Device and method for magnesium smelting by vacuum carbothermal reduction of calcined dolomite

Patent metadata

Field	Value
Publication number	US-2025109457-A1
Application number	US-202418979540-A
Country	US
Kind code	A1
Filing date	Dec 12, 2024
Priority date	Aug 30, 2022
Publication date	Apr 3, 2025
Grant date	—

Abstract

The present disclosure relates to the technical field of magnesium metallurgy, and in particular to a device and method for magnesium smelting by vacuum carbothermal reduction of calcined dolomite. The device includes a reaction chamber, a condensation chamber, a first temperature regulation module and an air pressure regulation module, and the reaction chamber is communicated with the condensation chamber via a gas-guide tube. In the present disclosure, different condensation zones are utilized to sequentially condense gaseous products based on dew points, effectively preventing impurities from entering the condensation process of magnesium. Additionally, based on dynamic equilibrium in the condensation process of the gaseous products within the condensation chamber, efficient condensation and collection of magnesium in the condensation zone at middle section is ensured while preventing reverse reaction between magnesium and CO in the condensation zone of magnesium, enhancing the condensation-based purification effect.

First claim

1 . A device for magnesium smelting by vacuum carbothermal reduction of calcined dolomite, comprising a reaction chamber, a condensation chamber, a first temperature regulation module, and an air pressure regulation module, wherein the first temperature regulation module serves for regulating a temperature within the reaction chamber, the air pressure regulation module serves for regulating an air pressure within the reaction chamber, and the reaction chamber is communicated with the condensation chamber via a gas-guide tube; and the gas-guide tube serves for controlling a flow rate of gaseous products from the reaction chamber into the condensation chamber, achieving dynamic equilibrium in the condensation process of the gaseous products within the condensation chamber, and a plurality of condensation zones sequentially communicated along the flow direction of the gaseous products are arranged inside the condensation chamber.

2 . The device for magnesium smelting by vacuum carbothermal reduction of calcined dolomite according to claim 1 , wherein the device further comprises a second temperature regulation module, the second temperature regulation module serves for regulating a temperature within the condensation chamber, and the second temperature regulation module is cooperated with the gas-guide tube to realize dynamic equilibrium in the condensation process of the gaseous products within the condensation chamber.

3 . The device for magnesium smelting by vacuum carbothermal reduction of calcined dolomite according to claim 1 , wherein the condensation chamber is arranged above the reaction chamber.

4 . The device for magnesium smelting by vacuum carbothermal reduction of calcined dolomite according to claim 3 , wherein the condensation zones in the condensation chamber are arranged longitudinally and sequentially.

5 . The device for magnesium smelting by vacuum carbothermal reduction of calcined dolomite according to claim 1 , wherein a thermal insulation component is arranged between the reaction chamber and the condensation chamber.

6 . The device for magnesium smelting by vacuum carbothermal reduction of calcined dolomite according to claim 5 , wherein the thermal insulation component is a thermal insulation shroud, and the reaction chamber is arranged inside the thermal insulation shroud.

7 . The device for magnesium smelting by vacuum carbothermal reduction of calcined dolomite according to claim 6 , wherein the device further comprises a housing, and the reaction chamber, the condensation chamber, and the thermal insulation shroud are arranged inside the housing.

8 . The device for magnesium smelting by vacuum carbothermal reduction of calcined dolomite according to claim 1 , wherein a plurality of baffle plates are arranged inside the condensation chamber, the baffle plates serve for partitioning the condensation chamber into multi-stage condensation zones, and condensation grooves are disposed at tops of the baffle plates.

9 . The device for magnesium smelting by vacuum carbothermal reduction of calcined dolomite according to claim 2 , wherein a plurality of baffle plates are arranged inside the condensation chamber, the baffle plates serve for partitioning the condensation chamber into multi-stage condensation zones, and condensation grooves are disposed at tops of the baffle plates.

10 . The device for magnesium smelting by vacuum carbothermal reduction of calcined dolomite according to claim 3 , wherein a plurality of baffle plates are arranged inside the condensation chamber, the baffle plates serve for partitioning the condensation chamber into multi-stage condensation zones, and condensation grooves are disposed at tops of the baffle plates.

