High Hematite Content Research Articles

The implementation of dust mineralogy in COSMO5.05-MUSCAT

Abstract. Mineral dust aerosols are composed of a complex assemblage of various minerals depending on the region in which they originated. Given the different mineral composition of desert dust aerosols, different physicochemical properties and therefore varying climate effects are expected. Despite the known regional variations in mineral composition, chemical transport models typically assume that mineral dust aerosols have uniform composition. This study adds, for the first time, mineralogical information to the mineral dust emission scheme used in the chemical transport model COSMO–MUSCAT. We provide a detailed description of the implementation of the mineralogical database, GMINER (Nickovic et al., 2012), together with a specific set of physical parameterizations in the model's mineral dust emission module, which led to a general improvement of the model performance when comparing the simulated mineral dust aerosols with measurements over the Sahara region for January–February 2022. The simulated mineral dust aerosol vertical distribution is tested by a comparison with aerosol lidar measurements from the lidar system PollyXT, located at Cape Verde. For a lofted mineral dust aerosol layer on 2 February at 05:00 UTC the lidar retrievals yield a dust mass concentration peak of 156 µg m−3, while the model calculates the mineral dust peak at 136 µg m−3. The results highlight the possibility of using the model with resolved mineral dust composition for interpretation of the lidar measurements since a higher absorption in the UV–Vis wavelengths is correlated with particles having a higher hematite content. Additionally, the comparison with in situ mineralogical measurements of dust aerosol particles shows that more of them are needed for model evaluation.

Late Holocene sediment provenance change in the Red River Delta: A magnetic study

Holocene climate change and human activities can lead to sediment composition variations. In this study, two drilled cores (VN and GA) from the Red River Delta, Vietnam, were subjected to magnetic measurement, as well as particle size, diffuse reflectance spectroscopy (DRS), and geochemical analyses, to infer Holocene sediment provenance changes. Both cores VN and GA cover estuarine, shallow marine, delta front slope, delta front platform, and delta plain facies in ascending order, with the former covering the whole Holocene while the latter covering the late Holocene. In the younger core GA, the clay content has a significant positive correlation with magnetic grain-size indicators (χARM/SIRM and χfd%) and a negative correlation with demagnetization parameters (S-100 mT and S-300 mT), reflecting the enrichment of fine-grained ferrimagnetic minerals and antiferromagnetic minerals in finer sediments. On the contrary, the relationship between the above-mentioned magnetic properties and clay content is not significant in core VN, reflecting the impact of stronger post-depositional diagenesis. In addition, diagenesis in the shallow marine and delta front slope facies of two cores is more pronounced, which is due to the fact of higher input of marine-sourced organic carbon. A magnetic comparison of the upper parts of two cores indicates that there are sediment source changes within the last 2000 years, which is supported by DRS analysis. Sediments in delta front slope and delta front platform of two cores have similar goethite content, but core GA contains higher hematite content indicating a drier condition. Such a sediment source change can be interpreted by variations of monsoon climate and reworking of soil due to human disturbance. Surface soil erosion due to human activities over the last 0.5 ka is supported by the presence of ultra-fine grained magnetite. Our study demonstrates that magnetic properties together with DRS analysis can provide insights into paleoclimate and paleoenvironmental change in deltaic environments.

Integrated spectral analysis of ASTER and gamma-ray spectrometric data to delineate alteration minerals for uranium exploration in Gabal Khashm El-Risha area, North Eastern Desert, Egypt

The main topic of this study is to integrate the spectral analyses of ASTER (VNIR-SWIR) with gamma-ray spectrometric data for mapping the alteration zones that affect in the distribution of the radioactive elements in Gabal Khashm El-Risha area, North Eastern Desert, Egypt. The spectral transformation techniques such as band ratios and minimum noise fraction in addition to mixture tuned matched filtering applicable to ASTER data are used to identify these altered zones. The applied techniques revealed approximately rapprochement between specific alteration minerals (i.e. hematite, goethite, muscovite, epidote, kaolinite and alunite) and the high potentiality of radioelements. The present work utilizes gamma ray spectrometric data (colored radioelements, contour maps, ratio maps and F-parameter) and correlated with the interpreted ASTER maps to allocate the possible zones of uranium mineralization. The associated abnormal level of radioactivity exhibits 10.5 and 24.2 ppm for eU and eTh respectively and mainly restricted to the syenogranites, which significantly have higher hematite content rather than the other exposures. Field-work and laboratory analysis validated the results obtained from ASTER data combined with gamma-ray spectrometric data.

