![]() Therefore, this technology may bring both environmental and economic benefits.įly ash recovery soluble salts washing process. The ethanol can be recycled by distillation and reused as the solvent. ![]() During the ethanol-adding precipitation process, each salt was separated individually, and the purity of the raw production in laboratory experiments reached about 90%. Finally, ethanol was added into solutions A and B to change the solubility of sodium, potassium, and calcium chlorides within the mixed solvent of water and ethanol. ![]() Chromium (II) chloride has no commercial uses but is used on a laboratory-scale for the synthesis of other chromium complexes. In the given case, the temperature of the water is decreasing during the reaction. And then, the solid mixture was fully dissolved into water (solution B obtained). The anhydrous solid is white when pure, however commercial samples are often grey or green it is hygroscopic and readily dissolves in water to give bright blue air-sensitive solutions of the tetrahydrate Cr (H 2 O) 4 Cl 2. Endo means inside and Exo means outside and thermic refers to heat. The two types of reaction that are opposite to each other are endothermic and exothermic reaction. The combined ionic bond strength of CrCl and intermolecular forces between water molecules. Hence heat of the solution is endothermic. This suggests that during the reaction, the temperature is absorbed from the surroundings. First, in the three-step evaporation-crystallization process, pure sodium chloride and solid mixture of sodium and potassium chlorides were obtained separately, and the remaining solution contained potassium and calcium chlorides (solution A). When the temperature of water decreases by dissolving crcl2, the reaction is endothermic reaction. In the given case, the temperature of the water is decreasing during the reaction. In laboratory experiments, a simulating hydrosaline solution was prepared according to composition of the waste washing water. This paper explored an effective and practical recovery method to separate sodium chloride, potassium chloride, and calcium chloride salts individually from the hydrosaline water. However, these salts can be recycled as resources instead of discharge. As it happens, the enthalpy of solution of NaCl N a C l in water (that is, the energy change associated with the dissolution of sodium chloride crystals in water) at standard conditions is very slightly positive, i.e., it is an endothermic process. The wastewater generated during the washing process is a kind of hydrosaline solution, usually containing high concentrations of alkali chlorides and sulphates, which cause serious pollution to environment. Water washing is widely used as the pretreatment method to treat municipal solid waste incineration fly ash, which facilitates the further solidification/stabilization treatment or resource recovery of the fly ash.
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