CN102260791A - Heap leaching method for red soil nickel ore - Google Patents

Heap leaching method for red soil nickel ore Download PDF

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Publication number
CN102260791A
CN102260791A CN2011102157901A CN201110215790A CN102260791A CN 102260791 A CN102260791 A CN 102260791A CN 2011102157901 A CN2011102157901 A CN 2011102157901A CN 201110215790 A CN201110215790 A CN 201110215790A CN 102260791 A CN102260791 A CN 102260791A
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China
Prior art keywords
ore
dump leaching
red soil
leaching
leaching method
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CN2011102157901A
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Chinese (zh)
Inventor
肖万林
王多冬
张彦生
王亚秦
陈彦林
丘能
陈高明
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GUANGXI YINYI SCIENCE AND TECHNOLOGY MINE METALLURGY Co Ltd
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GUANGXI YINYI SCIENCE AND TECHNOLOGY MINE METALLURGY Co Ltd
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Priority to CN2011102157901A priority Critical patent/CN102260791A/en
Publication of CN102260791A publication Critical patent/CN102260791A/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention discloses a heap leaching method for red soil nickel ore. In the method, sulfates of one or all of potassium, sodium and ammonium are added into sulfuric acid solution for ore leaching, and in leachate, iron and monovalent cations of potassium, sodium and ammonium form a metavoltaite solid and thus is removed. By the method, the leaching of iron impurities in the heap leaching process can be inhibited effectively, so that the burden of the subsequent processing of heap leaching liquid is relieved, the operating cost is reduced, and the recovery rate of nickel is improved.