Tailings after Iron Extraction in Bayer Red Mud by Biomass Reduction: Pozzolanic Activity and Hydration Characteristics.

Bayer red mud (BRM) is a kind of solid waste with high hematite content, and its effective utilization is difficult due to the special physicochemical properties. In this work, Fe2O3 in BRM was reduced to Fe3O4 by biomass, and iron concentrate and high activity tailings were obtained after magnetic separation. The pozzolanic activity and hydration characteristics of the tailings were systematically studied. The results showed that the relatively stable polymerization structures of Si-O and Al-O in BRM are destroyed under the effect of biomass reduction at 650 °C, and some fracture bonds and activation points are formed in the structures. The aluminosilicate phases in the BRM were easy to transform into the active substances of Si and Al. The pozzolanic activity of tailings is greatly improved, and its pozzolanic activity index is 91%. High polymerization degree of gel and ettringite are formed since more active substances and alkali in the tailings promote the hydration reaction of cement-based cementitious materials, which made cementitious materials have dense matrix, good mechanical properties, and environmental performance. This work has realized the full quantitative utilization of BRM and provided a feasible way for the resource utilization of BRM.

Effects of hematite on the stabilization of copper, cadmium and phosphorus in a contaminated red soil amended with hydroxyapatite.

Iron (Fe) oxides are intimately coupled with phosphorus and closely associated with the bioavailability of potential toxic elements (PTEs) in soil. Thus, Fe oxides may influence the stabilization of PTEs in contaminated soils amended by phosphorus. To evaluate the effects of hematite (HMT) on the stabilization of PTEs, 1-5% (by weight) of HMT was added into a contaminated red soil amended with hydroxyapatite (HAP) to simulate naturally occurring Fe oxides. The stabilization efficiencies of soil copper (Cu) and cadmium (Cd) amended with HAP in soils with low, moderate, and high content of HMT were assessed after a 60-day incubation. HAP treated the soil with high rate HMT decreased the CaCl2-extractable and acid-soluble fractions of Cu and Cd than that of HAP alone. In particular, CaCl2-extactable Cu and Cd in the soil with 5% HMT amended by HAP were 91-95% and 41-68% lower than those amended with only HAP. High content of HMT in soil could decrease the concentration of labile phosphorus in the presence of HAP, but it did not increase the concentration of NaOH-extractable inorganic phosphorus (the fraction bound to Fe oxides). The concentrations of free and crystalline Fe oxides were significantly increased by adding high dosages of HMT with or without HAP. High content of HMT in soil amended by HAP reduced metal phytotoxicity and uptake by wheat shoots than the soil containing HAP without HMT. The results indicate that HMT can promote Cu and Cd stabilization while decrease labile phosphorus in red soil amended with HAP, suggesting that phosphorus-based amendments combined with Fe oxides can be used to stabilize PTEs in contaminated red soils.

Sewage sludge ash as resource for phosphorous and material for clay brick manufacturing

Sewage sludge ash (SSA) contains the critical raw material phosphorous. International research shows that SSA may be utilized as a secondary resource in concrete, bricks or lightweight aggregates, but the high phosphorous content calls on recovery before such use. In the present investigation, phosphorous was recovered from SSA by electrodialytic separation (EDS), and the treated ash (SSA-EDS) was tested as partial clay substitute in brick manufacturing. The experimental work was made with fired brick discs of 2 cm in diameter. For comparison, similar tests were conducted with SSA-EDS and untreated SSA. During EDS, 84–91% phosphorous was recovered. The pH of the SSA was reduced from 10.2 to 3.7 during EDS, while the content of iron oxides increased. The brickwork clay contained about 17% carbonates, a major cause for firing mass loss. The reference brick discs were yellow. As the carbonate content decreased with increasing clay substitution (0–50% per weight), the firing mass loss decreased accordingly. The SSA was reddish due to a high iron oxide content, and the colour of the brick discs turned increasingly reddish with an increasing percentage of SSA and especially SSA-EDS. Thereby it may act as a colouring agent, to obtain desired red bricks, for which natural clays are becoming scarce. When fired at 1000 °C, all brick discs had apparent densities and open porosities within the accepted range of bricks used in the building industry. SEM micrographs showed that mixes with SSA-EDS fired at 1050 °C contained a glassy phase with isolated spherical pores, which may be related to the high hematite content of SSA-EDS. The formation of the glassy phase resulted in a decrease in open porosity with increasing substitution with SSA-EDS for the discs fired at 1050 °C, which was the reversed order compared to firing at 1000 °C.

