Is coal cinder alkaline or neutral? A detailed explanation of the pH of coal cinder

Everything must proceed from objective reality, and specific situations must be analyzed concretely. As is well known, the main component of pure coal is the element carbon. Coal is always mixed with rock fragments or soil impurities. In some regions, the coal contains substances with phosphorus and potassium minerals, so the coal cinder will inevitably contain phosphorus and potassium components. The region where the author is located, Longyan, is a coal-producing area. The coal produced in Longyan is mainly mixed with substances containing iron, sulfur, and calcium carbonate gangue minerals. After burning, the calcium carbonate gangue turns into lime, so the coal cinder contains lime components. Lime is an alkaline substance, so coal cinder naturally shows an alkaline reaction. Our country has a vast territory, and the components contained in coal produced in different places differ, so the chemical composition and chemical properties of coal cinder are not all the same. Everything in the world contains contradictions, and contradiction has both universality and particularity. To analyze, study, and resolve contradictions, one must firmly uphold the viewpoint of analyzing specific problems concretely. Exactly which carcinogenic substances coal cinder contains, whether the components contained in coal cinder produced in different places are the same, and whether there is sterile, non-toxic, clean coal cinder - researching and analyzing these questions must also be based on concrete analysis according to differences in coal production areas and differences in contained components, and one must not take a single instance as representative of the whole or make sweeping generalizations. (Zhang Bingfu)