Method for extracting tungsten from tungsten-containing sodium carbonate solution and comprehensive utilization of extracted liquid

A technology of sodium carbonate and solution, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of low cost, large discharge of waste water and waste salt, etc., and achieve the effect of reducing waste water discharge and reducing the discharge of waste water and waste salt

Active Publication Date: 2017-03-01
CENT SOUTH UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can not only solve the problem of large amount of waste water and salt discharge in the existing alkaline tungsten smelting system, but also has good comprehensive economic benefits and lower cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The sodium carbonate solution containing tungsten used is a solution containing WO 3 4% tungsten-containing waste residue, the leachate obtained after high-pressure leaching with sodium carbonate, the leachate contains WO 3 40g / L, containing Na 2 CO 3 60g / L.

[0034] 1) Take 2M 3 The tungsten-containing leachate was slowly added with 98% concentrated sulfuric acid to pH=3 while stirring to obtain 2.06M 3 The pre-exchange solution is then passed through an ion-exchange column of Φ0.6m×1.8m and a height-to-diameter ratio of 3:1 equipped with 400L macroporous weakly basic anion-exchange resin (D301, the functional group is a tertiary amino group) at room temperature. The ion exchange column adopts a steel-lined polypropylene anti-corrosion structure, which can withstand a positive pressure of 0.5MPa, and the outer wall is equipped with a steam heating jacket. The flow rate of the feed liquid is 3L / min, and the contact adsorption time between the feed liquid and the...

Embodiment 2

[0043] The sodium carbonate solution containing tungsten used is a solution containing WO 3 40% scheelite is leached by high-pressure sodium carbonate, and the leachate contains WO 3 120g / L, containing Na 2 CO 3 160g / L.

[0044] 1) Take 2M 3 The tungsten-containing leachate was slowly added with 98% concentrated sulfuric acid to pH=5.5 while stirring to obtain 2.18M 3 The pre-exchange liquid is then transferred to the agitated tank with steam jacket heating, airtight and positive pressure resistance of 900L macroporous weakly basic anion exchange resin (D309, functional group is primary amino group), and then the pre-exchange liquid is stirred. The tank is made of steel-lined plastic, and the drain port at the bottom of the stirring tank is equipped with a water cap to prevent the ion exchange resin from being discharged together with the solution. Control the stirring speed to 60 rev / min, stir and adsorb at 50°C for 4 hours, the WO 3 reduced to 0.09g / L, the adsorptio...

Embodiment 3

[0051] The tungsten-containing sodium carbonate solution used is WO-containing 3 26% scheelite is leached by high-pressure sodium carbonate, and the leachate contains WO 3 92g / L, containing Na 2 CO 3 124g / L.

[0052] 1) Take 2M 3 The tungsten-containing leachate was slowly added with 98% concentrated sulfuric acid while stirring until pH = 4.0 to obtain 2.13M 3 Pre-delivery solution. Primary adsorption: Transfer the pre-exchange liquid into a heated, airtight, and positive pressure-resistant 1-cycle chamber equipped with 500L macroporous weakly basic anion exchange resin (D309, the functional group is a primary amino group). # In the stirring tank, the material of the stirring tank is 316L stainless steel, and the drain port at the lower part of the stirring tank is equipped with a stainless steel metal mesh to prevent the ion exchange resin from being discharged together with the solution. The stirring speed is 60 rev / min, and after stirring and adsorbing at 25°C for...

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Abstract

The invention provides a method for extracting tungsten from a tungsten-containing sodium carbonate solution and comprehensively utilizing an extracted solution. The method comprises the following steps of firstly, adsorbing tungsten in the tungsten-containing sodium carbonate solution by using ion exchange resin to obtain an exchanged solution and negative tungsten resin, and desorbing the negative tungsten resin under the closed condition of 40 to 60DEG C by using ammonia water; secondly, carrying out ball milling and size mixing on barium carbonate and part of exchanged solution; thirdly, slowly adding size obtained by ball milling into a stirring tank which is filled with residual exchanged solution and starts stirring, and stirring at the temperature of 60 to 90DEG C for 4 to 10 hours; fourthly, passivating barium sulfate: carrying out ball milling and size mixing on a filter cake obtained in the third step and a proper amount of water in a ball mill, then mixing with a sulfuric acid solution, stirring for 4 to 10 hours, then filtering, and washing the filter cake with deionized water to obtain a barium sulfate product. According to the method provided by the invention, the discharging amounts of waste water and waste salts in tungsten metallurgy are greatly reduced, and 50 percent or over 50 percent of sodium carbonate is recovered; meanwhile, the barium sulfate product with a higher added value is obtained, and significant comprehensive economic benefits are obtained.

Description

technical field [0001] The invention belongs to the technical field of mineral hydrometallurgy, and in particular relates to a method for extracting tungsten from tungsten-containing ores and comprehensively utilizing the extracted liquid. Background technique [0002] Tungsten is a rare metal with a high melting point, and is widely used in cemented carbide, high specific gravity alloy, tungsten wire and steelmaking. The mineral raw materials used to extract tungsten mainly include scheelite, wolframite, black and white tungsten mixed ore, etc. [0003] In order to extract tungsten from tungsten minerals, the current tungsten metallurgy industry in my country mostly adopts alkaline smelting system, as disclosed in patent CN86108390A: through NaOH or Na 2 CO 3 The method of high pressure leaching decomposes tungsten minerals to obtain tungsten-containing NaOH or Na 2 CO 3 leachate, and then dilute the leachate to contain WO 3 10-25g / L solution, and then use strong basi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/36C01F11/46
Inventor 霍广生黄铭谦朱诗宇何亚明朱和平
Owner CENT SOUTH UNIV
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