Method for producing iron ore concentrate by using poor-tin oxidized ore tailings

A technology of oxidized ore and iron concentrate, applied in the direction of chemical instruments and methods, improvement of process efficiency, magnetic separation, etc., can solve the problems of inability to deal with polymetallic ore tailings, etc., and achieve easy industrial implementation, energy saving and consumption reduction Effect

Inactive Publication Date: 2009-09-30
GEJIU YULONG RENEWABLE RESOURCES MANAGEMENT
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

This method has a relatively simple process, less environmental pollution, and the recovery rate of tin can reach more than 40%, but it cannot handle refractory polymetallic ore tailings

Method used

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  • Method for producing iron ore concentrate by using poor-tin oxidized ore tailings
  • Method for producing iron ore concentrate by using poor-tin oxidized ore tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Raw material primary tailings main chemical composition mass percent (mass%): Fe 36.0, Cu 0.39, Pb0.45, Zn 0.50, Sn 0.16, S 0.115, P 0.03, As 1.98

[0031] (1) Dehydrating the raw material to less than 6% by mass, and grinding to a pulverized material with a particle size of less than 0.125mm.

[0032] (2) The pulverized material is subjected to 1-stage wet weak magnetic separation with a magnetic separator with a magnetic field strength of 1200-1600 Gauss to obtain No. 1 magnetically separated iron ore. The yield is 29.21%, the iron grade is 48.44%, and the direct recovery rate of metallic iron is 45.01%. Calculated by the difference, the magnetic separation tailings contain 29.68% iron.

[0033] (3) No. 1 magnetically separated iron ore is dried at 105°C until the water content accounts for less than 6% of the raw material. In a box-type resistance furnace, at a temperature of 930-960°C, air is used as an oxidant for oxidative roasting and dissociation. Th...

Embodiment 2

[0035] Example 2: Raw material secondary tailings main chemical composition mass percentage (mass %):: Fe 33.3, Cu 0.29, Pb 0.53, Zn 0.39, Sn 0.12, S 0.10, As 1.44;

[0036] (1) drying the raw material in the sun until the water content is below 6% by mass, and crushing to a pulverized material with a particle size of less than 0.125mm;

[0037] (2) Use a magnetic separator with a magnetic field strength of 8,000 to 10,000 gauss to carry out 1-stage dry strong magnetic separation to obtain No. 2 magnetic-separated iron ore with a yield of 42.86% and a magnetic-separated iron ore with an iron grade of 47.80% containing 1.45% As ; Metal iron beneficiation direct recovery rate of 61.43%. Calculated by the difference, the tailings contain 22.48% Fe.

[0038] (3) Take No. 2 magnetically separated iron ore, roast and dissociate at a temperature of 860° C. for 1.5 hours, the air volume is metered and supplied with 1200-1400 L / kg material, and the calcined sand is produced with a yie...

Embodiment 3

[0040] Embodiment 3: lead-arsenic magnetite in the raw material, main chemical composition mass percent (%): Fe 56.46, Cu 0.24, Pb 1.03, Zn 1.01, Sn 0.14, S 0.063, P 0.188, As 0.54. Particle size≤1mm.

[0041] (1) The raw material magnetite is roasted and dissociated at a temperature of 760°C for 1.5 hours, and the air volume is metered and supplied at 1300-1500L / kg·material to produce calcined sand with a yield of 92.65%.

[0042] (2) Slurry the calcined sand with water, stir and wash it with industrial hydrochloric acid at room temperature for 1.5 hours, the amount of acid is measured according to the mass ratio of calcined sand to hydrochloric acid 100:9.8, the pH of the solution at the end point is ≤ 1.0, and the acid-washed iron ore is rinsed with tap water Until the eluate is neutral and dried to obtain iron concentrate, the composition is (%): Fe 61.56, S 0.064, P 0.16, Pb 0.14, As 0.089. The yield of iron concentrate is 89.42%, and the iron recovery rate is 97.50%.

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Abstract

The invention relates to a method for producing iron ore concentrate by using poor-tin oxidized ore tailings, which comprises the following steps: by adopting a selection-smelting combined processing technique, producing magnetic separation iron ores by performing the first section of magnetic separation on the raw material poor-tin oxidized ore tailings; and performing roasting dissociation, acid cleaning and water cleaning treatment to remove impurities in the magnetic separation iron ores so as to obtain the iron ore concentrate. The iron ore concentrate containing 50 to 56.46 percent of iron also can be used as the raw material for producing the iron ore concentrate, which is also treated by the roasting dissociation, the acid cleaning and the water cleaning to obtain the iron ore concentrate. The iron grade of the iron ore concentrate reaches between 58 and 62 percent, and the content of harmful elements of sulfur, phosphonium, lead and arsenium also accords with the index requirement of the finished product of the iron ore concentrate. The method achieves the aims of effectively using ferrous metals in poor-tin tin oxide ore tailings, saving resources and energy sources, protecting the environment and comprehensively recycling associated metals.

Description

1. Technical field: [0001] The invention relates to a method for producing iron concentrate from tin-poor oxidized ore tailings, and belongs to the technical field of combined dressing and metallurgy treatment. 2. Background technology: [0002] As a result of the long-term development and utilization of tin ore resources by human society, tin resources are decreasing year by year, and the selected grades are getting lower and lower, and some are close to or even lower than tin tailings. Therefore, the necessity of using tin tailings as a secondary resource is increasingly recognized Pay attention to. But at present, the purpose of people using tin tailings is still mainly to recover metallic tin. [0003] At the beginning of 2005, during the investigation in Malaysia with the delegation, I saw a Chinese using multi-stage jigging process to process tin placer tailings with a tin grade of ≤0.10%, and produce tin concentrate with a tin grade of ≥60%. The process of this meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02B03C1/02
CPCY02P10/20
Inventor 杨茂才吴畏张京武
Owner GEJIU YULONG RENEWABLE RESOURCES MANAGEMENT
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