CN102864319A - Method for leaching rare earth elements from nickel oxide ore - Google Patents
Method for leaching rare earth elements from nickel oxide ore Download PDFInfo
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Abstract
The invention provides a method for leaching rare earth elements from nickel oxide ore. The method includes mixing nickel oxide ore with concentrated sulfuric acid to obtain a first mixture, curing the first mixture to obtain cured nickel oxide ore, roasting the cured nickel oxide ore to obtain roasted nickel oxide ore and performing water-leaching on the roasted nickel oxide to obtain a leaching solution or leaching slag containing rare earth elements. The method can effectively leach rare earth elements from nickel oxide ore.
Description
Technical field
The present invention relates to leach from nickel oxide ore the method for rare earth element.
Background technology
There is no at present the effective ways that from nickel oxide ore, obtain rare earth element.
Summary of the invention
The present invention is intended to solve at least one of technical problem that exists in the prior art.For this reason, one object of the present invention is to propose a kind of method that can effectively leach rare earth element from nickel oxide ore that has.
The method from nickel oxide ore leaching rare earth element according to the embodiment of the invention comprises the following steps: described nickel oxide ore is mixed with the vitriol oil, in order to obtain the first mixture; Described the first mixture is carried out slaking, in order to obtain the nickel oxide ore through overcuring; Described nickel oxide ore through overcuring is carried out roasting, in order to obtain the nickel oxide ore through roasting; And described nickel oxide ore through roasting is carried out water logging process, in order to obtain to contain leach liquor and the leached mud of rare earth element.Utilization can be leached rare earth element effectively according to the method from nickel oxide ore leaching rare earth element of the embodiment of the invention from nickel oxide ore, thereby can the recovering rare earth element.
Additional aspect of the present invention and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment in conjunction with following accompanying drawing, wherein:
Fig. 1 is the schematic flow sheet that leaches according to an embodiment of the invention the method for rare earth element from nickel oxide ore.
Embodiment
The below describes embodiments of the invention in detail, and the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, only be used for explaining the present invention, and can not be interpreted as limitation of the present invention.
According to an aspect of the present invention, the present invention proposes a kind of method that leaches rare earth element from nickel oxide ore.According to embodiments of the invention, with reference to figure 1, the method comprises the following steps:
At first, described nickel oxide ore is mixed with the vitriol oil, in order to obtain the first mixture, i.e. solidliquid mixture, and described the first mixture carried out slaking, in order to obtain the nickel oxide ore through overcuring.According to some embodiments of the present invention, the type that can be used for nickel oxide ore of the present invention is not particularly limited, as long as it contains rare earth element.According to embodiments of the invention, the nickel oxide ore that can adopt mainly comprises rare earth (RE), nickel (Ni) and other element of low levels such as the oxide compound of aluminium (Al) and iron (Fe) etc., according to concrete example, nickel oxide ore is for containing the rare earth red soil nickel ore, and this contains the rare earth red soil nickel ore and mainly comprises pact (0.001-0.9) %RE of trace, approximately (0.1-4.0) %Ni, about for example Co, Si, Mg, Ca, Cr, Mn of (0.2-20) %Al peace treaty (10-60) %Fe and other element.The contriver is surprised to find, and method of the present invention is particularly suitable for the above-mentioned water logging that contains the rare earth red soil nickel ore and obtains rare earth element.According to some embodiments of the present invention, can adopt the type of the rare earth element of method recovery of the present invention to be not particularly limited.According to one embodiment of present invention, described rare earth element refers at least a of lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu) and scandium (Sc) and yttrium (Y) for being selected from.Thus, can effectively from nickel oxide ore, reclaim these rare earth elements.According to one embodiment of present invention, the