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Additive composition for metal sintering

A technology for metal sintering and alkali metal compounds, which is applied in the field of metal sintering compositions, can solve problems such as excessive heat, ore quality decline, and sinter strength reduction, and achieves the effects of improving sintering yield and saving heat sources.

Inactive Publication Date: 2013-01-30
吴美惠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In this case, the existing additives mainly utilize calcium carbonate (CaCO 3 ) or calcium oxide (CaO); however, they consume more heat, reduce the efficiency of sintering and smelting, and reduce the strength of sintered ore due to the decline in ore quality

Method used

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  • Additive composition for metal sintering
  • Additive composition for metal sintering
  • Additive composition for metal sintering

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Effect test

no. 1 approach

[0028] The first embodiment: calcium carbonate (CaCO 3)+alkali metal compound (lithium, potassium or sodium, etc.)

[0029] First, according to one embodiment of the additive composition for metal sintering, one comprising calcium carbonate (CaCO 3 ) and an alkali metal compound as an additive for sintering.

[0030] Calcium carbonate and alkali metal compounds are melting accelerators that lower the melting point in sintered iron ore and facilitate chemical reactions during iron ore sintering using heat sources such as coal, coke, coal or coke powder or the like. In more detail, calcium carbonate is strong in the catalytic performance of causing a chemical reaction by burning a heat source and increasing the rate of a chemical reaction without significantly affecting the heat of reaction, and alkali metal compounds have high basicity, which can accelerate a heat source by chemical reaction Combustion increases the heat of reaction.

[0031] The calcium carbonate may utiliz...

no. 2 approach

[0083] Second embodiment: calcium carbonate+alkali metal compound+magnesium compound

[0084] According to a second embodiment, the composition comprises, in addition to an alkali metal compound and calcium carbonate, a magnesium compound, said additive being used for sintering. That is, a magnesium compound is additionally added to the alkali metal compound to promote the formation of calcium ferrite and magnesium ferrite for bonding between iron ore particles.

[0085] When said alkali metal compound is used in excess, it impairs the density of sintered ore, resulting in less strength increase, so magnesium compound is used to supplement said alkali metal compound.

[0086] Described magnesium compound comprises at least one selected from magnesium oxide (MgO), magnesium carbonate (MgCO 3 ), magnesium bicarbonate (Mg(HCO 3 ) 2 ), magnesium hydroxide (Mg(OH) 2 ), magnesium peroxide (MgO 2 ), magnesium nitrate (Mg(NO 3 ) 2 ) compounds.

[0087] As mentioned above, wher...

no. 3 approach

[0122] The third embodiment: calcium carbonate + alkali metal compound + manganese compound

[0123] According to a third embodiment, the composition comprises, in addition to the sintering additives calcium carbonate and alkali metal compounds, a manganese compound. That is, in order to improve the efficiency of the sintering process, a manganese compound having a higher melting point than the alkali metal compound is added.

[0124] The manganese compound includes at least one selected from manganese dioxide (MnO 2 ), manganese carbonate (MnCO 3 ), manganese oxide (MnO), manganese trioxide (MnO 3 ), manganese trioxide (Mn 2 o 3 ), trimanganese tetraoxide (Mn 3 o 4 ), manganese nitrate (Mn(NO 3 ) 2 ) and potassium permanganate (KMnO 4 ) compounds.

[0125] The effects of the various manganese compound additive groups will now be described in conjunction with the following Tables 23-26, which show the measured results for each group of experimental examples. In this c...

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Abstract

Provided is an additive composition for metal sintering, which comprises an alkali metal compound that is added together with calcium carbonate constituting a melting accelerator for lowering the melting point in the process of sintering iron ore or the like, in such a way as to be able to economise on a heat source such as coal or coke which is necessary for the sintering of the iron ore, reduce the melting point of the sintered ore and enhance sintering efficiency by means of a chemical mechanism wherein the additive composition is additionally used together with the alkali metal compound during the sintering of the iron ore; the alkali metal compound being one or more compounds selected from the group consisting of lithium(Li), potassium(K), and sodium(Na).

Description

technical field [0001] The present invention relates to a composition for metal sintering; more particularly, relates to a composition for metal sintering by using an additive composition comprising an alkali metal compound in the sintering process of iron ore and the like A chemical mechanism capable of reducing the use of heat sources such as coal or coke required in the sintering of iron ore and the like, and increasing the melting performance and sintering efficiency of the sintered ore. Background technique [0002] In general, iron ore refers to the rock or soil from which metallic iron can be mined economically, usually with an iron content of 30%-70%, which can be divided into magnetite, hematite, limonite and side iron ore. Most of the time, iron ore is in the form of oxidized steel rather than pure iron, so it is smelted into pig iron in blast furnaces. [0003] Here, in the ironmaking process, iron ore is put into a blast furnace, and the oxygen in the iron ore ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/243C22B1/16
CPCC22B1/243C22B1/16C22B1/205
Inventor 吴美惠柳奈见柳皖于柳沇锡
Owner 吴美惠
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