Method for preparing technical grade phosphate using wet method phosphoric acid as raw material

A wet-process phosphoric acid, industrial-grade technology, applied in the direction of phosphate, phosphorus oxyacid, etc., can solve the problems of large volume of equipment in the stripping process, slow two-phase clarification and separation speed, increased energy consumption and expenditure, etc., to achieve separation coefficient Increase, reduce energy consumption, and reduce the effect of the process

Inactive Publication Date: 2007-07-11
YUNNAN CHEM RES INST
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  • Abstract
  • Description
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Problems solved by technology

But when using this technology to produce industrial-grade phosphate, there are also the following technical problems: 1. The industrial-grade or food-grade phosphoric acid obtained with water as stripping agent has a long technical process when used to produce phosphate, and phosphoric acid is Among them, it is repeatedly concentrated and diluted, which increases unnecessary energy consumption and expenditure; 2. Water is a necessary raw material for the production of industrial-grade or food-grade phosphoric acid in the solvent extraction process, but when it is used for the production of phosphate, the difference in density between water and solvent is very large Small, two-phase clarification separation speed is slow, and phase separation time is long, which leads to the disadvantages of large equipment volume and high investment in the stripping process, and in actual operation, there may be problems such as solvent loss caused by incomplete separation of solvents, so it is necessary to improve it further

Method used

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  • Method for preparing technical grade phosphate using wet method phosphoric acid as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] ——Preparation of technical grade sodium dihydrogen phosphate

[0023] The composition of raw material wet-process phosphoric acid used is as follows (wt%):

[0024] Element

P 2 o 5

F

SO 3

Fe 2 o 3

al 2 o 3

MgO

As

Pb

Org.

content

%

48.67

0.70

3.17

1.31

0.34

0.60

0.004

0.007

0.05

[0025] Continuous production, the process flow is shown in Figure 1, including pretreatment, extraction, washing, stripping, solvent recovery, and post-concentration treatment procedures.

[0026] (1) Pretreatment

[0027] The pretreatment is carried out in two steps. In the first step, phosphate rock powder is added as a desulfurizer, and a mixture of sodium carbonate and sodium sulfide is used to remove fluorine, arsenic and heavy metals; 4 2- 1.20 times of the stoichiometric ratio is added, and the defluorination, arsenic...

Embodiment 2

[0041] ——Preparation of industrial grade disodium hydrogen phosphate

[0042] In this embodiment, the composition and flow process of the raw material wet-process phosphoric acid used are the same as those in Embodiment 1. The processing condition that the present embodiment adopts and purification auxiliary agent (containing extraction agent) are all identical with embodiment 1 except following items:

[0043] Desulfurizer according to SO in phosphoric acid 4 2- 1.35 times the stoichiometric ratio is added, and the defluorination, arsenic and heavy metal agents are added according to 1.6 times the stoichiometric ratio of fluorine in phosphoric acid. The consumption of activated carbon is 0.2% of the mass of phosphoric acid. The back extraction is carried out in the extraction clarification tank and / or extraction tower, the extraction agent is 15% sodium carbonate aqueous solution, the ratio of the organic phase to the water phase is 4:1, and the reaction temperature is contr...

Embodiment 3

[0047] ——Preparation of industrial grade potassium dihydrogen phosphate

[0048] In this embodiment, the composition and flow process of the raw material wet-process phosphoric acid used are the same as those in Embodiment 1. The processing condition that the present embodiment adopts and purification auxiliary agent (containing extraction agent) are all identical with embodiment 1 except following items:

[0049] Back extraction is carried out in the extraction clarification tank and / or extraction tower, the extraction agent is 10% potassium hydroxide aqueous solution, the ratio of the organic phase to the water phase is 4:1, and the reaction temperature is controlled below 50°C; The tank is adjusted to pH=4.2-4.6 with industrial grade potassium hydroxide.

[0050] The technical grade potassium dihydrogen phosphate prepared by the present embodiment, the content of relevant components is as follows:

[0051] Element

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Abstract

The invention discloses a making method of industry-grade phosphate based on wet process phosphoric acid as raw material, which comprises the following steps: desulfurizing; defluorinating; stripping arsenic; removing heavy metal; decoloring; extracting predisposed wet process phosphoric acid through compound organic solvent of ketone and phosphate ester; washing; reextracting; condensing; post-processing to obtain the product; adopting alkali solution of potassium carbonate, sodium carbonate or alkaline-earth metal as extractor.

Description

technical field [0001] The present invention relates to the preparation of phosphates. Specifically, it relates to a method for preparing industrial-grade phosphate using wet-process phosphoric acid as a raw material. Background technique [0002] Due to the high energy consumption of the production of thermal phosphoric acid, with the increasing shortage of energy, people are more and more willing to use wet phosphoric acid to prepare industrial grade phosphate products. However, wet-process phosphoric acid contains relatively high impurities, and it must be purified before it can be used for the production and preparation of industrial-grade phosphate. For the purification of wet-process phosphoric acid, there are mainly chemical precipitation method, ion exchange method, phosphoric acid concentration purification method, solvent extraction method and crystallization method. At present, solvent extraction method is generally used in industry. [0003] The technology of s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/26
Inventor 方晓峰王志刚倪双林陈洪来
Owner YUNNAN CHEM RES INST
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