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US 5,248,387 AGranted
Process for producing concentrated aqueous slurries and spray dried particulate products
AssigneeNiro A/S
InventorOve E. Hansen
Life of this patent
Estimating the term…
Abstract
An improved process and apparatus for producing concentrated kaolin slurries and spray dried kaolin particulates through the use of an arrangement where an evaporation system for producing concentrated slurries is coupled with a spray dryer such that off gases from the spray dryer are used to supply heat energy to the spray dryer and to the evaporation system.
Claims8
A process for producing a concentrated aqueous slurry and a particulate product comprising the steps of:
- delivering a feed slurry to an evaporation system including at least one heat exchanger heated by a fluid and a heat recovery unit for heating said fluid,
- evaporating water from said feed slurry in said evaporation system to provide a concentrated aqueous slurry,
- providing hot gases of combustion by burning a fuel with an oxygen containing gas in a burner,
- delivering said hot gases to a spray dryer,
- feeding said concentrated aqueous slurry to an atomizing device in said spray dryer and atomizing said slurry,
- drying atomized particles of said concentrated slurry in said spray dryer,
- withdrawing said particles and hot gases from said spray dryer and delivering hot gases together with particles entrained therein to a particle separator,
- withdrawing said particles from said particle separator as a particulate product,
- withdrawing said hot gases from said particle separator,
- delivering a first portion of said hot gases withdrawn from said particle separator together with hot gases provided by said burner to said spray dryer, and
- delivering a second portion of said hot gases withdrawn from said particle separator to said heat recovery unit of said evaporation system.
8 more elements
A process for producing a spray dried particulate product comprising the steps of:
- providing hot gases of combustion by burning a fuel with an oxygen containing gas in a burner,
- controlling the quantity of said oxygen containing gas supplied to said burner to provide a minimum quantity of oxygen required for efficient combustion of said fuel,
- delivering said hot gases to a spray dryer,
- feeding an aqueous mineral containing slurry to an atomizing device in said spray dryer,
- atomizing said slurry and drying said slurry by exposure to said hot gases in said spray dryer to produce dried particles of said mineral,
- withdrawing said particles and hot gases from said spray dryer and delivering said particles and hot gases to a particle separator,
- withdrawing said particles and hot gases from said particle separator as a product of said process, and
- delivering a portion of said hot gases withdrawn from said particle separator together with hot gases provided by said burner to said spray dryer, whereby at least a portion of said hot gases delivered to said spray dryer are recycled and the oxygen content of said hot gases delivered to said spray dryer from said burner is minimized.
5 more elements
Dependencies are inferred from the claim text.