The production process of molecular sieve

The production process of molecular sieve

Molecular sieve is a synthetic with the role of molecular screening of hydrated silicon aluminate, with high adsorption capacity, strong selectivity, high temperature resistance and other use characteristics, the scope of application is also wide, in order to make everyone to have more understanding of it, we below from its production process to understand.

1 molecular sieve powder production process mainly includes the preparation of sodium aluminate, synthesis, aging and crystallization, mother liquor separation and washing, drying and packaging five stages. Preparation of sodium aluminate: a certain amount of liquid alkali or steam parent is added to the reaction kettle, heated to the preparation temperature under stirring, and then the temperature of aluminum hydroxide is added at a certain temperature. The alumina hydroxide solution was prepared under the condition of sodium aluminate. After the preparation, a certain amount of mother liquor was added to adjust the concentration of sodium aluminate solution, so as to meet the raw material requirements of the product powder in the synthesis process. Sodium aluminate solution filtered by two steps was used to synthesize molecular sieve powder.

2. Synthesis: there are 6 kinds of substances in the synthesis stage, namely liquid alkali, sodium aluminate, mother liquor, sodium silicate, water and guiding agent. According to the production process ratio will be six kinds of materials into the synthesis tank, and the reaction will be stirred for about 1 hour the product raw material powder has the skeleton characteristics of molecular sieve, but in the hole filled with a large number of water molecules, so it can not be used directly. Only most of the water in the channels is left behind by high temperatures. After being drained, it can be used to adsorb other molecules.

3. Aging and crystallization: after the slurry in the synthesis tank is stirred by the molecular sieve, it is pumped into the crystallization tank and heated by steam under stirring. According to the process requirements, the heating temperature and aging and crystallization time are controlled. Stir the discharge into the buffer tank.

4. Separation and washing of mother liquor: the slurry is separated from solid liquid through the filter to collect the filtrate. Air pressure washing and dehydration. When the water reaches 30-32% of the attached water, the air pressure stops and the filter cake enters the filter cake circulation chamber.