Beneficiation method of rare earth ore and application of TH908

Abstract

The invention discloses a beneficiation method of rare earth ore and application of TH908. The beneficiation method comprises the following steps that (1) the rare earth ore is subjected to roughing flotation in the presence of a TH908 ceramic dispersing agent, and roughing concentrate and tailings are obtained; (2) the roughing concentrate is subjected to primary concentration flotation in the presence of a TH908 ceramic dispersing agent, and primary concentration concentrate and primary concentration tailings are obtained; (3) grinding the first-time concentrated concentrate to obtain the first-time concentrated concentrate and grinding the first-time concentrated concentrate; wherein in the re-grinding process of the concentrate subjected to primary concentration, the concentrate with the fineness being 38 microns or below accounts for 80 wt% or above; and (4) re-grinding the primary concentrated concentrate, and carrying out secondary concentrated flotation in the presence of a TH908 ceramic dispersant to obtain rare earth concentrate and re-concentrated tailings. According to the method, the content of impurities such as Ca and P in the rare earth ore concentrate can be reduced.

Description

Technical Field

[0001] The present invention relates to a rare earth ore beneficiation method and also relates to the use of TH908. Background Art

[0002] Flotation utilizes differences in wettability between minerals to separate useful minerals from gangue minerals. The addition of flotation agents such as inhibitors, dispersants, and collectors during the flotation process can amplify differences in hydrophilicity and hydrophobicity between minerals and improve flotation process performance. In rare earth flotation, gangue minerals such as fluorite, dolomite, and apatite are easy to float but difficult to separate. In practice, water glass is often used to suppress these gangue minerals, but the results are often unsatisfactory.

[0003] CN116618184A discloses a method for recovering iron ore tailings, comprising: (1) slurrying the iron ore tailings to obtain a pulp; sequentially adding water glass, sodium oleate and related substances to the pulp, and flotation separation to obtain a mixed flotation foam product and mixed flotation sand; (2) filtering the mixed flotation foam product to obtain a solid; drying the solid and roasting it at 400-650°C to obtain a roasted product; grinding the roasted product to obtain a ground product; (3) slurrying the ground product to obtain a ground product pulp; sequentially adding sodium sulfide, water glass, sodium alginate, hydroxamic acid and pine oil to the ground product pulp, and flotation separation to obtain a rare earth concentrate and rare earth tailings. The rare earth concentrate obtained by this method contains a large amount of impurity elements.

[0004] CN116393243A discloses a method for separating carbonate rare earth minerals and monazite, comprising: (1) grinding a mixed ore containing rare earth elements to obtain a grinding product; (2) sequentially adding a mixture of octanoylhydroxamic acid and alkali metal oleate, a mixture of dextrin and alum, a mixture of water glass and ethylenediaminetetraacetic acid, and pine oil to the slurry of the grinding product, and aerating flotation to obtain a roughing concentrate and a roughing tailing; (3) subjecting the roughing concentrate to a tertiary concentration to obtain a carbonate rare earth concentrate and a tertiary concentration tailing; (4) subjecting the roughing tailing to a secondary scavenging concentration to a secondary scavenging concentration and a secondary scavenging tailing; and (5) subjecting the secondary scavenging tailing to a magnetic separation using a magnetic separator to obtain a monazite concentrate and a final tailing. This method is suitable for separating carbonate rare earth minerals and monazite. Summary of the Invention

[0005] One object of the present invention is to provide a rare earth ore beneficiation method that can reduce the content of impurities such as calcium and phosphorus in rare earth concentrate. Furthermore, the beneficiation method can increase the REO content in the rare earth concentrate and achieve a high REO recovery rate. Another object of the present invention is to provide a use of TH908 ceramic dispersant.

[0006] The purpose of the present invention is achieved through the following technical solutions.

[0007] In one aspect, the present invention provides a method for beneficiating rare earth ores, comprising the following steps:

[0008] (1) The rare earth ore is subjected to roughing flotation in the presence of TH908 ceramic dispersant to obtain roughing concentrate and tailings;

[0009] (2) The rougher concentrate is subjected to a primary flotation in the presence of TH908 ceramic dispersant to obtain a primary concentrated concentrate and a primary concentrated tailings;

[0010] (3) grinding the primary concentrate to obtain the primary concentrate and regrinding the primary concentrate; wherein the regrinded primary concentrate has a fineness of less than 38 μm accounting for more than 80 wt%;

[0011] (4) The primary concentrated ore is re-ground and then subjected to secondary concentration flotation in the presence of TH908 ceramic dispersant to obtain rare earth concentrate and secondary concentrated tailings.

