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
CN105565456BActive Publication Date: 2018-04-10CHANGZHOU WUJIN YOUBANG WATER PURIFICATION MATERIALS
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
CHANGZHOU WUJIN YOUBANG WATER PURIFICATION MATERIALS
Publication Date
2018-04-10

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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