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US 4,047,968 AGranted
Method for the production of synthetic wollastonite materials
AssigneeDyckerhoff Zementwerke Aktiengesellschaft
InventorsHeinrich ZURStrassen, Eberhard Rauschenfels
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Abstract
A method for the production of synthetic wollastonite material. The treatment involves slag melt which is obtained during the thermal production of phosphorous from crude phosphate. This slag is then treated with water under a preferred embodiment and burned at a certain temperature in an oxidizing atmosphere.
Claims9
The method of producing steam hardened calcium silicate building materials, comprising
- steam hardening a synthetic wollastonite material,
- said wollastonite having been produced prior to its said steam hardening by a process which includes the steps of quenching in water the slag melt obtained during the thermal production of phosphorous from crude phosphate, and then burning the quenched melt in the substantial absence of phosphate slime in a rotary kiln at a temperature of about 1100.degree. C in an oxidizing atmosphere for a period of time sufficient to produce a clear change in color.
The method of brightening bituminous pavement in road construction, comprising
- combining with bituminous paving material a synthetic wollastonite material,
- said wollastonite having been produced prior to its said use by a process which includes the steps of quenching in water the slag melt obtained during the thermal production of phosphorous from crude phosphate, and then burning the quenched melt in the substantial absence of phosphate slime in a rotary kiln at a temperature of about 1100.degree. C in an oxidizing atmosphere for a period of time sufficient to produce a clear change in color.
Dependencies are inferred from the claim text.