Pre-concentration of complex refractory iron ore - three-stage suspension roasting - magnetic separation treatment method
A technology of suspension roasting and treatment method, applied in chemical instruments and methods, magnetic separation, solid separation and other directions, can solve the problems of waste of resources, asynchronous reaction, poor sorting index, etc., achieve efficient recycling, improve recovery rate, The effect of improving the recovery rate
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Embodiment 1
[0054] The main components of the complex refractory iron ore used are shown in Table 1 (unit: wt%);
[0055] Table 1
[0056] Component TFe FeOSiO 2
Al 2 O 3
CaO content34.4312.849.410.150.39 Component MgOPSK Na content0.370.070.050.040.03
[0057] The results of chemical phase analysis are shown in Table 2;
[0058] Table 2
[0059]
[0060] The method is carried out as follows:
[0061] 1. Pre-magnetic separation: Grind the complex refractory iron ore to a particle size of -0.074mm accounting for 40% of the total weight, and then perform weak magnetic separation to obtain weak magnetic concentrate and weak magnetic tailings; The ore is subjected to strong magnetic separation to obtain strong magnetic separation concentrate and strong magnetic separation tailings; the strong magnetic separation concentrate is a mixture of hematite, siderite and limonite;
[0062] 2. Pre-oxidation: Put the strong magnetic separation concentrate into a suspension roaster, and air into the sus...
Embodiment 2
[0069] The iron grade of complex refractory iron ore is TFe 32%, and it contains 16% FeO and SiO by weight. 2 45%;
[0070] The method is the same as in Example 1, the difference is:
[0071] (1) Grinding complex refractory iron ore to a particle size of -0.074mm accounts for 50% of the total weight;
[0072] (2) Heat the materials in the suspension roaster to 700°C for pre-oxidation roasting, the pre-oxidation time is 30s;
[0073] (3) The reduction time is 15 seconds; the volume flow ratio of CO and nitrogen is 1:3;
[0074] (4) When the temperature drops to 350℃, air is introduced into the suspension roaster for reoxidation; the main component of the reoxidized material is magnetic iron γ-Fe 2 O 3 And Fe 3 O 4 ; Of which γ-Fe 2 O 3 The weight content is 60%, Fe 3 O 4 The weight content is 33%;
[0075] (5) When the part of the material after the secondary grinding to the particle size -0.044mm accounts for 50% of the total weight, the material after the secondary grinding is subjecte...
Embodiment 3
[0077] The iron grade of complex refractory iron ore is TFe 30%, and it contains 15% FeO and SiO by weight. 2 38%;
[0078] The method is the same as in Example 1, the difference is:
[0079] (1) Grinding complex refractory iron ore to a particle size of -0.074mm accounts for 60% of the total weight;
[0080] (2) Heat the materials in the suspension roaster to 600°C for pre-oxidation roasting, and the pre-oxidation time is 60s;
[0081] (3) The reduction time is 30 seconds; the volume flow ratio of CO and nitrogen is 1:5;
[0082] (4) When the temperature drops to 300℃, air is introduced into the suspension roaster for reoxidation; the main component of the reoxidized material is magnetic iron γ-Fe 2 O 3 And Fe 3 O 4 ; Of which γ-Fe 2 O 3 The weight content is 80%, Fe 3 O 4 The weight content is 14%;
[0083] (5) When the part of the material after the secondary grinding to the particle size -0.044mm accounts for 60% of the total weight, the material after the secondary grinding is subj...
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