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    • 53. 发明专利
    • Metal encased refractory
    • GB1101869A
    • 1968-01-31
    • GB3769466
    • 1966-08-28
    • HARBISON WALKER REFRACTORIES
    • F27D1/08
    • 1,101,869. Metal-encased refractory bricks. HARRISON - WALKER REFRACTORIES CO. 23 Aug., 1966 [8 Sept., 1965], No. 37694/66. Heading F4B. A composite metal-encased basic refractory block 10 comprises two overlapping preformed metal sheets, namely an inner case section 11 and an outer case section 12 spot-welded together. The inner case section 11 is made from a sheet metal blank comprised of a relatively narrow web 15 having a relatively wide first arm 16 depending from one long edge and three short tabs 17 extending from the opposed edge. The arm 16 has an extending tab 18 apertured at 19 to form a hanger tab, the aperture 19 being pressed out of the arm 18 to form a finger 20 which is contiguous to the plane of the cold end of the brick. The outer case section 12 consists of metal thinner than that of 11 and is a generally U-shaped piece including a web from which extend two arms of equal width, the width being larger than the width of the web.
    • 57. 发明专利
    • Basic refractories
    • GB1077967A
    • 1967-08-02
    • GB4257765
    • 1965-10-07
    • HARBISON WALKER REFRACTORIES
    • DAVIES BENHAVRANEK PETER HARRY
    • A burned, ceramically-bonded magnesite basic refractory shape is made from synthetic magnesia grain comprising MgO, CaO, SiO2 and B2O3, the grain analysing (oxide basis) by weight, at: at least 90% MgO and not more than 5% CaO; a maximum B2O3 content of (a) 0.05% when the CaO to SiO2 ratio is less than 1.6 to 1 and the SiO2 content is over 1%, and of (b) (C + S)2/100, (where C = percentage CaO and S = percentage SiO2 in the grain), when the CaO to SiO2 ratio is from 1.6:1 to 4:1 at SiO2 contents above 1%, and when the CaO to SiO2 ratio is below 3:1 at SiO2 contents up to 1%, the balance being R2O3 materials (i.e. Fe, Al, Cr). A binder, e.g. waste sulphite liquor, up to 5% b.w. may be added to the grain, and the final shape may be impregnated with tar or pitch. Several specific examples are described, and excess boron may be eliminated during firing by incorporating an alkali metal compound in the batch, a volatile alkali metal borate being formed. Two examples illustrate the removal of boron. In one, the B2O3 content of a batch of commercial dead-burned magnisite comprising 96% MgO with CaO, SiO2, Al2O3 and Fe2O3, was reduced from 0.14 to 0.03%, using up to 1.0% Na2CO3 and firing at 3050 DEG F. In the other, a magnisite made according to Specification 926,148 had its boron content reduced from 0.12 to 0.012% using 1% of each of NaCl, NaF and Na2CO3.