Multi-analytical characterizations of prehistoric rock art pigments from Karim Cave, Sangkulirang–Mangkalihat site, East Kalimantan, Indonesia

This study introduced various characterization methods to determine the physicochemical properties of rock art pigments. The pigments were obtained from the Karim Cave, East Kalimantan. The pigments have purple, dark red, and red colors. The results of the characterization by using SR-XRD (Synchrotron Radiation-X-ray Diffraction) show that these pigments have the main content of calcite (CaCO3), gypsum (CaSO4.2H2O), whewellite (CaC2O4.H2O) and hematite (Fe2O3). Chemical analysis by using XRF showed that purple pigment has a higher hematite content than other pigments. The identification of functional groups by using FTIR on each pigment sample showed an absorption at the wavenumber of 475–447 cm−1 originating from the vibrations of the Fe3+−O bond. Furthermore, the electronic transition properties of the pigment material analyzed using Fe K-edge XANES show that the edge energy (E0) of each pigment sample is located at 7126.6 eV which indicates the Fe3+ iron species. The results of the deconvolution of pre-edge spectra show that the absorption ratio of t2g/eg in purple sample is lower compared to other pigments. The difference was caused by the distortion of octahedral coordination in hematite crystals that results in electronic structure changes. The distortion was also confirmed in the analysis of the centroid peak in the pre-edge spectra, where the integration value of the absorption intensity of the purple pigment sample was higher, compared to other samples. The results of this study indicate that the three pigments are derived from hematite minerals with different physicochemical properties.

Hematite enhances the immobilization of copper, cadmium and phosphorus in soil amended with hydroxyapatite under flooded conditions

Hydroxyapatite (HA) is often applied as chemical amendment in soils contaminated with trace metals such as copper (Cu) and cadmium (Cd). Large amounts of iron oxides in red soil may interacts with phosphate released from HA and influence trace metal immobilization of HA. Here we simulated a red paddy soil with 1–5% wt iron oxides by adding hematite and evaluated the Cu and Cd availability in soil amended with HA under flooded conditions. Changes in phosphorus and iron oxide fractions were also evaluated after a 42-day flooding incubation experiment. Results showed that the addition of HA-only and hematite-only decreased soil redox potential and increased pore water pH compared to the control. HA combined with hematite could effectively decrease phosphate, Cu and Cd in soil pore water compared to HA-only. Additionally, HA combined with hematite could also increase soil pH and decrease soil CaCl2-extractable Cu and Cd. In particular, HA combined with 5% hematite was most effective in reducing soil exchangeable fractions of Cu and Cd by 53.7% and 65.6% compared to the control, respectively. The addition of HA-only increased water-soluble phosphorus, NaHCO3-extractable inorganic phosphorus, NaOH-extractable inorganic phosphorus, and HCl-extractable phosphorus. Conversely, HA combined with hematite treatments decreased NaHCO3-extractable inorganic phosphorus by 11.3–43.0% compared to HA-only. Vivianite and metal–phosphate precipitates were not observed using the Visual MINTEQ model, X-ray diffraction, and chemical analysis. The addition of hematite with or without HA increased free and crystal iron oxide fractions, while it substantially enhanced amorphous iron oxides in the soil. Thus, this study indicates that soil with high hematite content could enhance Cu and Cd immobilization while decreasing phosphorus availability in the red paddy soil amended with HA under the flooded conditions.

Mineral Magnetic Characterization of Archeological Potsherds:An Example from the Deccan Province, Western Maharashtra, India

The ancient (archaeological) and modern potsherds sourced from Deccan basaltic soils and sediments at selected sites in the Bhima and Godavari river basins of the western Maharashtra, India, show characteris-tic mineral magnetic properties. High magnetic sus-ceptibilities (χ lf ) for the Deccan-sourced sherds enable their distinction from other sources in the region. The modern pottery sourced from Deccan soils shows sig-nificant lower χ lf than ancient pottery in the region, which further shows lower χ lf than the associated soils (/sediments) due to successive removal of detrital grains as a function of improvement in the pre-processing techniques. The ancient and modern pot-teries show higher superparamagnetic content that is otherwise absent in the source, suggesting its neo-formation during firing. High hematite content in modern pottery relative to ancient pottery further in-dicates higher oxidative firing in the former. Based on close examination of Isothermal Remanence Magneti-zation (IRM) acquisition rates, we suggest the ratios: IRM 1.8 mT /IRM 0.3–0.025 mT and HIRM/Soft IRM along with other routine mineral magnetic parameters to esti-mate the relative degree of oxidative heating, source discrimination and the levels of pre-processing of raw material amongst the Deccan-sourced pottery. The present approach being rapid and economic, a large quantitative database can be generated from the pot-sherds for detailed characterization of these archaeo-logical materials.

