WO2021128922A1 - Application de composé de cyanure de 2-(3-ureido substitué)-n-hydroxy-2-oxoacétimide en flottation - Google Patents

Application de composé de cyanure de 2-(3-ureido substitué)-n-hydroxy-2-oxoacétimide en flottation Download PDF

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WO2021128922A1
WO2021128922A1 PCT/CN2020/112642 CN2020112642W WO2021128922A1 WO 2021128922 A1 WO2021128922 A1 WO 2021128922A1 CN 2020112642 W CN2020112642 W CN 2020112642W WO 2021128922 A1 WO2021128922 A1 WO 2021128922A1
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flotation
hydroxy
collector
oxoacetimide
calcium
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PCT/CN2020/112642
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English (en)
Chinese (zh)
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曹建
张晚佳
高志勇
冯知韬
杨宇航
孙伟
胡岳华
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中南大学
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Publication of WO2021128922A1 publication Critical patent/WO2021128922A1/fr
Priority to ZA2022/06168A priority Critical patent/ZA202206168B/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/001—Flotation agents
    • B03D1/004—Organic compounds
    • B03D1/01—Organic compounds containing nitrogen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D2203/00—Specified materials treated by the flotation agents; specified applications
    • B03D2203/02—Ores
    • B03D2203/04—Non-sulfide ores

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  • the invention belongs to the field of mineral flotation, and specifically relates to a high-separation flotation agent for calcium-containing minerals.
  • Fluorite, calcite and scheelite are three common calcium-containing minerals. Among them, fluorite is widely used as a fluxing agent in the metallurgical industry. At the same time, fluorite is also the main source of hydrofluoric acid. In addition, fluorite is also used in glass, ceramics, optics and military industries due to its unique properties. Scheelite is one of the main sources of tungsten, and my country's demand for scheelite and fluorite is increasing.
  • the most effective and commonly used method for the separation and utilization of calcium-containing minerals at this stage is through flotation.
  • Flotation is a beneficiation method that selectively separates minerals based on the difference in physical and chemical properties of the mineral surface. The flotation effect depends to a large extent on the use of flotation reagents, especially the use of flotation collectors.
  • one of the most important problems plaguing the flotation of calcium-containing minerals is fluorite, which is often accompanied by scheelite and calcite.
  • the commonly used collectors for calcium-containing minerals include fatty acids and their soaps, sulfates, sulfonates, etc.
  • the most commonly used collector is oleic acid.
  • oleic acid Although oleic acid has good collecting performance, this collector There is almost no sorting, and it is impossible to sort fluorite, scheelite and calcite. At the same time, oleic acid also has disadvantages such as poor water solubility, high temperature and water quality requirements, low concentrate grade and large fluctuations in indicators.
  • the cations of fluorite, scheelite and calcite are all Ca 2+ and have similar solubility. Therefore, in the flotation separation of calcium-containing minerals, inhibitors are often used to separate the minerals, but the addition of inhibitors will increase additional manpower and material resources. It also has an adverse impact on the environment, so it is of great significance to develop a collector that can efficiently separate fluorite, scheelite and calcite and has good foaming properties.
  • the purpose of the present invention is to provide an application of 2-(3-substituted ureido)-N-hydroxy-2-oxoacetimide cyanide compound, aiming to pass 2-(3-substituted ureido)-
  • the use of N-hydroxy-2-oxoacetimide cyanide compounds improves the flotation effect of calcium-containing minerals.
  • the second object of the present invention is to provide a flotation agent containing 2-(3-substituted ureido)-N-hydroxy-2-oxoacetimide cyanide compound.
  • the 2-(3-substituted ureido)-N-hydroxy-2-oxoacetimide cyanide compound is at least one compound having the structural formula of Formula 1;
  • R is hydrogen, C 1 -C 15 alkyl, C 3 -C 15 cycloalkyl, propenyl, ethynyl, phenyl, benzyl or benzyloxy; wherein, phenyl, benzyl, benzyloxy Substituents are allowed on the aromatic ring of the group.
