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 expandi

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

Experimental program
Comparison scheme
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Example Embodiment

[0098] Example 1:

[0099] like figure 1 , figure 2 , image 3 As shown, in Example 1 of the present invention, the diameter of the reduction furnace reactor 6 is 1860 mm and the length is 4500 mm; the tubular heat exchanger 3 and the reduction furnace reactor 6 are coaxially arranged, and the outer The outer diameter of the tube 4 is 200mm, the wall thickness of the outer tube is 10mm, the outer diameter of the inner tube 2 of the tubular heat exchanger 3 is 140mm, and the wall thickness of the inner tube 2 is 5mm. The height of the inner tube lower end 9 from the inner side of the outer tube lower end 10 is 80 mm. 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 tubular heat exchanger 1 of this embodiment is pre-coated with an integral inert material on the surface of the tubular heat exchanger 3 by the method of mold casting, and the material...

Example Embodiment

[0103] Example 2:

[0104] like 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: as Figure 4 As shown, the outer surface of the tubular heat exchanger 3 in the section from the inner side of the upper cover 16 of the reduction furnace reactor to 200 mm below the initial liquid level of metal magnesium 7-1 is pre-coated with an inert substance magnesium chloride to form an inert package. Cladding 5-1; or as in Figure 5 As shown, the outer part of the tubular heat exchanger 3 is located in the section between 200 mm below the initial liquid level 7-1 of the liquid magnesium reduction reaction in the reduction furnace reactor to 200 above the liquid magnesium reduction reaction end liquid level 7-2. The surface is pre-coated with an inert substance magnesium chloride to form an inert co...

Example Embodiment

[0106] Example 3:

[0107] like Image 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 the liquid magnesium metal in the reduction furnace reactor is added with liquid through the top The magnesium metal is pre-formed in the form of condensation crusts on the outer surface of the tubular heat exchanger.

[0108] That is, when the temperature of the reduction furnace reactor rises to 750-800 °C, the liquid metal magnesium is added around the tube wall of the tubular heat exchanger 3 through the ladle, and the liquid metal magnesium flowing downward is heated in the tubular heat exchanger. Under the action of the liquid cooling medium circulating in the vessel 3, the pre-inert coating layer 5-4 is formed by solidification. The inert coating layer 5-4 reacts with the titanium tetrachloride gas in the inner atmosphere of the reactor after the m...

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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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