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Washing method of ferric phosphate

A washing method and iron phosphate technology, which are applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as labor intensity, poor quality stability, and difficult wastewater treatment, so as to improve product quality, stability, The effect of avoiding the difficulty of wastewater treatment

Pending Publication Date: 2019-06-18
乳源东阳光新能源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects and deficiencies of poor quality stability of existing iron phosphate washing products, labor intensity, and difficulty in wastewater treatment, and provide a washing method for iron phosphate. The method adopts four-stage countercurrent washing, adopts Washing with hot pure water as the washing liquid not only realizes zero discharge of washing water, but also avoids the influence of phosphoric acid washing liquid on the final iron phosphate and its product quality

Method used

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  • Washing method of ferric phosphate
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  • Washing method of ferric phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A method for washing ferric phosphate, comprising the steps of:

[0037]First set the initial temperature of the hot pure water heated by the steam heater on the DCS system to 45°C, the high and low liquid level values ​​of the water tanks and washing liquid reuse tanks at all levels, and control the four levels through the high and low liquid level values ​​​​of the water tanks at all levels The mass ratio of the total water in the water tank to the iron phosphate material (calculated as dry powder) is 80:1, and the upper limit of the conductivity of the washing water and washing liquid in the third-level water tank is 400us / cm.

[0038] S1. First-level washing: After the setting is completed, let the DCS automatically run the iron phosphate washing program. The DCS system controls the discharge solenoid valve of the aging kettle to transfer the aged iron phosphate material to the fully automatic vertical filter press, and the filtration process is performed first. , a...

Embodiment 2

[0045] A method for washing ferric phosphate, comprising the steps of:

[0046] First set the initial temperature of the hot pure water heated by the steam heater on the DCS system to 20°C, the high and low liquid level values ​​of the water tanks at all levels and the washing liquid reuse tank, and control the four levels through the high and low liquid level values ​​​​of the water tanks at all levels The mass ratio of the total water in the water tank to the iron phosphate material (calculated as dry powder) is 80:1, and the upper limit of the conductivity of the washing water and washing liquid in the third-level water tank is 400us / cm.

[0047] S1. First-level washing: After the setting is completed, let the DCS automatically run the iron phosphate washing program. The DCS system controls the discharge solenoid valve of the aging kettle to transfer the aged iron phosphate material to the fully automatic vertical filter press, and the filtration process is performed first. ...

Embodiment 3

[0054] A method for washing ferric phosphate, comprising the steps of:

[0055] First set the initial temperature of the hot pure water heated by the steam heater on the DCS system to 30°C, the high and low liquid level values ​​of the water tanks and the washing liquid reuse tanks at all levels, and control the four levels through the high and low liquid level values ​​​​of the water tanks at all levels The mass ratio of the total water volume of the water tank to the iron phosphate material (calculated as dry powder) is 20:1, and the upper limit of the conductivity of the washing water and washing liquid in the third-level water tank is 400us / cm.

[0056] S1. First-level washing: After the setting is completed, let the DCS automatically run the iron phosphate washing program. The DCS system controls the discharge solenoid valve of the aging kettle to transfer the aged iron phosphate material to the fully automatic vertical filter press, and the filtration process is performed...

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Abstract

The invention provides a washing method of ferric phosphate. According to the washing method, four stage counter current washing is adopted, a first stage washing liquid, a second stage washing liquid, a third stage washing liquid, and a fourth stage washing liquid are all hot purified water; after four stage washing, an obtained slurry is subjected to drying stage; the first stage washing liquidis recycled back into an aging working section, so that washing water zero discharge is realized, and hot purified water heating cost is reduced; washing water is not all subjected to circulation washing, and working section piecewise recycling is adopted, so that washing water conductivity balance state is easily to achieve; hot purified water is adopted as washing liquid, so that waste water processing difficulty increasing, and iron / phosphorus ratio reduction of ferric phosphate caused by adding of phosphoric acid or other additives are avoided, and it is beneficial for improvement of product quality; an on-line conductivity instrument is adopted for monitoring washing liquid conductivity, and washing water temperature is increased with increasing of washing liquid conductivity, so thatwashing effect is improved; washing process full automation is realized, no manual operation and detection are needed, human labor cost is reduced, and artificial detection error and time-delay are avoided.

Description

technical field [0001] The invention relates to the technical field of inorganic compound production, in particular to a method for washing iron phosphate. Background technique [0002] Iron phosphate is mainly used in the manufacture of lithium iron phosphate battery materials, catalysts and ceramics. The production process of iron phosphate is to oxidize the ferrous iron solution to obtain the ferric iron solution, react the ferric iron solution and phosphorus solution in the reactor to obtain a precipitate, wash and filter the precipitate, remove impurities, and dry to obtain ferric phosphate. In the current iron phosphate washing method, countercurrent washing is mostly used. During the countercurrent washing process, the conductivity of the washing solution increases and the pH value decreases due to the recycling of the washing solution. On the other hand, in order to improve the washing efficiency and reduce the amount of washing water in the washing process, washing...

Claims

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Application Information

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IPC IPC(8): C01B25/37
Inventor 张军温益凡
Owner 乳源东阳光新能源材料有限公司
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