含钾硅酸盐肥料在盐酸与柠檬酸中的溶解行为

为研究高温煅烧法制备的含钾硅酸盐肥料在酸性条件下的溶解行为,选择盐酸与柠檬酸作为浸提液,在室温下研究营养元素溶出与矿物组成的变化,探讨硅酸盐肥料包含矿物遇酸发生的化学反应。结果表明:浸提液pH值越低,元素溶出越多;p H值为2.1的柠檬酸的溶解作用强于pH值为2.1的盐酸。pH值为0.3的盐酸对硅酸盐肥料矿物的溶解率最高,滤渣中仅检测到了白榴石的衍射峰。钾霞石和钙铝黄长石两种矿物遇酸反应后生成的高岭石、三水铝石进一步遇酸反应是铝溶出的直接原因。

Dissolution Behaviors of K-containing Silicate Fertilizer in Hydrochloric and Citric Acids

To clarify the dissolution behavior of K-containing silicate fertilizers produced by high-temperature sintering under acidic condition,the chemical element release and mineral evolution were investigated at ambient temperature in the extractants of hydrochloric and citric acids based on the chemical reactions of minerals contained in silicate fertilizer with acids.The results show that the more elements are released at a lower p H value of extractant.2%citric acid with pH 2.1 is significantly more effective in dissolving the silicate fertilizer than hydrochloric acid with the same pH value.The dissolution rate of silicate fertilizer in hydrochloric acid at pH value of 0.3 is maximum,and only a mineral detected in the filter residue is leucite.Kaolinite and gibbsite are formed in the reactions of kalsilite and gehlenite with acid.Aluminum release is due to the further reactions of kaolinite and gibbsite with acid.