[0012] According to the mineral processing method of the present invention, preferably, the rare earth ore contains at least one of bastnaesite and monazite.

[0013] According to the mineral processing method of the present invention, preferably, the TH908 ceramic dispersant is used in the form of a TH908 ceramic dispersant aqueous solution, and the concentration of the TH908 ceramic dispersant aqueous solution is 0.5 to 5 wt%;

[0014] In step (1), the amount of TH908 ceramic dispersant aqueous solution used is 20 to 500 g per ton of rare earth ore;

[0015] In step (2), the amount of TH908 ceramic dispersant aqueous solution used is 10 to 300 g per ton of rare earth ore;

[0016] In step (4), the amount of TH908 ceramic dispersant aqueous solution used is 5 to 200 g per ton of rare earth ore.

[0017] According to the mineral processing method of the present invention, preferably, the roughing flotation is carried out in the presence of water glass, a saponified collector and a frother; the primary cleaning flotation is carried out in the presence of water glass, a saponified collector and a frother; and the secondary cleaning flotation is carried out in the presence of water glass, a saponified collector and a frother.

[0018] The saponified collector is prepared from raw materials including a collector, an alkaline substance and water; the collector is selected from one or more of salicylic acid, octyl hydroxamic acid, benzohydroxamic acid, naphthohydroxamic acid, P8, and 506E, and the alkaline substance is selected from one or more of sodium hydroxide and ammonia water;

[0019] The foaming agent is selected from one or more of No. 2 oil and methyl isobutyl carbinol.

[0020] According to the mineral processing method of the present invention, preferably, in the raw materials for preparing the saponified collector, the mass ratio of the collector to the alkaline substance is 1:(0.05-0.5), and the mass of the collector is 0.5-5wt% of the total mass of the collector, the alkaline substance and water.

[0021] According to the mineral processing method of the present invention, preferably, in step (1), per ton of rare earth ore, the amount of water glass used is 500-2500 g, the amount of the saponified collector used is 400-1600 g, and the amount of the foaming agent used is 100-200 g;

[0022] In step (2), per ton of rare earth ore, the amount of water glass is 100-500 g, the amount of the saponified collector is 100-400 g, and the amount of the foaming agent is 20-100 g;

[0023] In step (4), per ton of rare earth ore, the amount of water glass is 10-300 g, the amount of the saponified collector is 50-300 g, and the amount of the foaming agent is 5-50 g.

[0024] According to the mineral processing method of the present invention, preferably, the secondary flotation is performed at N levels, where N is an integer greater than or equal to 2;

[0025] Among them, the first-level secondary flotation includes the following steps:

[0026] The first-stage concentrated ore is re-ground and then subjected to first-stage re-concentration flotation in the presence of TH908 ceramic dispersant to obtain first-stage re-concentrated concentrate and first-stage re-concentrated tailings;

[0027] Among them, the second-stage re-concentration flotation to the N-stage re-concentration flotation respectively include the following steps:

[0028] The m-1 grade re-concentrated concentrate is subjected to m grade re-concentration flotation in the presence of TH908 ceramic dispersant to obtain m grade re-concentrated concentrate and m grade re-concentrated tailings; m is an integer greater than or equal to 2 and less than or equal to N;

[0029] N-level concentrated ore is rare earth concentrate;

[0030] The first-level re-concentrated tailings to the N-level re-concentrated tailings are combined to obtain re-concentrated tailings.

[0031] The mineral processing method according to the present invention preferably further comprises the following steps:

[0032] The tailings are returned to step (1) for further selection.

[0033] The tailings are then concentrated again and returned to step (2) for further selection.

[0034] In another aspect, the present invention provides a use of a TH908 ceramic dispersant as a depressant in rare earth ore flotation.

[0035] In another aspect, the present invention provides a use of TH908 ceramic dispersant in reducing the Ca and / or P content in rare earth concentrate.

[0036] The ore dressing method of the present invention can reduce the content of impurities such as Ca and P in rare earth concentrate. Furthermore, the ore dressing method can increase the content of REO in rare earth concentrate and has a high REO recovery rate. DETAILED DESCRIPTION

[0037] The present invention will be further described below with reference to specific embodiments, but the protection scope of the present invention is not limited thereto.

[0038] <Rare Earth Ore Beneficiation Method>

[0039] The rare earth ore beneficiation method of the present invention comprises the following steps: (1) a roughing step; (2) a primary beneficiation step; (3) a grinding step; and (4) a secondary beneficiation step. Each step is described in detail below.

