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[Chemical Knowledge]：What are the upstream raw materials for inorganic salts? What do the downstream products contain?

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In the field of chemical production raw materials, inorganic salts are a kind of important compounds, which are widely used in various industrial production processes. There are many upstream and downstream related products of inorganic salts, and some of the main upstream and downstream products will be described in detail below.

Upstream Products

1. Ores and Minerals: Many inorganic salts are extracted from natural ores and minerals. For example, pyrite (FeS2) is the main raw material for the production of sulfuric acid (H2SO4), which is an important raw material in the production of inorganic salts.
2. Chemical reagents: In the process of producing inorganic salts, it is often necessary to use various chemical reagents as reactants or catalysts. For example, sodium hydroxide (NaOH) and hydrochloric acid (HCl) are commonly used to adjust the pH of a solution to facilitate chemical reactions.

Downstream Products

1. Chemical Products: Inorganic salts can be used as raw materials to produce various chemical products, such as phosphate fertilizer, nitrogen fertilizer, chlor-alkali, etc. For example, phosphate is one of inorganic salts, which can be used as a water treatment agent, preservative, etc., and can also be used to produce phosphate fertilizer.
2. Food additives: Some inorganic salts can be used as food additives to improve food taste and extend shelf life. For example, table salt (NaCl) is a common food additive used to adjust the taste of food and improve preservation.
3. Pharmaceutical intermediates: Some inorganic salts can be used as pharmaceutical intermediates for the production of various drugs. For example, yellow blood salt (K4[Fe(CN)6]) may be used in the manufacture of a medicament for the treatment of anemia.

Generally speaking, the upstream and downstream related products of inorganic salts are very extensive, involving many fields, such as chemical industry, food, medicine and so on.

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