Method for preprocessing scheelite and preparing ferro-tungsten
A scheelite and pretreatment technology, which is applied in the direction of improving process efficiency, can solve the problems of high production cost and large energy consumption, and achieve the effects of reducing requirements, reducing energy consumption, and simplifying the smelting process
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Embodiment 1
[0020] Use a 1L reactor to feed 150g tungsten concentrate, -325 mesh accounts for 75%, L / S=4:1, the amount of concentrated hydrochloric acid is 1.5 times the theory (102ml), and stir in a closed container open to the atmosphere for pretreatment 3 hours, filter. Add new ore, measure the amount of acid in the aforementioned filtrate, according to 1.5 times the theoretical acid amount, add insufficient acid, continue leaching, after two cycles, the tungsten concentrate WO 3 The grade is maintained at around 83%. Moreover, after two cycles of leaching, the calcium concentration in the pretreatment solution increased significantly.
[0021] The pretreatment slag is roasted at 500°C for 1 hour to generate crude tungstic acid. The crude tungstic acid and iron powder are mixed according to the Fe:W ratio of 1:4, and transferred to an atmosphere furnace filled with hydrogen for reduction smelting at 1600°C to prepare high-quality ferro-tungsten alloy.
Embodiment 2
[0023] Use a 1L reactor to feed 300g tungsten concentrate, -325 mesh accounts for 85%, L / S=2:1, the amount of concentrated hydrochloric acid is twice the theoretical amount (272ml), stir in a closed container open to the atmosphere for pretreatment 2 hours, filter. Add acid to the filtrate, add new ore, and continue leaching. After three cycles like this, the tungsten concentrate WO 3 The grade was maintained at about 77%, and after three cycles of leaching, the calcium concentration of the pretreatment solution increased to 110g / L.
[0024] The pretreated slag is roasted at 400°C for 2 hours to generate crude tungstic acid. The crude tungstic acid and iron powder are mixed according to the Fe:W ratio of 2:3, and transferred to an atmosphere furnace filled with hydrogen for reduction smelting at 1500°C to prepare high-quality ferro-tungsten alloy.
Embodiment 3
[0026] Use a 1L reactor to feed 300g of tungsten concentrate, -325 mesh 95%, L / S=1:1, the amount of concentrated hydrochloric acid is twice the theoretical amount (272ml), and stir in a closed container open to the atmosphere for 1 hour pretreatment ,filter. Add acid to the filtrate, add new ore, and continue leaching. After two cycles, the tungsten concentrate WO 3 The grade is maintained at around 82%.
[0027] The pretreatment slag is roasted at 500°C for 2 hours to generate crude tungstic acid. The crude tungstic acid and iron powder are mixed according to the Fe:W ratio of 2:3, and transferred to an atmosphere furnace filled with hydrogen for reduction melting at 1600°C to prepare high-quality ferro-tungsten alloy.
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