CN102864319B - 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 the method leaching rare earth element from nickel oxide ore.
Background technology
There is no the effective ways obtaining rare earth element from nickel oxide ore at present.
Summary of the invention
The present invention is intended at least to solve one of technical problem existed in prior art.For this reason, one object of the present invention is to propose a kind ofly to have and effectively can leach the method for rare earth element from nickel oxide ore.
According to the method leaching rare earth element from nickel oxide ore of the embodiment of the present invention, comprise the following steps: described nickel oxide ore to mix with the vitriol oil, to obtain the first mixture; Described first mixture is carried out slaking, to obtain the nickel oxide ore through overcuring; The described nickel oxide ore through overcuring is carried out roasting, to obtain the nickel oxide ore through roasting; And the described nickel oxide ore through roasting is carried out Soaking treatment, so that the leach liquor obtained containing rare earth element and leached mud.Utilize leaching the method for rare earth element from nickel oxide ore and effectively can leach rare earth element from nickel oxide ore according to the embodiment of the present invention, thus can recovering rare earth element.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is the schematic flow sheet of the method leaching rare earth element according to an embodiment of the invention from nickel oxide ore.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
According to an aspect of the present invention, the present invention proposes a kind of method leaching rare earth element from nickel oxide ore.According to embodiments of the invention, with reference to figure 1, the method comprises the following steps:
First, described nickel oxide ore is mixed with the vitriol oil, to obtain the first mixture, i.e. solidliquid mixture, and described first mixture is carried out slaking, to obtain the nickel oxide ore through overcuring.According to some embodiments of the present invention, the type that may 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 the rare earth (RE) of low levels, nickel (Ni) and other element as the oxide compound of aluminium (Al) and iron (Fe) etc., according to concrete example, nickel oxide ore, for containing rare earth red soil nickel ore, should mainly comprise micro-pact (0.001-0.9) %RE, about (0.1-4.0) %Ni, about (0.2-20) %Al peace treaty (10-60) %Fe and other element such as Co, Si, Mg, Ca, Cr, Mn containing rare earth red soil nickel ore.Contriver is surprised to find, and method of the present invention is particularly suitable for the above-mentioned water logging containing rare earth red soil nickel ore and obtains rare earth element.According to some embodiments of the present invention, the type of the rare earth element that method of the present invention can be adopted to reclaim is not particularly limited.According to one embodiment of present invention, described rare earth element is for being selected from least one referring to 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).Thus, effectively these rare earth elements can be reclaimed from nickel oxide ore.According to one embodiment of present invention, the total content of described rare earth element is 0.001-0.9 % by weight.Thus, effectively rare earth element can be leached from nickel oxide ore further.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 efficiency of slaking can be improved, thus the efficiency leaching rare earth element from nickel oxide ore can be improved further.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, the efficiency utilizing the vitriol oil to carry out maturation process can be improved further, thus the efficiency leaching rare earth element from nickel oxide ore can be improved further.According to one embodiment of present invention, under 40 ~ 180 degrees Celsius, described slaking 1 ~ 8 hour is carried out.Thus, the efficiency utilizing the vitriol oil to carry out maturation process can be improved further, thus the efficiency leaching rare earth element from nickel oxide ore can be improved further.According to one embodiment of present invention, described slaking is carried out under 60 ~ 150 degrees Celsius.Thus, the efficiency utilizing the vitriol oil to carry out maturation process can be improved further, thus the efficiency leaching rare earth element from nickel oxide ore can be improved further.According to embodiments of the invention, the method maintained containing the curing temperature after rare-earth oxidation nickel minerals mixing sulfuric acid is not particularly limited, and can carry out holding temperature by utilizing the heat discharged in mixing sulfuric acid process; Or be placed in the container of insulation by the first mixture, take the mode of external heat to maintain curing temperature, wherein type of heating can heat for Electric heating or the high-temperature flue gas utilizing roasting to generate.
