热脱水钠硼解石在醋酸铵溶液中的溶解(英文)

Dissolution of thermally dehydrated ulexite in ammonium acetate solutions

钠硼解石含有大量的结晶水。采用煅烧法可以将固体组分中的一部水脱去,得到一种多孔结构物质,以提高浸出反应速率。采用醋酸铵作为浸出溶剂,研究煅烧钠硼解石样品在不同温度下的溶解情况。研究了反应参数对煅烧钠硼解石溶解的影响。研究发现,煅烧样品的溶解速率高于未煅烧样品的溶解速率。在煅烧温度低于150℃时,煅烧钠硼解石的溶解速率随着煅烧温度的升高而加快。钠硼解石的浸出反应速率符合化学反应控制模型。溶解过程中的活化能为41.5kJ/mol。

Ulexite,a boron mineral,contains a substantial amount of hydration water.Using calcination method,some part of water in the composition of solid can be removed from the solid matrix,and a porous structure can be obtained to increase the reaction rate.The dissolution of the calcined ulexite samples at various temperatures was investigated.Ammonium acetate was used as a leach reagent.The effects of some reaction parameters on the dissolution of the calcined ulexite were examined.It is found that the dissolution rate of calcined samples is higher than that of the uncalcined sample.The dissolution rate of the calcined ulexite is enhanced with increasing calcination temperature up to 150 ℃.It is determined that the reaction rate conforms to the chemical reaction model.The activation energy of the dissolution process was calculated to be 41.5 kJ/mol.