  • the present invention finds that the compound of formula 1 is a non-ionic calcium-containing mineral collector. Through its molecular structure and intramolecular interaction between groups, it gives the molecule good foamability and excellent collection performance. And selectivity; using it as a collector for calcium-containing minerals, it can show good flotation selectivity and recovery rate, and can solve the urgent need to solve calcium-containing minerals in the industry, such as scheelite-fluorite-calcite mixed minerals. The problem of high-efficiency flotation separation, and the problem of high-efficiency removal of scheelite coarse concentrate.
  • the alkyl group is, for example, a straight chain alkyl group or a branched chain alkyl group.
  • the cycloalkyl group is preferably a three- to six-membered monocyclic alkyl group with the carbon number, or a bridged ring or spirocyclic alkyl group with six or more members.
  • the R is a hydrogen group, a C 2 -C 6 alkyl group, a C 3 -C 6 propenyl group, a phenyl group, an ethynyl group or a benzyl group.
  • R is hydrogen, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, propenyl, allyl, phenyl, benzyl or benzyloxy.
  • R is methyl, ethyl, butyl, pentyl, hexyl or phenyl. Studies have found that the compound has better effects in the flotation process of calcium-containing minerals.
  • the calcium-containing minerals are two or more minerals among scheelite and calcium-containing gangue.
  • the calcium-containing gangue contains at least one of fluorite and calcite.
  • the compound of formula 1 has good selectivity to two or more mixed ores of scheelite, fluorite and calcite, and can realize the selective flotation separation of the calcium-containing mixed ores; Improve the grade of useful minerals in flotation concentrates.
  • the preferred application is for the flotation separation of scheelite and calcium gangue.
  • the research of the present invention found that the compound of formula 1 has better selectivity to scheelite and other calcium-containing gangue (for example, at least one of fluorite and calcite), and can realize the negative flotation of scheelite. And realize the positive flotation of calcium-containing gangue, so as to realize the efficient separation of scheelite and calcium-containing gangue.
  • the calcium-containing mineral is crushed and slurried to obtain a slurry, and a compound containing 2-(3-substituted ureido)-N-hydroxy-2-oxoacetimide cyanide is added to the slurry.
  • a compound containing 2-(3-substituted ureido)-N-hydroxy-2-oxoacetimide cyanide is added to the slurry.
  • the flotation agent also contains a collector assistant.
  • a collector assistant the use of the existing collector assisting agent and the 2-(3-substituted ureido)-N-hydroxy-2-oxoacetimide cyanide compound of the present invention can produce a synergistic effect and reduce 2 -(3-Substituted ureido)-N-hydroxy-2-oxoacetimide cyanide compound dosage, not only that, but also can improve the flotation selectivity and recovery rate.
  • the auxiliary collector includes at least one of hydroxamic acid compounds, fatty acid compounds, phosphoric acid compounds, dodecylamine compounds and amino acid compound collectors.
  • the weight part of 2-(3-substituted ureido)-N-hydroxy-2-oxoacetimide cyanide compound collector is 70 to 98 parts; the weight part of the auxiliary collector is not More than 30 servings;
  • the weight parts of the 2-(3-substituted ureido)-N-hydroxy-2-oxoacetimide cyanide compound collector is 80 to 98 parts, and the weight of the auxiliary collector is 80 to 98 parts. Parts by weight are 2-20 parts.
  • the flotation agent containing the 2-(3-substituted ureido)-N-hydroxy-2-oxoacetimide cyanide compound collector of the present invention has a better synergistic effect, It is more conducive to effectively improve the recovery rate and concentrate grade of target calcium-containing minerals.
  • the pH of the flotation process is 6-8. Controlling the pH of the slurry during the flotation process is within 6-8, which can further exert the performance of the collector and further improve the flotation selectivity and recovery rate.
  • the amount of 2-(3-substituted ureido)-N-hydroxy-2-oxoacetimide cyanide compound collector is not less than 0.8 ⁇ 10 -4 mol/L ; It is preferably not less than 4 ⁇ 10 -4 mol/L.
  • the calcium-containing mineral is a mixed calcium-containing mineral containing two or more of scheelite, fluorite and calcite.
  • the 2-(3-substituted ureido)-N-hydroxy-2-oxoacetimide cyanide compound of the present invention is used in the flotation and purification of scheelite coarse concentrate containing fluorite and calcite impurities Has a better effect.