total content of described rare earth element is the 0.001-0.9 % by weight.Thus, can further effectively from nickel oxide ore, leach rare earth element.According to one embodiment of present invention, the part by weight of described nickel oxide ore and the described vitriol oil is 1:0.3～0.9.Thus, the efficient of slaking can be improved, thereby the efficient that from nickel oxide ore, leaches rare earth element can be further improved.According to one embodiment of present invention, the part by weight of described nickel oxide ore and the described vitriol oil is 1:0.4～0.6.Thus, can further improve and utilize the vitriol oil to carry out the efficient of maturation process, thereby can further improve the efficient that from nickel oxide ore, leaches rare earth element.According to one embodiment of present invention, under 40～180 degrees centigrade, carry out described slaking 1～8 hour.Thus, can further improve and utilize the vitriol oil to carry out the efficient of maturation process, thereby can further improve the efficient that from nickel oxide ore, leaches rare earth element.According to one embodiment of present invention, described slaking is carried out under 60～150 degrees centigrade.Thus, can further improve and utilize the vitriol oil to carry out the efficient of maturation process, thereby can further improve the efficient that from nickel oxide ore, leaches rare earth element.According to embodiments of the invention, keep the method that contains the curing temperature behind the rare-earth oxidation nickel minerals mixing sulfuric acid and be not particularly limited, can mix the heat that discharges in the sulfuric acid process and come holding temperature by utilizing; Perhaps the first mixture is placed in the container of insulation, takes the mode of external heat to keep curing temperature, wherein type of heating can or utilize the high-temperature flue gas of roasting generation to heat for Electric heating.
Next, described nickel oxide ore through overcuring is carried out roasting, in order to obtain the nickel oxide ore through roasting.According to embodiments of the invention, can carry out the condition of calcination process and be not particularly limited, as long as rare earth element can be converted into can water logging compound oxide compound for example.According to one embodiment of present invention, under 180～750 degrees centigrade, carry out described roasting 1～8 hour.Thus, the efficient of roasting can be improved, thereby the efficient that from nickel oxide ore, leaches rare earth element can be further improved.According to one embodiment of present invention, under 200～700 degrees centigrade, carry out described roasting 1～4 hour.Thus, the efficient of roasting can be further improved, thereby the efficient that from nickel oxide ore, leaches rare earth element can be further improved.According to one embodiment of present invention, before described nickel oxide ore through roasting is carried out the water logging processing, described nickel oxide ore through roasting is carried out cooling process, so that the temperature of the nickel oxide ore of described process roasting is 200～300 degrees centigrade.Thus, the efficient that water logging is processed can be further improved, thereby the efficient that from nickel oxide ore, leaches rare earth element can be further improved.According to one embodiment of present invention, but described slaking and roasting process can carry out in being interrupted the stoves such as the static retort furnace quantity-produced rotary kiln of producing or tunnel furnace.According to one embodiment of present invention, comprise that further the flue gas with the roasting output discharges behind alkali liquor absorption, and will add water agitation leach rare earth after the rare-earth oxidation nickel minerals is cooled to 200-300 ℃ through containing of roasting, more after filtration or siphon will contain re dip solution and undissolved leached mud solid-liquid separation.Wherein, according to embodiments of the invention, the alkali lye that can adopt is NaOH, Na
2CO
3, CaO or ammoniacal liquor.According to one embodiment of present invention, described roasting is the acid adding roasting.Thus, the efficient of roasting can be further improved, thereby the efficient that from nickel oxide ore, leaches rare earth element can be further improved.According to one embodiment of present invention, adopt sulfuric acid to carry out described acid adding roasting.Thus, can further improve the efficient of roasting, thereby can further improve the efficient that from nickel oxide ore, leaches rare earth element, and can reduce the corrosion to equipment and materials.
