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Method of producing sodium tungstate solution using scheelite powder as raw material

A technology for the production of sodium tungstate and tungsten ore powder, applied in the direction of improving process efficiency, etc., can solve the problems of low decomposition rate of scheelite concentrate and effective utilization of resources, high requirements for corrosion resistance, and influence on smooth progress, etc. To achieve the effect of wide adaptability of raw materials, good product quality and high effective utilization rate

Inactive Publication Date: 2003-11-12
ZIGONG CEMENTED CARBIDE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, this technology also has low decomposition rate of scheelite concentrate and low effective utilization rate of resources, high alkalinity and high viscosity of slurry, difficult filtration, and WO in slag. 3 The content is as high as 1.5 to 2.5%, which is 1 to 12 times higher than the grade of the raw material ore. The corrosion resistance of the equipment is high, the service life is short, the production cost is high and Na 2 WO 4 The high concentration of free alkali in the solution seriously affects the smooth progress of subsequent operations and other disadvantages

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] This embodiment uses scheelite concentrate powder as raw material:

[0018] A. Ingredients: the particle size ≤ 45μm, which contains WO 3 : 70.61%, SiO 2 : 2.86% scheelite concentrate 1500g after pulping, add NaOH under stirring state: 566g (WO 3 1.55 times the theoretical amount), 85% of H 3 PO 4 : 358g, Al with a particle size of 74μm 2 o 3 : 20g, NaNO 3 : 15g, and the slurry density is adjusted to 1.58, and the alkalinity 105g / l makes the slurry of volume 3000ml;

[0019] B. Decomposition treatment: put the above slurry in a reaction kettle with a volume of 5000ml and a stirrer, stir and react at a speed of 100r.p.m at 165°C and a pressure of 0.6MPa for 2 hours, then cool to room temperature;

[0020] C. Filtration and separation: the above-mentioned decomposition treatment and slurry cooled to normal temperature are placed in a vacuum filter and filtered to obtain 2100mlNa 2 WO 4 solution, WO in solution 3 Content 410g / l, free NaOH42g / l, SiO 2 : 0.12g / l, ...

Embodiment 2

[0022] The present embodiment takes 1500g black and white mixed tungsten ore powder as raw material, wherein black tungsten accounts for 20%, scheelite 80% (WO 3 : 69.8%, SiO 2 : 3.1%).

[0023] A. Add WO to the slurry 3 1.45 times the theoretical amount of NaOH: 523g: 85% H 3 PO 4 : 288g, slurry density 1.60, basicity 158g / l, all the other are the same as embodiment 1, get 3000ml slurry;

[0024] B. The decomposition treatment temperature is 160°C, the pressure is 0.5MPa, and the treatment time is 2.5 hours;

[0025] C, the above-mentioned slurry is filtered with temperature and pressure into a vacuum filter to obtain 2250mlNa 2 WO 4 solution, WO in solution 3 Content 380g / l, free NaOH content 38g / l, SiO 2 Content 0.14g / l, P content 0.25g / l; drying slag weight 668g, insoluble WO in slag 3 The content is 0.35%, and the decomposition rate is 99.8%.

Embodiment 3

[0027] The present embodiment uses 1500g middle grade scheelite powder (WO 3 : 45.0%, SiO 2 : 8%) is raw material, and its process parameter is:

[0028] Add 1.5 times the theoretical amount of NaOH to the raw material slurry: 372g, 85% H 3 PO 4 : 257g, Al 2 o 3 : 75g, slurry density 1.59, alkalinity 110g / l, get 3000ml slurry, the rest and decomposition treatment etc. are all the same as

[0029] Embodiment 1 is the same;

[0030] 1850mlNa was separated by filtration 2 WO 4 Solution, the slag liquid contains WO 3 : 370g / l, P content 0.47g / l, SiO 2 Content: 0.08g / l, dry weight of filter residue after washing is 1109g, WO in residue 3 It is 0.15%, and the decomposition rate is 99.75%.

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Abstract

The present invention belongs to a method for producing sodium wolframate solution by using calcium-containing wolfram ore powder, and said method includes the following steps: adding NaOH and P3PO4 into the raw material ore powder WO3 and CaWO4 in low duplication of Ca cotained in the above-mentioned raw material ore powder and a certain quantity of Al2O3 and NaNO3 to make them into slurry material, under the condition of 0.4-0.9 MPa and 140-180 deg.C stirring them and making decomposition treatment for 2-3 hr., filtering, separating and washing residue to obtain the invented product sodium wolframate solution. Said invention is high efficiency and its product quality is good.

Description

technical field [0001] The invention belongs to a production method for preparing sodium tungstate solution from calcium-containing tungsten ore powder, in particular to a method for producing sodium tungstate solution by adopting low pressure, low alkali and thermal decomposition. The method is especially suitable for producing sodium tungstate solution from scheelite, black and scheelite mixed ore and high-molybdenum scheelite as raw materials, and provides intermediate products for further production of tungsten products. Background technique [0002] In the patent document whose publication number is CN1361296A, the name is called "High Calcium Tungsten Mineral Pressure Cooking Decomposition Method", it is disclosed that a kind of tungsten mineral (powder) containing high calcium is pressurized and heated ( That is, the method of decomposition by pressurized alkali boiling) to realize the scheelite (CaWO 4 ) and other calcium-tungsten minerals. Although this method ove...

Claims

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Application Information

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IPC IPC(8): C22BC22B3/06
CPCY02P10/20
Inventor 赵本福肖新志董旭彪
Owner ZIGONG CEMENTED CARBIDE CORP
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