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Process method for preparing metal refined magnesium from dolomite

A process method, dolomite technology, applied in the direction of magnesium oxide, etc., can solve problems such as chlorine gas environmental pollution, and achieve the effects of high product purity, low production cost, and smooth process

Inactive Publication Date: 2013-11-27
内蒙古昶泰资源循环再生利用科技开发有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a process for preparing refined magnesium from dolomite. The method first prepares a high-purity magnesium oxide intermediate product by calcination-carbonization, and then produces magnesium metal by electrolytic magnesium oxide, which avoids the use of The traditional thermal reduction method also solves the serious pollution problem of chlorine gas produced by the molten salt electrolysis method to the environment

Method used

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  • Process method for preparing metal refined magnesium from dolomite
  • Process method for preparing metal refined magnesium from dolomite
  • Process method for preparing metal refined magnesium from dolomite

Examples

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Embodiment 1

[0038] Embodiment 1: The chemical composition of dolomite is MgO content 20.96%, CaO content 30.06%, broken to 2cm~5cm. Calcined at 900°C for 3h to obtain calcined white. The calcined white is mixed according to the mass ratio of water: calcined white of 50:1, heated and stirred to 60° C., and incubated for 1 hour to obtain an emulsion. The emulsion is passed through a 60-mesh sieve to obtain refined magnesium emulsion. After cooling to room temperature, CO 2 , CO 2 The flow rate is 0.5L / min, and the pH value of the carbonization system is tracked and tested. When the carbonization system is at pH=8.5, ammonium oxalate is added to make the concentration of oxalate in the system 0.002mol / L, and carbonization is continued until pH=6.5 to stop carbonization. The carbonized system is separated from solid to liquid, the solid phase is light calcium carbonate, and the liquid phase is heavy magnesium water. The obtained heavy magnesium water is pyrolyzed at 95°C for 2 hours, sol...

Embodiment 2

[0039] Example 2: The composition of dolomite is MgO content 20.96%, CaO content 30.06%, broken to 2cm-5cm. Calcined at 950°C for 2.5h to obtain calcined white. The calcined white is mixed according to the mass ratio of water: calcined white of 40:1, stirred and heated to 70° C., and digested with heat for 1.5 hours to obtain an emulsion. The emulsion is passed through a 60-mesh sieve to obtain refined magnesium emulsion. After cooling to room temperature, CO 2 , CO 2 The flow rate is 0.8L / min, and the pH value of the carbonization system is tracked and tested. When the carbonization system is at pH=9.0, add oxalic acid to make the concentration of oxalate in the system 0.005mol / L, continue carbonization to pH=6.8, and stop carbonization. The carbonized system is separated from solid to liquid, the solid phase is light calcium carbonate, and the liquid phase is heavy magnesium water. The obtained heavy magnesium water is pyrolyzed at 100°C for 2 hours, solid-liquid separa...

Embodiment 3

[0040] Example 3: The composition of dolomite is MgO content 20.96%, CaO content 30.06%, broken to 2cm-5cm. Calcined at 1000°C for 2 hours to obtain calcined white. The calcined white was mixed according to water: calcined white = 60:1, stirred and heated to 70°C, and kept for 2 hours to obtain an emulsion. The emulsion is passed through a 60-mesh sieve to obtain refined magnesium emulsion. After cooling to room temperature, CO 2 , CO 2 The flow rate is 1L / min, and the pH value of the carbonization system is tracked and tested. When the carbonization system is at pH=9.0, add oxalic acid so that the concentration of oxalate in the system is 0.008mol / L, continue carbonization to pH=6.5, and stop carbonization. The carbonized system is separated from solid to liquid, the solid phase is light calcium carbonate, and the liquid phase is heavy magnesium water. The obtained heavy magnesium water is pyrolyzed at 100°C for 2 hours, solid-liquid separation after cooling, and the sol...

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Abstract

The invention discloses a process method for preparing metal refined magnesium from dolomite. The process method comprises the following steps of: performing crushing, calcination, digestion, filtration, carbonization of a magnesium emulsion, solid-liquid separation, heavy magnesium water pyrolysis, drying and calcination of basic magnesium carbonate and high-purity magnesium oxide electrolysis on dolomite to prepare the metal refined magnesium with the purity being above 99%, which is fully in line with the technical requirements of GB / T 3499-2003 'primary magnesium ingot' on magnesium ingots with grades of Mg9980-Mg9995. The invention provides a process technology for producing the metal refined magnesium from the dolomite by calcination-carbonization-electrolysis, and a certain quantity of oxalic acid or soluble oxalate is added into a carbonization system, so that a high-purity magnesium oxide intermediate product can be obtained and the target of finally obtaining the high-purity electrolysis metal refined magnesium can be reached. The process method disclosed by the invention has the advantages of smooth process, easiness in implementation of industrial production, high extraction rate of metal magnesium and stable product quality.

Description

technical field [0001] The invention relates to metal smelting technology, in particular to a process for preparing metal refined magnesium from dolomite. Background technique [0002] Magnesium is a light, ductile and very active metal, which is widely used in the automotive industry, 3C industry, aerospace and military industries. At present, the smelting methods of metal magnesium are mainly divided into two types: one is thermal reduction method, including ferrosilicon thermal reduction method (Pidgeon method), thermite reduction method and aluminum-silicon alloy thermal reduction method, etc.; the other is molten salt electrolysis method. The current commonly used process method in my country is the thermal reduction method, which is to calcinate magnesite or dolomite under high temperature conditions, use ferrosilicon alloy, aluminum, aluminum-silicon alloy or aluminum-magnesium alloy as the reducing agent, in a certain vacuum and Under high temperature, the magnesite ...

Claims

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Application Information

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IPC IPC(8): C01F5/02C25C3/04
Inventor 余红发武金永郑利娜麻海燕
Owner 内蒙古昶泰资源循环再生利用科技开发有限责任公司
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