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Method for producing ammonium molybdate from molybdenum-bismuth bulk concentrates of high impurity content and low grade

A mixed concentrate, low-grade technology, applied in the direction of improving process efficiency, can solve problems such as low calcine leaching rate and low molybdenum content

Inactive Publication Date: 2011-10-19
HUNAN RONGHONG MOLYBDENUM MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] This high-impurity and low-grade molybdenum-bismuth mixed concentrate is mostly processed by the traditional process of producing ammonium molybdate with molybdenite concentrate as raw material. However, the leached ammonium molybdate solution has low molybdenum content and a large amount of impurities. , cannot directly produce qualified ammonium molybdate, but can only produce chemical molybdenum oxide with high impurities, and then produce ferromolybdenum as a raw material for iron and steel metallurgy, and the leaching rate of calcine is low, resulting in the recovery rate of molybdenum can only reach 80% %

Method used

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  • Method for producing ammonium molybdate from molybdenum-bismuth bulk concentrates of high impurity content and low grade

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Take 1 ton of high-impurity and low-grade molybdenum-bismuth mixed concentrate, and continuously roast it step by step in a reverberatory furnace at 200°C to 700°C for 9 hours; the solid / liquid ratio is 1:3.5, add 500kg of mixed alkali, and leach at 70°C for 2 hours; the leachate is processed with concentrated hydrochloric acid Adjust the pH value to 7.0, stir for 30 minutes; filter; the filtrate is adsorbed on the weak base anion resin for about 75 minutes; add industrial MgCl to the molybdenum analysis solution according to 2 times the stoichiometric amount 2 In addition to P and Si, after holding at 50°C for 30 minutes, cool down to 40°C and filter; add industrial concentrated nitric acid crystal ammonium molybdate to the filtrate at 55°C according to 1.05 times of stoichiometric measurement, and produce ammonium molybdate with high-impurity and low-grade molybdenum-bismuth mixed concentrate The result (%) is as follows:

[0011]

Embodiment 2

[0013] Take 1.5 tons of high-impurity and low-grade molybdenum-bismuth mixed concentrate, and continuously roast it step by step in a reverberatory furnace at 200°C to 700°C for 10 hours, with a solid / liquid ratio of 1:4, add 700kg of mixed alkali, and leach at 80°C for 2 hours. Adjust the pH value to 8.0, and filter after stirring for 20 minutes; the filtrate is adsorbed on the weak base anion resin and the contact time is about 80 minutes. 2 In addition to P and Si, after 40 minutes of heat preservation, the temperature was lowered to 40 ° C and filtered, and the filtrate was added to 1.05 times of stoichiometric measurement at 50 ° C to add industrial concentrated nitric acid to crystallize ammonium molybdate, and the results of producing ammonium molybdate with high impurities and low grade molybdenum and bismuth mixed concentrates ( %)as follows:

[0014]

[0015] Ammonium molybdate

Embodiment 3

[0017] Take 3 tons of high-impurity and low-grade molybdenum-bismuth mixed concentrate, and continuously roast it step by step in a reverberatory furnace at 200°C to 700°C for 12 hours, with a solid / liquid ratio of 1:5, add 1100kg of mixed alkali, and leach at 90°C for 1.5 hours. Adjust the pH value to 6.5 with hydrochloric acid, filter after stirring for 50 minutes; the filtrate is adsorbed on a weak base anion resin for about 70 minutes, and the molybdenum analysis solution is added to industrial MgCl at 48 ° C according to 1.5 times the stoichiometric amount. 2 In addition to P and Si, after holding for 25 minutes, cool down to 45°C and filter, add industrial concentrated nitric acid to crystallize ammonium molybdate at 40°C according to 1.06 times of stoichiometric measurement, the result of producing ammonium molybdate from molybdenum-bismuth mixed concentrate with high impurities and low grade (%)as follows:

[0018]

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Abstract

The invention discloses a method for producing ammonium molybdate from molybdenum-bismuth bulk concentrates of high impurity content and low grade. The method is characterized by: roasting molybdenum-bismuth bulk concentrates of high impurity content and low grade in a reverberatory furnace or a rotary kiln for 8-16 hours continuously from a low temperature of 200 DEG C to a high temperature of 700 DEG C step by step; mixing calcine, mixed base and tap water for leaching molybdenum; subjecting the lixivium from last step to acid adjustment and impurity removal; adding an acid adjusted and impurity removed filtrate into industrial inorganic acid and adjusting the pH value to a range between 2-5; exchanging weak base anion resin for molybdenum; adding magnesium chloride into an ammonium molybdate solution obtained from desorption for purifying so as to remove P and Si; Adding industrial hydrochloric acid or industrial nitric acid into the purified ammonium molybdate solution bring the pH value ranging from 1.5 to 2.5, and conducting a vacuum filtration, thus obtaining ammonium molybdate crystals; drying and interlotting the crystals so as to obtain an ammonium molybdate product.

Description

Technical field: [0001] The invention relates to a method for producing ammonium molybdate from molybdenum concentrate, in particular to a method for producing ammonium molybdate from high-impurity and low-grade molybdenum-bismuth mixed concentrate. Background technique: [0002] In nature, bismuth is often accompanied by a variety of metals, among which there is a bismuth-molybdenum mixed ore. In order to achieve a high comprehensive recovery rate, most of the bismuth is firstly selected into bismuth concentrate by chemical agents, and then molybdenum is selected into high-impurity low-grade minerals by chemical agents. Molybdenum-bismuth mixed concentrate, its composition is: Mo 10-25%, Bi 3-10%, SiO 2 5-10%, S 2-5%, P 1-3%, Ag 300-600g / T. If this high-impurity and low-grade molybdenum-bismuth mixed concentrate is further refined to a standard-grade molybdenum concentrate, the dressing cost is very high, and the recovery rate of its molybdenum can only reach 70%. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/34C22B1/02C22B3/12C22B3/24
CPCY02P10/20
Inventor 汤志强杜军李万龙赖坚
Owner HUNAN RONGHONG MOLYBDENUM MATERIAL
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