A kind of method for preparing ammonium molybdate by molybdenite

A technology of molybdenite and ammonium molybdate, which is applied in the field of molybdenum smelting, can solve the problems of refractory acid-containing wastewater, increased treatment costs, serious equipment corrosion, etc., achieve low equipment requirements, reduce waste residue and wastewater discharge, and reduce environmental pollution small effect

Active Publication Date: 2017-04-12
CENT SOUTH UNIV
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Problems solved by technology

However, this process still has the following disadvantages in practical application: a large amount of lime added in the roasting process is finally converted into CaSO 4 , the amount of slag is large; the clinker is leached under acidic conditions, the equipment is corroded seriously, the operating conditions are poor, the amount of sulfuric acid is large and the circulation is difficult, resulting in a large amount of difficult-to-treat acid-containing wastewater; the molybdenum acid obtained after the leaching of calcium molybdate needs to Ion exchange or solvent extraction can be converted into ammonium molybdate products, the process is complicated and the cost is high. In addition, ion exchange and solvent extraction produce a large amount of ammonia nitrogen-containing wastewater, which increases treatment costs

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  • A kind of method for preparing ammonium molybdate by molybdenite

Examples

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Effect test

Embodiment 1

[0039] Example 1: Press CaCO 3 / MoS 2 The molar ratio is 3.6. Calcium carbonate, a certain molybdenite (the mass percentage of Mo is 40.33%) and 3% calcium fluoride are ground and mixed to obtain a raw meal. The raw meal size D90 is 110 μm. Then, the raw meal is roasted in an oxygen-rich atmosphere at 600° C. for 2 hours in a roasting furnace to obtain clinker. After the clinker is cooled to room temperature, it is finely ground with a vibration mill, and the clinker particle size D90 is 130 μm. After the clinker is leached with water, solid-liquid separation is performed, and rhenium is recovered from the leachate. The leaching residue after water leaching is added to a stirred leaching tank, leached with an ammonium carbonate solution with a concentration of 800g / L, and reacted at 100°C for 4 hours. After the reaction, the leaching pulp is vacuum filtered, and the filter cake is washed three times with pure water. The molybdenum leaching rate in molybdenite is 98.12%. Afte...

Embodiment 2

[0040] Example 2: Press CaCO 3 / MoS 2 The molar ratio is 3.0. Calcium carbonate, a certain molybdenite (the mass percentage of Mo is 40.33%) and 2% calcium fluoride are ground and mixed to obtain a raw meal. The raw meal size D90 is 100μm. Then, the raw meal is roasted in an oxygen-rich atmosphere at 600°C for 0.5 hour in a roasting furnace to obtain clinker. After the clinker is cooled to room temperature, it is ground with a vibration mill, and the clinker particle size D90 is 70 μm. After the clinker is leached with water, solid-liquid separation is performed, and rhenium is recovered from the leachate. Add the leaching residue after water leaching into a stirred leaching tank, leaching with an ammonium carbonate solution with a concentration of 300g / L, and reacting at 90°C for 6 hours. After the reaction, the leaching pulp is vacuum filtered, and the filter cake is washed three times with pure water. The molybdenum leaching rate in molybdenite is 75.61%. Then, similar to...

Embodiment 3

[0041] Example 3: Press CaCO 3 / MoS 2 The molar ratio is 5.0. Calcium carbonate, a certain molybdenite (the mass percentage of Mo is 40.33%) and 10% calcium fluoride are ground and mixed to obtain a raw meal. The raw meal size D90 is 80 μm. Then, the raw meal was baked in a roasting furnace with air and roasted at 400°C for 6 hours to obtain clinker. After the clinker is cooled to room temperature, it is ground with a vibration mill, and the clinker particle size D90 is 70 μm. After the clinker is leached with water, solid-liquid separation is performed, and rhenium is recovered from the leachate. The leaching residue after water leaching is added to the leaching equipment, the leaching equipment is a leaching tank with stirring, leached with an ammonium carbonate solution with a concentration of 800g / L, and reacted at 70°C for 8 hours. After the reaction, the leaching pulp is vacuum filtered, and the filter cake is washed three times with pure water. The molybdenum leaching ...

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Abstract

The invention discloses a method for preparing ammonium molybdate through treating molybdenite. The method is characterized in that alkalescence leaching agent (ammonium carbonate) beneficial to forming a local technology cycle is adopted, the leaching agent is easy to decompose at high temperature, gas generated by decomposition can be used for synthesizing the leaching agent again, and cycle use is achieved; calcium carbonate is added in the process of oxidizing roasting, the calcium carbonate and the molybdenite perform chemical reaction, in this way, molybdenum in the molybdenite is converted into calcium molybdate easy to leach through the ammonium carbonate solution, and after leaching through the ammonium carbonate solution, the main component of leaching residues is the calcium carbonate which can be returned to the preparation cycle to be used. In this way, the method achieves recycling, and is simple in process, low in operation difficulty, high in utilization rate of resources, low in cost and small in environment pollution.

Description

Technical field [0001] The invention relates to a method for preparing ammonium molybdate from molybdenite, and belongs to the technical field of molybdenum smelting. Background technique [0002] my country is a big country with molybdenum resources, and its output accounts for more than 35% of the world's output. Molybdenite is the most important raw material in the molybdenum metallurgical industry. The processes for treating molybdenite that have been reported at home and abroad mainly include the traditional oxidation roasting-ammonia leaching process and the total wet oxidation process. The traditional oxidation roasting-ammonia leaching process is widely used because of its mature process, low investment and easy mastery. At present, more than 90% of molybdenite in China is treated by this process. However, this process has obvious shortcomings, including: oxidation Roasting produces a large amount of low-concentration sulfur-containing flue gas. At present, there is no g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/14C22B1/02C22B34/34
CPCY02P10/20
Inventor 李小斌周秋生席俊涛彭志宏刘桂华齐天贵
Owner CENT SOUTH UNIV
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