Method for rapidly reducing nickel slag to produce iron-nickel-copper alloy powder in kiln under reducing atmosphere

An iron-nickel-copper and kiln technology, which is applied in the field of comprehensive utilization of resources, can solve the problems that do not involve the reuse of weakly reducing tail gas, etc., and achieve the effects of shortening the reduction time, improving utilization efficiency, and improving efficiency

Active Publication Date: 2013-09-04
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

This patent adopts the chain plate machine-shaft furnace process, and carries out weak reduction at 900℃~1000℃. The raw material used is only low-grade iron ore with iron oxide as the main iron-co

Method used

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  • Method for rapidly reducing nickel slag to produce iron-nickel-copper alloy powder in kiln under reducing atmosphere

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Effect test

Embodiment 1

[0036] The process flow of this embodiment consists of four parts: kiln control, batching, section making, deep reduction roasting and crushing wet grinding-wet magnetic separation.

[0037] In order to control the strong reducing atmosphere inside the kiln, the air supply during the kiln combustion is 50% of the total air required for the complete combustion of the supplied fuel. The above-mentioned air required for complete combustion refers to the conversion of 100% of various carbon-containing compounds in the fuel into CO 2 The amount of theoretical calculations required.

[0038] In order to maintain a strong reducing atmosphere in the kiln and achieve the high temperature of 1350°C required for rapid and deep reduction in the kiln, both fuel gas and air need to be preheated at high temperature. The fuel gas used is natural gas. The preheating of natural gas adopts the tube heat exchanger to exchange heat with the high-temperature waste gas discharged from the deep red...

Embodiment 2

[0042] The main chemical components of the nickel waste slag used are: TFe40.21%, SiO 2 34.61%, Al 2 o 3 2.26%, MgO8.86%, CaO3.37%, Ni0.23%, Cu0.16%, other 2.6%. The reducing agent used is lignite, the additive used is lime, and the binder used is sodium carboxymethylcellulose (CMC). Mix and grind the above nickel waste slag, lignite and lime in proportion to 20% of the remaining 200 mesh sieve, add binder and water accounting for 9% of the dry basis of all materials, and use a section machine to make the diameter and height after mixing. They are all small cylinders of 20mm, and they are laid flat on the bottom of the kiln after drying. The thickness of the material layer is 30mm. The iron-nickel-copper alloy powder with an iron recovery rate of 97.51% was obtained by magnetic separation. The iron content of the obtained product is 91.97%, the nickel content is 0.47%, the copper content is 0.28%, and the particle size is 5-70um. It can be used as a raw material for smeltin...

Embodiment 3

[0044] The proportion of nickel waste slag, reducing agent, additive and binder used in the batching of this embodiment is, nickel waste slag:reducing agent:additive:binding agent=100:14:5.4:5. The main chemical components of the nickel waste slag used are: TFe42.31%, SiO 2 35.60%, Al 2 o 3 2.37%, MgO5.77%, CaO3.26%, Ni0.22%, Cu0.16%, other 2.55%. The reducing agent used is coke powder, the additive used is lime, and the binder used is sodium carboxymethylcellulose (CMC).

[0045] Mix and grind the above-mentioned nickel waste slag, coke powder and lime in proportion to the remaining 20% ​​of the 200 mesh sieve, add binder and water accounting for 10% of the dry basis of all materials, and use a section machine to make diameter and Small cylinders with a height of 20mm are laid flat on the bottom of the kiln after drying. The thickness of the material layer is 30mm. The reduction temperature of the material layer is 1350°C and the reduction time is 20min. The reduced materi...

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Abstract

The invention relates to a method for rapidly reducing nickel waste slag to produce iron-nickel-copper alloy powder in a kiln under the reducing atmosphere. The method is characterized by comprising the following steps of: proportionally mixing the nickel waste slag, reducing agents and additives, crushing or levigating the mixture to 200 meshes to obtain 20-40% of residues on sieve; doping agglomerants and water occupying 5-20% of all materials on a dry mass basis, and uniformly mixing; preparing small balls with the diameter of 15-33 mm or small cylinders with the diameter and the height of 15-30 mm by using a ball press machine or a section making machine; drying; flatly paving the materials at the bottom of the kiln, wherein the thickness of the material layer is 20-45 mm, the reducing temperature of the material layer is 1,250-1,450 DEG C, and the reducing time is 10-40 minutes; and performing cooling, crushing, wet grinding and wet magnetic separation on the reduced balls or sections to obtain iron-nickel-copper alloy micropowder with the iron recovery rate of 85-99 %, wherein in the obtained product, the iron content is 88-98 %, the nickel content is 0.13-1.98 %, the copper content is 0.14-1.29 % and the particle size is 3-100 microns, and the product can serve as a raw material for smelting weather-resistant steel. The tailings after wet grinding and wet magnetic separation can serve as raw materials for extracting aedelforsite or producing hollow sintered bricks.

Description

Background technique [0001] The invention relates to the field of comprehensive utilization of resources, and provides a method for rapidly reducing nickel waste slag in a reducing atmosphere kiln to produce iron-nickel-copper alloy powder. [0002] my country currently produces about 2 million tons of nickel waste slag annually, and about 4,600 tons of metallic nickel and 3,200 tons of metallic copper are wasted in the national nickel waste slag. In addition to the high value of residual metals such as nickel and copper, nickel waste slag often contains 30% to 50% iron. The iron in nickel waste slag mainly exists in the form of iron silicate, so the traditional beneficiation method is adopted The iron therein cannot be enriched to the grade of marketable iron ore concentrate powder. At present, my country's nickel waste slag is generally sold to cement plants as ingredients for firing cement clinker, and the proportion is generally 3% to 5%. Due to the lack of cement enterpr...

Claims

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Application Information

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IPC IPC(8): C22C38/16C22B5/02C22B7/04C22B1/02C21B15/00
CPCY02P10/20
Inventor 倪文王爽李克庆张玉燕王红玉
Owner UNIV OF SCI & TECH BEIJING
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