At last, described nickel oxide ore through roasting is carried out water logging process, in order to obtain to contain leach liquor and the leached mud of rare earth element.According to one embodiment of present invention, described is 1:3～10 through the nickel oxide ore of roasting and the ratio of water.Thus, the efficient of leaching can be further improved, thereby the efficient that from nickel oxide ore, leaches rare earth element can be further improved.According to embodiments of the invention, before described nickel oxide ore through roasting is carried out the water logging processing, described Oxidation Leaching nickel minerals through roasting is carried out cooling process, so that the temperature in the Oxidation Leaching ore deposit of described process roasting is 200～300 degrees centigrade.According to one embodiment of present invention, further comprise by filtering or siphon separates the described leach liquor that contains rare earth element with described leached mud.According to one embodiment of present invention, under 20～90 degrees centigrade, carry out described separation.Thus, separation efficiency can be further improved, thereby the efficient that leaches rare earth element from nickel oxide ore can be further improved.According to embodiments of the invention, can in the mixture of leach liquor and leached mud, add flocculation agent, carry out again described solid-liquid separation.Thus, can further improve the efficient of separation.According to embodiments of the invention, be not particularly limited for the mode of carrying out the water logging processing.According to one embodiment of present invention, water logging is processed and can be adopted single drill traverse to go out, and also can adopt common stream or adverse current to leach continuously.And according to one embodiment of present invention, can wash leached mud, and washings is mixed with leach liquor, thereby the organic efficiency of raising rare earth element.
Below in conjunction with embodiment the solution of the present invention is made an explanation.It will be understood to those of skill in the art that the following examples only are used for explanation the present invention, and should not be considered as limiting scope of the present invention.Unreceipted concrete technology or condition among the embodiment are carried out according to the document in this area described technology or condition or according to product description.The unreceipted person of production firm of agents useful for same or instrument, being can be by the conventional products of commercial acquisition.
Embodiment 1:
The present embodiment adopts contains the rare-earth oxidation nickel minerals, and its main component is as shown in table 1 below:
Table 1
| Unit | % | % | % | % | % | % | % | % |
| Element | Fe | Al | Ni | Ca | Mg | Mn | Sc | Y |
| Content | 42.61 | 2.08 | 1.08 | 0.13 | 1.61 | 0.66 | 0.0031 | 0.00134 |
Wherein, in this nickel oxide ore, the content of major impurity iron is higher than ree content far away, and the content of Fe is 13745 times of rare earth Sc, is 31798 times of Rare Earth Y.
At first, get the above-mentioned nickel oxide ore of 200g and 90g concentration and be 98% the vitriol oil and mix and stir, in order to obtain mixture, namely the part by weight of nickel oxide ore and the vitriol oil is 1:0.45.Then, place 180 ℃ of thermostat containers to carry out slaking said mixture and take out after 4 hours, place retort furnace, under 650 ℃, carried out roasting 4 hours.Then, take out the nickel oxide ore through roasting, be cooled to 200 ℃, and get 200g through the nickel oxide ore of roasting, to wherein adding 1400mL water, and in 60 ℃ of lower stirrings, carry out water logging and processed 4 hours, in order to obtain to contain leach liquor and the leached mud of rare earth element.
Then, the leach liquor of above-mentioned acquisition carried out analyzing and testing.By the result as can be known, the pH of leach liquor is 0.59, and its main component is as shown in table 2 below:
Table 2
| Unit | g/L | g/L | g/L | g/L | g/L | g/L | mg/L | mg/L |
| Element | Fe | Al | Ni | Ca | Mg | Mn | Sc | Y |
| Content | 1.1 | 2.47 | 1.44 | 0.14 | 1.73 | 1.02 | 5.18 | 2.23 |
Based on table 1 and table 2, calculate: the Fe leaching yield is 2.0%, the Ni leaching yield is 100%, the Sc leaching yield is 100%, the Y leaching yield is 99.6%.Hence one can see that, has valency rare earth Sc and Y major part to transfer in the leach liquor, obtained effective leaching, and the leaching yield of valuable element Ni is also very high, and major impurity Fe only has on a small quantity and transfers in the leach liquor.