  • the present invention also provides a flotation agent for calcium-containing minerals, which includes 2-(3-substituted ureido)-N-hydroxy-2-oxoacetimide cyanide compounds.
  • the preferred flotation reagent also contains a collector assistant.
  • a collector assistant 2-(3-substituted ureido)-N-hydroxy-2-oxoacetimide cyanide compounds and auxiliary collectors have good synergy, which can improve the flotation effect of calcium-containing minerals, such as , Improve the flotation selectivity, and enhance the grade of useful mineral concentrates.
  • the auxiliary collector may be an existing collector in the field of calcium-containing mineral flotation, such as hydroxamic acid compounds, fatty acid compounds, phosphoric acid compounds, dodecylamine compounds and amino acid compound collectors. At least one of.
  • the weight part of the 2-(3-substituted ureido)-N-hydroxy-2-oxoacetimide cyanide compound collector is 70 to 98 parts, more preferably 80 to 98 parts; the weight part of the auxiliary collector is not more than 30 parts, more preferably 2-20 parts.
  • the application method of the flotation agent of the present invention can adopt the existing conventional method.
  • the pH during the flotation process is preferably controlled to be 6-8.
  • the concentration of the flotation agent in the slurry is not less than (greater than or equal to) 1 ⁇ 10 -4 mol/L; preferably, it is not less than 5 ⁇ 10 -4 mol/L.
  • the present invention found that the use of 2-(3-substituted ureido)-N-hydroxy-2-oxoacetimide cyanide compounds as flotation collectors for calcium-containing minerals can exhibit good flotation performance. Select selectivity and recovery rate.
  • the research of the present invention also found that the compounding of 2-(3-substituted ureido)-N-hydroxy-2-oxoacetimide cyanide compound and auxiliary collector has a synergistic effect, not only Synergistically increase the collection capacity of calcium-containing minerals, enhance the stability of the foam, and effectively reduce the amount of 2-(3-substituted ureido)-N-hydroxy-2-oxoacetimide cyanide compound collector , And effectively improve the flotation concentrate grade and recovery rate.
  • Table 1 The original grade and origin of the minerals used in the examples.
  • Figure 1 is a flotation flow chart of Example 1
  • Figure 2 is a graph of the recovery rate of the flotation reagent in Example 1;
  • Table 2 is a data table of the recovery rate of the flotation reagent in Example 1;
  • Figure 3 is the recovery rate table of the flotation reagent of Example 2.
  • Table 3 is the recovery rate table of the flotation reagent in Example 2.
  • Figure 4 is a graph of the recovery rate of the flotation reagent in Example 3.
  • Table 4 is the recovery rate table of the flotation reagent in Example 3.
  • Figure 5 is a flotation flow chart of Example 4 and Comparative Example 1;
  • Table 5 shows the composition and ratio of the artificial mixed minerals of Example 4 and Comparative Example 1.
  • Table 6 shows the flotation results of Example 4 and Comparative Example 1;
  • Table 7 is Example 5, the grade of each component in artificial mixed mineral 1 # -4 #
  • Figure 6 is the NMR H spectrum of the 2-(3-ethylureido)-N-hydroxy-2-oxoacetimide cyanide compound of the present invention (R is ethyl);
  • Fig. 7 is the NMR C spectrum of the 2-(3-ethylureido)-N-hydroxy-2-oxoacetimide cyanide compound of the present invention (R is an ethyl group).
  • N-R substituted urea (formula A) and 2-cyanoacetic acid (formula B) are added to anhydrous acetic acid and reacted at 70° C. to obtain an intermediate product (C).
  • step (1) The intermediate product obtained in step (1) and sodium nitrite are placed in acetonitrile, and hydrochloric acid is added to react at 45° C. to obtain the target product (the compound of formula 1).
  • the flotation collector of the present invention 2-(3-ethylureido)-N-hydroxy-2-oxoacetimide cyanide compound (in formula 1, R is ethyl), terpineol Add 1L of deionized water (with a concentration of 0.1mol/L) in the ratio of 0.095mol:0.005mol, and magnetically stir at 65°C for 30min to make the agent fully mixed and seal for use.
