The invention provides a method for cooperative activation of
fly ash and
decomposition of
gypsum for
recovery of a
sulfur resource. According to the method,
solid waste, i.e.,
fly ash, discharged by a
coal-fired power
plant or
coal-fired boiler is used as a
raw material, a certain proportion of desulfurized
gypsum discharged by the
coal-fired power
plant or waste
phosphogypsum produced in the
phosphorus chemical industry is added and mixed with the
fly ash, then the obtained mixture is subjected to ball milling, and activation and
calcination at a temperature of 950 to 1450 DEG C are carried out for 5 to 180 min;
calcium sulfate in the
gypsum are almost totally decomposed after
calcination, and produced gas contains
sulfur dioxide or
sulfur trioxide which can be used as feed gas for preparation of
sulfuric acid; and
calcination enables
solid fly ash to be activated, leaching with a
sulfuric acid or
hydrochloric acid solution is carried out at a temperature of 50 to 100 DEG C, and the
leaching rate of
alumina is greater than 80%. The method provided by the invention has the advantages that since all the raw materials are
solid waste, the purpose of treating the waste by using the waste is achieved; elemental sulphur in the gypsum can be recovered; and the fly ash can be activated and activity of the fly ash can be improved, so a high
alumina recovery rate at a low temperature can be realized. With the method, high-efficiency extraction of
alumina in the fly ash is realized; the sulfur resource in the gypsum is recovered; shortage in industrial sulphur in the
sulfuric acid industry in China is compensated; and the method has good
economic benefits and wide industrial application prospects.