A method for extracting magnesium from metallurgical wastewater

An extraction and waste water technology, applied in the field of magnesium extraction, can solve the problems of low single-stage extraction rate and total recovery rate of magnesium, inability to realize continuous feed extraction, limitation of magnesium ion extraction, etc., and achieve simple and feasible production process, extraction and reaction. The effect of short extraction time and fast extraction speed

Active Publication Date: 2020-03-31
CHONGQING THREE GORGES UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

At present, the extraction system composed of dinonylnaphthalenesulfonic acid still has slow extraction speed and long extraction time in the extraction process of magnesium ions, generally more than 40min, and continuous feeding extraction cannot be realized. The liquid time is long, and the single-stage extraction rate and total recovery rate of magnesium are low, resulting in the extraction system composed of dinonyl naphthalene sulfonic acid to the extraction of magnesium ions is limited in industrial production applications

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  • A method for extracting magnesium from metallurgical wastewater

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Effect test

Embodiment 1

[0019] The initial concentration of magnesium ions in wastewater is 19.81g·L -1 , the volume is 100ml, the extraction temperature is normal temperature (25°C), sulfonated kerosene is used as a dilution solvent, and the volume ratio of the compound extractant is dinonylnaphthalenesulfonic acid: diisooctyl phosphate: n-decyl alcohol=80:15:5, compound The amount of extractant is 200ml, the organic phase is composed of sulfonated kerosene and compound extractant in a volume ratio of 1.5:1, the amount of organic phase is 500ml, the ultrasonic extraction power is 100-300W, the ultrasonic frequency is 20-25KHZ, and the ultrasonic extraction time is selected at 4min, the depth of immersion of the horn is about 5mm, and the liquid separation time is 3min, the single-stage extraction rate of magnesium is 86.59%. The concentration of loaded magnesium in the extracted organic phase was 7.81g L -1 , at room temperature (25°C), using sulfuric acid as the stripping agent, the stripping agen...

Embodiment 2

[0021] The initial concentration of magnesium ions in wastewater is 20.59g L -1 , the volume is 100ml, the extraction temperature is normal temperature (20°C), sulfonated kerosene is used as the dilution solvent, and the volume ratio of the compound extractant is dinonylnaphthalenesulfonic acid: diisooctyl phosphate: n-decyl alcohol=80:15:5, compound The amount of extractant is 200ml, the organic phase is made of sulfonated kerosene and compound extractant in a volume ratio of 1:1, the amount of organic phase is 400ml, the ultrasonic extraction power is 100-300W, the ultrasonic frequency is 20-25KHZ, and the ultrasonic extraction time is selected at 4 minutes, the depth of immersion of the horn is about 5mm, and the liquid separation time is 5 minutes, the single-stage extraction rate of magnesium is 85.21%. The concentration of loaded magnesium in the extracted organic phase was 7.79g L -1 , at room temperature (20°C), using sulfuric acid as the stripping agent, the strippin...

Embodiment 3

[0023] The initial concentration of magnesium ions in wastewater is 20.81g L -1 , the volume is 100ml, the extraction temperature is normal temperature (23°C), sulfonated kerosene is used as the dilution solvent, and the volume ratio of the compound extractant is dinonylnaphthalenesulfonic acid: diisooctyl phosphate: n-decyl alcohol=80:15:5, compound The amount of extractant is 200ml, the organic phase is composed of sulfonated kerosene and composite extractant in a volume ratio of 0.5:1, the amount of organic phase is 300ml, the ultrasonic extraction power is 100-300W, the ultrasonic frequency is 20-25KHZ, and the ultrasonic extraction time is selected at 3min, the depth of immersion of the horn is about 5mm, and the liquid separation time is 4min, the single-stage extraction rate of magnesium is 83.27%. The concentration of loaded magnesium in the extracted organic phase was 7.76g L -1 , at room temperature (23°C), using sulfuric acid as the stripping agent, the stripping a...

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Abstract

The invention discloses a method for extracting magnesium from metallurgical waste water. According to the method, magnesium is prepared by the steps of performing an extracting process and performinga back-extracting process respectively by taking sulphonated kerosene as a diluting solvent, taking dinonyl naphthalene sulphonic acid, di(2-ethylhexyl)phosphate and n-decyl alcohol as composite extracting solvents and taking sulphuric acid as a back extracting agent; the method for extracting the magnesium from the metallurgical waste water disclosed by the invention has the characteristics thatthe production process is green, environmentally friendly and production-free, the production and operation cost is low and large-scale production is facilitated. The method for extracting the magnesium from the metallurgical waste water disclosed by the invention has the advantages that high extracting speed and short extracting and back-extracting time are achieved; the extracting process and the back-extracting process can be completed within 2 to 3 minutes respectively; the liquid separating time is short and only requires 3 to 5 minutes after the extracting and the back-extracting are ended; as the method disclosed by the invention has the advantages of high extracting speed and short time consumption, a continuous feeding extracting process can be realized; moreover, the single-stage extracting rate of the extracting process and the single-stage extracting rate of the back-extracting process of the method are high, and can be up to 86.59 percent and 96.31 percent respectively; aproduction process is simple and feasible, and popularization and application are facilitated.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for extracting magnesium from metallurgical wastewater. Background technique [0002] In recent years, the use of magnesium has been continuously expanding. Due to its advantages such as light weight, high specific strength and specific stiffness, and good damping and shock absorption, the amount of magnesium used in energy conservation and environmental protection, automobile manufacturing, aerospace, military and other fields has continued to increase. Many important ores contain magnesium. During the process of extracting useful elements, magnesium will be transferred to the liquid phase, resulting in a large amount of magnesium in the wastewater. Direct efflux will not only pollute the water body, but also cause a waste of magnesium resources. Therefore, magnesium in metallurgical wastewater must be recycled. Magnesium in metallurgical wastewater is ge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/26B01D11/04C02F103/16
Inventor 蒋德敏李廷真方荣美梁克中武凯李梦成孔婷婷
Owner CHONGQING THREE GORGES UNIV
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