N1923 Secondary Carbon Primary Amine Extractant

Application Scope

N1923 is a high-purity secondary carbon primary amine extractant professionally developed for strategic mineral hydrometallurgical separation. Its core industrial applications focus on tungsten, molybdenum, vanadium extraction and rhenium recovery, representing the major commercial usage fields of this reagent.

In tungsten hydrometallurgy, N1923 selectively extracts tungstate anions from sulfuric acid leach solutions of tungsten concentrates, enabling efficient enrichment and deep purification of tungsten-bearing solutions for ammonium paratungstate (APT) production. Its selective separation performance reduces impurity interference and supports stable production of high-purity tungsten products.

For molybdenum and vanadium processing, N1923 provides effective separation and purification of molybdate and vanadate ions from complex hydrometallurgical solutions. It helps solve impurity separation challenges in molybdenum-bearing ores and vanadium-titanium related processing systems.

In rhenium recovery applications, N1923 extracts perrhenate ions from smelting flue dust leachate and spent process solutions, supporting efficient recovery of valuable rhenium resources.

As secondary applications, N1923 assists in fine purification of gallium, germanium and indium from metallurgical by-product solutions, and supports minor impurity removal of antimony, bismuth and tin in multi-metal systems. It has no mature industrial application in lithium, copper-nickel-cobalt, tantalum-niobium and platinum group metal processing.

Extraction Mechanism

N1923 operates through protonated primary amine anion exchange extraction. Under weakly acidic and neutral conditions, the active amine groups form positively charged extraction sites that interact with negatively charged oxyanions of tungsten, molybdenum, vanadium and rhenium.

The formed lipophilic complexes transfer into the organic phase, achieving selective metal enrichment and separation. Compared with conventional primary amine extractants, its secondary carbon molecular structure provides improved selectivity, anti-interference capability and stable cyclic extraction performance.

Physicochemical Properties

N1923 features high primary amine purity, low viscosity and good organic phase fluidity. Its stable physical and chemical characteristics allow continuous operation in industrial solvent extraction circuits with reliable phase separation performance.

Specifications

Storage & Handling

Store N1923 in a cool, dry and well-ventilated warehouse under normal temperature conditions. Keep containers tightly sealed to prevent moisture absorption and oxidation. Avoid high-temperature exposure and contact with strong oxidizing substances.

During industrial handling, mixing and dosing operations, appropriate chemical protective equipment should be used to prevent direct skin and eye contact. Proper storage conditions ensure long-term stability and consistent extraction performance.

Advantages / Limitations

Advantages

N1923 provides high selectivity for tungsten, molybdenum, vanadium and rhenium oxyanion extraction. Its low viscosity, excellent fluidity and strong phase separation characteristics improve operational stability in continuous solvent extraction systems.

The reagent supports large extraction capacity, stable recycling performance and mild stripping conditions. Its adaptability in weakly acidic and neutral systems helps reduce reagent consumption and improve overall hydrometallurgical process efficiency.

Limitations

N1923 is specifically designed for oxyanion metal separation. It does not extract conventional divalent base metal cations or fluorine-complexed rare metals, resulting in a focused rather than universal application range.

Summary

N1923 Secondary Carbon Primary Amine Extractant is a high-efficiency reagent specialized for tungsten, molybdenum, vanadium and rhenium hydrometallurgical separation. With stable anion extraction capability, strong selectivity and reliable industrial adaptability, it provides cost-effective purification solutions for strategic mineral processing and metallurgical resource recovery.

N1923 Alkaline Amine Extractant – FAQ

Q1. What is the optimal acidity range for N1923 extraction of tungsten, molybdenum, and vanadium in sulfuric acid systems?

N1923 is an alkaline amine extractant designed for the recovery and separation of anionic metal complexes formed in acidic leach solutions. The optimal acidity range depends on the tungsten, molybdenum, and vanadium species present, as well as sulfate concentration and competing ions. In industrial hydrometallurgical applications, process optimization normally requires laboratory shake tests to evaluate distribution coefficients, phase separation behavior, and selectivity under different sulfuric acid concentrations. Parameters such as extractant concentration, organic-to-aqueous ratio (O/A), and temperature should be adjusted according to the specific ore leaching system to achieve stable extraction performance.

Q2. How does N1923 perform in selective extraction of tungsten and molybdenum from solutions containing arsenic and antimony impurities?

N1923 can provide selective extraction behavior toward target anionic metal complexes; however, impurity control is an important factor in tungsten and molybdenum hydrometallurgy. Arsenic and antimony species may influence extraction selectivity depending on oxidation state, acidity, and solution composition. Before industrial application, impurity removal steps or process adjustments may be considered to reduce unwanted co-extraction. Laboratory evaluation of phase equilibrium, impurity distribution ratios, and stripping characteristics is recommended to determine the most suitable N1923 operating conditions for complex tungsten or molybdenum leach solutions.

