CN113215388A - Method for converting niobium minerals in niobium rough concentrate into niobium-calcium ore and producing niobium concentrate - Google Patents
Method for converting niobium minerals in niobium rough concentrate into niobium-calcium ore and producing niobium concentrate Download PDFInfo
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- CN113215388A CN113215388A CN202110479866.5A CN202110479866A CN113215388A CN 113215388 A CN113215388 A CN 113215388A CN 202110479866 A CN202110479866 A CN 202110479866A CN 113215388 A CN113215388 A CN 113215388A
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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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B34/00—Obtaining refractory metals
- C22B34/20—Obtaining niobium, tantalum or vanadium
- C22B34/24—Obtaining niobium or tantalum
Abstract
The invention discloses a method for converting niobium minerals in niobium rough concentrate into niobium-calcium ore and producing niobium concentrate, which comprises the following steps: obtaining a mixture comprising a niobium rough concentrate, wherein the alkalinity of the niobium rough concentrate is regulated to be between about 1.4 and about 2.0; and (3) roasting the mixture in an inert protective gas at the temperature of about 1000-1200 ℃, so that the iron element in the niobium rough concentrate is reduced into metallic iron in a weak reducing atmosphere, and at least a part of niobium-containing minerals in the niobium rough concentrate are converted into the niobium-calcium ore, thereby obtaining the niobium-calcium ore-containing niobium rough concentrate. The method selectively and intensively regulates and controls various niobium minerals of the niobium rough concentrate into the niobium-calcium ore by controlling the alkalinity, the roasting atmosphere and the roasting temperature, and provides powerful conditions for obtaining the high-quality niobium concentrate containing the niobium-calcium ore through subsequent separation. The invention does not need high-temperature melting, has lower energy consumption and is beneficial to industrial application.
Description
Technical Field
The invention belongs to the technical field of metallurgy and mineral separation, and further relates to a method for converting niobium minerals in niobium rough concentrate into niobium-calcium ore and producing niobium concentrate.
Background
Niobium is an important strategic metal and is widely applied to the fields of steel, aerospace, electronic information and the like. The Baiyuneboite-niobium-rare earth multi-metal ore is used as the largest niobium resource base in China, but the conventional ore dressing process can only obtain Nb due to the characteristics of more kinds of niobium-containing minerals, complex components, high occupation ratio of low-niobium-containing minerals (ferrocolumbium and easy-dissolving stone), low content of low-iron high-niobium minerals (calcium niobate and pyrochlore), fine embedded granularity, mostly smaller than 20 mu m, close symbiosis with other minerals and the like2O5The grade of the coarse niobium concentrate is lower than 5 percent, and the high grade (Nb) similar to Brazil cannot be directly obtained2 O 550% -60%) niobium concentrate.
For example, chinese patent ZL96111328.6 discloses a process for producing medium-grade ferrocolumbium by smelting low-grade niobium rough concentrate in a "two-step" electric furnace, in which 1% -8% grade niobium concentrate, coke powder and organic binder are made into internally-carbon-added pellets, the pellets are first smelted in an electric furnace at 1350-1480 ℃ to separate niobium from iron, and then semi-steel and niobium-rich slag are obtained, and in the second step, the niobium-rich slag is aluminothermic reduced in an electric furnace at a temperature higher than 1550 ℃ to obtain medium-grade ferrocolumbium containing 30.8% niobium, which cannot meet the standard of the medium-grade ferrocolumbium in the state.
