CN106566924B - A kind of leaching mine agent and its preparation method and application - Google Patents
A kind of leaching mine agent and its preparation method and application Download PDFInfo
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- CN106566924B CN106566924B CN201610898734.5A CN201610898734A CN106566924B CN 106566924 B CN106566924 B CN 106566924B CN 201610898734 A CN201610898734 A CN 201610898734A CN 106566924 B CN106566924 B CN 106566924B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
- C22B3/06—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions, e.g. with acids generated in situ; in inorganic salt solutions other than ammonium salt solutions
- C22B3/08—Sulfuric acid, other sulfurated acids or salts thereof
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B59/00—Obtaining rare earth metals
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Abstract
The invention discloses a kind of leaching mine agent and its preparation method and application.The preparation method is that the magnesite of iron content, manganese and calcium is sized mixing with water after crushed, and acid is then added and decomposes to the weakly acidic leaching mine agent to get liquid.The application refers to the application in " ionic " Rare Earth Mine exploitation engineering.The Jin Kuangjishi enterprises of the present invention carry out without ammonia nitriding operation, can veritably realize green production, and can make soil nutrient；Ore-leaching speed is improved simultaneously and leaches mother liquid concentration, reduces liquid measure and subsequent handling treating capacity, and the leaching mine period can shorten 20~40% or more, reduce cost, improve yield 20%；The leaching mineral water of technique is flat compared with prior art, and the present invention comprehensively improves technology, economic indicator, and " full phase " rare earth yield improves 3~6%, and unit direct cost reduces；In addition, also improving the compactness of ore particle structure, the opposite stability for maintaining mountain (mine) body structure reduces the possibility of unstable ore body sliding.
Description
Technical field
The present invention relates to mining technology technical fields, and in particular to a kind of leaching mine agent and its preparation method and application.
Background technology
, how will be with the rare-earth mineral of " ion " state for south " ionic " Rare Earth Mine, " the leaching from ore (body)
Go out " (or " desorption ") out, prior art processes are mainly to be leached to the rare earth in ore body using " leaching mine agent "." leaching " ion
" agent of leaching mine " of type rare earth, initial stage uses sodium chloride, then generally uses ammonium sulfate.
" leaching mine " in the prescribed manner and is required containing inside the body of mine, digging reach inside ore body fluid injection well (or
Hole), leaching mine agent solution (electrolyte solution) is directly injected into ore body by fluid injection well (hole).Chemical property is more living in electrolyte
Bold and vigorous cation, will be adsorbed on the chemical property activity of " carrier mineral " between surface and crystal layer compared with the former worse rare earth sun from
Son, exchange desorb.Then mother liquor will be leached by liquid collection system to collect, make it into following process processing system.
According to leaching mine principle, movement of the electrolyte solution in ore body, being one, " infiltration → diffusion → exchange → is spread again
→ permeate again " process.The entire motion process of electrolyte solution, that is, mistake that rare earth ion is constantly exchanged and desorbed
Journey.Diffusion kinetics are the concentration differences of electrolyte solution, and exchange interaction has occurred for solution (or the top water) extrusion for constantly injecting ore body
Rare earth ore leachate.During this constantly " leaching mine ", the liquid inside ore body is injected, by constantly exchanging, squeezing out, gradually
As " mother liquor " (referred to as " mother liquor ") containing rare earth, or it is referred to as " leaching mother liquor ", and is finally completed " leaching mine ".The rare earth of leaching
" mother liquor ", into follow-up rare earth treatment process, such as removal of impurities, precipitation, calcination, hydrochloric acid decomposition, extraction.
Currently, " in_situ leaching " generally is used with process of enriching for the leaching of " ion type rareearth ore " in the prior art,
The flow diagram of its excavated technology is as shown in Figure 1, leaching mine agent therein generally uses ammonium sulfate at present.However, using sulfuric acid
Ammonium carries out leaching mine as " agent of leaching mine ", is had the following problems in application practice：
(1) because of the medicament of technique application, component contains ammonia nitrogen, therefore during process implementing, in many links,
Ammonia nitrogen severely exceeds, and pollutes environment, constrains the use of technique.Many mines have been suspended operations for consolidation for many years, are not reproduced so far.
