A microscopic and quantitative analysis on the separation of chloride ion by fly ash washing: Effect of liquid-to-solid ratio, washing time and temperature

Study on dechlorination salt characteristics of pickling sludge by a water-washing process

“…These chlorine salts have high solubility in water and can be dissolved in a short time (10 min). 26 This is consistent with the time required for water washing to remove soluble chlorides from MSWI fly ash studied by Chen. 25 Because after a certain period of time, the dissolution of chlorine salt reaches a relatively balanced state, so it will no longer dissolve.…”

“…The influence of L/S ratio on the amount of soluble chlorine salt can be divided into the following situations: when the L/S ratio is very small, due to the strong water absorption of SHPS, only part of the soluble chlorine salt (NaCl, KCl, CaCl 2 , CaClOH) is diffused and dissolved into the solution, at this time, the whole dissolution system is in a supersaturated state; with the increase of L/S ratio, the amount of soluble chloride in SHPS increased until some components reached saturation; 26 continue to increase the L/S ratio, and the soluble chloride will continue to dissolve until it is almost completely dissolved; further increase the L/S ratio, since most of the soluble chlorine salts have been dissolved, the dissolved amount of chlorine salts has little change.…”

Research on the Optimization and Application of the Washing Dechlorination Process for Municipal Solid Waste Incineration Fly Ash

“…Insoluble chlorine is difficult to be removed by simple washing, and fly ash washing dechlorination is mainly for soluble chlorine removal . The main process parameters of fly ash washing dechlorination, such as the number of leaching, leaching time, liquid–solid ratio, and water temperature, have different influences on the dechlorination effect of fly ash. − The research of Wang shows that when the washing liquid–solid ratio is 10 mL/g, the washing time is 28 min, the water temperature is 30 °C, and the stirring speed is 450 rpm, the removal of chlorine element in fly ash reaches 93.3% through two cycles of washing . The high solid–liquid ratio is beneficial for fly ash washing dechlorination, but it also increases the load on the subsequent wastewater treatment.…”