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Method for preparing red iron oxide by utilizing materialized mud of malysite water treatment agent

A technology of iron oxide red and treatment agent, which is applied in the direction of oxidation treatment of sludge, iron oxide, iron oxide/iron hydroxide, etc., can solve the problems of pollution cost, low production cost, dry iron red, etc., and achieve considerable economic benefits , low corrosion effect

Active Publication Date: 2011-03-02
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem of pollution or high cost in the prior art itself, and provide a method of using sewage to treat waste, turning waste into treasure, and having low production cost using iron salt water treatment agent to prepare iron oxide from physical and chemical sludge red way
This invention can not only obtain dry iron red, but also solve the final disposal problem of physical and chemical sludge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In a textile printing and dyeing factory, the COD value of the influent water is 1000-1500mg / L, and the pH value of the wastewater is 9-11. Ferrous sulfate is added in such an amount that the concentration of ferrous sulfate in the sewage to be treated is 1000mg / L. Lime, control the pH value of the sewage to be treated to 7-8.5, after ferrous sulfate is added to the water, hydrolysis reaction occurs, and ferrous hydroxide floc precipitation is generated, and the electric double layer of the organic colloid in the water is compressed by adsorption and electric neutralization, and Adsorption and bridging function, the suspended organic pollutants and colloidal substances in the water are precipitated together. After the suspended solids or colloids in the water are precipitated, the water quality becomes clear, and part of the organic matter is removed, achieving the effect of physical and chemical sewage treatment. The supernatant flows into the subsequent wastewater. Pro...

Embodiment 2

[0022] In another textile printing and dyeing factory, the COD value of the incoming water is 700-1000mg / L, and the pH value of the wastewater is 9-11. Ferrous chloride is added in such an amount that the concentration of ferrous sulfate in the sewage to be treated is 500mg / L. Sodium carbonate is added to control the pH value of the flocculation reaction precipitation to 7-8.5. After ferrous chloride is added to the water, a hydrolysis reaction occurs to form ferrous hydroxide floc precipitation. The electric layer, and the adsorption bridging effect, precipitate the suspended organic pollutants and colloidal substances in the water together. After the suspended solids or colloids in the water are precipitated, the water quality becomes clear, and part of the organic matter is removed, achieving the effect of physical and chemical sewage treatment. The supernatant The liquid flows into the subsequent wastewater treatment process. The newly settled physicochemical sludge has a ...

Embodiment 3

[0027] In a paper mill, the COD value of the influent water is 600-800mg / L, the pH value of the wastewater is 7-9, and polyferric sulfate is added. Sodium, to control the PH value of the flocculation reaction precipitation is 7-8, after the polyferric sulfate is added to the water, a hydrolysis reaction occurs, and the iron hydroxide floc precipitation is generated, and the electric double layer of the organic colloid in the water is compressed by adsorption and electric neutralization, and adsorption The bridging effect precipitates the suspended organic pollutants and colloidal substances in the water together. After the suspended solids or colloids in the water are precipitated, the water quality becomes clear, and part of the organic matter is removed, achieving the effect of physical and chemical sewage treatment. The supernatant flows into the subsequent wastewater treatment. process. The newly settled physicochemical sludge has a very high water content, with a water co...

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PUM

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Abstract

The invention discloses a method for preparing red iron oxide by utilizing materialized mud of a malysite water treatment agent. The method includes the steps as follows: firstly, the materialized mudwhich is obtained after sewage is processed by the malysite water treatment agent is dehydrated until the water content thereof is lowered to 65 to 80 percent; and secondly, the dehydrated materialized mud is dried until the water content thereof is lowered to 5 to 30 percent and then is calcined to obtain the red iron oxide, and the calcination temperature is controlled to range from 600 to 900DEG C. The invention adopts the step of converting the ferrous materialized mud into the useful dry process red iron oxide, thereby solving the problem of the final treatment of the materialized mud in waste water treatment plants. Compared with the dry process red iron oxide prepared by using ferrous sulfate, the dry process red iron oxide prepared by the method does not generate sulfur dioxide and other substances which pollute the atmospheric environment, the utilized materialized mud does not need to be purchased, suppliers of the materialized mud can provide certain amount of money for the final treatment of the materialized mud, the produced red iron oxide can be sold, and therefore, the method can bring considerable economic benefit for users.

Description

technical field [0001] The invention relates to the utilization of physical and chemical sludge in sewage treatment, in particular to a method for preparing iron oxide red from the physical and chemical sludge of an iron salt water treatment agent; the prepared iron oxide red can be widely used in the fields of construction, ceramics, coatings and the like. Background technique [0002] Industrial fields such as textile printing and dyeing and papermaking industry all produce a large amount of wastewater. At present, wastewater is mainly treated by coagulation sedimentation treatment, which is a commonly used water treatment process. Because iron brine treatment agent has the advantages of low price and wide adaptability to pH value, it is widely used in the field of industrial wastewater treatment. The use of iron brine treatment agent produces a large amount of physical and chemical sludge, which has become a difficult problem for wastewater treatment plants. It often easi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/06C02F11/12C02F11/18C02F11/06
Inventor 汪晓军万小芳顾晓扬
Owner SOUTH CHINA UNIV OF TECH