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A ammonia leaching process for molybdenum calcination to reduce slag formation rate and molybdenum content in slag

A molybdenum calcine and process technology, applied in the field of molybdenum calcine ammonia leaching process, can solve the problems of cumbersome process for recovering molybdenum, hindering the dissolution of molybdenum trioxide, troublesome ammonia leaching slag treatment, etc., and achieves strong repeatability and molybdenum content. The effect of reducing and reducing the rate of slag formation

Active Publication Date: 2015-07-29
JINDUICHENG MOLYBDENUM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the traditional ammonia leaching method has the following problems: molybdenum calcined sand not only contains molybdenum trioxide, but also a small amount of iron-containing gangue minerals such as iron sulfate and iron molybdate. The iron hydroxide colloid is generated in the environment, and the iron hydroxide colloid is wrapped on the surface of the molybdenum calcine particles in the form of a thin film, which hinders the dissolution of molybdenum trioxide in the molybdenum calcine and forms molybdenum trioxide aggregates
According to the water washing-ammonia leaching process, for every 100 tons of ammonium molybdate produced, 2.2 to 3.3 tons of molybdenum metal will be lost due to non-leaching. The lost molybdenum exists in the ammonia leaching residue, and the treatment of the ammonia leaching residue is more troublesome. The process of recovering molybdenum is cumbersome

Method used

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  • A ammonia leaching process for molybdenum calcination to reduce slag formation rate and molybdenum content in slag
  • A ammonia leaching process for molybdenum calcination to reduce slag formation rate and molybdenum content in slag
  • A ammonia leaching process for molybdenum calcination to reduce slag formation rate and molybdenum content in slag

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Embodiment 1

[0024] The present embodiment reduces the slagging rate and the molybdenum calcination ammonia leaching process of molybdenum content in slag comprises the following steps:

[0025] Step 1. Mole ratio Mo:NH 3 =1:2.5, solid-to-liquid ratio 1:2.5 Mix molybdenum calcined sand, ammonia water and deionized water evenly to obtain a suspension, and then stir the suspension at a temperature of 65°C until the pH of the suspension is Be 6.8; The mass percentage concentration of described ammoniacal liquor is 26%, and the mass percentage composition of molybdenum in the described molybdenum calcined sand is 63%;

[0026] Step 2, filtering the suspension with a pH value of 6.8 in step 1 to obtain filter cake and filtrate;

[0027] Step 3: The filter cake described in step 2 is washed with ammonia water with a mass percentage concentration of 26%. The number of washings is 3 times, and the washed filter cake is placed in a drying oven to dry at a drying temperature of 100°C. After 8 hour...

Embodiment 2

[0033] The present embodiment reduces the slagging rate and the molybdenum calcination ammonia leaching process of molybdenum content in slag comprises the following steps:

[0034] Step 1. Mole ratio Mo:NH 3 =1:2, solid-to-liquid ratio 1:2 Mix molybdenum calcined sand, ammonia water and deionized water evenly to obtain a suspension, and then stir the suspension at a temperature of 70°C until the pH of the suspension is Be 7.0; The mass percentage concentration of described ammonia liquor is 28%, and the mass percentage composition of molybdenum in the described molybdenum calcined sand is 61.5%;

[0035] Step 2, filtering the suspension with a pH value of 7.0 in step 1 to obtain filter cake and filtrate;

[0036] Step 3: Wash the filter cake described in Step 2 with ammonia water with a concentration of 28% by mass, the number of washings is 1 time, and place the washed filter cake in a drying oven to dry at a drying temperature of 80°C. After natural cooling for 10 hours, ...

Embodiment 3

[0043] The present embodiment reduces the slagging rate and the molybdenum calcination ammonia leaching process of molybdenum content in slag comprises the following steps:

[0044] Step 1. Mole ratio Mo:NH 3 =1:3, solid-to-liquid ratio 1:3 Mix molybdenum calcined sand, ammonia water and deionized water evenly to obtain a suspension, and then stir the suspension at a temperature of 70°C until the pH of the suspension is Be 6.5; The mass percentage concentration of described ammonia liquor is 25%, and the mass percentage composition of molybdenum in the described molybdenum calcined sand is 62.4%;

[0045] Step 2, filtering the suspension with a pH value of 6.5 in step 1 to obtain filter cake and filtrate;

[0046] Step 3: Wash the filter cake described in step 2 with ammonia water with a mass percentage concentration of 27%, the number of washings is 2 times, and place the washed filter cake in a drying oven to dry at a drying temperature of 80°C. After 8 hours of natural co...

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Abstract

The invention provides a commercial molybdenum oxide ammonia leaching technology capable of reducing slagging rate and molybdenum content in slag. The commercial molybdenum oxide ammonia leaching technology comprises the following steps: 1, uniformly mixing commercial molybdenum oxide, ammonium water and deionized water in certain proportions so as to obtain turbid liquid, and then stirring the turbid liquid at the temperature of 60-70 DEG C till the pH value of the turbid liquid is 6.5-7.0; 2, filtering so as to obtain filter cakes and filtrate; and 3, washing the filter cakes by adopting the ammonia water, placing the washed filter cakes in a drying cabinet so as to be dried, naturally cooling to obtain ammonia leaching slag, and uniformly mixing the ammonia water after washing and the filtrate in the step 2 so as to obtain an ammonia leaching solution. The commercial molybdenum oxide ammonia leaching technology is simple and practicable, has strong repeatability and is suitable for large-scale industrial production; the reducing slagging rate and molybdenum content in slag are substantially reduced after the ammonia leaching treatment is carried out by adopting the commercial molybdenum oxide ammonia leaching technology.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to an ammonia leaching process for molybdenum calcination to reduce the slag forming rate and the molybdenum content in the slag. Background technique [0002] Molybdenum calcined sand, also known as industrial molybdenum oxide, is an important chemical raw material, which is roasted and smelted from molybdenum concentrate. Molybdenum calcined sand is used to prepare ammonium molybdate. Ammonium molybdate is an important chemical product, mainly used in powder metallurgy and electronics industry, and is the basic raw material for making molybdenum powder. In addition, molybdenum calcine can also be used as a catalyst, smoke suppression and flame retardant, pigment, etc. in the petroleum industry. [0003] In the process of using molybdenum calcine to prepare ammonium molybdate, ammonia leaching process is generally used to leach molybdenum from molybdenum calcin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/14C22B3/22C22B34/34
CPCY02P10/20
Inventor 唐军利
Owner JINDUICHENG MOLYBDENUM CO LTD
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