Ore dressing method for removing pyrrhotite from iron ore
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A technology of pyrrhotite and ore dressing methods, applied in chemical instruments and methods, flotation, wet separation, etc., can solve problems such as fluctuations and fluctuations in large-scale industrial production conditions, and achieve improved molecular arrangement, enhanced hydrophobicity and flotation speed effect
Inactive Publication Date: 2014-10-01
马钢集团设计研究院有限责任公司 +1
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Problems solved by technology
Although these methods can reduce the sulfur content to 0.25%-1.0%, fluctuations in large-scale industrial production conditions, or fluctuations in the availability of different ores, will cause fluctuations in the sulfur content of concentrates exceeding the national standard of 0.3%, and even some Up to about 2.0%
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Embodiment 1
[0047] Grinding a certain magnetite concentrate in Shandong with a sulfur content of 0.9%~1.3% to a particle size of -200 mesh (-0.075mm) accounts for 85%, dissociates the basic monomer of magnetite, and desulfurizes with the patented method of the present invention and the original method In the comparative test, the original method is to add copper sulfate as an activator and butyl xanthate as a collector in an acidic medium for flotation. The method of the present invention is to introduce butyl black drug as a mixed collector to carry out flotation under the above conditions. The total amount of collector added is the same in both methods. The dosing system list of the comparative test is as follows:
[0048] Table 1 Rough selection and dosing
[0049]
[0050] Table 2 Selected dosing
[0051]
[0052] In the final result of flotation, the original method removes the sulfur content from 0.92% to 0.36%, and the method of the present invention removes the sulfur cont...
Embodiment 2
[0054] The iron grade of a foreign ore is 54.82%, and the sulfur content is 4.37%. After magnetic separation, the iron grade is 68.54%, and the sulfur content is 0.7%. / t, butyl black drug 200g / t, 2 # Oil 20g / t was carried out for flotation to obtain a final iron concentrate grade of 69.06%, sulfur content of 0.03%, iron recovery rate of 96.67%, sulfur crude concentrate grade of 15.28%, and sulfur recovery rate of 93.27% (sulfur crude concentrate can be used for sulfuric acid plant mixed with sulfur concentrate), the beneficiation effect is quite excellent.
Embodiment 3
[0056] A certain geopyrhotite was crushed and ground to -200 mesh, accounting for 85% of the particle size, adding sulfuric acid 1000g / t, copper sulfate 200g / t, butyl xanthate 600g / t, butyl black medicine 150g / t, 2 # The oil is 30g / t for primary selection, and then for two selections, each time only 300g / t sulfuric acid is added. The final open circuit flotation results: the sulfur concentrate grade is 36.21%, and the sulfur recovery rate is 91.25%. The test results are quite good.
[0057] In Example 3, pyrrhotite was used as the target mineral for flotation.
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Abstract
The invention discloses an ore dressing method for removing pyrrhotite from iron ore. The ore dressing method for removing the pyrrhotite from the iron ore includes that performing crushing, ore grinding, grading and low intensity magnetic separation techniques to obtain low intensity magnetic concentrate, wherein the TFE grade of the low intensity magnetic concentrate is more than or equal to 65.0%, and the low intensity magnetic concentrate comprises 0.5-1.4% of S; carrying out reverse flotation roughing and reverse flotation selection on the low intensity magnetic concentrate to obtain low-pyrite concentrate with less than 0.15% of S. Weighted by the dry ore amount for the reverse flotation, the reverse flotation roughing chemical comprises (1) pH regulating agent, to be specific, 800-1200 g / t of sulfuric acid; (2) activating agent, to be specific, 80-150 g / t of copper sulfate; (3) collecting agent, to be specific, 250-400 g / t of iso-butyl xanthate and 150-250 g / t of butyl dithiophosphate; (4) foaming agent, to be specific, 30-70 g / t of 2# oil. The ore dressing method for removing the pyrrhotite from the iron ore uses the butyl dithiophosphate and butyl xanthate or iso-butyl xanthate to form sulfur content reducing chemical mixture, the molecular arrangement between the chemical micelles is improved to form a synergistic effect, the chemical is good for mineralizing and adsorbing, the hydrophobicity and the floating speed are properly reinforced, and the sulfur content of the iron concentrate is reduced to less than or equal to 0.03-0.15%. The ore dressing method for removing the pyrrhotite from the iron ore is especially suitable for removing the pyrrhotite from the iron ore with pyrrhotite through reverse flotation.
Description
technical field [0001] The invention belongs to the technical field of ore dressing, and in particular relates to a process and method for iron selection and desulfurization of sulfur-containing iron ore, and is particularly suitable for removing pyrrhotite from pyrrhotite-containing iron ore through reverse flotation. Background technique [0002] The total amount of iron ore resources in my country is abundant, but its high content of harmful impurities such as sulfur, phosphorus and silicon dioxide, and fine particle size embedded in it make ore processing difficult and low in efficiency, especially the high sulfur content in iron concentrates. Lack of competitiveness in the international market. In recent years, a large number of high-quality iron ore imports have caused a serious impact on the sustainable development of my country's iron mines. Reducing the sulfur content of iron concentrates has become an urgent scientific research task. The development and utilization ...
Claims
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