Document EoyKwVdkV5zGLnwaxOakQw7g

FILE NAME: Trade Publications (TR) DATE: 1940 May DOC#: TR006 DOCUMENT DESCRIPTION: Trade Journal - Concrete - Cement Mill Section n Charter Member CEMENT MILL SECTION of Associated Business Papers C o n c r e t e , with which has been com bined Cement Age, New York, and Concrete Engineering. Cleveland, is devoted to the Proper Use of Concrete and the Manufacture of Cement. Published Monthly by Concrete Publishing Corporation 400 West Madison Street Chicago, Illinois Telephone CENtral 8822 m Louis Bcookman, /r.. Publisher L. Moeller, Circulation Manager Donald T. Papineau, Promotion Manager R epresen tatives New York City E. Macdonald Bacon 17 West 43th-- Room 909 Longacre 3-3260 Detroit Parker Sl Tarbel! 419 Curtis Bid?.. 2842 W. Crand Blvd. Madison 1540 San Francisco: Don Harway Room 1009, 155 Montgomery St. Exbrook 6029 Los Anseles: Don Harway & Co 318 West Ninth Street Tucker 9706 T h e Cement Mill Edition o f Concrete The Cement Mill Edition of Concrete is edited exclusively for those interested in the manufacture of portland cement and related products. Its pages are devoted to discussions of plant design, management, operation, production, effi ciency, chemical research and control, quarry op eration, progress and news of the industry. The Cement Mill Edition also contains all the material published in the corresponding Regular Edition and so provides news of the uses and merchandising of the materials whose manufacture is discussed in the Mill Edition. The Regular Section furnishes mill operating officials and mill executives valuable points of con tact with the users of the materials they produce. The subscription price is $3.00 a year in the United States and its possessions, and Mexico. One Dollar additional for postage in all other countries. Current copies, 40 cents each. Charter Member Volume 48 m Established 19Q4 M ay, 1940 Number 5 Norman M. S tineman, Editor J. C. W itt, Consulting Editor CONTENTS Crushing Operations Get Much Attention in Cement Manufac ture ........................................................................................................... . 166 Dr. Brown Lectures on Harmful Dusts .................... ... ... 167 Estimating The Amount of Fly-Ash Emission . ...........................168 New York Holds Big Safety Convention ................. .... 169 Small Pioneer Cement Plant Made History in Ohio ...... 170 Sulfate-Resistance of Commercial Cements -- By Philip W. Maxuon...................................................................................................... 171 Lincoln Arc Welding Foundation Awards to Aggregate S2Q0.QQQ 173 There Is No Mystery About Arc Welding--By J- F. Lincoln . . 174 Editorial Discussion ........................... .................................................. 175 Cement from the Home State The Debit Side of Reduced Labor Where Potential Demand Is Big Quicker Chemical Analysis of Portland C em ents............................. 176 Prefers Sedimentation Tube for Measuring Particle-Sixes............. 177 Performance of Portland-Pozzoian Cements in Concrete Work .... 173 Mill Equipment ............. .............................................. ......................... 179 Men and Mills ......................................................................................... 180 Advertisers' Index. Page 48 CONCRETE is indexed in INDUSTRIAL ARTS INDEX, which may be consulted in any Technical or Public Library. Audit Bureau of Circulations C O N C R E T E -- Cement Mill Section -- May. 1940 Copyright, 1940. by Concrete Publishing Corp. Page 165 All-Steel Crusher Unit A new type of all-steel reduction crusher has been announced by a Wis consin equipment manufacturer. This unit operates on the gyratory principle, but the improvement now introduced pro vides a higher speed than formerly. It has been designed to handle large ton nages and large sizes of stone. Even though the new unit is of all-steel con struction, it is said to be of simplified design. Among other features the spider and top shell are cast in one piece, which is readily removable for the replacing of its manganese steel concave ring. Ad justments can be made for taking up the wear on the liner and on the manganese steel mantle. Designers of cement manufacturing plants have recognized the increased im portance of crushing operations-- a point that may be verified when one considers some of the recently constructed or re constructed plants. South America and Texas For illustration, in a large plant re cently completed in Argentina, the nat ural deposit of limestone in the quarrv is drilled with pneumatic jack-hammers and is blasted down and further broken up, if necessary, by means of auxiliary blasting or even with sledge hammers. It is transported to a cableway terminal near the quarry and from there it is transported in cableway buckets for a dis tance of five miles, to the crusher at the plant. At the crushing plant the stone is dumped from the cableway buckets to a 16-in. gyratory crusher which discharges into the raw storage space. A clam-shell with a capacity of 2 cu. yd., operated by a travelling crane, carries the crushed material to the grinding mill bins, from where it is fed to the raw-grinding mills as required. [n a new cement plant recently built in Texas the raw material consists of shell and clay, which is delivered to an adjoining dock by barge. Here the na ture of the shell virtually eliminates primary crushing, inasmuch as the size approximates that of the output of a primary crusher. The shell, when un loaded, is carried by means of a belt conveyor and elevators to a bin directly over a ball mill. The shell is fed to the ball mill with a vibrating feeder, and the mill operates in closed circuit with a vibrating screen. The tailings are re turned to the feed end of the ball mill, and the