A method for extracting tungsten from tungsten alkali boiling slag

Abstract

The present invention provides a method for extracting tungsten from tungsten alkali-boiling slag, comprising the following steps: after pelletizing the tungsten alkali-boiling slag, spraying with leaching solution to obtain a spraying liquid containing WO3; the solute of the leaching solution includes a mixture of sodium hydroxide and sodium salt, or a mixture of sodium carbonate and sodium salt; the sodium salt includes one or two of sodium sulfate and sodium phosphate; after WO3 in the spraying liquid is adsorbed by a resin adsorption column, it is desorbed by a sodium hydroxide solution to obtain a sodium tungstate solution. The method of the present invention has a short process, is easy to operate, and is environmentally friendly; compared with conventional methods, its alkali consumption is much less than that of alkali roasting process, and the amount of auxiliary materials used is small; compared with the high temperature of conventional methods, the temperature is room temperature, no heating is required, and the energy consumption is low.

Description

Technical Field

[0001] The invention relates to the technical field of extracting tungsten from tungsten alkali-boiling slag, and in particular to a method for extracting tungsten from tungsten alkali-boiling slag. Background Art

[0002] The WO3 content in tungsten slag is about 1%, which has certain economic value. my country's tungsten alkali slag has an annual output of 100,000 tons. The process technologies currently used in the market mainly include acid dissolution and alkali roasting. The acid dissolution process produces a large amount of wastewater, the iron content of the solution after acid dissolution is high, and the cost of subsequent separation and treatment is high; although the alkali roasting method solves the problem of high iron content, it consumes a large amount of alkali and high energy consumption. Summary of the invention

[0003] In view of this, the object of the present invention is to provide a method for extracting tungsten from tungsten alkali-boiled slag. The method provided by the present invention has low alkali consumption and does not require high temperature.

[0004] In order to achieve the above-mentioned object of the invention, the present invention provides a method for extracting tungsten from tungsten alkali-boiling slag, comprising the following steps:

[0005] After the tungsten alkali slag is pelletized, it is sprayed with leaching liquid to obtain a spraying liquid containing WO3;

[0006] The solute of the leachate includes a mixture of sodium hydroxide and a sodium salt, or a mixture of sodium carbonate and a sodium salt; the sodium salt includes sodium sulfate and / or sodium phosphate;

[0007] After WO3 in the spraying liquid is adsorbed by a resin adsorption column, it is desorbed by a sodium hydroxide solution to obtain a sodium tungstate solution.

[0008] Preferably, the concentration of sodium hydroxide or sodium carbonate in the leachate is 1 to 3 mol / L.

[0009] Preferably, the concentration of sodium salt in the leachate is 0.5-1 mol / L.

[0010] Preferably, the resin adsorption column is a macroporous weakly basic anion resin adsorption column.

[0011] Preferably, during the desorption, the flow rate of the sodium hydroxide solution passing through the resin adsorption column is 1 to 3 BV.

[0012] Preferably, during the adsorption, the mass concentration of WO3 in the spraying liquid is greater than 1%.

[0013] The present invention provides a method for extracting tungsten from tungsten alkali-boiling slag, comprising the following steps: after pelletizing the tungsten alkali-boiling slag, spraying with leaching solution to obtain a spraying liquid containing WO3; the solute of the leaching solution comprises a mixture of sodium hydroxide and sodium salt, or a mixture of sodium carbonate and sodium salt; the sodium salt comprises one or two of sodium sulfate and sodium phosphate; after WO3 in the spraying liquid is adsorbed by a resin adsorption column, it is desorbed by a sodium hydroxide solution to obtain a sodium tungstate solution. The method of the present invention has a short process, is easy to operate, and is environmentally friendly; compared with conventional methods, its alkali consumption is much less than that of alkali roasting process, and the amount of auxiliary materials (alkali) used is small; compared with the high temperature of conventional methods, the temperature is room temperature, no heating is required, and the energy consumption is low. DETAILED DESCRIPTION

[0014] The present invention provides a method for extracting tungsten from tungsten alkali-boiling slag, comprising the following steps:

[0015] After the tungsten alkali slag is pelletized, it is sprayed with leaching liquid to obtain a spraying liquid containing WO3;

[0016] The solute of the leachate includes a mixture of sodium hydroxide and sodium salt, or a mixture of sodium carbonate and sodium salt; the sodium salt includes one or both of sodium sulfate and sodium phosphate;

[0017] After WO3 in the spraying liquid is adsorbed by a resin adsorption column, it is desorbed by a sodium hydroxide solution to obtain a sodium tungstate solution.

