A method for extracting tungsten from low-grade wolframite

A low-grade tungsten iron ore technology, applied in the field of tungsten extraction, can solve the problems of difficult to realize industrialization, complex leaching conditions, easy sintering of materials, etc., and achieve the effect of simplifying the leaching process, good material flow, and simplifying the process.

Active Publication Date: 2021-06-22
GANZHOU NONFERROUS METALLURGICAL RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of long process, complex operation, easy sintering of materials, complex leaching conditions and difficulty in industrialization when extracting tungsten from low-grade wolframite in the existing technology

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  • A method for extracting tungsten from low-grade wolframite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Weigh 100g of tungsten ore and pour it into an electromagnetic sample grinder. After processing, tungsten ore becomes powder with a particle size of about 100 μm. Add 0.20 times the amount of soda ash, 0.03 times the amount of magnesium chloride and 0.11 times the amount of sodium chloride , mix the auxiliary materials with the finely ground ore samples evenly, place them in a muffle furnace and heat them to 780°C, keep them warm for 60 minutes, and after cooling with the furnace, process them into a particle size of 100-150 μm with an electromagnetic sample preparation grinder. At 2 minutes and 45 seconds, ultrasonic water immersion, leaching in a water bath at 70°C for 45 minutes, the leaching liquid-solid ratio is 3:1 (mL / g), filtering and analyzing the silicon and phosphorus impurities in the filtrate, the result is Si: 8.21mg / L, P: 6.28 mg / L. The filter cake was stirred and washed once with 1.5 times of water, and the filter residue was weighed after drying, and th...

Embodiment 2

[0047] Weigh 100g of tungsten ore and pour it into an electromagnetic sample grinder. After processing, tungsten ore becomes powder with a particle size of about 100 μm. Add 0.22 times the amount of soda ash, 0.10 times the sodium chlorate and 0.05 times the magnesium chloride of the ore sample. , mix the auxiliary materials with the finely ground ore samples evenly, place them in a muffle furnace, heat them to 800°C, and keep them warm for 30 minutes. After 2 minutes and 30 seconds, add the tungsten-containing leaching solution of Example 1 for ultrasonic circulation leaching, dilute hydrochloric acid to fine-tune the pH to 9-10, and leaching for 30 minutes in a water bath at 75°C. The ratio of leaching liquid to solid is 3:1 (mL / g). The cake was stirred and washed once with 1.5 times of water, and the filter residue was weighed after drying, and the WO 3 content, and calculate the extraction rate of tungsten. The analysis result of filter residue is 0.14%, and the calculati...

Embodiment 3

[0052] Weigh 100g of tungsten ore and pour it into an electromagnetic sample grinder, process the tungsten ore into powder with a particle size of about 100μm, add 0.18 times the amount of soda ash, 0.12 times the sodium sulfate and 0.05 times the magnesium sulfate of the ore sample , mix the auxiliary materials with the finely ground ore samples evenly, place them in a muffle furnace, heat them to 850°C, and keep them warm for 45 minutes. At 1 minute and 45 seconds, ultrasonic water immersion, leaching in a water bath at 70°C for 60 minutes, the liquid-solid ratio of the leaching is 3:1 (mL / g), after filtration, the filter cake is stirred and washed once with 1.5 times of water, and the filter residue is dried and weighed. Sampling and analyzing the WO 3 content, and calculate the extraction rate of tungsten. The analysis result of filter residue is 0.15%, and the calculation method of tungsten extraction rate is =(1-m 2 ×ω 2 / m 1 ×ω 1 )×100%

[0053] where m 1 、m 2 R...

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Abstract

The invention discloses a method for extracting tungsten from low-grade tungsten ore. The tungsten ore powder is mixed with auxiliary materials to obtain a mixture, the mixture is roasted to obtain clinker, the clinker is leached with water, and solid-liquid separation is used to obtain a tungsten leachate. and leaching residue; the auxiliary material is composed of magnesium salt and alkali metal salt, and the alkali metal salt includes sodium carbonate. In the first invention of the present invention, without adding a carbon reducing agent, by adding a small amount of magnesium salt, the disintegration of the wolframite structure is realized. In the subsequent leaching process, tungsten is leached in the form of soluble tungstate. Not only that, the inventor also It was found that because no carbon reducing agent was added, on the one hand, during the roasting process, the reduction and decomposition of complex salts such as silicon, phosphorus, and iron can be avoided, and the formation of colloids is less. , Both of these two aspects can greatly reduce the impurity content in the leaching solution, and at the same time make it easier to finely grind the roasted clinker, filter more smoothly during leaching, and greatly reduce the difficulty of the process.

Description

technical field [0001] The invention relates to a method for extracting tungsten from low-grade wolframite, and belongs to the technical field of separation and enrichment of low-grade tungsten. Background technique [0002] In nature, there are more than 20 types of tungsten minerals that have been discovered, such as wolframite (Fe, Mn)WO 4 ), scheelite (CaWO 4 ), Tungsten China (WO 3 ·H 2 O), sulfur tungsten ore (WS 2 ), Wolframite (PbWO 4 )etc. Wolframite and scheelite are the main raw materials for industrial tungsten smelting. my country's tungsten reserves still rank first in the world, but with the over-exploitation of tungsten resources and the increase of tungsten consumption, the reserves of tungsten resources have decreased sharply, and many tungsten mine resources are close to exhaustion, which makes my country's tungsten industry face a severe shortage of raw tungsten. . From the perspective of endowment conditions of tungsten resources, current mining s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/08C22B1/06C22B3/04C22B34/36
CPCC22B1/06C22B1/08C22B3/04C22B34/36Y02P10/20
Inventor 郭春平文小强周有池刘雯雯王玉香袁德林普建
Owner GANZHOU NONFERROUS METALLURGICAL RES INST
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