Next, the described nickel oxide ore through overcuring is carried out roasting, to obtain the nickel oxide ore through roasting.According to embodiments of the invention, can the condition of calcination process be carried out and be not particularly limited, can the compound such as oxide compound of water logging as long as rare earth element can be converted into.According to one embodiment of present invention, under 180 ~ 750 degrees Celsius, described roasting 1 ~ 8 hour is carried out.Thus, the efficiency of roasting can be improved, thus the efficiency leaching rare earth element from nickel oxide ore can be improved further.According to one embodiment of present invention, under 200 ~ 700 degrees Celsius, described roasting 1 ~ 4 hour is carried out.Thus, the efficiency of roasting can be improved further, thus the efficiency leaching rare earth element from nickel oxide ore can be improved further.According to one embodiment of present invention, before Soaking treatment is carried out to the described nickel oxide ore through roasting, cooling process is carried out to the described nickel oxide ore through roasting, make the temperature of the described nickel oxide ore through roasting be 200 ~ 300 degrees Celsius.Thus, the efficiency of Soaking treatment can be improved further, thus the efficiency leaching rare earth element from nickel oxide ore can be improved further.According to one embodiment of present invention, described slaking and roasting process can be interrupted static produce retort furnace, can carry out in the stove such as quantity-produced rotary kiln or tunnel furnace.According to one embodiment of present invention, comprise further and the flue gas of roasting output is discharged after alkali liquor absorption, and by through roasting be cooled to 200-300 DEG C containing rare-earth oxidation nickel minerals after to add water agitation leach rare earth, more after filtration or siphon will containing 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 acid adding roasting.Thus, the efficiency of roasting can be improved further, thus the efficiency leaching rare earth element from nickel oxide ore can be improved further.According to one embodiment of present invention, sulfuric acid is adopted to carry out described acid adding roasting.Thus, the efficiency of roasting can be improved further, thus the efficiency leaching rare earth element from nickel oxide ore can be improved further, and the corrosion to equipment and materials can be reduced.
Finally, the described nickel oxide ore through roasting is carried out Soaking treatment, so that the leach liquor obtained containing rare earth element and leached mud.According to one embodiment of present invention, the ratio of the described nickel oxide ore through roasting and water is 1:3 ~ 10.Thus, the efficiency of leaching can be improved further, thus the efficiency leaching rare earth element from nickel oxide ore can be improved further.According to embodiments of the invention, before carrying out Soaking treatment to the described nickel oxide ore through roasting, carry out cooling process to the described Oxidation Leaching nickel minerals through roasting, the temperature making the described Oxidation Leaching ore deposit through roasting is 200 ~ 300 degrees Celsius.According to one embodiment of present invention, comprise further by filter or the described leach liquor containing rare earth element is separated with described leached mud by siphon.According to one embodiment of present invention, under 20 ~ 90 degrees Celsius, described separation is carried out.Thus, separation efficiency can be improved further, thus the efficiency leaching rare earth element from nickel oxide ore can be improved further.According to embodiments of the invention, flocculation agent can be added in the mixture of leach liquor and leached mud, then carry out described solid-liquid separation.Thus, the efficiency of separation can be improved further.According to embodiments of the invention, be not particularly limited for the mode of carrying out Soaking treatment.According to one embodiment of present invention, Soaking treatment can adopt single drill traverse to go out, and common stream or adverse current also can be adopted to leach continuously.And according to one embodiment of present invention, can wash leached mud, and washings is mixed with leach liquor, thus improve the organic efficiency of 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 for illustration of the present invention, and should not be considered as limiting scope of the present invention.Unreceipted concrete technology or condition in embodiment, according to the technology described by the document in this area or condition or carry out according to product description.Agents useful for same or the unreceipted production firm person of instrument, being can by the conventional products of commercial acquisition.
Embodiment 1:
What the present embodiment adopted contains 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 far away higher than ree content, and the content of Fe is 13745 times of rare earth Sc, is 31798 times of Rare Earth Y.
First, get the vitriol oil that the above-mentioned nickel oxide ore of 200g and 90g concentration are 98% and mix and stir, to obtain mixture, namely the part by weight of nickel oxide ore and the vitriol oil is 1:0.45.Then, said mixture is placed in 180 DEG C of thermostat containers and carries out slaking and take out after 4 hours, be placed in retort furnace, at 650 DEG C, carry out roasting 4 hours.Then, take out the nickel oxide ore through roasting, be cooled to 200 DEG C, and get the nickel oxide ore of 200g through roasting, add 1400mL water wherein, and stir at 60 DEG C, carry out Soaking treatment 4 hours, so that the leach liquor obtained containing rare earth element and leached mud.