[0040] Rough selection steps

[0041] The present invention performs roughing flotation on rare earth ore in the presence of TH908 ceramic dispersant to obtain roughing concentrate and tailings. Preferably, the rare earth ore is subjected to roughing flotation in the presence of TH908 ceramic dispersant, water glass, a saponified collector and a frother.

[0042] The rare earth ore may be iron ore tailings. The rare earth ore contains at least one of bastnaesite and monazite. In certain embodiments, the rare earth ore further contains at least one of magnetite, hematite, amphibole, nepheline, fluorite, apatite, barite, and dolomite.

[0043] The content of bastnaesite may be 5 to 25 wt %, preferably 10 to 22 wt %, and more preferably 15 to 20 wt %.

[0044] The content of monazite may be 3 to 20 wt %, preferably 5 to 15 wt %, and more preferably 7 to 12 wt %.

[0045] The total content of magnetite, hematite, amphibole, nepheline, fluorite, apatite, barite and dolomite may be 40 to 75 wt %, preferably 50 to 70 wt %, and more preferably 55 to 65 wt %.

[0046] The REO content in the rare earth ore may be 4 to 12 wt %, preferably 6 to 10 wt %, and more preferably 7 to 9 wt %.

[0047] The CaO content in the rare earth ore may be 15 to 30 wt %, preferably 17 to 25 wt %, and more preferably 20 to 23 wt %.

[0048] In rare earth ores, the P2O5 content may be 1 to 6 wt%; preferably 2 to 5 wt%; more preferably 3 to 4 wt%.

[0049] The TFe content in the rare earth ore may be 5 to 18 wt%, preferably 7 to 15 wt%, and more preferably 10 to 13 wt%. The TFe content represents the total iron content.

[0050] In the rare earth ore, the F content may be 5 to 18 wt %, preferably 7 to 15 wt %, and more preferably 9 to 12 wt %.

[0051] The main component of TH908 ceramic dispersant is the salt of anionic polymer. It is mainly used as an additive in magnetic materials, electronic ceramics, papermaking industry, alumina ceramics, daily ceramics and other industries. It can be purchased from Shandong Taihe Technology Co., Ltd.

[0052] TH908 ceramic dispersant can be used in the form of a TH908 ceramic dispersant aqueous solution. The concentration of the TH908 ceramic dispersant aqueous solution can be 0.5 to 5 wt%, preferably 1 to 4 wt%, and more preferably 2 to 3 wt%.

[0053] The dosage of the TH908 ceramic dispersant aqueous solution can be 20 to 500 g per ton of rare earth ore, preferably 70 to 300 g, and more preferably 120 to 180 g.

[0054] The concentration of water glass may be 1 to 7 wt %, preferably 2 to 6 wt %, and more preferably 3 to 5 wt %.

[0055] Calculated per ton of rare earth ore, the amount of water glass used is 500-2500 g; preferably 1000-2000 g; more preferably 1300-1700 g.

[0056] The saponified collector is prepared from raw materials including a collector, an alkaline substance and water.

[0057] The collector is selected from one or more of salicylic acid, octyl hydroxamic acid, benzoic acid, naphthohydroxamic acid, P8, and 506E. Preferably, the collector is selected from one or more of octyl hydroxamic acid and P8. More preferably, the collector is P8. Collector P8 can be purchased from Inner Mongolia Baotou Steel Rare Earth Linfeng Technology Co., Ltd. Collector 506E can be purchased from Baotou Mengrong Fine Materials Co., Ltd.

[0058] The alkaline substance is selected from one or more of sodium hydroxide and ammonia water. Preferably, the alkaline substance is sodium hydroxide.

[0059] The mass ratio of the collector to the alkaline substance may be 1:(0.05-0.5); preferably 1:(0.1-0.4); more preferably 1:(0.15-0.3).

[0060] The mass of the collector is 0.5-5 wt% of the total mass of the collector, the alkaline substance and water; preferably 1-4 wt%; more preferably 2-3 wt%.

[0061] Calculated per ton of rare earth ore, the amount of the saponified collector used is 400-1600 g, preferably 600-1200 g, and more preferably 700-1000 g.

[0062] The foaming agent can be selected from one or more of No. 2 oil and methyl isobutyl carbinol. Preferably, the foaming agent is No. 2 oil. The main component of No. 2 oil is α-terpene alcohol.

