Preparation method of high-density, large-scale, ultra-fine pore core graphite material for molten salt reactor
A high-density, large-size technology, which is applied in the field of preparation of high-density and large-size ultra-fine-pore nuclear graphite materials for molten salt reactors, can solve the problems of large specific surface area and surface energy of particles, and the inability to prepare large-size nuclear graphite materials. Achieve uniform internal temperature, eliminate voids, and avoid stress concentration
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Embodiment 1
[0098] 1. Raw materials: 80 parts by weight of pitch coke with an average particle size of 1 μm and 20 parts by weight of pitch;
[0099] 2. Preparation method:
[0100] 1) Selection of raw materials: coke aggregate and binder, fixed carbon content in coke aggregate is ≥98.5%, ash content ≤0.5%, boron (B) and gadolinium (Gd) are less than 0.1ppm, samarium (Sm), europium (Eu), cadmium (Cd) and lithium (Li) are all less than 0.5ppm, moisture ≤0.5%, sulfur ≤0.1%;
[0101] The ash content in the binder is ≤0.5%, the volatile content is 35-60%, the coking value is 40-70%, the softening point is 80-200°C, the quinoline insoluble matter is 8-25%, and the toluene insoluble matter is 25- 55%;
[0102] 2) Raw material grinding: the coke aggregate is ground and pulverized so that the average particle size does not exceed 1 μm;
[0103] 3) Ingredients and kneading: Pour pitch coke and pitch into a kneader and knead at a temperature of 150°C for 80 minutes;
[0104] 4) Molding: put the...
Embodiment 2
[0110] 1. Raw materials: 70 parts by weight of petroleum coke with an average particle size of 3 μm and 30 parts by weight of pitch;
[0111] 2. Preparation method:
[0112] 1) Selection of raw materials: coke aggregate and binder, fixed carbon content in coke aggregate is ≥98.5%, ash content ≤0.5%, boron (B) and gadolinium (Gd) are less than 0.1ppm, samarium (Sm), europium (Eu), cadmium (Cd) and lithium (Li) are all less than 0.5ppm, moisture ≤0.5%, sulfur ≤0.1%;
[0113] The ash content in the binder is ≤0.5%, the volatile content is 35-60%, the coking value is 40-70%, the softening point is 80-200°C, the quinoline insoluble matter is 8-25%, and the toluene insoluble matter is 25- 55%;
[0114] 2) Raw material grinding: the coke aggregate is ground and pulverized so that the average particle size does not exceed 3 μm;
[0115] 3) Batching and kneading: Pour pitch coke and pitch into a kneader and knead at a temperature of 300°C for 120 minutes;
[0116] 4) Molding: put t...
Embodiment 3
[0122] 1. Raw materials: 65 parts by weight of pitch coke with an average particle size of 5 μm and 35 parts by weight of pitch;
[0123] 2. Preparation method:
[0124] 1) Selection of raw materials: coke aggregate and binder, fixed carbon content in coke aggregate is ≥98.5%, ash content ≤0.5%, boron (B) and gadolinium (Gd) are less than 0.1ppm, samarium (Sm), europium (Eu), cadmium (Cd) and lithium (Li) are all less than 0.5ppm, moisture ≤0.5%, sulfur ≤0.1%;
[0125] The ash content in the binder is ≤0.5%, the volatile content is 35-60%, the coking value is 40-70%, the softening point is 80-200°C, the quinoline insoluble matter is 8-25%, and the toluene insoluble matter is 25- 55%;
[0126] 2) Raw material grinding: the coke aggregate is ground and pulverized so that the average particle size does not exceed 5 μm;
[0127] 3) Ingredients and kneading: Pour pitch coke and pitch into a kneader and knead at a temperature of 400°C for 150 minutes;
[0128] 4) Molding: put th...
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