Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for optimizing low-grade laterite-nickel ore through gas-coal double-base direct reduction magnetic separation

A kind of laterite nickel ore, low-grade technology, applied in gas-coal double-base direct reduction roasting kiln and mineral selection, gas-coal double-base direct reduction magnetic separation optimization low-grade laterite nickel ore field, can solve the gas-coal double-base shaft furnace process The industrial production and application are frustrated, the nickel recovery rate is not high, the nickel alloy grade is low, and the production efficiency is low, which achieves the effect of easy promotion, huge energy-saving development potential, and reduced investment.

Pending Publication Date: 2021-11-26
张雷
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional process for processing nickel oxide ore is pyrometallurgy of nickel-iron alloy. This process mainly deals with metamorphic peridotite with high nickel grade. According to different reduction processes, it is divided into rotary kiln pre-reduction and shaft furnace reduction-submerged thermal electric furnace-refining method. However, the rotary kiln pre-reduction and the shaft furnace reduction do not constitute the direct and sufficient reduction atmosphere required by the laterite nickel ore due to the dilution of the flue gas to the reduction gas. Both of them increase the temperature for reduction, resulting in difficult thermal control and high-temperature bonding and agglomeration. , high energy consumption, low production efficiency, unstable production and other problems; the nickel recovery rate and nickel alloy grade are not high; resulting in repeated setbacks in the industrial production and application of the gas-coal double-base shaft furnace process

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
  • Method for optimizing low-grade laterite-nickel ore through gas-coal double-base direct reduction magnetic separation
  • Method for optimizing low-grade laterite-nickel ore through gas-coal double-base direct reduction magnetic separation
  • Method for optimizing low-grade laterite-nickel ore through gas-coal double-base direct reduction magnetic separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] A laterite nickel ore contains 0.85% Ni and 46.37% Fe. Follow these steps:

[0102] ①Raw material treatment: Ni0.85%, Fe46.37% low-grade laterite nickel ore raw materials and reducing agent coal were screened, granulated, and dried to obtain laterite nickel ore particles with a particle size of 3-40 mm and laterite nickel ore particles with a particle size of 5-10 mm. Millimeter coal particles, mix 5-10 mm coal particles in a proportion of 8%, and a particle size of 1-5 mm in proportion to 6% of re-used coal particles and 3-40 mm laterite nickel ore particles to obtain a mixed material, the weight percentage of the mixed material moisture <10%.

[0103] ②Gas-coal double-base direct reduction roasting: Roast 3-40mm nickel ore particle mixture in the gas-coal double-base direct reduction roasting test kiln, the gas-base reducing gas pressure is controlled at 600-1200Pa higher than the marked pressure, and the reduction section reduces The temperature is controlled at ab...

Embodiment 2

[0110] Ni0.97% and Fe49.41% of a low-grade lateritic nickel ore. Follow these steps:

[0111] ①Raw material processing: Ni0.97%, Fe49.41% low-grade laterite nickel ore raw materials and reducing agent coal were screened, granulated and dried to obtain laterite nickel ore particles with a particle size of 3 to 40 mm and laterite nickel ore particles with a particle size of 5 to 10 mm. Millimeter coal particles, mix 5-10 mm coal particles in a proportion of 8%, and a particle size of 1-5 mm in proportion to 6% of re-used coal particles and 3-40 mm laterite nickel ore particles to obtain a mixed material, the weight percentage of the mixed material moisture <10%.

[0112] ②Gas-coal double-base direct reduction roasting: Roast 3-40mm nickel ore particle mixture in the gas-coal double-base direct reduction roasting test kiln, the pressure of gas-base reducing gas is controlled at 600-1200Pa higher than the marked pressure, and the reduction section reduces The temperature is cont...

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

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of energy-saving comprehensive utilization of mineral resources, in particular to a method for optimizing low-grade laterite-nickel ore through gas-coal double-base direct reduction magnetic separation. The method comprises the following specific steps of raw material treatment, carrying out reduction roasting on a material and reduction coal mixture by using a gas-coal double-base direct reduction roasting kiln; cooling a laterite-nickel ore particle material subjected to reduction roasting and sequentially passes through a coal separation recycling system, a double-roller grinding system, a Raymond grinding system and a magnetic separation system to obtain a nickel alloy product, and the mass percent of nickel contained in the nickel alloy product is that Ni is greater than 8%. According to the method, the problems of low reduction efficiency, long reduction heating time, high heating temperature and poor heat preservation effect in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of energy-saving comprehensive utilization of mineral resources direct reduction, and relates to a gas-coal double-base direct reduction roasting kiln and a mineral optimization method; in particular, it relates to a gas-coal double-base direct reduction magnetic separation method for optimizing low-grade laterite nickel ore. Background technique [0002] Nickel has the characteristics of strong corrosion resistance and good heat resistance, and has been widely used in various fields such as stainless steel and special alloy steel; at present, 60% of nickel metal in the world is extracted from nickel sulfide ore, and its production process is mature, but Nickel sulfide ore resources are decreasing day by day. With the rapid development of the stainless steel industry, the demand for nickel is also increasing. The development and utilization of laterite nickel oxide ore, which accounts for 70% of the earth's n...

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
IPC IPC(8): C22B1/02C22B5/12C22B23/02
CPCC22B1/02C22B5/12C22B23/005C22B23/021Y02P10/20
Inventor 张雷张凯玮张妍琪
Owner 张雷
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com