[0063] Calculated per ton of rare earth ore, the amount of the foaming agent used is 100-200 g; preferably 120-190 g; more preferably 150-180 g.

[0064] Rough flotation can be carried out at 50-90°C; preferably, rough flotation is carried out at 60-85°C; more preferably, rough flotation is carried out at 70-80°C.

[0065] Rare earth ore can be formed into a slurry and then subjected to rougher flotation in the presence of TH908 ceramic dispersant, water glass, a saponified collector, and a frother. Specifically, after heating the rare earth ore slurry to the rougher flotation temperature, TH908 ceramic dispersant, water glass, a saponified collector, and a frother are sequentially added to the slurry. After the addition of each material, stir for 2 to 10 minutes, preferably 4 to 7 minutes, before adding the next material. After the addition of the frother, stir for 1 to 5 minutes, preferably 2 to 4 minutes, before performing rougher flotation.

[0066] The concentration of the rare earth ore slurry may be 50-65 wt %, preferably 55-60 wt %, and more preferably 57-58 wt %.

[0067] A selection of steps

[0068] In the present invention, the rougher concentrate is subjected to primary flotation in the presence of TH908 ceramic dispersant to produce a primary concentrated concentrate and primary concentrated tailings. Preferably, the rare earth ore is subjected to primary flotation in the presence of TH908 ceramic dispersant, water glass, a saponified collector, and a frother. The TH908 ceramic dispersant, water glass, saponified collector, and frother are as described above in the rougher step and are not further described here.

[0069] The dosage of the TH908 ceramic dispersant aqueous solution can be 10 to 300 g per ton of rare earth ore, preferably 70 to 200 g, and more preferably 100 to 150 g.

[0070] The amount of water glass used per ton of rare earth ore can be 100-500 g, preferably 120-300 g, and more preferably 125-150 g.

[0071] The amount of the saponified collector used per ton of rare earth ore can be 100 to 400 g, preferably 150 to 300 g, and more preferably 170 to 200 g.

[0072] The amount of the foaming agent used per ton of rare earth ore can be 20 to 100 g, preferably 30 to 80 g, and more preferably 50 to 60 g.

[0073] The primary flotation temperature may be 50-90°C, preferably 60-80°C, and more preferably 70-80°C.

[0074] The rougher concentrate can be formed into a rougher concentrate slurry, and then subjected to primary flotation in the presence of TH908 ceramic dispersant, water glass, a saponified collector, and a frother. Specifically, the rougher concentrate slurry can be heated to the primary flotation temperature, and then the TH908 ceramic dispersant, water glass, saponified collector, and frother can be added to the rougher concentrate slurry in that order. After the addition of the first material, stir for 2 to 10 minutes, preferably 4 to 7 minutes, before adding the next material. After the addition of the frother, stir for 1 to 5 minutes, preferably 2 to 4 minutes, before performing the primary flotation.

[0075] The concentration of the rougher concentrate slurry may be 35 to 60 wt %, preferably 40 to 55 wt %, and more preferably 45 to 50 wt %.

[0076] The tailings from the first concentration can be returned to the roughing flotation step for another roughing flotation.

[0077] Grinding steps

[0078] The present invention grinds the primary concentrated ore to obtain the primary concentrated ore and then grinds it again.

[0079] The fineness of the primary concentrating regrinded ore is below 38 μm, accounting for more than 80 wt %; preferably, accounting for more than 85 wt %; more preferably, accounting for 90-95 wt %.

[0080] A ball mill can be used for grinding. The medium can be selected from one or more of agate balls, corundum balls, and zirconia balls. The filling rate can be 35-45 vol%, preferably 38-42 vol%.

[0081] Steps to reselect

[0082] In the present invention, the primary concentrate is regrinded and subjected to secondary flotation in the presence of TH908 ceramic dispersant to produce a rare earth concentrate and secondary flotation tailings. Preferably, the primary concentrate is regrinded and subjected to secondary flotation in the presence of TH908 ceramic dispersant, water glass, a saponified collector, and a frother. The TH908 ceramic dispersant, water glass, a saponified collector, and a frother are as described above in the roughing step and are not further described here.

[0083] The dosage of the TH908 ceramic dispersant aqueous solution can be 5 to 200 g per ton of rare earth ore; preferably 30 to 150 g; more preferably 60 to 100 g.

[0084] The amount of water glass used per ton of rare earth ore can be 10 to 300 g, preferably 30 to 200 g, and more preferably 50 to 100 g.

