Document ByqEjBRxVb3k6QzZXv3zqEx9j

Rock Products PLAINTIFF'S EXHIBIT JM 1059 April 26, 1930 iiiiiiiiiiiimiiiiimuitinnna Foreign Abstracts and Patent Review Influence of Fluxing Materials on Grind ing. The fluidity of the slurry prepared in the plant for producing portland cement clinker depends to a considerable degree upon the extent to which the raw materials entering the mill can he disintegrated by washing. An investigation was made to de termine the influence of the fluxing material on the disintegration rate of a mixture of marl and chalk (76% CaCCM in the wash mill. The grinding tests were conducted on raw materials in laboratory type ball mills. The marl and chalk were crushed in a Rlack crusher and passed over screens having 1and 4-mcsh per sq. cm., respectively. The overs of marl and chalk ttfton the 4-mesh screen were then mixed together in the re quired proportion. Then two hatches, each of 1 kg., were weighed out and placed in two porcelain drums of similar size which con tained porcelain balls of like weight and number. One drum received water without any fluxing material; the other drum re ceived a 0.04 A' N'a,COa and a 0.1% mo lasses solution (based on the weight of the weight of the slurry). Both drums, her metically sealed, were placed in the same mill. Grinding was maintained for 30 minutes. A screen analysis and an analysis by elutriation was then made in the Schoene ap paratus. The results are given in Tahle t. TABLE I--GRINDING ANALYSIS OF RAW ,, Sewn SLURRY (per sq. Si*r nf ----------- Percentage - - -- cm.) and granule* With flux- Without fractions mm. mg material fluxing material 4 mesh >3 21.56 2<>.27 -5 mesh 3-1.2 0.A2 1.12 64 mesh 1.2-0.75 0.08 f.f.t T20 mesh 0.75-0.54 0.05 ft.07 400 mesh 0.54-0.30 n.lft 0.12 900 mesh 0.30-0.20 0.00 0.11 IV fraction 0.20-0.04 2.1ft 2.79 F T F fraction 0.04-0.025 II fraction 0.025-0.01 0.77 4.43 1.62 9.24 I traction underft.Ol 70.00 5.9.53 They indicate the accelerating influence which the fluxing material exerts upon the reduction in size of the raw material. The effect of the action of the electrolytes may be increased by first heating the water which is to be used; the water is thus con siderably softened. In order to decrease the volume of water used in the slurry in actual operation, soda and molasses ,can he used individually or in various mixed proportions, in dependence upon the condition of the water. The introduction of the electrolytes decreases the consumption of fuel, increases the output of the kiln, crushers and pumps, and calls for smaller bins and tanks.-- Zcmcnt (1930). 19, S, p. 96. Investigation of Concrete Building in Prague. In October, i928r newspapers the world over carried the news that a corner building being erected of reinforced con crete in Prague, Czechoslovakia, had col lapsed and killed 46 people. According to the legal opinion of the investigating expert. Prof. Rudolf Kukac, Prague, the collapse of the building under construction was due partly to faulty mixing and pouring of the concrete and to weaknesses in design. Ac cording to the evidence, there was nothing wrong with the cement, but plenty with the men in charge.--fle/on . Eiseu (1929) 24, pp. 447-448. Sand-Lime Brick Production. The au thor gives the elementary principles relat ing to the production of sand-lime products, from the preparation of the raw material to the finished material. According to the ex periences of Leduc, the purity of sand ex erts a great influence upon the strength of tlie product obtained. Products made with siliceous sand have a strength of 180 kg. per sq. cm.; but it 10% clay is added, the strength is only 110 kg.: and when 10% limestone (CaCOi) is added, it is only 107 kg. Cinders and slag are used in sand-lime products. Leduc states that a cinder of the following composition is used in England: SiO,. 40.60%: AU-O.t. 18.50%; FeA. 22.80%; CaO, 11.20%. This gives a sandlime product of the following composition, when 8J4% of lime is added: SiO-. 32.50% : AI-O.t* 14.80% Fe-CL, 18.20% ; CaO. 17.00% ; MgO. 5.5%: combined water, 12.00%.-- Rtjz\ dcs Maler. de Constr. ct dc Traz\ Pub. (1929 ) 242, pp. 419-422. The "Boehmite" of the Bauxites. Hocart and de {-apparent, in a recent paper de livered at the French Academy of the Sci ences meeting. rejxwt that one of them has indicated in certain bauxites the existence of microscopic crystals of a mono-hydrate of alumina (Al-O JIO), which he designated bochmiti', of nrthoromhic symmetry hut flit tering from diaspore in certain ones of its properties. Previously Rodim. in studying the radio grams. realized by the action of x-rays (Debye and Scherrer process) upon certain hydrates of alumina and on some bauxites, had shown that the existence of a mono hydrate of alumina can he deducted, which he designated bauxite homologous with the lepidocrocite (FejO.TT-O >, the diaspore be ing the other part homologous to the goethite. The identity of the IWhmite and the bauxite of Roehm apjieared infinitely proba ble. but it had not been clearly shown, until these investigators* findings. With some radiograms obtained by one of the authors ( Debye and Scherrer process 1 of the U'f'idoi rih if,' as well as the 1'iU'hmite, they have I con able to amass small crystals in sufficient numlicr (bauxite* of lYrcille. Ariege) showing a correspondence of lines which left no doubt as to the structural re lation of these two minerals. Moreover, the lines of the radiogram of the "boehmite" corresponded also to those that can be ob served in the radiogram of "bauxite" ob tained by Boehm. There can now remain no doubt as to the identity of the bauxite of Boehm and the Boehmitc, end as to the composition of the latter. The theories made by one of the authors on the diaspore of certain bauxites from the Fenouillct deposits, is confirmed by an ac curate radiogram of these bauxites, and shown to correspond to a radiogram of goethite. Thus, the homology of the boehmite and of the lepidocrocite on one hand, and the diaspore and the goethite on the other hand, is found to be clearly proven.--Cimcnl (1930) 35, 1, p. 8. Mineral Wool Production in France. Slag wool (laine de laitier) is a new French product being marketed tor use as insula tion under the name "Reforme." The molten slag, on discharging from the blast furnace, is pulverized by a jet of compressed air. It is then delivered to a refractory-lined vessel where it is kept in fusion by heat supplied from oil burners. The floor of this vessel is perforated to allow the slag to pass through in fine threads to a rotating cylin der. On this drum the threads are cooled by a spray of water so that the threads of fine diameter do not stick to each other while being wound around the drum. This insulating material resists tempera tures to 1500 deg. C, has a density of 0.22. is reasonable in price, has high insulating qualities and has a coefficient of conductibility of 0.05 to 0.06 for temperatures from 200 to 300 deg. C. It is supported on a metal frame and a galvanized grating for packing with a layer of cement to protect the out side.--Ciwcnf (1930) 35. 1. pp. 5-6. Magnesia Cements. The general com position and the conditions encountered in the use of magnesia cements are discussed in detail.--Ciuicut (1929 ) 34, 12. pp. 613-616. Recent Process Patents The foltoiting brief abstracts are of current process potenti issued by the U. 5. Patent Office, tTaskiagton, f). C. Complete copies may be obtained by sending }0e to the Superintendent of Documents, Government Printing Office, Washington, for each patent desired. Washing Sand and Gravel. The method uses two troughs or flumes, one above the other. The feed, as the discharge of a dredge pump, goes into the upper flume and clear water is pumped into the lower to he used as a second wash nr rinse. A series of open ings in the bottom of the upper flume allows the material to fall into the lower, hut these