System and method for producing Cr-Ni-Fe composite alloy in double-process pelleting mode

A composite alloy, Inconel technology, applied in the field of metallurgy, can solve the problems affecting product indicators, the thickness of the pellets should not be too thick, and the cost is high, so as to improve the thermal energy utilization rate and production capacity, improve energy utilization rate, energy utilization rate high rate effect

Pending Publication Date: 2017-09-08
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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Problems solved by technology

At present, the rotary hearth furnace is mainly used to restore a certain iron-containing resource, such as iron and steel plant dust, vanadium-titanium ore, laterite nickel ore, chromite ore, iron-containing metallurgical slag and other single raw materials. The specific process of the rotary hearth furnace is: A certain iron-containing raw material is mixed with a certain amount of reduced coal, and then an appropriate amount of other additives and water are added. After fully mixing, the mixture is made into carbon-containing pellets. After drying, the pellets are evenly distributed through the rotary hearth furnace distribution system. The ground is laid on the bottom of the rotary hearth furnace. The bottom of the furnace carries the pellets through the preheating section and the reduction section in sequence. The heat generated by fuel combustion is mainly transferred to the furnace material from top to bottom through radiation heat transfer. This heat transfer method determines that for a carbon-containing pellet of a certain material in the furnace, the pellet's The thickness of the fabric should not be too thick, otherwise it will lead to uneven reduction of pellets, and the reduction effect of pellets from the upper layer to the lower layer will gradually deteriorate, which will eventually affect the product indicators
It can be said that the only choice of thin material layer fabric is a major inherent disadvantage of the rotary hearth furnace, which also greatly limits the production capacity of the rotary hearth furnace
On the other hand, in the stainless steel smelting process, chromium and nickel, which are the main components of stainless steel, are added in the state of chromium-iron alloy and nickel-iron alloy (or pure nickel) respectively (that is, chromium is added in the state of chromium-iron alloy, and nickel is in the state of nickel-iron alloy. ferroalloy), there has not been a material that can provide both chromium and nickel sources for stainless steel; in addition, in traditional stainless steel smelting, chromium-iron alloys are finally smelted in electric furnaces, and nickel-iron alloys are finally smelted It is smelted by electric furnace or blast furnace. The electric furnace method consumes expensive electric energy, high energy consumption and high cost. The blast furnace method is facing the situation of being eliminated due to high energy consumption and high pollution. How to design a low-energy and low-cost production of chromium-nickel The technology of iron composite alloy becomes the technical problem urgently to be solved in this field

Method used

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  • System and method for producing Cr-Ni-Fe composite alloy in double-process pelleting mode
  • System and method for producing Cr-Ni-Fe composite alloy in double-process pelleting mode

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Embodiment 1

[0066] Embodiment 1: Put the laterite nickel ore into the crushing and screening device for crushing treatment to obtain granular laterite nickel ore, uniformly mix the granular laterite nickel ore, the first reducing agent, the first additive and water, and use a high-pressure ball press The pellets are elliptical, and the Ni grade of the laterite nickel ore is 1.1%, the particle size of the laterite nickel ore is less than -3mm, of which -1mm accounts for 60%, and the fixed carbon content of semi-coke is 75%. 1.1 times the calculated amount, the particle size of semi-coke is less than -2mm, of which -1mm accounts for 50%, and the addition of limestone is 10%; the pressed laterite nickel ore hydrous pellets are oval, with a size of 33×27×16mm, The moisture content of the pellets is 17%, and they are sent to the dryer for drying treatment to obtain dry lateritic nickel ore pellets with a moisture content of less than 2%; the chromite ore is added to the grinding device for grin...

Embodiment 2

[0067] Embodiment 2: the laterite nickel ore is added into the crushing and screening device for crushing, and the granular laterite nickel ore is obtained with a particle size of less than -3mm, wherein more than 1mm accounts for more than 30% of the total weight. The granular laterite nickel ore, the first The reducing agent, the first additive and water are mixed evenly to obtain the laterite-nickel ore mixed material, and then pressed into elliptical pellets with a ball press machine. The Ni grade of the laterite-nickel ore is 1.6%, and the amount of coal added is the theoretical requirement. 1.2 times, the limestone is added as 8% of the weight of the laterite nickel ore, the laterite nickel ore is pressed into balls, the size of the laterite nickel ore pellets after pressing is 40×30×20mm, and the laterite nickel ore is dried after the pellets are dried Pellets; adding chromite ore to the grinding device for grinding to obtain fine-grained chromite with a particle size of...

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Abstract

The invention relates to a system and method for producing Inconel composite alloys by double-process ball making, wherein the system includes: a crushing and screening device, a first mixing device, a ball pressing device and a first drying device connected in sequence; The ore grinding device, the second mixing device, the pelletizing device and the second drying device; the rotary hearth furnace with a double-layer material distribution system connected to the first drying device and the second drying device respectively; A smelting device connected to a rotary hearth furnace. The present invention uses the mixed pellets of chromite and lateritic nickel ore as raw material, and adopts double-layer material distribution system and double-process ball making method according to the unique characteristics of raw materials, strictly controls the particle size and diameter of the two raw material pellets, and improves the speed of rotation. Heat utilization and production capacity of the hearth furnace.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a system and a method for producing chromium-inconel composite alloys by double-process ball making. Background technique [0002] The rotary hearth furnace is an annular high-temperature kiln with a rotatable bottom. The burners are arranged on the upper part of the furnace. The fuel is burned by the burners to generate heat, and the heat is transferred to the bottom materials through radiation heat transfer. At present, the rotary hearth furnace is mainly used to restore a certain iron-containing resource, such as iron and steel plant dust, vanadium-titanium ore, laterite nickel ore, chromite ore, iron-containing metallurgical slag and other single raw materials. The specific process of the rotary hearth furnace is: A certain iron-containing raw material is mixed with a certain amount of reduced coal, and then an appropriate amount of other additives and water ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/10C22B1/24C22B23/02C22B34/32C22C35/00
CPCC21B13/105C22B1/2406C22B23/021C22B23/023C22B34/32C22C35/00
Inventor 王静静曹志成李红科宋文臣吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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