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Method for comprehensively recycling tin and tungsten from high-tin-tungsten concentrates

A tin-tungsten and concentrate technology, applied in chemical instruments and methods, sulfur compounds, process efficiency improvement, etc., can solve the problems of increasing the difficulty of separation of tungsten and tin, low tin grade, etc., and reduce slag discharge and leaching. Cost, efficient processing effect

Active Publication Date: 2017-10-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, when tungsten is leached by the above series of methods, tin will inevitably enter the sodium tungstate solution, which increases the difficulty of separating tungsten and tin (the requirement for tin content in the tungsten product APT-0 is extremely strict, and the mass fraction is less than 1ppm, which needs to be increased A special tin removal process can ensure that the tin in APT does not exceed the standard)
In addition, the tin grade in the decomposition slag is not high (Sn<10%), and it is difficult to directly send it to the tin smelting process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] High tin tungsten concentrate (containing WO 3 35.7%, Sn 4.2%, K 0.68%) 100g, the molar ratio of the amount of gypsum to the total content of tungsten, tin and potassium in the mineral is 1.5:1. The air-to-coal ratio is controlled at 0.7, the blowing temperature is controlled at 1250°C, and the blowing time is 2 hours. The volatilization rate of tin is 98.6%. The way to get tin concentrate containing Sn45.2%. More than 98% of the particle size of the tungsten-containing slag crushing ball is passed through a 325 mesh sieve, and then leached by water. The liquid-solid ratio of the water leaching is 1:1, the water immersion temperature is 50°C, the water immersion time is 2 hours, and the K leaching rate is 82.1%. The filter residue after water immersion is decomposed by sulfuric acid and phosphoric acid. The liquid-solid ratio of sulfur-phosphorus mixed acid leaching is 4:1, the temperature is 80°C, the time is 4h, the concentration of sulfuric acid is 250g / L, the conc...

Embodiment 2

[0042] High tin tungsten concentrate (containing WO 3 35.7%, Sn 4.2%, K 0.68%) 100g, the molar ratio of the amount of gypsum to the total content of tungsten, tin and potassium in the mineral is 1:1. The air-to-coal ratio is controlled at 0.8, the blowing temperature is controlled at 1200°C, the blowing time is 0.5h, and the volatilization rate of tin is 97.1%. Dust way to get tin concentrate containing Sn48.3%. More than 98% of the particle size of the tungsten-containing slag crushing ball passes through a 325-mesh sieve, and then water leaching is used. The liquid-solid ratio of the water leaching is 3:1, the water immersion temperature is 30°C, the water immersion time is 4 hours, and the K leaching rate is 80.6%. The filter residue after water immersion is decomposed by sulfuric acid and phosphoric acid. The liquid-solid ratio of sulfur-phosphorus mixed acid leaching is 3:1, the temperature is 90°C, the time is 2h, the concentration of sulfuric acid is 300g / L, the conce...

Embodiment 3

[0044] High tin tungsten concentrate (containing WO 3 16.5%, Sn 8.9%, K 2.1%) 100g, the molar ratio of the amount of gypsum to the total content of tungsten, tin and potassium in the mineral is 3:1. The air-to-coal ratio is controlled at 0.9, the blowing temperature is controlled at 1300°C, and the blowing time is 4 hours. The volatilization rate of tin is 99.2%. The way to get tin concentrate containing Sn46.2%. More than 98% of the particle size of the tungsten-containing slag crushing ball is passed through a 325 mesh sieve, and then leached by water. The liquid-solid ratio of the water leaching is 1:1, the water immersion temperature is 60°C, the water immersion time is 1h, and the K leaching rate is 93.6%. After water immersion, the filter residue is decomposed by sulfuric acid and phosphoric acid. The liquid-solid ratio of sulfur-phosphorus mixed acid leaching is 6:1, the temperature is 60°C, the time is 6h, the concentration of sulfuric acid is 50g / L, the concentratio...

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Abstract

The invention discloses a method for comprehensively recycling tin and tungsten from high-tin-tungsten concentrates. The method comprises the steps that firstly, evenly-mixed high-tin-tungsten concentrates and vulcanizing agent gypsum are added into a fuming furnace for blowing; the furnace temperature and atmosphere are controlled by adjusting the coal-air ratio of the furnace; in the blowing process, tin volatilizes in a SnS gas manner to enter dust-containing flue gas, and the high-temperature dust-containing flue gas enters a settling chamber; and the high-grade tin concentrates are obtained in an electric dust collection manner, tungsten enters furnace slag, and the furnace slag is used for recycling tungsten. The method has the beneficial effects that tin is preferentially recycled through sulfidization of the fuming furnace, the tin recycling rate is greatly increased, and efficient separation of tungsten and tin is achieved; conversion of black tungsten into white tungsten in associated ore is achieved, and subsequent tungsten efficient extraction is facilitated; meanwhile, associated potassium-containing minerals are decomposed and can be removed through washing, and therefore the impurity removal pressure in the subsequent tungsten APT extraction and preparation process is relieved; generated gypsum residues are cyclically utilized, and residue discharge is reduced; and SO2-containing flue gas discharged in the fuming process is absorbed and prepared into sulfuric acid to be used for a subsequent tungsten leaching agent, and leaching cost is reduced.

Description

technical field [0001] The invention relates to the extraction of metal tungsten and tin in the field of hydrometallurgy, in particular to a method for comprehensively recovering tin and tungsten from high-tin tungsten concentrates. Background technique [0002] Tungsten is mainly enriched in the contact metamorphic zone of granite in the form of tungstate in the crust, and it is more or less symbiotic with tin-bearing minerals in many tungsten deposits, especially porphyry tungsten deposits-this type of tungsten-containing polymetallic sulfide There are many associated tin-containing minerals such as cassiterite in the ore. For example, the associated tin resources in the Shizhuyuan tungsten polymetallic ore body have a metal reserve of 460,000 tons, but the grade of the associated tin in the original ore is only 0.1-0.12%, and 60% of the associated tin is colloidal tin-like minerals, which can be floated. The property is poor, and the comprehensive utilization is difficul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/36C22B25/06C22B25/02C01B17/74C01F11/46
CPCC01B17/74C01F11/46C22B25/02C22B25/06C22B34/36Y02P10/20
Inventor 李江涛赵中伟
Owner CENT SOUTH UNIV
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