A method for preparing coal slime-based carbon-silicon dioxide composite reinforcing agent with coal slime as raw material
A technology of silica and reinforcing agent is applied in the field of preparing coal slime-based carbon-silica composite reinforcing agent, and can solve the problems of high ash content, low calorific value, low content of fixed carbon in coal slime, etc.
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Embodiment 1
[0024] 1) Put slime in N 2 Roasting treatment at 750°C under air atmosphere, heat preservation for 4 hours, to obtain pre-activated carbonized coal slime;
[0025] 2) Add carbonized coal slime with a particle size of ≤20 μm into a hydrochloric acid solution with a concentration of 20%, acid leaching and stirring for 4 hours; the mass ratio of carbonized coal slime to hydrochloric acid solution is 1:1.75; then use distilled water to filter and wash to medium property, to obtain acid leaching coal slime residue;
[0026] 3) Add NaOH solution with a concentration of 10% to the acid leaching coal slime residue, the mass ratio of acid leaching coal slime residue to NaOH is 1:0.35; stir and react at 80°C for 3h;
[0027] 4) Add 10% hydrochloric acid solution to the reactant obtained in step 3) at a temperature of 50°C, adjust the pH value to 5.0, stir and react for 6 hours, then filter and wash with distilled water until neutral to obtain a slime base Carbon-silicic acid complex; ...
Embodiment 2
[0032] First, put the slime in N 2 Under the condition of 800°C in an air atmosphere, the roasting treatment was carried out, and the temperature was kept for 4 hours to obtain pre-activated carbonized coal slime; then, the carbonized coal slime with a particle size of ≤20 μm was added to a hydrochloric acid solution with a concentration of 15%, and the acid leaching and stirring treatment was carried out for 5 hours; Wherein the mass ratio of carbonized coal slime and hydrochloric acid solution is 1:1.50; Afterwards, filter and wash with distilled water to neutrality to obtain acid leaching coal slime residue; then, add NaOH with a concentration of 15% to the acid leaching coal slime residue Solution, acid leaching coal slime residue and NaOH mass ratio is 1:0.45; Stir and react at 80°C for 3h; After that, add 10% hydrochloric acid solution to the reactant obtained in step 3) at 40°C , adjust the pH value to 5.5, stir and react for 7 hours, then filter and wash with distilled...
Embodiment 3
[0035] First, put the slime in N 2 Roasting treatment at 850°C under air atmosphere, heat preservation for 4 hours, to obtain pre-activated carbonized coal slime; then, carbonized coal slime with particle size ≤ 20 μm was added to hydrochloric acid solution with a concentration of 20%, and acid leached and stirred for 4 hours; Wherein the mass ratio of carbonized coal slime to hydrochloric acid solution is 1:1.25; Afterwards, filter and wash with distilled water to neutrality to obtain acid leached coal slime residue; then, add NaOH with a concentration of 15% to the acid leached coal slime residue solution, the mass ratio of acid leaching coal slime residue to NaOH is 1:0.45; stir and react at 90°C for 4h; after that, add 10% hydrochloric acid solution to the reactant obtained in step 3) at 40°C , adjusted the pH value to 5.0, stirred and reacted for 6 hours, then filtered and washed with distilled water until neutral to obtain a coal slime-based carbon-silicic acid composite...
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