Method for preparing silicon dioxide aerogel from coal gasification furnace slag
A technology of coal gasification slag and silicon dioxide, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problems of easy pollution of the environment and huge output, and achieve low cost, high specific surface area, and simple preparation methods Effect
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Embodiment 1
[0022] Step 1. Pretreatment of the silicon source: take an appropriate amount of gasification slag and Na 2 CO 3 The additives were mixed at a mass ratio of 1:1.0, then fully ground, and then calcined at 950°C for 2.5 hours in an air atmosphere to obtain a sintered product of gasification slag.
[0023] Step 2. Gel preparation process: Take 10 g of the sintered gasification slag, dissolve it in 80 mL of deionized water, and stir to fully dissolve the two, then add 30 mL of concentrated hydrochloric acid with a concentration of 12 mol / L, stir at room temperature for 30 min, and The obtained sol is centrifuged to remove the insoluble matter, and then the sol is heated to evaporate the water in it, and then it is allowed to stand still to transform from the sol phase to the gel phase.
[0024] Step 3, remove miscellaneous ions: wash the gel with water after the gel is formed until the filtrate is neutral, and remove the Na in the wet gel + , Cl - .
[0025] Step 4. Dry the ob...
Embodiment 2
[0027] Step 1. Pretreatment of the silicon source: take an appropriate amount of gasification slag and CaO additives at a mass ratio of 1:1.1, mix them thoroughly, and then calcine them at 900°C for 3 hours in an air atmosphere to obtain sintered gasification slag things.
[0028] Step 2. Gel preparation process: take 5 g of the sintered product of gasification slag, dissolve it in 35 mL of deionized water, and stir to fully dissolve the two, then add 40 mL of hydrochloric acid with a concentration of 1 mol / L to make the pH 2, and then Stir at room temperature for 45 minutes, remove the insoluble matter from the obtained sol by means of centrifugation, then heat the sol to evaporate the water in it, and then let it stand still to transform from the sol phase to the gel phase.
[0029] Step 3, remove miscellaneous ions: wash the gel with water after the gel is formed until the filtrate is neutral, and remove the Na in the wet gel + , Cl - .
[0030] Step 4, drying the obtain...
Embodiment 3
[0032] Step 1. Pretreatment of the silicon source: take an appropriate amount of gasification slag and Na 2 CO 3 The additives are mixed at a mass ratio of 1:1.15, then fully ground, and then calcined at 1000°C for 2 hours in an air atmosphere to obtain a sintered product of gasification slag.
[0033] Step 2. Gel preparation process: Take 5g of sintered gasification slag, dissolve it in 30mL of deionized water, and stir to fully dissolve the two, then add hydrochloric acid with a concentration of 1mol / L to make the pH value about 2, After stirring at room temperature for 20 minutes, add ammonia water with a concentration of 1 mol / L, dilute to a pH value of about 6, remove the insoluble matter from the obtained sol by centrifugation, then heat the sol to evaporate the water, and then let it stand From sol phase to gel phase transition.
[0034] Step 3, remove miscellaneous ions: wash the gel with water after the gel is formed until the filtrate is neutral, and remove the Na ...
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