Synthesis of an Anticorrosive Pigment by Thermal Treatment of Iron Oxides from Steel Industry Wastes

This work reports the obtaining of an anticorrosive pigment composed mainly of hematite (ɑ-Fe2O3) from a powder steel industry waste from rust scale of rebar steel. This residue is mainly composed of Fe2O3 (87.97 %), SiO2 (6.13 %), CaO (1.88 %), Al2O3 (1.30%) and MnO (0.77 %). The total iron oxide of the residue is constituted by the following crystalline phases: magnetite, maghemita, lepidocrocita, wüstite, goethite and hematite. The production of a pigment with a high content of hematite was possible thanks to the high content of precursor iron oxides, which were calcined at different temperatures (750-850 °C) and holding times (0.5-1.50 h). For characterizing the iron content chemically and to identify their iron oxides phases, it was used X-ray fluorescence (XRF) and X-ray diffraction (XRD). The results showed that the pigment with the highest amount of hematite (ɑ-Fe2O3) was obtained at a calcination temperature of 850 °C and a holding time of 1.00 h.

Study on the Production and Metallurgical Properties of Fluxed Pellets with High Hematite Content

An experimental study on the preparation of fluxed pellets using common and widely available iron ore and additives was conducted. The number of drops, compressive strength, and cracking temperature of green pellets with different hematite and magnetite contents were analyzed. Some pellets that exhibited good properties were heated under different conditions. The effects of heating temperature and heating time on pellet strength were studied. The low-temperature reduction, refractoriness under load, and reduction swelling of pellets, and other influencing factors were analyzed. The internal structure of the pellets was examined with a microscope. The experimental results indicate that fluxed pellets with high hematite content prepared at a laboratory are easily oxidized and exhibit lower degree of low-temperature reduction. The refractoriness under load of pellets is 50°C greater than that of acid pellets, their refractoriness-under-load range is wider (130°C), and reduction swelling is less than 15%. Our findings indicate that the product can meet the blast-furnace production requirements.

Evaluation of the mercaptobenzothiazole degradation by combined adsorption process and Fenton reaction using iron mining residue

ABSTRACT The present study investigated the degradation of mercaptobenzothiazole (MBT), evaluating homogeneous and heterogeneous systems. An iron mineral residue from the desliming step of iron mining was used as a source in the Fenton-like reaction (advanced oxidation process). A granulometric analysis of the residue was performed and yielded fractions with high hematite (Fe2O3) and low quartz content in sieves from 74 to below 44 mm. In this particle size range, the hematite content from 58.9% to 67.4% and the Brunauer-Emmett-Teller area from 0.1345 to 1.3137 m2 g−1 were obtained. The zeta potential curves as a function of pH were obtained for the residue, the MBT solution and mixtures thereof. The adsorption of MBT in the residue and its degradation through the Fenton-like reaction were investigated. Adsorption tests and the Fenton-like reaction were carried out, where the MBT species and the residue are oppositely charged, yielding, respectively, 10% MBT adsorption on the surface of the residue and 100% MBT degradation by the Fenton-like reaction at pH 3, hydrogen peroxide concentration of 25 mg L−1, residue concentration of 3 g L−1, 200 rpm and 25°C, from a 100 mg L−1 MBT solution. MBT degradation was found to occur mainly by the heterogeneous Fenton-like process.

