Use of magnesium resources in serpentine to co 2 Methods for Mineralized Storage

A technology of serpentine and resource pairing, applied in the direction of magnesium carbonate, etc., can solve the problem of no leaching of serpentine and so on

Active Publication Date: 2021-07-06
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, there is no leaching of serpentine at the same time as Mg 2+ Storage of CO 2 According to relevant reports, how to realize low-cost serpentine has become a technical problem to be solved urgently

Method used

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  • Use of magnesium resources in serpentine to co <sub>2</sub> Methods for Mineralized Storage
  • Use of magnesium resources in serpentine to co <sub>2</sub> Methods for Mineralized Storage
  • Use of magnesium resources in serpentine to co <sub>2</sub> Methods for Mineralized Storage

Examples

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Embodiment 1

[0039] In this example, see figure 1 and figure 2 , a method of using magnesium resources in serpentine to CO 2 The method for carrying out mineralized storage comprises the following steps:

[0040] a. After the serpentine is crushed, ball milling is carried out, and the size of the particles is all passed through a 200-mesh sieve to obtain serpentine powder, and then the serpentine powder is calcined. The calcined treatment temperature is 500 ° C, and the calcined time is 180min, obtain calcined pre-activated serpentine powder; carry out cross-flow leaching of pretreated serpentine and sulfuric acid, the leaching conditions of pretreated serpentine and sulfuric acid:

[0041] The serpentine powder was added to the sulfuric acid solution for leaching reaction, the temperature was 50°C, the time was 250min, the solid-liquid mass-to-volume ratio of the pretreated serpentine and sulfuric acid was 0.1:10 (g / mL). The stirring speed of the mixed solution of serpentine and sulfu...

Embodiment 2

[0056] This embodiment is basically the same as Embodiment 1, especially in that:

[0057] In this embodiment, a kind of utilization of magnesium resources in serpentine to CO 2 The method for carrying out mineralized storage comprises the following steps:

[0058] a. After the serpentine is crushed, ball milling is carried out, and the size of the particles is all passed through a 100-mesh sieve to obtain serpentine powder, and then the serpentine powder is calcined. The calcined treatment temperature is 700 ° C, and the calcined time is 15min, obtain the serpentine powder of calcining pre-activation treatment; The serpentine after pretreatment and sulfuric acid are carried out cross-flow leaching, the leaching condition of pretreatment serpentine and sulfuric acid:

[0059] Serpentine powder was added to sulfuric acid solution for leaching reaction at a temperature of 100°C for 10 minutes. The stirring speed of the mixed solution of serpentine and sulfuric acid after treat...

Embodiment 3

[0063] This embodiment is basically the same as the previous embodiment, and the special features are:

[0064] In this embodiment, a kind of utilization of magnesium resources in serpentine to CO 2 The method for carrying out mineralized storage comprises the following steps:

[0065] a. This step is the same as in Embodiment 1;

[0066] b. dissolving the magnesium sulfate heptahydrate crystals obtained in the step a in water to obtain a magnesium sulfate solution, then adding the pretreated serpentine ore powder prepared in the step a to the magnesium sulfate solution, and inject CO into the magnesium sulfate solution 2 gas, controlling CO above the surface of the magnesium sulfate solution 2 The equilibrium pressure is 100Mpa, the temperature of the magnesium sulfate solution is controlled at 80°C, and the pH value is controlled in the range of 8-10 to ensure that Mg(HCO 3 ) 2 Formation, ball milling the mixed liquid system of magnesium sulfate and serpentine to accele...

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Abstract

The invention discloses a method of using magnesium resources in serpentine to treat CO 2 A method for mineralization storage, leaching Mg from serpentine and using serpentine and leached Mg to CO 2 Mineralized storage belongs to the fields of mining, metallurgy, chemical industry and environment. In the invention, the pretreated serpentine and sulfuric acid are subjected to cross-flow leaching, and the filtered leaching solution is subjected to crystallization treatment to obtain magnesium heptahydrate. The solution after filtering the crystals is returned to the reaction system for leaching serpentine for the first time. Dissolve magnesium heptahydrate crystals in water, add serpentine powder, and introduce CO 2 gas to prepare magnesium bicarbonate solution. Afterwards, magnesium bicarbonate solution is heated to obtain magnesium carbonate. Finally, the mineralization and sequestration of greenhouse gases by magnesium and the enrichment of metal nickel and iron will be realized.

Description

technical field [0001] The invention relates to a treatment method for leaching serpentine, in particular to a method for extracting magnesium from leaching serpentine, and also relates to a CO 2 The method of mineralization and storage is applied in the fields of mining, metallurgy and chemical industry, and environmental technology. Background technique [0002] The serpentine ore with huge reserves in my country, its chemical general formula can be expressed as Mg 6 Si 4 o 10 (OH) 8 The 1:1 layered structure of silicate minerals. 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. It is mainly distributed in Mangya area, Qilian county, Xiaobabao and Heicigou. The serpentine unit structure layer (crystal layer) is composed of a layer of silicon-oxygen tetrahedral sheets and a layer of magnesia octahedral sheets, and the octahedral gaps are filled with mag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/24
CPCC01F5/24
Inventor 朱萍李祖良钱光人王杨君
Owner SHANGHAI UNIV
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