Embodiment 2:
Getting the 200g embodiment 1 described rare-earth oxidation nickel minerals that contains, is that 98% the vitriol oil mixes and stirs with 120g concentration, in order to obtain mixture, namely the part by weight of nickel oxide ore and the vitriol oil is 1:0.6.Place 180 ℃ of thermostat containers to carry out slaking said mixture and take out after 4 hours, place retort furnace, under 650 ℃, carried out roasting 4 hours.Then, take out the nickel oxide ore through roasting, be cooled to 200 ℃, and get 200g through the nickel oxide ore of roasting, to wherein adding 1400mL water, and in 60 ℃ of lower stirrings, carry out water logging and processed 4 hours, in order to obtain to contain leach liquor and the leached mud of rare earth element.
Then, the leach liquor of above-mentioned acquisition carried out analyzing and testing.By the result as can be known, the pH of leach liquor is 0.67, and its main component is as shown in table 3 below:
Table 3
| Unit | g/L | g/L | g/L | g/L | g/L | g/L | mg/L |
| Element | Fe | Al | Ni | Ca | Mg | Mn | Sc |
| Content | 5.59 | 2.44 | 1.38 | 0.12 | 1.36 | 0.8 | 5.04 |
Based on table 1 and table 3, calculate: the Fe leaching yield is 10.4%, the Ni leaching yield is 100%, the Sc leaching yield is 100%.Hence one can see that, has valency rare earth Sc major part to transfer in the leach liquor, obtained effective leaching, and the leaching yield of valuable element Ni is also very high, and major impurity Fe only has on a small quantity and transfers in the leach liquor.
Comparative example 1 as can be known, the leach liquor that the concentration ratio embodiment 1 of impurity F e obtains in the leach liquor that the present embodiment obtains is high, this may be because the part by weight of nickel oxide ore and the vitriol oil is higher in the present embodiment.
Embodiment 3:
Getting the 200g embodiment 1 described rare-earth oxidation nickel minerals that contains, is that 98% the vitriol oil mixes and stirs with 120g concentration, in order to obtain mixture, namely the part by weight of nickel oxide ore and the vitriol oil is 1:0.6.Place 180 ℃ of thermostat containers to carry out slaking said mixture and take out after 4 hours, place retort furnace, under 680 ℃, carried out roasting 4 hours.Then, take out the nickel oxide ore through roasting, be cooled to 200 ℃, and get 200g through the nickel oxide ore of roasting, to wherein adding 1400mL water, and in 60 ℃ of lower stirrings, carry out water logging and processed 4 hours, in order to obtain to contain leach liquor and the leached mud of rare earth element.
Then, the leach liquor of above-mentioned acquisition carried out analyzing and testing.By the result as can be known, the pH of leach liquor is 0.87, and its main component is as shown in table 4 below:
Table 4
| Unit | g/L | g/L | g/L | g/L | g/L | g/L | mg/L |
| Element | Fe | Al | Ni | Ca | Mg | Mn | Sc |
| Content | 0.18 | 0.48 | 1.36 | 0.18 | 1.60 | 0.88 | 4.92 |
Based on table 1 and table 4, calculate: the Fe leaching yield is 0.28%, the Ni leaching yield is 84.5%, the Sc leaching yield is 95.2%.Hence one can see that, has valency rare earth Sc major part to transfer in the leach liquor, obtained effective leaching, and the leaching yield of valuable element Ni is also very high, and major impurity Fe only has on a small quantity and transfers in the leach liquor.
Comparative example 2 as can be known, impurity F e is low with the leach liquor of concentration ratio embodiment 2 acquisitions of Al in the leach liquor that the present embodiment obtains, this may with the present embodiment in maturing temperature higher relevant.
