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Preparation method of manganese nitride

A technology of manganese nitride and nitriding temperature, which is applied in the field of iron and steel metallurgy, can solve the problems of low nitrogen content and low efficiency, and achieve the effects of high nitriding rate, compressed process time, and high nitrogen utilization rate

Active Publication Date: 2015-04-08
湖南源创高科工业技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a method for preparing manganese nitride, so as to solve the problems of low efficiency and low nitrogen content in the preparation of manganese nitride in the prior art

Method used

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  • Preparation method of manganese nitride

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Embodiment 1

[0047] Embodiment one, see figure 1

[0048] A preparation method for manganese nitride, comprising the following steps:

[0049] a. Preheating: Preheat the manganese-containing raw material with a maximum particle size of 0.3mm through a preheater. After preheating, the temperature of the manganese-containing raw material is 400-750°C; In the high-temperature air flow, it is in a suspended fluidized state in a weakly reducing nitrogen atmosphere; the temperature of the high-temperature air flow is 450-800°C.

[0050] When the fine-grained manganese-containing raw material enters the preheater, it encounters the opposite high-temperature airflow of 450-650°C, and is immediately dispersed by the airflow until it is heated in a suspended fluidized state, so that the temperature of the manganese-containing raw material is rapidly raised to 400-750°C .

[0051] The preheating process is not only a process of raising the temperature of manganese-containing raw materials, but als...

Embodiment 2

[0067] Embodiment two, see figure 1

[0068] Metal manganese powder with a particle size of less than 0.3mm, in which the manganese content is 99.2% and the oxygen content is 0.3%, passes through the raw material bin 4 through the first-stage preheater 5, the second-stage preheater 6, and the third-stage preheater 7 in sequence Preheating. During the preheating process, the manganese-containing raw materials are in a suspended fluidized state, and exchange heat with the high-temperature gas that passes through the third-stage preheater 7, the second-stage preheater 6, and the first-stage preheater 5 in reverse. , while performing pre-nitridation, the high-temperature gas comes from the tail gas discharged from the reactor 10.

[0069] The temperature in the first-stage preheater 5 is controlled at 400°C-450°C, the temperature in the second-stage preheater 6 is 550-600°C, and the temperature in the third-stage preheater 7 is 680-720°C. The temperature of the metal manganese p...

Embodiment 3

[0080] Manganese-containing raw materials (a mixture of electrolytic manganese powder and ferromanganese powder) with a particle size of less than 0.3mm, in which the manganese content is 65% and the oxygen content is 0.8%, are passed through the raw material bin 4 in turn through the first-stage preheater 5 and the second-stage preheater The manganese-containing raw material is in a suspended fluidized state during the preheating process, and performs countercurrent heat exchange with the high-temperature gas passing through the second-stage preheater 6 and the first-stage preheater 5 in reverse, and pre-nitrogen The high-temperature gas is derived from the tail gas discharged from the reactor 10.

[0081]The temperature in the first-stage preheater 5 is controlled at 450°C-500°C, the temperature in the second-stage preheater 6 is 550-600°C, and the temperature of the manganese-containing raw material after preheating is 500-550°C. The preheating process is 40-45 seconds.

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Abstract

The invention provides a preparation method of manganese nitride. The preparation method comprises the following steps of a, pre-heating a manganese-containing raw material having the maximal particle size of 0.3mm by a pre-heater, wherein a temperature of the pre-heated manganese raw material is in a range of 400-750 DEG C, and in a high-temperature gas flow opposite with a manganese-containing raw material feeding direction in the pre-heater, the manganese-containing raw material is in a suspension flow state in the weakly-reductive nitrogen atmosphere, b, feeding the manganese-containing raw material into a reactor, and carrying out nitridation under the condition of a solid-gas ratio of the manganese-containing raw material to the fed gas of 0.7-1.2kg / Nm<3> to obtain high-temperature manganese nitride, wherein the manganese-containing raw material is in a suspension flow state in the weakly-reductive nitrogen atmosphere, and c, separating the nitrided manganese-containing powder by a cyclone separator, carrying out cooling to a temperature below 120 DEG C by a solid cooler isolating air and then carrying out discharging. The novel preparation method of manganese nitride realizes nitridation of the manganese-containing raw material in very short time and has the advantages of high nitrogen utilization rate, high production efficiency and high product quality.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a preparation method of manganese nitride. Background technique [0002] The element manganese plays a role in deoxidation, desulfurization and alloying in steelmaking. The presence of manganese can eliminate or weaken the thermal embrittlement caused by sulfur, thereby improving the hot workability of steel; The hardness and strength of ferrite and austenite. Therefore, with the development of manganese resources, the development of steelmaking technology and the increase of special needs, the series of master alloys containing manganese have also been greatly promoted. [0003] Elemental nitrogen can interact with other elements in the steel to endow the steel with many excellent properties, such as good strength and toughness, high creep resistance and good corrosion resistance. Nitrogen was originally used in austenite as an austenitic element instead of nickel to s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/06
Inventor 骆志炜
Owner 湖南源创高科工业技术有限公司