Chinese patent ZL201710206924.0 discloses a method for preparing titanium niobium iron ore concentrate powder, carbonaceous reducing agent and CaCO3Additive and binder as raw materials, through proportioning, mixing and pelletizingThe niobium-iron separation is realized through the procedures of direct reduction, melting separation and the like, the temperature of the melting separation procedure is 1350-1400 ℃, and the pellets are completely melted, so that the crystal growth of niobium minerals can be realized only through slow cooling crystallization to be beneficial to subsequent flotation, pig iron and niobium-rich slag with 5% -12% of grade are obtained after magnetic separation, and the niobium-rich slag is subjected to fine grinding flotation to obtain Nb2O5The content of the niobium-rich slag concentrate is 15 to 40 percent. But the slag after slow crystallization contains calcium, titanium, iron and niobium and is formed in the niobium/iron ore phase dispersed perovskite, and the theory of coexisting ore phase Nb2O5The content is low, and qualified niobium concentrate cannot be obtained. And the energy consumption of the pellet complete melting process is high, which is not beneficial to industrial application.
Disclosure of Invention
Technical problem
Based on the defects and shortcomings mentioned in the background art, the basic idea of the invention is as follows: and (3) converting a plurality of niobium minerals in the low-grade niobium rough concentrate into one niobium mineral in a centralized manner, or converting at least most of the niobium minerals into one niobium mineral, so that one niobium mineral is mainly used in the converted niobium rough concentrate, and the subsequent flotation and enrichment are facilitated, thereby obtaining the high-grade niobium concentrate.
Therefore, the technical problem to be solved by the invention is to provide a method for converting niobium ore in niobium rough concentrate into a certain niobium ore and producing niobium concentrate from the niobium ore, so as to obtain high-quality niobium concentrate through subsequent separation.
Technical scheme
Through a large amount of experimental observation and theoretical guidance, the niobium ore can be the niobium-calcium ore through the control of conditions, so that the technical problem can be solved. Therefore, the technical scheme is as follows:
a method of converting niobium minerals in a niobium rough concentrate to a biochloid, comprising:
obtaining a mixture comprising a niobium rough concentrate, wherein the alkalinity of the niobium rough concentrate is regulated to be between about 1.4 and about 2.0;
and (3) roasting the mixture in an inert protective gas at the temperature of about 1000-1200 ℃, so that the iron element in the niobium rough concentrate is reduced into metallic iron in a weak reducing atmosphere, and at least a part of niobium-containing minerals in the niobium rough concentrate are converted into the niobium-calcium ore, thereby obtaining the niobium-calcium ore-containing niobium rough concentrate.
In some embodiments, the niobium grade in the niobium rough concentrate is 5% or less, and the niobium-containing minerals in the niobium rough concentrate include one or more of niobite, niobite rutile, deliquescent stones, or wairauite.
In some embodiments, the weak reducing atmosphere is achieved by controlling the amount of carbonaceous reducing agent added to the mix or controlling the amount of reducing gas introduced into the firing atmosphere.
In some embodiments, the mass ratio of niobium rougher concentrate to carbonaceous reductant is 100 (about 5 to about 18).
In some embodiments, the mass ratio of niobium rougher concentrate to carbonaceous reductant is 100 (about 8 to about 12).
In some embodiments, the alkalinity is adjusted to be from about 1.5 to about 1.9.
In some embodiments, alkalinity is regulated by the addition of a calcareous agent and/or a siliceous agent.
In some embodiments, at a temperature of about 1050 c to about 1150 c.
In some embodiments, greater than 50% of the niobium-containing minerals in the niobium rough concentrate are converted to biocoal.
The method for producing the niobium concentrate from the niobium rough concentrate also comprises the step of producing the niobium concentrate from the niobium rough concentrate containing the niobium rough concentrate through sorting after converting niobium minerals in the niobium rough concentrate into niobium calcium ores.
Advantageous effects
The method has strong adaptability to niobium rough concentrates, is also suitable for alkaline or acidic niobium rough concentrates, selectively and intensively regulates and controls various niobium minerals of the niobium rough concentrates into niobium-calcium ores by controlling the alkalinity, the roasting atmosphere and the roasting temperature, and provides powerful conditions for obtaining high-quality niobium concentrates containing the niobium-calcium ores through subsequent separation. The invention does not need high-temperature melting, has lower energy consumption and is beneficial to industrial application.
