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Method for extract phase phosphoric acid back extraction in the course of extracting wet-process phosphoric acid by an organic solvent method

An organic solvent and wet-process phosphoric acid technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as high energy consumption, complicated process, and low product yield

Inactive Publication Date: 2009-09-09
WUHAN INSTITUTE OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The problem to be solved by the present invention is to provide a simple and effective, pollution-free, energy-saving, and improved stripping production method for the above-mentioned prior art, and to overcome the complex process, low product yield, and energy consumption of the prior art. Large and insufficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The phosphate rock is subjected to sulfuric acid decomposition treatment, and the crude phosphoric acid obtained is pretreated. During the pretreatment, the quality of calcium carbonate is 90%-150% of the sulfate ion in the crude phosphoric acid, and the quality of sodium carbonate is 90%-150% of the fluorine in the crude phosphoric acid. 80%-120% of ions and 0.1%-1% of the mass of silicon dioxide are added according to the crude phosphoric acid, heated in a water bath at a temperature of 60°C, the rotation speed is 300r / min, the reaction time is 4h, static, and filtered.

[0018] The obtained filtrate gets 100ml and packs in a three-necked flask, adds 300ml of extractant (kerosene: tributyl phosphate=3: 1, volume ratio), covers the bottle stopper, and the three-necked flask is placed in a constant temperature water bath, the temperature The temperature is 60°C, the rotation speed is 100r / min, the extraction time is 15min, stand still, and separate layers.

[0019] The ...

Embodiment 2

[0022] The pretreatment, extraction and washing steps are the same as in Example 1, except that TritonX-114 is used as the extractant, 200 g of the organic solvent extraction phase is taken, 50 g of deionized water is added, and 4.8 g of TritonX-114 (concentration is 1.9%) is added, and then According to the above steps, heat at 50°C and 180r / min for 30 minutes, stand still, and separate layers. The content of phosphoric acid in the organic solvent extraction phase is 0.93%, the content of phosphoric acid in the back-extraction water phase after cloud point extraction is 3.31%, and the back-extraction rate of phosphoric acid is 81.41%.

Embodiment 3

[0024] The pretreatment, extraction and washing steps are the same as in Example 1, except that Tween-20 is used as the extractant, 200 g of the organic solvent extraction phase is taken, 50 g of deionized water is added, and 2.6 g of Tween-20 (concentration is 1.0%) is added, and then According to the above steps, heat at 50°C with a rotation speed of 100r / min for 20 minutes, stand still, and separate layers. The content of phosphoric acid in the organic solvent extraction phase is 0.93%, the content of phosphoric acid in the back-extraction water phase after cloud point extraction is 3.54%, and the back-extraction rate of phosphoric acid is 91.56%.

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Abstract

The invention relates to a method for extract phase phosphoric acid back extraction in the course of extracting wet-process phosphoric acid by an organic solvent method, which comprises steps: in the process of purification, sedimentation, extraction, washing, back extraction and concentration of the wet-process phosphoric acid, surface active agent is taken as stripping agent, the surface active agent is added into the extract phase of organic solvent extracted phosphoric acid to obtain mixing solution and is inversely extracted under stirring, is heated in the temperature range of 30 DEG C to 100 DEG C in water bath and constant temperature with the rotation speed of 100-200r / min and reaction time of 20-40min, stands and delaminated. The back extraction rate of the phosphoric acid obtained by the method is much higher than the back extraction rate of the phosphoric acid without adding non-ionic surface active agent; without adding non-ionic surface active agent, the back extraction rate of the phosphoric acid which is inversely extracted with deionized water is only 50-70%, and generally, 3-5 times of back extraction is carried out. The method reduces concentrated steam consumption, saves energy by more than 30% compared with the traditional technique taking water as stripping agent, simultaneously simplifies technique process and reduces the operation time of back extraction.

Description

technical field [0001] The invention relates to a method for back-extracting phosphoric acid in the extraction phase in the process of extracting phosphoric acid in wet process by organic solvent method. Background technique [0002] As an important intermediate product in phosphorus chemical industry, phosphoric acid is not only used in the production of ammonium phosphate, double superphosphate, compound fertilizers, various phosphates, etc., but also used in petroleum, metallurgy, chemical industry, electronics, medicine, food, etc. It is an indispensable raw material for these industries. The end use of phosphoric acid depends on its purity, which in turn generally depends on its production method. At present, there are two main production methods of phosphoric acid: thermal method and wet method. Thermal phosphoric acid uses electric furnace method to produce yellow phosphorus, and then oxidizes and absorbs to obtain relatively pure industrial phosphoric acid; wet pho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/46
Inventor 丁一刚吴元欣何俊潘志权查炎华杨昌炎赵非洲田志高陈虎
Owner WUHAN INSTITUTE OF TECHNOLOGY
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