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Method for preparing technical grade phosphoric acid, foodstuff grade phosphoric acid and phosphate using wet method and thin phosphoric acid

A technology of dilute phosphoric acid and phosphoric acid, applied in phosphates, chemical instruments and methods, phosphorus oxyacids, etc., can solve the problems of high concentration energy consumption and increase the difficulty of concentration, achieve good purification effect, reduce density and viscosity , the effect of reducing steam consumption

Inactive Publication Date: 2007-05-02
SICHUAN JINGCUI CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Production practice shows that the concentration of wet-process dilute phosphoric acid consumes a lot of energy, and it will contain P 2 o 5 About 30% of wet dilute phosphoric acid is concentrated into P 2 o 5 About 50% wet-process phosphoric acid will consume 1.1-1.2 tons of steam to evaporate 1 ton of water. If the raw ore is collophosphine, it will increase the difficulty of concentration

Method used

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  • Method for preparing technical grade phosphoric acid, foodstuff grade phosphoric acid and phosphate using wet method and thin phosphoric acid
  • Method for preparing technical grade phosphoric acid, foodstuff grade phosphoric acid and phosphate using wet method and thin phosphoric acid
  • Method for preparing technical grade phosphoric acid, foodstuff grade phosphoric acid and phosphate using wet method and thin phosphoric acid

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Embodiment 1

[0033] Embodiment 1: Preparation of technical grade phosphoric acid

[0034] In the present embodiment, the composition of raw material wet process dilute phosphoric acid used is as follows:

[0035] P 2 o 5 SO 4 2- F Fe As heavy metal (calculated as Pb) chromaticity

[0036] 28.80% 2.19% 1.68% 0.71% 0.0014% 0.0025% >300

[0037] Continuous production, the process steps are shown in Figure 1, including pretreatment, secondary desulfurization and defluorination, filtration separation, extraction, deep desulfurization, washing, stripping and concentration.

[0038] (1) Pretreatment

[0039] Pretreatment is carried out in the pretreatment tank, and the desulfurization agent is selected from refined phosphate rock, according to the amount of SO in phosphoric acid 4 2- Add 1.2 times of the stoichiometric ratio; sodium carbonate and silicon dioxide are selected as the defluorinating agent, sodium carbonate is added according to 1.0 times the stoichiometric ratio of t...

Embodiment 2

[0057] Embodiment 2: Preparation of food-grade phosphoric acid

[0058] In the present embodiment, the composition of raw material wet process dilute phosphoric acid used is as follows:

[0059] P 2 o 5 SO 4 2- F Fe As heavy metal (calculated as Pb) chromaticity

[0060] 28.80% 2.19% 1.68% 0.71% 0.0014% 0.0025% >300

[0061] Continuous production, the process steps are shown in Figure 2, including pretreatment, secondary desulfurization and defluorination, filtration separation, extraction, deep desulfurization, washing, stripping, deep defluorination and concentration.

[0062] (1) Pretreatment

[0063] Pretreatment is carried out in the pretreatment tank, and the desulfurization agent is selected from refined phosphate rock, according to the amount of SO in phosphoric acid 4 2- Add 1.3 times of the stoichiometric ratio; Potassium carbonate and silicon dioxide are selected as the defluorinating agent, potassium carbonate is added according to 1.2 times the s...

Embodiment 3

[0081] Embodiment 3: prepare industrial phosphate

[0082] In the present embodiment, the composition of raw material wet process dilute phosphoric acid used is as follows:

[0083] P 2 o 5 SO 4 2- F Fe As heavy metal (calculated as Pb) chromaticity

[0084] 28.80% 2.19% 1.68% 0.71% 0.0014% 0.0025% >300

[0085] Continuous production, the process steps are shown in Figure 3, which are pretreatment, secondary desulfurization and defluorination, filtration separation, extraction, deep desulfurization, washing, stripping, concentration, and spray drying.

[0086] (1) Pretreatment

[0087] Pretreatment is carried out in the pretreatment tank, and the desulfurization agent is selected from refined phosphate rock, according to the amount of SO in phosphoric acid 4 2- Add 1.1 times of the stoichiometric ratio; sodium carbonate and silicon dioxide are selected as the defluorinating agent, sodium carbonate is added according to 1.0 times the stoichiometric ratio of t...

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Abstract

The invention discloses a method for preparation of technical grade phosphoric acid with wet- process diluted phosphoric acid, which sequentially contains pretreation, secondary desulfurizion and defluorination, filteration and separation, extraction, deeply desulfurization, washing, retrograde extraction and concentration. Different from method for preparation of food-grade phosphoric acid with wet-process diluted phosphoric acid, the pretreating contains not only desulfurization, defluorination, decoloring, but also de-arsenic, de-heavy metal, and defluorination and deep concentration proceeds parallelly after retrograde extraction. The process of preparation of technical grade phosphoric acid with wet- process diluted phosphoric acid sequentially contains pretreation, secondary desulfurization and defluorination, filteration and separation, extraction, deeply desulfurization, washing, retrograde extraction, concentration, spray drying or shotcrete granulation, the extractant using in the process of retrograde extraction being KOH saturated solution or NH4OH saturated solution. With said process, it can decrease the energy consumption and the production cost; and it can produce and purify phosphoric acid, and also directly produce plural of phosphonate with the same device.

Description

[0001] Methods for technical-grade phosphoric acid, food-grade phosphoric acid, and phosphate salts technical field [0002] The invention belongs to a preparation method for purifying phosphoric acid and phosphate, in particular to a method for preparing industrial-grade phosphoric acid, food-grade phosphoric acid and phosphate by using wet-process dilute phosphoric acid as a raw material and adopting a solvent extraction method. Background technique [0003] Various phosphate products produced with thermal phosphoric acid as raw materials play an important role in various fields of the national economy, and are one of the main products for exporting foreign exchange in my country. However, thermal phosphoric acid is a "four high" product with high energy consumption, high pollution, high investment and high cost. With the emergence of the energy crisis and the improvement of people's awareness of environmental prot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/234C01B25/237C01B25/26C01B25/30
Inventor 钟本和李军陈亮龚海燕李燕凤翁贤芬
Owner SICHUAN JINGCUI CHEM TECH
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