separation process. According to the sodium oxide-alumina-water system equilibrium diagram, a certain composition of sodium aluminate solution, with the decrease of temperature, the degree of supersaturation increases, and thus the decomposition rate increases. When other conditions are the same, a higher decomposition rate and unit capacity of the decomposition tank can be obtained.
The experiment shows that the decomposition speed reaches a large value at about 30 degrees Celsius, and the temperature is further reduced, because the solution viscosity is significantly increased, the solution stability is increased, and the decomposition speed is reduced. If the decomposition is carried out at a constant lower temperature, aluminum hydroxide with a small particle size will inevitably precipitate. Therefore, a reasonable decomposition temperature should be determined.
As far as the decomposition rate is concerned, if the initial temperature is high and the temperature cannot be reduced rapidly, the decomposition rate will decrease rapidly due to the reduction of supersaturation of the solution, thus affecting the decomposition rate. Therefore, the decomposition rate can be increased within a predetermined time by lowering the decomposition initial temperature.
From this we can see that in the production of aluminum hydroxide, the temperature control is very important, otherwise it may affect the use of products and performance.