Then, analyzing and testing is carried out to the leach liquor of above-mentioned acquisition.From result, 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: Fe leaching yield is 2.0%, Ni leaching yield is 100%, Sc leaching yield is 100%, Y leaching yield is 99.6%.It can thus be appreciated that have valency rare earth Sc and Y major part to transfer in leach liquor, obtain effective leaching, the leaching yield of valuable element Ni is also very high, and major impurity Fe only has and transfers in leach liquor on a small quantity.
Embodiment 2:
Get described in 200g embodiment 1 containing rare-earth oxidation nickel minerals, the vitriol oil being 98% with 120g concentration mixes and stirs, to obtain mixture, namely the part by weight of nickel oxide ore and the vitriol oil is 1:0.6.Said mixture is placed in 180 DEG C of thermostat containers to carry out slaking and take out after 4 hours, is placed in retort furnace, at 650 DEG C, carries out roasting 4 hours.Then, take out the nickel oxide ore through roasting, be cooled to 200 DEG C, and get the nickel oxide ore of 200g through roasting, add 1400mL water wherein, and stir at 60 DEG C, carry out Soaking treatment 4 hours, so that the leach liquor obtained containing rare earth element and leached mud.
Then, analyzing and testing is carried out to the leach liquor of above-mentioned acquisition.From result, 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: Fe leaching yield is 10.4%, Ni leaching yield is 100%, Sc leaching yield is 100%.It can thus be appreciated that have valency rare earth Sc major part to transfer in leach liquor, obtain effective leaching, the leaching yield of valuable element Ni is also very high, and major impurity Fe only has and transfers in leach liquor on a small quantity.
Comparative example 1 is known, and the leach liquor that in the leach liquor that the present embodiment obtains, the concentration ratio embodiment 1 of impurity F e obtains is high, and this may be because the part by weight of nickel oxide ore and the vitriol oil is higher in the present embodiment.
Embodiment 3:
Get described in 200g embodiment 1 containing rare-earth oxidation nickel minerals, the vitriol oil being 98% with 120g concentration mixes and stirs, to obtain mixture, namely the part by weight of nickel oxide ore and the vitriol oil is 1:0.6.Said mixture is placed in 180 DEG C of thermostat containers to carry out slaking and take out after 4 hours, is placed in retort furnace, at 680 DEG C, carries out roasting 4 hours.Then, take out the nickel oxide ore through roasting, be cooled to 200 DEG C, and get the nickel oxide ore of 200g through roasting, add 1400mL water wherein, and stir at 60 DEG C, carry out Soaking treatment 4 hours, so that the leach liquor obtained containing rare earth element and leached mud.
Then, analyzing and testing is carried out to the leach liquor of above-mentioned acquisition.From result, 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: Fe leaching yield is 0.28%, Ni leaching yield is 84.5%, Sc leaching yield is 95.2%.It can thus be appreciated that have valency rare earth Sc major part to transfer in leach liquor, obtain effective leaching, the leaching yield of valuable element Ni is also very high, and major impurity Fe only has and transfers in leach liquor on a small quantity.
Comparative example 2 is known, and the leach liquor that in the leach liquor that the present embodiment obtains, the concentration ratio embodiment 2 of impurity F e and Al obtains is low, and this may be higher with the maturing temperature in the present embodiment relevant.
Comparative example 1:
Get described in 200g embodiment 1 containing rare-earth oxidation nickel minerals, the vitriol oil being 98% with 45g concentration mixes and stirs, to obtain mixture, namely the part by weight of nickel oxide ore and the vitriol oil is 1:0.225.Said mixture is placed in 180 DEG C of thermostat containers to carry out slaking and take out after 4 hours, is placed in retort furnace, at 650 DEG C, carries out roasting 4 hours.Then, take out the nickel oxide ore through roasting, be cooled to 200 DEG C, and get the nickel oxide ore of 200g through roasting, add 1400mL water wherein, and stir at 60 DEG C, carry out Soaking treatment 4 hours, so that the leach liquor obtained containing rare earth element and leached mud.