  • the specific operation is: dry grind the concentrate ore (particle size 3mm-0.5mm) for 15 minutes (the particle size after grinding is 0.0740-0.0374mm, using a horizontal ball mill for dry grinding, the grinding concentration is 35-40%), Weigh 2g of the ground calcium-containing concentrate (fluorite, calcite or scheelite) from each group into a 40mL flotation tank, add 30mL of deionized water and then add the flotation collector described in this case to supplement the appropriate amount of deionization Water, stir for 3 minutes, start to scrape foam, scrape foam for 3 minutes, the concentrate is scraped to the concentrate basin with the foam, the tailings remain in the flotation tank, the concentrate and tailings are respectively weighed after being filtered and dried. The grade of the mine is tested and the recovery rate is calculated.
  • FIG. 2 shows Example 1, the recovery rates of scheelite, fluorite and calcite concentrates under different dosages of medicaments.
  • the flotation collector in this case is a flotation reagent, and the pH of the slurry is 7).
  • the flotation reagent described in this case has a strong selective collection capacity for complex calcium-containing minerals, especially for scheelite, which can be efficiently recovered.
  • Scheelite is separated from fluorite and calcite, which can be used to remove impurities from scheelite concentrate in industry.
  • the flotation collector described in this case can efficiently separate fluorite and scheelite and to a certain extent can separate fluorite and calcite.
  • R is an ethyl compound
  • benzyl hydroxamic acid terpineol
  • 1L of deionized water with a concentration of 0.1mol/L
  • FIG 3 shows Example 1, the recovery rates of scheelite, fluorite and calcite concentrates under different dosages of medicaments.
  • the flotation reagent in this case is a flotation reagent, and the pH of the slurry is 7).
  • the flotation reagent described in this case has a strong selective collection capacity for complex oxide ore, especially for scheelite, which can efficiently collect fluorescens.
  • Scheelite is separated from stone and calcite, which can be used to remove impurities from scheelite concentrate in industry.
  • the recovery rate of the compound flotation reagent in this case for fluorite reaches about 50%, and the recovery rate of the compound flotation reagent in this case is calcite It is only 4.89%, and the recovery rate for scheelite is only 0.71%, which means that the combined flotation reagent in this case can efficiently separate fluorite and scheelite and to a certain extent can separate fluorite and calcite.
  • the recovery rate of fluorite by the compound flotation reagent in this case has increased by 43.97%, and the concentration of the reagent is 5 ⁇ 10
  • the recovery rate at -4 mol/L was 94.38%.
  • the recovery rate of calcite increased by 23.53%, and the recovery rate was 28.42% when the concentration of the agent was 5 ⁇ 10 -4 mol/L.
  • the recovery rate of scheelite has been kept below 3%. This shows that with the increase of the dosage of the reagent, the flotation reagent compounded in this case can further improve the sorting performance of fluorite, calcite and scheelite.
  • Pulp pH is one of the most important parameters to control the flotation process, and it may have a direct impact on mineral surface electrical properties, cationic hydrolysis, reagent flotation activity, adsorption properties, and sludge dispersion and agglomeration.
  • the specific operation is: dry grinding the concentrate ore (particle size 3mm-0.5mm) for 15 minutes (after grinding the particle size 0.0740-0.0374mm), dry grinding with a horizontal ball mill, and the grinding concentration is 35-40%.
  • Each group weighs 2g of the ground concentrate and pours it into a 40mL flotation tank, adds 30mL of deionized water and then adds the flotation agent.
  • the dosage of the two flotation agents is 5 ⁇ 10-4mol/L, and an appropriate amount of deionized water is added.
  • the pH gradient set in the experiment is: 4,5,6,7,8,9,10.
  • the main component of calcite is CaCO3, which means that calcite will decompose under acidic conditions.
  • the pH gradient of calcite is: 6, 7, 8, 9, 10.
  • Figure 4 shows the recovery rates of Example 3 scheelite, fluorite and calcite concentrates at different pHs.
  • concentration of the flotation reagent in this case is 5 ⁇ 10 -4 mol/L
  • the initial pH value of fluorite flotation is 7
  • the initial pH value of calcite flotation is 9
  • the initial pH value of scheelite flotation is 6, all adjusted to pH
  • the flotation experiment was carried out at 7, and the pH adjusting agent was sodium hydroxide solution and hydrochloric acid solution).
