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Refractory binder
| Details |
Inventors: Cassidy, John Edward;
Assignee: Imperial Chemical Industries Limited (London, EN)
Primary Examiner: Poer; J.
Assistant Examiner:
Attorney, Agent or Firm: Cushman, Darby & Cushman
A solution of an aluminium phosphate binder in a diluent, and refractory compositions containing the solution, the solution comprising aluminium ions and phosphate ions in a molar ratio of Al:P of 0.8:1 to 1.2:1 and other acidic anions (other than oxyphosphorus acid anions), the molar ratio of other acidic anions: Al being in the range 1.3:1 to 2:1. |
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DETAILED DESCRIPTION I claim: 1.
A solution of an aluminium phosphate binder in a diluent the solution comprising aluminium ions and phosphate ions in a molar ratio of Al:P of substantially 1:1 and other inorganic acidic anions, other than oxyphosphorus acid anions, the molar ratio of other acidic anions:Al being in the range 1.
3:1 to 2:1.
2.
A solution as claimed in claim 1 in which the other acidic anions are selected from mineral acid anions.
3.
A solution as claimed in claim 2 in which the other acidic anions are or include halide ions.
4.
A solution as claimed in claim 3 in which the halide ions are or include chloride ions.
5.
A solution as claimed in claim 1 in which the molar ratio of other acidic anions:Al is in the range 1.
5:1 to 1.
9:1.
6.
A solution as claimed in claim 1 in which the concentration of binder in the solution, expressed as the total of aluminium and phosphate, is at least 5% by weight.
7.
A solution as claimed in claim 6 in which the concentration of binder is in the range 10% to 50% by weight.
Description:
This invention relates to binders for refractory materials and to refractory compositions containing the binder.
In our patent specifications British patent specifications Nos.
1,322,724 and 1,357,541 we have described halogen-containing, and especially chlorine-containing, complex phosphates of aluminium, their preparation, and their use as binders in refractory compositions.
Those of the binders which contain aluminium and phosphorus in a molar ratio of substantially 1:1 decompose to give a refractory product most readily.
Moreover, refractories bonded with binders which have this ratio of aluminium:phosphorus have been found to show good slag resistance and spalling resistance.
Consequently, the halogen-containing, and especially the chlorine-containing, aluminium phosphate binders which contain aluminium and phosphorus in a molar ratio of substantially 1:1 are preferred.
The binders specifically described generally contain halogen and aluminium in a molar ratio of substantially 1:1, and the specifications teach that this is the preferred ratio
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Manufacturing Materials 
