Aluminium prices on Friday rose 0.35 per cent to Rs 241.50 per kilogram in futures trade as speculators built up fresh positions amid a positive trend in the spot market. On the Multi Commodity Exchange, aluminium contracts for October delivery increased 85 paise or 0.35 per cent to Rs 241.50 per kg in a business turnover of 3,212 lots. Analysts said fresh positions created by traders amid demand from consuming industries supported aluminium prices in the futures market.