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Powders handling and minor ingredient premixing

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Sodium silicate digester

The digester uses direct injection of steam at 6 bar to dissolve sodium silicate rock in water to produce approx. 2.5 tonnes of solution.

The finished product is blown out of the vessel (under it's own head of steam, or with compressed air, if the vessel has cooled) to a storage tank via a plate heat exchanger. The heat exchanger reclaims the heat from the product and heats the water for the next batch, as well as ensuring the product is cool (to minimise evaporation loss, and reduce the chance of injury due to scalding).

Included in the system is :-

  • the digestion vessel.
  • steam reducing station.
  • sampling station enabling sample to be taken while digestion is in process.
  • product storage tank.
  • hot water storage tank.
  • bursting disk safety system.
  • water dosing system.
  • PLC control of steam injection time and safety interlocks.
  • overhead hoist for dispensing the rock (from 1 tonne bulk bags).

Contact Information


Home page

Office phone
+64 6 3049 203

Mobile phone
+64 21 43 63 53

Mobile fax number
+64 21 690 353

Postal address
32 Kuratawhiti St, Greytown 5953, Wairarapa, NEW ZEALAND

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Last updated 13th September 2004

© Peter Thompson. 2000, 2001, 2002, 2003, 2004