Method for extracting metallic elements of ferrum, magnesium and calcium from molybdenum milltailings

A technology of metal elements and tailings, which is applied in the fields of magnesium, calcium, and metal element iron extraction, can solve the problems of low iron recovery rate, low magnetic iron content, and inability to comprehensively utilize it, achieving less waste liquid discharge, simplified operation, The effect of reducing the amount of waste liquid

Inactive Publication Date: 2010-09-15
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the iron element in the molybdenum tailings exists in various forms, and the magnetic iron content is not high, so the iron recovery rate of the magnetic separation method is low, and other co-associated metal elements in the molybdenum beneficiation tailings cannot be comprehensively utilized.
In addition to iron, metal elements such as magnesium and calcium are often associated in molybdenum beneficiation tailings, and there are no reports on the recycling of iron, magnesium and calcium as target elements using wet chemical methods.

Method used

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  • Method for extracting metallic elements of ferrum, magnesium and calcium from molybdenum milltailings
  • Method for extracting metallic elements of ferrum, magnesium and calcium from molybdenum milltailings
  • Method for extracting metallic elements of ferrum, magnesium and calcium from molybdenum milltailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Pass the molybdenum beneficiation tailings whose main components are Si 22.79wt.%, Ca 16.21wt.%, Fe 9.117wt.%, Mg8.87wt.%, S 1.412wt.%, Al 1.289wt.% through a 40-mesh sieve, The sieved material is put into a ball mill tank for ball milling for 10 minutes, then passed through a 180-mesh sieve by a vibrating sieving machine, and the sieved material is taken. Mix 10wt.% hydrochloric acid with the undersize material at a liquid-solid ratio of 8:1, stir, then react in a water bath at 100°C for 4 hours, filter and wash to obtain acid dipping solution and filter residue. Hydrogen peroxide was added dropwise to the pickling solution, and the Fe in the solution 2+ All oxidized to Fe 3+ , to obtain filtrate a; filtrate a was heated to 60 ° C, and the precipitant was added dropwise and stirred, and the pH was controlled to 4.0 until the precipitation was complete, filtered and washed to obtain crude Fe(OH) 3 Filter residue and filtrate b, crude Fe(OH) 3 Heat the filter residue ...

Embodiment 2

[0030] Pass the molybdenum beneficiation tailings whose main components are Si 22.79wt.%, Ca 16.21wt.%, Fe 9.117wt.%, Mg8.87wt.%, S 1.412wt.%, Al 1.289wt.%. The sieved material is put into a ball mill tank for ball milling for 15 minutes, then passed through a 200-mesh sieve by a vibrating sieving machine, and the sieved material is taken. Mix 20 wt.% hydrochloric acid with the undersize material at a liquid-solid ratio of 6:1, stir, then react in a water bath at 90°C for 8 hours, filter and wash to obtain acid dipping solution and filter residue. Hydrogen peroxide was added dropwise to the pickling solution, and the Fe in the solution 2+ All oxidized to Fe 3+ , to obtain filtrate a; filtrate a was heated to 80 ° C, and the precipitant was added dropwise and stirred, and the pH was controlled to 3.8 until the precipitation was complete, filtered and washed to obtain crude Fe(OH) 3 Filter residue and filtrate b, crude Fe(OH) 3 Heat the filter residue with dilute hydrochloric...

Embodiment 3

[0033]The molybdenum beneficiation tailings whose main components are Si 22.79wt.%, Ca 16.21wt.%, Fe 9.117wt.%, Mg8.87wt.%, S 1.412wt.%, Al 1.289wt.% are passed through a 120-mesh sieve, The sieved material was put into a ball mill tank for ball milling for 20 minutes, then passed through a 240-mesh sieve by a vibrating sieving machine, and the sieved material was taken. Mix 30wt.% hydrochloric acid with the undersize material at a liquid-solid ratio of 4:1, stir, then react in a water bath at 80°C for 4 hours, filter, and wash to obtain acid dipping solution and filter residue. Hydrogen peroxide was added dropwise to the pickling solution, and the Fe in the solution 2+ All oxidized to Fe 3+ , to obtain filtrate a; filtrate a was heated to 40 ° C, and the precipitant was added dropwise and stirred, and the pH was controlled to 4.5 until the precipitation was complete, filtered and washed to obtain crude Fe(OH) 3 Filter residue and filtrate b, crude Fe(OH) 3 Heat the filter ...

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Abstract

The invention relates to a method for extracting metallic elements of ferrum, magnesium and calcium from molybdenum milltailings, belonging to the technical field of wet-process metallurgy and comprehensive utilization of tailings. The method comprises the following steps of: treating the molybdenum milltailings by using a hydrochloric acid solution to obtain pickle liquor and adding hydrogen peroxide to the pickle liquor to oxidize Fe<2+> totally into Fe<3+>; dropping ammonia water into the solution and controlling the pH value to prepare a crude Fe(OH)3 precipitate; dissolving the crude Fe(OH)3 in acid, filtering and then dropping the ammonia water to carry out a precipitation reaction; filtering and calcining at a high temperature of 750 DEG C to obtain a Fe2O3 product with a purity larger than 98 weight percent; dropping NaOH to ferrum precipitate filter liquor and controlling the pH value to remove impurity elements; continuing to dropping NaOH and controlling the pH value to obtain a Mg(OH)2 product with a purity larger than 83 weight percent; and dropping Na2CO3 into magnesium precipitate filter liquor to obtain a CaCO3 product with a purity larger than 97 weight percent. The process adopts full liquid-phase operations and has no waste gas pollution, and a tail solution is mainly a NaCl and NaOH mixture solution which is easy to treat. The recovery rates of the ferrum, the magnesium and the calcium all reach higher than 80 percent, and meanwhile, the enrichment of trace elements such as molybdenum, tungsten, copper, and the like in the tailings is also realized.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy and comprehensive utilization of tailings, and in particular relates to a method for extracting metal elements iron, magnesium and calcium from molybdenum beneficiation tailings. Background technique [0002] Molybdenum beneficiation mainly adopts flotation technology to extract molybdenum element, so molybdenum beneficiation tailings contain a large amount of toxic organic flotation agents, simple accumulation and backfilling of tailings cause serious environmental pollution, and other beneficial metal elements in molybdenum beneficiation tailings cannot be recycled , resulting in a waste of resources. At present, the recycling of molybdenum beneficiation tailings mainly adopts wet chemical method to recover molybdenum, tungsten, copper, sulfur and other trace elements in tailings, and adopts magnetic separation method to recover iron in tailings. The invention patent with the publicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/04C22B15/00C22B26/22C22B26/20
CPCY02P10/20
Inventor 张海龙秦红彬徐利华
Owner UNIV OF SCI & TECH BEIJING
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