Beneficiation method for low grade scheelite

A beneficiation method and scheelite technology, applied in flotation, solid separation and other directions, can solve the problems of inability to disperse and suppress, inability to separate tungsten ore, and difficult to separate, so as to reduce the content of gangue, The effect of reducing the difficulty of drug removal and stabilizing the selection index

Active Publication Date: 2018-11-02
ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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Problems solved by technology

[0003] In recent years, with the rapid development of social economy, the demand for tungsten metal has become stronger and stronger, and people have to develop and utilize some lower-grade tungsten ores, but the gangue minerals of these low-grade tungsten ores contain a large amount of Gypsum, montmorillonite, saponite and other impurity minerals, for example: the content of tungsten trioxide in the raw ore of low-grade tungsten ore in a certain place in northern my country is only 0.05-0.25%, the main gangue mineral content is 5-10% gypsum, carbon Salt 30-50%, serpentine 12-18%, montmorillonite 6-10%, resulting in extremely difficult sorting of this type of low-grade tungsten ore
The traditional conventional scheelite sorting process and chemical system usually use calcium ions dissolved in gypsum in the sodium carbonate consumption solution, add water glass to disperse clay minerals and suppress carbonate minerals, but because low-grade tungsten ore contains a large amount of gypsum , carbonate minerals and clay minerals, with the addition of sodium carbonate and water glass, will preferentially produce calcium carbonate and calcium silicate precipitation with calcium ions in the solution, and the calcium ions in the pulp will decrease. According to the principle of dissolution balance, gypsum will continue to dissolve , producing a larger amount of calcium ions, resulting in a large amount of sodium carbonate consumption, and water glass is also consumed by the calcium ions continuously dissolved by gypsum, which cannot play the role of dispersion and inhibition, resulting in extremely poor sorting effect
Therefore, this type of ore is basically shelved or selected as a blending ore, resulting in waste of resources
[0004] It can be seen from the above that the conventional technological process and chemical system cannot be used to sort low-grade tungsten ores containing a large amount of gypsum, montmorillonite, carbonate, saponite and other minerals

Method used

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  • Beneficiation method for low grade scheelite
  • Beneficiation method for low grade scheelite

Examples

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preparation example Construction

[0056] Preferably, the preparation method of the calcium and magnesium ion-resistant scheelite collector comprises the following steps:

[0057] (1) Heat the industrial oil residue to 60°C and stir for 30 minutes, then add sulfuric acid with a dilution concentration of 30%, and the dosage is 12%;

[0058] (2) Continue to stir and react for 50min, leave standstill, and remove the impurities in the lower layer after layering;

[0059] (3) Pass into reaction system 13% chlorine gas of industrial grease by-product quality and continue stirring reaction 70min, add lye solution to neutralize reaction system;

[0060] (4) Add the surfactant alkylphenol polyoxyethylene ether of 4% of the total mass of the system, stir evenly and then add 25% sodium hydroxide with a concentration of 14% of the total mass of the system to stir;

[0061] (5) Dilute the reaction system with water to a mass fraction of 5% to obtain a calcium and magnesium ion-resistant scheelite collector.

[0062] Where...

Embodiment 1

[0103] In this example, the low-grade scheelite contains 0.13% tungsten trioxide, 5.2% gypsum, 35% carbonate, 15% serpentine and 8% montmorillonite as main gangue minerals.

[0104] A method for beneficiating low-grade scheelite, the method specifically includes the following steps:

[0105] (a): adding sodium carbonate, water glass and tungsten collector to the low-grade scheelite with a particle size of 10 μm in sequence, stirring for 8 minutes, and then performing flotation to obtain roughing concentrate a and roughing tailings;

[0106] The add-on of described sodium carbonate is 2000g / t, and the add-on of water glass is 2000g / t, and the add-on of tungsten collector is 300g / t;

[0107] (b): The rougher tailings obtained in step (a) are subjected to 2 times of flotation with a calcium and magnesium ion-resistant scheelite collector to obtain the rougher concentrate b, and the rougher concentrate b and the step (a) are The rougher concentrate a is combined to obtain the rou...

Embodiment 2

[0118] In this embodiment, the low-grade scheelite contains 0.17% tungsten trioxide, 5% gypsum, 30% carbonate, 18% serpentine and 5% montmorillonite as main gangue minerals.

[0119] A method for beneficiating low-grade scheelite, the method specifically includes the following steps:

[0120] (a): adding sodium carbonate, water glass and tungsten collector to the low-grade scheelite with a particle size of 100 μm in sequence, stirring for 8 minutes, and then performing flotation to obtain roughing concentrate a and roughing tailings;

[0121] The add-on of described sodium carbonate is 1500g / t, and the add-on of water glass is 1500g / t, and the add-on of tungsten collector is 300g / t;

[0122] (b): The rougher tailings obtained in step (a) are subjected to 3 times of flotation with a calcium-magnesium ion-resistant scheelite collector to obtain the rougher concentrate b, and the rougher concentrate b and the step (a) are The rougher concentrate a is combined to obtain the rough...

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Abstract

The invention provides a beneficiation method for low grade scheelite and relates to the technical field of raw material ore separation. The method is a grading method of recovering white tungsten from low grade scheelite containing impurities such as 5-10%of gypsum, 30-50% of carbonate and 15-30% of clay minerals. The method specifically comprises the following steps: first, obtaining rough concentrate with a relatively high recovery rate by adopting sodium carbonate, water glass and a tungsten collecting agent; then pre-treating the rough concentrate to obtain primary concentrate with a relatively high grade; and finally, concentrating the primary concentrate at 60-70 DEG C to obtain the white tungsten concentrate. According to the beneficiation method provided by the invention, the feeding grade of white tungsten before concentration can be improved obviously, the ore feeding amount for concentration is reduced, and the obtained final white tungsten concentrate is relatively high ingrade and recovery rate. The method has the advantages of being simple in process flow and stable in grading index and related flotation reagents are wide in source of raw materials and low in price.

Description

technical field [0001] The invention relates to the technical field of raw material ore separation, in particular to a method for beneficiating low-grade scheelite. Background technique [0002] Tungsten is the metal with the highest melting point and is an important strategic material widely used in the steel industry and electric vacuum lighting materials. At present, my country is rich in tungsten resources, mainly scheelite, but most scheelite ores are complex in nature, low in grade, with many associated minerals, and difficult to recycle. Especially for scheelite whose gangue minerals contain impurity minerals such as gypsum, montmorillonite and saponite, it is more difficult to sort. [0003] In recent years, with the rapid development of social economy, the demand for tungsten metal has become stronger and stronger, and people have to develop and utilize some lower-grade tungsten ores, but the gangue minerals of these low-grade tungsten ores contain a large amount o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B9/00B03D1/00B03D103/02
CPCB03B9/00B03D1/00B03D2203/02
Inventor 邵伟华常学勇刘广学彭团儿张艳娇方浩
Owner ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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