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Method for preparing reduced ilmenite for welding electrodes by reducing marine placer through microwaves of rotary hearth furnace

A technology of sea sand ore and rotary hearth furnace, which is applied in chemical instruments and methods, magnetic separation, solid separation, etc. It can solve the problems of long reduction period and weak reduction intensity, and achieve the purpose of increasing the contact area of ​​materials, increasing the reaction intensity, The effect of shortening the time

Active Publication Date: 2016-08-31
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems and deficiencies of the existing ilmenite direct reduction process such as weak reduction strength and long reduction cycle, the present invention provides a method for reducing sea sand ore in a rotary hearth furnace to prepare reduced ilmenite for welding rods

Method used

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  • Method for preparing reduced ilmenite for welding electrodes by reducing marine placer through microwaves of rotary hearth furnace
  • Method for preparing reduced ilmenite for welding electrodes by reducing marine placer through microwaves of rotary hearth furnace

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Experimental program
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Effect test

Embodiment 1

[0022] Such as figure 1 Shown, this rotary hearth furnace microwave reduction sea sand ore prepares the method for reducing ilmenite for welding rod, and its concrete steps are as follows:

[0023] (1) Mixing ingredients and briquetting: first, 100g sea sand ore (Australian sea sand ore provided by a titanium factory in Tianjin is used, and its chemical composition is TiO by mass percentage 2 50.71%, TFe32.18%, FeO25.77%, SiO 2 0.79%, MgO1.05%, CaO0.28%, Al 2 o 3 0.69%, P0.058% and S0.009%, the particle size is less than 200 mesh) and coal powder (anthracite coal powder sold in the market, its main components are calculated by mass percentage, volatile content is 9.21%, ash content is 13.43%, fixed carbon 72.56%, the particle size is less than 200 mesh) according to the molar ratio of the oxygen in the iron oxide in the sea sand ore and the carbon in the coal powder is 1:1, the mixture is obtained, and then 1% of the mixture mass is added to the mixture Mix the binder (bin...

Embodiment 2

[0028] Such as figure 1 Shown, this rotary hearth furnace microwave reduction sea sand ore prepares the method for reducing ilmenite for welding rod, and its concrete steps are as follows:

[0029] (1) Mixing ingredients and briquetting: first, 100g sea sand ore (Australian sea sand ore provided by a titanium factory in Tianjin is used, and its chemical composition is TiO by mass percentage 2 50.71%, TFe32.18%, FeO25.77%, SiO 2 0.79%, MgO1.05%, CaO0.28%, Al 2 o 3 0.69%, P0.058% and S0.009%, the particle size is less than 200 mesh) and coal powder (anthracite coal powder sold in the market, its main components are calculated by mass percentage, volatile content is 9.21%, ash content is 13.43%, fixed carbon 72.56%, the particle size is less than 200 mesh) according to the molar ratio of the oxygen in the iron oxide in the sea sand ore and the carbon in the coal powder is 1:1.2, the mixture is obtained, and then 1.5% of the mixture mass is added to the mixture The binder (the...

Embodiment 3

[0034] Such as figure 1 Shown, this rotary hearth furnace microwave reduction sea sand ore prepares the method for reducing ilmenite for welding rod, and its concrete steps are as follows:

[0035](1) Mixing ingredients and briquetting: first, 100g sea sand ore (Australian sea sand ore provided by a titanium factory in Tianjin is used, and its chemical composition is TiO by mass percentage 2 50.71%, TFe32.18%, FeO25.77%, SiO 2 0.79%, MgO1.05%, CaO0.28%, Al 2 o 3 0.69%, P0.058% and S0.009%, the particle size is less than 200 mesh) and coal powder (anthracite coal powder sold in the market, its main components are calculated by mass percentage, volatile content is 9.21%, ash content is 13.43%, fixed carbon 72.56%, the particle size is less than 200 mesh) according to the molar ratio of the oxygen in the iron oxide in the sea sand ore and the carbon in the coal powder is 1:1.1, the mixture is obtained, and then 2% of the mixture mass is added to the mixture The binder (the bi...

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Abstract

The invention relates to a method for preparing reduced ilmenite for welding electrodes by reducing marine placer through microwaves of a rotary hearth furnace and belongs to the technical field of microwave metallurgy. The method comprises the steps that firstly, the marine placer and coal powder are mixed according to marine placer batch mixing to obtain a mixture, a bonding agent is added into the mixture and mixed evenly and are subjected to wet pressing to be made into green pellets, and the green pellets are dried; secondly, the dried pellets are placed into the microwave rotary hearth furnace for reduction for 10-30 min and then cooled to the room temperature; and thirdly, electromagnetic separation treatment is carried out on the pellets subjected to microwave rotating reduction at magnetic field intensity to obtain the reduced ilmenite, wherein fine coal powder, subjected to an incomplete reaction, in the welding electrodes is removed. According to the method, the rotary hearth furnace is used for block pressing treatment on carbon-containing pellets, so that the material contact area is increased, the reaction intensity is improved, and reduced ilmenite products, meeting the YB / T5141-93 technological requirements, for the welding electrodes are prepared.

Description

technical field [0001] The invention relates to a method for preparing reduced ilmenite for welding electrodes by microwave reduction of sea sand ore in a rotary hearth furnace, and belongs to the technical field of microwave metallurgy. Background technique [0002] Rutile TiO 2 It is the main component in the coating on the surface of the electrode, and it is a good slag-forming agent, deoxidizer, diluent, binder and stabilizer for welding flux. In recent years, due to the increasing depletion of natural rutile and the high energy consumption and high cost of the artificial rutile industry, reduced ilmenite has received great attention in the electrode coating industry. At present, more than 80% of J442 electrode coatings in China use reduced ilmenite as raw material. The reason is that the main component of reduced ilmenite is TiO 2 And metal Fe, it not only has the functions of rutile to improve arc stability and re-strike performance, improve slag fluidity and weld fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/244C22B1/02B03C1/02
CPCC22B1/02C22B1/2406C22B1/244B03C1/02
Inventor 胡途廖雪峰彭金辉张利波陈菓林国程松李杰
Owner KUNMING UNIV OF SCI & TECH
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