商品日报（5月19日）：氧化铝大涨超6% 双焦、碳酸锂等连创新低

Group 1 - The core point of the news is the significant price movements in various commodities, particularly the sharp increase in alumina prices due to supply disruptions, while other commodities like lithium carbonate and焦煤 experienced declines [1][2]. - Alumina contracts hit the limit up with a 6.25% increase, driven by supply concerns after Guinea's mining authority ordered a halt at the Axis mine, affecting an annual capacity of approximately 40 million tons [2]. - The overall commodity futures price index showed a slight decline, with the China Commodity Futures Price Index closing at 1355.25 points, down 0.28% from the previous trading day [1]. Group 2 - The supply issues in alumina are expected to provide short-term support for prices, but the long-term outlook remains uncertain due to potential oversupply as production may recover with rising prices [2]. - The double焦 and lithium carbonate prices have reached new lows, with lithium facing a downward spiral due to weak downstream demand [4]. - The egg futures market has seen a decline, with expectations of weak prices continuing due to increasing supply pressures and seasonal demand fluctuations [4].