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.

The invention discloses a repairing process for a heating coil of a steel claw straightening machine for aluminum electrolysis. The process comprises the steps that (1) the heating coil is dismounted; (2) the heating coil is repaired; (3) a mold is manufactured; (4) a coil foundation is manufactured; (5) the middle of the heating coil is constructed; (6) the interior of the heating coil is constructed; and (7) the constructed heating coil is installed after being maintained at the room temperature to be dried, after the coil is heated and dried, pig iron is taken out, and equipment can be put on production when the coil has no abnormal condition. The repairing process has the beneficial effects that the consumed time is short, the total cost is low, and cost decreasing and benefit increasing are facilitated for enterprises. By the adoption of the made-to-order mold manufactured according to the contraction ratio of steel claws, damage to the coil from the deformed steel claws is prevented.

The invention belongs to the field of building materials, and in particular relates to a high-bending composite Portland cement and a preparation method thereof. The high-bending composite Portland cement is made of the following raw materials in parts by weight: 35-65 parts of Portland cement Clinker, 17.5‑40 parts calcined clay, 10‑22.5 parts limestone, 1.5‑5 parts gypsum. The invention provides a concrete core raw material starting from cement itself, on the basis of ensuring high cement compressive strength, the folding ratio is increased, the cement flexural strength is improved, and ordinary Portland cement clinker, calcined A high-bending composite Portland cement prepared with clay and low-grade limestone as main raw materials and a preparation method with the characteristics of simple process and suitable for industrial production.

The invention discloses a lithium ion battery core drying method. The lithium ion battery core drying method comprises the following steps of: (1) putting a lithium ion battery core in a closed system, and carrying out vacuum pumping, wherein the time taken is recorded as h; (2) heating, inflating and blasting the system simultaneously; carrying out heat preservation and pressure maintaining after reaching the setting temperature and vacuum degree; and continuously blasting in the whole process, wherein the time taken is recorded as h1, and a medium used for inflation and blasting is a non-oxide gas; and (3) maintaining the temperature of the system to be 90-110 DEG C, carrying out vacuum pumping till the vacuum degree is below 100Pa, and carrying out pressure maintaining, wherein the time taken in the whole process is recorded as h2, and h, h1 and h2 meet conditions shown in the (I). The lithium ion battery core drying method is simple in technology, improves drying efficiency, reduces the time taken for drying and the deformation of a battery core diaphragm in a drying process, facilitates realization of cost reduction, benefit increasing and product quality improvement for battery production enterprises and is suitable for large-scale popularization and application.