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近年来,化学工艺流程试题中对金属及金属化合物的冶炼与提纯已成为中考命题热点并呈上升的趋势。这类试题实质就是用某些原料来制备金属及金属化合物的的过程,它可能会包含置换、除杂、过滤分离、提纯、电解等实验。解题思路是:先明确产品的性质,从题目中或所学知识中获取有用信息,然后根据实验目的,确定制备原理,寻找制备过程所需的原料;分析有没有副产品,最后的步骤就是分离提纯所要制备的物质。类型一金属冶炼为主题的工艺流程
In recent years, chemical process flow test of the metal and metal compounds smelting and purification has become a hot topic in the test and a rising trend. The essence of these questions is to use some of the raw materials for the preparation of metal and metal compounds in the process, it may include replacement, impurity removal, filtration and separation, purification, electrolysis and other experiments. Problem-solving ideas are: first clear the nature of the product, from the title or learned knowledge to obtain useful information, and then according to the purpose of the experiment, to determine the preparation principle, looking for the preparation process of raw materials; analysis of the by-products, the final step is to separate Purification of the material to be prepared. Type-one metal smelting as the theme of the process