Comparative Examples 1:
Getting the 200g embodiment 1 described rare-earth oxidation nickel minerals that contains, is that 98% the vitriol oil mixes and stirs with 45g concentration, in order to obtain mixture, namely the part by weight of nickel oxide ore and the vitriol oil is 1:0.225.Place 180 ℃ of thermostat containers to carry out slaking said mixture and take out after 4 hours, place retort furnace, under 650 ℃, carried out roasting 4 hours.Then, take out the nickel oxide ore through roasting, be cooled to 200 ℃, and get 200g through the nickel oxide ore of roasting, to wherein adding 1400mL water, and in 60 ℃ of lower stirrings, carry out water logging and processed 4 hours, in order to obtain to contain leach liquor and the leached mud of rare earth element.
Then, the leach liquor of above-mentioned acquisition carried out analyzing and testing.By the result as can be known, the pH of leach liquor is 0.57, and its main component is as shown in table 5 below:
Table 5
| Unit | g/L | g/L | g/L | g/L | g/L | g/L | mg/L |
| Element | Fe | Al | Ni | Ca | Mg | Mn | Sc |
| Content | 0.025 | 0.41 | 0.88 | 0.18 | 1.35 | 0.79 | 1.36 |
Based on table 1 and table 5, calculate: the Fe leaching yield is 0.04%, the Ni leaching yield is 58.1%, the Sc leaching yield is 27.9%.Hence one can see that, transfers on a small quantity in the leach liquor although major impurity Fe only has, and has the leaching yield of valency rare earth Sc, valuable element Ni on the low side.
This Comparative Examples and embodiment 1,2,3 are compared as can be known, when the part by weight of nickel oxide ore and the vitriol oil is very low, have valency rare earth Sc, valuable element Ni etc. effectively not to leach.
Comparative Examples 2:
Get the 200g embodiment 1 described rare-earth oxidation nickel minerals that contains, be that 98% the vitriol oil (being that nickel oxide ore is 1:0.225 with the part by weight of the vitriol oil) and 1400mL water mix with 45g concentration directly, and in 60 ℃ of lower stirrings, carry out water logging and processed 4 hours, in order to obtain to contain leach liquor and the leached mud of rare earth element.
Then, the leach liquor of above-mentioned acquisition carried out analyzing and testing.By the result as can be known, the pH of leach liquor is 0.08, and its main component is as shown in table 6 below:
Table 6
| Unit | g/L | g/L | g/L | g/L | g/L | g/L | mg/L |
| Element | Fe | Al | Ni | Ca | Mg | Mn | Sc |
| Content | 2.46 | 0.84 | 0.18 | 0.24 | 0.74 | 0.18 | 1.36 |
Based on table 1 and table 6, calculate: the Fe leaching yield is 4.0%, the Ni leaching yield is 11.7%, the Sc leaching yield is 27.4%.
With this Comparative Examples and embodiment 1,2,3 and Comparative Examples 1 compare as can be known, when the part by weight of nickel oxide ore and the vitriol oil very low, and without slaking and roasting and when directly adding Ore Leaching, have the leaching yield of valency rare earth Sc and valuable element Ni on the low side, the concentration ratio of major impurity Fe in leach liquor is through the height of overcuring and calcination steps simultaneously.
Embodiment 4:
Getting the 100g embodiment 1 described rare-earth oxidation nickel minerals that contains, is that 98% the vitriol oil mixes and stirs with 60g concentration, in order to obtain mixture, namely the part by weight of nickel oxide ore and the vitriol oil is 1:0.6.Place 150 ℃ of thermostat containers to carry out slaking after 4 hours said mixture, take out and place retort furnace, under 680 ℃, carried out roasting 2 hours.Then, take out the nickel oxide ore through roasting, be cooled to 220 ℃, to wherein adding entry, and in 60 ℃ of lower stirrings, carry out water logging and processed 4 hours, in order to obtain the leach liquor that leached mud and 660mL contain rare earth element.
