Electrochemical in situ leaching of serpentine using membranes for simultaneous mg 2+ archive co 2 device and method

A membrane electrochemistry, serpentine technology, applied in the direction of electrolysis components, electrolysis process, etc., to achieve the effect of easy control and use, simple device structure, small footprint

Active Publication Date: 2020-10-16
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] However, there are no relevant reports on membrane electrochemical in-situ leaching of serpentine while Mg2+ sequesters CO2. How to realize low-cost serpentine has become an urgent technical problem to be solved.

Method used

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  • Electrochemical in situ leaching of serpentine using membranes for simultaneous mg <sup>2+</sup> archive co <sub>2</sub> device and method
  • Electrochemical in situ leaching of serpentine using membranes for simultaneous mg <sup>2+</sup> archive co <sub>2</sub> device and method
  • Electrochemical in situ leaching of serpentine using membranes for simultaneous mg <sup>2+</sup> archive co <sub>2</sub> device and method

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Effect test

Embodiment 1

[0050] In this example, see figure 1 , a membrane electrochemical in situ leaching of serpentine with simultaneous Mg 2+ Storage of CO 2 The device is characterized in that: an anion exchange membrane is used to divide the reaction tank into an anode area and a cathode area, and the anion exchange membrane used allows anion ions to pass through, while cations are blocked; the electrode in the anode area adopts a gas diffusion electrode, and the electrode in the cathode area Made of any one of stainless steel and graphite or a composite of the two;

[0051] According to the ratio of solid-liquid mass to volume in the range of 0.1:10 (g / mL) to 1:1 (g / mL), put the pre-activated serpentine with a particle size of 60-200 mesh into the anode area of ​​membrane electrochemistry In the acidic system solution, the serpentine-acidic solution mixed system solution is formed. After the reaction starts, the following membrane electrochemical reactions will occur in the two poles:

[005...

Embodiment 2

[0071] This embodiment is basically the same as Embodiment 1, especially in that:

[0072] In this example, a membrane electrochemical in situ leaching of serpentine while Mg 2+ Storage of CO 2 method, including the following steps:

[0073] According to the ratio of solid-liquid mass to volume ratio of 1:1 (g / mL), the pre-activated serpentine with a particle size of 60 mesh is put into the anode tank solution in the anode area of ​​membrane electrochemistry for reaction, and the reaction temperature is controlled. The temperature is 10°C, the reaction time is 500min, and an anode tank solution containing serpentine is formed, and the stirring speed of the anode tank solution is 100rpm;

[0074] H through the anode diffusion electrode 2 The flow rate is controlled from 1sccm to 1000sccm, the cell voltage is controlled at 1V, and the current density is controlled at 1A / cm 2 ;Put the porous inorganic membrane on both sides of the anion exchange mold, so as to avoid the anion...

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Abstract

The invention discloses a device and a method for using membrane electrochemical in-situ leaching of serpentine while Mg < 2 + > for capturing and storing CO2. The method for using the membrane electrochemical in-situ leaching of the serpentine while the Mg < 2 + > for capturing and storing the CO2 is provided, an electrochemical reaction tank separated by an anion exchange membrane is adopted, agas diffusion electrode is adopted as the anode, and stainless steel or graphite is adopted as the cathode; the reaction comprises the following steps that in the anode region, H2 forms protons H < +> at a gas diffusion electrode, and an acid system of the anode region is used for leaching the serpentine; in an electrode region, the H2 reacted in the anode is transferred to the anode region, andan alkaline system OH <-> is formed in the cathode region; the leaching rate of the serpentine in the anode region reaches 95%, and the purity of MgCO3 obtained in the cathode region reaches 98.5% orabove. According to the method for using electrochemical in-situ leaching of the serpentine while the Mg < 2 + > for capturing and storing the CO2, synchronous comprehensive utilization of two kinds of natural resources is realized, meanwhile, the greenhouse gas CO2 is mineralized, captured and stored, so that the double-purpose effect is achieved.

Description

technical field [0001] The present invention relates to a treatment method and process device for leaching serpentine, in particular to a method and process device for extracting magnesium from leaching serpentine and also relates to a CO 2 The method for mineralization and storage also relates to a method for utilizing serpentine, which is applied in the fields of mining, metallurgy, chemical industry and environmental technology. Background technique [0002] my country has huge reserves of serpentine ore, and its general chemical formula can be expressed as Mg 6 Si 4 o 10 (OH) 8 , is a 1:1 layered silicate mineral. Its chemical composition is shown in Table 1, the main components are magnesium oxide and silicon dioxide, and its mass accounts for about 80% of the serpentine ore. Mainly distributed in Jiangxi, Anhui, Qinghai and other provinces. The serpentine unit structure layer (crystal layer) is composed of a layer of silicon-oxygen tetrahedral sheets and a layer ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/04C22B26/22C25B1/18
CPCC22B3/045C22B26/22C25B1/18
Inventor 朱萍李祖良钱光人王杨君
Owner SHANGHAI UNIV
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