[0018] The present invention uses leaching liquid to spray after tungsten alkali-boiling slag is pelletized to obtain a spraying liquid containing WO3.

[0019] In the present invention, the size of the tungsten alkali-boiling slag after balling is 1 to 10 mm, more preferably 3 to 5 mm.

[0020] In the present invention, the solute of the leaching solution includes a mixture of sodium hydroxide and a sodium salt, or a mixture of sodium carbonate and a sodium salt.

[0021] In the present invention, the sodium salt includes sodium sulfate and / or sodium phosphate.

[0022] In the present invention, the concentration of sodium hydroxide or sodium carbonate in the leachate is preferably 1-3 mol / L, more preferably 2 mol / L; the concentration of sodium salt in the leachate is preferably 0.5-1 mol / L, more preferably 0.7-0.8 mol / L. In the present invention, the solvent of the leachate is preferably water.

[0023] After obtaining the spraying liquid containing WO3, the present invention uses a resin adsorption column to adsorb WO3 in the spraying liquid, and then desorbs it with a sodium hydroxide solution to obtain a sodium tungstate solution.

[0024] In the present invention, the resin adsorption column is preferably a macroporous weakly basic anion resin adsorption column. In the present invention, the macroporous weakly basic anion resin adsorption column is D314 or D318.

[0025] In the present invention, during the adsorption, the mass concentration of WO3 in the spraying liquid is preferably greater than 1%. In the present invention, when the mass concentration of WO3 in the spraying liquid is ≤ 1%, it is preferably reused and continued to spray.

[0026] In the present invention, the concentration of the sodium hydroxide solution is preferably 1-3 mol / L, more preferably 2 mol / L. In the present invention, during the desorption, the flow rate of the sodium hydroxide solution through the resin adsorption column is preferably 1-3 BV, more preferably 2 BV.

[0027] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Example 1

[0029] Take 100kg of tungsten alkali boiling slag, make the tungsten slag into balls with a particle size of 5mm. After balling, the spherical tungsten slag is dried and placed in a leaching column for spraying with a leaching solution. The leaching solution is an aqueous solution of 0.5mol / L sodium sulfate and 1mol / L sodium hydroxide. After continuous spraying for 15 days, the liquid is collected and the tungsten concentration is 1.02g / L. The solution is adsorbed using a low tungsten adsorption process, and finally a tungsten-containing solution with a concentration of 156g / L is obtained.

[0030] Example 2

[0031] Take 200kg of tungsten alkali boiling slag, make the tungsten slag into balls with a particle size of 3mm. After balling, dry the spherical tungsten slag, put it into a leaching column and spray it with leaching liquid. The leaching liquid is an aqueous solution of 1mol / L sodium phosphate and 2mol / L sodium hydroxide. After continuous spraying for 25 days, collect the liquid and get a tungsten concentration of 1.32g / L. Adsorb the solution using a low tungsten adsorption process, and finally get a tungsten-containing solution with a concentration of 152g / L.

[0032] Example 3

[0033] Take 150kg of tungsten alkali boiling slag, make the tungsten slag into balls with a particle size of 6mm. After balling, dry the spherical tungsten slag, put it into a leaching column and spray it with leaching liquid. The leaching liquid is an aqueous solution of 0.5mol / L sodium sulfate and 3mol / L sodium carbonate. After continuous spraying for 15 days, collect the liquid and get a tungsten concentration of 1.42g / L. Adsorb the solution using a low tungsten adsorption process, and finally get a tungsten-containing solution with a concentration of 153g / L.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for extracting tungsten from tungsten alkali-boiling slag at room temperature, characterized in that: The steps are: After the tungsten alkali slag is pelletized, it is sprayed with leaching liquid to obtain a spraying liquid containing WO3; The solute of the leachate includes a mixture of sodium hydroxide and a sodium salt, or a mixture of sodium carbonate and a sodium salt; the sodium salt is sodium sulfate; After the WO3 in the spraying liquid is adsorbed by a resin adsorption column, it is desorbed by a sodium hydroxide solution to obtain a sodium tungstate solution; The concentration of sodium hydroxide or sodium carbonate in the leachate is 1-3 mol / L; The concentration of sodium salt in the leachate is 0.5-1 mol / L; The resin adsorption column is a macroporous weakly basic anion resin adsorption column; During the desorption, the flow rate of the sodium hydroxide solution passing through the resin adsorption column is 1-3 BV.

2. The method according to claim 1, characterized in that During the adsorption, the mass concentration of WO3 in the spraying liquid is greater than 1%.