US747193A - Indurating stone. - Google Patents

Description

Patented December 15, 1903.

FFICE.

LYNN T. LEET AND CLAUDE A. O. ROSELL, OF NEW YORK, N. Y., ASSIGNORS TO COMPOSITE STONE & BRICK COMPANY, A CORPORATION OF DELA- WARE.

lNDURAT'lNG STONE.

SPECIFICATION forming part of Letters Patent No. 747,193, dated December 15, 1903.

Application filed February 2, 1903. Serial No. 141,585. (No specimens.)

To all whom it m/a/y concern:

Be it known that we, LYNN T. LEET, a citizen of Canada, and CLAUDE A. O. ROSELL, a

citizen of the United States, and residents of New York, in the county of New York and State of New York, have invented a certain new and useful Improvement in Indurating Stone, of which the following is a specification.

This invention relates to a process of makingindurated stone, and refers more particularly to the manner of induration, as will now be described.

At present there are in use two main methods of making indurated stone-the first, in

which dry and loose powdered material is placed in a form without pressure and in which the induration is effected by subjecting the material while in the form to the action of steam, hot water, or both; the second,

in which the material is moistened sufficiently to be capable of molding by mechanical pressure, after which it is formed into articles of desired shape, which are then indurated by means of steam, orin rare cases by air. Our

invention relates to the second of these main methods.

In carrying out this process the constituent ingredients, such as sand and slaked 3o lime, are first mixed, and the mixture is then mechanically molded into articles of desired shape. In this form the articles are not strong enough to be immersed in water or an aqueous solution without disintegration. To

5 overcome this difficulty, we first partly indurate the articles by means of steam for a short period-say two or three hours. After this treatment the articles will be strong enough to stand immersion in a liquid for an indefi- 4o nite period. The partial induration by means of steam is preferably effected in a closed cylindrical vessel. As soon as the articles are strong enough to stand immersion without disintegration water is introduced into the cylinder in quantity sufficient to cover all the partly indurated articles. The supply of steam to the cylinder is continued, so as to substantially maintain the same temperature and pressure as prevailed during the preliminary or partial hardening by means of steam. After the water has been introduced into the cylinder the treatment is continued until the induration is completed, which may take from three to ten hours, depending upon the temperature and pressure used. When the articles are thus soaked-that is, submerged and kept submerged-in the water heated to a high temperature and pressure, the induration proceeds faster than it does when subject to the action of steam only at thesametemperatureand pressure. Besides, the soaking has the advantage that in the liquor may be carried in solution or suspension any of the known indurating agents, such as sodium chlorid, sodium carbonate, calcium chlorid, hydrochloric acid, alum, lime, 850. When lime is used in suspension in water, this mixture is generally called milk of lime, and this makes a good indurating agent.

What we claim as new is- 1. In the art of making indurated stone the improvement which consists in mixing the constituentingredients, forminginto articles of desired shape, partly indurating the same by means of steam as far as steam induration is concerned, and completing the induration by soaking the articles in a liquid at a high temperature and pressure.

2. In the art of makingindurated stone, the improvement which consists in mixing the constituent ingredients, forming into articles of desired shape, partly indurating the same by means of steam as far as steam induration is concerned, and completing the induration by soaking the articles in a liquid containing hardeningmaterial, at a high temperature I and pressure.

LYNN T. LEET. CLAUDE A. O. ROSELL.

Witnesses:

- B. F. KEINARD,

JOHN GALLAGHER.