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Low-cost method for preparing molybdenum silicide without sulfur-containing gas emission

A gas emission, molybdenum silicide technology, applied in the direction of metal silicide, can solve the problems of environmental pollution, difficult, difficult gas collection, etc., to shorten the production process, avoid the roasting process, and shorten the production process.

Active Publication Date: 2021-07-09
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SiS and SiS 2 The gas is difficult to collect, and after being released into the air, it will undergo hydrolysis reaction to form H 2 S gas causes environmental pollution, so it is difficult to be applied to the industrial preparation of MoSi 2

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Molybdenum concentrate (MOS) 2 The mass fraction is 95%) and Si powder according to actual MOS 2 The content of the content and Si is 1: 2.33 ingredients and mix well and press molded as the inner sample, and then covered with the outer sample of the inner sample (with a desulfurizer lime, the inner layer sample) 1 layer desulfurizer, desulfurizer lime Corresponding to MOS in molybdenum concentrate 2 The molar ratio of the CaO content in lime was 1: 4, and the inert atmosphere at 1100 ° C was 0.5 hours. Cool to room temperature, peel off the exterior desulfurizer layer, to obtain MO 3 Si. XRD analysis of the samples of the peeled outer substance different positions showed that the main phase of the phase of the inner layer sample is CAS, which indicates that the lime in the present invention can use the sulfur element in the molybdenum concentrate in the form of CAS. Fixed; in addition, only CaO in the outermost layer of the outer sample, so that the sulfur elements of the ...

Embodiment 2

[0025] Molybdenum sulfide and high purity Si powder according to actual MOS 2 The content of the content and C is 1: 4 ingredients and mixed uniform and pressed into the inner sample, and then a layer of desulfurizing agent is covered with a layer of desulfurizer in the outside of the inner sample, and the amount of the desulfurizer lime corresponds to MOS MOS in MOS 2 The molar ratio of the CaO content with the lime was 1: 3, and the inert atmosphere of 1200 ° C was reacted for 10 hours. Remove the outer layer desulfurizer layer after cooling to room temperature to give pure MOSI 2 . Further, XRD analysis is performed on the outer surface of the external desulfurization layer, and only CaO is detected, which indicates that there is no sulfur gas during the reaction.

Embodiment 3

[0027] Molybdenum concentrate (MOS) 2 The mass fraction is 95%) and Si powder according to actual MOS 2 The content of the content and Si is 1: 2.6 ingredients and mix well and press molded as the inner sample, and then coated a layer of desulfurizing agent in the outside of the inner sample, and the amount of the desulfurizer lime corresponds to MOS in molybdenum precision. 2 The molar ratio of the CaO content with the lime was 1: 4, and the inert atmosphere of 1300 ° C for 5 hours. Cool to room temperature, peel off the exterior desulfurizer layer, to obtain MO 5 Si 3 . Further, XRD analysis is performed on the outer surface of the external desulfurization layer, and only CaO is detected, which indicates that there is no sulfur gas during the reaction.

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PUM

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Abstract

The invention discloses a low-cost method for preparing molybdenum silicide without sulfur-containing gas emission. Molybdenum silicide is prepared by directly using substances taking MoS2 as a main component, such as molybdenum concentrate as a molybdenum source, a substance taking Si as a main component as a reducing agent and lime as a sulfur-fixing agent in one step under the condition of high-temperature inert atmosphere. In the reaction process, S in MoS2 is completely captured by desulfurizer lime and exists in an external desulfurization layer in the form of CaS, and the desulfurization layer and internal molybdenum silicide (MoSi2, Mo5Si3 or Mo3Si) can be separated through simple stripping operation. The molybdenum concentrate can be directly used as the molybdenum source, the roasting process of the molybdenum concentrate is avoided, and the molybdenum source production process is greatly shortened. Lime is used as a desulfurizing agent, the sulfur element in the molybdenum concentrate can be prevented from being discharged into the atmosphere in the form of sulfur-containing gas when the molybdenum concentrate is used as a molybdenum source, a desulfurization layer and an inner layer product can be simply crushed and separated after the reaction is completed, and the method is suitable for large-scale industrial production.

Description

Technical field [0001] The present invention belongs to the field of material preparation, and a method of preparing a silicide material is disclosed. Background technique [0002] Silicon and molybdenum can generate Mo under different conditions 3 Si, Mo 5 Si 3 Mosi 2 Three intermetallic compounds, currently only MOSI 2 Have a wide range of applications. Mosi 2 Antioxidant properties under high temperature conditions are mainly used as heat generating components and high temperature structural materials of industrial furnaces. Compared to MOSI 2 , Mo 5 Si 3 And Mo 3 Si has higher melting points and better anti-high temperature creep properties, but high temperature antioxidation is poor. In addition, Mo 3 Si has the highest Mo content in three compounds (about 91%), MO 5 Si 3 The Mo content is 79.7%, and the molybdenum content of the two is higher than the molybdenum iron in conventional molybdenum additives, so it is desirable to be used as a molybdenum additive for smelting mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/06
CPCC01B33/06
Inventor 张国华常贺强
Owner UNIV OF SCI & TECH BEIJING
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