Then, the leach liquor of above-mentioned acquisition carried out analyzing and testing.By the result as can be known, the pH of leach liquor is 1.54, and its main component is as shown in table 7 below:
Table 7
| Unit | g/L | g/L | mg/L | mg/L |
| Element | Fe | Ni | Sc | Y |
| Content | 2.56 | 1.56 | 4.76 | 1.88 |
Based on table 1 and table 7, calculate: the Fe leaching yield is 4.29%, the Ni leaching yield is 90.1%, the Sc leaching yield is 90.5%, the Y leaching yield is 92.6%.In addition, leached mud analysis is drawn: iron content 47.2% in the leached mud.Hence one can see that, and valuable element rare earth Sc and Y major part are transferred in the leach liquor, and the leaching yield of valuable element Ni is also very high, and major impurity Fe only has on a small quantity and transfers in the leach liquor.
Embodiment 5:
Getting the 100g embodiment 1 described rare-earth oxidation nickel minerals that contains, is that 98% the vitriol oil mixes and stirs with 60g concentration, in order to obtain mixture, namely the part by weight of nickel oxide ore and the vitriol oil is 1:0.6.Place 150 ℃ of thermostat containers to carry out slaking after 2 hours said mixture, take out and place retort furnace, under 680 ℃, carried out roasting 2 hours.Then, take out the nickel oxide ore through roasting, be cooled to 220 ℃, to wherein adding entry, and in 60 ℃ of lower stirrings, carry out water logging and processed 4 hours, in order to obtain the leach liquor that leached mud and 650mL contain rare earth element.
Then, the leach liquor of above-mentioned acquisition carried out analyzing and testing.By the result as can be known, the pH of leach liquor is 1.96, and its main component is as shown in table 8 below:
Table 8
| Unit | g/L | g/L | mg/L | mg/L |
| Element | Fe | Ni | Sc | Y |
| Content | 1.76 | 1.69 | 4.66 | 1.90 |
Based on table 1 and table 8, calculate: the Fe leaching yield is 2.90%, the Ni leaching yield is 96.1%, the Sc leaching yield is 87.3%, the Y leaching yield is 92.2%.In addition, leached mud analysis is drawn: iron content 48.7% in the leached mud.Hence one can see that, has valency rare earth Sc and Y major part to transfer in the leach liquor, and the leaching yield of valuable element Ni is also very high, and major impurity Fe only has on a small quantity and transfers in the leach liquor.
Comparative Examples 3:
Get the 100g embodiment 1 described rare-earth oxidation nickel minerals that contains, with 60g concentration be 98% H
2SO
4Mixing also stirs in order to obtain mixture, and namely the part by weight of nickel oxide ore and the vitriol oil is 1:0.6.Said mixture is directly placed retort furnace, under 300 ℃, carried out roasting 4 hours.Then, take out the nickel oxide ore through roasting, be cooled to 220 ℃, to wherein adding entry, and in 60 ℃ of lower stirrings, carry out water logging and processed 4 hours, in order to obtain the leach liquor that leached mud and 720mL contain rare earth element.
Then, the leach liquor of above-mentioned acquisition carried out analyzing and testing.By the result as can be known, the pH of leach liquor is 1.83, and its main component is as shown in table 9 below:
Table 9
| Unit | g/L | g/L | mg/L | mg/L |
| Element | Fe | Ni | Sc | Y |
| Content | 41.51 | 1.51 | 4.32 | 1.76 |
Based on table 1 and table 9, calculate: the Fe leaching yield is 75.9%, the Ni leaching yield is 95.1%, the Sc leaching yield is 89.6%, the Y leaching yield is 94.6%.In addition, leached mud analysis is drawn: iron content 23.2% in the leached mud.Hence one can see that, although there is the leaching yield of valency rare earth Sc and valuable element Ni very high,, simultaneously major impurity Fe is a large amount of dissolved and transfer in the leach liquor.
This Comparative Examples is compared as can be known with embodiment 4 and 5, and maturation stage and high maturing temperature can reduce the stripping of Fe, thereby can improve the concentration ratio of leach liquor middle-weight rare earths and impurity.