The niobium concentrate containing niobium-calcium ore can reduce the content of iron components introduced into the niobium concentrate during smelting, and meanwhile, the calcium component is an indispensable slagging agent during smelting, so that the utilization rate of the niobium concentrate obtained by the process is high, and the preparation of high-quality niobium-iron is facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a process flow diagram of one embodiment of the present invention;
FIG. 2 is an electron micrograph of the niobium rough concentrate containing the colemanite of example 1;
FIG. 3 is an electron micrograph of the niobium rough concentrate containing the colemanite of example 2;
FIG. 4 is an electron micrograph of the niobium rough concentrate containing the colemanite of example 3.
Detailed Description
In order to facilitate understanding of the invention, the invention will be described more fully and in detail with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Definition of terms
The "%" as used herein means mass% unless otherwise specified.
As used herein, "about" preceding a number means that there is a ± 2% float on the number basis. About x, i.e., 0.98x to 1.02 x. About x%, i.e., 0.98 x% to 1.02 x%.
The "niobium-containing raw ore" as used herein refers to a niobium-containing ore in a natural environment, such as bayan obo ore polymetallic ore.
The term "niobium rough concentrate" as used herein refers to a rough concentrate obtained by pre-concentrating niobium-containing raw ore, which is used as a raw material in the present invention. The niobium-containing minerals in the niobium brown concentrate are referred to as "niobium-containing minerals" (or niobium minerals).
The term "niobium rough concentrate containing biochlomite" as used herein refers to a niobium rough concentrate obtained by converting at least a part of niobium minerals in the niobium rough concentrate into biochlomite by the method of the present invention.
The term "niobium concentrate" as used herein refers to a high-grade niobium ore product containing niobium calcium ore obtained by subjecting niobium rough concentrate or niobium rough concentrate containing niobium calcium ore obtained by the present invention to subsequent separation, such as flotation.
The term "ferrocolumbium" as used herein refers to a niobium product obtained by smelting a niobium concentrate.
FIG. 1 is a process flow diagram of one embodiment of the present invention. The method comprises the steps of firstly obtaining a mixture containing niobium rough concentrate, regulating and controlling the alkalinity of the niobium rough concentrate, then placing the mixture in inert protective gas, roasting at a certain temperature to reduce iron elements in the niobium rough concentrate into metallic iron in a weak reducing atmosphere, and converting at least a part of niobium-containing minerals in the niobium rough concentrate into niobium-calcium ore to obtain the niobium-calcium ore-containing niobium rough concentrate.
Coarse niobium concentrate
The niobium rough concentrate serving as the raw material of the invention is rough concentrate obtained by pre-selecting complex niobium-containing raw ore. The pre-separation can adopt the conventional ore dressing process, for example, carbonate and partial silicate of raw ore are removed through a table concentrator, pyrite and other sulfide ores are removed through reverse flotation, and finally, the weak magnetic niobium mineral is recovered through strong magnetic separation, so that the niobium rough concentrate is obtained.
In the invention, the niobium grade (Nb) in the niobium rough concentrate2O5Content) is generally less than 5%, for example from 1 to 5%, for example from 2 to 3.8%, based on the total mass of the niobium rough concentrate. The niobium-containing mineral may comprise one or more of niobite, niobite rutile, delite, wairauite, and the like, and in some embodiments, the niobium-containing minerals may be present. The total iron content is generally between 10 and 20 percent.
In some examples, the niobium rough concentrate from beneficiation of the bayan obo polymetallic ore as the raw material used mainly contains the niobium mineral species niobite (theoretical Nb)2O578.69% content, based on the mass of columbite iron ore), ferrocolumbium rutile (theoretical Nb)2O5Content 17.17%), easy-to-dissolve stone (theoretical Nb)2O523.40% -32.88% of niobium-calcium ore (theoretical Nb)2O582.60% content), pyrochlore (theoretical Nb)2O5Content 66%). It has the characteristics of high occupation ratio of low-niobium minerals (ferrocolumbium rutile and easy-dissolving stone), low content of low-iron high-niobium minerals (columbite-calcimine and pyrochlore), fine embedded granularity, mostly less than 20 mu m, close symbiosis with other minerals and the like.
