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Molybdenum-tungsten separating process for molybdenum-tungsten mixed ammonium salt solution in tungsten hydrometallurgy

A technology of ammonium salt solution and solid-liquid separation, applied in the direction of improving process efficiency, etc., can solve problems such as difficulty in filtration, and achieve the effect of coarse and regular crystal structure

Inactive Publication Date: 2013-01-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technology of selectively precipitating copper thiomolybdate (CN1203279), which is widely used in industry, is only suitable for the treatment of ammonium tungstate solutions with a molybdenum concentration below 2g / l. The solution containing high molybdenum is restricted by extremely difficult filtration and cannot be implemented. , In addition, the recovery of valuable metals from sediments is an unresolved new issue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The raw material liquid is molybdenum and tungsten mixed ammonium salt solution recovered by ion exchange method, wherein WO 3 4.31g / l, Mo23.52g / l, with (NH 4 ) 2 S solution as vulcanizing agent, S 2- The ion excess coefficient is 1.03, vulcanized at room temperature for 48 hours, left to crystallize at +4°C for 24 hours, and the concentration of molybdenum in the mother liquor is 4.85g / l, and the molybdenum crystallization rate is 71.06%.

Embodiment 2

[0024] Raw material liquid and vulcanization process parameter are the same as embodiment 1, add solid ammonium chloride as salting-out agent, and its addition is that every liter of solution adds 1.0molNH 4 Cl, the sulfidation solution was crystallized at +4°C for 18 hours, the molybdenum concentration in the mother liquor was 2.22g / l, and the molybdenum crystallization rate was 86.75%.

Embodiment 3

[0026] Alkaline tungsten stripping solution, WO 3 163.49g / l, Mo 6.55g / l, adding high-concentration ammonium molybdate solution, formulated to contain WO 3 151.38g / l, the ammonium tungstate solution of Mo 22.42g / l is the raw material solution, with (NH 4 ) 2 S solution as vulcanizing agent, S 2- The ion excess coefficient is 1.09, vulcanized at room temperature for 48 hours, standing at +4°C for 39 hours to crystallize, the concentration of molybdenum in the mother liquor is reduced to 4.81g / l, and the crystallization rate of molybdenum is 69.75%.

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Abstract

The invention discloses a molybdenum-tungsten separating process for a molybdenum-tungsten mixed ammonium salt solution in tungsten hydrometallurgy and relates to the molybdenum-tungsten separating process for cooling and crystallizing an ammonium tungstate solution from high-concentration molybdenum to separate out tetrathio ammonium molybdate. The ammonium tungstate solution is subjected to sulfo-treatment, so that the molybdenum in the solution preferably generates the tetrathio ammonium molybdate. Under the condition of no addition of any chemical agent, the temperature of the solution isproperly reduced; and by standing or mechanical stirring, majority of molybdenum is separated out in a (NH4)2MoS4 crystal form without separating out the tungsten, thereby achieving the effects of effectively separating and recycling the molybdenum from the ammonium tungstate solution.

Description

technical field [0001] The invention belongs to a tungsten hydrometallurgy process, in particular to a molybdenum and tungsten separation process after the low-grade tungsten mineral raw material with high molybdenum is converted into a molybdenum-tungsten mixed ammonium salt solution. Background technique [0002] At present, high-quality tungsten concentrates are far from meeting the needs. In order to expand smelting raw materials, some low-grade tungsten mineral raw materials that were originally difficult to smelt and contain high molybdenum have attracted widespread attention, such as Luanchuan high-phosphorus, high-molybdenum scheelite, medium-low ore WO 3 The grade is generally below 25%, Mo and WO 3 The mass ratio is as high as 10%, and it is useless to prepare qualified concentrates by traditional mineral processing methods, and it is quite difficult to directly smelt them. The key is how to effectively separate high-content molybdenum and rationally recycle molybd...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/44C22B34/36C22B34/34
CPCY02P10/20
Inventor 肖连生龚柏藩王娜张启修张贵清
Owner CENT SOUTH UNIV
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