Sulfuric acid refining preprocessing method of life refuse burning flying ash
A technology for incineration and pretreatment of domestic waste, applied in the field of environmental engineering, can solve problems such as hindering cement hydration and clogging of cement kilns, achieve the effects of harmless landfill resource utilization, and reduce leaching toxicity
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[0012] Example 1
[0013] Under normal temperature and pressure conditions, add 100 g of household waste incineration fly ash dried at 105°C for 24 hours into a beaker, add 1000 mL of nitric acid solution with a concentration of 0.5% by mass, start a stirrer, and mix the two thoroughly. Stir for 20 to 60 minutes, and let stand for 10 to 20 minutes to separate the upper acid solution from the fly ash, analyze the concentration of heavy metals in the acid solution, and analyze the residual chlorine content in the fly ash. The fly ash is pickled with 1%, 2%, 3%, 4%, and 5% by mass percentage of nitric acid, respectively, and the above operation steps are repeated. The experimental results are shown in Tables 1 and 2.
[0014] Table 1 Effect of nitric acid pickling fly ash
[0015]
[0016] Table 2 Heavy metal concentration in nitric acid solution after pretreatment of fly ash (mg / L)
[0017]
Example Embodiment
[0018] Example 2
[0019] Under normal temperature and pressure conditions, add 100 g of household waste incineration fly ash dried at 105°C for 24 hours into a beaker, add 1000 mL of sulfuric acid solution with a concentration of 0.5% by mass, start a stirrer, and mix the two thoroughly. Stir for 20 to 60 minutes, and let stand for 10 to 20 minutes to separate the upper acid solution from the fly ash, analyze the concentration of heavy metals in the acid solution, and analyze the residual chlorine content in the fly ash. The fly ash is pretreated by pickling with sulfuric acid with a mass percentage concentration of 1%, 2%, 3%, 4%, and 5%, respectively, and repeat the above operation steps. The experimental results are shown in Tables 3 and 4.
[0020] Table 3 Sulfuric acid pickling fly ash effect
[0021]
[0022] Table 4 Concentration of heavy metals in sulfuric acid solution after pretreatment of fly ash (mg / L)
[0023]
Example Embodiment
[0024] Example 3
[0025] Under normal temperature and pressure conditions, add 100 g of household waste incineration fly ash dried at 105°C for 24 hours into a beaker, add 1000 mL of acetic acid solution with a concentration of 0.5% by mass, start a stirrer, and mix the two thoroughly. Stir for 20 to 60 minutes, and let stand for 10 to 20 minutes to separate the upper acid solution from the fly ash, analyze the concentration of heavy metals in the acid solution, and analyze the residual chlorine content in the fly ash. The fly ash is pickled and pretreated with acetic acid with a mass percentage concentration of 1%, 2%, 3%, 4%, and 5% respectively, and the above operation steps are repeated. The experimental results are shown in Tables 5 and 6. The test results of citric acid and phosphoric acid pickling fly ash are shown in Tables 7, 8, 9, 10.
[0026] Table 5 Effect of acetic acid pickling fly ash
[0027]
[0028] Table 6 Concentration of heavy metals i...
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