| 摘要 |
<p>The invention relates to the production of industrial ceramics and fire-resistant materials and can be used in the preparation of lightweight fire-resistant articles intended for use at temperatures of up to 1700 °C. The proposed charge for obtaining cordierite comprises the following components: 0.1-5.8 wt.% magnesium oxide, 0.3-14.8 % alumina, 49.4-53.4 % silica and 28.0-50.2 % alumino-magnesia spinel. The latter is obtained by one of two proposed methods from 'fresh' saline or leached slags produced during the production of aluminium alloys. In one of the methods, alumino-magnesia spinel is obtained by roasting crushed slag containing 16-30 wt.% aluminium oxide, 2-15 % magnesium oxide, 30-70 % sodium and potassium chlorides, 2-15 % aluminium, 0.1-10 % silicon oxide, 2-8 % other additives; the roasting process involves heating the charge to 1450-1550 °C at a rate of 100-300 °C per hour and keeping it at the maximum temperature for between one and six hours. The second method involves the use of a leached slag comprising 20-50 wt.% alumium oxide, 3-20 % magnesium oxide, 5-25 % aluminium, 0.2-15 % silicon oxide and 5-20 % other additives. The slag is mixed with carbon powder (3-15 % by weight of the total mixture) and heated to 900-1200 °C until the initial mixture ignites. To increase the yield of alumino-magnesia spinel, the product can be subjected to further roasting at a temperature of 1400-1500 °C.</p> |
