Novel method for producing industrial phosphoric acid by purification with wet process phosphoric acid

A wet-process phosphoric acid, industrial-grade technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problem of high cost and achieve the effect of low cost, high quality and high purity

Active Publication Date: 2013-09-18
SHANDONG LUBEI ENTERPRISE GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

EDTA complexation-adsorption method has good purification effect, but the cost is high

Method used

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  • Novel method for producing industrial phosphoric acid by purification with wet process phosphoric acid
  • Novel method for producing industrial phosphoric acid by purification with wet process phosphoric acid
  • Novel method for producing industrial phosphoric acid by purification with wet process phosphoric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]Mix 20.6% wet-process phosphoric acid and 6.93% hydrochloric acid acid solution at a volume ratio of 1:1, take 100ml of hydrochloric acid acid solution and slowly pour it into a mixed acid tank containing 100ml of wet-process phosphoric acid. , fully stirred and mixed, the stirring speed was 200rpm, and the reaction time was 60min; 1.5% volume of 0.1wt% flocculant was added to the mixed acid to coagulate and precipitate; filter with a filter press to obtain clear filtrate 190ml, ω(P 2 o 5 ) 13.84%; the filter residue was washed and dried to obtain 8.27g of alabaster.

Embodiment 2

[0036] Mix 20.6% wet-process phosphoric acid and 6.93% hydrochloric acid acid solution at a volume ratio of 3:1, slowly pour 50ml of hydrochloric acid acid solution into a mixed acid tank containing 150ml of wet-process phosphoric acid, and store it at 50-55°C , fully stirred and mixed, the stirring speed was 200rpm, and the reaction time was 60min; pressure filtration got clear filtrate 186ml, ω(P 2 o 5 ) 17.90%; the filter residue was washed and dried to obtain 10.16g of alabaster.

Embodiment 3

[0038] 20.6% wet-process phosphoric acid and 6.93% hydrochloric acid acid solution are mixed according to the volume ratio of 6:1, 180ml of wet-process phosphoric acid is placed in a 500ml beaker, and under the condition of full stirring at 50-55°C, slowly add 30ml of hydrochloric acid for acidification The liquid is slow, and the reaction time is 60 minutes. Press filtration, get clear filtrate 190ml, ω (P 2 o 5 ) 19.10%; the filter residue was washed and dried to obtain 11.3g of alabaster.

[0039] Embodiment effect situation is shown in Table 2:

[0040] Analysis results of crude phosphoric acid after mixing:

[0041]

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Abstract

The invention relates to a novel method for producing industrial phosphoric acid by purification with a wet process phosphoric acid and belongs to the fields of a refining technology of wet process phosphoric acid and processing of industrial phosphoric acid. The core of the method provided by the invention is as follows: the content of P2O5 of wet process phosphoric acid produced by a sulfuric acid method is higher, and a lot of SO4<2-> ions are comprised in the phosphoric acid. The content of P2O5 of an acidolysis liquid produced by decomposing phosphate ore by hydrochloric acid is lower, and calcium ions in high content are comprised. The wet process phosphoric acid and the acidolysis liquid are mixed, so that the content of P2O5 in the mixed liquid is improved, and the contents of calcium ions and sulfate radicals in the mixed liquid are reduced. The novel method has a certain promoting effect on separation out of other impurities. According to the novel method, mixed desulfuration is used to replace conventional desulfurization technology by phosphoric ore pulp and barium carbonate, so that the desulfurization rate in one step can reach over 99%. Two different phosphoric acids are mixed, so that SO4<2-> and Ca<2+> generate CaSO4 precipitates to remove SO4<2->. The optimal decontamination index w of the mixed acidic liquid obtained is w(H3PO4)=(10-25)%, while w (SO4<2->) is not monitored. The main component of the filter residue is CaSO4, and the purity is high and reaches 99%.

Description

technical field [0001] The invention relates to a new method for producing industrial-grade phosphoric acid by wet-process phosphoric acid purification, which belongs to the field of wet-process phosphoric acid refining technology and industrial-grade phosphoric acid processing. Background technique [0002] Phosphoric acid is an important intermediate product in industrial and agricultural production and the basic raw material for phosphorus products. At present, there are mainly two kinds of phosphoric acid production processes at home and abroad: thermal method and wet method. Thermal method phosphoric acid uses yellow phosphorus as raw material to burn and oxidize to produce phosphorus pentoxide, which is cooled and hydrated to produce phosphoric acid. This method has good product quality. , high cost, high energy consumption, etc., are mostly used to manufacture phosphate products or food-grade phosphate; wet-process phosphoric acid is to prepare phosphoric acid by deco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/234
Inventor 吕天宝武文焕冯怡利高强鲍树涛王同永
Owner SHANDONG LUBEI ENTERPRISE GROUP
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