US515017A - Slaking lime - Google Patents

Description

UNITED STATES- PATENT OFFICE.

ERNEST LESLIE .RANSOME, OF OAKLAND, CALIFORNIA.

I .SLAKING LIME.

SPECIFICATION forming part of Letters Patent No. 515,017,dated February 20, 1894..

' Application filed April 6, 1893. Serial No. 469,318, (No specimens.)

To all whom it may concern:

Be it known that I, ERNEST LESLIE RAN- SOME, a citizen of the United States, residing at Oakland, in the county of Alameda and State of California, have invented certain new and useful Improvements in SlakingLime; and I do hereby declare that the following s a full, clear, and exact description of the lnventlon, which will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to a processof burning and slaking lime.

My process primarily relates to the utiliza-p tion of combustible refuse. On the th of July, 1885, Letters Patent No. 322,559 were granted to me, for the manufacture of bricks I from the waste products of combustion, un-

der which the necessary amount of lime needed was burned with the refuse. This part of .the process had to be abandoned by reason of the cost and diffioulty experienced in thoroughly slaking the lime after it had been by the amount of moisture is readily under control. The fire is kept near to the top of the furnace, by retarding the withdrawal of theburnedmaterial. The current of moistened air in its upward passage through the burned material, cools it, and in consequence becomes heated; and in this heated condition upon reaching the hot lime, that has just been rendered caustic in its passage through the fire, the hot vapor immediately and thoroughly slakes the lime while the mass of burned matter containing the slaked lime gradually passesdown and out of the furnace. I so regulate the quantity of moisture in the current of air that while ample is added to insure a thorough slaking of the lime, and for the purposes of combustion hereinafter mentioned, yet it is so limited as to prevent the burned mass from becoming too damp or wet for grinding. Owing to the heat in the furnace causing the upward current of air to become warmer as it passes through the burned mass, there is no difficulty whatever in thus regulating the quantity of moisture.

The proportion of lime to the fuel greatly varies, dependent upon the character of the fuel and the use to which the resultant ash One great benefit of this process, in addition to the chief one of slaking the lime, is that by this method the resultant clinker does not concrete or mass together in the furnace so much as it otherwise would, and thus its withdrawal is more easily accomplished.

In carrying out this process I do it by preference in the furnace of a fuel gas producer, wherein the fuel with its proportion of lime is fed in at the top and withdrawn at the bottom after the manner of a continuous kiln; because in such a furnace the fuel is more thoroughly decarbonized, the surplus heat is easier utilized, and the fumes of the refuse are rendered inoxious, while the carbonic acid given off from the lime improves the quality of the fuel gas; whereas in an ordinary furnace it is but a detrimental waste. I do not, however, limit my invention to any particular furnace, nor do I confine this process to the burning of lime carbonate only, for other limes that are rendered caustic by the action of fire will answer the same purpose.

withdrawn from thefurnace in which it was burned substantially as described.

ERNEST LESLIE RANSOME.

. Witnesses:

F. LESLIE RANSOME, BERNARD RANSOME.

Having fully described my invention, what I claim, and desire to secure by Letters Patcut, is-

The process of slaking, disintegrating and 5 cooling the clinker produced in burning coinbustible matter containing lime by passing steam through the burned mass before it is