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Method for preparing high-concentration phosphoric acid by raffinate phosphoric acid

A high-concentration technology of raffinate phosphoric acid, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of high production costs, differences, and high energy consumption, and achieve less stringent process conditions, reduce production costs, easily controlled effects

Inactive Publication Date: 2012-07-04
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thermal process phosphoric acid is produced by using yellow phosphorus as raw material. The product has high purity and low impurity content, but the production cost is high and energy consumption is high. Wet process phosphoric acid is produced by acid decomposition of phosphate rock. The advantage of low cost, but according to different uses of the product, the requirements for acid impurities in the final product are different. Generally, it needs to go through processes such as impurity removal and purification before it can be applied in industry, and the process flow is relatively long
The progress and improvement of wet-process phosphoric acid production methods mainly purify phosphoric acid through extraction, and industrial-grade and food-grade phosphoric acid can already be obtained, so that wet-process phosphoric acid can also be used to prepare high value-added phosphorus chemical products, but the obtained by-product raffinate phosphoric acid High impurity content, which currently affects its further utilization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Get 2.0L demagnesizing agent and 800g mass percentage concentration is 55.0% (by H 3 PO 4 %) of the raffinate phosphoric acid at 30°C and a stirring speed of 250rpm for 60 minutes after magnesium removal, add 4.0 g of diatomite to the phosphoric acid after magnesium removal, and raise the temperature at a rate of 5°C / min to 120°C, vacuum 0.065MPa, distilled under reduced pressure for 2h, then concentrated the defluorinated phosphoric acid solution at 150°C, vacuum 0.075MPa for 3h, the product was lowered to normal temperature and tested for H 3 PO 4 The content of fluorine is 89.5%, the content of fluorine is 0.24%, and the content of magnesium is 0.89%.

Embodiment 2

[0013] Get 1.7L demagnesizing agent and 800g mass percentage concentration is 60.0% (by H 3 PO 4 %) of the raffinate phosphoric acid at 35°C and a stirring speed of 200rpm for 45 minutes after magnesium removal, 8.0 g of diatomite was added to the phosphoric acid after magnesium removal, and the temperature was raised at a rate of 8°C / min to 140°C, vacuum 0.0MPa, distilled for 3h, then concentrated the defluorinated phosphoric acid solution at 240°C, vacuum 0.0MPa for 3.5h, the product was lowered to normal temperature and tested for H in the product 3 PO 4 The content is 93.12%, the fluorine content is 0.3%, and the magnesium content is 0.93%.

Embodiment 3

[0015] Get 1.8L demagnesizing agent and 800g mass percentage concentration is 55.0% (by H 3 PO 4 %) of the raffinate phosphoric acid at 40°C and a stirring speed of 200rpm for 45 minutes, then add 6.5g of diatomaceous earth to the phosphoric acid after the removal of magnesium, and heat up at a rate of 4°C / min in the vacuum distillation device to 80°C, with a vacuum of 0.09MPa, distilled under reduced pressure for 1h, and then concentrated the defluorinated phosphoric acid solution at a temperature of 120°C, with a vacuum of 0.09MPa for 5h, and the obtained product was lowered to normal temperature and then tested. h 3 PO 4 The content of fluorine is 91.3%, the content of fluorine is 0.26%, and the content of magnesium is 0.92%.

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PUM

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Abstract

The invention discloses a method for preparing high-concentration phosphoric acid by raffinate phosphoric acid, comprising the following steps of: taking raffinate phosphoric acid as raw acid, settling and filtering, collecting filtrate, carrying out de-magging and defluorination pretreatment, carrying out reduced pressure concentration, and obtaining phosphoric acid product. The method disclosed by the invention has simple process, unharsh technological conditions and easy control. H3PO4 content of the raw acid is lower and the raw acid contains more impurities, but cost is relatively low; high-concentration phosphoric acid is prepared while product cost is reduced, the product can be taken as fertilizer additive or raw material used for producing high-concentration fertilizer and also can replace orthophosphoric acid and polyphosphoric acid, thus be widely used, and a product with higher additional value can be produced.

Description

technical field [0001] The invention relates to a method for preparing high-concentration phosphoric acid, in particular to using the by-product raffinate phosphoric acid obtained by wet-process phosphoric acid purification process to prepare industrial-grade and food-grade phosphoric acid as raw material acid, which is concentrated under certain conditions after pretreatment to prepare high-density phosphoric acid. method of concentration of phosphoric acid. technical background [0002] Phosphoric acid is a very important intermediate product in the phosphorus chemical industry, widely used in fertilizer, food, medicine and other industries. [0003] At present, according to the industrial production methods, phosphoric acid is named as hot-process phosphoric acid and wet-process phosphoric acid. Thermal phosphoric acid is produced by using yellow phosphorus as raw material. The product has high purity and low impurity content, but the production cost is high and energy c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/234
Inventor 何浩明刘飞郭举李文飞
Owner WENGFU (GRP) CO LTD
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