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Process for purification of wet-process phosphoric acid

A wet-process phosphoric acid and purification process technology, applied in the direction of phosphorus compounds, inorganic chemistry, chemical instruments and methods, etc., can solve the problems of low phosphoric acid efficiency, high cost, complicated process, etc., and achieve maximum benefit, less entrained phosphoric acid, good selectivity

Active Publication Date: 2016-11-23
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are: ① The original phosphoric acid needs to be concentrated to 40-50% before extraction, and the efficiency of back-extraction with water after extraction is very low. The concentration after back-extraction is between 20-30%, and it needs to be concentrated to 70-80% Then carry out subsequent treatment, that is to say, two times of concentration are required before and after, the process is complicated, the energy consumption is large and the cost is high
② The extraction efficiency of phosphoric acid by the above method is not high, and the general extraction rate is between 60-80%.
However, they are all limited to theoretical research, and no industrially feasible stripping process and scheme have been proposed.

Method used

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  • Process for purification of wet-process phosphoric acid
  • Process for purification of wet-process phosphoric acid
  • Process for purification of wet-process phosphoric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Low-grade phosphoric acid is used as raw material phosphoric acid, in which the content of iron, aluminum and magnesium ions is relatively high, and the indicators are shown in Attached Table 1.

[0067] The wet phosphoric acid purification process includes the following steps:

[0068] (1) Extraction and separation of crude phosphoric acid: crude phosphoric acid and extract are mixed and extracted, the number of extractions is 3 times, the extraction ratio (volume ratio of extract: crude phosphoric acid) is 3:1, the extraction temperature is 60°C, the extraction time is 30 minutes, and the extraction time is 30 minutes. Phase 10min to get organic phase 1 (containing extractant) and water phase 1 (water phase 1 is purified phosphoric acid); the content of each substance in purified phosphoric acid is shown in attached table 1; the extract is P204 diluted with sulfonated kerosene, and the dilution ratio : 1 (i.e. the volume ratio of sulfonated kerosene and P204);

[006...

Embodiment 2

[0081] Experimental operating conditions and raw materials are the same as in Example 1. But back extraction regeneration uses the sulfuric acid that concentration is 20wt%, its each parameter sees attached table 3 and 4.

[0082] table 3

[0083]

[0084] Table 4

[0085]

Embodiment 3

[0087] Experimental operating conditions and raw materials are the same as in Example 1. However, the extract is DNNSA diluted with sulfonated kerosene, and the dilution ratio is 2:1 (that is, the volume ratio of sulfonated kerosene to P204), and its parameters are shown in attached tables 5 and 6.

[0088] table 5

[0089]

[0090] Table 6

[0091]

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Abstract

The present invention relates to a process for the purification of wet-process phosphoric acid, and in particular to back-extraction regeneration of extract from a wet-process phosphoric acid purification process. The present invention provides a wet-process phosphoric acid purification process which comprises the steps of crude phosphoric acid extraction separation, washing separation, stripping separation, concentration monitoring and crystallization separation. The extract prepared by acidic extractant is used to extract the metal cations directly from the wet-process phosphoric acid, and the acid extractant has good extraction metal ion selectivity, less entrainment phosphoric acid and high extraction rate of phosphoric acid in the extraction process. In addition, the regenerated extract obtained after the stripping separation can be repeatedly recycled (the recycling effect is still good after recycling 50 times), and the crystal can be directly used for producing the flame retardant, and the production process can be realized with benefits maximized.

Description

technical field [0001] The invention relates to a purification process of wet-process phosphoric acid, in particular to the back-extraction regeneration of the extract in the wet-process phosphoric acid purification process. Background technique [0002] Wet-process phosphoric acid is an important method of phosphoric acid production. Compared with thermal phosphoric acid, its production cost is low and energy consumption is low, which meets the domestic and international energy-saving and emission-reduction requirements. However, the domestic low-grade phosphate rock determines that the quality of wet-process phosphoric acid in my country is generally low. Wet-process phosphoric acid purification technology has become a crucial technology for the utilization of wet-process phosphoric acid in my country. [0003] Wet phosphoric acid purification methods mainly include chemical precipitation, crystallization, ion exchange and solvent extraction. The solvent extraction metho...

Claims

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Application Information

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IPC IPC(8): C01B25/238
CPCC01B25/238
Inventor 杨林唐聪张志业王辛龙
Owner SICHUAN UNIV
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