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Method for smelting ferro-molybdenum from ammonia leaching residue to recover molybdenum

An ammonia leaching and ferromolybdenum technology is applied in the field of molybdenum metallurgy, which can solve the problems of unstable technical and economic indicators and treatment results, severe acid corrosion, and high equipment investment, so as to improve the comprehensive utilization process, efficient recycling, and metal recovery. high rate effect

Active Publication Date: 2014-11-19
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The soda roasting water leaching method and the sodium carbonate wet leaching method have good adaptability and high metal recovery rate, but the process of this method is relatively cumbersome, that is, the ammonia leaching residue needs to be dried, crushed, finely ground, batched, roasted, leached, etc. In addition, the energy consumption is large, the equipment investment is high, the operation is not simple and easy to produce secondary pollution
The acid decomposition extraction method has no effect on the unoxidized or incompletely oxidized molybdenum in the ammonia leaching residue, and the acid corrosion is serious, the operating environment is poor, and the environment is polluted
The hyperbaric oxygen acid (alkali) leaching method has high requirements on equipment, and is currently in the process of experimental research, and its technical and economic indicators and treatment results are still unstable

Method used

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  • Method for smelting ferro-molybdenum from ammonia leaching residue to recover molybdenum
  • Method for smelting ferro-molybdenum from ammonia leaching residue to recover molybdenum

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Embodiment 1

[0023] The method for recovering molybdenum by smelting ferromolybdenum from ammonia leaching residue in this embodiment includes the following steps:

[0024] Step 1. Add 1000kg of ammonia leaching residue and auxiliary materials into the blender and mix uniformly to obtain a mixed material; the auxiliary material is composed of 293kg ferrosilicon, 346kg iron phosphorus, 69kg aluminum particles, 223kg sodium nitrate and 60kg calcium oxide; The mass percentage of molybdenum in the leaching slag is 18%, and the average particle size of the ammonia leaching slag is not greater than 5mm; the mass percentage of silicon in the ferrosilicon is 75%, and the mass percentage of iron in iron and phosphorus is 67%. The mass percentage of aluminum in the aluminum particles is 98%, the mass purity of sodium nitrate is 98%, and the mass purity of calcium oxide is 85%;

[0025] Step 2. Put the mixture described in step 1 into the smelting furnace, cover the surface of the mixture with a layer of ...

Embodiment 2

[0030] The method for recovering molybdenum by smelting ferromolybdenum from ammonia leaching residue in this embodiment includes the following steps:

[0031] Step 1. Add 1000kg of ammonia leaching residue and auxiliary materials into the blender and mix uniformly to obtain a mixed material; the auxiliary material is composed of 280kg ferrosilicon, 360kg iron phosphorus, 50kg aluminum particles, 180kg sodium nitrate and 80kg calcium oxide; The mass percentage of molybdenum in the leaching slag is 10%, and the average particle size of the ammonia leaching slag is not more than 5mm; the mass percentage of silicon in the ferrosilicon is 76%, and the mass percentage of iron in iron and phosphorus is 68%. The mass percentage of aluminum in the aluminum particles is 98%, the mass purity of sodium nitrate is 95%, and the mass purity of calcium oxide is 90%;

[0032] Step 2. Put the mixture described in step one into the smelting furnace, cover the surface of the mixture with a layer of i...

Embodiment 3

[0037] The method for recovering molybdenum by smelting ferromolybdenum from ammonia leaching residue in this embodiment includes the following steps:

[0038] Step 1. Add 1000kg of ammonia leaching residue and auxiliary materials into the mixer and mix uniformly to obtain a mixture material; the auxiliary material is composed of 310kg ferrosilicon, 290kg iron phosphorus, 80kg aluminum particles, 260kg sodium nitrate and 55kg fluorite; The mass percentage of molybdenum in the leaching slag is 20%, and the average particle size of the ammonia leaching slag is not more than 5mm; the mass percentage of silicon in the ferrosilicon is 72%, and the mass percentage of iron in iron and phosphorus is 64%. The mass percentage of aluminum in the aluminum particles is 95%, the mass purity of sodium nitrate is 96%, and the mass percentage of calcium fluoride in fluorite is 90%;

[0039] Step 2. Put the mixture described in step one into the smelting furnace, cover the surface of the mixture wit...

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Abstract

The invention discloses a method for smelting ferro-molybdenum from ammonia leaching residue to recover molybdenum. The method comprises the following steps: 1, the ammonia leaching residue and an auxiliary material are added into a mixer to be mixed uniformly to obtain a mixture, wherein the auxiliary material comprises ferro-silicon, ferro-phosphorus, aluminum particles, sodium nitrate and a fluxing agent, and the fluxing agent adopts calcium oxide or fluorite; 2, the mixture is loaded in a smelting furnace, the surface of the mixture is covered with a layer of firelighter, and a reaction product is obtained after ignition for smelting; the reaction product stands still so that iron is precipitated to form smelting residue and a ferro-molybdenum ingot, the smelting residue is removed, the ferro-molybdenum ingot cools naturally to be solidified, and the purpose of smelting ferro-molybdenum from the ammonia leaching residue to recover molybdenum is achieved. According to the method provided by the invention, the ammonia leaching residue is mixed with the smelting auxiliary material on the basis of a silicon-aluminium thermal reduction method, and the smelting residue and the ferro-molybdenum ingot are produced by a ferro-alloy self-heating reaction technique, so that the effect of recycling molybdenum metal is achieved; when used for smelting ferro-molybdenum to recover molybdenum in ammonia leaching residue, the method has the advantages of high resource utilization rate, low smelting auxiliary material consumption, small environmental pollution and high metal recovery rate.

Description

Technical field [0001] The invention belongs to the technical field of molybdenum metallurgy, and specifically relates to a method for recovering molybdenum by smelting ferromolybdenum with ammonia leaching residue. Background technique [0002] Molybdenum is a rare metal resource. According to statistics, the production capacity of molybdenum chemical products in China during the "Twelfth Five-Year Plan" period: the production capacity of ammonium molybdate reaches 60,000t / a, and the production capacity of sodium molybdate is above 6,500t / a. The standard roasting molybdenum concentrate requires about 73000t / a or more. According to the normal production of molybdenum chemical products, the slag production rate is 8% to 18%, and the molybdenum grade of the produced slag is calculated at 5% to 10%. The amount of molybdenum metal is about 292t to 1314t. At present, many ammonium molybdate manufacturers do not recover the molybdenum resources in the ammonia leaching slag, or some ma...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B34/34C22B5/04
CPCY02P10/20
Inventor 崔国伟尹孝刚符新科孙耀林
Owner JINDUICHENG MOLYBDENUM CO LTD
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