fine, semi-finished product flows by gravity to a large storage tank from which the feed for the tube mill is taken. A Huge Crusher Unit Reconstruction of the Universal Atlas Cement Company plant- at Leeds, Ala bama (See Concrete, March, 1938, p. 1341, involved the design of a crushing system which utilizes the most mod ern equipment available. The primary crusher is a huge unit described as a 42-in. gyratory crusher which has a rated capacity of about 500 tons an hour. From the primary crusher the rock is dis charged on to a pan conveyor which carries the raw material to a 42 by 66-in. hammer mill. From the hammer mill the crushed stone is carried to the open stor age space by means of a belt conveyor. The raw material storage space provides room, not only for the crushed rock, but for clay, sandstone and shale. The en tire space is served by an electricallyoperated travelling crane having a span of 100 ft. and a lifting capacity of 10 tons, and equipped with a bucket of 3 cu. yd. capacity. This electrically-oper ated crane delivers any of the raw ma terials to their respective storage bins, and proportioning feeders installed be neath the bins carefully control the pro portions of the raw materials by means of a belt conveyor to the rock grinding mill. Dr. Brown Lectures on Harmful Dusts HARMFUL dusts constituted the sub ject-matter of a lecture given on April 23 by Dr. Carlton E. Brown at the University of Maryland. Dr. Brown, who is connected with the U. S. Bureau of Mines, presented his lectures under the auspices of the Uni versity, at the College of Engineering Auditorium at College Park, Maryland. He discussed the occurrence of the num erous kinds of dusts, their effects on hu man beings, the scientific methods used in counting them, and measures recom mended for their control. Dusts are formed by the disintegra tion of solid matter by such processes as abrading, crushing and grinding, Dr. Brown explained. The presence of dust in the air may be objectionable because of its being harmful to breathe, or irri tating to the skin; it may render the air explosive; may increase operating and cleaning costs; and may reduce atmos pheric visibility. The composition arid c o n c e n tra tio n of such dusts as lead, arsenic, antimony, cadmium, and manganese are determined by well-established analytical proced ures. The concentration of such sub stances as free silica and asbestos is de termined usually by the use of exceed ingly ingenious counting procedures, and occasionally by gravimetric procedures. The application of petrographic, spectrographic, and X-ray procedures to the determination of the composition of these substances, difficult to determine by chem ical procedures, is increasing. Micro scopic measurement, air and liquid lu triation. and various indirect optical and other methods are used to obtain infor mation on the size-properties of dust. The harmfulness of dusts may be controlled by such measures as substi tution of a non-injurious dust-forming material for the harmful or objection able material; prevention of formation of dust; prevention of dissemination of dust into the air by the use of wa ter, wetting agents, exhaust hoods, or good housekeeping; ventilation; removal of dust from the air by filtration, elec trical precipitation or other means; and Itv the use ot respirators. C O N C R E T E -- Cement Mill Section -- May, 1940 American Chemical Exposition Scheduled for Chicago CHEMISTRY and the chemical indus try will feature the American Chem ical Exposition by the Chicago Section of the American Chemical Society an nounced by R. C. Newton, of Swift and Company, chairman of the committee in charge, at the meeting of the Chicago Section held at Chicago on March 29. Plans for the first Exposition, to be held December 11 to 15, 1940. at the Stevens Hotel, have been perfected by a committee of ten and approved by the Board of the Chicago Section. Emphasis will be placed on chemical products and scientific exhibits will be included. The plan is to make this the first of a series of expositions to be held in even-numbered years to alternate with the Exposition of Chemical Industries in New York. Approximately 32.000 sq. ft. will be available for exhibits and some 300 ex hibitors are expected. Offices of the Ex position have been opened by the com mittee at 110 North Franklin Street, Chicago, Illinois, with M. W. Hinson in charge as manager of the Exposition. Page 1G7 in 1S3W*!!!!' C U N I ri L I L For Better Concrete ! Pipe-- Use WELDED Reinforcing Mesh-- Advertisers' Index T h e A lla n P o r ta b le S p o t W e ld in '? Outfit can b e used riq h t on th e Job speedily, efficiently, d epend ably-- on all sizes of w ire. T his electric w eld ing m achine elim inates old-fashioned tyin g m ethods, prevents cracking, and in creases pipe strength. AU Machines Now WATER COOLED Ca'.es being welded by A llan Portable W elding M achine W r i t e f o r deCatl A LIA N MANUFACTURING AND WELDING BUFFALO, NEW YORK CO. kn ultra-modern hostelry in the heart of Chicago , Allan M ig. & W elding Company .. . .............. 48 American Colloid Co........................... ............................................ 38 A nchor Concrete Mchy. Co............................................................ A nchor Div. of Consolidated Concrete M achinery Corp . .. 40 Autom atic Spring Coiling Co.................................................... 37 Berg Vault Co............................................................................ 38 Besser Manufacturing Co............................................ ........... ... 40 Bism arck Hotel ......................................................... ........................ 48 B lack & Decker Mfg. Co................................................................. 2 B utler Bin C o ._ ......... .................................................................... 