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Process for mfg. industrial phosphoric acid by low-grade phosphorus deposit in hydrogen chloride decomposition

A manufacturing industry, low-grade technology, applied in phosphoric acid, chemical instruments and methods, phosphorus compounds, etc., can solve the problems of impurity content failing to meet industrial-grade standards, calcium chloride has little use, and concentration is thin

Inactive Publication Date: 2006-01-25
湖北中磷科技有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

Although the closed cycle of the mother liquor has been formed in this way, the use of calcium chloride is not large. The stacking and resurgence of a large amount of chloride will also become calcium chloride waste liquid. The quality of the extracted phosphoric acid prepared is better than that of sulfuric acid wet-process phosphoric acid, but the concentration Too dilute, impurity content failed to meet industrial-grade standards

Method used

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  • Process for mfg. industrial phosphoric acid by low-grade phosphorus deposit in hydrogen chloride decomposition
  • Process for mfg. industrial phosphoric acid by low-grade phosphorus deposit in hydrogen chloride decomposition

Examples

Experimental program
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Embodiment 1

[0025] according to figure 1 The process flow of hydrochloric acid decomposition of low-grade phosphate rock to produce industrial phosphoric acid

[0026] name

[0027] 1000 grams of phosphate rock powder, passed through 40 meshes, decomposed by hydrochloric acid (the final mother liquor established by circulation operation), discharged 150 grams of dry silicon slag, and analyzed at 10±2°C for P- o1 1182 g (its P 2 o 5=19.5%), 3 ± 2 ℃ cold analysis chloride 1890 grams, P- 01 Add 591 grams of 30% concentrated hydrochloric acid with hydrochloric acid in a weight ratio of 2:1, heat and stir the beating agent to completely dissolve, extract the beating liquid three times at 15-30°C with TBP: kerosene=1:1 extractant, the following extractant Wash the organic phase twice with the extraction washing water + raffinate water phase, each time the water volume is 3% of the volume of the extracted organic phase, the washing temperature is 15 ° C, and the washing time is 4 m...

Embodiment 2

[0031] according to figure 1 The process flow of hydrochloric acid decomposition of low-grade phosphate rock to produce industrial phosphoric acid

[0032] name

[0033] 1000 grams of phosphate rock powder, passed through 40 meshes, decomposed by hydrochloric acid (the final mother liquor established by circulation operation), discharged 341 grams of dry silicon slag, and analyzed at 20±2°C for P- o1 745 grams (including P 2 o 5 =19.2%), -15 ± 2 ℃ cold analysis chloride 1290 grams, P- 01 Add 373 grams of 30% concentrated hydrochloric acid in a weight ratio of 2:1 with hydrochloric acid, heat and stir the beating agent to completely dissolve, use TBP+kerosene=1:1 extractant 2980ml, extract the beating liquid three times under normal temperature, and extract and wash with the following extractant: Wash the organic phase twice with water + raffinate water phase, the amount of water is 4% of the volume of the extracted organic phase, the washing temperature is 40°C, ...

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Abstract

A process for preparing industrial phosphoric acid by use of hydrochloric acid to decompose the low-and medium-grade phosphorus ore includes such steps as using hydrochloric acid to decompose phosphorus ore to obtain calcium chlorophosphate, using hydrochloric acid to prepare slurry, dissolving the calcium chlorophosphate in it, extracting by tri-butyl phosphate, concentrating, extracting by tri-butyl phosphate and isopropyl ether, concentrating, and de-coloring to obtain 85% industrial phosphoric acid. Its advantage is no environmental pollution.

Description

technical field [0001] The invention belongs to the purification technology of wet-process phosphoric acid, and is in the scope of the technology of extracting and purifying wet-process phosphoric acid obtained by decomposing phosphate rock with hydrochloric acid with an organic solvent. Background technique: [0002] The production of industrial and food phosphoric acid from wet-process phosphoric acid through organic solvent extraction and purification has always been the goal pursued by people. There has been a lot of progress in this aspect at home and abroad, but they have not been able to be widely used in large-scale production. Most of the work in this area is based on sulfuric acid wet-process phosphoric acid as raw material, and very few use hydrochloric acid wet-process phosphoric acid as raw material. Abroad, only the Israeli I.M.I. company used hydrochloric acid to decompose phosphate rock in the 1960s, using C 4 or C 5 Alcohol, purified phosphoric acid obtai...

Claims

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Application Information

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IPC IPC(8): C01B25/22C01B25/234
Inventor 姚鼎文孙勇姚宁
Owner 湖北中磷科技有限公司
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