Method for preparing coagulant and application thereof

A coagulant and gel technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of secondary pollution and high treatment cost, and achieve reduction The effect of energy consumption

Active Publication Date: 2015-06-24
重庆能兴科技发展有限公司
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  • Application Information

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Problems solved by technology

Although there are many treatment methods, the treatment cos

Method used

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  • Method for preparing coagulant and application thereof

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Effect test

Embodiment 1

[0026] Embodiment 1: a kind of preparation method of coagulant, comprises the steps:

[0027] (1) Accurately weigh aluminum hydroxide and sodium hydroxide at a mass ratio of 1.8:1 and place it in a reaction vessel; add a small amount of water to control the mass concentration of the sodium hydroxide solution to 50%; The temperature of the system was raised to slightly boiling; the complete reaction required 30 min;

[0028] (2) After the reaction solution in step (1) is cooled to room temperature, quickly add hydrochloric acid solution with a volume concentration of 19%, control the basicity of the reaction solution to 2.4, and stir rapidly to obtain a gel containing active aluminum hydroxide The mixed solution of polyaluminum chloride with high salinity;

[0029] (3) After the aluminum hydroxide gel-polyaluminum chloride mixed solution obtained in step (2) is mixed evenly, heat at 80°C for 0.5 hour; and age for three days to obtain a stable coagulant product.

Embodiment 2

[0030] Embodiment 2: a kind of preparation method of coagulant comprises the steps:

[0031] (1) Accurately weigh aluminum hydroxide and sodium hydroxide at a mass ratio of 1.5:1 and place them in the reaction vessel; add a small amount of water to control the mass concentration of the sodium hydroxide solution to 60%; The temperature of the system was raised to slightly boiling; it took 25 min for complete reaction;

[0032] (2) After the reaction solution in step (1) is cooled to room temperature, quickly add hydrochloric acid solution with a volume concentration of 28%, control the basicity of the reaction solution to 2.7, and stir rapidly to obtain a gel containing active aluminum hydroxide The mixed solution of polyaluminum chloride with high salinity;

[0033] (3) After the aluminum hydroxide gel-polyaluminum chloride mixed solution obtained in step (2) is mixed evenly, heat at 60°C for 0.5 hour; and age for three days to obtain a stable coagulant product.

Embodiment 3

[0034] Embodiment 3: a kind of preparation method of coagulant, comprises the steps:

[0035] (1) Accurately weigh aluminum hydroxide and sodium hydroxide at a mass ratio of 1.8:1 and place it in the reaction vessel; add a small amount of water to control the mass concentration of the sodium hydroxide solution to 60%; The temperature of the system was raised to slightly boiling; it took 25 min for complete reaction;

[0036] (2) After the reaction solution in step (1) is cooled to room temperature, quickly add hydrochloric acid solution with a volume concentration of 19%, control the basicity of the reaction solution to 2.4, and stir rapidly to obtain a gel containing active aluminum hydroxide The mixed solution of polyaluminum chloride with high salinity;

[0037] (3) After the aluminum hydroxide gel-polyaluminum chloride mixed solution obtained in step (2) is mixed evenly, heat at 80°C for 1 hour; and age for three days to obtain a stable coagulant product.

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Abstract

The invention discloses a method for preparing a coagulant and an application thereof. The method comprises the following steps: by taking industrial aluminium hydroxide as a main raw material, reacting with a sodium hydroxide solution under high temperature, cooling to room temperature, adding a hydrochloric acid solution into the reaction solution, controlling the basicity of the reaction solution to 2.4-2.7, and rapidly stirring to obtain an aluminium trichloride mixed solution with high basicity containing an active aluminium hydroxide gel; and heating and aging to obtain the coagulant after uniformly mixing the aluminium trichloride mixed solution with high basicity containing the active aluminium hydroxide gel. The invention also discloses an application of the coagulant prepared by the method for removing heavy metals in the water body. The preparation method provided by the invention is simple in process, low in energy consumption and small in device corrosion; and the obtained coagulant is good in stability without changing within 6 months, convenient to use and has a good removing effect on the heavy metals and the COD in the water body.

Description

technical field [0001] The invention belongs to the technical field of flocculant preparation, and relates to a preparation method and application of a coagulant, in particular to a preparation method and application of a coagulant for heavy metal treatment in water bodies. Background technique [0002] Coagulation is a widely used water treatment method, which has the advantages of high efficiency, low cost, and convenient use. Coagulant is the core of coagulation method, and its quality will largely determine the effect of water treatment. Coagulants are mainly divided into inorganic coagulants, organic flocculants, and microbial flocculants. The inorganic coagulants are divided into traditional inorganic coagulants and inorganic polymer coagulants. At present, the commonly used inorganic polymer coagulants are mainly polymeric aluminum salt coagulants and polymeric iron salt coagulants. [0003] Polyaluminum chloride is a widely used inorganic polymer coagulant. It...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F1/62
Inventor 郑怀礼王小平唐晓旻郑欣钰龚曼瑀周于皓徐先明赵纯张育新
Owner 重庆能兴科技发展有限公司
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