(2) leaching mother liquid concentration is low, liquid measure is big, processing cost is higher, cannot be directly into slot extraction and separation.
(3) in entire art production process, rare earth leaching cycle is longer, a complete production process production cycle compared with
Long.
(4) if owner's technology grasps inadequate, work arrangement and mismanagement, mountain (mine) internal portion is reduced during leaching mine
Frictional force (structural capacity), mountain (mine) body structure are easy to " unstable " state occur, to be easy to cause " geological problem ".
(5) ammonium sulfate that the technique uses soaks mine agent, is primarily adapted for use in the leaching of " ion phase " rare earth in " full phase " rare earth,
Research is lacked to the recycling comprising " other phases " rare earth in " four phases, eight state ", causes the leaching mine agent that the technique uses to " its
The utilization rate of its phase " rare earth resources is very poor.
(6) in ammonium sulfate leaching mine agent, the leaching to rare earth ion, " the NH of only " single " that really plays a role4 +" from
Son leaches efficiency, especially poor to the leaching efficiency of " other phases " rare earth.
(7) ammonium sulfate leaching mine agent does not consider to improve soil texture, improves soil nutrient horizontal problem.It is soaked using the leaching mine agent
After mine, it is out of proportion to exacerbate soil nutrient.
(8) ammonium sulfate leaching mine agent is not made an issue of from medicament itself, and the stability of mountain (mine) body is safeguarded by soaking mine.
Invention content
In view of this, the object of the present invention is to provide a kind of novel leaching mine agent and its preparation method and application, to solve
Certainly aforementioned at least one technical problem existing in the prior art.
To achieve the above object, one aspect of the present invention provides a kind of preparation method of leaching mine agent, is by iron content, manganese and calcium
Magnesite sized mixing after crushed with water, then be added acid decomposes to the weakly acidic leaching mine agent to get liquid.
Contain the composite cations such as magnesium, iron, manganese and calcium in leaching mine agent produced by the present invention.
Preferably, the preparation method further includes：It, will be mother liquid obtained by the leaching mine agent of gained liquid after being filtered, washed
It is evaporated crystallization and soaks mine agent to get solid.If soaking mine agent using solid during soaking mine, solid leaching mine agent is first added into water
Or acid redissolves, and further according to needing pH value carrying out appropriate adjusting, the leaching mine agent of liquid is obtained, then again by the leaching of obtained liquid
Mine agent is for soaking mine.
Preferably, iron in the magnesite<10%, manganese<3%, calcium<10%, the percentage is mass percent.
Preferably, described crush is that the grain size of the magnesite is crushed to 0.125~0.15mm.
Preferably, the acid can be that this field is conventional, more preferable sulfuric acid.
Another aspect of the present invention provides one kind and soaking mine agent made from above-mentioned preparation method.
Further aspect of the present invention also provides application of the above-mentioned leaching mine agent in " ionic " Rare Earth Mine exploitation engineering.
In " ionic " Rare Earth Mine exploitation engineering, when in use, concentration is preferably >=3.5% for the leaching mine agent.Herein,
The meaning of a concentration of this field routine refers to the main matter of sulfate in the solution such as magnesium, iron, calcium, manganese in leaching mine agent
Measure percentage composition.
Compared with prior art, the present invention achieves following advantageous effects：
(1) Jin Kuangjishi enterprises of the invention carry out without ammonia nitriding operation, can veritably realize green production, and can make soil
Earth nutrient laden；
(2) leaching mine agent of the invention improves ore-leaching speed and leaches mother liquid concentration, reduces at liquid measure and subsequent handling
Reason amount, leaching mine period can shorten 20~40% or more, reduce cost, improve yield 20%；
(3) present invention has groped approaches and methods to " other phases " rare earth Utilizing question, and leaching mine agent of the invention is to " its
Its phase " rare earth resources are using average up to 15~30% or more；
(4) the leaching mineral water of technique is flat compared with prior art, and the present invention comprehensively develops skill, economic indicator, and " full phase " is dilute
The native rate of recovery improves 3~6%, and unit direct cost reduces；
(5) leaching mine agent of the invention improves the compactness of ore particle structure, opposite to maintain mountain (mine) body structural stability,
Reduce the possibility of unstable ore body sliding.
