Preparation method for synthesizing tobermorite through using blast furnace slag as raw material

A blast furnace slag and tobermorite technology, which is applied in the removal of silicates, alkaline earth metal silicates and solid wastes, etc., can solve the problems of large plant area, easy explosion in production and large water consumption, etc. The effect of less equipment investment, low production cost and strong adsorption capacity

Active Publication Date: 2012-10-24
HUBEI FORBON TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the water quenching slag method consumes a lot of water, and the production is pr...

Method used

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  • Preparation method for synthesizing tobermorite through using blast furnace slag as raw material
  • Preparation method for synthesizing tobermorite through using blast furnace slag as raw material
  • Preparation method for synthesizing tobermorite through using blast furnace slag as raw material

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Experimental program
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Effect test

Embodiment 1

[0023] 1) Crushing and grinding the blast furnace slag to a particle size of 100 mesh, according to mass percentage, blast furnace slag 50%, quicklime 25%, silicon dioxide 25%, control CaO / SiO 2 The molar ratio is 0.8, mix the material and water evenly and pour it into the reaction kettle, the temperature of the reaction kettle is raised, the reaction temperature is kept at 150°C, and the reaction time is 6h. After the reaction is completed, cool and filter to obtain a white solid substance, which is washed and dried to obtain Tobermorite. The spectrum of tobermorite obtained is shown in figure 1 The XRD diffraction pattern.

[0024] 2) The above-mentioned hydrothermally synthesized tobermelite is used to treat high-concentration phosphorus-containing wastewater from pig farms. The phosphorus concentration is 155mg / L, and 4.0g of the above-mentioned hydrothermally-synthesized tobermorite is added to each liter of phosphorus-containing wastewater stone, stirred and reacted fo...

Embodiment 2

[0026] 1) Crushing and grinding the blast furnace slag to a particle size of 200 mesh, according to mass percentage, blast furnace slag 60%, quicklime 20%, silicon dioxide 20%, control CaO / SiO 2 The molar ratio is 1.0, the material and water are evenly mixed and poured into the reaction kettle, the temperature of the reaction kettle is raised, and the reaction temperature is kept at 180° C., and the reaction time is 8 hours. After the reaction is finished, cool and filter to obtain a white solid, which is washed and dried to obtain tobermorite. The spectrum of tobermorite obtained is shown in figure 2 The XRD diffraction pattern.

[0027] 2) The above hydrothermally synthesized tobermorite is used to treat high-concentration phosphorus-containing wastewater from pig farms. The phosphorus concentration is 155mg / L. Add 3.0g of tobermorite to each liter of phosphorus-containing wastewater, and stir for 1 hour. , the phosphorus content in the effluent wastewater was 0.39 mg / L. ...

Embodiment 3

[0029] 1) Crushing and grinding the blast furnace slag to a particle size of 200 mesh, according to mass percentage, blast furnace slag 65%, quicklime 15%, silicon dioxide 20%, control CaO / SiO 2 The molar ratio is 0.8, the material and water are evenly mixed and poured into the reaction kettle, the temperature of the reaction kettle is raised, and the reaction temperature is kept at 200° C., and the reaction time is 10 hours. After the reaction is finished, cool and filter to obtain a white solid, which is washed and dried to obtain tobermorite. The spectrum of tobermorite obtained is shown in image 3 The XRD diffraction pattern.

[0030] 2) Use the above-mentioned hydrothermally synthesized tobermorite to treat domestic phosphorus-containing wastewater. The phosphorus concentration is 15mg / L. Add 1.0g of tobermorite to each liter of phosphorus-containing wastewater, stir for 1 hour, and put it in the effluent wastewater The phosphorus content is 0.15 mg / L.

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Abstract

The invention relates to a preparation method for synthesizing tobermorite through using blast furnace slag as a raw material. The tobermorite is obtained through the hydrothermal synthesis of raw materials comprising 50-70% by mass of the blast furnace slag, 10-25% by mass of quicklime and 10-25% by mass of silica. The preparation method comprises the following steps: 1, grinding the 50-70% of blast furnace slag until the granularities are 100-200 meshes, uniformly mixing the materials comprising 50-70% of the ground blast furnace slag, 10-25% of the quicklime and 10-25% of the silica, and water with a molar ratio of CaO/SiO2 being 0.8-1.2, and pouring the obtained mixture to a reaction vessel; 2, heating the reaction vessel, and reacting at 150-220DEG C for 6-10h; and 3, cooling and filtering after reaction ending to obtain white solid substances, washing, and drying to obtain the tobermorite. The tobermorite is synthesized through the hydrothermal synthesis of a blast furnace iron making byproduct which is used as the primary raw material, so waste utilization is effectively carried out. The prepared tobermorite has a good phosphorous removal effect when the tobermorite is used for phosphorus-containing wastewater treatment.

Description

technical field [0001] The invention relates to a preparation method for synthesizing tobermorite by using blast furnace slag as a raw material, which is used in the field of wastewater treatment in environmental protection. Background technique [0002] BF slag treatment methods are mainly divided into dry slag and water quenched slag. The cost of dry slag treatment is relatively high, and the pollution is relatively serious, so it is rarely used now. At present, blast furnace slag is mostly made into water slag by water quenching, which becomes the raw material for making slag cement or slag brick. In addition, water slag can also be made into slag brick and used as heat insulation filler. However, the water quenching slag method consumes a lot of water, and the production is prone to explosion. The whole set of equipment occupies a large area and pollutes the environment. [0003] In order to overcome the above problems, researchers have adopted various methods to impro...

Claims

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Application Information

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IPC IPC(8): C01B33/24B09B3/00
Inventor 沙淮丽王仁宗刘裕
Owner HUBEI FORBON TECH
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