Cement, raw material

Pyroprocessing, of Portland cement raw material, 5 488—489 Pyroredox process, 19 678 Pyrosulfuryl chloride, 23 641, 645, 647, 649 Pyrosultones, decomposition of, 23 527 Pyrotechnics... 

Portland cement raw materials contain small proportions of MgO as noted in Section 1.1.2, these must be limited to avoid formation of more than a minor amount of periclase. The iron in Portland cement clinkers is normally present almost entirely as Fe, but calcium aluminate cements may contain both Fe " and Fe . ... 

From experiments to grind cement clinker to —80 pm, as compression is increased from 100 to 300 MPa, the required recycle ratio decreases from 4 to 2.8. The energy required per ton of throughput increases from 2.5 to 3.5 kWh/ton. These data are for a 200-mm-diam-eter pilot-roll press. Status of 150 installations in the cement industry is reviewed [Strasser et al., Tiock Products, 92(5), 60-72 (1989)]. In cement clinker milling, wear is usually from 0.1 to 0.8 g/ton, and for cement raw materials it is between 0.2 and 1.2 g/ton, whereas it may be 20- to 40-in ball mills. 

Many researchers found that, for a given material, pan design, and inclination, optimization indicates only a very small opportunity to vary speed. Therefore, it can be considered as (adjustable) constant for given conditions. Figure 114 and equation (71) are directly valid for cement raw material but also can be used as a general approximation. 

Specifically, for the balling disc and cement raw material, Klatt " determined that optimum operating conditions are only found for a narrow band of parameters and concluded that the capacity C (in tons per hour) may be calculated from the pan diameter D (in meters) by... 

Gypsum is the largest resource of sulfur in the world. Most processes for recovering sulfur from gypsum yield sulfuric acid, with a cement raw material high in lime as a coproduct. The Bureau of Mines has done considerable research in the past. Imperial Chemical Industries (ICI), Ltd., of the United Kingdom had operated a commercial plant for several years, but present economics are... 

For the calibration of comparative methods and in particular WDXRF, but also for automatic analysers and other spectrometric methods, many natural materials have been developed for several years. This concerns mainly the analysis of ores, cements, raw materials, etc. These materials are certified on the basis of spectrometric methods and, as for some synthetic mixtures, the calibration will be affected by the uncertainty of the calibrant,... 

Self-Tuning Adaptive Control of Cement Raw Material Blending, by L. Keviczky, J. Hetthesy, M. Hilger, and J. Kolostori, Automatica, 14, 525 (1978). 

The dust from the furnaces is mainly formed by the cement raw material, particularly limestone. The weight concentration of the dust per volume of combustion products is typically 2-7 g m in the case of shaft furnaces,... 

Certain minerals in cement raw materials examined in thin sections or sieved powders can be selectively stained with a wide variety of liquids (Carver, 1971 Hutchison, 1974) and studied with a stereomicroscope and a petrographic microscope. The stains are normally used to augment data from ordinary optical microscopy. 

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