Description of the drawings
Fig. 1 is the flow of " in_situ leaching " its excavated technology generally used for " ion type rareearth ore " in the prior art
Schematic diagram.
Fig. 2 is the process flow diagram of " ionic " Rare Earth Mine exploitation engineering of the leaching mine agent application of the present invention.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in further detail.
Present inventor be directed to outstanding problem existing in the prior art, from it is following it is several in terms of pointedly carry out
Technological innovation：
(1) it researches and develops and using environment-friendly type, the Novel immersion mine agent without ammonia nitrogen, ammonia and nitrogen pollution is solved the problems, such as from source, more
Effectively to leach rare earth, to realize lasting exploit to " ion type rareearth "；
(2) it soaks in mine agent and introduces and apply " contracting agent " medicament and technology, improve ore body configuration state, reduce mountain
The incidence that body caves in, comes down improves soil constitution, and it is horizontal to improve soil nutrientization；
(3) ore-leaching speed is improved, the leaching mine period is shortened；Mother liquid concentration is improved, mother liquor quantum of output is reduced and subsequent handling adds
Work amount；
(4) explore with research to " other phases " rare earth resources leach with recycle medicament, technical measures, method, condition,
Parameter improves resource utilization；
(5) present invention very focuses on the factors such as composite cation, ferrous ion, sulfite ion, " contracting agent " in " leaching
Comprehensive function in mine agent ".
Above-mentioned technological innovation, it is intended to realize leaching mine without ammonia nitriding operation, lasting exploit, environment protection standard, prevent rock-mass slippage,
" other phases " resource utilization is improved, ore-leaching speed is improved, shortens the leaching mine period；Mother liquid concentration is improved, mother liquor output is reduced
Amount.To realize the major transformation of ion type rareearth extraction process, technical-economic index fully optimized, eco-friendly
Purpose.
Leaching principle based on ion adsorption type rare earth ore, while considering the ready availability and economy of raw materials for production,
In the research and development of Novel immersion mine agent, on the basis of a large amount of R＆D work early period, it is determined that the present invention " agent of leaching mine " research and development are basic
Technological thought：First, synergistic effect rare earth ion leached using composite cation, come the leaching for replacing the prior art to use
Single NH in mine agent ammonium sulfate4 +Ion；Secondly, to be conducive to the leaching of rare earth, in the leaching mine agent of research and development, also retain certain
Ferrous ion, sulfite ion component；Third, " contracting agent " medicament and technology are conducive to safeguard that mountain (mine) body is stablized, add
Fast ore-leaching speed shortens the leaching mine period, therefore also contains the substance group with " contracting agent " effect in " agent of leaching mine " of the present invention
Point.It above-mentioned 3 points, becomes and screens making raw material for us, research and develop the important evidence and basic principle of Novel immersion mine agent.Through excessive
The inquiry experiment of amount is groped and through experimental verification repeatedly, has obtained technical scheme of the present invention finally, and dilute at " ionic "
Good application is obtained in native mine exploitation engineering.
As shown in Fig. 2, it shows for the technological process of " ionic " Rare Earth Mine exploitation engineering of the leaching mine agent application of the present invention
It is intended to, includes mainly rare earth Situ Leaching and process of enriching, specifically include：
Step 1：Injection leaching mine agent and contracting agent inside to ore body, In-situ leaching mine keep " ion phase " and part " other
Phase " rare earth leaches, and obtains leaching mother liquor；
Step 2：It is passed through cleaner I into the middle and high concentration of concentration >=1g/L leaching mother liquor to clean, be passed through after removal of impurities
Precipitating reagent precipitates, then obtains solid-state rare-earth products through clear water washing, filtering, calcination；Wherein, the cleaner I is sodium bicarbonate
The mixed liquor of solution and carbon acid solution, the precipitating reagent are sodium bicarbonate solution；With
To concentration<It is passed through cleaner II neutralizations in the leaching at low-concentration mother liquor of 1g/L and removes removing aluminum impurity, after then removing aluminium
Mother liquor (leaching mother liquor through except gained rare earth supernatant after aluminium) is passed through the adsorption and enrichment that rare earth ion is carried out in ion exchange column,
It is desorbed again with acid, obtains liquid rare-earth products；Wherein, the cleaner II is milk of lime.
