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Method for extracting tungsten from tungsten-containing raw material through waste glass

A technology for waste glass and raw materials, applied in the field of tungsten smelting, can solve the problems of difficult to exceed 95% tungsten recovery rate, poor mass and heat transfer effect of quartz, low tungsten leaching rate, etc., achieving low cost, low cost and good treatment effect. Effect

Active Publication Date: 2019-03-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, calcium and magnesium minerals are often contained in roasted materials, such as scheelite and sodium carbonate / sodium hydroxide roasting will produce calcium oxide; and scheelite, wolframite or tungsten slag often contain calcite (Ca 2 CO 3 ), magnesite (Mg 2 CO 3 ) and dolomite (CaMg(CO 3 ) 2 ), calcium oxide and magnesium oxide will also be produced during the roasting process, these calcium oxide and magnesium oxide will dissolve calcium and magnesium ions and sodium tungstate to form calcium tungstate and magnesium tungstate precipitation during the water leaching process, resulting in the leaching rate of tungsten Not high, as shown in Equations 1 and 2
Usually, calcium-magnesium ions are fixed by adding quartz to convert calcium-magnesium minerals into calcium silicate and magnesium silicate, as shown in reaction equations 3 and 4, but quartz has poor mass and heat transfer effects and a high melting point, usually The recovery rate of tungsten is difficult to exceed 95%

Method used

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  • Method for extracting tungsten from tungsten-containing raw material through waste glass
  • Method for extracting tungsten from tungsten-containing raw material through waste glass
  • Method for extracting tungsten from tungsten-containing raw material through waste glass

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Take a WO 3 Grind scheelite concentrate with a content of 50.1% to less than 74 μm, and another soda-calcium-silica waste glass to grind it to less than 74 μm, and grind the materials according to the ratio of scheelite concentrate:waste glass:sodium carbonate=1:0.2 The mass ratio of :1 is fully mixed, roasted at 700°C for 30 minutes, and the roasted material is ground to less than 74 μm and put into water for leaching. According to the liquid-solid ratio of 2:1, the leaching temperature is 50°C, and the leaching stirring time is 30 minutes. A tungsten-containing leaching solution with a leaching rate of 99.6% can be obtained.

Embodiment 2

[0030] Take a WO 3 The low-grade wolframite concentrate with a content of 35.8% is ground to less than 74 μm, and another high-silica waste glass is ground to less than 74 μm, and the ground material is ground according to wolframite concentrate: waste glass: sodium hydroxide: The ratio of sodium nitrate=1:0.1:0.6:0.1 is fully mixed. Since wolframite contains divalent iron elements, the oxygen released during the roasting process of sodium nitrate can convert it into ferric iron with higher reactivity, so Sodium nitrate is needed as a combined sodium source, roasted at 450°C for 40 minutes, the roasted material is ground to less than 74μm, and then put into water for leaching. According to the liquid-solid ratio of 4:1, the leaching temperature is 80°C, the leaching stirring time is 40 minutes, and the leaching rate is obtained by filtration. 99.8% of leachate, WO in slag phase 3 The content is 0.17%.

Embodiment 3

[0032] Take a WO 3 Grind tungsten slag with a content of 1.2% to less than 74 μm, and another waste quartz glass to grind it to less than 74 μm, and grind the material according to tungsten slag:waste glass:sodium carbonate:sodium sulfate=1:0.1:0.1: Mix it thoroughly at a ratio of 0.1, roast at 950°C for 100 minutes, grind the roasted material to less than 74 μm, and then put it into water for leaching. According to the liquid-solid ratio of 3:1, the leaching temperature is 90°C, the leaching stirring time is 40 minutes, and the leaching rate is obtained by filtration. 99.1% of the leachate, WO in the slag phase 3 The content is 0.04%.

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Abstract

The invention discloses a method for extracting tungsten from a tungsten-containing raw material through waste glass. The method includes the steps that the tungsten-containing material and the wasteglass are ground and smashed and then mixed with sodium salt, the mixture is roasted, and a sintered material is obtained; and after being ore-ground, the sintered material is leached with water, andtungsten-containing extract is obtained. According to the method, quartz used in the traditional tungsten ore thermometallurgy process is replaced with the waste glass, the tungsten leaching rate canbe increased, the operation is easy, the requirements on the raw material are low, the operating cost is low, the problem of low efficiency of fixing of calcium and magnesium by the quartz in the traditional sodium salt roasting process is solved, and the method is also an effective means for consuming the waste glass on a large scale.

Description

technical field [0001] The invention relates to a method for treating tungsten-containing materials, in particular to a method for efficiently extracting tungsten from tungsten-containing raw materials by using waste glass, and belongs to the technical field of tungsten smelting. Background technique [0002] The traditional fire extraction process of tungsten is "sodium roasting-water leaching", that is, black tungsten concentrate ((Mn,Fe)WO 4 ) / Scheelite Concentrate (CaWO 4 ) and other tungsten-containing materials are transferred to sodium tungstate (Na 2 WO 4 ), and then the sintered material is dissolved in the aqueous solution by water immersion, so as to realize the separation from other insoluble components, and the required sodium salt is sodium carbonate (Na 2 CO 3 ) / sodium sulfate (Na 2 SO 4 ) / sodium nitrate (NaNO 3 ) / sodium hydroxide (NaOH), etc. Compared with wet smelting, pyro smelting has a wide range of applications and is easy to apply on a large scal...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B3/04C22B34/36
CPCC22B1/02C22B3/04C22B34/36
Inventor 孙伟胡岳华刘航韩海生陈攀王丽
Owner CENT SOUTH UNIV
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