Oxynitride-Based Vanadium-Nitrogen Alloy Production with Lower Carbon Use
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Solution Overview
Problem
Existing vanadium-nitrogen alloy production methods face issues such as high carbon content, high reaction temperatures, and high energy consumption, which are not aligned with the need for reduced carbon emissions and optimized production indexes.
Innovation Solution
A method using vanadium oxynitride as a raw material, with a rotary kiln design that prolongs gas contact time and reduces carbonaceous reductant dosage, coupled with a gas recycling system to enhance efficiency and reduce emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first generation vacuum method is used to prepare vanadium-nitrogen alloy, then the alloy can be produced, but the process becomes discontinuous with complex equipment, large investment, long production cycle, low productivity and high energy consumption
Solution Approach 1:
The preparation process is divided into multiple sequential steps: thermal deamination in a first rotary kiln, thermal reduction in a second rotary kiln, and carbothermal reduction-nitridation in a third rotary kiln. This segmentation allows each step to be optimized independently while maintaining continuous operation, resolving the contradiction between production quality and efficiency
Solution Approach 2:
Vanadium oxynitride is prepared in advance through thermal deamination and thermal reduction processes before the final carbothermal reduction-nitridation step. This preliminary preparation of the raw material with controlled oxygen content (4%-20%) ensures better reaction efficiency and reduces the carbonaceous reductant dosage, thereby improving productivity while maintaining alloy quality
2Productivity
If the second generation atmospheric pressure one-step method is used, then continuous production is achieved, but the carbon content becomes high and reaction temperature increases
Solution Approach 1:
The oxygen content of vanadium oxynitride is precisely controlled within 4%-20% through thermal reduction parameters adjustment. This parameter optimization reduces the carbonaceous reductant dosage by 10%-30%, directly lowering carbon emission while maintaining continuous production capability through the multi-kiln atmospheric pressure process
Solution Approach 2:
Different rotary kilns are designed with specific functions: the first rotary kiln for thermal deamination, the second for thermal reduction to control oxygen content, and the third for carbothermal reduction-nitridation. This localized quality control at each stage optimizes the overall process to reduce carbon content while maintaining continuous operation
3Temperature
If high reaction temperature is used in the second generation method, then the reduction reaction proceeds, but energy consumption increases and carbon emission rises
Solution Approach 1:
Thermal deamination and thermal reduction are performed in advance in the first and second rotary kilns to prepare vanadium oxynitride with optimized oxygen content. This preliminary action reduces the energy barrier for the final carbothermal reduction-nitridation reaction, allowing it to proceed at lower temperatures and thus reducing energy consumption
Solution Approach 2:
By controlling the oxygen content parameter of vanadium oxynitride within 4%-20%, the reaction conditions for carbothermal reduction-nitridation are optimized. This parameter change reduces the required reaction temperature and carbonaceous reductant dosage, thereby lowering energy consumption while maintaining effective alloy production
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method achieves low-carbon and efficient production of vanadium-nitrogen alloy by minimizing carbon usage, reducing reaction temperatures, and optimizing production time, thereby improving the overall process efficiency and environmental impact.
Implementation Method 1
adding ammonium vanadate into a first rotary kiln for thermal deamination to obtain a thermal vanadium oxide and a mixed gas 1
Implementation Method 2
adding the thermal vanadium oxide into a second rotary kiln for thermal reduction in a first protective atmosphere to obtain a vanadium oxynitride and a mixed gas 2
Implementation Method 3
sending the dried raw material block into a calcining kiln for carbothermal reduction and nitridation in a second protective atmosphere to obtain a vanadium-nitrogen alloy and a mixed gas 3
Data Source
AI summary
The invention discloses a preparation method for a vanadium-nitrogen alloy, which comprises the following steps: a, adding ammonium vanadate into a first rotary kiln for heating and deamination to obtain a thermal vanadium oxide and a mixed gas 1; b, adding the thermal vanadium oxide into a second rotary kiln, for heating and reducing in a first protective atmosphere to obtain a vanadium oxynitride and a mixed gas 2; c, mixing a graphite powder and the vanadium oxynitride in a ratio of K:1 by mass percentage to form a mixture, and mixing and molding the mixture to obtain a dried raw meal block, wherein the vanadium oxynitride has an oxygen content of 4%-20%, and the oxygen content is divided into n intervals, and the K value is in direct proportion to the oxygen content in each interval; and d, sending the dried raw material block into a calcining kiln for carbothermal reduction and nitridation in a second protective atmosphere to obtain a vanadium-nitrogen alloy and a mixed gas 3. The method uses vanadium oxynitride to prepare vanadium-nitrogen alloy, which has the advantages of low dosage of carbonaceous reducing agent and reduced carbon emission, and realizes low-carbon and efficient preparation of the vanadium-nitrogen alloy.