O-Isopropyl-N-Ethyl Thionocarbamate (Z-200) – Selective Sulfide Mineral Flotation Collector
Application Scope
O-Isopropyl-N-Ethyl Thionocarbamate (Z-200, CAS 40384-60-1) is a selective thionocarbamate flotation collector widely used in sulfide mineral processing. Its strong collecting ability for copper sulfide minerals combined with weak affinity for pyrite makes it valuable in copper flotation and complex polymetallic separation circuits.
Copper Sulfide Ores (Primary Application)
Z-200 is primarily applied as a collector for chalcopyrite (CuFeS₂) flotation. It provides effective copper mineral recovery while maintaining selectivity against iron sulfide minerals, helping reduce pyrite contamination in copper concentrates.
Industrial flotation applications have demonstrated copper recovery levels up to 91.04% with optimized Z-200 dosage conditions. The collector is commonly applied in copper sulfide circuits where selective recovery, concentrate quality, and stable flotation performance are required.
Z-200 is also used in copper-lead-zinc polymetallic flotation systems as a selective copper collector, supporting separation processes where copper minerals must be recovered while limiting unwanted sulfide activation.
Molybdenum Sulfide Ores
Z-200 is applicable in molybdenum sulfide flotation circuits, particularly in copper-molybdenum separation processes. Studies indicate that Z-200 combined with other thionocarbamate collectors can improve molybdenum recovery performance, with reported recovery values reaching approximately 89% under optimized conditions.
In porphyry copper-molybdenum operations, Z-200 provides selective flotation characteristics compared with conventional xanthate collectors, supporting improved mineral separation efficiency.
Copper-Zinc Sulfide Separation
In polymetallic sulfide circuits containing copper and zinc minerals, Z-200 functions as a copper-selective collector. Its selective adsorption behavior supports chalcopyrite recovery while enabling separation from sphalerite and other associated sulfide minerals.
Research on chalcopyrite, galena, and sphalerite flotation systems demonstrates that Z-200 can contribute to selective copper recovery. Under optimized conditions around pH 9.5, the recovery difference between chalcopyrite and galena can reach approximately 20%.
Zinc Sulfide Ores (Sphalerite)
Z-200 has also been studied in zinc sulfide flotation systems. Although its main industrial application focuses on copper sulfide flotation, it can be applied in specific zinc circuits, particularly where copper-activated sphalerite recovery is required.
Additional Application – Precious Metal Sulfide Ores
Z-200 and related thionocarbamate collector systems demonstrate affinity for precious metals such as gold and silver associated with sulfide ores. These properties provide additional application potential in complex sulfide mineral processing.
Mechanism
Z-200 functions through selective surface adsorption and chemisorption on sulfide minerals. The thionocarbamate functional group interacts with copper atoms on chalcopyrite surfaces, forming Cu–S–C bonds that enhance mineral hydrophobicity and flotation response.
The isopropyl and ethyl groups in the molecular structure provide hydrophobic characteristics, improving bubble-particle attachment during flotation. This mechanism contributes to strong copper sulfide collection while maintaining weak interaction with pyrite surfaces.
The selective performance of Z-200 is related to differences in mineral surface chemistry. On chalcopyrite, collector adsorption is favorable, while competitive adsorption effects on other sulfide minerals can reduce unwanted recovery.
For molybdenite flotation, Z-200 interacts with the hydrophobic basal plane of molybdenum sulfide minerals mainly through physical adsorption effects.
Physicochemical Properties
| Parameter | Detail |
|---|---|
| CAS Number | 40384-60-1 |
| Synonyms | O-Isopropyl-N-ethylthionocarbamate; IPETC; Z-200 |
| Molecular Formula | C₆H₁₃NOS |
| Appearance | Colorless to pale yellow liquid |
| Purity (Typical) | ≥98% |
| Solubility | Slightly soluble in water; soluble in organic solvents |
| Density | Approximately 1.0 g/cm³ |
| Packaging | 200 kg drums or 1000 kg IBC tanks |
Specifications
Z-200 is supplied as a stable liquid flotation reagent suitable for industrial mineral processing applications. Its liquid formulation allows convenient storage, transportation, and reagent dosing in flotation plants.
| Specification Item | Typical Value |
|---|---|
| Product Type | Selective thionocarbamate collector |
| Main Application | Copper sulfide flotation and polymetallic sulfide separation |
| Mineral Target | Chalcopyrite, molybdenite, copper-activated sphalerite |
| Form | Liquid formulation |
Storage & Handling
Store Z-200 in a cool, dry, and well-ventilated area away from strong oxidizers, acids, and ignition sources. Containers should remain tightly sealed to prevent contamination and maintain reagent stability.
