Method for preparing white carbon black cogeneration nanometer calcium carbonate by integrally utilizing micro silicon powder

A technology of nano-calcium carbonate and micro-silicon fume, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, products, etc., can solve the problem of lack of effective control methods for the particle size and shape of precipitated calcium carbonate, and achieve the reduction of greenhouse gas emissions Effect

Inactive Publication Date: 2012-04-25
INST OF PROCESS ENG CHINESE ACAD OF SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But current technology only involves causticization process Na 2 CO 3 The adjustment of causticization rate lacks an effective control method for the adjustment of sodium hydroxide concentration and the particle size and shape of precipitated calcium carbonate

Method used

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  • Method for preparing white carbon black cogeneration nanometer calcium carbonate by integrally utilizing micro silicon powder
  • Method for preparing white carbon black cogeneration nanometer calcium carbonate by integrally utilizing micro silicon powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Thermal alkali dissolution of microsilica fume: Weigh 140kg of microsilica fume, mix microsilica fume and NaOH by SiO 2 : NaOH molar ratio is 1.20: 1 to make premix; Feed liquid is preheated to 75 ℃, sends into hot alkali dissolution kettle with slurry pump; Add water to control feed liquid solid content to be 25% (wt), pass into water The hot steam is directly heated, the pressure is controlled at 0.60MPa, the temperature is controlled at 159°C, and the heat preservation and pressure are maintained for 2.0 hours; the feed liquid is filtered to make water glass with a modulus of 2.35.

[0034] 2) Calcination of limestone: Limestone and coking coal are added to the lime kiln, and the temperature in the kiln is controlled at about 1100°C. The limestone is calcined to produce lime; the lime is digested to produce coarse lime milk, which is filtered through a 200-mesh filter to obtain refined lime milk for use. The effective calcium oxide content in milk of lime is about...

Embodiment 2

[0038] 1) Thermal alkali dissolution of microsilica fume: Weigh 80kg of microsilica fume, mix microsilica fume and NaOH by SiO 2 : NaOH molar ratio is 1.50: 1 to make premix; Feed liquid is preheated to 50 ℃, sends into hot alkali dissolution kettle with slurry pump; Add water to control feed liquid solid content to be 35% (wt), pass into water The hot steam is directly heated, the pressure is controlled at 0.48MPa, the temperature is controlled at 150°C, and the heat preservation and pressure are maintained for 3.0 hours; the feed liquid can be made into water glass with a modulus of 2.95 after filtration.

[0039] 2) Calcination of limestone: Limestone and coking coal are added into the lime kiln, the temperature in the kiln is controlled between 980°C, and the limestone is calcined to produce lime; the lime is digested to obtain coarse lime milk, which is then filtered through a 120-mesh filter to obtain refined lime milk to be The effective calcium oxide content in milk of...

Embodiment 3

[0043] 1) Hot alkali dissolution of microsilica fume: mix microsilica fume and NaOH by SiO 2 : NaOH molar ratio is 0.85: 1 to make premix; Feed liquid is preheated to 95 ℃, is sent into hot alkali dissolution kettle with slurry pump; Add water and control feed liquid solid content to be 20% (wt), pass into water The hot steam is directly heated, the pressure is controlled at 0.80MPa, the temperature is controlled at 170°C, and the heat preservation and pressure are maintained for 1.0 hours; the material liquid can be made into water glass with a modulus of 1.70 after filtration.

[0044] 2) Calcination of limestone: Limestone and coking coal are added to the lime kiln, and the temperature in the kiln is controlled between 1200°C. The limestone is calcined to produce lime; the lime is digested to produce coarse lime milk, which is filtered through a 200-mesh filter to obtain refined lime milk for use , The effective calcium oxide content in milk of lime is about 40% (wt). The ...

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Abstract

The invention relates to a method for preparing white carbon black cogeneration nanometer calcium carbonate by integrally utilizing micro silicon powder, which belongs to the technical field of integrative utilization of silicon iron alloy industrial waste resources and industrial kiln gas carbon dioxide. The method comprises the following process steps that: micro silicon powder is dissolved by sodium hydroxide hot alkali for preparing water glass; lime is prepared through lime stone calcination, and carbon dioxide raw material gas is released; precipitated silica is prepared through water glass carbonization; carbonization filter liquid is subject to sodium carbonate causticization for preparing sodium hydroxide solution to coproduce nanometer calcium carbonate; and the sodium hydroxide solution is circulated to a hot alkali dissolving and boiling kettle for dissolving micro silicon powder to prepare water glass. The method has the advantages that the process circulation of integrally utilizing the micro silicon powder for preparing the white carbon black cogeneration nanometer calcium carbonate is realized, and a new method is provided for goals of changing metallurgy chemical industrial waste materials into resources and utilizing the waste materials at high value.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of ferrosilicon alloy industrial waste resources and industrial kiln gas carbon dioxide, and in particular relates to a method for comprehensively utilizing micro silicon powder to prepare white carbon black and co-produce nanometer calcium carbonate. Background technique [0002] In the production process of ferrosilicon alloy and industrial silicon, a large amount of highly volatile SiO and Si gases produced in the submerged electric furnace are rapidly oxidized by air and condensed into a large amount of silicon-containing industrial dust, which is called micro-silicon powder. Amorphous SiO in silica fume 2 The content is generally up to 85% to 96%, the particle size is about 0.3μm, and it has strong chemical activity. 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 t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12C01F11/18B82Y40/00
CPCY02P20/141
Inventor 林荣毅郭占成李巨才白涛公旭中
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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