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Method for preparing high-A113 content high-concentration polymerized aluminum water solution and device thereof

A preparation device and high-concentration technology, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of unstable product quality in the neutralization method, complex electrodialysis process, and long time consumption, and achieve easy control of process parameters and flocculation The effect of good effect and short reaction time

Inactive Publication Date: 2008-09-17
UNIV OF SCI & TECH BEIJING
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  • Claims
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages of too long time-consuming, low efficiency, complex electrodialysis process and unstable product quality of neutralization method by micro-dropping alkali or slowly adding alkali

Method used

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  • Method for preparing high-A113 content high-concentration polymerized aluminum water solution and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: AlCl 3 Prepare a solution with a concentration of 0.5mol / L and a concentration of NaOH of 0.5mol / L, the molar ratio of NaOH to aluminum trichloride is 0.2:1, the reaction temperature is 50°C, the mixing pressure difference is 0.01Mpa, and the ultrasonic intensity is 0.5W / cm2 , the reaction time is 1.5 hours, and the aging time is 5 hours. Aged product Al 13 Content 81%. The industrial sewage of a refinery, the water quality before treatment is: oil 110mg / l, COD 1011mg / l, the above-mentioned flocculant is pumped into the air flotation device, and the addition amount is 30mg / l. The water quality after treatment is 430mg / l COD, 56% removal rate, 31mg / l oil, 72% removal rate. And with commercially available polyaluminum (Al 2 o 3 Content 28%) 30mg / l after treatment, the COD removal rate is only 26%, and the oil removal rate is 36%.

Embodiment 2

[0016] AlCl 3 Prepare a solution with a concentration of 3mol / L and a concentration of NaOH of 5mol / L, the molar ratio of NaOH to aluminum trichloride is 3:1, the reaction temperature is 95°C, the mixing pressure difference is 0.1Mpa, the ultrasonic intensity is 5W / cm2, and the reaction time 10 hours, aging time 24 hours. Aged product Al 13 Content 76%.

[0017] Use this product to treat the oily sewage discharged from the electric desalination device of a refinery. Before treatment, the oil is 510mg / l, COD3210mg / l, suspended matter 330mg / l, and the pump is added to the drainage pipeline, and the amount is 30mg / l. After the sedimentation and separation device, The water quality after treatment is: oil 28mg / l, removal rate 94%, COD 530mg / l, removal rate 80%, suspended matter 18mg / l, removal rate 94.6%.

[0018] This product is used to treat circulating water in a steel mill. Before the treatment, the light transmittance of the circulating water is 30%. Add 30mg / l to implemen...

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Abstract

The invention relates to a preparation method of polyaluminum chloride with high All3 content and high concentration, belonging to the technology field of production and application of high efficiency water treatment flocculating agent. The method comprises the steps of preparing 0.5-3 mol / L AlCl3 solution and 0.5-5 mol / L NaOH solution according to the product preparation requirements, mixing NaOH solution and AlCl3 solution at a molar ratio of 0.2-3.5, reacting at 40-100 DEG for 1-10 hours, and aging for 5-24 hours to obtain polyaluminum chloride aqueous solution. The inventive method has the advantages of easily controlled process parameters, short reaction time, high product concentration, and good flocculation effect; and is suitable for treatment of various severely polluted industrial wastewater and domestic sewage. The content of the effective flocculation component Al13 can reach 70-82%. The flocculation test shows that the polyaluminum chloride obtained by using the inventive method has flocculation effect superior to commercial polyaluminum chloride, and use amount lower than conventional polyaluminum chloride.

Description

Technical field: [0001] The invention belongs to the field of environmental protection, and particularly relates to a preparation method and device for a high-Al13-content and high-concentration polymerized aluminum aqueous solution, which is suitable for the treatment of various industrial waste water and domestic sewage with serious pollution. Background technique: [0002] In wastewater treatment, coagulation technology is one of the most widely used technologies. Coagulants are the key to coagulation technology. According to their chemical properties, they can be roughly divided into two categories, namely inorganic and organic coagulants. Due to the toxicity problem of organic polymer flocculant, and the price is high. Inorganic coagulants have many advantages such as non-toxic (or low-toxic), cheap, and easy to obtain raw materials. They occupy an extremely important position in coagulation technology and have been widely used. Inorganic polymer flocculants develope...

Claims

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Application Information

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IPC IPC(8): C02F1/52
Inventor 娄世松范洪波
Owner UNIV OF SCI & TECH BEIJING
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