During handling, operators should use suitable personal protective equipment including chemical-resistant gloves, safety goggles, and protective clothing. Avoid direct skin contact and inhalation of vapors.
In case of accidental spillage, absorb the material using suitable inert materials and dispose of collected waste according to applicable environmental regulations. Under recommended storage conditions, the shelf life is approximately 24 months.
Advantages / Limitations
Advantages
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High selectivity for copper sulfide minerals with strong chalcopyrite collecting ability and weak pyrite affinity.
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Supports copper recovery improvement while helping reduce iron sulfide contamination in copper concentrates.
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Applicable in copper flotation, copper-molybdenum separation, and copper-lead-zinc polymetallic circuits.
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Industrial applications have demonstrated copper recovery exceeding 91% under optimized flotation conditions.
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Stable liquid formulation enables convenient reagent preparation and plant dosing.
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Can be used synergistically with other thionocarbamate collectors for optimized flotation performance.
Limitations
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Higher reagent cost compared with conventional xanthate collectors may require dosage optimization for large-scale operations.
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Performance depends on ore mineralogy, flotation chemistry, and circuit conditions.
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Limited effectiveness on oxide minerals unless appropriate sulfidization treatment is applied.
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May require combination with other collectors or flotation modifiers to achieve optimal separation performance.
Summary
O-Isopropyl-N-Ethyl Thionocarbamate (Z-200, CAS 40384-60-1) is a selective thionocarbamate collector primarily used in copper sulfide flotation, copper-molybdenum separation, and polymetallic sulfide mineral processing.
Through selective adsorption on chalcopyrite surfaces and weak interaction with pyrite, Z-200 helps improve copper mineral recovery while supporting concentrate quality control. Its proven application in porphyry copper and complex sulfide circuits makes it an important flotation reagent for selective sulfide mineral separation.
Although higher reagent cost requires careful dosage management, Z-200 remains a widely recognized collector option where copper selectivity, pyrite rejection, and flotation circuit stability are key process requirements.
Z-200 – FAQ
Q1. What types of non-ferrous metal sulfide ores are suitable for Z-200 flotation applications?
Z-200 is mainly applied as a collector for non-ferrous metal sulfide minerals, including copper, lead, zinc, nickel, and associated precious metal sulfide ores. Its application suitability depends on mineral composition, oxidation degree, liberation size, and existing flotation flowsheet conditions. In plant practice, Z-200 is commonly evaluated through laboratory open-circuit and closed-circuit tests to determine its selectivity, dosage requirement, and compatibility with depressants and frothers. For complex sulfide ores, Z-200 can be considered as part of a collector optimization program to improve mineral recovery balance and flotation stability.
Q2. How does Z-200 perform in copper-molybdenum sulfide ore flotation regarding selectivity and collecting strength?
Z-200 can be evaluated in copper-molybdenum sulfide flotation circuits where selective recovery of valuable sulfide minerals is required. Its collecting performance is influenced by mineral surface properties, pulp chemistry, pH conditions, and interaction with other flotation reagents. During copper-molybdenum separation, Z-200 should be tested together with existing collectors and depressants to assess its effect on copper recovery, molybdenum enrichment, and concentrate quality. Laboratory flotation tests under controlled conditions are recommended before plant-scale application to optimize reagent dosage and addition points.
Q3. Is Z-200 more advantageous than conventional xanthate collectors for nickel-cobalt sulfide flotation?
Z-200 and xanthate collectors have different chemical characteristics and flotation behaviors. In nickel-cobalt sulfide flotation, Z-200 may provide an alternative collector option when improved selectivity or different mineral surface interaction is required. However, performance depends on ore mineralogy, sulfide oxidation level, gangue composition, and process conditions. Comparative flotation testing between Z-200 and conventional collectors can help determine the suitable reagent combination for each deposit. Factors such as recovery, concentrate grade, reagent consumption, and downstream processing requirements should be considered during evaluation.
