| 摘要 |
<p>The briquette is formed from a mixture containing, by weight, 85-98 % slag from secondary aluminium processing, 1 to 8 % polyvinyl acetate dispersion as the polymeric bonding agent and the remainder water; the briquette contains water in the form of residue humidity at a quantity of maximally 1.5 %, ideally no more than 0.5 %, in relation to the overall weight of the briquette, where the briquette has a specific weight of 1,500-5,000 kg.m-3 and a compression strength of at least 20MPa. Idealy, the mixture contains 90-92 % slag from secondary aluminium processing, 1 to 3 % polyvinyl acetate dispersion and the remainder water. The mixture may also contain 0.5-2 % unsaturated acid, selected from the group containing oleic acid and/or palmitic acid and/or stearic acid, as a hydrophobic ingredient. The ideal shape of the briquette is cylindrical. The briquette is obtained as follows: the various ingredients are mixed into a homogenous state for a period of 10-60 seconds in the mixer; the homogenous mixture thus obtained is pressed, at a specific press power of 110 to 1130 MPa, into briquette shape; the briquettes are subsequently dried at a temperature between 120 and 200° C for a period of 30-60 minutes, depending on the weight of the briquette, until the amount of residue water is reduced to a maximum value of 1.5 % by weight. After drying, the hot briquette is cooled, ideally to a temperature between 30 and 50 °C. The cooled briquette is wrapped up for protection against humidification until further use or processing. In the mixing of the components into a homogenous state in the mixer, the mixture is also ideally pre-heated to a temperature between 25 and 99° C.</p> |
