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Method for preparing poly-aluminum ferric silicate sulfate flocculating agent

A technology of polymerizing ferric aluminum silicate and flocculant, which is applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sewage treatment, etc. It can solve problems such as being easily affected by pH and single raw material, and achieve flocculation effect Good, wide range of use, increase the effect of silicon source diversity

Inactive Publication Date: 2015-04-01
SHANGHAI INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of preparation method of polyaluminosilicate ferric flocculant in order to solve the technical problems such as above-mentioned single raw material, being easily influenced by pH, this preparation method uses tetraethyl orthosilicate as silicon source, increases silicon The selectivity of the source, and the obtained polyaluminum iron silicate flocculant is less affected by pH, and the flocculation effect is better

Method used

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  • Method for preparing poly-aluminum ferric silicate sulfate flocculating agent

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Embodiment 1

[0020] A kind of preparation method of polyaluminosilicate ferric flocculant, specifically comprises the following steps:

[0021] (1) Take a 500ml beaker, add 200ml of distilled water, boil the distilled water in the beaker, then control the dropping rate at 1ml / mim, slowly add 10ml of tetraethyl orthosilicate into the boiling water at a stirring speed of 500r / min, drop After the addition, continue to control the same rotation speed and stir for 30 minutes, then adjust the pH to 10 with sodium hydroxide solution, and mature for 4 hours to obtain silicic acid sol;

[0022] The amount of ethyl orthosilicate is calculated by volume ratio, that is, distilled water: ethyl orthosilicate is 20:1;

[0023] The above-mentioned addition of tetraethyl orthosilicate to boiling water must be stirred slowly and quickly, because ethanol will be generated during the reaction between tetraethyl orthosilicate and boiling water. If the drop rate is too fast, it may cause an explosion;

[0024]...

Embodiment 2

[0029] A kind of preparation method of polyaluminosilicate ferric flocculant, specifically comprises the following steps:

[0030] (1) Take a 500ml beaker, add 200ml of distilled water, boil the distilled water in the beaker, then control the rate of addition to 1ml / min, slowly add 20ml of ethyl orthosilicate into the boiling water at a stirring speed of 500r / min, drop After the addition, continue to control the same rotation speed and stir for 40 minutes, then use sodium hydroxide solution to adjust the pH to 11, and ripen for 4 hours to obtain silicic acid sol;

[0031] The amount of ethyl orthosilicate is calculated by volume ratio, that is, distilled water: ethyl orthosilicate is 10:1;

[0032] The above-mentioned addition of tetraethyl orthosilicate to boiling water must be slowly and quickly stirred, because ethanol will be generated during the reaction between tetraethyl orthosilicate and boiling water, if the drop rate is too fast, it may cause an explosion;

[0033] ...

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Abstract

The invention discloses a method for preparing a poly-aluminum ferric silicate sulfate flocculating agent. The method comprises the following steps: reacting tetraethyl orthosilicate serving as raw material with boiling water to generate silica sol; controlling the rotating speed to be 400 revolutions per minute, adding an aluminum salt into the silica sol at the temperature of 50 DEG C, adding a ferric salt after the aluminum salt is completely dissolved, controlling the rotating speed to be 100 to 200 revolutions per minute, further stirring until the solution becomes a reddish brown transparent solution, stopping stirring, keeping in a dark place and curing for 4-6 hours, thereby obtaining the poly-aluminum ferric silicate sulfate flocculating agent. According to the amount of the aluminum salt and the ferric salt, the molar ratio of the total amount of Al and Fe to Si in the silica sol is 1:1, and the ratio of Al to Fe is 1.2-2:1. According to the preparation method, tetraethyl orthosilicate serves as a silicon source, the selectivity of the silicon source is improved, and the obtained poly-aluminum ferric silicate sulfate flocculating agent is slightly influenced by the pH value and is good in flocculating effect; the preparation method is simple in process, convenient to operate, low in requirements on reaction equipment and suitable for large-scale production.

Description

technical field [0001] The invention relates to a preparation method of a polyaluminum iron silicate flocculant. Background technique [0002] Polymerized aluminum iron silicate (PSAF) is a new type of water-soluble polymer electrolyte. It is mainly used to purify drinking water, and can also be used for special water quality treatment of water supply, cadmium removal, fluorine removal, radioactive pollution removal, oil slick removal, etc. In addition, it is widely used in industrial wastewater treatment, such as printing and dyeing wastewater, in foundry, papermaking, medicine, leather, etc. It has an immediate effect on the treatment of sewage in the field of sewage treatment, and is currently a very popular sewage treatment agent. [0003] At present, the most commonly used method for synthesizing polyaluminum iron silicate is to use silicate solution as raw material, activate it to generate silicic acid under acidic conditions, and then add aluminum salt and iron sal...

Claims

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Application Information

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IPC IPC(8): C02F1/52
CPCC02F1/5245
Inventor 韩生荣绍丰刘程陈永悦石磊朱建英马鹏刘亚锋
Owner SHANGHAI INSTITUTE OF TECHNOLOGY
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