Q4. Is Z-200 suitable for fine-grained disseminated sulfide ores?
Z-200 can be evaluated for fine-grained disseminated sulfide ores where effective collector adsorption and flotation kinetics are important factors. Fine particle flotation performance is affected by mineral liberation, slime coating, pulp dispersion, and residence time. In these applications, grinding size optimization, pulp conditioning, and proper reagent sequence are critical for achieving stable flotation results. Laboratory testing should include different dosages, conditioning times, and frother combinations to determine whether Z-200 can provide suitable recovery and selectivity for fine sulfide mineral systems.
Q5. Can Z-200 be used together with xanthate collectors in sulfide mineral flotation circuits?
Z-200 can be investigated as a complementary collector in flotation circuits where xanthates are already used. The combination of different collectors may influence mineral selectivity, flotation kinetics, and concentrate quality. The appropriate ratio and addition sequence depend on ore characteristics and target minerals. In industrial applications, reagent compatibility tests are recommended to evaluate whether Z-200 can improve recovery or reduce unwanted gangue recovery when combined with xanthate systems. Process parameters such as pH, conditioning time, and flotation stage should be optimized through laboratory and pilot-scale testing.
Q6. How does Z-200 perform under different pulp pH conditions?
The flotation performance of Z-200 is influenced by pulp pH because mineral surface chemistry and collector adsorption behavior can change under different alkaline or acidic conditions. In sulfide flotation, pH adjustment is usually optimized according to the target mineral and the required selectivity against gangue minerals. Z-200 application tests should evaluate recovery, concentrate grade, and reagent consumption across the recommended pH range of the specific ore system. Maintaining stable pulp chemistry through proper use of regulators such as lime or other modifiers is important for consistent flotation performance.
Q7. Is Z-200 suitable for flotation circuits with high clay or high-viscosity pulp conditions?
High clay content and viscous pulp conditions can affect flotation performance by increasing reagent consumption, reducing bubble-mineral attachment efficiency, and causing concentrate contamination. Z-200 application under these conditions should be evaluated together with appropriate dispersion and conditioning strategies. The actual performance depends on clay mineral type, slime content, water chemistry, and grinding conditions. Laboratory testing with representative process water and ore samples can help determine suitable dosage levels and whether additional modifiers are required to maintain flotation selectivity and operational stability.
Q8. Can Z-200 be applied in oxidized sulfide ores, and are activators required?
For partially oxidized sulfide ores, Z-200 performance depends on the degree of surface oxidation and the availability of reactive mineral surfaces. When oxidation films reduce collector adsorption, pretreatment methods such as activation or surface conditioning may be considered depending on the ore characteristics. The requirement for activators should be determined through mineralogical analysis and flotation testing. Parameters including oxidation level, pulp potential, conditioning time, and reagent sequence should be evaluated to establish an effective flotation strategy for oxidized sulfide mineral systems.
Q9. What factors should be monitored when applying Z-200 in continuous industrial flotation tests?
During continuous industrial trials, key parameters for Z-200 evaluation include mineral recovery, concentrate grade, reagent dosage, flotation kinetics, pulp pH, oxidation-reduction conditions, and water quality variations. Changes in ore feed composition and mineral liberation can significantly influence flotation results. Monitoring both metallurgical performance and operational conditions helps determine whether Z-200 provides stable benefits under plant conditions. Pilot testing or staged plant trials are recommended before full implementation to confirm reagent performance and optimize addition locations within the flotation circuit.
Q10. How should Z-200 be stored and handled to maintain product stability?
Z-200 should be stored according to standard chemical handling practices in a dry, well-ventilated area away from moisture and incompatible materials. Proper packaging integrity and protection from excessive humidity are important for maintaining reagent quality during storage and transportation. Before use, mining operations should review the product technical documents, including safety information and handling recommendations. For international projects, storage conditions, transportation requirements, and workplace safety procedures should be confirmed according to applicable regulations and site management standards.