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Synthetic method of polyaluminum ferric chloride

A technology of polyaluminum ferric chloride and synthesis method, which is applied in chemical instruments and methods, inorganic chemistry, iron compounds, etc., can solve the problems of unguaranteed basicity of products, many equipment requirements, high cost, etc., and achieve production cost Low, reduce pollution, shorten the production cycle effect

Active Publication Date: 2017-02-22
徐州美利圆环保科技有限公司
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects that the existing method for producing water purifying agents from waste resources has many steps, requires many equipment, high cost, and the basicity of the product cannot be guaranteed, and provides a polyaluminum ferric chloride synthesis method

Method used

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  • Synthetic method of polyaluminum ferric chloride
  • Synthetic method of polyaluminum ferric chloride

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Embodiment

[0024] A synthetic method for polyaluminum ferric chloride, comprising the following steps:

[0025] 1), add 2530t of waste iron-containing hydrochloric acid, 181kg of hydrochloric acid, and 10kg of water into the closed stirred tank to obtain compound waste iron-containing hydrochloric acid, then put the compound waste iron-containing hydrochloric acid into the circulating oxidation reactor, and turn on the circulation pump to start circulation;

[0026] 2), sodium nitrite is configured into a sodium nitrite solution with a mass fraction of 25 wt %;

[0027] 3), slowly add sodium nitrite solution into the circulating oxidation reaction kettle, and feed oxygen at the same time, the total sodium nitrite dosing time is 1.0h, the total sodium nitrite dosing amount is 45kg; the total oxygen feeding amount is 33kg;

[0028] 4), when the reaction temperature reaches 50±5°C, and there is no significant change in the material temperature and the pressure in the circulating oxidation r...

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Abstract

The invention discloses a synthetic method of polyaluminum ferric chloride. The synthetic method comprises the following steps: firstly adjusting the content of Fe<2+> in iron-containing waste hydrochloric acid to be 7.8-8.2wt% and the content of HCl to be 9.0-9.2wt%; then adding a sodium nitrite solution, introducing nitrogen and reacting to obtain an iron trichloride liquid; then adding aluminium slag, aluminium-containing waste hydrochloric acid and hydrochloric acid according to a mass ratio of the iron trichloride liquid to the aluminium slag to aluminium-containing waste hydrochloric acid to hydrochloric acid being (6.9-7.0) to 1 to (3-3.2) to (4.1-4.3) and introducing steam to carry out heating reaction; then adding calcium aluminate powder and water, reacting and carrying out cooling and solid-liquid separation, thus obtaining the finished product polyaluminum ferric chloride. Aluminium-containing waste hydrochloric acid, the aluminium slag and iron-containing waste hydrochloric acid are comprehensively utilized and are converted to a water purifier with high added value. The synthetic method has the beneficial effects that the whole reaction only needs 4-6 hours; the equipment and the process are simple and convenient and feasible; the equipment investment is low; the synthetic method is simple to operate and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a preparation method of polyaluminum ferric chloride, in particular to a method for producing polyaluminum ferric chloride by mainly utilizing aluminum slag, aluminum-containing waste hydrochloric acid and iron-containing waste hydrochloric acid. Background technique [0002] Polyaluminum ferric chloride (PAFC) is an inorganic polymer coagulant formed by the coagulation and hydrolysis of aluminum salt and iron salt. It combines the advantages of aluminum salt and iron salt to purify high turbidity water and low temperature and low turbidity water. The treatment effect is particularly obvious, and it is widely used in tap water and sewage treatment. At present, the main synthesis method is to add ferric chloride to the finished product polyaluminum chloride to obtain a mixed solution. For example, the method disclosed in Chinese patent CN201410420112.2 "Composite Polyaluminum Chloride Hot Metal Treating Agent" is: use polyalumi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00
CPCC01G49/009C01P2006/80
Inventor 贺祝潘文秀
Owner 徐州美利圆环保科技有限公司
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