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51results about How to "Low content of harmful impurities" patented technology

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Pre-heating decomposition method of producing sulfuric acid from phosphogypsum with co-production of cement

ActiveCN105129744AImprove decomposition efficiencyIncrease concentrationSulfur compoundsClinker productionDecompositionPhosphogypsum

The invention relates to the technical field of industrial production of sulfuric acid and cement, the field of industrial solid waste comprehensive utilization, and the field of environment protection and treatment, and particularly relates to a pre-heating decomposition method of producing sulfuric acid from phosphogypsum with co-production of cement. The method includes the steps of powder grinding of raw materials, multi-stage cyclic pre-heating, high-effective decomposition and kiln gas separation and purification. The method is used for preparing a cement raw material from the phosphogypsum subjected to pre-heating decomposition with clay, sand rock, coke and such auxiliary materials in the process of producing the sulfuric acid from the phosphogypsum with co-production of the cement. The method solves the problems that a pre-heating decomposition technology in the prior art is low in decomposition ratio of phosphogypsum, is low in productivity of sulfuric acid and clinker, is liable to cause crusting and blocking in a kiln and is high in production energy consumption, can reduce the decomposition efficiency of the phosphogypsum and accelerate escape of SO2, and further increase the productivity of the sulfuric acid and cement clinker. The pre-heating decomposition method of producing the sulfuric acid from the phosphogypsum with co-production of the cement can significantly reduce sintering temperature and energy consumption of the clinker, can reduce production cost of sulfuric and cement clinker, and can further increase comprehensive utilization rate of the phosphogypsum.

Owner:湖北湖大天沭新能源材料工业研究设计院有限公司

Preparation process for high-strength high-conductivity micro copper wire

ActiveCN106269970AIncrease surface tensionLow content of harmful impuritiesElectrolysisCopper wire

The invention discloses a preparation process for a high-strength high-conductivity micro copper wire. The preparation process comprises the following steps: S1, adding electrolytic copper into a smelting furnace, preserving heat and melting the electrolytic copper completely to obtain molten copper, introducing an inert gas, adding a composite refining agent, standing and slagging; S2, detecting that the molten copper comprises the following components in percentage by weight: 0.45 to 0.55 percent of Ti, 0.25 to 0.35 percent of Zr, 0.07 to 0.09 percent of Te, 0.07 to 0.09 percent of La, 0.03 to 0.05 percent of Y, 0.15 to 0.25 percent of Sn, less than or equal to 0.05 percent of Mg, and the balance of Cu; S3, enabling a crystallizer of a continuous casting machine to extend into the molten copper, and drawing upwards through a drawing roller mechanism to form an oxygen-free copper rod; S4, extruding the oxygen-free copper rod continuously and drawing repeatedly to obtain the high-strength high-conductivity micro copper wire. According to the copper wire which is prepared by the preparation process, the electric conductivity reaches over 95 percent IACS, and moreover, the tensile strength is also over 480 MPa.

Owner:安徽晋源铜业有限公司

High-carbon chromium bearing steel for railway truck bearing and preparation method

InactiveCN107747034ALow content of harmful impuritiesReduce in quantityTruckChromium

The invention relates to high-carbon chromium bearing steel for a railway truck bearing. The high-carbon chromium bearing steel for the railway truck bearing is characterized in that product elementsC, Si, Mn, Cr and Al have the same requirements on technical conditions with vacuum degassed high-carbon chromium bearing steel for a traditional railway truck bearing. Hairlines longer than 0.6 mm donot exist through detection by a tower shape method; a metallographical method is adopted to detect that the B fine system of microcosmic brittle inclusions is not more than 1.5 grade, the B thick system is not more than 0.5 grade, the D fine system is not more than 0.5 grade, the D thick system is not more than 0.5 grade and the DS system is not more than 1.0 grade; the metallographical method is adopted to detect without allowing existence of microcosmic holes; the center porosity of a macrostructure is not more than 1.0 grade; the general porosity is not more than 1.0 grade; the ingot segregation is not more than 1.0 grade; and the metallographical method is adopted to detect that the carbide liquation is not more than 0 grade, the carbide strip shape is not more than 2.0 grade and thecarbide net shape is not more than 2.5 grade. The high-carbon chromium bearing steel belongs to excellent bearing steel with high purity, high structure uniformity and high compactness.

51results about How to "Low content of harmful impurities" patented technology

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