A kind of polyaluminum chloride-chitosan composite flocculant and its preparation method and application

A polyaluminum chloride and composite flocculant technology, which is applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water treatment parameter control, etc., can solve problems such as occupation of large land, human health and ecological environment security threats. , to achieve the effect of avoiding pollution, low cost and reducing production cost

Active Publication Date: 2020-04-17
GLOBAL ELECTRONICS WENZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the processing method of aluminum ash is mainly stockpiling, which not only occupies a large amount of land, but also contains harmful substances (especially fluorine) in aluminum ash, which poses a serious threat to human health and ecological environment safety.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A preparation method of polyaluminum chloride-chitosan composite flocculant, comprising the steps of:

[0038] (1) Grinding and sieving the aluminum ash, mixing with water, ultrasonic treatment at 65°C and 520W for 16 minutes, separating solid and liquid, and drying to obtain pretreated aluminum ash;

[0039] (2) Mix the aluminum ash prepared in step (1) with water to obtain an aluminum ash suspension; add concentrated hydrochloric acid (37% by mass fraction) to the aluminum ash suspension, stir and react at 73°C for 2.2h, 50 Aging at ℃ for 40 hours to obtain polyaluminum chloride; wherein, the mass ratio of aluminum ash to water is 1:3, and the mass ratio of water to concentrated hydrochloric acid is 1.5:1;

[0040] (3) Chitosan is dissolved in acetic acid solution to obtain chitosan / acetic acid solution; wherein, in chitosan / acetic acid solution, the massfraction of acetic acid is 8%, and the massfraction of chitosan is 3%;

[0041] (4) the chitosan / acetic acid solut...

Embodiment 2

[0044] A preparation method of polyaluminum chloride-chitosan composite flocculant, comprising the steps of:

[0045] (1) Grinding and sieving the aluminum ash, mixing it with water, ultrasonically treating it at 40°C and 600W for 20 minutes, separating the solid and liquid, and drying to obtain the pretreated aluminum ash;

[0046] (2) Mix the aluminum ash prepared in step (1) with water to obtain an aluminum ash suspension; add concentrated hydrochloric acid (36% by mass fraction) to the aluminum ash suspension, stir and react at 60°C for 3h, and then react at 40°C Aging for 48 hours to obtain polyaluminum chloride; wherein, the mass ratio of aluminum ash to water is 1:2, and the mass ratio of water to concentrated hydrochloric acid is preferably 1:1;

[0047] (3) Chitosan is dissolved in acetic acid solution to obtain chitosan / acetic acid solution; wherein, in chitosan / acetic acid solution, the massfraction of acetic acid is 5%, and the massfraction of chitosan is 2%;

[0...

Embodiment 3

[0051] A preparation method of polyaluminum chloride-chitosan composite flocculant, comprising the steps of:

[0052] (1) Grinding and sieving the aluminum ash, mixing it with water, ultrasonically treating it at 70°C and 400W for 10 minutes, separating the solid and liquid, and drying to obtain the pretreated aluminum ash;

[0053] (2) Mix the aluminum ash prepared in step (1) with water to obtain an aluminum ash suspension; add concentrated hydrochloric acid (38% by mass) to the aluminum ash suspension, stir and react at 90°C for 1h, and then react at 60°C Aging for 36 hours to obtain polyaluminum chloride; wherein, the mass ratio of aluminum ash to water is 1:4, and the mass ratio of water to concentrated hydrochloric acid is preferably 2:1;

[0054] (3) Chitosan is dissolved in acetic acid solution to obtain chitosan / acetic acid solution; wherein, in chitosan / acetic acid solution, the massfraction of acetic acid is 10%, and the massfraction of chitosan is 5%;

[0055] (4)...

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Abstract

The invention belongs to the technical field of flocculant production and specifically relates to an aluminum polychlorid-chitosan composite flocculant, a preparation method and an application thereof. The preparation method for the aluminum polychlorid-chitosan composite flocculant comprises the following steps: grinding and sieving aluminum ash, removing impurities by washing and then mixing with water and concentrated hydrochloric acid, stirring, reacting and curing, thereby acquiring aluminum polychlorid; dropwise adding a chitosan / acetic acid solution into a sodium polyphosphate solution and then regulating the pH of the reaction system to 4-5; firstly reacting while quickly stirring and then reacting while slowly stirring, adding aluminum polychlorid after the reaction is ended, and stirring and reacting for 1-3h at 80-100 DEG C, thereby acquiring the aluminum polychlorid-chitosan composite flocculant. The preparation method is simple in operation, low in cost and suitable for industrial production. The aluminum ash is taken as the raw material for preparing the aluminum polychlorid; the waste is turned into wealth; the production cost is lowered; environmental pollution caused by the solid waste of the aluminum ash is avoided.

Description

technical field [0001] The invention belongs to the technical field of flocculant production, and in particular relates to a polyaluminum chloride-chitosan composite flocculant and its preparation method and application. Background technique [0002] Aluminum ash is produced in the production process of aluminum melting such as electrolysis of primary aluminum, casting aluminum products, aluminum alloy refining, etc. The composition of aluminum ash has obvious differences according to the composition of raw materials and processes, mainly based on Al 2 o 3 , metal aluminum, and a mixture of salt flux, etc. With Al 2 o 3 Contains 20% to 40%, Al contains 10% to 30%, Si, Mg, Fe oxides contain 7% to 15%, K, Na, Ca, Mg chlorides and a small amount of fluoride contain 15% to 30%, Part of the aluminum oxide and aluminum nitride is attached to the surface of the aluminum metal. By the end of 2015, China's output of electrolytic aluminum and alumina accounted for 54.5% and 48.8%...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F1/58C02F1/62C02F1/64
CPCC02F1/5236C02F1/5245C02F1/5263C02F1/58C02F1/62C02F1/64C02F2209/08C02F2209/11C02F2303/22
Inventor 孟青
Owner GLOBAL ELECTRONICS WENZHOU
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