[0085] The amount of the saponified collector used per ton of rare earth ore can be 50 to 300 g, preferably 80 to 200 g, and more preferably 100 to 150 g.

[0086] The amount of the foaming agent used per ton of rare earth ore can be 5 to 50 g, preferably 10 to 40 g, and more preferably 15 to 25 g.

[0087] The secondary flotation temperature may be 50-90°C, preferably 60-80°C, and more preferably 70-80°C.

[0088] The primary concentrate can be reground to form a primary concentrate reground slurry, which can then be subjected to secondary flotation in the presence of TH908 ceramic dispersant, water glass, a saponified collector, and a frother. Specifically, the primary concentrate reground slurry can be heated to the secondary flotation temperature, and then TH908 ceramic dispersant, water glass, a saponified collector, and a frother can be added to the primary concentrate reground slurry in sequence. After the addition of the first material, stir for 2 to 10 minutes, preferably 4 to 7 minutes, before adding the next material. After the addition of the frother, stir for 1 to 5 minutes, preferably 2 to 4 minutes, before conducting secondary flotation.

[0089] The concentration of the ore pulp of the primary concentrate re-grinding ore can be 25-55wt%; preferably 30-50wt%; more preferably 40-45wt%.

[0090] The secondary concentrated tailings can be returned to the primary concentration flotation step for another primary concentration flotation.

[0091] In certain embodiments, the secondary flotation is performed at N levels, where N is an integer greater than or equal to 2. Preferably, N is an integer greater than or equal to 2 and less than or equal to 5; more preferably, N is an integer greater than or equal to 2 and less than or equal to 3.

[0092] Among them, the first-level re-concentration includes the following steps: re-grinding the first-level concentrated concentrate and conducting first-level re-concentration flotation in the presence of TH908 ceramic dispersant, water glass, saponified collector and frother to obtain first-level re-concentrated concentrate and first-level re-concentrated tailings.

[0093] The primary concentrate can be regrinded to form a primary concentrate regrinded slurry, and then a secondary concentration flotation is carried out in the presence of TH908 ceramic dispersant, water glass, saponified collector and frother.

[0094] The concentration of the ore pulp of the primary concentrate re-grinding ore can be 30-55wt%; preferably 35-50wt%; more preferably 40-45wt%.

[0095] The dosage of the TH908 ceramic dispersant aqueous solution can be 30 to 150 g per ton of rare earth ore, preferably 40 to 120 g, and more preferably 60 to 80 g.

[0096] Among them, the second-stage re-concentration flotation to the N-stage re-concentration flotation respectively include the following steps:

[0097] The m-1 grade re-concentrated concentrate is subjected to m-grade re-concentration flotation in the presence of TH908 ceramic dispersant, water glass, saponified collector and frother to obtain m-grade re-concentrated concentrate and m-grade re-concentrated tailings; wherein m is an integer greater than or equal to 2 and less than or equal to N;

[0098] N-level concentrated ore is rare earth concentrate;

[0099] The first-level re-concentrated tailings to the N-level re-concentrated tailings are combined to obtain re-concentrated tailings.

[0100] The m-1 grade re-concentrated concentrate can be formed into an m-1 grade re-concentrated concentrate slurry, and then the m-1 grade re-concentrated flotation is carried out in the presence of TH908 ceramic dispersant, water glass, saponified collector and frother.

[0101] The concentration of the re-concentrated concentrate pulp of the m-1 level can be 25-40 wt%; preferably 25-35 wt%; more preferably 30-32 wt%.

[0102] Based on each ton of rare earth ore, the dosage of the TH908 ceramic dispersant aqueous solution can be 10-100 g; preferably 20-60 g; more preferably 30-40 g.

[0103] <The use of TH908>

[0104] The present invention unexpectedly discovers that the TH908 ceramic dispersant can adsorb on the surface of gangue minerals such as fluorite and apatite, hindering the adsorption of subsequent hydroxamic acid collectors, making the hydrophilicity of gangue minerals such as fluorite and apatite greater than that of rare earth ores such as bastnaesite and monazite in flotation. Therefore, the present invention provides a use of the TH908 ceramic dispersant as an inhibitor in the flotation of rare earth ores.

[0105] The rare earth ore can be an iron ore dressing tailing. The rare earth ore contains at least one of bastnaesite and monazite. In certain embodiments, the rare earth ore also contains at least one of magnetite, hematite, amphibole, aegirine, fluorite, apatite, barite, and dolomite.