11 . The device for magnesium smelting by vacuum carbothermal reduction of calcined dolomite according to claim 4 , wherein a plurality of baffle plates are arranged inside the condensation chamber, the baffle plates serve for partitioning the condensation chamber into multi-stage condensation zones, and condensation grooves are disposed at tops of the baffle plates.

12 . The device for magnesium smelting by vacuum carbothermal reduction of calcined dolomite according to claim 1 , wherein the device further comprises a cooling system, and the cooling system serves for cooling the reaction chamber.

13 . The device for magnesium smelting by vacuum carbothermal reduction of calcined dolomite according to claim 2 , wherein the device further comprises a cooling system, and the cooling system serves for cooling the reaction chamber.

14 . The device for magnesium smelting by vacuum carbothermal reduction of calcined dolomite according to claim 3 , wherein the device further comprises a cooling system, and the cooling system serves for cooling the reaction chamber.

15 . The device for magnesium smelting by vacuum carbothermal reduction of calcined dolomite according to claim 4 , wherein the device further comprises a cooling system, and the cooling system serves for cooling the reaction chamber.

16 . A method for magnesium smelting by vacuum carbothermal reduction of calcined dolomite, based on the device for magnesium smelting by vacuum carbothermal reduction of calcined dolomite according to claim 1 , comprising the following steps: mixing calcined dolomite, coking coal, and a reduction catalyst, followed by briquetting, and placing a briquetted mixture in the reaction chamber under inert gas protection and a vacuum degree of 120 Pa or below, followed by heat preservation reaction at 1473 K-1723 K, wherein during the heat preservation reaction, the gaseous products are guided into the multi-stage condensation zones within the condensation chamber, and the temperature of the condensation chamber is regulated to maintain at 643 K-733 K, achieving dynamic equilibrium in the condensation process of the gaseous products within the condensation chamber; and along the flow direction of the gaseous products, temperatures of the multi-stage condensation zones within the condensation chamber gradually decrease.

17 . A method for magnesium smelting by vacuum carbothermal reduction of calcined dolomite, based on the device for magnesium smelting by vacuum carbothermal reduction of calcined dolomite according to claim 2 , comprising the following steps: mixing calcined dolomite, coking coal, and a reduction catalyst, followed by briquetting, and placing a briquetted mixture in the reaction chamber under inert gas protection and a vacuum degree of 120 Pa or below, followed by heat preservation reaction at 1473 K-1723 K, wherein during the heat preservation reaction, the gaseous products are guided into the multi-stage condensation zones within the condensation chamber, and the temperature of the condensation chamber is regulated to maintain at 643 K-733 K, achieving dynamic equilibrium in the condensation process of the gaseous products within the condensation chamber; and along the flow direction of the gaseous products, temperatures of the multi-stage condensation zones within the condensation chamber gradually decrease.

18 . A method for magnesium smelting by vacuum carbothermal reduction of calcined dolomite, based on the device for magnesium smelting by vacuum carbothermal reduction of calcined dolomite according to claim 3 , comprising the following steps: mixing calcined dolomite, coking coal, and a reduction catalyst, followed by briquetting, and placing a briquetted mixture in the reaction chamber under inert gas protection and a vacuum degree of 120 Pa or below, followed by heat preservation reaction at 1473 K-1723 K,

Assignees

• Univ Kunming Science & Technology

Inventors

• Tian Yang
• Ma Tingzhuang
• Yang Bin
• Xu Baoqiang
• Jiang Wenlong
• Wang Fei
• Li Yifu
• Wang Lipeng
• Liang Dong
• Yu Rong

Classifications

• C22B5/16

  with volatilisation or condensation of the metal being produced · CPC title

• C22B26/22 Primary

  Obtaining magnesium · CPC title

• C22B5/10

  by solid carbonaceous reducing agents · CPC title

• F27D9/00

  Cooling of furnaces or of charges therein (casings, linings, walls or roofs incorporating cooling arrangements F27D1/12) · CPC title

• F27B5/04

  adapted for treating the charge in vacuum or special atmosphere · CPC title