Q3. Can N1923 be combined with TBP to improve rhenium extraction from high-iron solutions?

N1923 and TBP may show complementary extraction characteristics in certain solvent extraction systems, especially when treating solutions containing multiple metal ions. The addition of a modifier or synergistic extractant can influence metal complex formation, phase stability, and selectivity. For high-iron solutions containing rhenium, the effectiveness of N1923/TBP combinations should be confirmed through laboratory testing, including iron interference evaluation, rhenium loading capacity measurement, and stripping performance analysis. Process parameters such as acidity, organic composition, and phase ratio require optimization to achieve a stable extraction circuit.

Q4. Does N1923 experience degradation or emulsification when treating high chloride tungsten and molybdenum solutions?

N1923 generally requires proper control of operating conditions when applied in high chloride systems. Chloride concentration, impurities, suspended solids, and organic contaminants can affect interfacial behavior, phase separation, and long-term extractant stability. Excessive emulsification risk may be reduced through appropriate solution clarification, organic phase management, and optimized mixing-settling conditions. For continuous solvent extraction operations, pilot testing is recommended to evaluate phase disengagement time, organic loss, and extraction performance under actual chloride-containing process conditions.

Q5. How does N1923 performance change in continuous counter-current extraction when acidity varies?

In continuous counter-current solvent extraction, acidity directly influences the formation of extractable anionic metal complexes and therefore affects distribution coefficients and separation factors. With N1923, changes in sulfuric acid concentration may alter tungsten, molybdenum, and vanadium extraction behavior differently. Process engineers typically optimize acidity together with extractant concentration, organic-to-aqueous ratio, and extraction stages to achieve the required separation efficiency. Laboratory equilibrium tests and pilot-scale counter-current simulation are commonly used to determine suitable operating windows before industrial implementation.

Q6. What stripping conditions are commonly used for tungsten loaded by N1923?

The stripping of tungsten from N1923-loaded organic phase usually depends on the chemical form of the extracted complex and the composition of the loaded organic phase. Alkaline stripping agents such as ammonia solution or sodium carbonate solution may be evaluated to convert extracted tungsten species into water-soluble forms. The optimal concentration, stripping stages, and phase ratio should be determined through laboratory testing based on tungsten loading level and impurity content. Proper stripping optimization helps maintain extractant recyclability and improves overall metal recovery efficiency in solvent extraction circuits.

Q7. How does N1923 extract anionic metal complexes such as ReO₄⁻ and MoO₄²⁻?

N1923 belongs to the amine extractant category, which primarily interacts with anionic metal complexes through ion-pair formation mechanisms in acidic media. Species such as perrhenate (ReO₄⁻) and molybdate (MoO₄²⁻) may exhibit different extraction behaviors depending on solution acidity, competing anions, and ionic strength. The selectivity between these metals should be evaluated through distribution ratio measurements and stripping tests. In practical recovery systems, N1923 performance is optimized by controlling solution chemistry to maximize target metal extraction while minimizing unwanted impurity transfer.

Q8. Is N1923 thermally stable for continuous operation above 50°C?

The thermal stability of N1923 depends on operating environment, including temperature, acidity, oxidizing conditions, and exposure time. In industrial solvent extraction circuits, maintaining moderate operating temperatures is generally preferred to preserve extractant performance and reduce organic phase degradation risks. When higher temperatures are required, long-term stability testing can be conducted to evaluate extraction capacity, phase behavior, and chemical integrity. Proper equipment design, temperature monitoring, and process control are important factors for reliable continuous operation with N1923.

Q9. Can N1923 and N263 be combined for efficient separation of tungsten, molybdenum, and vanadium?

N1923 and N263 have different chemical characteristics and may provide complementary extraction behavior for complex hydrometallurgical separation systems. Their combination can be considered when improved selectivity or process flexibility is required for tungsten, molybdenum, and vanadium recovery. However, the effectiveness depends on solution chemistry, target metal concentration, impurity levels, and circuit design. Laboratory comparison tests should evaluate extraction capacity, separation factors, stripping efficiency, and phase stability before selecting a mixed extractant system for industrial application.

Q10. What are the key process parameters for achieving high-purity rhenium recovery using N1923?

High-purity rhenium recovery with N1923 requires careful control of multiple process parameters, including feed solution composition, acidity, extractant concentration, phase ratio, extraction stages, and stripping conditions. Impurity management is also critical because elements such as molybdenum, tungsten, iron, and other anions may influence product purity. A systematic approach combining laboratory equilibrium testing, impurity distribution analysis, and pilot-scale verification is commonly used to optimize the solvent extraction circuit. N1923 can serve as a technical option for rhenium recovery systems when process conditions are properly designed and controlled.