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Method for producing ferronickel by direct reduction in high-efficiency cascade split rotary reduction furnace

A bifurcated, reduction furnace technology, applied in the field of non-ferrous metal metallurgy, can solve the problems affecting the production process, downtime maintenance, and production continuity, so as to improve the recovery rate of ferronickel, save smelting costs, and achieve continuity. Effect

Inactive Publication Date: 2017-09-26
李宾
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, the biggest problem with the rotary kiln process is the ring formation problem during the smelting process. In order to clean the ring formation, the rotary kiln has to be shut down for maintenance on average for half a month to a month (up to two months), and can only continue after the formation is removed. Production, which has a great impact on the continuity of production and seriously affects the production process. The existing solutions are all efforts to optimize the reduction temperature and the proportion of the reducing agent. Solve the problem that the production process is discontinuous due to the ring formation of the rotary kiln (the cycle of removing the ring is more than 15 days and seriously damages the refractory material of the rotary kiln), and the problem of frequent shutdown and maintenance is required

Method used

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  • Method for producing ferronickel by direct reduction in high-efficiency cascade split rotary reduction furnace
  • Method for producing ferronickel by direct reduction in high-efficiency cascade split rotary reduction furnace
  • Method for producing ferronickel by direct reduction in high-efficiency cascade split rotary reduction furnace

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Embodiment 1

[0057] Example 1 Test equipment

[0058] The main equipment used in the present invention: high-efficiency cascade split type rotary reduction furnace: main kiln body ∮5m×60m, of which the drying section is 40m, the pre-reduction section is 20m, the auxiliary kiln body is ∮5m×20m, and the smelting section is 20m; the auxiliary equipment consists of 250× 150mm jaw crusher, ∮1500mm disc granulator, flue gas dust collection system, Testo360 flue gas tester, terminal control system, etc.

[0059] Such as Figure 1 to Figure 6 As shown, a high-efficiency cascade-split rotary reduction furnace for smelting nickel-iron from nickel laterite ore provided by the present invention includes: a main kiln body 1, two auxiliary kiln bodies 2, and a cascade split-type main support 6; Wherein, the main kiln body 1 is supported by the main kiln body support group 3, and the main kiln body support group 3 is provided with a supporting wheel 7, which is engaged with the large ring gear 9 sleeved...

Embodiment 2

[0065] Saprotic rock type lateritic nickel ore (high nickel) in BAHODOPI mining area, Indonesia, with an average content of Ni 1.76wt%, Co 0.04wt%, Fe 18.21wt%, SiO 2 35.18wt%, MgO 19.88wt%, water content 35wt%.

[0066] Process steps: screen and crush the laterite nickel ore wet ore to less than 80mm, send it to the dryer for drying treatment, until the water content accounts for 18wt% of the total weight of the laterite nickel ore, and then screen and crush until the particle size of the laterite nickel ore is less than 3mm. More than 80%; mix laterite nickel ore with solid fuel (anthracite powder), flux (limestone powder and dolomite powder) according to the ratio in Table 1, and the disc granulator has a compaction of 20mm, and sends it into a high-efficiency cascade split rotary The main kiln body of the reduction furnace is dehydrated in the drying section, the temperature is 500°C, and the drying time is 70 minutes; then it enters the pre-reduction section for pre-redu...

Embodiment 3

[0078] Saprotic rock type laterite nickel ore (high iron) in Indonesia's BAHODOPI mining area, the ore contains an average of Ni 0.9wt%, Co0.1wt%, Fe48.19wt%, SiO 2 4.87wt%, MgO 1.16wt%, water content 34.8%.

[0079]Process steps: screen and crush the laterite nickel ore wet ore to less than 80mm, send it to the dryer for drying treatment, until the water content accounts for 17.8wt% of the total weight of the laterite nickel ore, and then screen and crush the laterite nickel ore until the particle size of the laterite nickel ore is less than 3mm Accounting for more than 80%; laterite nickel ore, solid fuel (anthracite powder), flux (limestone powder and dolomite powder) are mixed according to the ratio in Table 5, and the compaction of the disc granulator is 20mm. The main kiln body of the rotary reduction furnace is dehydrated in the drying section with a temperature of 600°C and a drying time of 50 minutes; then enters the pre-reduction section for pre-reduction at a tempe...

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Abstract

A method for producing ferronickel by means of a high efficiency step forking type rotary reduction furnace in a direct reduction manner, comprising the steps of: sieving laterite nickel ore raw material, adding pulverized coal and an additive for mixing, pressing the mixture into balls, feeding the balls into a main kiln body of a rotary kiln for water removal, carrying out material pre-reduction, and then feeding the material into auxiliary kiln bodies to be smelted. The rotary reduction furnace comprises: the main kiln body (1), two auxiliary kiln bodies (2), and a step forking type main holder (6). A control gate (15) capable of swinging left and right is arranged in the step forking type main holder (6) and is used for controlling the conveying direction of the pre-reduced material. A block dam is built in the kiln to enhance agitation and heat transfer of the material. By means of the high efficiency step forking type rotary reduction furnace, the problem that continuous production cannot be achieved due to ring formation during smelting in the rotary kiln is solved. When one auxiliary kiln body shuts down for maintenance, the other (standby) auxiliary kiln body promptly resumes the smelting, and thus continuous production in the pipeline for directly reducing ferronickel is not affected.

Description

technical field [0001] The invention belongs to the field of nonferrous metal metallurgy, and in particular relates to a method for producing ferronickel through direct reduction in a high-efficiency cascade-split rotary reduction furnace. Background technique [0002] Laterite nickel ore accounts for more than 70% of the world's nickel resources, and its storage capacity is much larger than that of sulfide ore. It has resource advantages. In recent years, few large-scale nickel sulfide ores have been discovered; it is inevitable to increase the development of laterite nickel ore. [0003] In 2010, the world's nickel consumption was 1.464 million tons, and China's nickel consumption was 534,000 tons, accounting for about 36% of the global nickel consumption. Nickel consumption is increasingly used in various industries, especially in stainless steel production applications accounting for 60%. The use of stainless steel is becoming more and more extensive, and the proportion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B23/02C22B1/02C21B11/06
CPCC21B11/06C22B1/02C22B23/02
Inventor 李宾
Owner 李宾