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Method for preparing silica through coal gangue aluminum extraction waste slag

A technology for coal gangue and white carbon black, which is applied in the field of preparing white carbon black, can solve the problems of difficult industrial production, different aluminum content of aluminum extraction waste residues, and difficult control of reaction conditions, and achieves high product purity and easy control of reaction conditions. Effect

Inactive Publication Date: 2013-12-04
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this patent, the particle size of the mixture is required to be higher (1-50 μm), and the molten product is in a molten state, which is not easy for industrial production
In addition, because the content of silicon and aluminum in coal gangue varies greatly due to different production areas, the content of silicon and impurity aluminum in the waste slag of aluminum extraction is different, and the reaction conditions are not easy to control.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0021] Take by weighing 100g waste residue 1, 90g quartz sand mix, make SiO 2 The total content is 91.6%, Al 2 o 3 The content is 5%, then according to SiO 2 :Na 2 O molar ratio = 1:0.43 Add 132g of sodium carbonate, mix and grind into a powder mixture of about 100μm with a ball mill. Weigh 100 g of the mixed sample and put it into a rotary furnace, set the temperature at 820° C. for 3 hours, and obtain coarse sodium silicate solid particles after the reaction is completed. Put the above crude sodium silicate particles in a 1L autoclave, add 250mL of distilled water according to the solid-to-liquid ratio of 1:3, heat up to 200°C, stir and dissolve for 3 hours, then cool down to room temperature, filter and separate to obtain colorless and transparent silicic acid Sodium solution and filter residue, calculate the sodium silicate dissolution rate. Dilute the sodium silicate solution to 10Bé and place it in a 2L four-necked flask. When the water bath is heated to 80°C, CO 2...

Embodiment 2

[0025] Take by weighing 100g waste residue 2, 45g quartz sand mix, make SiO 2 The total content is 90.4%, Al 2 o 3 The content is 5%, then according to SiO 2 :Na 2 O molar ratio = 1:0.43 Add 99.1g of sodium carbonate, mix and grind into a powder mixture of about 100μm with a ball mill. Weigh 100 g of the mixed sample and put it into a rotary furnace, set the temperature at 820° C. for 3 hours, and obtain coarse sodium silicate solid particles after the reaction is completed. Put the above crude sodium silicate particles in a 1L autoclave, add 250mL of distilled water according to the solid-to-liquid ratio of 1:3, heat up to 200°C, stir and dissolve for 3 hours, then cool down to room temperature, filter and separate to obtain colorless and transparent silicic acid Sodium solution and filter residue, calculate the sodium silicate dissolution rate. Dilute the sodium silicate solution to 10Bé and place it in a 2L four-necked flask. When the water bath is heated to 80°C, CO ...

Embodiment 3

[0029] Weigh 100g waste residue 3, according to SiO 2 :Na 2O molar ratio = 1:0.43 Add 70g of sodium carbonate, mix and grind into a powder mixture of about 100μm with a ball mill. Weigh 100 g of the mixed sample and put it into a rotary furnace, set the temperature at 820° C. for 3 hours, and obtain coarse sodium silicate solid particles after the reaction is completed. Put the above crude sodium silicate particles in a 1L autoclave, add 250mL of distilled water according to the solid-to-liquid ratio of 1:3, heat up to 200°C, stir and dissolve for 3 hours, then cool down to room temperature, and filter to obtain colorless and transparent silicic acid Sodium solution and filter residue, calculate the sodium silicate dissolution rate. Dilute the sodium silicate solution to 10Bé and place it in a 2L four-necked flask. When the water bath is heated to 80°C, CO 2 . Keep the constant temperature when the temperature reaches 90°C, stop the reaction when the pH of the solution dro...

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Abstract

The invention relates to a method for preparing silica through coal gangue aluminum extraction waste slag. The method comprises the following steps: firstly, mixing the coal gangue aluminum extraction waste slag with quartz sand while enabling the SiO2 content of the mixture to be larger than or equal to 90% and the Al2O3 content of the mixture to be smaller than 6%; then according to the molar ratio of 1: (0.3-1) of SiO2 to sodium carbonate, adding the sodium carbonate to the mixture; grinding the mixture into particles with diameters of 50-200 [mu]m; placing the particles in a converter at 750-830 DEG C for fusing reaction for 1-5 hours, so as to obtain coarse sodium silicate particles; dissolving the coarse sodium silicate particles in a high-pressure reaction kettle to obtain a sodium silicate solution; diluting the sodium silicate solution to 5-15 baume degrees; leading CO2 produced during the process of the fusing reaction to the diluted sodium silicate solution for carbonation, so as to obtain the silica. The solubility of the solid sodium silicate prepared according to the method can reach up to 90%. The silica conforms to the national standard; the oil absorption rate of the silica is larger than 3.1 ml / g. Through the adoption of the method, the comprehensive utilization rate of coal gangue is improved, CO2 produced during the process of the fusing reaction is eliminated by dissolving, and emission of three wastes is reduced.

Description

technical field [0001] The invention relates to the preparation of white carbon black, in particular to a method for preparing white carbon black by using coal gangue to extract aluminum waste residue. Background technique [0002] When coal gangue, kaolin and fly ash are used as raw materials to prepare aluminum-based products such as polyaluminum chloride or crystalline aluminum chloride, a large amount of waste residue will be produced, and the silicon dioxide content in the waste residue is 60-90%. Utilization will inevitably lead to waste of raw materials and secondary environmental pollution. So far, many coal-based solid waste aluminum extraction technologies have been difficult to achieve industrialization due to high material consumption and energy consumption, large discharge of waste liquid and residue, serious secondary pollution, and low added value of products. Therefore, the preparation of high-value products such as sodium silicate or white carbon black usin...

Claims

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Application Information

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IPC IPC(8): C01B33/12B09B3/00
Inventor 程芳琴方莉陈荣明薛芳斌段晓芳孙岩
Owner SHANXI UNIV
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