Limonite hydrometallurgy process

A technology of hydrometallurgy and limonite, which is applied in the field of metallurgy, can solve the problems that iron cannot be economically and effectively developed and utilized, the leaching rate of nickel and cobalt is low, and it can only be treated as waste solid, so as to achieve efficient development and utilization and consumption of sulfuric acid The effect of low quantity and avoiding expensive equipment

Inactive Publication Date: 2015-11-18
JINCHUAN GROUP LIMITED
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In short, in the invention patent of laterite nickel ore wet smelting, the disadvantages of the high pressure acid leaching (HPAL) process and the improved high pressure acid leaching process are: the need for complex high temperature, high pressure autoclave and related equipment, its installation and maintenance Both are expensive; the HPAL process consumes more sulfuric acid than is required to stoichiometrically dissolve the non-ferrous components of the ore
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

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  • Limonite hydrometallurgy process
  • Limonite hydrometallurgy process
  • Limonite hydrometallurgy process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Washing and classifying limonite ore, separating coarser minerals such as gravel and sandstone in limonite from the raw ore to obtain high-silicon-magnesium ore and low-silicon-magnesium ore;

[0030] 2. Set +80 purpose 2 # 500kg of high-silicon magnesium ore plus 500kg of water is prepared to obtain 50wt% ore slurry, which is for use;

[0031] 3. Simultaneously add 450kg of 98% concentrated sulfuric acid heated to 150°C to the double-screw pusher reactor and step 2 to prepare 50wt% ore pulp heated to 60°C. After mixing, it will be pushed out by the double-screw pusher reactor for the entire reaction time After 10 minutes, the material released by the double-screw pusher reactor is a crisp honeycomb solid paste, ready for use;

[0032] 4. Simply crush the crisp honeycomb solid paste obtained in step 3, pour it into a water immersion tank after crushing, add water equal to the weight of the crisp honeycomb solid paste, carry out the water dissolving step, and stir fo...

Embodiment 2

[0045] 1. Take the limonite ore for washing and classification, separate coarser minerals such as gravel and sandstone in the limonite from the raw ore, and pass through an 80-mesh sieve to obtain +80-mesh ore and -80-mesh ore;

[0046] 2. Put +80 mesh 5 # Add water to high silicon magnesium ore to prepare 50wt% ore slurry, stand-by;

[0047] 3. Simultaneously add 450kg of 98% concentrated sulfuric acid heated to 150°C to the double-screw pusher reactor and step 2 to prepare 50wt% ore pulp heated to 60°C. After mixing, it will be pushed out by the double-screw pusher reactor for the entire reaction time After 10 minutes, the material released by the double-screw pusher reactor is a crisp honeycomb solid paste, ready for use;

[0048] 4. Simply crush the crisp honeycomb solid paste obtained in step 3, pour it into a water immersion tank after crushing, add water equal in weight to the crisp honeycomb solid paste, carry out the water-dissolving step, and stir for 30 minutes;

...

Embodiment 3

[0060] 1. Take the limonite ore for washing and classification, separate coarser minerals such as gravel and sandstone in the limonite from the raw ore, and pass through an 80-mesh sieve to obtain +80-mesh ore and -80-mesh ore;

[0061] 2. Set +80 purpose 2 # 500kg of high-silicon magnesium ore plus 500kg of water is prepared to obtain 50wt% ore slurry, which is for use;

[0062] 3. Simultaneously add 450kg of 98% concentrated sulfuric acid heated to 150°C to the double-screw pusher reactor and step 2 to prepare 50wt% ore pulp heated to 60°C. After mixing, it will be pushed out by the double-screw pusher reactor for the entire reaction time After 10 minutes, the material released by the double-screw pusher reactor is a crisp honeycomb solid paste, ready for use;

[0063] 4. Simply crush the crisp honeycomb solid paste obtained in step 3, pour it into a water immersion tank after crushing, add water equal to the weight of the crisp honeycomb solid paste, carry out the water di...

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Abstract

The present invention discloses a limonite hydrometallurgy process, and belongs to the field of metallurgy. According to the process, washing grading is performed on limonite to obtain high-silicon-magnesium ore and low-silicon-magnesium and high-iron ore; the high-silicon-magnesium ore slurry and sufficient concentrated sulfuric acid are concurrently added to a twin screw material pushing reactor so as to dissolve most of soluble non-ferrous metals and soluble iron; solid-liquid separation is performed to obtain normal pressure leaching residue and a normal pressure leaching solution; the normal pressure leaching solution and the low-silicon-magnesium and high-iron ore slurry are added to a pressurization kettle according to a certain ratio to be subjected to pressurization leaching; solid-liquid separation is performed to obtain pressurization leaching residue and a pressurization leaching solution; and the pressurization leaching solution filtrate is purified to obtain the iron fine powder product. According to the present invention, the process has advantages of high nickel and cobalt leaching rate, low sulfuric acid consumption, short reaction time and high production efficiency; the pressurization leaching equipment is the medium-low pressure equipment, such that the disadvantages of high price and easy scaling of the high pressure kettle are avoided; and the main component iron in the ore can be economically and effectively recovered and effectively utilized, and the waste residue is less.

Description

technical field [0001] The invention relates to a process for leaching high-silicon-magnesium ore components of limonite at normal pressure with sulfuric acid and pressure-leaching low-silicon-magnesium-high-iron components with normal-pressure leaching liquid, belonging to the field of metallurgy, and in particular to a limonite wet metallurgical process. 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 . [0003] The weathering process generally produces layered deposits in which complete or most complete weathering is present near the surface, gradually becoming less weathered with increasing depth, and finally terminating at some deeper depth as unweathered rock...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/08C22B23/00C22B26/22C01B33/023
CPCY02P10/20
Inventor 于衍芬沙滨刘玉强刘召霞许永武刘世和杜昊马永刚刘静王少华
Owner JINCHUAN GROUP LIMITED
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