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Method for preparing precipitated silica by adopting micro-silica fume as raw material

A technology for precipitating silica and microsilica, applied in the removal of silica, silica, solid waste, etc., can solve problems such as the lack of high-performance silica preparation methods, achieve resource-based products, reduce cost, effect of reducing greenhouse gas emissions

Inactive Publication Date: 2012-01-18
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silica fume is rich in highly active silica resources, but there is still a lack of high-performance white carbon black preparation methods suitable for the raw material characteristics of microsilica fume, simple process, and low cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Weigh 80kg of silica fume (SiO 2content of 82.8% (wt)) placed in the premix tank, adding 30% (wt) of sodium hydroxide into SiO 2 : NaOH mol ratio is 1.45: 1 premix; Pass into hot water directly preheat to 90 ℃ with premix, squeeze into hot alkali dissolution kettle with slurry pump, add water and adjust slurry solid-liquid ratio to be 30% ( wt); Directly feed water steam to heat, control the pressure of the cooking kettle to 0.485MPa, the temperature to 150°C, and keep the heat and pressure for 2.5 hours. After heat preservation and filtration, SiO in water glass is obtained 2 The content is 12.60% (wt), and the modulus is 2.8.

[0026] (2) in the carbonization reactor, SiO in the water glass that step (1) makes 2 The content is adjusted to 7.0% (wt), the temperature is adjusted to 80°C, and 0.2kg / m of surfactant is added 3 Fatty alcohol polyoxyethylene ether sodium sulfate (AES) and 0.15kg / m 3 Polyethylene glycol (PEG) is an additive. Inject 30% (v / v) CO 2 T...

Embodiment 2

[0029] (1) Weigh 120kg of silica fume (SiO 2 The content is 92.13% (wt)) placed in the premix tank, adding 40% (wt) of sodium hydroxide to make SiO 2 : NaOH mol ratio is 1.15: 1 premix; Pass into hot water directly preheat to 70 ℃ with premix, squeeze into hot alkali dissolution kettle with slurry pump, add water and adjust slurry solid-liquid ratio to be 25% ( wt); Directly feed water steam to heat, control the pressure of the cooking kettle to 0.63MPa, the temperature to 160°C, and hold the heat for 1.5 hours. After heat preservation and filtration, SiO in water glass is obtained 2 The content is 8.60% (wt), and the modulus is 2.2.

[0030] (2) in the carbonization reactor, the SiO in the water glass that step (1) makes 2 The content is adjusted to 4.00% (wt), the temperature is adjusted to 70°C, and 1.5kg / m of surfactant is added 3 Sodium dodecylbenzenesulfonate (LAS) and 0.5kg / m 3 Sodium stearate is an additive. Introduce 18.5% (v / v)) CO 2 The mixed gas undergoes ca...

Embodiment 3

[0033] (1) Weigh 140kg of silica fume (SiO 2 The content is 83.3% (wt) and placed in the premix tank, adding 50% (wt) of sodium hydroxide to make SiO 2 : NaOH mol ratio is 1.30: 1 premix; Pass into hot water directly preheat to 80 ℃ with premix, squeeze into hot alkali dissolution kettle with slurry pump, add water and adjust slurry solid-liquid ratio to be 20% ( wt); Directly feed water steam to heat, control the pressure of the cooking kettle to 1.58MPa, the temperature to 200°C, and keep the heat and pressure for 1.5 hours. After heat preservation and filtration, SiO in water glass is obtained 2 The content is 15.30% (wt), and the modulus is 2.56.

[0034] (2) in the carbonization reactor, the SiO in the water glass that step (1) makes 2 The content is adjusted to 8.5% (wt), the temperature is adjusted to 65°C, and 0.85kg / m of surfactant is added 3 Polyethylene glycol (PEG) is an additive. Inject 30% (v / v) CO 2 The mixed gas undergoes carbonization reaction, and the p...

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Abstract

The invention relates to a method for preparing precipitated silica by adopting micro-silica fume as a raw material, and belongs to the technical field of high value utilization of ferrosilicon alloy industrial waste. The method comprises the following steps: adopting micro-silica fume as a raw material, adding sodium hydroxide to prepare a premix; carrying out a preheating treatment to a temperature of 40-95 DEG C, and adjusting a solid content to 15-45 wt% in a hot alkali dissolving and boiling kettle; introducing water vapor, heating to the temperature of 120-220 DEG C, holding the pressure and the temperature for 1-6 hours, then carrying out filtration and separation to obtain a sodium silicate solution; adding hot water to the sodium silicate solution until the SiO2 content is 2.5-12.0 wt% and the temperature is 40-95 DEG C, then adding a surfactant and introducing CO2, stopping the reaction when the pH value is reduced to 8.5-10.0, then carrying out filtration and separation to obtain solid filter residues; preparing the residues into the suspension liquid having the residue content of 15-40 wt%, then adding an inorganic acid, an organic acid or a mixed solution comprising an inorganic acid and an organic acid, aging for 0.5-2.0 hours to prepare the silica. The method provided by the present invention has the following advantages that: the micro-silica fume is adopted as the raw material; the silica is synthesized through the carbonization method; the integration of the carbon dioxide capturing and the resource utilization process of the industrial waste is realized; the greenhouse gas emission is reduced; a new method for low-cost production of the silica is provided.

Description

technical field [0001] The invention belongs to the technical field of high-value utilization of ferrosilicon alloy industrial waste, and relates to a method for preparing precipitated white carbon black by carbonizing micro-silicon powder as a raw material. Background technique [0002] Micro-silica fume is silicon-containing industrial dust collected from fumes generated in submerged thermal electric furnaces during the production of ferrosilicon alloys. Amorphous SiO in silica fume 2 The content is generally up to 85% to 96%, the particle size is below 10μm, and it has strong chemical activity when reacting with lye. Microsilica fume can be used as cement raw material, and can also be used as filling material for rubber, resin and other organic compounds. At present, due to the small market capacity, it is difficult to sell the micro-silicon fume recovered by domestic enterprises. Most enterprises can only pile up the collected micro-silica fume at will, which not only...

Claims

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Application Information

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IPC IPC(8): C01B33/12B09B3/00
CPCY02W30/20
Inventor 林荣毅郭占成支歆古明远公旭中
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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