Technology of direct reduction of nickel-iron particles from laterite-nickel ores in rotary kiln

A laterite nickel ore and rotary kiln technology, applied in the field of metallurgical technology, can solve the problems of shortening the life of refractory kiln lining, poor operability, and high requirements for refractory materials, so as to facilitate reduction and enrichment, improve reduction efficiency, and slow down the travel speed Effect

Active Publication Date: 2017-05-24
BAOSTEEL DESHENG STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high temperature conditions have high requirements on the refractory materials of the rotary kiln, which shortens the life of the refractory kiln lining, and the temperature in the kiln is not easy to control, and the operability in production is poor. The caliber is large

Method used

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  • Technology of direct reduction of nickel-iron particles from laterite-nickel ores in rotary kiln
  • Technology of direct reduction of nickel-iron particles from laterite-nickel ores in rotary kiln
  • Technology of direct reduction of nickel-iron particles from laterite-nickel ores in rotary kiln

Examples

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Effect test

Embodiment 1

[0021] A kind of technology that rotary kiln directly reduces laterite nickel ore ferronickel particle, it comprises the following steps:

[0022] 1) Batching and pelletizing: After mixing the dried and crushed laterite nickel ore with carbonaceous reducing agent, limestone and binder, the balls are pressed on a briquetting machine to form mixed pellets. The laterite nickel ore, carbonaceous The dosage ratio of reducing agent, limestone and binder is 84.5:13:2:0.5;

[0023] 2) Reduction roasting: Send the mixed pellets into the rotary kiln for roasting, such as figure 1 and figure 2 As shown, the rotary kiln is provided with a preheating section 10, a transition section 20 and a firing section 30 from the kiln tail 1 to the kiln mouth 2. The kiln mouth 2 of the rotary kiln is a necking structure, and the necking section The length of the rotary kiln is 5m, the temperature of the preheating section in the rotary kiln is 400-650°C, the temperature of the transition section is...

Embodiment 2-7

[0027] Examples 2-7 take the same steps as in Example 1, the difference lies in the proportion of raw materials used in step 1) in the mixed pellets, and the temperature of each stage in the reduction roasting process is different. The specific data are shown in Table 1:

[0028] Table 1

[0029]

[0030] The water quenching and beneficiation steps of the present invention are prior art, the binder is a commercially available product, and its composition will not be described in detail here; the carbonaceous reducing agent is any one of coke powder, anthracite or semi-coke; Such as figure 1 and figure 2 As shown, the rotary kiln of the present invention includes a kiln tail 1 and a kiln mouth 2, and the kiln mouth 2 is a necking structure, wherein, the length of the necking in Example 1 is 5m, and the diameter D of the front end 21 of the necking is 3.44 m, the diameter H of the necking rear end 22 is 4.85m; the length of the firing section is 30m, in actual production, ...

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Abstract

The invention discloses a technology of direct reduction of nickel-iron particles from laterite-nickel ores in a rotary kiln, comprising the steps of mixing the laterite-nickel ores, carbon reductant and limestone, then briquetting the mixtures into mixed pellets on a briquetting machine; sintering the mixed pellets through a preheating section and removing crystal water in the rotary kiln, reducing nickel elements at a transition section, and then entering into a sintering section to reduce iron elements and the nickel elements and metal particles grow up. Wherein, the temperature of the sintering section near the transition section is controlled within such scope that the materials are kept in solid state, and the kiln ringing can be prevented while keeping the metal reduction temperature; the temperature of the sintering section located at a kilneye is controlled within such scope that the materials are kept in half-molten state. Since the kilneye of the rotary kiln is in a throat structure, heat is uneasy to dissipate, in favor of reduction and enrichment of metal; even sometimes minor ringing occurs, the previous ringing can also be easily removed under the rolling effect of subsequent materials, so that the technology disclosed by the invention plays a foundation for continuous production of direct reduction, and the reduction efficiency of the rotary kiln is improved.

Description

technical field [0001] The invention relates to the technical field of metallurgical technology, in particular to a technology for directly reducing nickel-iron particles of laterite nickel ore in a rotary kiln. Background technique [0002] As a strategic element, nickel plays an extremely important role in the development of the national economy. About 2 / 3 of the world's nickel is used to produce stainless steel, and the cost of nickel raw materials accounts for about 70% of the production cost of austenitic stainless steel. In recent years, in order to reduce the production cost of stainless steel, stainless steel enterprises have begun to use a large amount of nickel-containing pig iron. [0003] At present, nickel-containing pig iron is smelted with laterite nickel ore containing 0.8-2.0% nickel as raw material. The smelting process of laterite nickel ore includes blast furnace, RKEF process, and rotary kiln direct reduction method. Among them, the rotary kiln direct ...

Claims

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Application Information

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IPC IPC(8): C22B23/02C22B1/02C22B1/242
CPCC22B1/02C22B1/242C22B23/021C22B23/023
Inventor 崔慧军
Owner BAOSTEEL DESHENG STAINLESS STEEL
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