Further include following preparation in general before formally starting to soak mine exploitation work：
1, geologic prospect is supplemented；
2, engineering design and construction；
3, major project is built：
(1) fluid injection system；
(2) water supplying system；
(3) liquid system is received on underground, ground；
(4) hydrometallurgy system；
(5) power supply and distribution system；
(6) other assistant systems；
(7) ionic adsorption removal of impurities, enrichment system and storage tank (vehicle).
In this field, the preservation character of " ionic " Rare Earth Mine rare earth is made of " four phases, eight state " rare-earth mineral：1. from
Son absorption phase (ADSORPTION STATE containing interchangeability, obligate ADSORPTION STATE；2. dispersion (ADSORPTION STATE containing colloid, gel state)；3. independent
Mineral facies (state containing hypergenic minerals, residual ore body states of matter)；4. lattice impurity phase (state containing isomorph, interior same crystalline state of diving).By this " four
The rare-earth mineral of eight state of phase " is constituted in ion adsorption type rare earth ore, so-called " full phase " rare-earth mineral.About " four phases eight
The source of its name data of state " is：《South jiangxi granite weathering crust ion adsorption type re research on mineralization》Report, south jiangxi
Geologic survey group, 1986.
Wherein, described " other phases " rare earth refers in ion type rareearth ore, in addition to " ion phase " rare-earth mineral,
The rare-earth mineral of remaining " phase ".
It is specific embodiment below, the realization and its technology for understanding the present invention in detail by specific embodiment are imitated
Fruit.Wherein, REO refers to rare earth oxide (rare earth oxide), and RE refers to rare earth (rare earth).
1 liquid of embodiment soaks the preparation of mine agent
It is 0.125~0.15mm that magnesite ore, which is crushed to grain size, after sized mixing with water, sulfuric acid decomposition is then added to being in
Faintly acid soaks mine agent to get liquid.Wherein, iron in the magnesite<10%, manganese<3%, calcium<10%, the percentage is matter
Measure percentage.Containing composite cations such as magnesium, iron, manganese and calcium in obtained liquid leaching mine agent.
2 solid of embodiment soaks the preparation of mine agent
Liquid made from embodiment 1 is soaked into mine agent after being filtered, washed, crystallization is evaporated to get solid by mother liquid obtained
Body soaks mine agent.Solid soaks mine agent convenient for storage and transport.
During soaking mine, solid can be soaked to mine agent, water or acid is added to redissolve, obtain the leaching mine agent of liquid, then adjust pH
It is reused after value to appropriate range.
Application examples 1
Ion type rareearth ore in the application example comes from Ganzhou Xunwu Rare-earth Mine, sample ore main chemical compositions such as table
Shown in 1.
1 Xunwu ion type rareearth ore main component table of table
First, the preparation of early period is carried out：
1, geologic prospect is supplemented；
2, engineering design and construction；
3, major project is built：
(1) fluid injection system；
(2) water supplying system；
(3) liquid system is received on underground, ground；
(4) power supply and distribution system；
(5) other assistant systems.
Then, start to soak mine enrichment work：
Injection leaching mine agent and contracting agent inside to ore body, In-situ leaching mine keep " ion phase " and part " other phases " dilute
Soil leaches, and obtains leaching mother liquor.
Specifically, in first, the mid-term injection leaching mine agent of leaching mine；It crosses peak value when leaching the content of rare earth in mother liquor and declines
When to 60%, stop leaching mine agent injection, is changed to injection top water and (contains contracting agent in the water of top, i.e. contracting agent is added in the water of top, with top
Water injects together), when leaching the content of rare earth in mother liquor and dropping to 0.1 grams per liter, stops injection top water and simultaneously receive liquid, terminate leaching
Mine.Contracting agent therein is calcium chloride solution.
Application examples 2
Weigh rare earth sample ore (as shown in table 1) 18kg and be put into and leach in column, with the leaching mine agent of embodiment 1 to rare earth sample ore into
Row leaches.The experimental condition of leaching is raw ore weight 18kg, leaches agent concentration 4wt%, leaching agent flow velocity 3ml/min, liquid-solid ratio
(volume ratio for soaking mine agent and rare earth sample ore) 1:3.25.At the conditions of the experiments described above, ion phase rare earth leaching rate is
99.45%, " other phases " rare earth leaching rate is 30.02%, leaches Fe, Al, Si impurity phase in mother liquor and answers the leaching rate to be respectively
0.73%, 0.37%, 1.93%.
