Unlock instant, AI-driven research and patent intelligence for your innovation.

Device and method for reducing laterite nickel ore by electric heating rotary kiln

A technology of laterite nickel ore and rotary kiln is applied in the field of devices for reducing laterite nickel ore by using electric heating rotary kiln, which can solve the problem of low metallization rate, little practical guiding significance, incomparable amount of reducing agent and product metallization rate. It can improve the quality and eliminate the secondary oxidation of metallized materials and coke combustion.

Active Publication Date: 2018-11-16
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of this type of rotary kiln to carry out the direct reduction of coal-based rotary kiln is due to the air circulation and oxygen in the air under the high temperature condition of the rotary kiln: 1. The oxidation reaction with the reducing agent method causes the amount of reducing agent required for the metal oxide to be too large; 2. Combined with reducing After the secondary oxidation occurs between the metal object and the oxygen in the air, the metallization rate is low
This is very different from the environment in the industrial rotary kiln in actual production. The amount of reducing agent required and the metallization rate of the product will not be comparable, and the test results will eventually have little significance for practical guidance.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Device and method for reducing laterite nickel ore by electric heating rotary kiln

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The inner diameter of the rotary kiln is 80mm, the length is 1.75m, and the inclination angle of the rotary kiln is 3.5%. Before the improvement of the rotary kiln according to this patent, the laterite nickel ore reduction test is carried out:

[0031] Start the rotary kiln, set the temperature at 1100°C, and rotate at 3r / min, add laterite nickel ore iron-nickel-cobalt oxide and pulverized coal reducing agent into the rotary kiln shell 5 at C / O=1.14, and the iron metallization rate of the reduction product was 63%.

[0032] This patent is implemented in the following way: in the kiln head sealing mechanism, the inner diameter of the thick end of the reducing pipe 6 is 90 mm, the inner diameter of the thin end is 70 mm, and the height of the thin end port baffle is 14 mm; the bearing 7 adopts a thrust angular contact ball bearing 7 (70TAC20X+L); the labyrinth Type friction body: 3 groups, radial gap 3mm, lateral gap 6mm, friction body material is graphite; start the rot...

Embodiment 2

[0034] Under the condition that other conditions remained unchanged, the flow rate of nitrogen filling in Example 1 was adjusted to 1 L / min, and the iron metallization rate of the reduction product was 92.5%.

Embodiment 3

[0036] The inner diameter of the rotary kiln is 100mm, the length is 1.8m, and the inclination angle of the rotary kiln is 4.0%. Before the improvement of the rotary kiln according to this patent, the laterite nickel ore reduction test is carried out:

[0037] Start the rotary kiln, set the temperature at 1100°C, and rotate at 4r / min, add laterite nickel ore iron-nickel-cobalt oxide and pulverized coal reducing agent into the rotary kiln shell 5 at C / O=1.03, and the iron metallization rate of the reduction product 55%.

[0038]This patent is implemented in the following way: in the kiln head sealing mechanism, the inner diameter of the thick end of the reducing pipe 6 is 112mm, the inner diameter of the thin end is 80mm, and the height of the thin end port baffle is 35mm; the bearing 7 adopts a thrust angular contact ball bearing 7 (80TAC20X+L); the labyrinth Type friction body: 4 groups, radial gap 5mm, transverse gap 8mm, friction body material is graphite; start the rotary ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the technical field of novel iron smelting equipment and discloses a device and method for reducing lateritic nickel ore through an electrical heating rotary kiln. The device for reducing the lateritic nickel ore through the electrical heating rotary kiln comprises a rotary kiln cylinder, a kiln tail nitrogen charging and material receiving mechanism and a kiln head sealing mechanism. The kiln tail nitrogen charging and material receiving mechanism comprises a nitrogen charging tube, a sealed tank and a material receiving barrel. The kiln head sealing mechanism comprises a feeding hopper, a reducing pipe, a sealing assembly and a sealed shell. According to the device and method for reducing the lateritic nickel ore through the electrical heating rotary kiln, for the solution of the problem that when the rotary kiln is used for reduction of the lateritic nickel ore, air enters the kiln due to a poor seal performance in the reduction process, and then secondary oxidation of metalized materials and coke combustion happen, the measures that the kiln head is sealed and nitrogen charging is conducted at the kiln tail are taken; and in this way, the problem that air enters the kiln due to the poor seal performance, so that secondary oxidation of the metalized materials and coke combustion happen are effectively eradicated, the quality of the metalized materials obtained after reduction of the lateritic nickel ore is improved, and the powerful equipment guarantee is provided for reduction of the lateritic nickel ore through the rotary kiln.

Description

technical field [0001] The invention relates to the technical field of new ironmaking equipment, in particular to a device and method for reducing laterite nickel ore by using an electric heating rotary kiln. Background technique [0002] Due to the lack of natural gas resources and its priority for petrochemical and civil use, gas-based direct reduction technology is limited in my country. However, my country's coal resources are very rich. This resource condition makes the coal-based direct reduction technology develop rapidly in my country. Among the coal-based direct reduction technologies, the rotary kiln direct reduction technology is the most important process technology. [0003] At present, more and more experts and scholars at home and abroad have conducted research on the efficient utilization of laterite nickel ore. The treatment processes mainly include wet process and fire process. Pressed acid leaching method; fire method includes rotary kiln-electric furnace...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22B23/02
CPCC22B23/023
Inventor 李占军刘功国秦洁齐建玲
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD