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Process for preparing water glass from silicon micropowder by using wet method

A technology of micro-silica powder and water glass, which is applied in silicate, alkali metal silicate and other directions, can solve the problems of low dissolution rate and high alkali consumption, and achieve the effect of simple process flow, low cost and solving technical obstacles.

Inactive Publication Date: 2012-04-25
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the energy consumption is lower than that of the dry method, the crystalline form of SiO in quartz sand 2 Low dissolution rate and high alkali consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1. Weigh 120kg of micro-silica fume and place it in the batching tank, and analyze to get SiO 2 The content is 83.3% (wt). Add sodium hydroxide concentration and be 50% (wt) lye, mix solution SiO 2 :NaOH molar ratio adjusted to 1.30:1.

[0018] 2. Pump the mixed liquid prepared in step 1 into the stirred liquid phase reaction kettle under the stirring state, and directly heat the reaction kettle by passing water vapor. When the pressure in the kettle reaches 0.6MPa, the steam supply is stopped; the pressure in the kettle is kept at 0.6MPa, the temperature is controlled at 158° C., and the water glass mixture is prepared by keeping the pressure for 3 hours.

[0019] 3. The reactor is depressurized to 0.3MPa, and the water glass mixture obtained in step 2 is discharged from the reactor through residual pressure, and enters the buffer tank of the feed liquid. Add water to the feed liquid buffer tank to adjust the temperature of the water glass mixture to 90°C, pressuriz...

Embodiment 2

[0021] 1. Weigh 160kg of micro-silica fume and place it in the batching tank, and analyze to get SiO 2 The content is 78.2% (wt). Add sodium hydroxide concentration and be 50% (wt) lye, mix solution SiO 2 :NaOH molar ratio adjusted to 1.80:1.

[0022] 2. Pump the mixed liquid prepared in step 1 into the stirred liquid phase reaction kettle under the stirring state, and directly heat the reaction kettle by passing water vapor. Control the temperature in the kettle to 70°C, and react for 6 hours to prepare the water glass mixture.

[0023] 3. Discharge the water glass mixture obtained in step 2 from the reaction kettle and enter the feed liquid buffer tank. Add water to the feed liquid buffer tank to adjust the temperature of the water glass mixture to 50°C, pressurize and filter the plate and frame, and obtain the filtrate as water glass. SiO in water glass was analyzed by silicon molybdenum blue spectrophotometry. 2 The content is 8.60% (wt), the modulus is 3.2, SiO in mi...

Embodiment 3

[0025] 1. Weigh 160kg of micro-silica fume and place it in the batching tank, and analyze to get SiO 2 The content is 92.2% (wt). Add sodium hydroxide concentration and be 30% (wt) lye, mix solution SiO 2 :NaOH molar ratio adjusted to 1.40:1.

[0026] 2. Pump the mixed liquid prepared in step 1 into the stirred liquid phase reaction kettle under the stirring state, and directly heat the reaction kettle by passing water vapor. When the pressure in the kettle reaches 0.8MPa, the steam supply is stopped; the pressure in the kettle is maintained at 0.8MPa, the temperature is controlled at 170° C., and the water glass mixture is prepared by keeping the pressure for 3 hours.

[0027] 3. The pressure of the reaction kettle is reduced to 0.15MPa, and the water glass mixture obtained in step 2 is discharged from the reaction kettle through the residual pressure, and enters the feed liquid buffer tank. Add water to the feed liquid buffer tank to adjust the temperature of the water gl...

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PUM

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Abstract

The invention provides a process for preparing water glass from silicon micropowder by using the wet method, belonging to the technical field of production of water glass. The process comprises the following steps: analyzing the content of SiO2 in silicon micropowder; mixing silicon micropowder and liquid alkali according to a mol ratio of 0.9-1.8:1; delivering obtained mixed liquor into a liquidphase reaction vessel under agitation; allowing steam to enter into the reaction vessel to heat the mixed liquor; carrying out a dwell reaction at a temperature of 70 to 220 DEG C for 0.5 to 6 h so as to prepare mixed liquor of water glass; discharging the mixed liquor of water glass out from the reaction vessel; adjusting the temperature of the mixed liquor of water glass to 50 to 95 DEG C in a feed liquid buffer tank; carrying out plate and frame pressurized filtering to obtain a filtrate which is water glass with a modulus of 1.80 to 3.20. The invention has the following advantages: since the water glass is prepared by using dust in the ferrosilicon alloy industry as a raw material and employing the characteristic that the reaction between amorphous SiO2 in silicon micropowder and alkali liquid has high activity, high conversion efficiency is obtained, the process is simple, the problem of dust pollution in the ferrosilicon alloy industry is overcome, and good economic benefits andsocial benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of water glass production. In particular, it relates to a method for preparing water glass by using micro-silicon powder wet method. Background technique [0002] Micro-silica powder is silicon-containing industrial dust formed by rapid oxidation and condensation of SiO and Si gas generated in submerged electric furnace during the production process of ferrosilicon alloy and industrial silicon. Microsilica fume belongs to inhalable particulate matter (PM10). After being absorbed by the human body, microsilica fume directly enters the lungs, which is extremely harmful to the human body. In recent years, with the strengthening of environmental protection by the state, ferrosilicon alloy and industrial silicon production enterprises are forced to install environmental protection dust removal equipment, and the output of micro silicon fume recovered by ferrosilicon alloy enterprises continues to increase. [0...

Claims

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Application Information

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IPC IPC(8): C01B33/32
Inventor 郭占成林荣毅支歆王志公旭中
Owner UNIV OF SCI & TECH BEIJING
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