Application examples 3
Weigh rare earth sample ore (as shown in table 1) 18kg and be put into and leach in column, with the leaching mine agent of embodiment 1 to rare earth sample ore into
Row leaches.The experimental condition of leaching is raw ore weight 18kg, leaches agent concentration 2.5wt%, leaching agent flow velocity 3ml/min, liquid is solid
Than 1:2.5.At the conditions of the experiments described above, ion phase rare earth leaching rate is 91.04%, and " other phases " rare earth leaching rate is
12.5%, leach in mother liquor that answer leaching rate be respectively 0.68%, 0.32%, 1.86% to Fe, Al, Si impurity phase.
Application examples 4
Weigh rare earth sample ore (as shown in table 1) 18kg and be put into and leach in column, with the leaching mine agent of embodiment 1 to rare earth sample ore into
Row leaches.The experimental condition of leaching is raw ore weight 18kg, leaches agent concentration 3.5wt%, leaching agent flow velocity 2.5ml/min, liquid
Admittedly than 1:3.5.At the conditions of the experiments described above, ion phase rare earth leaching rate is 99.17%, and " other phases " rare earth leaching rate is
22.51%, leach in mother liquor that answer leaching rate be respectively 0.85%, 0.41%, 1.89% to Fe, Al, Si impurity phase.
Application examples 5
Weigh rare earth sample ore (as shown in table 1) 18kg and be put into and leach in column, with the leaching mine agent of embodiment 1 to rare earth sample ore into
Row leaches.The experimental condition of leaching is raw ore weight 18kg, leaches agent concentration 4.5wt%, leaching agent flow velocity 2.5ml/min, liquid
Admittedly than 1:4.5.At the conditions of the experiments described above, ion phase rare earth leaching rate is 99.81%, and " other phases " rare earth leaching rate is
27.51%, leach in mother liquor that answer leaching rate be respectively 0.91%, 0.47%, 2.04% to Fe, Al, Si impurity phase.
The various embodiments described above and application examples, in conjunction with some measured datas of the present invention in implementation process, the results show that phase
Than the prior art, the present invention has following advantages：
(1) outstanding feature of leaching mine agent very advantageous of the invention is：In its component containing composite cation, ferrous ion,
Sulfite ion, and contain " contracting agent " component substances；There is very excellent leaching efficiency to " ion phase " rare earth；To " other
Phase " rare earth has the leaching effect of " suitable "；" should soak mine agent " helps to safeguard that mountain (mine) body is stablized, for green, environment-friendly type medicine
Agent.
(2) raw materials for production that leaching mine agent of the invention uses enrich cheap, simple production process, and crystallizable product is solid
Body is readily transported, stores.
(3) leaching mine agent of the invention has excellent leaching mine performance, to the leaching behavior of " other phases " rare earth show compared with
It is good；The leaching of " ion phase " rare earth reaches 99.4% or more, and the leaching rate of part " other phases " rare earth reaches 22.5% or more,
" full phase " rare earth leaching rate reaches 83% or more.Compared with the ammonium sulfate leaching mine agent that prior art processes use, to " other phases
The rare earth leaching effect of state " is especially prominent, and " other phases " rare earth leaching rate improves 15%, and " full phase " rare earth leaching rate improves
3%.In the case of same dosing, leaching mine agent of the invention can shorten 20~40% or more the mine period of leaching.
(4) using the leaching mine agent of the present invention, in obtained leaching mother liquor, main non-rare earth impurity Fe, Al, Si leaching rate
Respectively 0.73%, 0.37%, 1.93%, respectively account for the prior art ammonium sulfate leaching mine agent leach rare earth mother solution in 8.81%,
77.08%, 51.60%.The leaching mine agent of the present invention substantially reduces the leaching of iron, and the leaching of aluminium, silicon also has drop not by a small margin
It is low.Good, the lower leaching mother liquor of impurity content, will greatly facilitate the working process of subsequent wet metallurgy.
