Multifunctional efficient decolorizing flocculant and preparation method thereof

A high-efficiency decolorizing flocculant and multi-functional technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water treatment parameter control, etc., can solve unsatisfactory treatment effect, poor COD reduction effect, and affect product appearance and other problems, to achieve the effect of reducing the cost of sewage treatment, fast flocculation speed, and improving the effect of sewage treatment

Active Publication Date: 2015-07-29
SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, activated carbon, polyacrylamide, polyiron, polyaluminum, etc. are widely used in China to decolorize and flocculate industrial wastewater. The treatment cost of the former two is relatively high, while the treatment effect of the latter two is not ideal.
In addition, traditional decolorizer products also have low solid content (generally about 50%), poor decolorization, flocculation, and COD reduction effects, and the applicable industry water treatment range is relatively narrow, and the product is whitened at low temperature in winter. Disadvantages such as the appearance of the product

Method used

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  • Multifunctional efficient decolorizing flocculant and preparation method thereof

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Effect test

Embodiment 1

[0030] Formula: formaldehyde (formaldehyde aqueous solution with a mass concentration of 37%): 15%; dicyandiamide: 12%; ammonium chloride: 28%; urea: 18%; inorganic salts: 27%.

[0031] Preparation method: Put 100 kg of formaldehyde (accounting for 2 / 3 of the total formaldehyde), 120 kg of dicyandiamide, and 180 kg of urea into a stainless steel reaction kettle equipped with a reflux condenser in sequence, stir and heat up to 40°C ± 2°C, stop Heating, adding 280 kg of ammonium chloride, after the exothermic peak of the reaction, add the remaining 50 kg of formaldehyde, control the temperature at 85 degrees ± 2 degrees for condensation reaction, keep warm for 3 hours, then add 90 kg of ferric chloride, polymerized chlorine 180 kg of aluminum, stirring for 30 minutes, made a new type of industrial wastewater treatment agent --- multifunctional high-efficiency decolorizing flocculant.

Embodiment 2

[0033] Formula: formaldehyde (formaldehyde aqueous solution with a mass concentration of 37%): 25%; dicyandiamide: 20%; ammonium chloride: 22%; urea: 13%; inorganic salts: 20%.

[0034] Preparation method: Put 150 kg of formaldehyde (accounting for 3 / 5 of the total formaldehyde), 200 kg of dicyandiamide, and 130 kg of urea into a stainless steel reaction kettle equipped with a reflux condenser in sequence, stir and heat up to 45 degrees ± 2 degrees, stop Heating, adding 220 kg of ammonium chloride, after the exothermic peak of the reaction, add the remaining 100 kg of formaldehyde, control the temperature at 80 °C ± 2 °C for condensation reaction, keep warm for 2 hours, then add 82.5 kg of ferric chloride, polymerized chlorine 105.5 kg of aluminum and 12 kg of silicon dioxide were stirred for 50 minutes to prepare a new type of industrial wastewater treatment agent---a multifunctional high-efficiency decolorizing flocculant.

Embodiment 3

[0036] Formula: formaldehyde (formaldehyde aqueous solution with a mass concentration of 37%): 18%; dicyandiamide: 14%; ammonium chloride: 24%; urea: 14%; inorganic salts: 30%.

[0037] Preparation method: Put 112 kg of formaldehyde (between 3 / 5 and 2 / 3 of the total formaldehyde), 140 kg of dicyandiamide, and 140 kg of urea into a stainless steel reaction kettle equipped with a reflux condenser in sequence, stir and heat up to 50 Temperature ± 2 degrees, stop heating, add 240 kg of ammonium chloride, after the peak of the exothermic reaction, add the remaining formaldehyde 68 kg, control the temperature at 90 degrees ± 2 degrees for condensation reaction, keep warm for 4 hours, and then add trichloride 100 kg of iron, 100 kg of ferrous sulfate, and 100 kg of polyaluminum chloride were stirred for 2 hours to prepare a new type of industrial wastewater treatment agent---a multifunctional high-efficiency decolorizing flocculant.

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Abstract

The invention discloses a multifunctional efficient decolorizing flocculant and a preparation method thereof. The decolorizing flocculant includes 15-25% of formaldehyde, 12-20% of dicyandiamide, 22-28% of ammonium chloride, 13-18% of urea and 20-30% of inorganic salt; and the inorganic salt is one or more selected from aluminum salt, iron salt and silicon salt. The preparation is as below: adding formaldehyde accounting for 3/5-2/3 of the total formaldehyde in a reactor, then adding urea and dicyandiamide in turn for dissolving, heating to 40+/-2 DEG C-50 +/-2 DEG C, and conducting a polymerization reaction; adding ammonium chloride and the remaining formaldehyde, controlling the temperature at 80+/-2 DEG C-90+/-2 DEG C, conducting a second polymerization, and insulating for 2-4 h; and adding inorganic salt and stirring uniformly to obtain the flocculant. The decolorization flocculant has the advantages of solid content of more than 55%, wide application, decolorization rate of more than 95%, high flocculation speed and COD removal rate reaching more than 65%, improves the process requiring repeated addition of different organic and inorganic flocculants in water treatment, and solves the problem of influence of different order of operations on wastewater treatment effects.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and relates to a novel industrial wastewater treatment agent, in particular to a multifunctional high-efficiency decolorizing flocculant and a preparation method thereof. Background technique [0002] At present, activated carbon, polyacrylamide, polyiron, polyaluminum, etc. are widely used in China for decolorization and flocculation treatment of industrial wastewater. The treatment cost of the former two is relatively high, while the treatment effect of the latter two is not ideal. In addition, traditional decolorizer products also have low solid content (generally about 50%), poor decolorization, flocculation, and COD reduction effects, and the applicable industry water treatment range is relatively narrow, and the product is whitened at low temperature in winter. Disadvantages such as the appearance of the product. Contents of the invention [0003] The purpose of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
CPCC02F1/52C02F2209/08
Inventor 胡波江友进
Owner SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH
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