[0106] The content of bastnaesite can be 5-25 wt%; preferably 10-22 wt%; more preferably 15-20 wt%.

[0107] The content of monazite can be 3-20 wt%; preferably 5-15 wt%; more preferably 7-12 wt%.

[0108] The total content of magnetite, hematite, amphibole, aegirine, fluorite, apatite, barite, and dolomite can be 40-75 wt%; preferably 50-70 wt%; more preferably 55-65 wt%.

[0109] In the rare earth ore, the REO content can be 4-12 wt%; preferably 6-10 wt%; more preferably 7-9 wt%.

[0110] In the rare earth ore, the CaO content can be 15-30 wt%; preferably 17-25 wt%; more preferably 20-23 wt%.

[0111] In the rare earth ore, the P2O5 content can be 1-6 wt%; preferably 2-5 wt%; more preferably 3-4 wt%.

[0112] In the rare earth ore, the TFe content can be 5-18 wt%; preferably 7-15 wt%; more preferably 10-13 wt%.

[0113] In the rare earth ore, the F content may be 5 to 18 wt %, preferably 7 to 15 wt %, and more preferably 9 to 12 wt %.

[0114] The main component of TH908 ceramic dispersant is the salt of anionic polymer. It is mainly used as an additive in magnetic materials, electronic ceramics, papermaking industry, alumina ceramics, daily ceramics and other industries. It can be purchased from Shandong Taihe Technology Co., Ltd.

[0115] TH908 ceramic dispersant can be used in the form of a TH908 ceramic dispersant aqueous solution. The concentration of the TH908 ceramic dispersant aqueous solution can be 0.5 to 5 wt%, preferably 1 to 4 wt%, and more preferably 2 to 3 wt%.

[0116] TH908 ceramic dispersant can effectively suppress gangue minerals associated with bastnaesite and monazite during flotation, effectively reducing the content of impurities such as calcium and phosphorus in rare earth concentrates. Therefore, the present invention provides a use of TH908 ceramic dispersant to reduce the content of calcium and / or phosphorus in rare earth concentrates.

[0117] Specifically, the steps include:

[0118] (1) flotation roughing of rare earth ore in the presence of TH908 ceramic dispersant to obtain roughing concentrate and tailings;

[0119] (2) The rougher concentrate is subjected to a primary flotation in the presence of TH908 ceramic dispersant to obtain a primary concentrated concentrate and a primary concentrated tailings;

[0120] (3) grinding the primary concentrate to obtain the primary concentrate regrinding; the primary concentrate regrinding ore has a fineness of less than 38 μm accounting for more than 80 wt%;

[0121] (4) The primary concentrated ore is re-ground and then subjected to secondary concentration flotation in the presence of TH908 ceramic dispersant to obtain rare earth concentrate and secondary concentrated tailings.

[0122] The above steps are specifically as described above and will not be repeated here.

[0123] Here is the test method:

[0124] REO content: tested according to the method specified in GB / T 18114.1-2010.

[0125] Ca content: tested according to the method specified in GB / T 18114.3-2010.

[0126] P content: tested according to the method specified in GB / T 18114.9-2010.

[0127] REO recovery rate: calculated according to the formula [(REO content in rare earth concentrate × rare earth concentrate yield) / REO content in rare earth ore] × 100%.

[0128] Here are the raw materials:

[0129] TH908 ceramic dispersant was purchased from Shandong Taihe Technology Co., Ltd.

[0130] The rare earth ore is the Bayan Obo mine, and the iron ore tailings are obtained by magnetic separation.

[0131] Among the rare earth ores, the content of fluorocarbon cerium ore is 17.53wt%, the content of monazite is 9.94wt%, the content of magnetite / hematite is 19.45wt%, the content of amphibole is 4.19wt%, the content of nepheline is 7.95wt%, the content of fluorite is 10.98wt%, the content of apatite is 3.47wt%, the content of barite is 9.78wt%, and the content of dolomite is 3.36wt%.

[0132] In the rare earth ore, the REO content is 8.57wt%, the CaO content is 22.51wt%, the P2O5 content is 3.45wt%, the TFe content is 11.68wt%, and the F content is 10.26wt%.

[0133] The concentration of water glass was 4 wt%.

[0134] The saponified collector was prepared from a mixture of collector, NaOH, and water. The mass ratio of collector to NaOH was 1:0.15. The mass of the collector was 2% of the total mass of the collector, NaOH, and water. The collector was P8, produced by Inner Mongolia Baotou Steel Rare Earth Linfeng Technology Co., Ltd.