The main reasons that the grade of the niobium rough concentrate produced by Baiyunebo is not high are as follows: the niobium minerals are various and have similar properties, wherein the niobium-iron rutile, the easy-dissolving stone and other low-grade niobium-containing minerals have high occupation ratio and the single high-niobium-grade minerals cannot be sorted; secondly, the iron content in the ore is high, the properties of the niobite are similar to those of other iron-containing minerals, the separation of the niobite is difficult, and the niobium rough concentrate still contains high iron. Therefore, it is necessary to anchor the "internal cause" of ore mineral composition, develop a technology for the iron component reduction to cooperate with the conversion of a plurality of niobium minerals into a single niobium mineral, and obtain qualified niobium concentrate through the "external cause" of ore dressing. The invention provides a method for converting various niobium minerals in niobium rough concentrate into niobium-calcium ore in a centralized manner through solid-phase reaction based on internal cause formed by ore minerals.
Mixture material
Besides the niobium-containing rough concentrate, the mixture optionally contains a reducing agent, and the alkalinity of the niobium rough concentrate needs to be regulated within a certain range.
(reducing agent)
The reducing agent is mainly used for reducing the iron element in the niobium rough concentrate into metallic iron, and any reducing agent capable of achieving the purpose is applicable. In some embodiments, the mixture comprises a niobium matte and a solid carbonaceous reductant. The reducing agent may be a gaseous reducing gas, and may be introduced during the calcination. Non-limiting examples of reducing agents include one or more of petroleum coke, coal fines, coke, heavy oil, natural gas, water gas, carbon monoxide, and hydrogen.
In some embodiments, the mass ratio of niobium roughing concentrate to carbonaceous reducing agent is 100 (about 5 to about 18), preferably 100 (about 8 to about 12), and more preferably 100: about 10. In this range, the iron element in the niobium rough concentrate can be sufficiently reduced to metallic iron.
(control of basicity)
The basicity in the present invention is defined as CaO/SiO2The mass ratio of (a). The basicity of the niobium rough concentrate is controlled to be in the range of about 1.4 to about 2.0, preferably about 1.5 to about 1.9, and more preferably about 1.7. The control of the alkalinity is important for the transformation into the wairaute, the alkalinity is too low or too high, the melting point of a reaction system is high, and the reaction is incomplete. The invention mainly controls a plurality of niobium minerals in the niobium rough concentrate into the niobium-calcium ore by controlling three factors of alkalinity, roasting atmosphere and roasting temperature.
In some embodiments, modulating the basicity of the niobium rough concentrate may be achieved by adding a reagent called a modifier (or modulating agent) to the niobium rough concentrate. The addition amount of the modifier is determined according to the original alkalinity of different niobium rough concentrates, and in some embodiments, the mass ratio of the niobium rough concentrate to the modifier is 100 (5-30), and is further 100 (5-10). Of course, if the basicity of the individual niobium rough concentrate is within the claimed range of the invention, no modifier is added.
In some embodiments, the modifier comprises a calcareous reagent and/or a siliceous reagent, both of which are not necessarily added, one of which may be added depending on the basicity of the niobium rough concentrate. Non-limiting examples of calcareous agents include limestone, fluorite, quicklime, dolomite, and the like. Non-limiting examples of siliceous agents include quartz sand, water glass, feldspar, fly ash, mine tailings, waste glass, and the like.
Step of mixing
The niobium rough concentrate, the reducing agent and the optional modifier are uniformly mixed, and any mixing equipment and mixing method can be adopted, for example, mixing by ball milling, a powder mill and the like.
