Method for preparing polysilicate ferro-aluminum sulfate composite flocculant from red mud waste

A technology of polysilicon aluminum ferric sulfate and composite flocculant, which is applied in the fields of ferric sulfate, chemical instruments and methods, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of complex preparation process and high cost, and achieve simple process and low production cost Low, low residual aluminum content effect

Inactive Publication Date: 2018-05-29
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method of using red mud waste to prepare polysilicon aluminum ferric sulfate composite flocculant, so as to solve the defects of complex preparation process and high cost of using red mud waste to prepare flocculant

Method used

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  • Method for preparing polysilicate ferro-aluminum sulfate composite flocculant from red mud waste
  • Method for preparing polysilicate ferro-aluminum sulfate composite flocculant from red mud waste
  • Method for preparing polysilicate ferro-aluminum sulfate composite flocculant from red mud waste

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Embodiment 1

[0054] The method for preparing the polysilicon-aluminum-ferric-sulfate composite flocculant using red mud waste in this embodiment comprises the following steps:

[0055] (1) Put the red mud waste containing silicon, aluminum and iron and the activator sodium carbonate in a muffle furnace for calcination, the calcination temperature is 550°C, and the calcination time is 4.5h; then the red mud waste is ground and passed through 300 Mesh sieve to obtain activated red mud powder with a particle size of 48 μm; the quality of the activator sodium carbonate is 2% of the red mud waste quality;

[0056] (2) Put the activated red mud powder into a sulfuric acid solution with a mass fraction of 80% for reaction, add hydrogen peroxide to increase the leaching rate, the amount of hydrogen peroxide is 0.2% of the mass of red mud waste, the reaction temperature is 90°C, and the reaction time is 1.5h, The solid-to-liquid ratio is 8ml / g;

[0057] (3) Add calcium oxide and aluminum silicate ...

Embodiment 2

[0060] The method for preparing the polysilicon-aluminum-ferric-sulfate composite flocculant using red mud waste in this embodiment comprises the following steps:

[0061] (1) Put the red mud waste containing silicon, aluminum and iron and the activator sodium fluoride in a muffle furnace for calcination, the calcination temperature is 550°C, and the calcination time is 4.5h; 300 mesh sieves to obtain activated red mud powder with a particle size of 48 μm; the quality of the activator sodium fluoride is 2% of the red mud waste mass;

[0062] (2) Put the activated red mud powder into a sulfuric acid solution with a mass fraction of 80% for reaction, add hydrogen peroxide to increase the leaching rate, the amount of hydrogen peroxide is 0.2% of the mass of red mud waste, the reaction temperature is 90°C, and the reaction time is 1.5h, The solid-to-liquid ratio is 8ml / g;

[0063] (3) Add calcium oxide and aluminum silicate to the solution of step (2), adjust the molar ratio of F...

Embodiment 3

[0066] The method for preparing the polysilicon-aluminum-ferric-sulfate composite flocculant using red mud waste in this embodiment comprises the following steps:

[0067](1) Put the red mud waste containing silicon, aluminum and iron and the activator sodium fluoride in a muffle furnace for calcination, the calcination temperature is 550°C, and the calcination time is 4.5h; 300 mesh sieves to obtain activated red mud powder with a particle size of 48 μm; the quality of the activator sodium fluoride is 3% of the red mud waste mass;

[0068] (2) Put the activated red mud powder into a sulfuric acid solution with a mass fraction of 80% for reaction, add hydrogen peroxide to increase the leaching rate, the amount of hydrogen peroxide is 0.2% of the mass of red mud waste, the reaction temperature is 90°C, and the reaction time is 1.5h, The solid-to-liquid ratio is 8ml / g;

[0069] (3) Add calcium oxide and aluminum silicate to the solution of step (2), and adjust the molar ratio o...

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Abstract

The invention discloses a method for preparing a polysilicate ferro-aluminum sulfate composite flocculant from red mud waste. The method comprises the following steps: (1) putting red mud waste and anactivating agent into a muffle furnace to be roasted and grinding the red mud waste to obtain activated red mud powder; (2) putting an oxidizing agent and the activated red mud powder into a sulfuricacid solution to react; (3) adding adjusting salt to adjust a molar ratio of Fe to Al to Si in the solution as 1 to 1 to (0.2 to 0.7), utilizing a pH conditioning agent to adjust a pH of the solutionto 1 to 6; (4) adding a stabilizer to react and filtering to obtain the polysilicate ferro-aluminum sulfate composite flocculant. By means of the method disclosed by the invention, ferric oxide, aluminum oxide and silicon oxide in the red mud waste are effectively utilized to prepare the polysilicate ferro-aluminum sulfate composite flocculant; not only are the problems that the waste red mud occupies a lot of land and pollutes underground water are solved, but also the waste red mud can be resourcefully utilized, production cost is low, added value of products is high, and a novel way for comprehensively utilizing the red mud waste is provided.

Description

technical field [0001] The invention relates to the technical field of composite flocculants, in particular to a method for preparing polysilicon aluminum ferric sulfate composite flocculants by using red mud waste. Background technique [0002] Coagulation sedimentation method is an economical and simple water treatment method used to remove colloidal suspended solids in water in the field of water treatment engineering technology at home and abroad. It is widely used in oil and municipal sludge conditioning and other solid-liquid separation. The performance of flocculant determines the operating cost of water treatment and the quality effect of water purification. Therefore, new and efficient water treatment agents and materials play an important role in the field of water treatment technology and are the basis for the innovation and development of water pollution control engineering technology. [0003] At present, the types of flocculants mainly include inorganic, organ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/14C02F1/52
CPCC01G49/14C02F1/5236
Inventor 石太宏杨慧珠毛杉周雾
Owner SUN YAT SEN UNIV
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