Method for separating tungsten carbide and cobalt in waste hard alloy
A technology of cemented carbide and tungsten carbide, which is applied in the direction of carbide, tungsten/molybdenum carbide, etc., can solve the problems of impurities in the product, incomplete zinc evaporation, and the inability to achieve effective separation of tungsten carbide, so as to avoid loss and not easy Evaporation loss, the effect of high product purity
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Embodiment 1
[0024] The deoiled waste cemented carbide and the tin block are mixed uniformly and put into a muffle furnace together, wherein the molar ratio of the added tin content to the cobalt content in the alloy is 1:9. In an inert atmosphere, heating to 1300 ° C, keeping the melting and dispersing time for 2h, 6h, 10h and 12h, respectively, followed by solid-liquid separation in the equipment. The obtained solid material was ball-milled to obtain powdered WC, while the liquid material was oxidized in air at 500 °C for 2 hours, and finally the oxidized SnO was separated by magnetic separation. 2 and Co 3 O 4 .
[0025] The purity of tungsten carbide obtained by different holding time is 81.83%, 91.82%, 92.37% and 92.42% respectively, indicating that the longer the holding time is, the better the solid solution of tin and cobalt in the alloy is, but the purity of WC obtained after 10h of melting time does not change much. . In order to save energy consumption, the optimal melting t...
Embodiment 2
[0027] The deoiled waste cemented carbide and the tin block are mixed evenly and put into the muffle furnace together, wherein the molar ratio of the content of added tin to the content of cobalt in the alloy is 1:9, 1:1, 9:1 and 1:1 respectively. 10:1. In an inert atmosphere, heat to 1300 ° C, keep the melting time for 10 h, and then carry out solid-liquid separation in the equipment. The obtained solid material was ball-milled to obtain powdered WC, while the liquid material was oxidized in air at 500 °C for 2 hours, and finally the oxidized SnO was separated by magnetic separation. 2 and Co 3 O 4 .
[0028] The purity of tungsten carbide obtained with different amounts of tin is 92.37%, 97.18%, 98.75% and 98.79%, respectively, indicating that the greater the amount of tin, the more favorable the solid solution of tin and cobalt in the alloy, but the molar ratio of tin and cobalt is 9:1. WC purity did not change much. In order to save cost, the optimal molar ratio of ti...
Embodiment 3
[0030] The deoiled waste cemented carbide and the tin block are mixed evenly and put into a muffle furnace together, wherein the molar ratio of the added tin content to the cobalt content in the alloy is 9:1. In an inert atmosphere, they were heated to 1300°C, 1200°C, 950°C, and 750°C, respectively, for a melting time of 10 h, and then solid-liquid separation was performed in the equipment. The obtained solid material is ball-milled to obtain powdered WC, while the liquid material is oxidized in the air, and finally the oxidized SnO is separated by magnetic separation. 2 and Co 3 O 4 .
[0031] The purities of tungsten carbide obtained at different melting temperatures were 98.75%, 98.79%, 98.81% and 98.77%, respectively. It shows that after the tin-cobalt alloy is in a liquid state, the temperature increase has no significant effect on the solid solution effect of tin and cobalt in the alloy, and the purity of the obtained WC does not change much. In order to save energy ...
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