35 Calcium Chloride Assn............................................................................. Chain Belt Company................................................... 39 C. H. & E. Mfg. Co.............................................................................. 37 Clark T ru ctractor ............................................................................ 21 Classified L in e r s ......................................................................... 47-180 I Coddington Mfg. Co., E. D ............................................................... 37 Colorcrete Industries, Inc.................................................................. 31 , Commercial Shearing & Stamping Co............................................ 32 s Concrete Equipment Co....- ................................. 33 Consolidated Concrete MachineryCorp....................................... 40 Construction Machinery Company....................................................... Conwell. E- L., Co............................................................... 38 Douglas F ir Plywood A ssn.......................................................... - . O F oote Foundry Co., j . B ..................... .................. ....................... 36 Hansen Co.. L ........................................ 47 Harshaw Chemical Co., T h e ...........................................- ............ 38 B lM it t m HOTEL Emil Eitel Karl Eitel k Roy Steffen Ideal Div. of Consolidated Concrete M achinery C o rp ......... 40 Iron & Steel Products, In c................................................................ 180 Jaeg er M achine Company, T h e .............................................. 27-J7 K irk & Blum Mfg. Co.. T h e ....................................................... 39 K oehring C om p an y .............................................................................. 32 Construction Contracts . . . What should they cover? How can they be simplified? How can they effectively provide against hazards? How can administrative respon sibilities be made plain? Lehigh Portland Cement Co..................................... 25 Living-Stone C o.................................................................................. 47 L & M Mfg. Company............................................................ 47 Lone S tar Cement Corp................................................................... 11 Mall T ool C o........................... 31 Marquette Cement Mfg. Co................................................................ 16 Medusa Portland Cement Co........................................................... 19 Mepham, Geo. S., & Corp.................................... ............................ 39 Miles M fg. Co.......................... .3 5 Multiplex Concrete Mchy. C o........................................................... 35 National Chemical & M fg. C o ............................. ............................ 15 Here is a practical aid--a tool ta save architects, engineers, and builders money New Holland Machine Co........... ..................................................... 36 Noble, Thos. W ............................................................... ....... . . . . in the work of preparing contracts and in making them more logical Olsen, Eugene F ............................................ 23 and effective in the functions they must perform. -- Just Out -- i Pennsylvania-Dixie Cement Corp.................._................................... I Portland Cement A ssociation........................................................... 26 j Professional Service ........................................................................... 38 Business Methods in the Building Field By Schobinger and Lackey-- $3.50 1 Reed Co., R . F ...................................................................................... 33 i Ricketson Mineral Color W o rk s.................................................. 38 Ryerson, Jo s. T ., & So n ......................................... 39 I Sasgen D errick C o.............................................................................. 38 , Skilsaw, In c.................................................................................................. Sm ith Co., T . L ............................................................................ 31 A practical manual of business methods and documentary procedure ' Specialties ........................................................................................... 38-47 in the development and execution of industrial, power and building : Stanley W orks, T h e .................................................................. .2 8 projects. The book covers the range of contract documents and pro Stearns Mfg. C o.......................................................... 23 vides useful checking lists, as well as specimen forms for a complete Stonex In d u stries....................................................... 16 building project. It also analyzes the relations of all parties to the Superock Co-, T h e ........................ ................................ .. .. 29 work and is therefore useful to owner, architect engineer, builder and subcontractor. Tam m s Silica C o......................................................................................38 CONCRETE PUBLISHING COMPANY BOOK D EPA R TM EN T 4 0 0 WEST MADISON STREET CHICAGO, ILLINOIS U niversal Div. of Consolidated C oncrete M chy. Corp. . 40 W aylite Co., T h e .................... ....... . ...................................... 29 W ay lite-Su p ero ck ................................................................................ 29 W illiam s, C. K., Co............................................................................... 39 You can hits zeith confidence iront C O N C R E T E advertisers