Microwave-assisted silica fume acid leaching purification method

A microwave-assisted, micro-silica fume technology, applied in the direction of silicon oxide, silicon dioxide, etc., can solve the problems that affect the leaching rate and time of metal oxides, limit the development of micro-silica fume purification technology, and cannot be effectively removed, so as to save The effect of purification time, short purification time and high leaching efficiency

Inactive Publication Date: 2018-05-18
QINGHAI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The metal oxide impurities in micro-silica powder are mainly removed by acid leaching. The current acid leaching impurity removal technology cannot effectively remove the metal oxide impurities wrapped inside the micro-silica powder particles. The traditional acid leaching impurity removal technology uses water bath heating method , resulting in the silica fume not being completely wrapped by the acid leaching solution, the leaching reaction is hindered, which affects the leaching rate and time of metal oxides; and the traditional acid leaching process is complex and consumes high energy, which limits the purification process of micro silica fume. develop

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A microwave-assisted acid leaching method for purifying micro-silicon powder is characterized in that the method comprises the following steps: magnetic separation, calcination and quenching, and microwave acid leaching.

[0019] Magnetic separation: will contain SiO 2 70wt% 10g of microsilica and 150ml of distilled water are placed in a container at a mass ratio of 1:10 to stir and disperse. After dispersion, a magnet is placed in the container for magnetic separation. Magnetic separation is performed 4 times, each time for 10 minutes, and then dried to a moisture content of 0.3%. , The length, width and height of the magnet are 1.5cm*1cm*0.8cm.

[0020] Calcination and quenching: Calcining the magnetically separated micro-silicon powder at 650°C for 3 hours, annealing, and reducing the free carbon content to 0.05wt%, then quenching the micro-silicon powder in water at 0°C for 3 minutes to achieve complete impurity in the micro-silicon powder For exposure purposes, af...

Embodiment 2

[0023] A microwave-assisted acid leaching method for purifying micro-silicon powder is characterized in that the method comprises the following steps: magnetic separation, calcination and quenching, and microwave acid leaching.

[0024] Magnetic separation: will contain SiO 2 80wt% 12g of microsilica and 225ml of distilled water are placed in a container at a mass ratio of 1:15 to stir and disperse. After dispersion, a magnet is placed in the container for magnetic separation. Magnetic separation is performed 3 times, each time for 8 minutes, and then dried to a moisture content of 0.5%. , The length, width and height of the magnet are 1.5cm*1cm*0.8cm.

[0025] Calcination and quenching: Calcining the magnetically separated micro-silicon powder at 700°C for 3 hours, annealing, and reducing the free carbon content to 0.07wt%, then quenching the micro-silicon powder in water at 2°C for 5 minutes to achieve complete impurity in the micro-silicon powder For exposure purposes, aft...

Embodiment 3

[0028] A microwave-assisted acid leaching method for purifying micro-silicon powder is characterized in that the method comprises the following steps: magnetic separation, calcination and quenching, and microwave acid leaching.

[0029] Magnetic separation: will contain SiO 2 90wt% 10g microsilica fume and 225ml distilled water are placed in a container at a mass ratio of 1:20 to stir and disperse. After dispersion, put a magnet in the container for magnetic separation. Magnetic separation is performed twice, each time for 5 minutes, and then dried to a moisture content of 0.1%. , The length, width and height of the magnet are 1.5cm*1cm*0.8cm.

[0030] Calcination and quenching: calcining the magnetically separated micro-silicon powder at 750°C for 3 hours, annealing, and reducing the free carbon content to 1wt%, then quenching the micro-silicon powder in water at 5°C for 5 minutes to completely expose the impurities inside the micro-silicon powder purpose, followed by drying...

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Abstract

The invention relates to the field of silica fume purification methods, in particular to a microwave-assisted silica fume acid leaching purification method. The method includes the following steps ofmagnetic separation, calcination quenching and microwave acid leaching. The method has the advantages that a traditional heating mode is replaced with a microwave heating technology, so that the heating speed is rapid, leaching efficiency is high, pollution is small, energy consumption is low, the purification process is simple, and purification time is short. By conducting washing magnetic separation on silica fume and quenching pretreatment in high-temperature calcinating water before microwave acid leaching, the microwave acid leaching purification efficiency can be further improved; the phase composition of the silica fume purified through the method is not changed, and the SiO2 content is larger than 95% after purification.

Description

technical field [0001] The invention relates to the field of a method for purifying microsilica powder, in particular to a method for purifying microsilica powder by microwave-assisted acid leaching. Background technique [0002] As an industrial waste, micro-silica fume is a by-product of smelting ferrosilicon or industrial silicon. Due to its excellent physical and chemical properties such as fine particles, light weight, large specific surface area, strong pozzolanic activity, and high refractoriness, it has gradually transformed from industrial waste into an important material and is widely used in cement, concrete, ceramics, chemicals, Refractory materials, composite materials and other fields. [0003] The main component of silica fume is SiO 2 At the same time, there are some oxides and free carbon impurities such as K, Na, Ca, Mg, etc., and the magnetic substances such as iron tetroxide mixed in the production process of micro-silicon powder also affect the purity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
CPCC01B33/12C01P2006/80
Inventor 铁生年张世鹏柳馨
Owner QINGHAI UNIVERSITY
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