In some embodiments, the binder is added to the uniformly mixed ingredients, which are then shaped to obtain a green mixture. In some embodiments, the binder may be added in an amount of 1% to 5% based on the total mass of the mix. The binder may be any solution of those known in the art, including, but not limited to, solutions of one or more of PVA, water glass, clay, and the like. The shaping can be carried out by conventional methods using existing equipment (including presses, dies, ball presses, etc.), for example, by briquetting or pelletizing. The pressure for molding is not particularly limited, and the molding can be carried out at a pressure of 2 to 20MPa or higher or lower. After the forming, the contact area of the niobium mineral and the reactant is increased, and the solid-phase reaction is promoted to be carried out.
Step of calcination
And (3) placing the mixture or the mixture blank in inert protective gas, roasting at a certain temperature, and obtaining the niobium rough concentrate containing the niobium-calcium ore by adopting a solid-phase reaction (different from melting smelting).
The firing temperature is desirably from about 1000 to about 1200 deg.C, preferably from about 1050 to about 1150 deg.C, and more preferably about 1100 deg.C. At too high a temperature, the proportion of niobium ore to calcium niobium ore may decrease, some niobium may be reduced to NbC, and at too low a temperature, niobium ore may be converted to other minerals. In some embodiments, the roasting holding time is greater than or equal to 30min, such as 30-120 min, preferably 50-100 min. Firing may be carried out in a known firing apparatus, such as a tube furnace or the like, as long as the firing apparatus has a cavity for accommodating the mix or the mixed compact and is capable of introducing a desired atmosphere into the cavity.
The roasting atmosphere is required to be a weak reducing atmosphere, so that the iron component in the system can be directly reduced into the metallic iron, but the niobium is not reduced, and if the reducing property of the reaction system is too strong, part of niobium minerals are reduced into niobium carbide and attached to the periphery of the metallic iron. In some embodiments, a weakly reducing atmosphere may be achieved by: inert protective gas (such as nitrogen and the like) is introduced into the system, and the existence of reducing agent is required for conversion, if the reducing agent adopts reducing gas such as natural gas, water gas, carbon monoxide, hydrogen and the like, the reducing gas needs to be introduced into the reaction system and mixed with the inert protective gas to form weak reducing atmosphere. If the reducing agent is carbonaceous reducing agents such as petroleum coke, coal powder, coke, heavy oil and the like, the carbonaceous reducing agents react with partial materials at the roasting temperature to generate reducing gases such as CO and the like, and the reducing gases are mixed in inert protective gas to form weak reducing atmosphere.
Here, the weakly reducing atmosphere, in some embodiments, if the reductant is a gaseous reductant, is controlled by controlling the gaseous reductant to inert gas volume ratio, e.g., controlling CO to CO2The volume ratio is (4-5): 5, preferably 1: 1. If the reducing agent is a carbonaceous reducing agent, it is sufficient to control the reducing agent in the proportions mentioned in the preceding paragraph. The reducing atmosphere must not be too strong, i.e. the amount of reducing agent added must not be too high.
Experiments prove that by adding a reducing agent into the niobium rough concentrate and regulating and controlling the alkalinity, roasting is carried out in a weak reducing atmosphere, so that iron-containing components such as hematite, limonite, pyrite, niobite/ferrocolumbium and the like in the rough concentrate are directly reduced into metallic iron, niobium minerals such as low-niobium-grade ferrocolumbium and resolvent can be converted into high-grade calcium niobate, niobium minerals such as weak-magnetic niobium iron ore and ferrocolumbium are converted into nonmagnetic niobium calcium, the magnetic difference between the niobium minerals and the metallic iron is enlarged, and further the subsequent separation of the niobium iron is facilitated; and powerful conditions are provided for the subsequent separation work of the niobium rough concentrate containing the niobium-calcium ore.
Niobium rough concentrate containing niobium-calcium ore
After the roasting treatment and cooling, most of the niobium-containing minerals in the niobium rough concentrate are converted into the niobium-calcium ore. The "majority" is, for example, more than 50%, or more than 70%, or more than 80%, or even more than 90%, based on the total mass of the niobium-containing minerals in the niobium rough concentrate. In some embodiments, the colemanite is intercalated with small amounts of sodium and iron, and in other embodiments, with small amounts of sodium, magnesium, and iron. In some other embodiments, a portion of the niobium is substituted with titanium.
