氧化铝主力合约日内涨幅扩大至6.00%，现报3120元/吨。

Core Viewpoint - The main contract for alumina has seen an intraday increase of 6.00%, currently priced at 3120 yuan per ton [1] Group 1 - The significant rise in alumina prices indicates strong market demand and potential investment opportunities in the alumina sector [1] - The current price level of 3120 yuan per ton reflects a notable shift in market dynamics, which could impact related industries such as aluminum production [1] - The 6.00% increase in the main contract suggests volatility in the commodity market, warranting close monitoring for investors [1]