CN-121976057-A - Vacuum reduction preparation method of non-electrolytic aluminum

Abstract

The invention belongs to the technical field of aluminum industry, and provides a vacuum reduction preparation method of electroless aluminum, which comprises the following steps of placing high-purity aluminum oxide into a vacuum metallurgy reduction furnace, vacuumizing, heating to 1600-2000 ℃, adding metal magnesium, reducing aluminum oxide at high temperature to generate metal aluminum, and combining the metal magnesium with oxygen in a reaction system to generate magnesium oxide. The invention subverts the metallurgical process logic of the traditional electrolytic aluminum for century, breaks through the bottleneck of the global electroless aluminum production laboratory, initiates the electroless vacuum high-temperature reduction technology, thoroughly cuts off the strong electricity consumption of the electrolytic process by utilizing the aluminum oxide and magnesium to produce aluminum, realizes the magnitude reduction of electricity consumption and carbon emission, fills the blank of the global electroless aluminum production industrialization technology, provides the bottom technical support for the aluminum industry upgrading, and has the technical content and the industrial innovation value at the global leading level.

Inventors

• WANG QINGMING
• WANG YONGZHI

Assignees

• 湖北省沪锌材料有限公司

Dates

Publication Date

20260505

Application Date

20260311

Claims (6)

1. 1. A vacuum reduction preparation method of non-electrolytic aluminum is characterized by comprising the following steps of placing industrial ultra-high purity aluminum oxide in an industrial vacuum metallurgy reduction furnace, vacuumizing and heating to 1600-2000 ℃ in an industrial metallurgy high-temperature zone, adding metal magnesium according to the mass ratio of aluminum oxide to metal magnesium of 100:10-30, reducing the aluminum oxide to generate metal aluminum by vacuum high-temperature reduction, and combining the metal magnesium with oxygen in a reaction system to generate magnesium oxide.
2. 2. The method for preparing electroless aluminum by vacuum reduction according to claim 1, wherein industrial grade potassium chloride is added as a flux in an amount of 0.01 to 2% by mass of alumina to the vacuum metallurgical reduction furnace before heating.
3. 3. The method for preparing the non-electrolytic aluminum by vacuum reduction according to claim 1, wherein the temperature is raised to 1600 ℃ or 2000 ℃ after vacuumizing, and a sectional precise temperature control process is adopted, so that the temperature control error is 5 ℃.
4. 4. The method for preparing the electroless aluminum by vacuum reduction according to claim 1, wherein the method is characterized in that the sufficiency of the reduction reaction is ensured by adopting a dynamic heat preservation and temperature control process after feeding magnesium metal, and the reaction end point is judged by a system component on-line detection technology.
5. 5. The method for preparing the electroless aluminum by vacuum reduction according to claim 1, wherein the magnesium oxide waste residue is taken, the temperature is regulated and controlled to 1050-1150 ℃ in a metallurgical vacuum environment, industrial grade high-purity metal aluminum is added, and the metal aluminum and the magnesium oxide are subjected to thermit reduction reaction to generate the magnesium aluminum intermediate alloy.
6. 6. The method for preparing the non-electrolytic aluminum by vacuum reduction according to claim 1, wherein the carbon aluminum intermediate alloy is added into the magnesium aluminum intermediate alloy, the carbon aluminum intermediate alloy and the magnesium aluminum intermediate alloy are fully mixed by a homogenizing melting process under a vacuum high-temperature environment of 1050-1150 ℃, and then are cooled and discharged by a gradient cooling process to prepare the industrial grade aluminum magnesium alloy.

Description

Vacuum reduction preparation method of non-electrolytic aluminum Technical Field The invention belongs to the technical field of metallurgy in aluminum industry, and particularly relates to a vacuum reduction preparation method of electroless aluminum. Background The current global industrial production of metal aluminum depends on the traditional electrolytic method, the electrolytic aluminum production process has the following fatal defects that firstly, the energy consumption bottleneck cannot break through, the power consumption of electrolytic aluminum is determined by the electrolytic reaction mechanism, 13000 kWh/ton is the lower limit of the industry theory and cannot be reduced through process optimization, the global energy consumption red line of each country is reached, the expansion of the productivity is comprehensively limited, secondly, the non-electrolytic aluminum production process falls into the laboratory dilemma that the research of the non-electrolytic aluminum production in the global scope stays in the small test/pilot test stage, the core problems of low reduction efficiency, difficult vacuum/temperature coupling control and industrial mass production cannot be solved, and no any available industrial technical scheme exists. In summary, development of a brand new industrial process for preparing aluminum by electroless process is needed to break through the bottleneck of the prior art and realize energy conservation and carbon reduction and industrial upgrading of the aluminum industry. Disclosure of Invention The invention aims to provide a vacuum reduction preparation method of electroless aluminum, which overcomes the defects, overturns the century metallurgical process logic of the traditional electrolytic aluminum, breaks through the bottleneck of the global laboratory industry for producing the electroless aluminum, and realizes the industrialized preparation of aluminum by utilizing aluminum oxide and magnesium. The technical aim of the invention is achieved by the following technical scheme that the vacuum reduction preparation method of the electroless aluminum comprises the following steps of placing industrial ultra-high purity aluminum oxide in an industrial vacuum metallurgy reduction furnace, vacuumizing and heating to 1600-2000 ℃ in an industrial metallurgy high-temperature zone, adding metal magnesium according to the mass ratio of the aluminum oxide to the metal magnesium of 100:10-30, generating metal aluminum by vacuum high-temperature reduction of the aluminum oxide, and combining the metal magnesium with oxygen in a reaction system to generate magnesium oxide. By adopting the technical scheme, the industrial-grade metallurgical vacuum environment is coupled with high temperature of 1600-2000 ℃, the core problems that the reduction efficiency of the traditional electroless aluminum production is low and industrialization cannot be realized are solved, the synchronous reaction accompanied by aluminum oxide reduction to aluminum and magnesium oxide is realized by precisely adding magnesium element in a reduction system and utilizing the high chemical activity of magnesium, the technological thinking of the traditional single reduction of metal aluminum is broken, a natural magnesium source is provided for the subsequent thermite secondary reduction, and the method belongs to the innovative application of metallurgical reaction mechanism. The invention is different from the low vacuum/medium temperature non-electrolytic reduction in the laboratory stage, the invention clearly defines the industrial parameters of the accurate temperature control of the vacuum degree +2000 ℃ of the industrial-grade metallurgy, realizes the industrialization standard of the reduction efficiency of the alumina, and is a breakthrough from the laboratory technology to the quality of industrial application. The invention is further provided that industrial grade potassium chloride is added into the vacuum metallurgy reduction furnace as a flux before temperature rising. The invention is further provided that the temperature is raised to 1600 ℃ or 2000 ℃ after vacuumizing, and a sectional type precise temperature control process is adopted, so that the temperature control error is 5 ℃. The invention is further provided that a dynamic heat preservation and temperature control process is adopted after magnesium metal is fed to ensure the sufficiency of the reduction reaction, and the reaction end point is judged by a system component on-line detection technology. The invention is further characterized in that the magnesium oxide waste residue is taken, the temperature is regulated to 1050-1150 ℃ in a metallurgical vacuum environment, industrial grade high-purity metal aluminum is added, and the metal aluminum and magnesium oxide undergo a thermit reduction reaction to generate the magnesium aluminum intermediate alloy. By adopting the technical scheme, the generated magnesium oxide, such as