Then, analyzing and testing is carried out to the leach liquor of above-mentioned acquisition.From result, 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: Fe leaching yield is 0.04%, Ni leaching yield is 58.1%, Sc leaching yield is 27.9%.It can thus be appreciated that, transfer in leach liquor on a small quantity although major impurity Fe only has, have the leaching yield of valency rare earth Sc, valuable element Ni on the low side.
This comparative example and embodiment 1,2,3 are compared known, when the part by weight of nickel oxide ore and the vitriol oil is very low, has valency rare earth Sc, valuable element Ni etc. effectively not to leach.
Comparative example 2:
Get described in 200g embodiment 1 containing rare-earth oxidation nickel minerals, with 45g concentration be directly 98% the vitriol oil (namely nickel oxide ore is 1:0.225 with the part by weight of the vitriol oil) and 1400mL water mix, and stir at 60 DEG C, carry out Soaking treatment 4 hours, so that the leach liquor obtained containing rare earth element and leached mud.
Then, analyzing and testing is carried out to the leach liquor of above-mentioned acquisition.From result, 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: Fe leaching yield is 4.0%, Ni leaching yield is 11.7%, Sc leaching yield is 27.4%.
This comparative example and embodiment 1,2,3 and comparative example 1 are compared known, when the part by weight of nickel oxide ore and the vitriol oil is very low, and when directly adding Ore Leaching without slaking and roasting, have the leaching yield of valency rare earth Sc and valuable element Ni on the low side, simultaneously the concentration ratio of major impurity Fe in leach liquor is through the height of overcuring and calcination steps.
Embodiment 4:
Get described in 100g embodiment 1 containing rare-earth oxidation nickel minerals, the vitriol oil being 98% with 60g concentration mixes and stirs, to obtain mixture, namely the part by weight of nickel oxide ore and the vitriol oil is 1:0.6.Said mixture is placed in 150 DEG C of thermostat containers and carries out slaking after 4 hours, take out and be placed in retort furnace, at 680 DEG C, carry out roasting 2 hours.Then, take out the nickel oxide ore through roasting, be cooled to 220 DEG C, add water wherein, and stir at 60 DEG C, carry out Soaking treatment 4 hours, to obtain the leach liquor that leached mud and 660mL contain rare earth element.
Then, analyzing and testing is carried out to the leach liquor of above-mentioned acquisition.From result, 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: Fe leaching yield is 4.29%, Ni leaching yield is 90.1%, Sc leaching yield is 90.5%, Y leaching yield is 92.6%.In addition, carry out analysis to leached mud to draw: iron content 47.2% in leached mud.It can thus be appreciated that valuable element rare earth Sc and Y major part are transferred in leach liquor, the leaching yield of valuable element Ni is also very high, and major impurity Fe only has and transfers in leach liquor on a small quantity.
Embodiment 5:
Get described in 100g embodiment 1 containing rare-earth oxidation nickel minerals, the vitriol oil being 98% with 60g concentration mixes and stirs, to obtain mixture, namely the part by weight of nickel oxide ore and the vitriol oil is 1:0.6.Said mixture is placed in 150 DEG C of thermostat containers and carries out slaking after 2 hours, take out and be placed in retort furnace, at 680 DEG C, carry out roasting 2 hours.Then, take out the nickel oxide ore through roasting, be cooled to 220 DEG C, add water wherein, and stir at 60 DEG C, carry out Soaking treatment 4 hours, to obtain the leach liquor that leached mud and 650mL contain rare earth element.
Then, analyzing and testing is carried out to the leach liquor of above-mentioned acquisition.From result, 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: Fe leaching yield is 2.90%, Ni leaching yield is 96.1%, Sc leaching yield is 87.3%, Y leaching yield is 92.2%.In addition, carry out analysis to leached mud to draw: iron content 48.7% in leached mud.It can thus be appreciated that have valency rare earth Sc and Y major part to transfer in leach liquor, the leaching yield of valuable element Ni is also very high, and major impurity Fe only has and transfers in leach liquor on a small quantity.