Description

A kind of red soil nickel ore dump leaching method
Technical field
The present invention relates to a kind of dump leaching method of ore, the dump leaching method of a kind of red soil nickel ore of saying so more specifically.
Background technology
Dump leaching is the hydrometallurgical extraction technology that a kind of mode with lower operational cost leaches valuable metal in the mineral, is to place and leach the pond through broken ore with soaking ore deposit agent maceration, makes valuable component wherein change the process of solution over to.
The technological process of dump leaching is that the ore with fragmentation places and adorns in the with a false bottom pond, is coated with filtration medium at false the end, and pipeline for leach liquor circulation usefulness, valve etc. are housed at the bottom of the pond.Be usually used in the high slightly granular ore of grade and leach, make soak the ore deposit agent from top to bottom diafiltration by the ore particle layer.The intact back of maceration is with the clear water washing, and wash water is used to prepare new leaching agent, and leached mud can be used artificial or Excavating bucket discharging.Leach simultaneously in general a plurality of macerations pond of adopting, with stablizing of useful component content in the maintenance immersion liquid.
For low-grade red soil nickel ore, generally adopt at present the dump leaching method to extract nickel in the ore, be 200510010915.1 Chinese patents etc. as application number.The conventional way that liquid is executed in dump leaching is that some heaps are taked fixedly to execute the liquid mode, being about to ore leachate drenches above ore down, pass through ore layer from top to bottom, leach liquor is collected from the bottom, pond, with being pumped to above the ore of Chi Ding, form self-circulation, again for certain dump leaching pond, only circulation in this heap of ore leachate is till the most nickel in the ore of dump leaching pond is leached.The content of nickel is very low in the red soil nickel ore, generally has only 1～2%, adopts the concentration of metal target nickel in the leach liquor that this dump leaching mode obtained often very low, and foreign matter content is higher.
During leaching, it is higher to soak the ore deposit agent concentration, and a large amount of impurity is leached, especially the iron in the ore, a large amount of leachings of iron cause trouble for follow-up processing, need expend a large amount of neutralizing agents and remove assorted and frequent solid-liquid separation operation, also are unfavorable for the raising of nickel metal recovery rate simultaneously.
Summary of the invention
The present invention is exactly at the deficiencies in the prior art, provide a kind of red soil nickel ore improved dump leaching method, its objective is by the iron of leaching is precipitated with siderotil solid form toward soaking the salt that adds potassium, sodium, ammonium in the agent of ore deposit, suppressed the leaching of iron contamination in the heap leaching process effectively, thereby reduced the burden of heap leaching solution subsequent disposal, reduce running cost, improve the rate of recovery of nickel.
Above-mentioned purpose realizes by following proposal:
A kind of red soil nickel ore dump leaching method is characterized in that, said method comprising the steps of:
A) the red soil nickel ore ore is carried out fragmentation, washup, classification;
B) above-mentioned ore is packed in the dump leaching pond, make up one or more ore storages;
C) with the described ore storage of inorganic acid solution lixiviate, wherein said inorganic acid solution contains one or more monovalent cations in potassium, sodium, the ammonium;
D) from the leach liquor of dump leaching processing gained, reclaim the nickel cobalt.
Dump leaching method according to above-mentioned is characterized in that, earlier ore is carried out fragmentation in step a), washup is handled, thin mud in the flush away ore or clay composition, and the classification ore of selecting 1～10mm particle diameter is used as dump leaching again.
Dump leaching method according to above-mentioned is characterized in that, described mineral acid is a sulfuric acid, and its mass percent concentration is 1～10%.
Dump leaching method according to above-mentioned is characterized in that, in described sulphuric acid soln, the ratio of total molar mass of sulfate radical is 0.05～0.5:1 in total molar mass of potassium, sodium, ammonium ion and the sulphuric acid soln.
Beneficial effect of the present invention: the present invention adopts by toward soaking the salt that adds potassium, sodium, ammonium in the agent of ore deposit the iron of leaching is precipitated with siderotil solid form, suppressed the leaching of iron contamination in the heap leaching process effectively, thereby reduced the burden of heap leaching solution subsequent disposal, reduce running cost, improve the rate of recovery of nickel.
Embodiment
Red soil nickel ore dump leaching method disclosed by the invention may further comprise the steps:
A) the red soil nickel ore ore is carried out fragmentation, washup, classification;
B) above-mentioned ore is packed in the dump leaching pond, make up one or more ore storages;
