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Method for simultaneously preparing iron oxide and silicon dioxide aerogel from iron tailings

A technology for silica and iron tailings, applied in the fields of iron oxide/hydroxide, chemical instruments and methods, iron oxide, etc., can solve the problem of increased cost of silica aerogels, harsh drying conditions, and large investment in equipment, etc. problems, to achieve the effects of easy large-scale production, alleviating environmental pressure, and reducing environmental pollution

Active Publication Date: 2018-10-16
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at the same time, supercritical drying also has factors such as high energy consumption, large investment in equipment, and harsh drying conditions, which greatly increase the cost of producing silica airgel.

Method used

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  • Method for simultaneously preparing iron oxide and silicon dioxide aerogel from iron tailings
  • Method for simultaneously preparing iron oxide and silicon dioxide aerogel from iron tailings
  • Method for simultaneously preparing iron oxide and silicon dioxide aerogel from iron tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1 prepares iron oxide powder and silica airgel

[0037] Embodiment 1 of the present invention uses iron tailings as raw material to prepare iron oxide powder and silica airgel, such as figure 1 shown, including the following steps:

[0038] (1) The raw materials include at least iron tailings in North China (the mass percentages of its components are as follows: SiO2 45.43%, CaO13.81%, MgO 13.10%, Al2O3 11.35%, Fe2O3 10.13%, and the balance is impurities), hydrogen Sodium oxide, hydrochloric acid, n-hexane, trimethylchlorosilane, absolute ethanol, concentrated ammonia water;

[0039] (2) Pass the finely ground iron tailings through a 100-mesh sieve, then put it into a muffle furnace and heat it to 850°C, and keep the temperature for 4.5 hours to obtain activated iron tailings powder;

[0040] (3) Mix the activated tailings powder with 2mol / L hydrochloric acid at a volume ratio of 1:1.6 and stir for 2 hours, filter to obtain the filter residue and dry it, an...

Embodiment 2

[0054] Embodiment 2 prepares iron oxide powder and silica airgel

[0055] Example 2 of the present invention uses iron tailings as raw materials to prepare iron oxide powder and silica airgel, including the following steps:

[0056] (1) The raw materials include at least iron tailings in North China, sodium hydroxide, hydrochloric acid, n-hexane, trimethylchlorosilane, absolute ethanol, and concentrated ammonia water;

[0057] (2) Pass the ground iron tailings through a 100-mesh sieve, put them into a muffle furnace and heat them to 950°C, and keep the temperature for 5.5 hours to obtain activated tailings powder;

[0058] (3) Mix the activated tailings powder with 1.5mol / L hydrochloric acid at a volume ratio of 1:2.2 and stir for 2 hours, filter to obtain the filter residue and dry it, and collect the filtrate in a container;

[0059] (4) Mix the filter residue and sodium hydroxide at a mass ratio of 1:2.2 and stir evenly, and keep in a muffle furnace at 600°C for 2.5 hours ...

Embodiment 3

[0067] Embodiment 3 prepares iron oxide powder and silica airgel

[0068] Embodiment 3 of the present invention uses iron tailings as raw materials to prepare iron oxide powder and silica airgel, including the following steps:

[0069] (1) The raw materials include at least iron tailings in North China, sodium hydroxide, hydrochloric acid, n-hexane, trimethylchlorosilane, absolute ethanol, and concentrated ammonia water;

[0070] (2) Pass the finely ground iron tailings through a 100-mesh sieve, then put them into a muffle furnace and heat them to 900°C, and keep the temperature for 5 hours to obtain activated tailings powder;

[0071] (3) Mix the activated tailings powder with 2mol / L hydrochloric acid at a volume ratio of 1:1.7 and stir for 4 hours, filter to obtain the filter residue and dry it, and collect the filtrate in a container;

[0072] (4) Mix the filter residue and sodium hydroxide at a mass ratio of 1:1.8 and stir evenly, and keep in a muffle furnace at 550°C for...

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Abstract

The invention discloses a method for simultaneously preparing iron oxide and silicon dioxide aerogel from iron tailings. The method is a way of recycling iron tailings which are solid waste with low cost and low reaction conditions, and comprises following steps: pretreatment of the iron tailings; acid pickling for iron extraction; alkali dissolution for silicon extraction; sol gelatinization; gelaftertreatment; iron oxide powder preparation and normal-temperature drying. Tests prove that the prepared silicon dioxide aerogel has lower density and higher porosity; the prepared iron oxide powder has the characteristics of small grain size and uniform distribution. Therefore, the prepared iron oxide powder and silicon dioxide aerogel have excellent performance and extensive using value. Theraw materials are widely sourced, the cost is low, the requirement for equipment is low, the reaction conditions are mild, and the method is applicable to large-scale production.

Description

technical field [0001] The invention belongs to the technical field of inorganic materials, and in particular relates to a method for preparing iron oxide powder and silicon dioxide nanometer materials from iron tailings. Background technique [0002] Iron tailings are the wastes discharged after the ore concentrator grinds iron ore and selects useful components. The stockpiling of iron tailings not only takes up a lot of land resources, but also causes serious environmental pollution. Some old tailings ponds also have potential safety hazards. Since the main chemical components of iron tailings are silicon, aluminum, iron, magnesium, calcium, etc., how to rationally utilize the elements contained in them to achieve the effect of waste recycling is a difficult problem in front of people. [0003] Ferric oxide powder is an important industrial raw material, used for coloring paint, rubber, plastic, construction, etc. It is an inorganic pigment and used as an antirust pigment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06C01B33/158C01B33/152B82Y40/00
CPCB82Y40/00C01B33/152C01B33/1585C01G49/06C01P2002/82C01P2004/03C01P2004/64C01P2006/11C01P2006/17
Inventor 王建国宋鑫包志康张志军
Owner ZHEJIANG UNIV OF TECH