Manganese and iron separation and recovery method of manganese-poor iron ore

A separation and recovery, manganese-poor technology, applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve the problems of poor adjustment of reduction conditions, long roasting time, etc., to reduce acid consumption, fast reaction speed, reduce acid consumption effect

Inactive Publication Date: 2018-10-19
湖南长拓高科冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a method for separating and recovering manganese and iron from manganese-poor iron ore to solve technical problems such as long roasting time and poor adjustability of reduction conditions during the separation and recovery of manganese and iron from manganese-depleted iron ore

Method used

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  • Manganese and iron separation and recovery method of manganese-poor iron ore
  • Manganese and iron separation and recovery method of manganese-poor iron ore

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Experimental program
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Effect test

Embodiment 1

[0067] refer to figure 2 , in the manganese-poor iron ore processed, the grade of manganese is 19%, and the grade of total iron is 35%. The above-mentioned manganese-poor iron ore is dried and ground in an air-swept ball mill until the particle size is -200 mesh, accounting for 75%. The above-mentioned dried and ground mineral powder enters the four-stage cyclone preheater for preheating. The preheating uses the roasting tail gas after the suspension flash magnetization roasting as the preheating gas. The gas temperature after the first stage preheating is 250°C. The gas temperature after the second stage preheating is 400°C, the gas temperature after the third stage preheating is 550°C, and the gas temperature after the fourth stage preheating is 650°C; the fourth stage preheating time is 10s. The volume percent content of CO in the preheated tail gas produced after four-stage preheating is 0.1%, O 2Volume percentage 3 , the residence time in the furnace is 10s, after the r...

Embodiment 2

[0075] refer to figure 2 , in the processed manganese iron ore, the grade of manganese is 13%, and the grade of total iron is 45%. The above manganese iron ore is dried and ground in an air-swept ball mill until the particle size is -200 mesh, accounting for 80%. The above-mentioned dried and ground fine ore enters the three-stage cyclone preheater for preheating. The preheating uses the roasting tail gas after the suspension flash magnetization roasting as the preheating gas. The gas temperature after the first stage preheating is 350°C. The gas temperature after the second stage preheating is 550°C, and the gas temperature after the third stage preheating is 650°C; the third stage preheating time is 50s. The volume percentage of CO in the preheated tail gas produced after the three-stage preheating is 1%, O 2 Volume percentage 3 , the residence time in the furnace is 25s. After the reaction is completed, gas-solid separation is carried out to obtain a temperature of 750 ° ...

Embodiment 3

[0083] refer to figure 2 , a poor manganese iron ore in southern Hunan, in which the grade of manganese is 11.89%, and the grade of total iron is 41.51%. The dried and ground mineral powder is preheated by the primary or secondary cyclone preheater. The preheating adopts the suspension type gas-solid reduction roasting exhaust gas, and the preheating time is 30s; the preheating exhaust gas after preheating The volume percentage of CO is 0.6%; the preheated ore powder enters the suspension flash magnetization roasting furnace for gas-solid reduction roasting, and the weak reducing gas with a CO volume percentage of 3.6% is continuously fed into the furnace and Maintain the temperature in the furnace at 650°C, and control the solid-gas ratio of manganese iron ore and weakly reducing gas in the furnace to 0.55Kg / Nm 3 , the residence time in the furnace is 20s, after the reaction is completed, the gas-solid separation is carried out, and the temperature is 600 ℃, manganese and i...

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Abstract

The invention provides a separation and recovery method of manganese and iron in a poor ferrous manganese ore. The method comprises the following steps: the poor ferrous manganese ore is preheated to feed in a suspension type flash magnetization roasting furnace for gas-solid reducing roasting; weak reductive gas is continuously fed in the furnace; the in-furnace temperature is 650-800 DEG C; the stop time is 10-25 s; a roasting ore and roasting tail gas with manganese and iron existing as MnO and Fe3O4 are obtained by gas-solid separation; the solid-gas ratio of the poor ferrous manganese ore and the weak reductive gas is 0.35-0.7 Kg / Nm3; the volume percentage content of CO in the weak reductive gas is 2.5-4.5%; and the roasting ore is cooled to perform the first magnetic separation to obtain an iron concentrate and a first magnetic separation tailing. The preheating and the suspension type gas-solid reducing roasting are performed for the poor ferrous manganese ore; the roasting ore is cooled to perform the first magnetic separation and the second magnetic separation; and the poor ferrous manganese ore is separated to recover manganese and iron to obtain a manganese middling and an iron concentrate.

Description

technical field [0001] The invention relates to the field of ferromanganese ore separation, in particular to a method for separating and recovering manganese and iron from manganese-poor ferromanganese ore. Background technique [0002] The distribution of manganese ore resources in the world is uneven, and most of them are distributed in South Africa and a few countries in the Commonwealth of Independent States. There is almost no manganese-rich ore in my country, and the relatively high-grade manganese ore resources are gradually being developed and utilized. Therefore, the development and utilization of low-grade manganese-poor ore is imminent. Poor manganese ore is generally associated with iron to form manganese-poor iron ore, such as the poor manganese ore in southern Hunan. Ferromanganese ore has a reserve of 200 million tons. This type of ore is easy to mine and difficult to separate, and ferromanganese is not easy to separate, so it has not been effectively utilized ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B47/00B03C1/30
Inventor 庄大英高泽斌李永恒彭洋
Owner 湖南长拓高科冶金有限公司
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