Method for producing potassium sulphate fertilizer magnesium metal PVC and liquid chlorine hydrochloric acid through carnallite

Abstract

The invention discloses a method for producing potassium sulphate fertilizer magnesium metal PVC and liquid chlorine hydrochloric acid through carnallite. According to the technical route, firstly, the carnallite is dissolved with water and then is crystallized, potassium chloride and magnesium chloride hexahydrate contained in the carnallite are separated and purified; then, the magnesium chloride hexahydrate is electrolyzed through the improved Norsk Hydro process to prepare magnesium metal and chlorine; thirdly, a potassium chloride solution and concentrated sulfuric acid are subjected to a chemical reaction under a heated condition to prepare potassium sulfate fertilizer and hydrogen chloride; finally, secondary products including chloride and hydrogen chloride are used for producing liquid chlorine PVC or hydrochloric acid; the sylvite production raw material carnallite can be comprehensively utilized fully. A method for producing sulfuric acid sodium carbonate through natural sulfate (magnesium sulfate and mirabilite) in sylvite residues, a solvay process for producing sodium carbonate and a calcium carbide method for producing PVC are commonly applied, a plant is reasonably planned and established beside a salt lake, scientific cooperative production is achieved, resources can be comprehensively and circularly utilized, energy is saved, emission is reduced, consumption is reduced, and the environment protection is achieved.

Description

technical field [0001] The invention relates to the fields of chemical industry and metallurgy, specifically the field of organic chemical industry (polyvinyl chloride), the field of inorganic chemical industry (sulfuric acid, hydrochloric acid) and the field of light metal smelting (metal magnesium). Background technique [0002] At present, my country's production of chlorine-free potassium sulfate fertilizer (also known as potassium salt or potash fertilizer) is to use salt lake brine (such as Qinghai Salt Lake Potassium Fertilizer, Xinjiang Xinyatai Chemical Industry) or brine under the dry salt lake (such as Guotou Luo Potassium) to dry in salt fields. The production raw material carnallite (ingredients are potassium chloride, magnesium chloride hexahydrate, chemical formula KclMgcl26H2O) is obtained first, and then reacted with Glauber's salt to produce potassium sulfate fertilizer. Every ton of potassium sulfate fertilizer produced (accurately speaking: every ton of po...

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Problems solved by technology

[0003] 1. I have studied and solved the problem of comprehensive utilization of carnallite, the raw material for potassium salt production, and invented the method of dissolving carnallite with water and recrystallizing it to separate and purify the contained potassium chloride and magnesium chloride hexahydrate, and then separate them Piece use cases to exploit exhausted technical routes respectively

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