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Method and apparatus for annealing magnesium by calcining and thermic reduction method

A calcining and magnesium smelting technology, applied in the field of thermal reduction magnesium smelting and calcining, can solve the problem of high energy consumption, achieve the effects of good operation flexibility, fuel saving and optimized combination

Active Publication Date: 2008-11-19
SHIJIAZHUANG XINHUA IND FURNACE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of high energy consumption in the thermal reduction magnesium smelting process, the present invention provides a method and device for calcination and thermal reduction magnesium smelting, so that the thermal reduction magnesium smelting Combined with the optimization of the calcined dolomite process, the waste heat generated can be fully utilized, reducing energy consumption and production costs

Method used

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  • Method and apparatus for annealing magnesium by calcining and thermic reduction method
  • Method and apparatus for annealing magnesium by calcining and thermic reduction method
  • Method and apparatus for annealing magnesium by calcining and thermic reduction method

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Embodiment 1

[0018] This example figure 1 , figure 2 As shown, it is a device composed of a beam-type shaft kiln and a thermal reduction furnace, including a thermal reduction furnace 4 and a kiln 1. The thermal reduction furnace is equipped with a reduction tank 5. The reduction tank is made of heat-resistant nickel-chromium alloy steel. The furnace is equipped with a gas burner and a solid fuel burner; the middle of the kiln is divided into a preheating zone, a calcining zone and a cooling zone, the upper part of the preheating zone is provided with an upper suction beam 9, the calcining zone is provided with an air inlet beam 10, and the cooling zone There is a lower suction beam 11 in the middle. The flue gas outlet on the upper part of the thermal reduction furnace is connected to the inlet beam 10 in the calcining area of ​​the kiln 1 through the gravity dust collector 3 and the temperature regulating furnace 2 . Such as image 3 As shown, the temperature regulating furnace is eq...

Embodiment 2

[0022] Another embodiment of the present invention is as Figure 4 As shown, thermal reduction furnace 4 and rotary kiln 19 are included. The flue gas outlet of the thermal reduction furnace is connected to the high-temperature gas inlet 20 of the calcining zone of the rotary kiln 19 through the gravity dust collector 3 and the temperature regulating furnace 2 . The blower 18 is connected to the combustion air inlet 7 of the thermal reduction furnace 4 via the product cooler 17 of the rotary kiln. The high-temperature flue gas generated by magnesium smelting in the thermal reduction furnace enters the rotary kiln to calcinate dolomite, and the flue gas leaves the kiln body and goes to the raw material preheater to preheat the dolomite raw material, and then is discharged through the chimney. According to the needs of the calcined dolomite temperature in the rotary kiln 19, the temperature of the flue gas entering the rotary kiln is adjusted with the temperature regulating fur...

Embodiment 3

[0024] The third embodiment of the present invention is as Figure 5 As shown, four thermal reduction furnaces 4 and one kiln 1 are included. The flue gas outlets of the four thermal reduction furnaces are connected in parallel, and then pass through the gravity dust collector 3, and the temperature regulating furnace 2 is connected to the calcining area of ​​the kiln 1. There is a valve 8 on the flue gas outlet pipeline of each thermal reduction furnace. When one thermal reduction furnace is loading or unloading, the valve can be closed to disconnect the connection with the system. The other thermal reduction furnaces are still running to ensure that the device Continuity of operation.

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Abstract

The invention provides a method and a device for calcining magnesium and smelting magnesium by thermal reduction. The device comprises a kiln for calcining materials and at least one thermal reduction furnace, wherein, a reduction pot is arranged in the thermal reduction furnace; the kiln is divided into a preheating zone, a calcining zone and a cooling zone; a smoke outlet of the thermal reduction furnace is connected to the calcining zone of the kiln; and high-temperature smoke gas exhausted by the thermal reduction furnace is used to calcine dolomite in the kiln. Meanwhile, waste gas and hot air in the kiln are used to preheat fuel and combustion air in the thermal reduction furnace, or the hot air in the kiln for cooling products is directly used as the combustion air. The method and the device realize an optimized combination of smelting the magnesium by the thermal reduction and calcining the dolomite, save about 30 to 40 percent of fuel through sufficiently using residual heat in magnesium production process, and have the advantages of compact device and small occupied area. A plurality of thermal reduction furnaces can operate in parallel and continuously run with good operational flexibility.

Description

technical field [0001] The invention relates to a method and device for calcination and thermal reduction magnesium smelting, which belong to the technical field of industrial kilns and light metal metallurgy. Background technique [0002] Magnesium smelting by thermal reduction method is one of the methods to produce metal magnesium. Dolomite, magnesite, etc. are mainly used as raw materials, which are calcined into magnesium oxide in a kiln, and then reduced to metal magnesium by adding a reducing agent in a thermal reduction furnace. The Pidgeon process is commonly used in China to smelt magnesium, that is, calcined dolomite (MgO, CaO) is used as raw material, ferrosilicon (Si-Fe) is used as reducing agent, mixed according to a certain proportion, ground into fine powder, and pressed into agglomerates , into the reduction tank, heated and reduced in a thermal reduction furnace to obtain magnesium vapor, condensed and crystallized into solid magnesium, and then melted into...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/22
Inventor 贾会平
Owner SHIJIAZHUANG XINHUA IND FURNACE CO LTD