Method for deeply removing phosphorus in coarse sodium tungstate solution

A sodium tungstate solution technology, applied in chemical instruments and methods, tungsten compounds, inorganic chemistry, etc., can solve the problems of large amount of sedimentation slag, large tungsten loss, loss, etc., achieve high phosphorus removal efficiency, short reaction time, Good phosphorus removal effect

Inactive Publication Date: 2015-01-28
JIANGXI RARE EARTH & RARE METALS TUNGSTEN GRP
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Problems solved by technology

However, this method forms a large amount of precipitated slag, which causes a lot of tungsten loss and is difficult to recycle; in addition, chloride ions are brought into the sodium tungsta

Method used

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  • Method for deeply removing phosphorus in coarse sodium tungstate solution

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Embodiment 1

[0021] Embodiment 1: a kind of method of thick sodium tungstate solution deep phosphorus removal, comprising:

[0022] (1) In the process of producing ammonium paratungstate by ion exchange method, the mass ratio of phosphorus to tungsten is greater than 0.0007[P / WO 3 ≥0.0007%] crude sodium tungstate solution must be equipped with special phosphorus removal operations;

[0023] (2) Phosphorus removal reaction conditions: temperature 90±5°C, the amount of phosphorus removal agent added is 2.5 times the mass of phosphorus in the crude tungstic acid solution, and the stirring time is 30 minutes; light calcium carbonate is selected as the phosphorus removal agent, which has a short reaction time , Fast speed and high phosphorus removal efficiency;

[0024] (3) The feed liquid after the reaction is filtered through a plate and frame filter press to realize liquid-solid separation, and a new solution and a precipitated residue with a phosphorus content less than 0.06g / l are obtaine...

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Abstract

The invention relates to a method for deeply removing phosphorus in a coarse sodium tungstate solution. The method is characterized in that in ammonium paratungstate production adopting an ion exchange method, a sample is taken from a coarse sodium tungstate solution obtained by reduced pressure decoction leaching, a detection result shows that a phosphorus-tungsten mass ratio of the sample is greater than or equal to 0.0007%, the material liquid is heated to a temperature of 90+/-5 DEG C, light calcium carbonate is used as a phosphorus removal agent so that a reaction rate is fast and phosphorus removal efficiency is high, the phosphorus removal agent is added into the material liquid, wherein the use amount of the phosphorus removal agent is 2-15 times mass of phosphorus in the material liquid, the mixed solution undergoes a reaction for 30min under the conditions of thermal insulation and stirring so that phosphate groups in the phosphorus removal agent and the material liquid form difficultly soluble calcium hydrogen phosphate precipitates under the alkaline conditions, the reaction product liquid is filtered by a plate-and-frame filter press so that solid-liquid separation is realized and a novel solution with phosphorus content less than 0.06g/l and precipitates are obtained, and the novel solution subjected to phosphorus removal is used for production of ammonium paratungstate. Through the method, a phosphate mass concentration of the sodium tungstate solution is less than 0.5mg/l and a phosphorus removal rate is more than 99%.

Description

technical field [0001] The invention relates to a method for deep phosphorus removal of crude sodium tungstate solution, which provides a deep phosphorus removal process for crude sodium tungstate solution. Background technique [0002] In the process of producing ammonium paratungstate by ion exchange method, the crude sodium tungstate solution obtained from the decomposition of tungsten concentrate by alkali method contains high phosphorus salts. If the phosphorus salts in the solution are not specially removed, and enter the next process of resin adsorption, it is easy to cause The phosphorous content of ammonium paratungstate in the product exceeds the standard of 7ppm, so that the purity of the product ammonium paratungstate does not meet the requirements and becomes a waste product. A common method for phosphorus removal is to add magnesium chloride solution to crude sodium tungstate solution to form magnesium phosphate precipitation, and remove phosphorus by filtering...

Claims

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Application Information

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IPC IPC(8): C01G41/00
CPCC01G41/00
Inventor 罗章青唐美春
Owner JIANGXI RARE EARTH & RARE METALS TUNGSTEN GRP
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