C) with the described ore storage of inorganic acid solution lixiviate, wherein said inorganic acid solution contains one or more monovalent cations in potassium, sodium, the ammonium;
D) from the leach liquor of dump leaching processing gained, reclaim the nickel cobalt.
The principle of this method is as follows:
The dump leaching of red soil nickel ore many with sulfuric acid as soaking the ore deposit agent, lixiviate metal target nickel cobalt from ore leaches to react and is: NiO+H 2SO 4=NiSO 4+ H 2O
And CoO+H 2SO 4=CoSO 4+ H 2O
The nickel cobalt enters leach liquor with the form of soluble sulphate, but leaching process always has some side reactions:
Fe 2O 3?+?3H 2SO 4?=?Fe 2(SO 4) 3?+?3H 2O
FeO?+?H 2SO 4?=?FeSO 4?+?H 2O
And MgO+H 2SO 4=MgSO 4+ H 2O
Except metal target nickel cobalt, do not wish the impurity F e and the Mg that exist in the leach liquor in addition, need follow-up treatment process separate these impurity.
Iron in the known solution can form the siderotil solid precipitation under suitable condition, and its chemical principle is:
A 2SO 4?+?3Fe 2(SO 4) 3?+12H 2O?=?2A?Fe 3(SO 4) 2(OH) 6?+6?H 2SO 4
A is the monovalent cation of solubility in the formula, as K +, Na +, NH 4 +Deng, the A Fe of generation 3(SO 4) 2(OH) 6Solid is called ihleite, as K Fe 3(SO 4) 2(OH) 6, Na Fe 3(SO 4) 2(OH) 6, NH 4Fe 3(SO 4) 2(OH) 6Be called jarosite, yellow modumite, ammonium jarosite.This kind method for removing iron has been proven technique and obtained the application of wide model in the hydrometallurgy.
From above-mentioned reaction formula as can be known, the molysite of solubility can be emitted sulfuric acid in the process that forms ihleite, the continuation that hinders ihleite forms, need alkaline matter this partly sulfuric acid that neutralizes, magnesium oxide then can serve as this role just in the red soil nickel ore, and therefore only needing increases a spot of monovalence K toward soaking in the ore deposit agent sulphuric acid soln +, Na +, NH 4 +Just the iron that leaches can be changed into solid again removes.
Based on the above-mentioned fact, the present invention is applied to the heap leaching process of red soil nickel ore with this principle, suppresses the leaching of iron in ore with this, thereby reaches the purpose that reduces iron level in the leach liquor.
Embodiment 1
A kind of transition type red soil nickel ore, through washup, fragmentation, stage treatment, remove fine grain and argillaceous composition in the ore deposit, keeping particle diameter is the ore part of 1～10mm, contain in the assay ore: Ni 1.65%, Co 0.06%Fe 12%, and Mg 18%, ore is packed in the dump leaching pond, and preparing mass percent concentration is 5%H 2SO 4The Na that wherein contains 12g/L 2SO 4Solution execute liquid from top, dump leaching pond to ore layer with the spray or the mode of drip irrigation, collect the effusive leach liquor circulation in bottom, dump leaching pond and be added to ore layer, lixiviate nickel cobalt wherein, after 60 days, chemically examine through sampling analysis, Ni content in the ore has dropped to 0.36%, contains Ni 3.5g/L in the leach liquor, Co 0.045g/L and Fe content only is 2.89g/L.
Embodiment 2
The treatment process of ore and composition are with embodiment 1, and operation steps is also identical, and ore leachate is mass percent concentration 10% H 2SO 4Sulphuric acid soln, wherein contain the K of 33g/L 2SO 4Solution is executed liquid from top, dump leaching pond to ore layer in the mode of spray or drip irrigation, collect the effusive leach liquor circulation in bottom, dump leaching pond and be added to ore layer, lixiviate nickel cobalt wherein, after 48 days, through the sampling analysis chemical examination, the Ni content in the ore has dropped to 0.28%, contain Ni 3.8g/L in the leach liquor, Co 0.05g/L and Fe content only is 5.1g/L.
Embodiment 3
The treatment process of ore and composition are with embodiment 1, and operation steps is also identical, and ore leachate is mass percent concentration 1% H 2SO 4Sulphuric acid soln, wherein contain (the NH of 0.5g/L 4) 2SO 4Solution is executed liquid from top, dump leaching pond to ore layer in the mode of spray or drip irrigation, collect the effusive leach liquor circulation in bottom, dump leaching pond and be added to ore layer, lixiviate nickel cobalt wherein, after 90 days, through the sampling analysis chemical examination, the Ni content in the ore has dropped to 0.45%, contain Ni 2.6g/L in the leach liquor, Co 0.03g/L and Fe content only is 1.5g/L.
Embodiment 4
The treatment process of ore and composition are with embodiment 1, and operation steps is also identical, and ore leachate is mass percent concentration 3% H 2SO 4Sulphuric acid soln, wherein contain the Na of 6g/L 2SO 4(NH with 5g/L 4) 2SO 4Solution is executed liquid from top, dump leaching pond to ore layer in the mode of spray or drip irrigation, collect the effusive leach liquor circulation in bottom, dump leaching pond and be added to ore layer, lixiviate nickel cobalt wherein, after 60 days, through the sampling analysis chemical examination, the Ni content in the ore has dropped to 0.36%, contain Ni 3.2g/L in the leach liquor, Co 0.05g/L and Fe content only is 2.5g/L.
From the above embodiments as seen, the inventive method is having unusual effect aspect the leaching that reduces iron.