[0135] No. 2 oil was purchased from Baotou Pengde Trading Co., Ltd.

[0136] Example 1

[0137] (1) The rare earth ore is slurried to form a rare earth ore slurry with a concentration of 58wt%. After the rare earth ore slurry is heated to 80°C, a 2wt% TH908 ceramic dispersant aqueous solution is added to the rare earth ore slurry. After the TH908 ceramic dispersant aqueous solution is added, stir for 5 minutes, and then add water glass. After the water glass is added, stir for 5 minutes, and then add the saponified collector. After the saponified collector is added, stir for 5 minutes, and then add No. 2 oil. After the No. 2 oil is added, stir for 3 minutes, and then perform roughing flotation to obtain roughing concentrate and tailings. Based on each ton of rare earth ore, the amount of TH908 ceramic dispersant aqueous solution is 150g, the amount of water glass is 1500g, the amount of saponified collector is 800g, and the amount of No. 2 oil is 180g.

[0138] (2) The roughing concentrate is slurried to form a roughing concentrate slurry with a concentration of 45wt%. After the roughing concentrate slurry is heated to 80°C, a 2wt% TH908 ceramic dispersant aqueous solution is added to the roughing concentrate slurry. After the TH908 ceramic dispersant aqueous solution is added, stir for 5 minutes, and then add water glass. After the water glass is added, stir for 5 minutes, and then add the saponified collector. After the saponified collector is added, stir for 5 minutes, and then add No. 2 oil. After the No. 2 oil is added, stir for 3 minutes, and then perform a primary flotation to obtain a primary concentrated concentrate and a primary concentrated tailings. The primary concentrated tailings are returned to step (1) for further separation. Based on each ton of rare earth ore, the amount of TH908 ceramic dispersant aqueous solution is 120g, the amount of water glass is 125g, the amount of saponified collector is 170g, and the amount of No. 2 oil is 54g.

[0139] (3) The primary concentrate was ground using a ceramic ball mill to obtain a primary concentrate with a fineness of -38 μm and a proportion of 92 wt%. The medium used was zirconia balls with a filling rate of 40 vol%.

[0140] (4) The primary concentrate is reground and slurried to form a primary concentrate reground slurry with a concentration of 40wt%. After the primary concentrate reground slurry is heated to 80°C, a 2wt% TH908 ceramic dispersant aqueous solution is added to the primary concentrate reground slurry. After the TH908 ceramic dispersant aqueous solution is added, stir for 5 minutes, and then add water glass. After the water glass is added, stir for 5 minutes, and then add the saponified collector. After the saponified collector is added, stir for 5 minutes, and then add No. 2 oil. After the No. 2 oil is added, stir for 3 minutes, and then perform a first-level re-concentration flotation to obtain a first-level re-concentrated concentrate and a first-level re-concentrated tailings. Based on each ton of rare earth ore, the amount of TH908 ceramic dispersant aqueous solution is 60g, the amount of water glass is 63g, the amount of saponified collector is 113g, and the amount of No. 2 oil is 18g.

[0141] The primary secondary concentrate is slurried to form a 32wt% primary secondary concentrate slurry. After heating the primary secondary concentrate slurry to 80°C, a 2wt% aqueous solution of TH908 ceramic dispersant is added. After the TH908 ceramic dispersant is added, stir for 5 minutes, then add water glass. After the water glass is added, stir for 5 minutes, then add the saponified collector. After the saponified collector is added, stir for 5 minutes, then add No. 2 oil. After the No. 2 oil is added, stir for 3 minutes, then perform secondary secondary flotation to produce rare earth concentrate and secondary secondary tailings. Per ton of rare earth ore, the dosage of TH908 ceramic dispersant is 30g, the dosage of water glass is 63g, the dosage of saponified collector is 113g, and the dosage of No. 2 oil is 18g.

[0142] After the first-stage re-selected tailings and the second-stage re-selected tailings are combined, return to step (2) for re-selection.

[0143] The REO content, Ca content and P content in the rare earth concentrate are shown in Table 1. The REO recovery rate is shown in Table 1.

[0144] Comparative Example 1

[0145] The same procedures as in Example 1 were followed except that the TH908 ceramic dispersant aqueous solution was not used in steps (1), (2) and (4) and step (3) was not performed.

[0146] The REO content, Ca content and P content in the rare earth concentrate are shown in Table 1. The REO recovery rate is shown in Table 1.

