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Carbonaceous material block molten iron bath reduction ironmaking desulphurization method

An iron bath melting and carbon material technology is applied in the field of iron bath melting reduction iron-making desulfurization of carbon-containing lumps, which can solve the problems of increasing energy consumption, increasing production cost, lowering the temperature of molten iron, etc., and achieving the effect of reducing consumption and energy consumption.

Active Publication Date: 2011-01-19
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in this way, one is that the introduction of desulfurizer increases the production cost of molten iron, and the other is that the addition of desulfurizer reduces the temperature of molten iron, which increases energy consumption and increases production costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Carbon-containing block batching and forming

[0031] Ratio of green pellets (wt): Iron concentrate powder (65% of total iron, 0.05% of sulfur) + 1.62% quicklime = 80%; 15% of anthracite (80% of C, 0.5% of sulfur); dextrin 5 %. The basicity of the iron ore concentrate powder is 0.5, and after adding quicklime, the quaternary basicity of the mixture is 0.9.

[0032] The carbon-containing block is formed by means of rollers, steel molds, disc pelletizing, cylinder pelletizing, etc.

[0033] 2. Carbon-containing block pre-reduction

[0034] The carbon-containing block prepared above was reduced at a temperature of 1250° C. for 30 minutes, and the pre-reduction metallization rate reached 80%.

[0035] 3. Iron bath melting final reduction

[0036] The above-mentioned pre-reduced carbonaceous block is subjected to melting and final reduction at a temperature of 1500° C. in the molten pool. The basicity of the final reduced top slag reaches 1.3, and 200 kg of top slag ...

Embodiment 2

[0038] 1. Carbon-containing block batching and forming

[0039] Ratio of green pellets (wt): Iron concentrate powder (65% of total iron, 0.05% of sulfur) + 1.2% quicklime = 80%; 15% of anthracite (80% of C, 0.5% of sulfur); dextrin 5 %. The alkalinity of the iron ore concentrate powder is 0.5, and after adding quicklime, the quaternary alkalinity of the mixture is 0.8.

[0040]The carbon-containing block is formed by means of rollers, steel molds, disc pelletizing, cylinder pelletizing, etc.

[0041] 2. Carbon-containing block pre-reduction

[0042] The carbon-containing block prepared above was reduced at a temperature of 1250° C. for 30 minutes, and the pre-reduction metallization rate reached 80%.

[0043] 3. Iron bath melting final reduction

[0044] The above-mentioned pre-reduced carbonaceous block is subjected to melting and final reduction at a temperature of 1500° C. in the molten pool. The basicity of the final reduced top slag reaches 1.3, and 200 kg of top sla...

Embodiment 3

[0046] 1. Carbon-containing block batching and forming

[0047] Ratio of green pellets (wt): Iron concentrate powder (65% of total iron, 0.05% of sulfur) + 2.41% quicklime = 80%; 15% of anthracite (80% of C, 0.5% of sulfur); dextrin 5 %. The alkalinity of the iron concentrate powder is 0.5, and after adding quicklime, the quaternary alkalinity of the ingredients is 1.1.

[0048] The carbon-containing block is formed by means of rollers, steel molds, disc pelletizing, cylinder pelletizing, etc.

[0049] 2. Carbon-containing block pre-reduction

[0050] The carbon-containing block prepared above was reduced at a temperature of 1250° C. for 30 minutes, and the pre-reduction metallization rate reached 80%.

[0051] 3. Iron bath melting final reduction

[0052] The above-mentioned pre-reduced carbonaceous block is subjected to melting and final reduction at a temperature of 1500° C. in the molten pool. The basicity of the final reduced top slag reaches 1.3, and 200 kg of top s...

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Abstract

The invention discloses a carbon-containing material block iron-bath smelting reduction iron-making desulphurization method which comprises the blending and shaping of the carbon-containing material block, and the pre-reduction and the iron-bath smelting final reduction of the carbon-containing material block, wherein, the ingredient of the carbon-containing material block is added with alkaline matter to cause the value of quaternionic alkalinity which is (CaO plus MgO) divided by (SiO2 plus AI2O3) to be between 0.8 and 1.1; in the carbon-containing material block, the ratio of the mole number of simple substance carbon atom to that of atomic oxygen in oxides such iron, zinc and aluminum, etc. is 1 to 3. The method of the invention effectively overcomes the problems in the prior art thatafter a desulfurizing agent is introduced, the temperature of liquid iron is reduced, energy consumption and desulfurizing agent cost are increased, and liquid iron processing cost is improved. Compared with the carbon-containing ball group-iron-bath smelting reduction two-part form iron-making technology in the prior art, the method of the invention can reduce the load of liquid iron sulfur by more than 10 percent.

Description

technical field [0001] The invention belongs to the technical field of smelting reduction of high-iron-containing materials mainly composed of iron ore powder, and more specifically relates to an ironmaking desulfurization method for smelting reduction of carbon-containing lump iron baths. Background technique [0002] As a non-blast furnace ironmaking method, the smelting reduction method was proposed as early as the 1920s, but it did not attract people's attention until the 1960s. The "one-step method" developed earlier, that is, the entire reduction smelting process is carried out in one Finished in the container. Such as, dored method, retored method, cip method, eketorp-vall method, etc. But these methods have not been applied in production due to financial or technical reasons. Since the 1970s, Sweden, Federal Germany and Japan The smelting reduction method researched and developed by other countries basically belongs to the "two-step method". It divides the reduction ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B11/00C22B1/14
Inventor 王东彦李维国李肇毅
Owner BAOSHAN IRON & STEEL CO LTD
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