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Nickel-containing sponge iron, and its preparing method and method for producing nickel alloy billet

A technology of sponge iron and iron scale, which is applied in the manufacture of nickel alloy billets, the production of nickel-containing sponge iron, and the field of nickel-containing sponge iron, can solve the problems of waste of resources, occupation of large idle space, environmental pollution, etc., and reduce production costs. , the effect of eliminating pollution problems and saving precious resources

Inactive Publication Date: 2005-07-20
李增元
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] On the one hand, the supply and demand of nickel, one of the important raw materials for the production of stainless steel, is tight all over the world; on the other hand, by-products such as flue dust, layer mud, and iron scale produced during the production of stainless steel in my country have not yet been produced. A suitable recycling method is piled up and discarded in large quantities, and cannot be recycled and reused
Pile up and discard these wastes, not only need to occupy a lot of free space, but also cause serious environmental pollution
Especially since these wastes contain about 1 to 4% of the precious metal nickel, as well as many other elements such as chromium, titanium, manganese, molybdenum, copper, niobium, phosphorus, etc., and these elements are used in the smelting of stainless steel If the elements that need to be added are discarded directly and not recycled, it will inevitably cause a great waste of resources, which is not conducive to the further development of my country's stainless steel industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take the waste flue ash from smelting stainless steel, crush it to the required fineness, mix it evenly with coal coke powder at a weight ratio of 10:0.6, add an appropriate amount of water, put it into an extruder, and extrude it with a pressure of 0.4t into a rough billet.

[0028] Coal coke powder and limestone are pulverized into fine powder respectively, and mixed uniformly according to the weight ratio of 3:1 to make the reducing agent.

[0029] Put the extruded rough billet into the reduction tank, each tank is filled with 25Kg, and then add 6.5Kg of the above-mentioned reducing agent, fill the gap in the reduction tank, and add a cover.

[0030] Bring all the installed reduction tanks together into a tunnel kiln that has been heated to 1000°C and kept at a constant temperature. After roasting at a constant temperature for 6 hours, leave the kiln to cool, pour out the product from the reduction tank, and clean up the residual reducing agent attached to the surfac...

Embodiment 2

[0033] Take the waste flue ash and iron scale from smelting stainless steel, grind them to the required fineness respectively, mix them with coal coke powder and borax according to the weight ratio of 6:4:1.2:0.1, add appropriate amount of water, put them into extrusion In the machine, it is extruded into a rough billet with a pressure of 1t.

[0034] Coal coke powder and limestone are pulverized into fine powder respectively, and then mixed evenly according to the weight ratio of 4:1 to make the reducing agent.

[0035] Put the extruded rough billet into the reducing tank, and put 25Kg into each tank, then add 4Kg of the above-mentioned reducing agent, fill in the gap in the reducing tank, and add a cover.

[0036] Bring all the installed reduction tanks together into a tunnel kiln that has been heated to 1300°C and kept at constant temperature. After roasting at a constant temperature for 5 hours, leave the kiln to cool, pour out the product from the reduction tank, and clea...

Embodiment 3

[0039] Take the waste iron scale from smelting stainless steel and stainless steel cutting slag, grind them to the required fineness respectively, mix them with coal coke powder evenly according to the weight ratio of 7:3:1, add an appropriate amount of water, and put them into the extruder, Extruded into a rough billet with a pressure of 2.5t.

[0040] Coal coke powder and limestone are pulverized into fine powder respectively, and mixed uniformly according to the weight ratio of 5:1 to make the reducing agent.

[0041] Put the extruded rough billet into reduction tanks, each tank is filled with 25Kg, and then add 4.5Kg of the above-mentioned reducing agent, fill in the gaps in the reduction tank, and add a cover.

[0042] Bring all the installed reduction tanks together into a tunnel kiln that has been heated to 1350°C and kept at a constant temperature. After roasting at a constant temperature for 6 hours, leave the kiln to cool, pour out the product from the reduction tank...

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PUM

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Abstract

The present invention relates to one kind of nickel-containing sponge iron and its production process as well as process of producing nickel alloy steel billet. The waste from stainless steel smelting, including fume, slime and iron scale as the main material is mixed with coke powder; the mixture is extruded to form, filled into reducing tank and reduced through roasting in kiln at 1000-1500 deg.c to obtain nickel-containing sponge iron. Further, the nickel-containing sponge iron, ferrosilicon powder, limestone powder and carbon powder are smelted in arc furnace into nickel alloy steel billet, which is used for smelting stainless steel. The present invention utilizes the waste and can lower the production cost of stainless steel.

Description

Technical field [0001] The invention relates to sponge iron in iron and steel smelting, in particular to a nickel-containing sponge iron and a production method of the nickel-containing sponge iron. The invention also relates to a method for manufacturing a nickel alloy billet by utilizing the nickel-containing sponge iron. Background technique [0002] Nickel is an excellent corrosion-resistant material and an important alloying element in alloy steel, especially nickel is an element that forms austenite in steel and is an important part of stainless steel. [0003] With the large-scale development and application of nickel-based heat-resistant alloys and high-strength steels containing less than 20% nickel, and the rapid development of the chemical industry, the demand for stainless steel is increasing, and the demand for metal nickel is also increasing day by day, especially in China. The stainless steel industry is developing rapidly. In 2003, China's stainless steel co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/04C22C1/02C22C19/03
Inventor 李增元
Owner 李增元
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