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Elevated short process energy-saving rkef nickel-iron alloy production equipment and technology

A technology of nickel-iron alloy and production equipment, applied in the field of metallurgy, can solve the problems of unfavorable electric furnace high temperature flue gas recycling, large difference in RKEF process, easy blocking of pipelines for flue gas transportation, etc., achieving significant energy saving effect, reducing environmental protection investment, and solving smoke The effect of dust accumulation

Active Publication Date: 2016-07-06
四川省冶金设计研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional RKEF process, the drying kiln and rotary kiln are scattered, and the high-temperature calcination process is as follows: rotary kiln→insulation material tank→travel (up to the top of the electric furnace, precise positioning is required)→high-level silo→electric furnace, high-temperature calcination requires The special equipment will produce a large temperature drop and a large amount of dust after being transported twice. At the same time, the drying kiln is arranged far away, and the flue gas pipeline is too long. full recycling of
[0003] Through the research on the RKEF process, it is found that the configuration of the RKEF process varies greatly among manufacturers, and each has its own characteristics (such as electric furnace type, feeding method, flue gas heat energy utilization, etc.), and there are large project investment and imperfect heat energy utilization. , many calcined sand transfer equipment, complicated process, easy to block pipes for flue gas transmission, etc.

Method used

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  • Elevated short process energy-saving rkef nickel-iron alloy production equipment and technology
  • Elevated short process energy-saving rkef nickel-iron alloy production equipment and technology
  • Elevated short process energy-saving rkef nickel-iron alloy production equipment and technology

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Such as figure 1 As shown, the laterite nickel ore is dried through a rotary kiln. The ore contains 30% water before drying, and is dried to about 20% water. The drying kiln uses the high-temperature flue gas of the electric furnace as fuel, and reserves coal injection equipment as spare and supplementary equipment. After drying, the laterite nickel ore, reduced coal, flux and soot particles are evenly mixed and then enter the rotary kiln for roasting—pre-reduction. When the roasting temperature is 700°C~800°C, the crystallization water will be released during roasting, and only 0.5% of the crystallization water will be left. ~0.7%, by spraying coal powder into the rotary kiln, the coal powder will generate a reducing atmosphere, reduce some iron, nickel and cobalt oxides in the laterite nickel ore, and control the reduction temperature at about 1000 ° C to prevent the rotary kiln from forming rings. The reduced calcined sand is heated to 900°C, moves toward the tail o...

Embodiment 2

[0037] Such as figure 1 As shown, in this embodiment, on the basis of Example 1, in order to avoid the waste slag generated after smelting from polluting the environment, the waste slag generated during the electric furnace smelting process is treated with slag quenching, and the waste slag is discharged into the slag yard for unified treatment. At the same time, smoke and dust will be generated during the drying of laterite nickel ore and the roasting-pre-reduction process, so dust removal equipment is installed. The dust removal equipment is preferably an electric precipitator. At the same time, in order to avoid air pollution, the dust removal flue gas needs to be desulfurized before being discharged. The dust removal efficiency of the electrostatic precipitator is 99.9%, which meets the emission standards required by environmental protection. After desulfurization treatment, it will not cause acid rain and other hidden dangers. Other parts of this embodiment are the same a...

Embodiment 3

[0039] Such as figure 2 , image 3 As shown, the laterite ore is transported from the raw material warehouse 11 to the drying kiln 7 through the belt conveyor 12 for drying pretreatment, and the laterite nickel ore with a water content of ~20% from the drying kiln 7 enters the batching station 10 for batching, and then enters the rotary kiln 6, and the laterite ore After being roasted, dehydrated and reduced in the rotary kiln 6, it is transported to the electric furnace workshop 8 for high-temperature calcination and casting.

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Abstract

The invention discloses an elevated short-flow process energy-saving RKEF nickel-iron alloy production process, which includes the following steps: (1) drying; (2) batching; (3) roasting-pre-reduction; (4) electric furnace smelting; (5) casting and forming. The invention also discloses an elevated short-process energy-saving RKEF process nickel-iron alloy production equipment, which is mainly composed of a rotary kiln, a drying kiln, an electric furnace workshop, a transfer station, a batching station, and a raw material warehouse. One end of the rotary kiln is connected to the electric furnace workshop, and the other One end is connected to the transfer station, the drying kiln is located below the rotary kiln, one end of the drying kiln is connected to the electric furnace workshop, the transfer station is connected to the batching station at the end far away from the rotary kiln, and the raw material warehouse is close to the drying kiln through a belt conveyor One end of the electric furnace workshop is connected. The invention improves the temperature of entering the furnace by optimizing the design, reduces the power consumption of smelting, makes full use of energy, reduces energy consumption and reduces environmental pollution.

Description

technical field [0001] The invention relates to the field of metallurgy, and specifically refers to an elevated short-flow energy-saving RKEF nickel-iron alloy production equipment and process. Background technique [0002] As a noble metal, nickel has the characteristics of corrosion resistance, oxidation resistance, high mechanical strength, and good ductility. It is an important additive in stainless steel production, especially an indispensable and important raw material for 300 series stainless steel. In recent years, the rapid development of the field of stainless steel has driven the development of ferronickel production enterprises. RKEF process is a classic process for processing laterite nickel ore. In the process of treating laterite nickel ore in the traditional RKEF process, the laterite nickel ore with a water content of 30-40% is dried and pre-reduced, and then sent to an electric furnace for reduction and smelting at a high temperature of about 1550°C to 160...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B4/08C22B4/06C22B1/02
Inventor 费西叶石松周宝清郭建秀高晓军韩涛冉登高游斌李波李宗富周云飞孟立凤赵川杨科朱小波刘茗庹徐成张帆贾伟
Owner 四川省冶金设计研究院
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