Method for recovering nickel, cobalt and iron from laterite-nickel ore

A laterite nickel ore and slurry technology, applied in the hydrometallurgical process of laterite nickel ore, can solve the problems of high acid consumption, low nickel and cobalt leaching rate, low operating rate, etc., and achieve low investment cost, simple operation and maintenance , the effect of low operating costs

Inactive Publication Date: 2015-07-15
JINCHUAN GROUP LIMITED
View PDF13 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method has the following disadvantages and deficiencies: First, the time for leaching limonite under normal pressure is longer, usually more than 4 hours, so the required normal pressure leaching equipment is huge; the second is that the acid consumption is higher, and the total acid / ore=0.6 / 1. Although this acid consumption index is far lower than atmospheric acid leaching, it is much higher than high-pressure acid leaching; third, the amount of saprolite ore used is twice that of limonite, which also contradicts the ore belt composition of laterite ore , it is well known that in lateritic nickel deposits, the amount of limonite: the amount of saprolite ≥ 2:1
[0019] In short, in the above-mentioned invention patents of lateritic nickel ore wet smelting, the disadvantages of the high-pressure acid leaching (HPAL) process and the improved high-pressure acid leaching process are: complex high-temperature, high-pressure autoclaves and related equipment are required, and their installation and Both are expensive to maintain; the HPAL process consumes more sulfuric acid than is required to stoichiometrically dissolve the non-ferrous components of the ore; the HPAL process is limited to processing mainly limonite-type feedstock; the HPAL process operates at high pressure The kettle is prone to fouling, and needs to be shut down regularly for cleaning, and the operating rate is low
The disadvantages of the atmospheric pressure acid leaching process and the improved atmospheric pressure acid leaching process are: high sulfuric acid consumption; low nickel and cobalt leaching rates; long reaction time and huge equipment required
The common disadvantage of high-pressure acid leaching including improved high-pressure acid leaching process and atmospheric pressure acid leaching process including improved atmospheric pressure acid leaching process is that the amount of leaching slag is large, and it is a mixed slag of silicon and iron, so that the main component of laterite ore, iron, cannot Economical and effective development and utilization
Although the invention patent of CN102206749A mentions the recycling of leaching slag, since the silicon dioxide, iron oxide, goethite, etc. Simple magnetic separation and other methods separate them, so the economic benefits of the development and utilization of the above-mentioned leaching slag are very poor, and they can only be treated as waste solids, and even the leaching slag with a low nickel leaching rate must be treated as hazardous waste.

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 recovering nickel, cobalt and iron from laterite-nickel ore
  • Method for recovering nickel, cobalt and iron from laterite-nickel ore
  • Method for recovering nickel, cobalt and iron from laterite-nickel ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The present invention will be further described below, as appended figure 1 Shown:

[0034] 1. Take and grind to -80 mesh 500Kg2 # Add 500Kg water to saprolite ore to make saprolite slurry, prepare 500Kg98% concentrated sulfuric acid for use;

[0035] 2. Use a mortar pump and a concentrated sulfuric acid pump to strictly control the flow rate. The saprolite slurry and concentrated sulfuric acid are quickly mixed and then flowed into the steel-lined alloy reaction tank. The entire reaction takes 12 minutes. After the reaction, the material is a loose honeycomb solid paste. stand-by;

[0036] 3. After cooling down, simply crush the reaction material of the crisp honeycomb solid paste and pour it into the water immersion tank, add 1500Kg of water, carry out the water dissolving step, and stir for about 30 minutes;

[0037] 4. Pump the water-soluble slurry into the plate and frame filter press for solid-liquid separation and filter residue washing, and the pH value ratio...

Embodiment 2

[0051] 1. Take and grind to -80 mesh 500Kg5 # Add 500Kg water to saprolite ore to make saprolite slurry, prepare 450Kg98% concentrated sulfuric acid for use;

[0052] 2. Strictly control the flow rate with a mortar pump and a concentrated sulfuric acid pump. The saprolite slurry and concentrated sulfuric acid are quickly mixed and then flowed into the steel-lined alloy reaction tank. The entire reaction takes 10 minutes. After the reaction, the material is a loose honeycomb solid paste. stand-by;

[0053] 3. After cooling down, simply crush the reaction material of the crisp honeycomb solid paste and pour it into the water immersion tank, add 1500Kg of water, carry out the water dissolving step, and stir for about 30 minutes;

[0054] 4. Pump the water-soluble slurry into the plate and frame filter press for solid-liquid separation and filter residue washing, and the pH value ratio is controlled at 0.5; obtain 230Kg of normal pressure acid leaching filter residue (A2), 1500L ...

Embodiment 3

[0066] The normal-pressure acid leaching stage of the present embodiment is the same as that of Example 1, and in the pressure leaching stage, 1 # Sinka Limonite changed to 4 # Indonesian limonite.

[0067] Take 3000g4 # For limonite, add washing solution (E1) 6000ml to be mixed with limonite slurry and then move it into the autoclave, then add 3000ml of normal pressure acid leaching filtrate (B1) into the autoclave. After sealing the autoclave, control the temperature and heat. When the temperature rises to 215° C., continue heating at a constant temperature for 50 minutes, then stop heating and cool down. After cooling down to 80°C, the reaction slurry was removed from the autoclave for solid-liquid separation and the filter residue was washed to obtain 2800g of pressurized leaching residue (C3), 7550ml of pressurized leaching solution (D3) and 4500ml of washing solution (F3). See Table 3-1, Table 3-2 and Table 3-3 for the components of pressure leaching residue (C3), pre...

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 wet metallurgy of laterite-nickel ore, and concretely relates to a method for recovering nickel, cobalt and iron from laterite-nickel ore. The method comprises the following steps: adding enough concentrated sulfuric acid into a saprolite ore slurry, and reacting at a high temperature of 95-120DEG C to dissolve most soluble non-ferrous metals and soluble iron; carrying out solid-liquid separation to obtain normal pressure leached slag and normal pressure leachate; adding the normal pressure leachate and a limonite ore slurry into a pressure reactor in proportion, and carrying out pressure leaching at 195-240DEG C; carrying out solid-liquid separation to obtain pressure leached slag and pressure leachate; purifying the pressure leachate to recover nickel and cobalt; washing the pressure leached slag, and drying to obtain a fine iron powder product; and processing the normal pressure leached slag to obtain a high grade silica product and building sand. The method has the advantages of simultaneous treatment of saprolite and limonite, high nickel and cobalt recovery rate, realization of small size, short time and high efficiency of a normal pressure leaching device, and realization of small amount and effective utilization of waste slag.

Description

technical field [0001] The present invention relates to the hydrometallurgical process of lateritic nickel ore, in particular, it relates to carrying out sulfuric acid atmospheric pressure leaching of saprolite components of this ore and pressure leaching of limonite components with normal pressure leachate in the same process, While recovering nickel and cobalt, economically and effectively recover the main components of iron and part of the ore. Background technique [0002] Laterite ore is a nickel oxide ore formed by nickel-bearing peridotite after large-scale long-term weathering and leaching metamorphism in tropical or subtropical regions. Due to differences in geographical location, climatic conditions and weathering degrees, the types of laterite ore around the world are not completely the same People subjectively divide the laterite deposit into three layers from top to bottom, namely limonite layer, transitional layer and saprolite layer, in which limonite has fine...

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 Applications(China)
IPC IPC(8): C22B3/06C22B23/00
CPCY02P10/20
Inventor 杨志强刘玉强王少华许永武沙滨杜昊王纪华姚菲唐金贺小红
Owner JINCHUAN GROUP LIMITED
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap