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    15.
    发明专利
    未知

    公开(公告)号：DE1471226A1

    公开(公告)日：1969-03-13

    申请号：DE1471226

    申请日：1964-01-17

    Applicant: HARBISON WALKER REFRACTORIES

    Inventor： DAVIES BEN

    IPC: C04B33/02 ,  C04B35/01 ,  C04B35/12 ,  C04B35/42 ,  C04B35/44

    Abstract: A non-plastic refractory composition is size graded so that 25-50% is - 28 mesh (Tyler) with the balance being - 4 + 28 mesh, from 50-95% of the - 28 mesh fraction being - 325 mesh, the - 325 mesh fraction comprising 13-30% of the composition, the average particle diameter of the - 65 mesh fraction being less than 9 microns. Refractory materials specified are dead burned magnesia, crude or calcined chrome ore, crude or calcined olivine, zircon, crude or calcined kyanite, dense alumina, calcined diaspore, calcined bauxite, dense zirconia, refractory quartzite or mixtures thereof. Up to 2% of - 325 mesh titania may be included. Refractory bodies may be prepared by forming self-sustaining shapes in an impact press and firing at at least 2900 DEG F. Tempering agents, e.g. water plus dextrin, chromic acid, epsom salts, lignin, carboxy-methylcellulose, alginates, starches and gums may be employed.

    Basic refractories
    18.
    发明专利
    Basic refractories 未知

    公开(公告)号：GB1077967A

    公开(公告)日：1967-08-02

    申请号：GB4257765

    申请日：1965-10-07

    Applicant: HARBISON WALKER REFRACTORIES

    Inventor： DAVIES BEN ,  HAVRANEK PETER HARRY

    Abstract: 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.

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