Bottom ash is the main solid residue from municipal solid waste incineration (MSWI). The material can be utilised in the construction industry but high requirements for this option are often not met by material generated during ordinary bottom ash treatment. Hence, the objective of the present study is to investigate the suitability of density separation for bottom ash to generate mineral material fractions with different properties. MSWI bottom ash samples were sieved to a size of 2–4 mm and 4–8 mm, respectively, washed and dried before being fed to a density separation processes. Thereby, the density fractions < 1000 kg/m³, 1000–1700 kg/m³, 1700–2400 kg/m³, 2400–3000 kg/m³ and > 3000 kg/m³ were generated and, subsequently, sorted into mineral material, glass, metals and unburnt organic matter. Mineral material with a density above 2400 kg/m³ and even more above 3000 kg/m³ shows a very high content of Fe, Cu and Zn of up to 448,000 mg/kg, 61,000 mg/kg and 44,000 mg/kg, respectively. Hence, the high density fraction of mineral material could be used as a raw material for metal production. Glass with a density above 2400 kg/m³ has a Pb content of up to 87,000 mg/kg, while the Pb content of lower density glass is decreased.

底灰是城市生活垃圾焚烧（MSWI）的主要固体残留物。该材料可用于建筑行业，但是普通底灰处理过程中生成的材料通常无法满足该选项的高要求。因此，本研究的目的是研究密度分离适用于底灰以产生具有不同性质的矿物材料级分的适用性。将MSWI底灰样品分别筛分至2–4 mm和4–8 mm的大小，洗涤并干燥后再进行密度分离。从而，密度级分<1000千克/米³，1000至1700年千克/米³，1700年至2400年千克/米³，2400-3000千克/米³和>3000公斤/米³产生，然后分为矿物材料，玻璃，金属和未燃烧的有机物。矿物材料与上述公斤米2400 /密度³和甚至更在3000千克/米³毫克，分别示出了Fe，Cu和向上的锌的含量非常高到448000 /千克61000毫克/千克和44000毫克/千克， 。因此，高密度的矿物材料可用作金属生产的原料。密度高于2400 kg / m ^3的玻璃的Pb含量高达87,000 mg / kg，而低密度玻璃的Pb含量降低。