A method for treating polluted acid wastewater with modified red mud powder

A technology for polluted acid wastewater and red mud, which is applied in water/sludge/sewage treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc. Land and other issues, to achieve the effects of low raw material prices, easy reuse, and low processing costs

Active Publication Date: 2015-08-19
KUNMING METALLURGY INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of red mud cannot be fully and effectively utilized, and can only be stacked in a large area, occupying a large amount of land and causing serious pollution to the environment. Therefore, it is imminent to maximize the utilization of red mud resources
At present, the patents of using red mud to treat water mainly use red mud to prepare flocculants and adsorbents to remove one or two of phosphorus, arsenic, cadmium, fluorine, etc. Low-concentration phosphorus flocculant (CN101665279), a composite water treatment phosphorus removal flocculant (CN101665278), a preparation and application method of a mud-type iron-based red mud arsenic removal agent (CN102115225A), a red mud phosphorus removal flocculation preparation method (CN102115234A), preparation and application method of aluminum modified red mud defluorination adsorbent (CN101898128A), application method of iron modified red mud arsenic removal adsorbent (CN101176840), seawater flushing red mud arsenic removal adsorbent application methods (CN101205088), etc., but there are no relevant reports on the use of red mud to treat various major pollutants in sewage acid wastewater
Red mud contains a large amount of active metal oxide components such as iron, aluminum, silicon, and calcium. It is the most basic raw material for the preparation of flocculants and adsorbents, but it has not been effectively utilized so far, resulting in secondary waste of renewable resources.

Method used

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  • A method for treating polluted acid wastewater with modified red mud powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 5000mL of polluted acid wastewater produced in the process of lead smelting and put it in a plastic bucket. After 24 hours of static precipitation, take the supernatant for testing. The test results: pH is 0.65, arsenic is 26.5 mg / L, mercury is 1.34 mg / L L, cadmium is 5.51 mg / L, lead is 11.6 mg / L, zinc is 47 mg / L, and fluoride ion is 759 mg / L. Take 200ml of the supernatant and put it in a 500ml Erlenmeyer flask, neutralize it with milk of lime to pH 7.0, precipitate to remove some harmful substances such as arsenic, cadmium, lead, zinc and fluorine, and then add 1.5g of modified red mud powder, Stirring at 180r / min at 30°C for 2.5 hours, sedimentation for 30 minutes and centrifugation, the pH value of the water was 7.6, and the concentrations of arsenic, mercury, cadmium, lead, zinc and fluorine were 0.21 mg / L, 0.02 mg / L, 0.03 mg / L, respectively. L, 0.28 mg / L, 1.24 mg / L and 7.45 mg / L, which are lower than the discharge concentration limit of water pollutants for ne...

Embodiment 2

[0026] Get 5000mL of dirty acid waste water produced in the lead smelting process and place it in a plastic bucket, let it settle for 24 hours, get the supernatant and test it, the test result is the same as in Example 1. Take 200ml of the supernatant and put it in a 500ml Erlenmeyer flask, neutralize it with milk of lime to pH 7.0, precipitate to remove some harmful substances such as arsenic, cadmium, lead, zinc and fluorine, and then add 2.6g of modified red mud powder, Stirring at 180r / min at 30°C for 2.5 hours, sedimentation for 60min and centrifugation, the pH value of the water was 7.9, and the concentrations of arsenic, mercury, cadmium, lead, zinc and fluorine were 0.035mg / L, 0.0007mg / L and 0.006mg / L respectively. L, 0.12mg / L, 0.28mg / L and 1.6mg / L, which are lower than the most stringent standard values ​​of GB 5084-2005 control items in Table 1. After the sewage acid wastewater is treated by the lime neutralization method, the total hardness (calculated as calcium ca...

Embodiment 3

[0028]Take 5000mL of polluted acid waste water produced in the process of copper smelting, put it in a plastic bucket, let it settle for 24 hours, and take the supernatant for testing. The test results: pH is 0.76, arsenic is 31.2 mg / L, mercury is 0.83 mg / L L, cadmium is 4.36mg / L, lead is 7.5mg / L, zinc is 27.4mg / L, and fluoride ion is 587mg / L. Take 200ml of the supernatant and put it in a 500ml Erlenmeyer flask, neutralize it with milk of lime to pH 7.0, precipitate to remove some harmful substances such as arsenic, cadmium, lead, zinc and fluorine, and then add 1.4g of modified red mud powder, Stirring at 180r / min at 30°C for 2.5 hours, sedimentation for 30 minutes and centrifugation, the pH value of the water was 7.5, and the concentrations of arsenic, mercury, cadmium, lead, zinc and fluorine were 0.32mg / L, 0.02mg / L, 0.03mg / L respectively L, 0.23mg / L, 0.76mg / L and 4.16mg / L, which are lower than the concentration limit of water pollutants discharged by new enterprises in GB ...

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Abstract

The invention discloses a method for processing acidic wastewater by using modified red mud powder. The method comprises the following steps of A, adding lime milk to adjust a pH value of the acidic wastewater to 6.5-7.5; B, adding the red mud powder into the acidic wastewater processed by the step A according to a mass ratio of the acidic wastewater to the red mud powder being 200:1.5-2.6 ml / g; stirring for 2-3 h at a temperature of 30 DEG C, standing and precipitating for 30-60 min; and separating a supernatant by centrifugation. The method takes full use of the most universal lime neutralization system for processing the acidic wastewater, without reconstruction. Raw materials are cheap; water quality has high adaptability; a process flow is short; preparation and operation of the red mud powder are simple; and processing cost is low, thereby meeting actual requirements of enterprises. Compared with a lime neutralization method, the method provided by the invention takes full use of the characteristics of the red mud residues, and reduces use amount of quick lime. Effluent has low hardness, and does not block pipes and valves or influence stable running of a system. A processing effect is good; and the processed water can be recycled easily. The red mud powder has the advantages of good sediment dehydration property, relatively high metal quality and easy recovery utilization.

Description

Technical field [0001] The present invention is the field of wastewater treatment technology, which involves a method of modified red mud powder to treat pollutant acid wastewater. Background technique [0002] The sealing process of refining flue gas such as copper, lead, zinc, and zinc will produce a large amount of pollutant wastewater, mainly containing pollutants such as sulfuric acid, arsenic, mercury, cadmium, lead, zinc, and fluorine.Compared with the wastewater produced by other processes such as copper, lead, zinc, etc., the composition of the wastewater of polluting acid is complicated, the pH is extremely low, and the contents of various heavy metals and fluorine are dozens of times higher, or even hundreds of times.The treatment of polluting acid wastewater has become an important environmental problem facing the metal smelting industry.Reprint in the treatment of polluting acid wastewater is a major problem facing environmental protection. There are no generally rec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
Inventor 杨勇栾景丽何艳明欧根能刘维维陶辉旺陈华君熊国焕张水南姜永利李啸寅
Owner KUNMING METALLURGY INST
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