Claims (4)

1. a red soil nickel ore dump leaching method is characterized in that, said method comprising the steps of:
A) the red soil nickel ore ore is carried out fragmentation, washup, classification;
B) above-mentioned ore is packed in the dump leaching pond, make up one or more ore storages;
C) with the described ore storage of inorganic acid solution lixiviate, wherein said inorganic acid solution contains one or more monovalent cations in potassium, sodium, the ammonium;
D) from the leach liquor of dump leaching processing gained, reclaim the nickel cobalt.
2. dump leaching method according to claim 1 is characterized in that, earlier ore is carried out fragmentation in step a), washup is handled, thin mud in the flush away ore or clay composition, and the classification ore of selecting 1～10mm particle diameter is used as dump leaching again.
3. dump leaching method according to claim 1 is characterized in that, described mineral acid is a sulfuric acid, and its mass percent concentration is 1～10%.
4. dump leaching method according to claim 3 is characterized in that, in described sulphuric acid soln, the ratio of total molar mass of sulfate radical is 0.05～0.5:1 in total molar mass of potassium, sodium, ammonium ion and the sulphuric acid soln.
CN2011102157901A 2011-07-29 2011-07-29 Heap leaching method for red soil nickel ore Pending CN102260791A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102660687A (en) * 2012-05-09 2012-09-12 南京大学 Method for recycling heavy metal resources of stainless steel pickling waste water neutralization sludge
CN102912144A (en) * 2012-09-12 2013-02-06 北京矿冶研究总院 Method for leaching vanadium pentoxide from vanadium-containing soot
CN102912123A (en) * 2012-09-12 2013-02-06 北京矿冶研究总院 Method for decomposing stone coal vanadium ore by curing sulfuric acid
CN102943174A (en) * 2012-11-21 2013-02-27 广西藤县雅照钛白有限公司 Method for preparing nickel sulfide concentrate through titanium dioxide waste acids
CN102994746A (en) * 2012-11-21 2013-03-27 广西藤县雅照钛白有限公司 Method for producing nickel sulfide ore concentrate by use of industrial waste acid
CN107099679A (en) * 2017-03-10 2017-08-29 中国恩菲工程技术有限公司 Suppress the method that aluminium is leached in lateritic nickel ore high pressure extract technology

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101736167A (en) * 2008-11-05 2010-06-16 玉林伟镍科技矿冶有限公司 Method for leaching nickel-containing eluvial ore
CN101768665A (en) * 2008-12-30 2010-07-07 厦门紫金矿冶技术有限公司 Method for reducing acid consumption during heap leaching and high-pressure leaching of nickel laterite ore

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101736167A (en) * 2008-11-05 2010-06-16 玉林伟镍科技矿冶有限公司 Method for leaching nickel-containing eluvial ore
CN101768665A (en) * 2008-12-30 2010-07-07 厦门紫金矿冶技术有限公司 Method for reducing acid consumption during heap leaching and high-pressure leaching of nickel laterite ore

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102660687A (en) * 2012-05-09 2012-09-12 南京大学 Method for recycling heavy metal resources of stainless steel pickling waste water neutralization sludge
CN102912144A (en) * 2012-09-12 2013-02-06 北京矿冶研究总院 Method for leaching vanadium pentoxide from vanadium-containing soot
CN102912123A (en) * 2012-09-12 2013-02-06 北京矿冶研究总院 Method for decomposing stone coal vanadium ore by curing sulfuric acid
CN102943174A (en) * 2012-11-21 2013-02-27 广西藤县雅照钛白有限公司 Method for preparing nickel sulfide concentrate through titanium dioxide waste acids
CN102994746A (en) * 2012-11-21 2013-03-27 广西藤县雅照钛白有限公司 Method for producing nickel sulfide ore concentrate by use of industrial waste acid
CN102994746B (en) * 2012-11-21 2015-04-08 广西藤县雅照钛白有限公司 Method for producing nickel sulfide ore concentrate by use of industrial waste acid
CN107099679A (en) * 2017-03-10 2017-08-29 中国恩菲工程技术有限公司 Suppress the method that aluminium is leached in lateritic nickel ore high pressure extract technology
CN107099679B (en) * 2017-03-10 2019-12-06 中国恩菲工程技术有限公司 Method for inhibiting aluminum leaching in laterite-nickel ore high-pressure leaching process

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Application publication date: 20111130