A kind of combined ferromanganese production method using pyrite to strengthen the reduction of pyrolusite

A joint production and pyrolusite technology, which is applied in the field of metallurgy and mineral processing, can solve the problems of large dust content, low concentration of tail gas reducing agent, and difficult industrial practice, etc., and achieves low price, thorough reaction, and low difficulty in impurity removal Effect

Active Publication Date: 2022-03-08
CHANGSHA RES INST OF MINING & METALLURGY
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Problems solved by technology

This manganese ore reduction method adopts high concentration rich CO, H 2 There are potential safety hazards such as explosion and poisoning for the reduction of roasted ore with coal gas, and the tail gas produced after reduction has a low concentration of reducing agent and a large dust content. The industrial practice of tail gas combustion with low calorific value and high dust content is very difficult.

Method used

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  • A kind of combined ferromanganese production method using pyrite to strengthen the reduction of pyrolusite
  • A kind of combined ferromanganese production method using pyrite to strengthen the reduction of pyrolusite

Examples

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Effect test

Embodiment 1

[0032] Such as figure 1 Shown, a kind of ferromanganese combined production method utilizing pyrite to strengthen pyrolusite reduction comprises the following steps:

[0033] (1) Crush coal and pyrite (compositions are shown in Table 1 and Table 2 below) and mix them uniformly at a mass ratio of 80:20, then add them to the gasifier for roasting to obtain SO-containing 2 、H 2 , CO high-temperature mixed flue gas, SO in high-temperature mixed flue gas 2 、H 2 and CO concentrations are about 3%, 4% and 8% respectively; collect slag to obtain magnetite, and magnetite is subjected to magnetic separation to obtain iron concentrate;

[0034] (2) First, use a weak magnetic machine to carry out a weak magnetic separation on the cooled magnetite to obtain a weak magnetic coarse concentrate and a weak magnetic tailing. After a weak magnetic coarse concentrate is demagnetized, it enters the grinding and classification operation. The tailings of the first stage of weak magnetic tailings...

Embodiment 2

[0048] The coal powder, pyrite and pyrolusite used in this example are the same as in Example 1, the difference is that the coal powder and pyrite are crushed and mixed evenly according to the mass ratio of 90:10, and then added to the gasifier After internal calcination, the SO-containing 2 、H 2 , CO high-temperature mixed flue gas, SO in high-temperature mixed flue gas 2 、H 2 and CO concentrations were about 2.2%, 5.3% and 10.7%, respectively. After the same process as in Example 1, the temperature of the exhaust gas is about 180°C.

[0049] In this example, the grade of the finally obtained iron ore concentrate is 66.41%, the iron recovery rate is 91.42%, the Mn content of the electrolytic manganese product is ≥ 99.8%, and the product quality meets the national DJMn D-level quality requirements.

Embodiment 3

[0051] The coal powder, pyrite and pyrolusite used in this example are the same as in Example 1, the difference is that after the pulverized coal and pyrite are crushed, they are mixed evenly in a mass ratio of 80:20, and 10% of coal quality is added. % sulfur powder, after roasting in the gasifier, get SO 2 、H 2 , CO high-temperature mixed flue gas, SO in high-temperature mixed flue gas 2 、H 2 and CO concentrations are about 3.2%, 4.5% and 9.9%, respectively. After the same process as in Example 1, the temperature of the exhaust gas is about 160°C.

[0052] In this example, the iron ore concentrate grade finally obtained is 66.55%, the iron recovery rate is 91.98%, the yield of manganese sulfate is higher than that of Example 1-2, the Mn content of the electrolytic manganese product is ≥ 99.8%, and the product quality reaches the national DJMn D-level quality requirements.

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Abstract

The invention discloses a combined production method of ferromanganese using pyrolusite to strengthen the reduction of pyrolusite, which comprises the following steps: (1) crushing coal and pyrite ore, mixing them evenly, and then adding them to a gas generator for roasting to obtain SO2-containing manganese 2 、H 2 , CO high-temperature mixed flue gas and slag; collect slag to obtain magnetite, and magnetite obtains iron ore concentrate through magnetic separation; (2) pyrolusite is crushed and milled to obtain pyrolusite ore powder, which is obtained in step (1) The high-temperature mixed flue gas is blown into the fluidized reduction furnace, and at the same time, the pyrolusite ore powder is added to the fluidized reaction furnace, and the pyrolusite ore powder undergoes a fluidization reaction to obtain pyrolusite roasted ore. In the present invention, the method of using cheap pyrite to strengthen the pyrolusite reduction process and realize the combined production of ferromanganese has important practical significance for the sustainable, green and healthy development of the electrolytic manganese industry.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and mineral processing, and in particular relates to a multi-mineral joint production method. Background technique [0002] my country's manganese ore resource endowment is poor, and the characteristics of "poor, fine, miscellaneous, and scattered" are obvious. The average grade of manganese ore is only 22%, which is less than half of the world's average manganese grade. The reserves of rich manganese ore only account for 6.71% of the total reserves. Manganese and its compounds play an important role in the development of the national economy and are widely used in various fields of the national economy. Among them, the consumption in the iron and steel field accounts for about 90%-95% of the total consumption, and the remaining 5%-10% is used in the chemical industry, Other fields such as electronics industry and environmental protection. The rapid development of the manganese industry has ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/14C22B1/02C22B3/06C22B47/00
CPCC21B13/0066C21B13/006C21B13/14C22B1/02C22B3/06C22B47/00Y02P10/20
Inventor 陈雯刘小银李家林严小虎陆晓苏彭泽友廖振鸿
Owner CHANGSHA RES INST OF MINING & METALLURGY
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