No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
According to Fig. 5a, the concentrate recovery shows a downward trend with the increase of flotation time due to the increase of flotation time causing more hematite to be included in the products. However, the trend change of concentrate recovery is not very obvious when the flotation time exceeds 30 s.
therefore be made directly; the high-grade coarse specularite concentrate is an attractive starting point for super-concentration. EARLIER TEST WORK In 1959, tests were made on a coarse specular hematite gravity con-centrate with the object of producing a low-silica hematite concentrate for direct reduction in a kiln to iron powder (1).
By combining magnetic separation, flotation, and alkali leaching, an ordinary iron concentrate with a TFe grade of 65.56 % can be refined to a high-purity concentrate with a TFe grade of 72.30 %, an overall recovery of 35.68 %, and a magnetite purity of 99.91 %.
† The concentrate is composed basically of hematite and dolomite. Besides iron recovery from concentrate, it is known that the material can act as a fluxing agent
The essence of the enhanced Ms of the product was the transformation of hematite and siderite into magnetite. Also, due to the high iron recovery (99.48%) and iron yield (98.86%) of the concentrate, there was little magnetic difference between the roasted product and the concentrate product, as shown in Fig. 12 (b).
The experimental results show that the recovery of fine hematite is improved in the presence of CMS in the high-intensity magnetic separation (HIMS) with sufficient kinetic …
There is a mass loss after 180 °C for the synthesized magnetite (≈180–270 °C) concentrate and the hematite concentrate (≈200–350 °C), respectively. The losses might be …
The flotation of pure and natural carbonaceous iron ore samples in the oleate flotation system was investigated. Starch can depress hematite effectively in a wide pH range, but cannot depress siderite efficiently in neutral conditions. The flotation recovery of pure hematite, siderite, and quartz in the oleate-starch-CaCl2 system is significantly different when the slurry …
Material composition of a sample from a tailings dump was analysed. The authors have developed a separation production technology to recover magnetite-hematite concentrate from the tailings. A processing flowsheet includes magnetic separation, milling and gravity …
High-phosphorus (P) iron ore, particularly oolitic hematite, has remained unexploited due to technological and cost limitations in mining. Effectively developing this ore involves not just utilizing its iron content but crucially extracting P to reduce exploitation costs. Here, we applied a direct reduction-magnetic separation process to recover these valuable …
hematite concentrate to be used in iron and steel industry. The main targets were to increase Fe ... (-9,53+6,35 mm) containing 51.1%Fe with 67.89% recovery was obtained from a
From Fig. 5, as the increase of the grinding time, both of the recovery and grade of iron concentrate increased continuously until peaking and then declined slowly. When grinding 12 min, the percentage of minus 74 μm was 100 mass%, the maximum value of the recovery and grade of iron concentrate was 87.5% and 61.6 mass%.
The separation technology provides for production of iron ore concentrate with total iron content of 65.9% and recovers 91.0% of magnetite and 80.5% of hematite from the tailings containing 20.4% of total iron. The proposed technology will increase production of the concentrate at a dressing plant and reduce environmental impact.
The effect of the CMS dosage on the flocculation magnetic separation index of fine hematite is shown in Fig. 2.As shown, the recovery of the concentrate increased rapidly from 59.97% to 65.08%, while the grade of the concentrate decreased with the CMS content increasing from 0 g/t to 400 g/t.
For example, Guo (2003) demonstrated that fine hematite can be recovered from fine-grained hematite ore containing quartz by adding coarse hematite (−50 +25 μm). With a …
Dodecyl amine acetate was used as a collector to float siliceous gangue while depressing hematite using the freshly synthesized caustic starch as a depressant. The …
The weak magnetic-strong magnetic separation method is mostly used for the treatment of magnetite-hematite mixed ore. After the weak magnetic separation tailings are concentrated, strong magnetic roughing and sweeping are carried out, and the strong magnetic rough concentrate is concentrated and selected by a strong magnetic separator.Due to the …
Using Route 2, the process consisted of WHIMS at 74 m, D80 54 m, 10,000 Gauss, and with a 3 mm ball matrix, followed by flotation of the WHIMS concentrate, which produced a concentrate through ...
Recent pilot testing conducted by Zhong demonstrated the production of hematite ore powder with an impressive overall recovery rate of 85.61% by employing coal-based …
Fig. 4 shows the effect of magnetite addition on the changes in grade and recovery of hematite in concentrate (non-floated product) and quartz in tailings (froth product). As shown in Fig. 4, the recovery of hematite increased 6.0%, from 88.5% to 94.5%, whereas recovery of quartz increased by nearly 10% with addition of 4 wt% of magnetite. More ...
The concentration circuit is shown in Figure 1: F= 35% Fe Sy=? ME FT-129 Fe Regrind M.S Spiral Me=? R=? Sc: 66.49 Fe R= 70% Fc = 66.8% R=2 Figure 1: Magnetite and hematite concentrator The final tailings assays 12% Fe while the final concentrate is at 66.8% Fe. 1.1 What is the iron recovery to the final concentrate if the feed grade is 35% Fe? 1.2.
For a given concentrate grade, the mass yield obtained was greater when the total particle-size distribution was treated. The inferred optimum conditions, using the same …
Figure 1: Magnetite and hematite concentrator The final tailings assays 12% Fe while the final concentrate is at 66.8% Fe. 1.1 What is the iron recovery to the final concentrate if the feed grade is 35% Fe? 1.2. If 70% of the iron is …
reduce the quality of the hematite concentrate. The chemical composition of hematite, determined by local. X-ray spectral analysis, is given in Table 3. ... product, and ε is the recovery of the ...
Recovery and grade are the two crucial performance parameters commonly used in mineral processing plant operations. These two parameters are interdependent. An increase in recovery would result in a decreased product grade and vice versa. The present study enumerates concentration efficiency (CE),which can be adopted exclusively for processing low …
The research is aimed at study of the probable recovery of iron from the tailings of the Olcon mining company located in the north-western Arctic zone of Russia. Material composition of a sample from a tailings dump was analysed. The authors have developed a separation production technology to recover magnetite-hematite concentrate from the tailings. A processing …
With an Fe grade of 65.25% at a recovery value of 72.5% in the concentrate, magnetic separation produced the greatest result for Fe. The performance of magnetization and therefore the magnetic ...
The iron-containing species are hematite, iron sulfate and jarosite after POX. ... A residue from pressure leaching of chalcopyrite concentrate was collected and investigated for gold recovery and deportment of metals. A comprehensive mineralogical analysis and gold deportment study were conducted using techniques including X-ray diffraction ...
Since hematite and dolomite particles have different densities, 5.25 and 2.87 g/cm 3, respectively, and that method requires less energy, this paper aims to concentrate hematite from a zinc mining tailing composed of 3% SiO 2, 7% Fe 2 O 3, and 90% CaMg(CO 3) 2 through gravity separation using shaking table.
The results of these pilot tests demonstrated the possibility of obtaining a hematite concentrate with an iron content of 61.5% and a recovery rate from the operation of 23.1%. In this work, to increase the iron content in the concentrate, flotation was performed on deslimed samples of hematite ore with a particle size of −0.1 mm.
