Preparation of Sintered Brick with Aluminum Dross and Optimization of Process Parameters

Abstract

Aluminum dross is produced in the process of industrial production and regeneration of aluminum. Currently, the main way to deal with aluminum dross is stacking and landfilling, which aggravates environmental pollution and resource waste. In order to find a green and environmental protection method for the comprehensive utilization, the aluminum dross was used as raw materials to prepare sintered brick. Firstly, the raw material ratio, molding pressure and sintering process were determined by single factor test and orthogonal test, and the mechanism of obvious change of mechanical strength of sintered brick was studied by XRD and SEM. The experimental results show that, the optimal formula of sintered brick is 50% aluminum dross, 37.50% engineering soil and 12.50% coal gangue. The optimum process parameters are molding pressure 10 MPa, heating rate 8 °C/ min, sintering temperature 800 °C, holding time 60 min. The samples prepared under the above formula and process parameters present outstanding performance, and the compressive strength, flexural strength and water absorption rate are 16.21 MPa, 3.42 MPa and 17.12% respectively.

Effects of Hydrolysis Parameters on AlN Content in Aluminum Dross and Multivariate Nonlinear Regression Analysis

“…During this process, the N in AlN was separated from the aluminum dross in the form of NH 3 , and its elemental position was occupied by OH − ions to form Al(OH) 3 with a molecular mass of 78, which was considerably greater than the original AlN's 41. Additionally, apart from insoluble substances such as Al and Al 2 O 3 , the aluminum dross also contained small amounts of soluble salts, such as NaCl and KCl [22,23].…”

Formulation of Non-Fired Bricks Made from Secondary Aluminum Ash

“…Adeosun et al [8] prepared insulating refractory bricks by incorporating aluminum ash into plastic clay and kaolin, which could withstand up to 1200 • C. Murayama et al [9] prepared Mg-Zn, Ca-Al and Zn-Al hydrotalcites by dissolving aluminum ash (raw material) in HCl and NaOH solvents, which could serve as steelmaking deoxidizers. Zhang et al [10] prepared sintered bricks with aluminum ash as raw materials, and obtained the best formula as follows: aluminum ash 50%, engineering soil 37.50%, coal gangue 12.50%, and the compressive strength of the sintered brick can reach 16.21 MPa. Ni and Zhang [11,12] prepared aluminum ash coating by plasma spraying.…”