  • the flotation agent of the present invention 2-(3-ethylureido)-N-hydroxy-2-oxoacetimide cyanide compound (in formula 1, R is ethyl), benzyl hydroxamic acid , Terpineol is added to 1L of deionized water (with a concentration of 0.1mol/L) in the ratio of 0.090mol:0.005mol:0.005mol, and magnetically stirred at 65°C for 30min to make the agent fully mixed and sealed for use.
  • Benzyl hydroxamic acid compound medicament (comparative example 1): Add benzyl hydroxamic acid and terpineol into 1L deionized water (concentration of 0.1mol/L) at the ratio of 0.095mol:0.005mol, Stir magnetically at °C for 30 minutes to make the medicines mix well and seal for use.
  • the specific operation is: dry grind the concentrate ore (particle size 3mm-0.5mm) for 15 minutes (the particle size after grinding is 0.0740-0.0374mm, using a horizontal ball mill for dry grinding, the grinding concentration is 35-40%), Each group weighs 2g of the concentrate, which has been ground and evenly mixed in proportion, and poured into a 40mL flotation tank. After adding 30mL of deionized water, add benzyl hydroxamic acid and the series of flotation reagents described in this case, and add an appropriate amount of deionization.
  • the concentration of water and flotation reagent are both 5 ⁇ 10 -4 mol/L, the pH of the pulp is 7, stirring for 3 minutes, start to scrape foam, scrape foam for 3 minutes, the concentrate is scraped to the concentrate basin with the foam, and the tailings remain in the flotation In the tank, the concentrate and tailings are filtered and dried and weighed separately. The grade of the concentrate is detected and the recovery rate is calculated.
  • the series of artificial mixed minerals 1 # -4 # in this case The specific mixing ratio is as follows:
  • Artificial mixed mineral # 1 in this case: 1g of fluorite, 1g of calcite, mechanically stirred at room temperature for 10 minutes, so that the minerals are fully mixed, and sealed for use;
  • Artificial mixed mineral 2 # in this case: 1g of fluorite, 1g of scheelite, mechanically stirred at room temperature for 10 minutes, so that the minerals are fully mixed, and sealed for use;
  • Artificial mixed mineral 3 # in this case: 1g of calcite, 1g of scheelite, mechanically stirred at room temperature for 10 minutes, so that the minerals are fully mixed and sealed for use;
  • Artificial mixed mineral # 4 in this case: 0.5g of fluorite, 0.5g of calcite, 1g of scheelite, mechanically stirred at room temperature for 10 minutes, so that the minerals are fully mixed and sealed for use;
  • Table 5 is Example 4, the grade of each component in the artificial mixed mineral 1 # -4 #.
  • Table 6 shows Example 4, the flotation recovery rate and grade of fluorite, calcite and scheelite.
  • the concentration of flotation reagent in this case is all 5 ⁇ 10 -4 mol/L, and the initial pH value of fluorite, calcite and scheelite is adjusted to 7)
  • the flotation agent in this case has a significantly stronger collection capacity for the fluorite and calcite in the artificial mixed ore 1 # -4 # Benzyl hydroxamic acid.
  • the collection capacity of the flotation reagent in this case for scheelite is obviously weaker than that of benzyl hydroxamic acid.
  • the separation effect of the flotation agent in this case has been significantly improved, and the recovery rate of useful minerals has also been significantly improved. It can be seen that the flotation reagent in this case is more effective than the traditional oxide ore flotation reagent benzyl hydroxamic acid, and the separation effect is better.
  • the flotation agent 1# of the present invention Combine 2-(3-substituted ureido)-N-hydroxy-2-oxoacetimide cyanide compound (in formula 1, R is pentyl), benzyl hydroxyoxime Acid and terpineol were added to 1L of deionized water (with a concentration of 0.1mol/L) in the ratio of 0.090mol:0.005mol:0.005mol, and magnetically stirred at 65°C for 30min to make the agent fully mixed and sealed for use.
  • the flotation agent 2# of the present invention Combine 2-(3-substituted ureido)-N-hydroxy-2-oxoacetimide cyanide compound (in formula 1, R is phenyl), benzyl hydroxyoxime Acid and terpineol were added to 1L of deionized water (with a concentration of 0.1mol/L) in the ratio of 0.090mol:0.005mol:0.005mol, and magnetically stirred at 65°C for 30min to make the agent fully mixed and sealed for use.
