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Method for decreasing phosphorus of high-phosphorus iron ore by adopting microwave reduction-magnetic separation

A high-phosphorus iron ore and microwave technology, which is applied in the field of high-phosphorus iron ore reduction and phosphorus reduction, can solve the problems of slow dephosphorization speed, low iron recovery rate and dephosphorization rate of high-phosphorus iron ore, and achieve the carbon thermal reduction time short, low reduction temperature, and increased iron recovery

Inactive Publication Date: 2012-03-21
UNIV OF SCI & TECH LIAONING
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Problems solved by technology

[0004] The invention provides a method for reducing phosphorus by microwave-magnetic separation of high phosphorus iron ore, which solves the problems of slow dephosphorization speed, low iron recovery rate and low dephosphorization rate of high phosphorus iron ore

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  • Method for decreasing phosphorus of high-phosphorus iron ore by adopting microwave reduction-magnetic separation
  • Method for decreasing phosphorus of high-phosphorus iron ore by adopting microwave reduction-magnetic separation

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Embodiment Construction

[0016] The present invention will be specifically described below by taking a laboratory small-scale test as an example.

[0017] Take high phosphorus iron ore powder and slaked lime, the chemical composition of high phosphorus iron ore and slaked lime is shown in Table 1; the reducing agent is coal powder, and the composition of coal powder is shown in Table 2; the reduction microwave oven uses KH-6HMOA industrial microwave oven.

[0018] Table 1 Ferrophosphorite and slaked lime chemical composition (%)

[0019]

[0020] Table 2 Industrial analysis of pulverized coal composition (%)

[0021]

[0022] Implementation steps:

[0023] (1) Use a ball mill to finely grind coal powder and high-phosphorus iron ore powder into 90 mesh to 1mm.

[0024] (2) Weigh 82.5g of the above-mentioned high-phosphorus iron ore powder, 15.2g of coal powder, and 2.28g of slaked lime and mix them well, and spread the coal powder on the top layer to prevent the sample from being oxidized when ...

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Abstract

The invention discloses a method for decreasing phosphorus of high-phosphorus iron ore by adopting microwave reduction-magnetic separation, solving the problems that the dephosphorizing speed of the high-phosphorus iron ore is low, and the iron recovery rate and the dephosphorizing rate are low. The method is characterized by comprising the following steps: material smashing, blending, microwave reduction, sponge iron smashing, magnetic separation and post-treatment. Compared with the existing dephosphorizing method for the high-phosphorus iron ore, the method in the invention has the following benefits: high-phosphorus iron ore carbon heat reduction reaction is conducted faster and more thoroughly, the embedded structure of apatite is damaged, and the dephosphorizing rate and the iron recovery rate are improved by magnetic separation. By magnetic separation, low-phosphorus iron powder containing 0.2-0.3 percent of phosphorus can be obtained, and the dephosphorizing rate and the iron recovery rate can be more than 85 percent; and the carbon heat reduction time is short, the reduction temperature is lower than that in normal heating, the energy is saved, and the pollution is less.

Description

technical field [0001] The invention relates to a method for reducing and reducing phosphorus of high phosphorus iron ore, in particular to a method for reducing phosphorus of high phosphorus iron ore by microwave-magnetic separation. Background technique [0002] To solve the shortage of iron ore resources, we must focus on the utilization of low-grade, compound paragenetic ore resources, which is also the fundamental way to solve the safe and stable supply of iron ore resources. For example, "Ningxiang-style" high-phosphorus oolitic hematite is an important type of iron ore, but since the phosphorus in iron ore mainly exists in the form of collophosite, apatite or fluoroapatite, it is disseminated in the oxidation of iron ore. The edges of the grains are embedded in quartz or carbonate minerals, and a small amount exists in the lattice of iron minerals. In addition, apatite crystals are mainly columnar, needle-like, aggregated or scattered in iron minerals and gangue mine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00
CPCY02P10/20
Inventor 金永龙张辉何志军
Owner UNIV OF SCI & TECH LIAONING
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