A kind of nano tungsten carbide preparation system and preparation method
A nano-tungsten carbide and preparation system technology, which is applied in the field of powder metallurgy materials, can solve problems such as complex equipment, high reaction temperature, and complicated process, and achieve the effects of improved heat utilization rate, pure carbonization atmosphere, and low reaction temperature
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Embodiment 1
[0074] Such as figure 1 As shown, a nano-tungsten carbide preparation system, the system includes a feed system 1, a raw material preheating decomposition system 2, a pre-reduction roasting system 3, a reduction carbonization system 4, a product cooling and storage system 5, a carbonization gas system 6 and Decomposition tail gas treatment system 7;
[0075] The feed system 1 includes a feed bin 1-1, a screw feeder 1-2;
[0076] The raw material preheating and decomposition system 2 includes a primary cyclone preheater 2-1, a secondary cyclone preheater 2-2 and a first discharge valve 2-3;
[0077] The pre-reduction roasting system 3 includes a pre-reduction fluidized bed reactor 3-1, a first cyclone separator 3-2, a first material leg 3-3 and a first return valve 3-4;
[0078] The reduction carbonization system 4 includes a second discharge valve 4-1, a reduction carbonization fluidized bed reactor 4-2, a second cyclone separator 4-3, a second material leg 4-4 and a secon...
Embodiment 2
[0093] The system described in Example 1 was used.
[0094] The ammonium tungsten bronze enters the cyclone preheating decomposer through the screw feeder 1-2, exchanges heat with the tail gas separated from the cyclone cooler to obtain heating and decomposes into tungsten oxide, and the decomposed tungsten oxide passes through the first discharge valve 2-3 enters the pre-reduction fluidized bed reactor 3-1, reacts at 700°C for 10 minutes, and then enters the reduction carbonization fluidized bed reactor 4-2 through the second discharge valve 4-1, in the reduction carbonization fluidized bed React in the reactor at 800°C for 2 hours; the reacted product enters the cyclone cooler through the third discharge valve 5-1, and is mixed with N 2 Carry out heat exchange, and the product after heat exchange enters the product storage tank 5-5, and nitrogen gas is passed into the product storage tank for protection to prevent oxidation; the reacted gas in the pre-reduction fluidized bed...
Embodiment 3
[0097] The system described in Example 1 was used.
[0098] Ammonium metatungstate enters the cyclone preheating decomposer through the screw feeder 1-2, exchanges heat with the tail gas separated from the cyclone cooler to obtain heating and decomposes into tungsten oxide, and the decomposed tungsten oxide passes through the first discharge The valve 2-3 enters the pre-reduction fluidized bed reactor 3-1, reacts at 600°C for 20 minutes, and then enters the reduction carbonization fluidized bed reactor 4-2 through the second outlet valve 4-1, and enters the reduction carbonization fluidized bed reactor 4-2. The bed reactor was reacted at 950°C for 2.5h; the reacted product entered the cyclone cooler through the third discharge valve 5-1, and was mixed with N 2 Carry out heat exchange, and the product after heat exchange enters the product storage tank 5-5, and nitrogen gas is passed into the product storage tank for protection to prevent oxidation; the reacted gas in the pre-r...
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