Method for recovering molybdenum from low-molybdenum ammonia leaching residues
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A technology for ammonia leaching and molybdenum slag, applied in the field of molybdenum recovery, can solve the problems of complicated procedures, low economic benefit and high cost, and achieve the effects of environmental protection of the process flow, simple and easy process, and low production cost.
Inactive Publication Date: 2020-10-27
JIANGXI COPPER
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Problems solved by technology
These two methods have cumbersome procedures, high labor intensity, low yield, relatively serious pollution, large consumption of raw materials, low economic benefits, and high costs.
Method used
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Embodiment 1
[0050] The ammonia leaching slag of an associated molybdenum ore smelting and processing enterprise has the following components:
[0051]
[0052] (1) dehydrating the low-molybdenum ammonia leaching slag after ammonia leaching, 300g of ammonia leaching slag after water, water content 20.15%;
[0053] (2) Add low-molybdenum ammonia leaching slag to 90g of sodium carbonate and water for stirring and slurrying, and the liquid-solid ratio is 3:1;
[0054] (3) Seal and heat the reactor to 95°C to 100°C, pressurize and feed oxygen to a pressure of 0.5Mpa;
[0055] (4) Heating to 180°C for reaction;
[0056] (5) Stir at constant temperature, pressurize and react for 2 hours;
[0057] (6) Repeat the above steps to carry out three groups of tests and the results are as follows:
[0058]
Embodiment 2
[0060] The ammonia leaching slag after three times ammonia leaching in an associated molybdenum ore smelting and processing enterprise has the following components:
[0061]
[0062] Carry out extended line test, parallel test 3 groups, each group ammonia leaching slag weight 5Kg.
[0063] (1) Dehydrate the low-molybdenum ammonia leaching slag after ammonia leaching, 5Kg of ammonia leaching slag after water, water content 22.05%;
[0064] (2) Add the low-molybdenum ammonia leaching slag to 1.2Kg of sodium carbonate and water for stirring and slurrying, and the liquid-solid ratio is 2:1;
[0065] (3) Seal and heat the reactor to 95°C to 100°C, pressurize and feed oxygen to a pressure of 0.5Mpa;
[0066] (4) Heating to 180°C for reaction;
[0067] (5) Stir at constant temperature, pressurize and react for 2 hours;
[0068] (6) Repeat the above steps to carry out three groups of tests and the results are as follows:
[0069]
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Abstract
The invention belongs to the field of hydrometallurgy, and relates to a method for leaching and recovering molybdenum from low-molybdenum ammonia leaching residues. The method specifically comprises the following steps that S1) the ammonia-impregnated low-molybdenum ammonia leaching residues are dehydrated and slurried for use; S2) the slurried low-molybdenum ammonia is added into a reaction kettle, pressurized and heated, and a pressure-maintaining reaction is performed to obtain a reaction solution and molybdenum slag; S3) the reaction solution is separated from the molybdenum slag, negativepressure concentration is carried out on the reaction solution, and acid precipitation filtration is carried out on the concentrated solution to form a molybdate filter cake; and S4) the filter cakereturns to the ammonium molybdate production process, and an ammonium molybdate product meeting the GB / T3460-2017MSA-1 level is produced. The method has the beneficial effects that due to the adoptionof the technical scheme, the process is simple and feasible, the ammonia leaching residues do not need to be dried and ground, the process is short, the technology is stable, the production cost is low, the leaching recovery rate is not lower than 94.98%, and the whole technological process is environmentally friendly.
Description
technical field [0001] The invention belongs to the field of hydrometallurgy and relates to a method for recovering molybdenum from low-molybdenum ammonia leaching slag. [0002] technical background [0003] With the production of ammonium molybdate by the traditional oxidation roasting-ammonia leaching process, the molybdenum concentrate is desulfurized into molybdenum oxide through rotary kiln oxidation roasting, and then pretreated with nitric acid to remove alkali metals, alkaline earth metals and some heavy metal impurities such as copper and iron. The treated filter cake is leached with ammonia to obtain ammonium molybdate solution low molybdenum ammonia leaching residue. The yield of low-molybdenum ammonia leaching slag accounts for about 10%-20% of molybdenum oxide calcine, and the low-molybdenum ammonia leaching slag contains about 5%-15% molybdenum, accounting for 2-5% of the total molybdenum metal. At present, using hydrochloric acid treatment process to recover ...
Claims
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