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A kind of composite iron salt coagulant and its preparation method and application

A technology of coagulant and iron salt, which is applied in the field of water treatment, can solve the problems of low removal rate of chemical oxygen demand, complex organic components, and many refractory substances, so as to achieve less dosage of chemicals, faster settling speed, and better preparation The effect of simple process

Active Publication Date: 2018-04-10
CHANGZHOU WUJIN YOUBANG WATER PURIFICATION MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main characteristics of printing and dyeing wastewater are complex organic components, many refractory substances, high chroma, and large changes in water quality. For the treatment of decolorization and flocculation of papermaking, printing and dyeing, and textile wastewater, the technologies currently used include aluminum sulfate and polyferric sulfate for treatment. Commonly used flocculants are treated with polyaluminum chloride and ferric chloride. The above flocculants have strict requirements on the pH of wastewater, low flocculation efficiency, and low removal rate of chemical oxygen demand (COD).

Method used

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  • A kind of composite iron salt coagulant and its preparation method and application
  • A kind of composite iron salt coagulant and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0015] (1) 100 tons of iron-containing waste hydrochloric acid (HCl%=4.51%, Fe 2 o 3 =11.91%) into the reaction kettle, add 400kg of sodium chlorate, stir and react at room temperature for 1 hour; (2) add 10 tons of aluminum-containing sludge (Al 2 o 3 =12.66%), continue stirring and reacting at normal temperature for 1 hour until the aluminum-containing sludge is completely dissolved; (3) add 1000kg of silicic acid dropwise and continue to react for 1 hour, filter to obtain a composite iron salt coagulant.

Embodiment 2

[0017] (1) 100 tons of iron-containing waste hydrochloric acid (HCl%=4.51%, Fe 2 o 3 =11.91%) into the reaction kettle, add 1200kg of sodium chlorate, stirred and reacted at room temperature for 2 hours; (2) add 20 tons of aluminum-containing sludge (Al 2 o 3 =12.66%), continue stirring and reacting at normal temperature for 2 hours to all dissolve the aluminum-containing sludge; (3) add 2500kg of silicic acid dropwise and continue to react for 1 hour, filter to obtain a composite iron salt coagulant.

Embodiment 3

[0019] (1) 100 tons of iron-containing waste hydrochloric acid (HCl%=4.51%, Fe 2 o 3 =11.91%) into the reaction kettle, add 2000kg of sodium chlorate, stir and react at room temperature for 1 hour; (2) add 30 tons of aluminum-containing sludge (Al 2 o 3 =12.66%), continue to stir and react at normal temperature for 2 hours to all dissolve the aluminum-containing sludge; (3) add 5000kg of silicic acid dropwise and continue to react for 2 hours, filter to obtain a composite iron salt coagulant.

[0020] Composite coagulant effect evaluation that the present invention makes

[0021] The source of sewage is Wujiang Sanlian printing and dyeing front sewage, the appearance is light yellow and turbid, its COD is 683.1mg / L, and the turbidity is 189.3NTU. The same dosage of polyaluminum chloride (PAC) and polyaluminum sulfate (PAS) were used respectively Dilute it with the finished composite iron salt coagulant to 10% and add it into the sewage as a flocculant, and compare the COD a...

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PUM

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Abstract

The invention relates to a composite iron salt coagulating agent, which is prepared from the following components in parts by weight: 100 parts of iron-containing waste hydrochloric acid, 10 to 30 parts of aluminum-containing sludge, 1 to 5 parts of silicic acid and 0.4 to 2 parts of sodium chlorate. A preparation method comprises the following steps of adding the iron-containing waste hydrochloric acid into a reaction kettle, adding the sodium chlorate into the reaction kettle, and agitating an obtained mixture for reaction; adding the aluminum-containing sludge into the reaction kettle, and agitating a newly obtained mixture for reaction; dropwise adding the silicic acid into the reaction kettle, and agitating a finally obtained mixture for reaction, to obtain the composite iron salt coagulating agent. The composite iron salt coagulating agent has the beneficial effects that (1), the composite coagulating agent is simple in preparation process, wide in sources of raw materials and low in cost; (2), the product performance is stable, the dosage of an agent is less, and a flocculating constituent is compact and is further quick in sedimentation rate; (3), the composite iron salt coagulating agent has favorable decoloration performance and a higher COD (Chemical Oxygen Demand) removal rate, and is wider in pH (potential of hydrogen) serviceable range.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and relates to a composite iron salt coagulant and its preparation method and application. Background technique [0002] my country is a big country in textile printing and dyeing, and the textile printing and dyeing industry is a large discharge of industrial wastewater. The treatment of printing and dyeing wastewater has always been the focus and difficulty of my country's wastewater treatment research. The main characteristics of printing and dyeing wastewater are complex organic components, many refractory substances, high chroma, and large changes in water quality. For the treatment of decolorization and flocculation of papermaking, printing and dyeing, and textile wastewater, the technologies currently used include aluminum sulfate and polyferric sulfate for treatment. Commonly used flocculants are treated with polyaluminum chloride and ferric chloride. The above flocculants have st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F103/30
CPCC02F1/5236C02F2103/30
Inventor 沙嘉王桂玉蒋银峰朱芬
Owner CHANGZHOU WUJIN YOUBANG WATER PURIFICATION MATERIALS
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