Morphology of Atmospheric Particles over Semi-Arid Region (Jaipur, Rajasthan) of India: Implications for Optical Properties

The regional dust morphology and spectral refractive indices (RIs; governed by hematite, Fe2O3 content at short wavelengths) are key elements for ascertaining direct radiative forcing of mineral dust aerosols. To provide morphological features of background mineral dust from a semi-arid zone in the vicinity of the Thar Desert, we carried out an expedition to the Jaipur city during late winter of 2012. Morphological analysis reveals the predominance of “Layered”, “Angular” and “Flattened” particles, while the frequency distribution of a total of 235 dust particles shows the aspect ratio, AR and circularity parameter, CIR (measures of particle’s non-sphericity) typically ~1.4 and ~0.8, respectively. Sensitivity analysis at 550 nm wavelength reveals the equivalent sphere model may underestimate Single Scattering Albedo, SSA for the dust with low (~1.1%) hematite by ~3.5%. Both underestimation (by ~5.6%) and overestimation (up to 9.1%) are probable in case of dust with high hematite content (~5.68%). In addition, the effect of AR on the dust scattering is significant in case of dust with high hematite content. More such regionally representative dust morphological data are required for better estimation of regional radiative forcing of mineral dust aerosols.

Study of Experiments on Dosage of the Flocculating Agent of Pure Minerals for the Overflow of Concentrate of the Before Mineral Processing of Strong Magnetism

Aimed at the characteristic that highcontent of hematite of valuable minerals in overflow of concentrate Before the strong magnetism from Sijiaying Concentrator, by that flocculation test of pure minerals of hematite, quartz, chlorite and investigate that flocculation effect of lime, PAC, PAFC of inorganic flocculants and PAM of organic flocculants to three kinds of pure minerals in this article. The test results show that the bigger sedimentation velocity difference hematite between quartz, chlorite when do not add any flocculants. When adding inorganic flocculants include lime, PAC, PAFC, flocculation effect is better to hematite and quartz, but flocculation effect is bad chlorite; Flocculation effect is better to three pure minerals when adding PAM of organic flocculants.

Compositional heterogeneity of picroilmenite from the Zarnitsa pipe according to the data of thermomagnetic analysis

Thirty-nine samples of picroilmenites from seven boreholes drilled along the submeridional profile in the Zarnitsa pipe of the Yakut diamondiferous province are examined. Individual microprobe determinations are conducted on two mutually perpendicular profiles of each sample in order to study compositional the heterogeneity of picroilmenite. Besides, the thermomagnetic curves are recorded for each sample. The model for processing the thermomagnetic curves based on the dependence of the parameters of the thermomagnetic curves (the Curie points and specific magnetic moment of picroilmenite) on hematite content in picroilmenite is suggested. The correct description of the experimental curve for each picroilmenite sample requires introducing two distributions of hematite concentration. The mean value of the first distribution coincides with the microprobe determinations, while the second distribution has a higher hematite content than the first one. It is shown that the areas with increased hematite content in the picroilmenite grains gravitate to the edges of the grains. It is hypothesized that the increase in hematite content is caused by epigenetic transformation of primary picroilmenite and it can probably serve as a proxy for the dynamics of picroilmenite formation. The applicability of the data of thermomagnetic analysis for the express determination of picroilmenite composition is assessed; the capabilities and limitations of the suggested procedure are demonstrated.

A new method for separation, characterization, and quantification of natural nanoparticles from soils

Properties and distribution dynamics of nanoparticles are pertinent to ecological and human health. Wide variation in particle density confounds their accurate separation for study. The objective of this study was to develop a fine-particle separation protocol requiring no constant density assumption. Six soils with contrasting properties were chosen for study. Size distributions of suspended particles following centrifugation were assessed using dynamic light scattering. Mineralogy was determined by X-ray diffraction. Particle characteristics were examined using transmission electron microscopy. A significant pooled logarithmic relationship was found between centrifugation speed and particle-size distribution. Nanoparticles (<100 nm) became dominant by fractional volume at widely differing separation energies among the six soils. However, relations were strong between separation energies and fractional volume for individual soils. Bi- and tri-modal-size distributions within suspensions were related to density differences of soil components. Re-aggregation at high separation energy was apparent for the tropical soils. Light-scattering, UV–Visible absorbance, and chemical analyses distinguished samples of high hematite content from those without hematite. These results indicate that dynamic light scattering in conjunction with a standard centrifuge regimen provides a practical means of collecting colloidal particles within a targeted size range, compensating for natural variations among the soil samples.

