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What are the main physical and chemical changes in the calciner?

Release time: June 29, 2020 14:47:13 Number of visits: 198

Calcination is High temperature furnace The main process. As for the principle of calcination, many people are not very clear. Let me talk about the principle of high temperature furnace.

Calcination: heat treatment in air or inert gas flow at a certain temperature is called calcination or roasting. Calcination is the process of pyrolysis or crystal transformation of natural or artificial compounds; at this time, the compound is dissociated into simpler compounds or undergo crystal transformation by heating. The thermal decomposition of carbonate is called roasting. The calcination operation can be used to process mineral raw materials directly to meet the requirements of subsequent processes, and can also be used to prepare chemical concentrate in the post-treatment of chemical beneficiation to meet the requirements of users for products.

The main physical and chemical changes during the calcination of high temperature furnace are as follows:

Thermal decomposition. Remove volatile impurities, such as chemically bonded water, CO2, NOx, etc. At higher temperatures, solid-state reactions may also occur to form active compound states. Recrystallization can obtain certain crystal form, crystal size, pore structure and specific surface area. In order to increase the mechanical strength of microcrystalline sintering.

The main factors affecting the calcination process of high temperature furnace are: calcination temperature, gas phase composition, thermal stability of compounds, etc. Therefore, according to the thermal stability of various compounds, such as carbonates, oxides, hydrogen sulfide hydroxides, oxysalts, etc. The composition of some compounds can be changed selectively by controlling the calcination temperature and gas phase composition. The crystal transformation occurs, and the impurities are removed and the useful groups are separated and enriched by corresponding methods.

Sometimes the temperature uniformity of high temperature furnace is poor. What is the cause? What should I do?

The reasons for poor temperature uniformity of high temperature furnace are as follows:

1. Unreasonable power distribution;

2. The electric heating element is damaged;

3. The distribution of electric heating elements is unreasonable;

4. Unreasonable furnace structure will lead to excessive local heat dissipation;

5. Poor sealing of furnace and excessive heat dissipation in local area;

6. Uneven gas circulation or insufficient wind power in the furnace with fan;

7. The bottom temperature is low;

8. The heating power is out of phase and the fuse is damaged.

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