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Method for extracting tungsten from scheelite
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A scheelite and roasting technology, applied in the field of tungsten extraction, can solve problems such as low production efficiency and safety problems, and achieve the effect of convenient operation
Active Publication Date: 2016-09-28
赣州海盛钨业股份有限公司
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Problems solved by technology
[0003] my country's scheelite smelting mainly adopts high-pressure alkali decomposition process. Whether it is the previous sodium carbonatepressure cooking method or the current mainstream sodium hydroxide pressure cooking method, the decomposition of scheelite can only be achieved under high pressure conditions. The pressure is usually 6- About 18 kg, which often brings safety problems; at the same time, the production is intermittently operated in a single kettle, and the production efficiency is low
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Embodiment 2
[0030] Embodiment 2: scheelite contains 70.32% WO 3 . The weight of scheelite is 100g, 2 times the theoretical amount of sodium phosphate, 2 times the theoretical amount of calciumfluoride, roasted at 500°C for 2 hours, the roasted product is stirred and leached with water, the liquid-solid ratio is 3:1, the temperature is room temperature, kept for 2 hours, filtered , washed with water, dried, the slag contains insoluble WO 3 It is 18.57%, and the decomposition rate reaches 57.31%.
Embodiment 3
[0031] Embodiment 3: scheelite contains 30.35% WO 3 . The weight of scheelite is 80g, 3.5 times the theoretical amount of sodium phosphate, roasted at 850°C for 2 hours, 6 times the theoretical amount of calciumfluoride, the roasted product is stirred and leached with water, the liquid-solid ratio is 4:1, the temperature is 50°C, kept for 3 hours, filtered , washed with water, dried, the slag contains insoluble WO 3 It is 1.37%, and the decomposition rate reaches 96.39%.
Embodiment 4
[0032] Embodiment 4: scheelite contains 56.32% WO 3 . The weight of scheelite is 120g, 2.5 times the theoretical amount of sodium phosphate, 5 times the theoretical amount of calcium fluoride, roasted at 650°C for 3 hours, the roasted product is stirred and leached with water, the liquid-solid ratio is 6:1, the temperature is 90°C, kept for 4 hours, filtered , washed with water, dried, the slag contains insoluble WO 3 It is 1.09%, and the decomposition rate reaches 98.48%.
[0033] From the above test data, it can be concluded that the method for extracting tungsten from scheelite provided by the present invention, compared with the existing process of decomposing scheelite, can react under normal pressure environment, and it is easy to realize continuous production and operation. It is more convenient and safe, and the insoluble WO contained in the slag 3 extremely low.
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Abstract
The invention relates to a method for extracting tungsten from scheelite. The method comprises steps as follows: Step 1: the scheelite is ground to have the mesh number smaller than 325; Step 2: the ground scheelite is mixed with solidsodiumphosphate and solidcalciumfluoride, and a mixture is obtained; Step 3: the mixture is placed in a high-temperature furnace for calcination, and a calcination material is obtained; Step 4: the calcination material is subjected to water leaching treatment, a sodiumtungstate solution is obtained, and the tungsten is extracted from the scheelite. According to the method for extracting the tungsten from the scheelite, reactions can be conducted in a normal-pressure environment, high-pressure equipment is not required, continuous production can be realized easily, and the method is more convenient and safer to operate.
Description
technical field [0001] The invention relates to a method for extracting tungsten from scheelite, and relates to the field of mineral extraction. Background technique [0002] Two-thirds of the total tungsten resources in my country are scheelite. With the continuous consumption of black tungsten resources, scheelite has become the main raw material of tungsten industry. [0003] my country's scheelite smelting mainly adopts high-pressure alkali decomposition process. Whether it is the previous sodiumcarbonatepressure cooking method or the current mainstream sodium hydroxidepressure cooking method, the decomposition of scheelite can only be achieved under high pressure conditions. The pressure is usually 6- About 18 kg, which often brings safety problems; at the same time, the production is intermittent operation of single kettle, and the production efficiency is low. [0004] Therefore, it is necessary to design a method for extracting tungsten from scheelite to overcome...
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