(5) leaching mine agent of the invention in the production process, has contemplated that and fit applications " contracting agent " technology and its component.Its
In include " contracting agent " ingredient, main matter be calcium.The important function that it is played is to reinforce ore particle structure, is improved mountain (mine)
The stability of body structure makes it be not easy to slide along structural plane.Meanwhile being conducive to improve leaching velocity, shorten the leaching mine period.
(6) leaching mine agent of the invention so that in subsequent technological process, precipitate supernatant and other be related to outer row's
Liquid, every environmental protection index, especially ammonia nitrogen≤8mg/L, COD (COD)≤100mg/L, P≤1mg/l, all meets
The related request of environmental protection.Mine is soaked using the leaching mine agent of the present invention, can pollute asking for environment to avoid ammonia nitrogen and other factors completely
Topic, the ammonium sulfate for substituting the prior art have great advantage.
(7) leaching mine agent of the invention makes " other phases " rare earth partly be leached, and average leaching rate 15~30% is
The utilization of " other phases " rare earth resources, has groped method and approach.
(8) the leaching mine agent of the application present invention, experiment, which obtains, leaches mother liquor 5.6~6.4g/L of mean concentration, and the prior art
Technique only 4.4~4.6g/L improves 21.7~45.5% than prior art processes.Based on leachate mean concentration, the present invention obtains
Mother liquor 3.7~4.2L of amount, and prior art processes be 4.99~5.0L, than prior art processes reduce liquid measure 16~
26%.Therefore, leaching mine is carried out using the leachate of the present invention, leaches mother liquid concentration and improves, liquid measure is reduced, and both shortens leaching mine week
Phase, and subsequent handling treating capacity is reduced, overall cost reduces.
It is mainly asked existing for the leaching mine agent ammonium sulfate that prior art processes use in conclusion the present invention effectively overcomes
Topic：First, environmental protection is whole up to standard, enterprise can veritably realize green production, and can make soil nutrient；Second is that improving leaching mine
Speed and leaching mother liquid concentration, reduce liquid measure and subsequent handling treating capacity, and the leaching mine period can shorten 20~40% or more, reduce
Cost improves yield 20%；Third, having groped approaches and methods, leaching mine agent of the invention to " other phases " rare earth Utilizing question
To " other phases " rare earth resources using average up to 15~30% or more；Fourth, it is more flat than the leaching mineral water of prior art processes, entirely
It develops skill to face, economic indicator, " full phase " rare earth yield improves 3~6%, and unit direct cost reduces；Fifth, improving
The compactness of ore particle structure, it is opposite to maintain mountain (mine) body structural stability, reduce the possibility of unstable ore body sliding.Thus
As it can be seen that prior art processes are obtained for well in the present invention using some outstanding problems existing for ammonium sulfate leaching mine agent
It solves.The present invention is the production of existing ion type rareearth mine, provides a kind of completely new, effective, advanced, every technology
The excellent leaching mine medicament of economic indicator.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical solution and advantageous effect
Describe in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the protection of the present invention
Within the scope of.
Claims (7)
1. a kind of preparation method of leaching mine agent, which is characterized in that it is by the magnesite of iron content, manganese and calcium after crushed with water tune
Then slurry is added acid and decomposes to the weakly acidic leaching mine agent to get liquid；Iron in the magnesite<10%, manganese<3%, calcium<
10%, the percentage is mass percent.
2. preparation method according to claim 1, which is characterized in that the preparation method further includes：By gained liquid
Mine agent is soaked after being filtered, washed, and crystallization is evaporated to get solid leaching mine agent by mother liquid obtained.
3. preparation method according to claim 1, which is characterized in that the crushing is to crush the grain size of the magnesite
To 0.125~0.15mm.
4. preparation method according to claim 1, which is characterized in that the acid is sulfuric acid.
5. one kind soaking mine agent made from Claims 1 to 4 any one of them preparation method.
6. application of the leaching mine agent in " ionic " Rare Earth Mine exploitation engineering described in claim 5.
7. application according to claim 6, which is characterized in that in " ionic " Rare Earth Mine exploitation engineering, the leaching mine
Use concentration >=3.5% of agent.
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