Method for preparing silicon dioxide aerogel from quartz tailings as raw material
A technology of quartz tailings and silica, applied in silica, silica and other directions, can solve the problems of endangering the safety of life and property of the ecological environment, occupying a large area of land, destroying soil, etc., to achieve multi-generation and sustainable The effect of development, production cost reduction, and low equipment requirements
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Embodiment 1
[0030] In this embodiment, the method for preparing silica airgel from quartz tailings comprises the following steps:
[0031] Step 1. The quartz tailings are washed, dried, ground and passed through a 325-mesh sieve in sequence to obtain quartz tailings powder, and then the quartz tailings powder and sodium carbonate powder are ground and mixed for 30 minutes at a mass ratio of 1.2:1. The mixed powder is obtained, and then the mixed powder is placed in a muffle furnace, and calcined at a temperature of 1100° C. for 120 minutes to obtain a calcined product;
[0032] Step 2. Grinding the calcined product described in step 1 and passing it through a 200-mesh sieve, taking the undersize, and then adding the undersize into hot water at a temperature of 80° C., stirring and dissolving for 120 minutes, and obtaining water glass after filtering; The mass ratio of the undersize to hot water is 1:3;
[0033] Step 3, using hydrochloric acid with a concentration of 0.2 mol / L to adjust t...
Embodiment 2
[0039] In this embodiment, the method for preparing silica airgel from quartz tailings comprises the following steps:
[0040] Step 1, washing the quartz tailings with water, drying, grinding and passing through a 325-mesh sieve in sequence to obtain a quartz tailings powder, and then grinding and mixing the quartz tailings powder and sodium carbonate powder for 30 minutes at a mass ratio of 1.4:1, The mixed powder is obtained, and then the mixed powder is placed in a muffle furnace, and calcined at a temperature of 1200° C. for 90 minutes to obtain a calcined product;
[0041] Step 2: Grind the calcined product described in step 1 and pass it through a 200-mesh sieve, take the undersize, then add the undersize into hot water at a temperature of 70°C, stir and dissolve for 120 minutes, and obtain water glass after filtering; The mass ratio of the undersize to hot water is 1:4;
[0042] Step 3, using hydrochloric acid with a concentration of 0.3 mol / L to adjust the pH value of...
Embodiment 3
[0048] In this embodiment, the method for preparing silica airgel from quartz tailings comprises the following steps:
[0049] Step 1, washing the quartz tailings with water, drying, grinding and passing through a 325-mesh sieve in sequence to obtain a quartz tailings powder, and then grinding and mixing the quartz tailings powder and sodium carbonate powder for 30 minutes at a mass ratio of 1.5:1, The mixed powder is obtained, and then the mixed powder is placed in a muffle furnace, and calcined at a temperature of 1300° C. for 120 minutes to obtain a calcined product;
[0050] Step 2: Grind the calcined product described in step 1 and pass it through a 200-mesh sieve, take the undersize, then add the undersize into hot water at a temperature of 60°C, stir and dissolve for 150 minutes, and obtain water glass after filtering; The mass ratio of the undersize to hot water is 1:5;
[0051] Step 3, using hydrochloric acid with a concentration of 0.5 mol / L to adjust the pH value o...
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