US718729A

US718729A - Process of making cement.

Info

Publication number: US718729A
Application number: US4671601A
Authority: US
Inventors: Henrik Emil Ruesager
Original assignee: Individual
Current assignee: Individual
Priority date: 1901-02-09
Filing date: 1901-02-09
Publication date: 1903-01-20
Anticipated expiration: 1920-01-20

Description

grinding the separate ingredients.

UNITED STATES QATENT OFFICE.

HENRIK EMIL RIlSAGER, OF FREDERIKSBERG, NEAR COPENHAGEN, DENMARK.

PROCESS OF MAKING CEMENT.

SPECIFICATION forming part of Letters Patent No. 718,729, dated January 20, 1903.

Application filed February 9, 1901. Serial No. 46,716. (No specimens.)

To all whom it may concern:

Be it known that I, HENRIK EMIL Rt'isAGER, of Frederiksberg, in the Kingdom of Denmark, have invented certain new and useful Improvements in Processes of Making Cement, of which the following is a specification.

The object of this invention is to provide a simple and economical process of making cement; and for this purpose the invention consists in the steps of grinding separately the ingredients of the cement in their natural humid state, simultaneously grinding and mixing said ground ingredients together in the presence of a limited quantity of water, calcining the resulting sludge to clinker, and pulverizing said clinker.

In carrying out the process the first step is The raw materials are subjected in their natural humid state in which they are quarried or dug and without artificial drying to this preliminary reduction, which is carried as far as the natural qualities of the materials themselves permit. The ground raw materials are then mixed and ground together. This operation is accomplished in the presence of a Very limited quantity of watersay one part to every three parts of solid matterand this operation of simultaneous mixing and grinding together is advantageously effected in tubular ball-mills. The result is a thick dense sludge in which the constituents are extremely finely subdivided and homogeneously and intimately mixed. This sludge is then dried and burned (calcined) into clinker. The clinker is then ground to an impalpable'powder and forms the product of the process.

This process carried out inactual manufacture and on a large scale has demonstrated that even in the case of raw materials the hardest and most difficult to work a most finely subdivided and homogeneous product is obtained under a consumption of power approximately one-half that necessary for obtaining even a tolerably good result by the dry process as heretofore commonly carried on. By the operation of grinding and mixing the raw materials into a paste or sludge the small particles are brought so closely in contact and are so intimately mixed that the chemical reaction is easily and perfectly accomplished, the paste shrinking as the moisture evaporates and bringing the particles of the different constituents in close mutual contact. As compared with the dry process heretofore employed the preliminary drying of the raw materials is avoided, a better and more intimate mixing of the constituents is obtained, by which the quality of the cement is greatly improved, and great economy in power and fuel consumption is obtained. As compared with the well-known wet process there is a very great saving in fuel and labor.

In case one of the raw materials is soluble in water it may be dissolved in the water added to the other materials in the ball-mill instead of being introduced therein in powder form, thus facilitating the reaction.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. The process herein described of making cement, which consists in grinding separately the raw ingredients in their natural, humid state, into a powder as fine as the moisture present will reasonably permit, simultaneously grinding and mixing the thus coarselygronnd ingredients together in the presence of a small quantity of water sufficient to form a sludge of a creamy consistency, calcining the said sludge to clinker, and pulverizing said clinker, substantially as set forth.

2. The process herein described of making cement which consists in grinding separately the raw ingredients in their natural, humid state, dissolving one of said ingredients in a small quantity of water, simultaneously grinding and mixing the remaining ingredients with said solution so as to form a sludge of a creamy consistency, calcining the resulting sludge to clinker and pulverizing the said clinker, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.

I-IENRIK EMIL RtisAeER.

Witnesses:

ERNEST BOUTARD, P. HOFMAN BANG.

Afiidavit having been filed showing that the name of the patentee in Letters Patent No. 718,729, granted January 20,1903, for an improvement in Processes of Making Cement, should have been Written and printed Henrik Emil Riz'sager instead of Henrik Emil Rusager, it is hereby certified that the proper correction has been made in the files and records pertaining to the case in the Patent Office, and should be read in the Letters Patent that the same may conform thereto.

Signed and sealed this 31st day of March, A. D., 1903.

[SEAL] F. I. ALLEN,

Commissioner of Patents.