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

Active Publication Date: 2017-02-22
SHANGLUO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of accumulation of quartz tailings not only wastes resources, but also occupies a large area of ​​land and destroys the soil. Due to its extremely fine characteristics, "it will be lost when it meets water, and it will fly when it is dried", which is very easy to cause natural disasters such as mudslides and sandstorms. Seriously endanger the ecological environment and people's life and property safety

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention provides a method for preparing silicon dioxide aerogel from quartz tailings as a raw material. The method comprises the following steps: step 1, the quartz tailings are washed, dried, ground and sieved and then ground and mixed with sodium carbonate powder, a mixture is calcined, and a calcination product is obtained; step 2, the calcination product is ground and sieved, undersized matter is added to hot water to be stirred and dissolved, the solution is filtered, a filtrate is taken, and water glass is obtained; step 3, the pH value of the water glass is regulated with hydrochloric acid, a sol-gel reaction is performed, a product is left to stand for aging, and hydrogel is obtained; step 4, free water in the hydrogel is filtered out, residual moisture is replaced with absolute ethyl alcohol, and alcogel is obtained; step 5, the alcogel is soaked with an n-hexane solution of trimethylchlorosilane, and hydrophobically modified alkane gel is obtained; step 6, drying is performed, and the silicon dioxide aerogel is obtained. The raw materials are cheap and available, the preparation process adopts mild conditions and has low equipment requirements, so that the production cost of the silicon dioxide aerogel is reduced greatly, and the prepared aerogel has good performance.

Description

technical field [0001] The invention belongs to the technical field of silica airgel, and in particular relates to a method for preparing silica airgel by using quartz tailings as raw materials. Background technique [0002] Silica airgel is composed of nano-scale pores and silica inorganic polymer three-dimensional nano-skeleton, high porosity, up to 99.8%; high specific surface area, up to 1000m 2 More than / g; low density, can be as low as 0.003g / cm 3 . It has the advantages of low refractive index, small Young's modulus, low acoustic impedance, low thermal conductivity, and strong adsorption performance. It has unique properties in chemistry, heat, optics, acoustics, and electricity. , Building materials, electronics, metallurgy and many other fields have broad application prospects. But at present, the production of silica airgel mostly uses organic matter such as ethyl orthosilicate and butyl orthosilicate as the silicon source, and is obtained by sol-gel reaction a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/16
CPCC01B33/16C01P2006/10C01P2006/12C01P2006/16C01P2006/17
Inventor 李建涛周春生金振国刘彦峰庄肃凯王建芳孙强强
Owner SHANGLUO UNIV
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