Method for preparing alpha high-strength gypsum through atmospheric pressure salt solution method by using chlor-alkali by-product salt gypsum and chemical waste salt

The invention discloses a method for preparing alpha high-strength gypsum through an atmospheric pressure salt solution method by using a chlor-alkali by-product salt gypsum and a chemical waste salt.First, the chemical waste salt is dried to remove free water and part of crystallization water, and then sent to a high-temperature incineration apparatus for incineration or high-temperature cracking to remove organic harmful substances, and then the incinerated or high-temperature cracked chemical waste salt is mixed with distilled water in a conical flask to prepare a salt solution; then the chlor-alkali by-product salt gypsum powder and a crystal conversion agent is added into the salt solution, and a water bath reaction is carried out after stirring; and after the water bath reaction iscompleted, solid-liquid separation is performed quickly by a centrifuge and washing is performed with boiling water for several times, then absolute ethanol is added for washing to stop the reaction,then drying is performed in