Induration Process of Pellets Prepared from Mixed Magnetite–35% Hematite Concentrates

To explore the possibility of successfully processing iron ore pellets with a high content of hematite, thermogravimetric tests were performed to study the induration process of pellets composed of a mixture of iron ore concentrates (magnetite and 35% wt of hematite). Thermogravimetric tests were performed nonisothermally from 25°C to 1400°C using two heating rates, 5 and 50°C/min. To identify the reactions involved and to follow the microstructural evolution throughout the induration process, selected tests were arrested at predetermined temperatures, and samples were rapidly cooled to room temperature for later characterization using X-ray diffraction (XRD) and scanning electron microscopy (SEM) along with energy dispersive spectroscopy (EDS). It was found that the formation of phases such as calcium ferrite (CF), magnesium ferrite (MF), silico-ferrites of calcium (SCF) and silico-ferrites of calcium and aluminum (SCFA) are influenced by the heating rate. The microstructure of the fired pellet processed at 50°C/min showed compact small grains of the sintered phase of the secondary hematite (SH), partially surrounded by a slag phase. In contrast, the fired pellet processed at 5°C/min exhibited a microstructure consisting of the SH phase with a faceted morphology surrounded by a relatively large amount of the slag phase. The results suggest that the pellet processed at 50°C/min had a more satisfactory response to the induration process.

Characterization of ash deposits from the boiler of Yenikoy coal-fired power plant, Turkey

Yenikoy power plant is a coal-fired electric power station with a 2×210 MW production capacity located in Mugla, Turkey. The plant burns a low quality, high calcium lignite, which causes significant operational problems due to slag formation in combustion units over time. This study aimed to characterize the ash deposits taken from one of the boilers of this particular power plant. The samples were collected from different elevations of the boiler and subjected to chemical, mineralogical and micro-textural analyses. Apart from Ca, significant concentrations of Fe, Al and Si were detected in ash deposits. Anhydrite was found to be the dominating crystalline phase and various forms of aluminosilicates, iron-oxide crystals and Fe–Ca bearing phases were also identified in the samples. The deposits basically consist of two layers; the inner layer characterized by a reddish-colored surface with high hematite content and the outer layer which was mostly in gray and light brown color due to the presence of high amount of calcium particles.

Quantifying the Role of Grain Lining Hematite Cement in Controlling Permeability in a Relatively Tight Gas Sandstone Reservoir From the North Sea

Summary Recent work has shown the potential usefulness of both magnetic-susceptibility and magnetic hysteresis techniques in assessing the effect of fine-grained hematite on permeability, where the hematite was dispersed in the matrix of relatively tight gas red sandstone samples. The present study demonstrates that grain lining hematite cement is also a major controlling factor on permeability in a relatively tight gas sandstone reservoir in the North Sea. Magnetic susceptibility measurements on core plugs in this reservoir showed a strong correlation with probe permeability. Moreover, samples with a higher content of hematite exhibited lower permeability values. Thin-section analysis revealed the presence of a thin (approximately 10 to 15 μm) rim of hematite cement surrounding quartz grains, which block pore connections and reduce permeability. Magnetic hysteresis measurements on representative samples indicated a similar paramagnetic clay content in both the low and high permeability samples, suggesting that the clay (mainly illite) is not the dominant controlling factor that produces the variations in permeability that we observed. Because samples with higher hematite content exhibit lower permeability, it appears that hematite is a major control on the permeability variations seen in this reservoir. Although the paramagnetic clays undoubtedly have an influence on the absolute permeability values (increasing paramagnetic clay content has previously been shown to correlate with decreasing permeability), small amounts of grain lining hematite cement can reduce the permeability significantly further. Analysis of the magnetic hysteresis parameters on a Day plot indicated that the permeability was essentially independent of the hematite particle size for the fine particle sizes observed in this study.

Response Surface Methodology for Optimization of the Chloridizing Roasting Process for a High Copper Pyrite Cinder

This study aimed to obtain volatile copper from a high-copper pyrite cinder by optimizing the chloridizing roasting process using response surface methodology (RSM). The effect of key parameters, i.e., dosage of CaCl2 addition, roasting time and roasting temperature, on the copper volatile ratio was investigated and a quadratic model was suggested by the methodology to correlate the variables to this volatile ratio. The results indicated that the model was in good agreement with the experimental data at a correlation coefficient (R2) of 0.9782, and the most influential parameter on efficiency was identified as the dosage of CaCl2 addition. The optimum conditions for chloridizing roasting from the high copper pyrite cinder were identified as a dosage of CaCl2 addition of 4.8 wt%, a roasting time of 19.28 min and a roasting temperature of 1151.51 °C; under such conditions, a copper volatile ratio of 97.82% was achieved. The pellets obtained by this process are characterized by a high content of hematite, and the main impurity element contents are consistent with the requirements for iron concentrate, which is suitable for use in ironmaking.