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Additive and method for reinforcing separation of manganese and iron through magnetic roasting-magnetic separation of high-iron manganese oxide ore

A technology of magnetizing roasting and oxidizing manganese ore, which is applied in the fields of chemical industry and metallurgy to achieve the effect of promoting the separation of iron and manganese, high recovery rate of iron and manganese, and simple process flow

Active Publication Date: 2014-04-23
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

When the magnetic separation of the magnetized roasted product is carried out first, since the close intercalation relationship of iron and manganese oxides has not been significantly damaged during the roasting process, the separation effect of iron and manganese is not good; if the magnetized roasted product is acid-dissolved first, it will make More iron enters the solution, making it difficult to purify and remove impurities
Therefore, the method of first iron and then manganese or first manganese and then iron can realize the separation of iron and manganese to a certain extent, but there are situations where the separation of iron and manganese is not complete or the recovery rate of manganese is low, especially when iron and manganese are separated by the same type and quality. When the form exists, the separation of iron and manganese is more difficult

Method used

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  • Additive and method for reinforcing separation of manganese and iron through magnetic roasting-magnetic separation of high-iron manganese oxide ore
  • Additive and method for reinforcing separation of manganese and iron through magnetic roasting-magnetic separation of high-iron manganese oxide ore

Examples

Experimental program
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Effect test

Embodiment 1

[0043] First, crush and grind high iron manganese ore (TFe 27.56%, TMn 31.82%) to -0.074mm, accounting for 95%; then add additives to the finely ground manganese ore powder (according to the mass percentage, the additive consists of 70% manganese dithionate , 20% sodium sulfite, and 10% sodium humate), the molar ratio of S / Mn is 1.2:1; after mixing, pelletizing and drying in sequence, the CO / (CO+CO 2 ) = 18% mixed gas as the reducing medium, the dry mass was reduced at a temperature of 800°C for 20 minutes, the reduced product was crushed and ground to -0.074mm to account for 80%, and magnetic separation was performed with a magnetic field strength of 1100Gs. The iron grade in the obtained concentrate is 60.82%, the manganese grade is 6.2%, and the iron recovery rate is 82.5%. The manganese leaching rate was 86.6%.

Embodiment 2

[0045]First, crush and grind the high-iron manganese ore (same as above) to -0.074mm, accounting for 95%; then add additives to the finely ground manganese ore powder (according to the mass percentage content, the additive consists of 64% manganese dithionite, 23% sodium sulfite, 13 % sodium humate mixture), the S / Mn molar ratio is 1.12:1; after mixing, pelletizing and drying in sequence, the CO / (CO+CO 2 ) = 30% mixed gas as the reducing medium, the dry mass was reduced at 680°C for 55 minutes, the reduced product was crushed and ground to -0.074mm to account for 80%, and magnetic separation was performed with a magnetic field strength of 1100Gs. The iron grade in the obtained concentrate is 61.2%, the manganese grade is 5.9%, and the iron recovery rate is 86.1%. The manganese leaching rate was 88.2%.

Embodiment 3

[0047] First, crush and grind the high-iron manganese ore (same as above) to -0.074mm, accounting for 95%; then add additives to the finely ground manganese ore powder (according to the mass percentage content, the additive consists of 60% manganese dithionite, 25% sodium sulfite, 15% % sodium humate mixture), the S / Mn molar ratio is 1.05:1; after mixing, pelletizing and drying in sequence, the CO / (CO+CO 2 ) = 40% mixed gas as the reducing medium, the dry mass was reduced at a temperature of 500°C for 120 minutes, the reduced product was crushed and ground to -0.074mm to account for 80%, and magnetic separation was performed with a magnetic field strength of 1100Gs. The iron grade in the obtained concentrate is 60.1%, the manganese grade is 6.9%, and the iron recovery rate is 80.6%. The manganese leaching rate was 85.2%.

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Abstract

The invention discloses an additive and a method for reinforcing separation of manganese and iron through magnetic roasting-magnetic separation of a high-iron manganese oxide ore. The additive consists of dithionic acid manganese, sodium sulfite and sodium humate by a certain mass ratio; the method comprises the following steps: after being evenly mixed with the additive, a high-iron manganese ore crushed and grinded to a certain particle size is sequentially agglomerated, dried, reduced and roasted; crushing, ore grinding, magnetic separation and solid-liquid separation are conducted on the roasted product after the roasted product is cooled; then magnetite powder, manganese sulfate-enriched filtrate and nonmagnetic residues are obtained. The additive and the method are adopted to reduce and convert iron oxide to the magnetite powder as blast furnace ironmaking raw materials; manganese oxide is reduced and converted to manganese sulfate, is introduced in the filtrate after the ore grinding, the magnetic separation and the solid-liquid separation, and can be used as raw materials for producing the manganese sulfate and electrolytic manganese after being purified and decontaminated. The additive and the method overcome the defect of incomplete separation of the manganese and iron in the conventional high-iron manganese ore treatment methods, and have such characteristics as high iron and manganese separation efficiency, simple process flow and low cost.

Description

technical field [0001] The invention belongs to the fields of metallurgy, chemical industry and the like, and relates to an additive and a method for reducing and separating iron and manganese from ferromanganese ore. Background technique [0002] With the rapid development of the iron and steel industry, the demand for iron-containing resources continues to increase. Due to the high iron content in high-iron manganese ore, the comprehensive utilization of iron elements in it can be used as part of the raw materials for iron and steel production. At the same time, manganese is an important metal element, which is mainly used in the iron and steel industry. , Deoxidizer, manganese can strengthen ferrite and refine pearlite, so it can improve the strength of steel and can be used as an alloy element of steel. The use of manganese has been paid more and more attention by people. [0003] Manganese ore resources are mainly divided into manganese oxide ore, manganese carbonate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02B03C1/015
Inventor 张元波姜涛李光辉范晓慧赵熠游志雄黄柱成郭宇峰杨永斌李骞陈许玲苏子键刘兵兵周友连罗伟张永建陈军孙阳
Owner CENT SOUTH UNIV
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