Method for extracting high purity alumina and silica gel from coal ash
A technology of fly ash and alumina, applied in the directions of silica, silica, alumina/aluminum hydroxide, etc., can solve the problems of insignificant economic benefits, and achieve breakthroughs in high cost, cost reduction and simple process. Effect
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Embodiment 1
[0074] 1. Take fly ash and Na 2 CO 3 After mixing and stirring at a ratio of 1:0.8, the mixture was roasted at a temperature of 700° C. for 20 minutes to obtain a roasted product. During calcination, the calcination equipment is connected to the gas output pipe and connected to the carbon separation tank, so that the exhaust gas can be directly used in the carbon separation process.
[0075] 2. Add the roasted product obtained in step 1 to 1% sodium hydroxide solution, make the solid-to-liquid ratio 1:5, leach for 50 minutes at a temperature of 80° C., and then filter to obtain filtrate and filter residue.
[0076] 3. Evaporate and concentrate the filtrate obtained in step 2 under negative pressure conditions, and at the same time connect a condensing device to recover distilled water. After the filtrate was concentrated to 20% of the original volume, the CO discharged from step 2 was passed into 2 Carry out carbonation. Keep the temperature of the solution at 60°C during ...
Embodiment 2
[0084] 1, get the filter residue obtained in step 2 in embodiment 1, and combine it with Na 2 CO 3 After mixing and stirring at a ratio of 1:1.2, roasting at a temperature of 1000° C. for 20 minutes to obtain a roasted product. During calcination, the calcination equipment is connected to the gas output pipe and connected to the carbon separation tank, and the exhaust gas is directly used in the carbon separation process.
[0085]2. Add the roasted product obtained in step 1 to 5% sodium hydroxide solution, and make the solid-to-liquid ratio 1:10, at a temperature of 50° C., leach for 60 minutes and then filter to obtain filtrate and filter residue.
[0086] 3. Evaporate and concentrate the filtrate obtained in step 2 under negative pressure conditions, and at the same time connect a condensing device to recover distilled water. After the filtrate was concentrated to 10% of the original volume, CO was introduced into the concentrated filtrate 2 , after the pH value reaches ...
Embodiment 3
[0094] 1, get the obtained filter residue of step 2 in embodiment 1: fly ash: Na 2 CO 3 After mixing in a ratio of 1:2:2, stirring evenly, and roasting at a temperature of 900° C. for 40 minutes to obtain a roasted product. During calcination, the calcination equipment is connected to the gas output pipe and connected to the carbon separation tank, so that the exhaust gas is directly used in the carbon separation process.
[0095] 2. Add the roasted product obtained in step 1 into a 15% sodium hydroxide solution, and make the solid-liquid ratio 1:15, under the condition of 80° C., leach for 80 minutes and then filter to obtain the filtrate and filter residue.
[0096] 3. Evaporate and concentrate the filtrate obtained in step 2 under negative pressure conditions, and at the same time connect a condensing device to recover distilled water. After the filtrate was concentrated to 15% of the original volume, CO was introduced into the concentrated filtrate 2 , after the pH valu...
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