Embodiment 6:
Get the 200g embodiment 1 described rare-earth oxidation nickel minerals that contains, with 90g concentration be 98% dense H
2SO
4Mixing also stirs, and namely the part by weight of described nickel oxide ore and the described vitriol oil is 1:0.45.Said mixture is placed 80 ℃ of thermostat container slakings 4 hours.After taking out grog, place retort furnace, in 700 ℃ of lower roastings 4 hours.Then, take out the nickel oxide ore through roasting, be cooled to 200 ℃, the 200g that gets wherein adds 1400mL water, 80 ℃ of stirrings, carries out water logging and processes 4 hours.After the solid-liquid separation, the leach liquor that contains rare earth element is carried out analyzing and testing, its pH is 0.97, and its main component is as shown in table 10 below:
Table 10
| Unit | g/L | g/L | g/L | g/L | g/L | mg/L | mg/L |
| Element | Fe | Al | Ni | Mg | Mn | Sc | Y |
| Content | 0.35 | 0.60 | 0.99 | 1.10 | 0.65 | 3.96 | 1.68 |
Based on table 1 and as seen from Table 10, valuable element rare earth Sc major part is transferred in the leach liquor, obtained effective leaching, the leaching yield of valuable element Ni is also very high, and major impurity Fe only has and transfers on a small quantity in the leach liquor, is respectively: Fe leaching yield 0.6%, Ni leaching yield 66.8%, Sc leaching yield 93.1%, Y leaching yield 91.4%.
Embodiment 7:
Get the 200g embodiment 1 described rare-earth oxidation nickel minerals that contains, with 180g concentration be 98% dense H
2SO
4Mixing also stirs, and namely the part by weight of described nickel oxide ore and the described vitriol oil is 1:0.9.Said mixture is placed 80 ℃ of thermostat container slakings 4 hours.After taking out grog, place retort furnace, 700 ℃ of roastings 2 hours.After taking out roasting material, be cooled to 200 ℃, the 200g that gets wherein added 1400mL water, 80 ℃ of agitation leachs 4 hours.After the solid-liquid separation, the leach liquor that contains rare earth element is carried out analyzing and testing, its pH is 1.01, and its main component is as shown in table 11 below:
Table 11
| Unit | g/L | g/L | g/L | g/L | g/L | g/L | mg/L | mg/L |
| Element | Fe | Al | Ni | Ca | Mg | Mn | Sc | Y |
| Content | 0.79 | 0.85 | 0.98 | 0.11 | 1.06 | 0.44 | 4.29 | 1.70 |
Based on table 1 and as seen from Table 11, valuable element rare earth Sc major part is transferred in the leach liquor, obtained effective leaching, the leaching yield of valuable element Ni is also very high, and major impurity Fe only has and transfers on a small quantity in the leach liquor, is respectively: Fe leaching yield 1.35%, Ni leaching yield 66.2%, Sc leaching yield 100%, Y leaching yield 92.6%.
Embodiment 8:
Get the 200g embodiment 1 described rare-earth oxidation nickel minerals that contains, with 180g concentration be 98% dense H
2SO
4Mixing also stirs, and namely the part by weight of described nickel oxide ore and the described vitriol oil is 1:0.9.Said mixture is placed 80 ℃ of thermostat container slakings 4 hours.After taking out grog, place retort furnace, 700 ℃ of roastings 4 hours.After taking out roasting material, be cooled to 200 ℃, the 200g that gets wherein added 1400mL water, 80 ℃ of agitation leachs 4 hours.After the solid-liquid separation, the leach liquor that contains rare earth element is carried out analyzing and testing, its pH is 0.85, and its main component is as shown in table 12 below:
Table 12
| Unit | g/L | g/L | g/L | g/L | g/L | g/L | mg/L |
| Element | Fe | Al | Ni | Ca | Mg | Mn | Sc |
| Content | 0.26 | 1.26 | 1.24 | 0.15 | 1.45 | 0.81 | 5.32 |
Based on table 1 and as seen from Table 12, valuable element rare earth Sc major part is transferred in the leach liquor, has obtained effective leaching, and the leaching yield of valuable element Ni is also very high, and major impurity Fe only has and transfers on a small quantity in the leach liquor, is respectively: Fe leaching yield 0.4%, Ni leaching yield 79.3%, Sc leaching yield 100%.
