Polysilicate-metals composite flocculant and preparation method thereof
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A polysilicate metal salt and composite flocculant technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of increased water treatment costs, enhanced coagulants, etc., and achieve strong adaptability to water temperature and pH value, growth The effect of large molecular chains and flocs
Inactive Publication Date: 2011-11-23
HARBIN INST OF TECH
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[0003] The present invention is to solve the technical problem that the existing polysilicate metal salt composite coagulant needs to add an alkalizing agent to enhance the degree of alkalization and polymerization of the coagulant, which increases the cost of water treatment, and provides polysilicon Acid metal salt composite flocculant and preparation method thereof
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specific Embodiment approach 1
[0008] Specific embodiment one: The polysilicate metal salt composite flocculant of this embodiment consists of 35-45 parts of silicate, 25-40 parts of aluminum salt, 25-40 parts of iron salt, 0.1-45 parts by weight. Made of 30 parts of adjuvant A and 0.1-30 parts of adjuvant B, wherein the silicate is sodium silicate or potassium silicate, the aluminum salt is aluminum sulfate or aluminum chloride, and the iron salt is ferric sulfate or ferric chloride , adjuvant A is one or a combination of phosphate, calcium oxide, polyacrylamide and chitosan, and adjuvant B is sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate or potassium bicarbonate.
[0009] In this embodiment, when the adjuvant A is a composition, each adjuvant is combined in any ratio.
[0010] In this embodiment, when the adjuvant B is a composition, each adjuvant is combined in any ratio.
[0011] The flocculant of this embodiment can be used for removing turbidity in ...
specific Embodiment approach 2
[0012] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the polysilicate metal salt composite flocculant consists of 37-42 parts of silicate, 28-38 parts of aluminum salt, 28-38 parts by weight. It is prepared by 38 parts of iron salt, 0.5-28 parts of adjuvant A and 0.5-28 parts of adjuvant B. Others are the same as the first embodiment.
specific Embodiment approach 3
[0013] Specific embodiment three: The difference between this embodiment and specific embodiment one is that the polysilicate metal salt composite flocculant is composed of 40 parts of silicate, 30 parts of aluminum salt, 30 parts of iron salt, Prepared with 10 parts of adjuvant A and 10 parts of adjuvant B. Others are the same as the first embodiment.
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Abstract
The invention discloses polysilicate-metals composite flocculant and a preparation method thereof and relates to flocculant for water treatment and the preparation method thereof. The method aims to solve the technical problem that the alkalization degree and polymerization degree of flocculant are increased by externally increasing alkalizer so water treatment cost is increased in the conventional polysilicate-metals composite flocculant. The polysilicate-metals composite flocculant is prepared from silicate, aluminum salt, ferric salt, an assistant agent A and an assistant agent B in a weight ratio, wherein the assistant agent A is one or combination of phosphate, calcium oxide, polyacrylamide, and chitosan; and the assistant agent B is one or combination of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate or potassium bicarbonate. The method comprises the following steps of: adjusting pH of the aqueous solution of silicate, stirring and standing to obtain solution of polysilicate, and then adding the aluminum salt, the ferric salt, the assistant agent A and the assistant agent B, and mixing uniformly to obtain the polysilicate-metals composite flocculant. Other agents are not needed to be added, and the polysilicate-metals composite flocculant is low in cost and can be used for the field of water treatment.
Description
technical field [0001] The invention relates to a flocculant for water treatment and a preparation method thereof. Background technique [0002] Flocculation is an important water purification method widely used in drinking water treatment and sewage treatment. In drinking water treatment, flocculation sedimentation is an effective means to remove suspended solids and colloids in raw water; in sewage treatment, it can be used as pretreatment before biochemical treatment, or can be strengthened synchronously with biochemical treatment, which can efficiently remove suspended solids and improve Biodegradability of sewage. At present, the commonly used polysilicate metal salt composite coagulant needs to add a large amount of alkalizing agent, such as NaOH, to enhance the degree of alkalization and polymerization of the coagulant, which increases the cost of water treatment. Contents of the invention [0003] The present invention is to solve the technical problem that the e...
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