Method of directly reducing vanadium-titanium ore hot-pressing blocks in rotary hearth furnace and melting in electric furnace

A technology of vanadium-titanium ore and hot briquetting, applied in the direction of rotary drum furnace, furnace, furnace type, etc., can solve the problem of reducing the production efficiency of the rotary hearth furnace reduction process, increasing the energy consumption and cost of the electric furnace melting process, and not being able to use multi-layer Cloth and other issues, to achieve broad market industrial application prospects, significant social and economic benefits, good separation and enrichment effect

Inactive Publication Date: 2014-11-05
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] But above these methods mainly have the following problems: (1) add a large amount of binders in the process of preparing vanadium-titanium-titanium pellets, because the binders are expensive, the overall production cost remains high; (2) through The vanadium-titanium ore pellets prepared by adding a binder have very low strength under high temperature conditions, so in the process of entering the rotary hearth furnace for reduction, generally only single-layer cloth can be used instead of multi-layer cloth, which is greatly Reduced the production efficiency of the rotary hearth furnace reduction process; (3) additives and binders etc. will bring in a large amount of harmful impurity elements,

Method used

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  • Method of directly reducing vanadium-titanium ore hot-pressing blocks in rotary hearth furnace and melting in electric furnace
  • Method of directly reducing vanadium-titanium ore hot-pressing blocks in rotary hearth furnace and melting in electric furnace
  • Method of directly reducing vanadium-titanium ore hot-pressing blocks in rotary hearth furnace and melting in electric furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Taking the vanadium-titanium ore powder that a company is using as raw material, its total iron TFe content is 53.15%, V 2 o 5 The content is 0.712%, TiO 2The content is 11.06%, its chemical composition is shown in Table 1 by mass percentage, and the particle size of the mineral powder is not greater than 0.15mm.

[0032] Table 1 Main chemical components of vanadium-titanite

[0033]

[0034] Taking the bituminous coal powder being used by a company as the carbon-containing raw material, the fixed carbon content is 50.94%, the ash and volatile content are 14.00% and 34.70% respectively, the colloidal layer index of the bituminous coal is 11, and the chemical composition is shown in mass percentage. In Table 2 and Table 3 below, the particle size of bituminous coal powder is not greater than 0.15mm.

[0035] Table 2 Chemical composition of a bituminous coal ( / %)

[0036]

[0037] Table 3 Chemical composition of bituminous coal ash

[0038]

[0039] The abov...

Embodiment 2

[0047] Still take the ore powder and coal powder listed in Example 1 as raw materials.

[0048] The above two raw materials are mixed, mixed, heated and hot-pressed according to the mass percentages of vanadium-titanium ore powder and bituminous coal powder being 74.46% and 25.54% respectively.

[0049] In the hot-pressing process, the hot-pressing temperature is 300°C, and the hot-pressing pressure is 40 MPa. The composition of the vanadium-titanium ore hot-briquette obtained by pressing is shown in Table 5 by mass percentage. The compressive strength of the vanadium-titanium hot-briquette is 1224N, and the drop strength is 6.2 Times / pieces.

[0050] Table 5 Main chemical composition of vanadium-titanium magnetite hot briquettes

[0051]

[0052] The pressed vanadium-titanium ore hot briquettes are put into the hearth of the rotary hearth furnace through the distribution machine, and three layers of distribution are carried out. The reduction temperature of the rotary hea...

Embodiment 3

[0056] Still take the ore powder and coal powder listed in Example 1 as raw materials.

[0057] The above-mentioned two kinds of raw materials are prepared according to the mass percentages of vanadium-titanium ore powder and bituminous coal powder of 71.42% and 28.58%, respectively, and are mixed, heated and hot-pressed.

[0058] In the hot-pressing process, the hot-pressing temperature and hot-pressing pressure are 350°C and 45MPa, respectively. The composition of the vanadium-titanium ore hot-briquettes obtained by final pressing is shown in Table 6. The compressive strength of the vanadium-titanium hot-briquettes is 1482N, and the drop strength is 8 times / indivual.

[0059] Table 6 Main chemical components of vanadium-titanium magnetite hot briquettes

[0060]

[0061] The pressed vanadium-titanium ore hot briquette enters the bottom of the rotary hearth furnace through the distribution machine, and multi-layer distribution is carried out. The thickness of the materia...

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Abstract

The invention belongs to the technical field of comprehensive utilization of metallurgical resources, and in particular relates to a comprehensive utilization method of directly reducing vanadium-titanium ore hot-pressing blocks in a rotary hearth furnace and melting in an electric furnace. The method comprises the following steps: (1) blending vanadium-titanium ore mineral powder with bituminous coal powder, heating mixed powder and carrying out hot-press molding so as to obtain the vanadium-titanium ore hot-pressing blocks; (2) putting the vanadium-titanium ore hot-pressing blocks into the rotary hearth furnace by covering multiple layers of materials on the vanadium-titanium ore hot-pressing blocks and carrying out direct reduction via thick material layers; (3) melting products obtained by reducing the vanadium-titanium ore hot-pressing blocks in the rotary hearth furnace so as to obtain vanadium-containing molten iron and titanium slag; and (4) carrying out vanadium blowing and steelmaking on the vanadium-containing molten iron so as to obtain vanadium slag and a steel ingot, wherein the vanadium slag can serve as a raw material for preparing titanium dioxide. The method which is used for preparing the vanadium-titanium ore hot-pressing blocks has the advantages of low production cost, high production efficiency, low energy consumption, good quality of the vanadium titanium ore hot-pressing blocks and the like. Thus, the economy of the process of directly reducing vanadium-titanium ores in the rotary hearth furnace and melting in the electric furnace is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of metallurgical resources, and in particular relates to a method for comprehensive utilization of vanadium-titanium ore hot-briquetting rotary hearth furnace direct reduction-electric furnace melting. Background technique [0002] Minerals containing vanadium and titanium are world-recognized important strategic resources. Vanadium and titanium are important material guarantees for national economic development and national security. They are widely used in metallurgy, chemical industry, aerospace, national defense and military fields. Vanadium-titanium magnetite is the most important carrier of vanadium-titanium resources. It is widely distributed in Panxi, Chengde, Hanzhong, Xiangyang and other places in my country. Its reserves are abundant, exceeding 10 billion tons in Panzhihua alone. However, in view of the grade requirements of the current processing and utilization indust...

Claims

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Application Information

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IPC IPC(8): C22B34/22C22B34/12C22B1/16C21B13/08
CPCY02P10/143
Inventor 储满生柳政根赵伟王宏涛唐珏汤雅婷冯聪
Owner NORTHEASTERN UNIV
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