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Method for synthesizing composite kieselguhr coagulant from kieselguhr waste liquor

A diatomite and coagulant technology, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of weak adsorption and bridging function of coagulants and low salinity, so as to strengthen the adsorption and bridging function, increase the The effect of high salinity and sedimentation speed

Inactive Publication Date: 2013-09-11
JILIN YINDA WATER AFFAIR TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the diatomite coagulant prepared by the existing method has a small basicity of PAFS or PAFC and weak adsorption and bridging function of the coagulant, and provide a diatomite waste liquid Method for synthesizing composite diatomite coagulant

Method used

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  • Method for synthesizing composite kieselguhr coagulant from kieselguhr waste liquor
  • Method for synthesizing composite kieselguhr coagulant from kieselguhr waste liquor
  • Method for synthesizing composite kieselguhr coagulant from kieselguhr waste liquor

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specific Embodiment approach 1

[0032] Specific embodiment one: the present embodiment utilizes diatomite waste liquid to synthesize the method for composite diatomite coagulant, realizes according to the following steps:

[0033] 1. Preparation of diatomite concentrate: impregnate low-grade diatomite with sulfuric acid solution or hydrochloric acid solution, ultrasonicate for 3-10 hours under the condition of power 50-250w, and filter with suction to obtain Al-containing 2 (SO 4 ) 3 and Fe 2 (SO 4 ) 3 or AlCl 3 and FeCl 3The waste liquid and the impregnated diatomite are then washed with deionized water until neutral, dried at 105°C for 4-5 hours, and ground through a 60-200 mesh sieve to obtain diatomite ;

[0034] 2. Modification of diatom concentrate: adding the diatom concentrate obtained in step 1 to an organic reagent or an inorganic reagent for modification, and drying at 105° C. after suction filtration to obtain a modified diatom concentrate;

[0035] 3. Synthesis of composite diatomite coa...

specific Embodiment approach 2

[0042] Embodiment 2: This embodiment differs from Embodiment 1 in that in step 1, low-grade diatomite is impregnated with sulfuric acid solution or hydrochloric acid solution, and ultrasonicated for 6 hours under the condition of power 150w. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0043] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in step 1, dry at 105° C. for 4.5 hours, and grind through a 100-mesh sieve. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention relates to a method for synthesizing a composite kieselguhr coagulant, particularly a method for synthesizing a composite kieselguhr coagulant from kieselguhr waste liquor. The invention aims to solve the problems of small basicity of PAFS (polymeric aluminum ferric sulfate) or PAFC (polymeric aluminum ferric chloride) and weak bridge adsorbing function in the kieselguhr coagulant prepared by the existing method. The method comprises the following steps: 1. preparation of fine kieselguhr; 2. modification of the fine kieselguhr; and 3. synthesis of the composite kieselguhr coagulant. The composite kieselguhr coagulant synthesized by the method provided by the invention has the advantages of faovorable removal rate for turbidity and CODCr, small addition amount, wide pH applicability and low price, and enhances the economical efficiency when being used for treating wastewater; and in the composite kieselguhr coagulant preparation process, the previously modified kieselguhr is added to enhance the hydroxy polymerization degree in the PAFS or PAFC preparation process by utilizing the electropositivity on the surface of the modified kieselguhr, thereby greatly increasing the basicity of the PAFS or PAFC and enhancing the bridge adsorbing function of the coagulant.

Description

technical field [0001] The invention relates to a method for synthesizing a composite diatomite coagulant. Background technique [0002] my country is rich in diatomite resources and is one of the countries with the largest reserves of diatomite in the world. Jilin Province is one of the provinces and cities with the largest storage of diatomite in my country, accounting for 51% of the country's total. The development and application of diatomite high value-added products has become a new strategy that is mainly cultivated in the "Twelfth Five-Year" science and technology plan of Jilin Province industry. Therefore, it is of great significance to develop a multifunctional and high-efficiency composite diatomite coagulant and apply it to the recovery and utilization of wastewater. Diatomaceous earth is a biological siliceous rock composed of the siliceous remains of diatoms and other microorganisms. The main component is SiO 2 (About 65%~90%), Al 2 o 3 (About 15%~20%), th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 张瑛洁马军李全冬赵守霞
Owner JILIN YINDA WATER AFFAIR TECH
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