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Method for decomposing scheelite by using phosphoric acid

A technology of phosphoric acid decomposition and scheelite, which is used in the extraction of rare high melting point metal tungsten and the field of phosphoric acid decomposition of scheelite. It can solve problems such as unseen industrial applications, save the cost of phosphorus removal reagents and tungsten loss, and simplify operations. , the effect of saving resources and energy consumption

Active Publication Date: 2011-04-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the corrosion and volatilization of hydrochloric acid are still a headache, so although there are research reports, there is no industrial application

Method used

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  • Method for decomposing scheelite by using phosphoric acid

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Experimental program
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Effect test

Embodiment 1

[0029] Scheelite (including WO 3 70.6%) 1kg, solid-to-liquid ratio with phosphoric acid solution 1:10g / ml, P in phosphoric acid solution 2 o 5 The content is 20%, the reaction temperature is 90°C, and the reaction time is 4h. The leaching rate of tungsten is 98.9%. The XRD pattern of the filter residue is as follows figure 1 , indicating that phosphorus is mainly in the form of Ca(H 2 PO 4 ) 2 ·H 2 The form of O is lost in the filter residue. Add 50g of phosphate rock (P 2 o 5 content is 25%), adopt sulfuric acid to decompose and reclaim phosphoric acid, the XRD pattern of solid product is as follows figure 2 , indicating that the filter residue is mainly transformed into CaSO after being treated with sulfuric acid 4 2H 2 O, P in the analyzed product 2 o 5 When the content is only 0.6%, the phosphorus enters the solution and is recovered. The filtrate is adsorbed by primary amino anion exchange resin, and the adsorption rate of tungsten is 99.3%. During the ex...

Embodiment 2

[0031] Scheelite (including WO 3 70.6%) 1kg, solid-to-liquid ratio with phosphoric acid solution 1:15g / ml, P in phosphoric acid solution 2 o 5 The content is 30%, the reaction temperature is 100°C, and the reaction time is 2h. The leaching rate of tungsten is 99.1%. After the filter residue is decomposed with sulfuric acid to recover phosphoric acid, the P in the residue 2 o 5The content was reduced to 0.7%. The filtrate is adsorbed by secondary amine-based anion exchange resin, and the adsorption rate of tungsten is 98.9%. The total loss of phosphorus in the extraction process is 4.3%, and the mother liquor returns to leaching after adding the lost phosphoric acid.

Embodiment 3

[0033] Scheelite (including WO 3 70.6%) 1kg, solid-to-liquid ratio with phosphoric acid solution 1:20g / ml, P in phosphoric acid solution 2 o 5 The content is 10%, the reaction temperature is 60°C, and the reaction time is 10h. The leaching rate of tungsten is 98.6%. After the filter residue is decomposed with sulfuric acid to recover phosphoric acid, the P in the residue 2 o 5 The content was reduced to 0.9%. The filtrate is adsorbed by a tertiary amine-based anion exchange resin, and the adsorption rate of tungsten is 98.4%. During the extraction process, phosphorus is lost in the form of phosphotungstic heteropolyacid and the total amount of entrainment loss is 4.6%.

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Abstract

The invention discloses a method for decomposing scheelite by using phosphoric acid, and the specific operation is as follows: adding the scheelite and phosphoric acid solution into a reaction tank for reaction according to a certain proportion, extracting tungsten from filtrate obtained by filtering after the reaction is finished, further supplementing the phosphoric acid into mother liquor after extracting the tungsten to the initial level, returning for leaching, decomposing filter residue obtained by filtering after the reaction by adopting sulfuric acid so as to recover the phosphoric acid or return the phosphoric acid for recycling. The method has the advantages of having no strict requirement on phosphorus content in the scheelite and eliminating the cost of dephosphorization process step during the ore dressing process; the post-treatment way of extracting the tungsten after the reaction is simple, the remaining solution can be recycled basically, and the pollution can be avoided; the problems of corrosion of Cl- and serious volatilization of HCl (hydrochloric acid) in the traditional acid decomposition process can be overcome; and the normal-pressure leaching of the scheelite can be realized, the energy consumption can be saved, and the decomposition rate can be more than 98%.

Description

technical field [0001] The invention relates to the extraction of rare high-melting-point metal tungsten in the field of hydrometallurgy, in particular to a method for decomposing scheelite with phosphoric acid. Background technique [0002] Tungsten ore is mainly composed of scheelite deposits. The world's scheelite reserves account for more than 2 / 3 of the total reserves, and my country accounts for 72.1%. [0003] The process of decomposing scheelite mainly includes alkali decomposition process and acid decomposition process. [0004] The soda decomposition method is a mature alkaline process, which can process both scheelite concentrate and middling ore, and is widely used abroad. When soda decomposes, the calcium in scheelite combines with carbonate to form calcium carbonate CaCO 3 Into the decomposition slag, tungstate forms sodium tungstate Na 2 WO 4 into solution. However, due to the small thermodynamic driving force for the decomposition of soda, the amount of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/06C22B34/36
CPCY02P10/20
Inventor 赵中伟李江涛
Owner CENT SOUTH UNIV
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