  • the specific operation is: dry grind the concentrate ore (particle size 3mm-0.5mm) for 15 minutes (the particle size after grinding is 0.0740-0.0374mm, using a horizontal ball mill for dry grinding, the grinding concentration is 35-40%), Each group weighs 2g of the concentrate, which has been ground and evenly mixed in proportion, and poured into a 40mL flotation tank. After adding 30mL of deionized water, add benzyl hydroxamic acid and the series of flotation reagents described in this case, and add an appropriate amount of deionization.
  • the concentration of water and flotation agent are both 5 ⁇ 10 -4 mol/L, the pH of the slurry is 7, stirring for 3 minutes, start to scrape foam, scrape foam for 3 minutes, the concentrate is scraped to the concentrate basin with the foam, and the tailings remain in the flotation In the tank, the concentrate and tailings are filtered and dried and weighed separately. The grade of the concentrate is detected and the recovery rate is calculated.
  • the series of artificial mixed minerals 1 # -4 # in this case The specific mixing ratio is as follows:
  • Artificial mixed mineral # 1 in this case: 1g of fluorite, 1g of calcite, mechanically stirred at room temperature for 10 minutes, so that the minerals are fully mixed, and sealed for use;
  • Artificial mixed mineral 2 # in this case: 1g of fluorite, 1g of scheelite, mechanically stirred at room temperature for 10 minutes, so that the minerals are fully mixed, and sealed for use;
  • Artificial mixed mineral 3 # in this case: 1g of calcite, 1g of scheelite, mechanically stirred at room temperature for 10 minutes, so that the minerals are fully mixed and sealed for use;
  • Artificial mixed mineral # 4 in this case: 0.5g of fluorite, 0.5g of calcite, 1g of scheelite, mechanically stirred at room temperature for 10 minutes, so that the minerals are fully mixed and sealed for use;
  • Table 7 shows the grade of each component in the artificial mixed mineral 1 # -4 # in Example 5.
  • Table 8 shows Example 5, the flotation recovery rate and grade of fluorite, calcite and scheelite.
  • the flotation agent of Formula 1 of the present invention has good positive flotation collection for fluorite and calcite, reverse flotation effect for scheelite, and can selectively separate scheelite and calcium-containing gangue (Such as fluorite and calcite).

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Abstract

L'invention concerne une application d'un composé de cyanure 2-(3-ureido substitué)-N-hydroxy-2-oxoacetimide en flottation, qui est utilisé comme collecteur de flottation pour la séparation par flottation de minéraux contenant du calcium, le composé de cyanure de 2-(3-ureido substitué)-N-hydroxy-2-oxoacetimide présentant un excellent effet de séparation par flottation et une excellente performance de moussage de minéraux contenant du calcium, son mélange avec des collecteurs auxiliaires va permettre de réduire davantage le dosage et d'améliorer la performance de flottation ; l'invention concerne en outre un agent de flottation minéral contenant du calcium, qui comprend le composé de cyanure de 2-(3-ureido substitué)-N-hydroxy-2-oxoacetimide et des collecteurs auxiliaires. Le réactif de flottation peut préférentiellement permettre la flottation de fluorine et de calcite ; et dans des conditions neutres (pH = environ 7), il peut obtenir une séparation hautement efficace de la fluorine et de la calcite à partir de la scheelite et peut purifier efficacement le concentré de scheelite brut et améliorer le grade de concentré de scheelite et, en même temps, un environnement de flottation neutre réduit son impact sur l'environnement.
PCT/CN2020/112642 2019-12-23 2020-08-31 Application de composé de cyanure de 2-(3-ureido substitué)-n-hydroxy-2-oxoacétimide en flottation WO2021128922A1 (fr)

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CN111701728B (zh) * 2020-06-30 2021-07-30 中南大学 一种萤石和含钙脉石的选择性浮选分离方法
CN112791859B (zh) * 2020-12-21 2022-07-19 湖南新田岭钨业有限公司 一种磷酸氨酸化合物的应用

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