Comparative example 3:
Get described in 100g embodiment 1 containing rare-earth oxidation nickel minerals, be the H of 98% with 60g concentration
2sO
4mix and stir to obtain mixture, namely the part by weight of nickel oxide ore and the vitriol oil is 1:0.6.Said mixture is directly placed in retort furnace, at 300 DEG C, carries out roasting 4 hours.Then, take out the nickel oxide ore through roasting, be cooled to 220 DEG C, add water wherein, and stir at 60 DEG C, carry out Soaking treatment 4 hours, to obtain the leach liquor that leached mud and 720mL contain rare earth element.
Then, analyzing and testing is carried out to the leach liquor of above-mentioned acquisition.From result, 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: Fe leaching yield is 75.9%, Ni leaching yield is 95.1%, Sc leaching yield is 89.6%, Y leaching yield is 94.6%.In addition, carry out analysis to leached mud to draw: iron content 23.2% in leached mud.It can thus be appreciated that, although there is the leaching yield of valency rare earth Sc and valuable element Ni very high, major impurity Fe is transferred in leach liquor by dissolving in a large number simultaneously.
Compare known by this comparative example and embodiment 4 and 5, maturation stage and high maturing temperature can reduce the stripping of Fe, thus can improve the concentration ratio of leach liquor middle-weight rare earths and impurity.
Embodiment 6:
Get described in 200g embodiment 1 containing rare-earth oxidation nickel minerals, be the dense H of 98% with 90g concentration
2sO
4mix and stir, namely the part by weight of described nickel oxide ore and the described vitriol oil is 1:0.45.Said mixture is placed in 80 DEG C of thermostat container slakings 4 hours.After taking out grog, be placed in retort furnace, roasting 4 hours at 700 DEG C.Then, take out the nickel oxide ore through roasting, be cooled to 200 DEG C, the 200g got wherein adds 1400mL water, 80 DEG C of stirrings, carries out Soaking treatment 4 hours.After solid-liquid separation, carry out analyzing and testing to the leach liquor containing rare earth element, 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 table 10 visible, valuable element rare earth Sc major part is transferred in leach liquor, obtain effective leaching, the leaching yield of valuable element Ni is also very high, and major impurity Fe only has and transfers in leach liquor on a small quantity, be respectively: Fe leaching yield 0.6%, Ni leaching yield 66.8%, Sc leaching yield 93.1%, Y leaching yield 91.4%.
Embodiment 7:
Get described in 200g embodiment 1 containing rare-earth oxidation nickel minerals, be the dense H of 98% with 180g concentration
2sO
4mix and stir, namely the part by weight of described nickel oxide ore and the described vitriol oil is 1:0.9.Said mixture is placed in 80 DEG C of thermostat container slakings 4 hours.After taking out grog, be placed in retort furnace, 700 DEG C of roastings 2 hours.After taking out roasting material, be cooled to 200 DEG C, the 200g got wherein added 1400mL water, 80 DEG C of agitation leachs 4 hours.After solid-liquid separation, carry out analyzing and testing to the leach liquor containing rare earth element, 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 table 11 visible, valuable element rare earth Sc major part is transferred in leach liquor, obtain effective leaching, the leaching yield of valuable element Ni is also very high, and major impurity Fe only has and transfers in leach liquor on a small quantity, be respectively: Fe leaching yield 1.35%, Ni leaching yield 66.2%, Sc leaching yield 100%, Y leaching yield 92.6%.
Embodiment 8:
Get described in 200g embodiment 1 containing rare-earth oxidation nickel minerals, be the dense H of 98% with 180g concentration
2sO
4mix and stir, namely the part by weight of described nickel oxide ore and the described vitriol oil is 1:0.9.Said mixture is placed in 80 DEG C of thermostat container slakings 4 hours.After taking out grog, be placed in retort furnace, 700 DEG C of roastings 4 hours.After taking out roasting material, be cooled to 200 DEG C, the 200g got wherein added 1400mL water, 80 DEG C of agitation leachs 4 hours.After solid-liquid separation, carry out analyzing and testing to the leach liquor containing rare earth element, 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 table 12 visible, valuable element rare earth Sc major part is transferred in leach liquor, obtains effective leaching, and the leaching yield of valuable element Ni is also very high, and major impurity Fe only has and transfers in leach liquor on a small quantity, be respectively: Fe leaching yield 0.4%, Ni leaching yield 79.3%, Sc leaching yield 100%.
