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Method of preparing aluminum sulphate by utilizing fly ash

A technology of aluminum sulfate and fly ash, which is applied in the direction of aluminum sulfate and aluminum sulfur compounds, can solve the problems of hidden safety hazards of operators and environmental pollution, and achieve the effects of quality assurance and energy saving

Active Publication Date: 2011-06-29
SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method reported in the current data is to add fluoride to aid dissolution in the acid leaching reaction, so that silicon and fluorine can be combined to achieve the purpose of releasing alumina in it. However, harmful gases such as HF may be produced during the process of aiding dissolution. During the process, fluorine-containing waste liquid and waste residue will be discharged, which will not only pollute the environment, but also cause safety hazards to operators

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The composition of raw fly ash is: Al 2 o 3 : 41%, SiO 2 : 48%, Fe 2 o 3 : 3.3%, CaO: 3.3%, TiO 2 : 1.3%, MgO: 0.2%. The composition of the raw coal fly ash can also adopt other components and specific dosages, any conventional fly ash can be used, which cannot be used to limit the protection scope of the present invention.

[0027] The fly ash is mechanically activated with a vibrating mill, ground to 100 mesh, mixed with water at a ratio of 1:1 and placed in an acid-resistant high-pressure reactor, and concentrated sulfuric acid with an acid-ash weight ratio of 0.8:1 is placed in a tank connected to the reactor. In another pressure vessel, the reaction kettle and the high-pressure system of the pressure vessel are closed, then the concentrated sulfuric acid flows into the fly ash and mixes with water at a temperature of 172°C and a pressure of 0.32MPa for 6 hours. After the reaction cools down, solid-liquid separation is adopted to obtain basic aluminum sulfate ...

Embodiment 2

[0029] The raw material fly ash in Example 1 is mechanically activated with a vertical mill, ground to 300 mesh, mixed with water according to 1:1.5 and placed in an acid-resistant high-pressure reactor, and the acid-ash weight ratio is 0.7:1 Concentrated sulfuric acid Put it in another pressure-resistant container connected to the reaction kettle. After the high-pressure system of the reaction kettle and the pressure-resistant container is closed, the concentrated sulfuric acid flows into the fly ash and mixes with water. The temperature is 120 ° C, the pressure is 0.5 MPa, and the reaction is 8 hours. After the reaction cools down, the solid-liquid is separated, and the basic aluminum sulfate liquid is obtained by flocculation and sedimentation. After the reaction cools down, the solid-liquid separation residue is washed with hot water countercurrently to improve the recovery rate of aluminum. Adding a concentration of 50% sulfuric acid to adjust its basicity is 0.3, pH 3.5, ...

Embodiment 3

[0031] The raw material fly ash in Example 1 is mechanically activated with a planetary mill, ground to 800 mesh, mixed with water according to 1:0.5 and placed in an acid-resistant high-pressure reaction kettle, and concentrated sulfuric acid with a weight ratio of acid ash of 1.5:1 is placed In another pressure vessel connected to the reaction kettle, the reaction kettle and the pressure vessel high-pressure system are closed, then the concentrated sulfuric acid flows into the fly ash and mixes with water at a temperature of 230°C and a pressure of 0.11MPa for 4 hours. After the reaction cools down, the solid-liquid separation is carried out, and the basic aluminum sulfate liquid is obtained by pressure filtration. After the reaction cools down, the solid-liquid separation residue is washed with hot water countercurrently to improve the recovery rate of aluminum, and the sulfuric acid with a concentration of 98% is added to adjust its basicity. is 0.4, and the pH value is 4 t...

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Abstract

The invention relates to a method of preparing aluminum sulphate by utilizing industrial solid waste, in particular to a method of preparing aluminum sulphate by utilizing fly ash. The method comprises the following steps: mechanically activating the fly ash; mixing the mechanically activated fly ash with water according to a weight ratio of 1: 0.5-2.5; adding concentrated sulfuric acid at a weight ratio of 0.3-2.2 : 1 to the fly ash to a reaction kettle to generate basic aluminum sulphate at a temperature of 120 to 230 DEG C kept for 1-8h and a pressure of 0.11 to 0.50 MPa; cooling the basicaluminum sulphate after a reaction, separating solid and liquid, adding sulfuric acid to the basic aluminum sulphate liquid, adjusting the system to have the basicity of 0.1 to 0.4 and the pH value of3 to 4 and converting the basic aluminum sulphate liquid into an aluminum sulphate solution; and evaporating and concentrating the aluminum sulphate solution to 110 to 120 DEG C and cooling and crystallizing the aluminum sulphate solution to separate aluminum sulphate crystals.

Description

technical field [0001] The invention relates to a method for preparing aluminum sulfate by using industrial solid waste, in particular to a method for preparing aluminum sulfate by using fly ash. Background technique [0002] Fly ash is a solid waste from coal-fired power plants. At present, my country's annual discharge of fly ash is hundreds of millions of tons, and the total stockpiles of fly ash in my country are more than one billion tons. The discharge of a large amount of fly ash not only occupies a large amount of land, but also seriously pollutes the environment, causing double damage to ecology and the environment. Therefore, the comprehensive utilization of fly ash has great practical and long-term strategic significance. [0003] Aluminum sulfate can be used as a purifying agent for water sources, factory water or factory wastewater treatment, and paper sizing agent; it can be used for fire extinguishers, tannins for the production of aluminum compounds or whit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/74
Inventor 李来时周凤禄刘瑛瑛廖新勤
Owner SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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