Comparative Examples 4:
Get the 200g embodiment 1 described rare-earth oxidation nickel minerals that contains, with 180g concentration be 98% dense H
2SO
4Mixing also stirs.Said mixture is placed 80 ℃ of slakings of thermostat container 4 hours.After taking out grog, place retort furnace, 400 ℃ of roastings 4 hours.After taking out roasting material, be cooled to 200 ℃, the 200g that gets wherein added 1400mL water, 80 ℃ of agitation leachs 4 hours.Leach liquor is carried out analyzing and testing,, its main component is as shown in table 13 below:
Table 13
| Unit | g/L | g/L | g/L | g/L | g/L | g/L | mg/L |
| Element | Fe | Al | Ni | Ca | Mg | Mn | Sc |
| Content | 19.1 | 1.69 | 0.84 | 0.16 | 0.75 | 0.46 | 3.18 |
Based on table 1 and as seen from Table 13, Fe leaching yield 53.4%, Ni leaching yield 92.7%, Sc leaching yield 100%.The Fe leaching yield is too high.
In the description of this specification sheets, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or the example in conjunction with specific features, structure, material or the characteristics of this embodiment or example description.In this manual, the schematic statement of above-mentioned term not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or characteristics can be with suitable mode combinations in any one or more embodiment or example.
Although illustrated and described embodiments of the invention, those having ordinary skill in the art will appreciate that: in the situation that do not break away from principle of the present invention and aim can be carried out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is limited by claim and equivalent thereof.
Claims (13)
1. method that leaches rare earth element from nickel oxide ore, described nickel oxide ore contains rare earth element, it is characterized in that, and described method comprises the following steps:
Described nickel oxide ore is mixed with the vitriol oil, in order to obtain the first mixture;
Described the first mixture is carried out slaking, in order to obtain the nickel oxide ore through overcuring;
Described nickel oxide ore through overcuring is carried out roasting, in order to obtain the nickel oxide ore through roasting; And
Described nickel oxide ore through roasting is carried out water logging process, in order to obtain to contain leach liquor and the leached mud of rare earth element.
2. method according to claim 1, it is characterized in that, described rare earth element refers at least a of lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu) and scandium (Sc) and yttrium (Y) for being selected from.
3. method according to claim 2 is characterized in that, the total content of described rare earth element is the 0.001-0.9 % by weight.
4. method according to claim 1 is characterized in that, the part by weight of described nickel oxide ore and the described vitriol oil is 1:0.3～0.9.
5. method according to claim 4 is characterized in that, the part by weight of described nickel oxide ore and the described vitriol oil is 1:0.4～0.6.
6. method according to claim 1 is characterized in that, carries out described slaking 1～8 hour under 40～180 degrees centigrade.
7. method according to claim 6 is characterized in that, described slaking is carried out under 60～150 degrees centigrade.
8. method according to claim 1 is characterized in that, carries out described roasting 1～8 hour under 180～750 degrees centigrade.
9. method according to claim 1 is characterized in that, carries out described roasting 1～4 hour under 200～700 degrees centigrade.
10. method according to claim 1, it is characterized in that, before described nickel oxide ore through roasting is carried out the water logging processing, described nickel oxide ore through roasting is carried out cooling process, so that the temperature of the nickel oxide ore of described process roasting is 200～300 degrees centigrade.
11. method according to claim 1 is characterized in that, further comprises by filtration or siphon the described leach liquor that contains rare earth element is separated with described leached mud.
12. method according to claim 11 is characterized in that, carries out described separation under 20～90 degrees centigrade.
13. method according to claim 1 is characterized in that, described is 1:3～10 through the nickel oxide ore of roasting and the ratio of water.
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