Method for comprehensively recovering tungsten and phosphorus from high phosphorus white tungsten ores

A scheelite and high-phosphorus technology, which is applied in the direction of phosphorus compounds, chemical instruments and methods, and process efficiency improvement, can solve the problems of increasing leaching costs and wastewater treatment pressure, so as to reduce leaching costs and wastewater discharge, and reduce The effect of leaching costs

Active Publication Date: 2011-06-01
CENT SOUTH UNIV
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Problems solved by technology

But this will greatly increase the cost of lea

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Scheelite (including WO 3 15.8%, P 2 o 5 25.6%) 1kg, the initial SO in the leaching solution 4 2- The concentration is 0.2g / ml, P 2 o 5 The content is 30%, the liquid-solid ratio is 5:1ml / g, and the reaction temperature is 70°C. After 4 hours of reaction, the leaching rate of tungsten and phosphorus is 98.8% and 98.5%. At this time, the SO in the filtrate 4 2-Concentration dropped to 0.11g / ml, P 2 o 5 The content is 35.2%. This solution is used to continue leaching 1kg of high-phosphorus tungsten ore. The temperature is controlled at 100°C. After 4 hours of reaction, the leaching rate of tungsten and phosphorus is 98.6% and 98.1%. The obtained P in the solution analyzed at this time 2 o 5 The content is 40.1%. The filtrate adopts secondary amino anion exchange resin to adsorb tungsten, and the adsorption rate of tungsten is about 99.7%. The solution after extracting tungsten uses 90% TBP + 10% kerosene extractant to extract phosphoric acid, the ratio is 1:1...

Embodiment 2

[0028] Scheelite (including WO 3 15.8%, P 2 o 5 25.6%) 1kg, the initial SO in the leaching solution 4 2- The concentration is 0.3g / ml, P 2 o 5 The content is 10%, the liquid-solid ratio is 10:1ml / g, the reaction temperature is 50°C, and the reaction time is 6h. The leaching rate of tungsten is 98.7%, and the leaching rate of phosphorus is 98.1%. Add sulfuric acid to SO 4 2- After the concentration is 0.2g / ml, return to a new cycle of high phosphorus tungsten ore leaching operation.

Embodiment 3

[0030] Scheelite (including WO 3 15.8%, P 2 o 5 25.6%) 1kg, SO in circulating leachate 4 2- The concentration is 0.05g / ml, P 2 o 5 The content is 35%, the liquid-solid ratio is 6:1ml / g, the reaction temperature is 120°C, and the reaction time is 6h. The leaching rate of tungsten was 98.6%, and the leaching rate of phosphorus was 98.0%. At this time, the P in the solution was analyzed 2 o 5 The content is 39.1%. The filtrate adopts primary amino anion exchange resin to adsorb tungsten, and the adsorption rate of tungsten is about 99.2%. The solution after extracting tungsten uses 90% TBP + 10% kerosene extractant to extract phosphoric acid, the ratio is 1:1, the temperature is 40 ° C, after extraction for 15 minutes, analyze the P in the solution 2 o 5 The content is reduced to 29.8%, and the equivalent extraction rate is about 24%. 2 o 5 The phosphoric acid content is 28.9%. The raffinate was supplemented with sulfuric acid to SO 4 2- After the concentration is...

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Abstract

The invention discloses a method for receiving tungsten and phosphorus from high phosphorus white tungsten ores, which comprises: decomposing the ores by using mixed acid of phosphoric acid and sulfuric acid, wherein phosphorus-containing ore are converted into phosphoric acid, tungsten-containing ore are converted into phosphotungstic acid, and both the phosphorus and the tungsten enter solution; when the total P2O5 mass content in circular leaching filtrate surpasses 30 percent, extracting tungsten from the circular leaching filtrate, extracting phosphoric acid by using a solvent extraction method, reducing P2O5 mass content in the circular leaching filtrate by controlling the extraction rate of phosphoric acid, resupplying sulfuric acid, and returning to newly leached high phosphorus white tungsten ores; and thus, recovering tungsten and phosphoric acid from the leaching filtrate respectively. The method has the advantages of comprehensively recovering tungsten and phosphorus from ores, lowering requirements on tungsten ore raw material, reducing pressure in ore dressing step, ensuring over 98 percent decomposition rate of the white tungsten ore, recycling leaching agent, greatly reducing leaching cost and waste water discharge, along with simple leaching equipment, convenient operation and easy industrialization implementation.

Description

technical field [0001] The invention is a method for comprehensively recovering tungsten and phosphorus from high-phosphorus scheelite. Background technique [0002] The tungsten industry is my country's dominant industry. my country's tungsten resource reserves rank first in the world, and its output and export volume also ranks first. [0003] However, for a long time, the tungsten ore resources consumed in our country are mainly black tungsten ore (easy to smelt, and the output accounts for more than 90%). In addition, most of the newly discovered tungsten resources are scheelite resources. At present, scheelite has an absolute advantage. situation. According to statistics in 2007, my country's existing basic reserves of tungsten ore are 2,408,600 tons, of which 1,737,000 tons of scheelite accounts for 72.1%, 491,300 tons of wolframite accounts for only 20.4%, and the rest is 180,300 tons of mixed tungsten ore, accounting for 7.5%. According to the current domestic mini...

Claims

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Application Information

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IPC IPC(8): C22B34/36C22B3/06C01B25/222
CPCY02P10/20
Inventor 赵中伟李江涛
Owner CENT SOUTH UNIV
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