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Process for smelting ferronickel in tunnel kiln

A technology of tunnel kiln and ferronickel, which is applied in the field of smelting ferronickel, can solve the problems of unscalable production of ferronickel, low production efficiency, low carbonization rate, etc., and achieve low production cost, convenient construction, and less harmful impurity content Effect

Inactive Publication Date: 2010-11-24
SHANDONG TAISHAN STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Charcoal is used as a reducing agent, but it is mainly fired in earthen kilns. Not only the carbonization rate is low, the calorific value is low, but also the production efficiency is low, and the production of ferronickel cannot reach scale.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The laterite nickel ore is transported to the batching room of the ferronickel production workshop as raw materials for production; according to the planned production scale of ferronickel, the carbon consumption is determined, charcoal is made from wood, and the burned charcoal is processed to make the required particle size and sent to the batching workshop as Reducing agent, the gas produced during the charcoal making process is sent to the tunnel kiln as a reducing atmosphere gas and fuel gas. In the batching room, the laterite nickel ore, charcoal, limestone and smelting additives are mixed according to the mass ratio of 1:0.3:0.03:0.01. Additives mainly play the role of agglomerating the mixture and improving the quality of the finished product. After mixing, it is loaded into a tunnel kiln for preheating, drying, reduction, and cooling. The preheating drying temperature is 900°C and the time is 2 hours; the reduction temperature is 1250°C and the time is 6 ho...

Embodiment 2

[0015] Using wood to make charcoal, the burned charcoal is processed and processed to make the required particle size and sent to the batching workshop as a reducing agent. The gas generated during the charcoal making process is sent to the tunnel kiln as a reducing atmosphere gas and fuel gas. In the batching room, the laterite nickel ore, charcoal, limestone and smelting additives are mixed according to the mass ratio of 1:0.5:0.05:0.02. Additives mainly play the role of agglomerating the mixture and improving the quality of the finished product. After mixing, it is loaded into a tunnel kiln for preheating, drying, reduction, and cooling. The preheating drying temperature is 700°C and the time is 3 hours; the reduction temperature is 1400°C and the time is 4 hours; the cooling temperature is 500°C and the time is 5 hours. After exiting the kiln, the red-hot calcined block is quenched in water, and then sent to the mill for grinding to precipitate the granular iron embedded i...

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Abstract

The invention discloses a process for smelting ferronickel in a tunnel kiln. The process comprises the following steps of: preparing burnt charcoal into charcoal particles with required particle sizes, feeding gas produced in a charcoal preparing process into the tunnel kiln and taking the gas as reducing atmosphere gas and fuel gas; and mixing laterite-nickel ore, charcoal, limestone and a smelting additive according to a certain proportion in a batching room, loading the mixture, feeding the loaded mixture into the tunnel kiln, preheating, drying, reducing and cooling the mixture in the tunnel kiln, discharging the treated mixture out of the kiln, quenching the discharged mixture and grinding and sorting the quenched mixture. Because the charcoal is taken as a reducing agent, charcoal resource is rich, the components of the charcoal are superior to those of coke and anthracite, harmful impurity content is low and obtained ferronickel has few impurities. The process has the characteristics of solving the problem of fuel gas for industrial production, taking fuel gas produced in a charcoal burning process as reducing gas and fuel gas for production, making full use of energy sources and optimizing energy utilization along with easy implementation and low energy consumption.

Description

technical field [0001] The invention relates to a process for smelting ferronickel, belonging to the technical field of metal smelting. Background technique [0002] About 70 million tons of nickel metal resources have been discovered in the world so far. Among them, nickel sulfide is about 30 million tons, accounting for 42%. The rest are laterite-type nickel oxide. Laterite nickel ore has the characteristics of low proportion of available value, high water content, low Ni and Fe content, and high Si impurity content. Generally, the water content of laterite nickel ore (natural water and crystal water) is about 30-50%, Ni=0.9-2.5%, Fe=13-50%. At present, there are mainly the following types of laterite nickel ore to smelt ferronickel: 1. Blast furnace method: Ni=0.9~1.1%, Fe≥48% laterite nickel ore is suitable for producing low-nickel iron with nickel content of 1.5-1.9%; 1.7%, Fe≥20% laterite nickel ore is suitable for blast furnace production of 3-6% low-nickel iron;...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/00C22C38/08C21B13/00
Inventor 王永胜高振民陈培敦孙式超杜义亮刘祥银房洪杰高寿莲
Owner SHANDONG TAISHAN STEEL GROUP
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