Comparative example 4:
Get described in 200g embodiment 1 containing rare-earth oxidation nickel minerals, be the dense H of 98% with 180g concentration
2sO
4mix and stir.Said mixture is placed in thermostat container 80 DEG C of slakings 4 hours.After taking out grog, be placed in retort furnace, 400 DEG C of roastings 4 hours.After taking out roasting material, be cooled to 200 DEG C, the 200g got wherein added 1400mL water, 80 DEG C of agitation leachs 4 hours.Analyzing and testing is carried out to leach liquor, 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 table 13 visible, Fe leaching yield 53.4%, Ni leaching yield 92.7%, Sc leaching yield 100%.Fe leaching yield is too high.
In the description of this specification sheets, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalents thereof.
Claims (10)
1. leach a method for rare earth element from nickel oxide ore, described nickel oxide ore contains rare earth element, it is characterized in that, described method comprises the following steps:
Mixed with the vitriol oil by described nickel oxide ore, to obtain the first mixture, wherein, the part by weight of described nickel oxide ore and the described vitriol oil is 1:0.3 ~ 0.9;
Described first mixture is carried out slaking, to obtain the nickel oxide ore through overcuring;
The described nickel oxide ore through overcuring is carried out roasting, to obtain the nickel oxide ore through roasting; And
Under 60 degrees Celsius or 80 degrees Celsius, the described nickel oxide ore through roasting is carried out Soaking treatment, so that the leach liquor obtained containing rare earth element and leached mud,
Before Soaking treatment is carried out to the described nickel oxide ore through roasting, cooling process is carried out to the described nickel oxide ore through roasting, makes the temperature of the described nickel oxide ore through roasting be 200 ~ 300 degrees Celsius,
The total content of described rare earth element is 0.001-0.9 % by weight.
2. method according to claim 1, it is characterized in that, described rare earth element refers at least one 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 1, is characterized in that, the part by weight of described nickel oxide ore and the described vitriol oil is 1:0.4 ~ 0.6.
4. method according to claim 1, is characterized in that, carries out described slaking 1 ~ 8 hour under 40 ~ 180 degrees Celsius.
5. method according to claim 4, is characterized in that, described slaking is carried out under 60 ~ 150 degrees Celsius.
6. method according to claim 1, is characterized in that, carries out described roasting 1 ~ 8 hour under 180 ~ 750 degrees Celsius.
7. method according to claim 1, is characterized in that, carries out described roasting 1 ~ 4 hour under 200 ~ 700 degrees Celsius.
8. method according to claim 1, is characterized in that, comprises further and being separated with described leached mud by the described leach liquor containing rare earth element by filtration or siphon.
9. method according to claim 8, is characterized in that, under 20 ~ 90 degrees Celsius, carry out described separation.
10. method according to claim 1, is characterized in that, the ratio of the described nickel oxide ore through roasting and water is 1:3 ~ 10.
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| CN103361499A (en) * | 2013-07-23 | 2013-10-23 | 昆明贵金属研究所 | Method for recovering rare earth elements from spent automobile catalyst |
| CN103468980B (en) * | 2013-08-15 | 2016-04-13 | 中国恩菲工程技术有限公司 | A kind of red soil nickel ore extracts the method for scandium |
| CN103468979B (en) * | 2013-08-15 | 2016-02-24 | 中国恩菲工程技术有限公司 | The method of scandium is reclaimed from smelting laterite-nickel ores iron aluminium slag |
| CN103526015A (en) * | 2013-09-30 | 2014-01-22 | 中国恩菲工程技术有限公司 | Leaching method for nickel-containing limonite |
| WO2017100933A1 (en) * | 2015-12-16 | 2017-06-22 | Quest Rare Minerals Ltd. | Rare earth ore processing methods by acid mixing, sulphating and decomposing |
| CN109750168A (en) * | 2019-03-20 | 2019-05-14 | 中国恩菲工程技术有限公司 | The method and device of Selectively leaching scandium, nickel and cobalt element from laterite metallurgical slag |
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