The main component of the niobium-calcium ore can be represented as CaNb2O6. The distribution of the niobium element can be known through SEM surface scanning, and then the niobium can be known through the energy spectrum analysis of the niobium mineralThe mineral component is the niobium-calcium ore, and the proportion data of the niobium-calcium ore is obtained by calculating the proportion of the particle niobium mineral in the electron microscope photo.
In some embodiments, the perovskite niobium has a grain size of 30 to 70 μm, and in other embodiments, the grain size is 15 to 50 μm. In other embodiments, the large particles are converted into bird's nest shape with grain size of 30-70 μm, and the small particles are converted into dense particles with grain size of 15-25 μm.
Because most of the niobium-containing minerals are converted into single niobium-calcium ore, the method is beneficial to enrichment in subsequent separation (such as flotation) to obtain high-grade niobium concentrate. And (4) conventionally smelting the niobium concentrate obtained by flotation to obtain a high-grade ferrocolumbium product.
Examples
(example 1)
The niobium rough concentrate with the niobium grade of 2.24 percent obtained by pre-selecting the niobium-containing raw ore is taken as a main raw material, and the chemical composition is shown in table 1. . The niobium-containing mineral includes columbite, ferrocolumbium, easy-dissolving stone, and columbite-calcimine. The alkalinity was controlled to 1.7 in this example.
TABLE 1 raw materials chemical composition/wt%
Taking 20g of niobium rough concentrate, adding 2g of petroleum coke as a reducing agent, fully mixing by a powder making machine, adding 2mL of 5% PVA solution, molding the mixed material by a press machine and a mold to obtain a cylinder with the diameter of phi 30mm, drying in an oven for 8h, placing in a tubular furnace, introducing N2Roasting at 1000 ℃ for 3h under the condition of protective gas, cooling along with the furnace, and then finding by an electron microscope that 30% of niobium minerals are converted into internal loose granular niobium-calcium minerals doped with a small amount of sodium and iron, wherein the grain size of the niobium-calcium minerals is 40-70 mu m, and as shown by energy spectrum points 3 and 4, gangue minerals have a small amount of deformation, as shown in figure 2. In this example, the conversion rate was low due to the low calcination temperature.
(example 2)
The niobium rough concentrate with the niobium grade of 2.24 percent obtained by pre-selecting the niobium-containing raw ore is taken as a main raw material, and the chemical composition is shown in table 1. The niobium-containing mineral includes columbite, ferrocolumbium, easy-dissolving stone, and columbite-calcimine. The alkalinity was controlled to 1.7 in this example.
Taking 20g of niobium rough concentrate, adding 2g of petroleum coke, fully mixing the niobium rough concentrate with a powder making machine, adding 2mL of 5% PVA solution, molding the mixed material by utilizing a press machine and a mold to obtain a cylinder with the diameter phi of 30mm, drying the cylinder in an oven for 8 hours, placing the cylinder in a tubular furnace, and introducing N2Roasting at 1100 ℃ for 1h under the condition of protective gas, cooling along with the furnace, and then finding through an electron microscope that 80% of niobium ore is converted into niobium-calcium ore doped with a small amount of sodium, magnesium and iron, wherein large particles are converted into bird nest shape, the grain size is 30-70 mu m, and the energy spectrum point is shown as 7; part of the particles are transformed into dense particles with a grain size of 30 μm, as shown by the energy spectrum point 7, and part of the gangue minerals are severely deformed, as shown in fig. 3.
(example 3)
The niobium rough concentrate with the niobium grade of 2.24 percent obtained by pre-selecting the niobium-containing raw ore is taken as a main raw material, and the chemical composition is shown in table 1. The niobium-containing mineral includes columbite, ferrocolumbium, easy-dissolving stone, and columbite-calcimine. The alkalinity was controlled to 1.7 in this example.
