64results about How to "Conducive to cost reduction and efficiency increase" patented technology

The invention discloses a fast and accurate detection method for silicon dioxide content in limestone, kalk and dolomite. The detection method comprises the following steps: crushing samples, and drying for 1.5-2.5 h under thea temperature of 105-110 DEG C; mixing 0.1000 g samples and 3.0-4.0 g mixed fluxing agent of sodium carbonate and boric acid evenly, liquating for 18-20 min under athe temperature of 890-910 DEG C, dissolving frits by a 45-55 ml hydrochloric acid and 25-35 ml water, and placing the test solution in a 250-ml volumetric flask; taking and adding 5.00 ml test solution in a 100-ml volumetric flask, adding 18-22 ml ammonium molybdate and still standing for 18-22 min, and adding 45-55 ml mixed acid of oxalic acid and sulfuric acid, 4.80-5.20 ml ascorbic acid-ammonium ferrous sulfate mixed solution; measuring the absorbency of a color development solution at the wavelength of 680 nm through a spectrophotometer, and using blank as a reference; preparing a silicon dioxide standard sample with the concentration of 40 ug / ml, moving and taking 0.00 ml, 2.00 ml, 4.00ml, 6.00 ml, 8.00 ml and 10.00 ml silicon dioxide standard samples, and placing the standard samples in 100-ml volumetric flasks respectively, adding 5.00 ml blank test solution in the volumetric flasks respectively, after color-developing, measuring the absorbency at the same conditions, and then drawing a working curve. The silicon dioxide content in the samples is calculated according to the following formula (shown in the specification). The detection method is fast and efficient, excellent in accuracy, reproducibility and stability, and particularly suitable for detection of samples with silicon dioxide content equal to or higher than 4 %.

The invention discloses a technique for using calcium carbonate carbon spheres in LF (ladle furnace) steelmaking, which comprises the following steps: pulverizing limestone to the granularity of 1mm below, evenly mixing with graphitic carbon, and pressing with a dry powder sphere presser to obtain calcium carbonate carbon spheres, wherein when producing every 100kg of calcium carbonate carbon spheres, the addition amount of limestone is y (y=83(100beta-51) / (83beta-12gamma)), the addition amount of the graphitic carbon is 100-y, beta is the carbon content (%) in the graphite, and gamma is the calcium carbonate content (%) in the limestone; and when smelting aluminum killed steel in a converter, adding the calcium carbonate carbon spheres according to the principle of equal addition amount to the substituted traditional calcium carbide, and using according to the traditional steelmaking technique.