We have a soda ash mixing plant that we want to use to make up batches of soda ash solution, and use this for pH control. The mixing plant consists of 2 x 900 litre tanks fitted with electric mixers. We will fill each tanks with 900 litres water, then add about 200 kg of dense soda ash powder to each tank. This gives a solution pH of about 11.8 when mixed. Can anyone advise how long this solution should be mixed to ensure that the powder is completely dissolved. Also, once the solution is mixed, if it is not used for some time and just sits in the tanks, can the soda ash re-crystallise and settle out in the bottom of the tank? Appreciate any advice.
- posted
17 years ago