Taking 20g of niobium rough concentrate, adding 3g of petroleum coke, fully mixing by a powder making machine, adding 2mL of 5% PVA solution, molding the mixed material by utilizing a press machine and a mold to obtain a cylinder with the diameter of phi 30mm, drying in an oven for 8h, placing the cylinder in a tubular furnace, introducing N2Roasting at 1200 ℃ for 1h under the condition of protective gas, cooling along with the furnace, and then finding by an electron microscope that 50% of niobium ore is converted into waimenite with part of niobium replaced by titanium, the grain size of the waimenite is 15-50 mu m, as shown by energy spectrum points 1 and 4, part of niobium is reduced into NbC and is attached to the periphery of C particles, as shown by energy spectrum point 7, gangue mineral is completely deformed, as shown in figure 4.
The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting the invention in any way. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (10)
1. A method for converting niobium minerals in a niobium rough concentrate to a biochlomite, comprising:
obtaining a mixture comprising a niobium rough concentrate, wherein the alkalinity of the niobium rough concentrate is regulated to be between about 1.4 and about 2.0;
and (3) roasting the mixture in an inert protective gas at the temperature of about 1000-1200 ℃, so that the iron element in the niobium rough concentrate is reduced into metallic iron in a weak reducing atmosphere, and at least a part of niobium-containing minerals in the niobium rough concentrate are converted into the niobium-calcium ore, thereby obtaining the niobium-calcium ore-containing niobium rough concentrate.
2. The method of claim 1, wherein the niobium grade of the niobium rough concentrate is no greater than 5% and the niobium-containing minerals of the niobium rough concentrate comprise one or more of niobite, niobite rutile, easy-dissolve ore, or niobite.
3. The method for converting niobium minerals in niobium roughing concentrates to niobium calcia as claimed in claim 1 or 2, characterized in that the weak reducing atmosphere is achieved by controlling the amount of carbonaceous reducing agent added to the mix or controlling the amount of reducing gas introduced into the roasting atmosphere.
4. The method of converting niobium minerals in niobium matte to biochloid as claimed in claim 3, wherein the mass ratio of niobium matte to carbonaceous reductant is 100 (about 5 to about 18).
5. The method of converting niobium minerals in niobium matte to biochlodine of claim 4, wherein the mass ratio of niobium matte to carbonaceous reductant is 100 (about 8 to about 12).
6. The method for converting niobium minerals in niobium concentrates to biocoal as claimed in claim 1 or 2 wherein the alkalinity is adjusted to about 1.5 to about 1.9.
7. The method for converting niobium minerals in niobium rough concentrate into biocalcogenite according to claim 1 or 2, characterized in that the alkalinity is regulated by adding calcareous and/or siliceous agents.
8. The method of converting niobium minerals in niobium concentrates to biocoal as claimed in claim 1 or 2 wherein firing is at a temperature of about 1050 ℃ to about 1150 ℃.
9. The method of converting niobium minerals in niobium concentrates to biocoal as claimed in claim 1 or 2 wherein greater than 50% of the niobium containing minerals in the niobium concentrates are converted to biocoal.
10. A method for producing niobium concentrate from niobium rough concentrate, which is characterized in that the method according to any one of claims 1 to 9 is adopted to convert niobium minerals in the niobium rough concentrate into niobium calcium ore, and the method further comprises the step of producing the niobium concentrate from niobium calcium ore-containing niobium rough concentrate through separation.
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| CN115138471A (en) * | 2022-05-16 | 2022-10-04 | 长沙矿冶研究院有限责任公司 | Method for comprehensively recovering niobium from rare multi-metal ore |
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| CN115138471A (en) * | 2022-05-16 | 2022-10-04 | 长沙矿冶研究院有限责任公司 | Method for comprehensively recovering niobium from rare multi-metal ore |
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