[0147] Table 1

[0148]

[0149]

[0150] The present invention is not limited to the above-mentioned embodiments. Any modification, improvement, or substitution that can be conceived by those skilled in the art without departing from the essential content of the present invention shall fall within the scope of the present invention.

Claims

1. A rare earth ore beneficiation method, characterized in that: The steps include: (1) The rare earth ore is subjected to roughing flotation in the presence of TH908 ceramic dispersant to obtain roughing concentrate and tailings; (2) The rougher concentrate is subjected to a primary flotation in the presence of TH908 ceramic dispersant to obtain a primary concentrated concentrate and a primary concentrated tailings; (3) grinding the primary concentrate to obtain the primary concentrate and regrinding the primary concentrate; wherein the regrinded primary concentrate has a fineness of less than 38 μm accounting for more than 80 wt%; (4) The primary concentrated ore is re-ground and then subjected to secondary concentration flotation in the presence of TH908 ceramic dispersant to obtain rare earth concentrate and secondary concentrated tailings.

2. The mineral processing method according to claim 1, characterized in that: The rare earth ore contains at least one of bastnaesite and monazite.

3. The mineral processing method according to claim 1, characterized in that: The TH908 ceramic dispersant is used in the form of a TH908 ceramic dispersant aqueous solution, and the concentration of the TH908 ceramic dispersant aqueous solution is 0.5 to 5 wt%; In step (1), the amount of TH908 ceramic dispersant aqueous solution used is 20 to 500 g per ton of rare earth ore; In step (2), the amount of TH908 ceramic dispersant aqueous solution used is 10 to 300 g per ton of rare earth ore; In step (4), the amount of TH908 ceramic dispersant aqueous solution used is 5 to 200 g per ton of rare earth ore.

4. The mineral processing method according to claim 1, characterized in that: The roughing flotation is carried out in the presence of water glass, saponified collector and frother; the first cleaning flotation is carried out in the presence of water glass, saponified collector and frother; the second cleaning flotation is carried out in the presence of water glass, saponified collector and frother; The saponified collector is prepared from raw materials including a collector, an alkaline substance and water; the collector is selected from one or more of salicylic acid, octyl hydroxamic acid, benzohydroxamic acid, naphthohydroxamic acid, P8, and 506E, and the alkaline substance is selected from one or more of sodium hydroxide and ammonia water; The foaming agent is selected from one or more of No. 2 oil and methyl isobutyl carbinol.

5. The mineral processing method according to claim 4, characterized in that: In the raw materials used to prepare the saponified collector, the mass ratio of the collector to the alkaline substance is 1:(0.05-0.5), and the mass of the collector is 0.5-5wt% of the total mass of the collector, the alkaline substance and water.

6. The mineral processing method according to claim 4, characterized in that: In step (1), per ton of rare earth ore, the amount of water glass is 500-2500 g, the amount of the saponified collector is 400-1600 g, and the amount of the foaming agent is 100-200 g; In step (2), per ton of rare earth ore, the amount of water glass is 100-500 g, the amount of the saponified collector is 100-400 g, and the amount of the foaming agent is 20-100 g; In step (4), per ton of rare earth ore, the amount of water glass is 10-300 g, the amount of the saponified collector is 50-300 g, and the amount of the foaming agent is 5-50 g.

7. The mineral processing method according to claim 1, characterized in that: flotation is performed again at N levels, where N is an integer greater than or equal to 2; Among them, the first-level secondary flotation includes the following steps: The first-stage concentrated ore is re-ground and then subjected to first-stage re-concentration flotation in the presence of TH908 ceramic dispersant to obtain first-stage re-concentrated concentrate and first-stage re-concentrated tailings; Among them, the second-stage re-concentration flotation to the N-stage re-concentration flotation respectively include the following steps: The m-1 grade re-concentrated concentrate is subjected to m grade re-concentration flotation in the presence of TH908 ceramic dispersant to obtain m grade re-concentrated concentrate and m grade re-concentrated tailings; m is an integer greater than or equal to 2 and less than or equal to N; N-level concentrated ore is rare earth concentrate; The first-level re-concentrated tailings to the N-level re-concentrated tailings are combined to obtain re-concentrated tailings.

8. The mineral processing method according to claim 1, characterized in that: The following steps are also included: The tailings are returned to step (1) for roughing flotation again; The tailings are then returned to step (2) for flotation again.

9. Use of TH908 ceramic dispersant as a depressant in rare earth ore flotation.

10. Use of TH908 ceramic dispersant in reducing the Ca and / or P content in rare earth concentrate.

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