1,217,791. Magnesia-Chromia brick. DRESSER INDUSTRIES Inc. 1 May, 1969 [3 June, 1968], No. 22284/69. Heading C1J. A refractory brick comprises magnesite and chrome ore in a ratio between 90:10 and 60: 40, less than 0À08 wt. per cent B 2 O 3 and up to 10 wt. per cent of CaO + P 2 O 5 + SiO 2 + Na 2 O in a weight ratio of CaO: SiO 2 : P 2 O 5 falling within the area ABCDE of Fig. 3 so that a calcium sodium silicophosphate bond is formed on burning and the brick has a modulus of rupture at 2700‹ F. in excess of 500 p.s.i. Bricks are made from a batch of size-graded dead burned magnesite, - 14+65 Tyler mesh chrome ore, a sodium metaphosphate glass binder and, if necessary, lime-yielding material by tempering with water, pressing at 1200 p.s.i., drying at 250‹ F. and burning at 2800‹ F. Alternatively, a burned magnesite-chrome ore brick can be impregnated with a soluble sodium phosphate binder and burned. Suitable lime-yielding materials are calcium carbonate, ferrite, aluminate, or chromite and Type III Portland cement. The chrome ore can provide the brick with up to 8À5 wt. per cent Al 2 O 3 and 11À1% Fe 2 O 3 .
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机译：1,217,791。镁铬砖。 DRESSER INDUSTRIES Inc. 1969年5月1日[1968年6月3日]，编号22284/69。标题C1J。一种耐火砖，其中菱镁矿和铬矿的比例为90:10至60:40，小于0‑08 wt。 B 2 O 3含量不超过10 wt％。在图3的ABCDE区域内，CaO：SiO 2：P 2 O 5的重量比为CaO + P 2 O 5 + SiO 2 + Na 2 O的百分比，从而在燃烧时形成硅磷酸钙钙键砖在2700英尺华氏度下的破裂模量超过500磅/平方英寸砖是由一批大小分级的死烧菱镁矿，-14 + 65泰勒目铬矿，一种偏磷酸钠玻璃粘合剂以及（如有必要）用水回火，在1200 psi下压制，在250℃干燥制成的生石灰材料制成的F.并在2800 ‹F燃烧。或者，可以用一种可溶的磷酸钠粘合剂浸渍已烧过的菱镁铬矿砖，然后进行烧制。合适的生石灰材料是碳酸钙，铁素体，铝酸盐或亚铬酸盐和III型波特兰水泥。铬矿石可为砖块提供高达8-5 wt。分别为Al 2 O 3和11‑1％Fe 2 O 3。
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