Phosphoric acid impurity removal process in preparing activated carbon by phosphoric acid method

A technology for preparing activated carbon and phosphoric acid, which is applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as low efficiency, high refining cost, and incomplete refining by chemical precipitation, so as to improve refining efficiency and use Effect of reducing efficiency and impurity content

Inactive Publication Date: 2012-12-26
FUJIAN YUANXIANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to overcome the disadvantages of incomplete refining by chemical precipitation method and high cost and low efficiency of ion exchange method in the prior art, and provide a method for preparing activated carbon containing heterophosphoric acid with high purity, high efficiency and low cost. phosphoric acid removal process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Put 1 ton of heterophosphoric acid into reactor 1, slowly add 100 kg of concentrated sulfuric acid under stirring to form a large amount of calcium sulfate precipitates. Stirring was continued for 1 hour to coarsen and stabilize the calcium sulfate crystals. Calcium sulfate crystals were separated by filtration with a plate and frame filter press, and the filtrate was sent to reactor 2. Add 10 kilograms of solid barium phosphate in reactor 2 under stirring, continue to stir at a slow speed for 2 hours and make the sulfate ion in the solution convert to barium sulfate precipitation. Filtration to obtain a preliminary refined phosphoric acid solution.

[0034] Slowly inject 800 kg of the above preliminarily refined phosphoric acid solution into an ion exchange tower with a diameter of 0.2 meters and a height of 8 meters, and then enter water. Collect the effluent phosphoric acid solution. The outlet of the ion exchange tower is equipped with an online concentration det...

Embodiment 2

[0038] Put 1 ton of heterophosphoric acid into reactor 1, slowly add 100 kg of concentrated sulfuric acid under stirring to form a large amount of calcium sulfate precipitates. Stirring was continued for 1 hour to coarsen and stabilize the calcium sulfate crystals. Calcium sulfate crystals were separated by filtration with a plate and frame filter press, and the filtrate was sent to reactor 2. Add 10 kilograms of solid barium phosphate in reactor 2 under stirring, continue to stir at a slow speed for 2 hours and make the sulfate ion in the solution convert to barium sulfate precipitation. Filtration to obtain a preliminary refined phosphoric acid solution.

[0039] Slowly inject 1,000 kg of the above preliminary refined phosphoric acid solution into an ion exchange tower with a diameter of 0.2 meters and a height of 10 meters, and then enter water. Collect the effluent phosphoric acid solution. The outlet of the ion exchange tower is equipped with an online concentration de...

Embodiment 3

[0041]Put 1 ton of heterophosphoric acid into reactor 1, slowly add 100 kg of concentrated sulfuric acid under stirring to form a large amount of calcium sulfate precipitates. Stirring was continued for 1 hour to coarsen and stabilize the calcium sulfate crystals. Calcium sulfate crystals were separated by filtration with a plate and frame filter press, and the filtrate was sent to reactor 2. Add 10 kilograms of solid barium phosphate in reactor 2 under stirring, continue to stir at a slow speed for 2 hours and make the sulfate ion in the solution convert to barium sulfate precipitation. Filtration to obtain a preliminary refined phosphoric acid solution.

[0042] Slowly inject 4,000 kg of the above preliminary refined phosphoric acid solution into an ion exchange tower with a diameter of 0.4 meters and a height of 12 meters, and then enter water. Collect the effluent phosphoric acid solution. The outlet of the ion exchange tower is equipped with an online concentration det...

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Abstract

The invention discloses a phosphoric acid impurity removal process in preparing activated carbon by a phosphoric acid method. The phosphoric acid impurity removal process comprises the following steps of: (1) adding superfluous concentrated sulfuric acid solutions to a phosphoric acid solution in a first reactor, and stirring to form a calcium sulfate precipitate; (2) filtering to separate out calcium sulfate impurities, and sending filter liquor to a second reactor; (3) adding barium phosphonate or barium hydroxide into the second reactor to ensure that excess sulfuric acid is formed into a barium sulfate precipitate, and filtering to obtain a preliminarily refined phosphoric acid solution; and (4) flowing the preliminarily refined phosphoric acid solution through H type cation exchange resin to remove cation impurities to obtain a finally refined phosphoric acid solution. The phosphoric acid impurity removal process has the advantages that because calcium ions are firstly removed in the impurity-containing phosphoric acid, more impurity-containing phosphoric acid can be refined in an exchange process at a time, so that the use efficiency of an ion exchange is improved, and a phosphoric acid solution with a higher concentration can be simultaneously obtained.

Description

technical field [0001] The invention relates to a process flow for preparing activated carbon by a phosphoric acid method, in particular to a phosphoric acid impurity removal process for preparing activated carbon by a phosphoric acid method. Background technique [0002] The production of activated carbon with phosphoric acid as an activator is called phosphoric acid activated carbon. The phosphoric acid used in production must be high-purity thermal phosphoric acid. In order to control the production cost of activated carbon, phosphoric acid must be recovered and recycled during the production process. Since sawdust, the basic raw material for the production of activated carbon, contains impurities such as calcium, magnesium, iron, potassium, and sodium, after the phosphoric acid is used repeatedly for a period of time, the phosphoric acid solution will be enriched with the above metal impurity ions. When the content of impurity ions in phosphoric acid solution exceeds a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12C01B32/342
Inventor 王升锦王承辉李建华
Owner FUJIAN YUANXIANG CHEM
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