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Tubular heat exchanger with inert coating layer and application to titanium sponge production

A technology of tubular heat exchanger and cladding layer, which is applied in the field of rare metal metallurgy, can solve the problems of increasing the contact area between sponge titanium and metal panel iron, failing to expand the distillation area of ​​titanium lump, and long production cycle of sponge titanium. Achieve the effect of avoiding spontaneous combustion, avoiding the problem of titanium lump hard core, and improving the efficiency of reduction reaction

Active Publication Date: 2016-09-07
王进民
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As we all know, problems such as long production cycle, high energy consumption, low single-furnace output and high scrap rate of magnesia-thermal sponge titanium have always been urgent problems to be solved by people in the industry.
Because the panels of the partition device are closely combined with the deposited titanium crystals, it cannot achieve the purpose of expanding the distillation area of ​​the titanium pile, but will increase the contact area between the sponge titanium and the metal panel iron, resulting in an increase in the amount of sponge titanium ferro-titanium.
[0010] Therefore, from the perspective of the existing titanium sponge production technology, there is no effective technical method that can really solve the above problems

Method used

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  • Tubular heat exchanger with inert coating layer and application to titanium sponge production
  • Tubular heat exchanger with inert coating layer and application to titanium sponge production
  • Tubular heat exchanger with inert coating layer and application to titanium sponge production

Examples

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Effect test

Embodiment 1

[0099] Such as figure 1 , figure 2 , image 3 As shown, in Example 1 of the present invention, the diameter of the reduction furnace reactor 6 is 1860mm, and the length is 4500mm; the tubular heat exchanger 3 and the reduction furnace reactor 6 are arranged concentrically, and the outer The outer diameter of the tube 4 is 200 mm, and the wall thickness of the outer tube is 10 mm. The outer diameter of the inner tube 2 of the tubular heat exchanger 3 is 140 mm, and the wall thickness of the inner tube 2 is 5 mm. The height of the inner tube lower end 9 from the inner side of the outer tube lower end 10 is 80mm. The lower end 10 of the outer tube is located on the upper part of the sieve plate 11, and the height from the sieve plate 11 is 800 mm.

[0100] The inert cladding layer of the inert cladding tube heat exchanger 1 in this embodiment adopts the method of mold casting to pre-coat the surface of the tube heat exchanger 3 with an inert substance, and the material of the...

Embodiment 2

[0104] Such as Figure 4 , Figure 5 As shown, the difference between this embodiment and Embodiment 1 is that a layer of magnesium chloride inert material is pre-coated on a partial section of the outer surface of the tubular heat exchanger 3 . That is: such as Figure 4 As shown, the outer surface of the tubular heat exchanger 3 from the inner side of the reduction furnace reactor upper cover 16 to 200mm below the metal magnesium starting liquid level 7-1 is pre-coated with inert substance magnesium chloride to form an inert coating. Cladding 5-1; or as Figure 5 As shown, the exterior of the tubular heat exchanger 3 located at 200mm below the initial liquid level 7-1 of the reduction reaction of liquid metal magnesium in the reduction furnace reactor to 200mm above the liquid level 7-2 of the liquid metal magnesium reduction reaction The surface is pre-coated with inert substance magnesium chloride to form an inert coating layer 5-2; and the part of the lower surface of ...

Embodiment 3

[0107] Such as Figure 6 As shown, in this embodiment, the inert coating layer 5-4 on the outer surface of the tubular heat exchanger 3 located above the initial liquid level 7-1 of the reduction reaction of liquid metal magnesium in the reduction furnace reactor is added to the liquid state through the top. Magnesium metal is pre-formed in such a way that it forms condensation crusts on the outer surface of the tube heat exchanger.

[0108] That is, when the temperature of the reduction furnace reactor rises to 750-800°C, the liquid metal magnesium is added along the tube wall of the tube heat exchanger 3 by lifting the ladle, and the liquid metal magnesium flowing downwards in the tube heat exchange Under the action of the liquid cooling medium circulating in the device 3, it is solidified to form a pre-inert coating layer 5-4. The inert coating layer 5-4 reacts with titanium tetrachloride gas in the atmosphere inside the reactor after the magnesothermic reduction reaction ...

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Abstract

The invention discloses a tubular heat exchanger with an inert coating layer and application to titanium sponge production. The tubular heat exchanger can be used for quickly rejecting heat generated from a magnesiothermic reduction reaction and gathered in a liquid magnesium central area, so that the titanium tetrachloride feeding amount can be multiplied; meanwhile, the inert coating layer on the surface of the tubular heat exchanger always remains in a solidification state, thereby preventing formation, deposition and attachment of a titanium crystal on the metal surface of the tubular heat exchanger, and preventing bonding of a titanium lump and the metal surface of the tubular heat exchanger; and after the reduction is finished, the coating layer is melted and drops off, and a cavity is formed in the axis position of the titanium lump, so that the titanium sponge distillation period can be shortened by half or above. By adoption of the tubular heat exchanger provided by the invention, the titanium sponge production efficiency is multiplied, the power consumption cost is greatly reduced, and a prerequisite is provided for further enlargement of a furnace profile.

Description

technical field [0001] The invention relates to the technical field of rare metal metallurgy, in particular to the alloy technology for producing titanium, zirconium, hafnium, vanadium, chromium and other metals and their metals by magnesia thermal reduction. Background technique [0002] The present invention is applicable to the production of all metal halides by the metallothermic reduction method, such as the production of sponge titanium by the thermal reduction method of titanium and magnesium tetrachloride, and the production of sponge zirconium by the thermal reduction method of zirconium magnesium tetrachloride. For the convenience of illustration and understanding, the present invention takes the production of sponge titanium as a special case for specific analysis and illustration. [0003] The magnesia thermal reduction method is currently the main method for the production of sponge titanium, and its production process mainly includes the magnesia thermal reduct...

Claims

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Application Information

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IPC IPC(8): C22B34/12F28D7/12
CPCC22B34/1272F28D7/12
Inventor 王进民其他发明人请求不公开姓名
Owner 王进民
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