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Production method through combined treatment of laterite by direct current electric furnace

A technology of laterite nickel ore and combined processing is applied in the field of non-ferrous metal metallurgy to achieve the effects of good technical and economic indicators, reduced energy consumption and sufficient reaction.

Inactive Publication Date: 2012-06-13
云锡元江镍业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its process flow is simple, equipment investment is low, and it can solve the problems of direct feeding of high-temperature materials into the furnace and make full use of the sensible heat of materials, further reduce energy consumption, and significantly improve the economical efficiency of processing low-grade laterite nickel ore

Method used

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  • Production method through combined treatment of laterite by direct current electric furnace
  • Production method through combined treatment of laterite by direct current electric furnace
  • Production method through combined treatment of laterite by direct current electric furnace

Examples

Experimental program
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Embodiment 1

[0014] Embodiment 1: As shown in Figure 1, the specific operation of this embodiment is as follows. The laterite nickel ore is crushed by ore grinding equipment, and its particle size is required to be 10mm to 80mm, and then mixed with anthracite with a particle size of 20 to 40mm (anthracite accounts for 1 to 16% of the weight of the hot material), and then sent to the rotary kiln for drying and pre-reduction , the CO content in the tail gas of the rotary kiln is controlled at 0.5% to 0.8% of the total weight of the materials in the kiln, the temperature in the kiln is 700°C to 1050°C, the roasting time is 0.5 to 2.0h, and then the pre-reduced hot materials (750°C) are directly sent to Smelted in a direct-current submerged thermal electric furnace (smelting temperature: 1450-1650°C), and finally produces ferronickel products containing 8-12% nickel, with a nickel recovery rate of over 85%.

[0015] The technical performance parameters of DC electric furnace are shown in the t...

Embodiment 2

[0017] Embodiment 2: The specific operation method of this embodiment is basically the same as that of Example 1, the difference is that before the laterite nickel ore enters the kiln, it is mixed with coke with a particle size of 20 mm (the coke accounts for 8 to 16% of the weight of the heated material ), to strengthen the reducing atmosphere in the kiln, the CO content of the rotary kiln tail gas is controlled at 0.8% to 1% of the total weight of the kiln material, the temperature in the kiln is 700°C to 1150°C, the roasting time is 0.5 to 2.0h, and then the pre-reduction The post-heated material (800-850°C) is directly fed into the direct-current submerged thermal electric furnace for smelting (melting temperature: 1450-1650°C), and finally produces ferronickel products containing 8-12% nickel. The nickel recovery rate is over 90%, and the slag rate is 80% (the slag contains less than 0.1% nickel).

Embodiment 3

[0018] Embodiment 3: As shown in Figure 2, the specific operation process of this embodiment is as shown in the figure. It differs from Embodiment 1 in that: after the laterite nickel ore is calcined and pre-reduced in a rotary kiln, it is added with a particle size of < 20mm of sulfur, the amount of sulfur added accounts for 4.5% of the weight of the hot material, and the melting temperature in the furnace is adjusted to 1200-1400°C to finally obtain the nickel matte product. The product contains 8-11% nickel, 20-22% sulfur, and 80-85% nickel recovery.

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Abstract

The invention belongs to the field of metallurgy of nonferrous metal, and particularly relates to a method for producing ferronickel or nickel matte through combined treatment of laterite by a rotary kiln and a direct current electric furnace. The method comprises the following steps of: adding the crushed laterite with granularity of 10-80 mm into a carbon reducing agent in an amount which is 1-16 percent by weight of the laterite; feeding into the rotary kiln for drying and pre-reducing; controlling tail gas CO content of the rotary kiln within a range of 0.5 percent to 1 percent of the total weight of materials in the kiln, temperature in the kiln within the range of 700 DEG C to 1,150 DEG C and roasting time within the range of 0.5 h to 2.0 h; and directly feeding pre-reduced hot materials into a direct currentore-smelting electric furnace for smelting to produce ferronickel or nickel matte. The method has the advantages of simple process flow, saving in equipment investment and capabilities of solving the problems of full utilization of material sensible heat and the like due to direct feeding of the high-temperature materials into the furnace, further reducing energy consumption and obviously improving economy of treating low-grade laterite.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal metallurgy, and in particular relates to a method for jointly treating laterite nickel ore with a rotary kiln and a direct current electric furnace to produce ferronickel or nickel matte. Background technique [0002] At present, there are roughly three types of nickel oxide ore treatment processes in the world, namely pyrotechnics, wet processes and combined fire-wet processes. The wet process can be divided into ammonia leaching process and pressure acid leaching process according to the different leaching solutions. Among them, the ammonia leaching process is not suitable for treating laterite nickel oxide ore with high copper and cobalt content, and the pressure acid leaching process is only suitable for treating laterite nickel oxide ore with low magnesium content, and large-scale production faces huge environmental pressure. The fire-wet combination process mainly includes reduction roastin...

Claims

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Application Information

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IPC IPC(8): C22B4/06C22B1/00C22B23/02C21B11/10
Inventor 王炜唐瑞祥陈光云董建勇董瀚黄迎红聂光旭
Owner 云锡元江镍业有限责任公司
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