A kind of preparation method of decolouring special-purpose nanometer aluminum oxide

A kind of preparation method of decolouring special-purpose nanometer aluminum oxide

  • CN 107,162,030 A
  • Filed: 06/28/2017
  • Published: 09/15/2017
  • Est. Priority Date: 06/28/2017
  • Status: Active Application
First Claim
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1. a kind of preparation method of decolouring special-purpose nanometer aluminum oxide, it is characterised in that comprise the following steps:

  • (1) under mechanical stirring, concentration is calculated as 30~200g/L liquor alumini chloridi and concentration in terms of aluminum oxide by aluminum oxideIt is transported to for 50~350g/L sodium aluminate solution cocurrents in synthesis reactor, control temperature carries out neutralization reaction at 60~90 DEG C;

    (2) in N-process, the solution of cocurrent being subjected to pH and alternately changed, first biasing sodium aluminate solution controls pH 10~12, then stop biasing sodium aluminate solution and stablize 10~20min;

    Again plus hydrochloric acid controls pH 3~4, stop plus hydrochloric acid stablize 10~20min, so alternately changes and is once circulated for one, repeat the circulation 2~6 times, neutralization terminates, reaction end pH is stable 6~9, aging is then carried out, boehmite of the primary particle diameter in 2~30nm is formed;

    (3) washed after aging terminates, the pH that cleaning solution is adjusted during washing prepares acid, neutral or alkalescence the thin water aluminium of planStone;

    (4) boehmite after washing is dried at a temperature of 120 DEG C;

    (5) by the boehmite after drying in rotary kiln at a temperature of 500~800 DEG C, be calcined 3h;

    (6) boehmite after roast is naturally cooled to after room temperature, is sieved, and obtains acid, neutral or alkalescence de-Color special-purpose nanometer aluminum oxide.

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