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Method for dephosphorizing phosphorus-containing hematite and preparing iron ore concentrate by using phosphorus-containing hematite

A technology for hematite and iron concentrate, which is applied in the field of ferrous metal beneficiation, can solve the problem that iron ore has not been industrially applied, and achieve the effects of facilitating equipment fabrication and maintenance, reducing production costs and saving investment.

Inactive Publication Date: 2013-07-03
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to economic and technical reasons, this type of iron ore has not been used in industry

Method used

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  • Method for dephosphorizing phosphorus-containing hematite and preparing iron ore concentrate by using phosphorus-containing hematite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Get 1 kg of phosphorus-containing hematite powder (crushed to 100 mesh) and mix it with 200 g of rice straw powder crushed to 10 mesh, then mix evenly with 10 g of dephosphorization additive (ammonium sulfate is selected as the dephosphorization additive), and place the uniformly mixed material in the reaction In the furnace, it was roasted at 400°C for 2 hours. After roasting, it was cooled to below 80°C. The obtained calcine was separated by wet magnetic separation to obtain iron concentrate with a grade of 61%, and the recovery rate was 72%. Phosphorus in iron concentrate The content is 0.15%.

Embodiment 2

[0025] Get 1 kg of phosphorus-containing hematite powder (crushed to 100 mesh) and mix with 100 g of wheat straw crushed to 10 mesh and 100 g of cornstalk crushed to 10 mesh, then mix evenly with 10 g of sulfuric acid (dephosphorization additive), and place the uniformly mixed material in In the reaction furnace, it was roasted at 550°C for 1 hour. After roasting, it was cooled to below 80°C. The obtained calcine was separated by wet magnetic separation to obtain iron concentrate with a grade of 62%, and the recovery rate was 75%. The phosphorus content is 0.10%.

Embodiment 3

[0027] Get 1 kg of phosphorus-containing hematite powder (crushed to 100 mesh) and mix it with 100 g of sawdust crushed to 20 mesh and 100 g of corn stalks crushed to 20 mesh, then mix with 10 g of hydrochloric acid (dephosphorization additive), and mix the homogeneous material Put it in a reaction furnace and roast at 550°C for 1 hour. After roasting, cool to below 80°C. The obtained calcine is separated by wet magnetic separation to obtain iron concentrate with a grade of 65% and a recovery rate of 85%. The phosphorus content in iron concentrate is 0.10%.

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Abstract

The invention discloses a method for dephosphorizing phosphorus-containing hematite and preparing iron ore concentrates by using the phosphorus-containing hematite, belonging to the technical field of iron ore concentrate preparation. The invention realizes a method of low-temperature (400-600 DEG C) reduction magnetization and dephosphorization by adopting biomasses and adding dephosphorizing additives and the iron ore concentrates are obtained by carrying out magnetic separation on magnetized and dephosphorized minerals. The method has low production cost; the grades of obtained iron ores reach more than 60 percent; and the content of phosphorus contained in the iron ore concentrates is lower than 0.2 percent. Compared with the traditional process realizing magnetic transformation by taking coal as a reducing agent, the invention reduces the temperature of the magnetic transformation from original 800 DEG C to below 600 DEG C and can reduce the temperature of the magnetic transformation about 200 DEG C, thereby not only reducing the energy consumption, but also solving the problem that the magnetized minerals can not separate iron from silicates because quartz-containing components in the iron ores are softened at higher temperature; and in addition, the method has the advantages of convenience for equipment manufacture and maintenance and investment saving and also achievesthe purposes of saving energy and reducing production cost.

Description

technical field [0001] The invention belongs to the technical field of ferrous metal beneficiation, in particular to a method for dephosphorizing hematite containing phosphorus and preparing iron concentrate. Background technique [0002] By the end of 2007, the total amount of proven iron ore resources in China was 60.7 billion tons, and the estimated unidentified resources were more than 100 billion tons. Among them, the economically recoverable reserves are 11.29 billion t, accounting for 19% of the total and only about 7.1% of the world's reserves. The characteristics of my country's iron ore resources are that there are many small and medium-sized mines and few large mines; there are many associated ores and the difficulty of dressing and smelting is high. Among the identified iron ore resources, iron ores that are difficult to dress and smelt account for 1 / 5, and the development and utilization costs are high. . The most important type of iron ore is high-phosphorus i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B5/08
Inventor 朱国才
Owner TSINGHUA UNIV
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