Preparation method for polymeric ferric sulfate

A technology of polymerizing ferric sulfate and mixed solution, which is applied in ferric sulfate, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of narrow application range, yellowing color, poor intuitive vision, etc., and achieves high turbidity removal rate. Effect

Inactive Publication Date: 2015-12-16
HAINAN YIJING ENVIRONMENTAL PROTECTION CO LTD
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Problems solved by technology

However, in the process of sewage and wastewater treatment in various industries, the use of polyferric sulfate is relatively narrower than that of polyaluminum chloride. The reason is that when treating w

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[0009] The present invention provides a preparation method of polymeric ferric sulfate, which comprises the following steps:

[0010] a), dilute sodium silicate with water to SiO 2 After the content is 4%-5%, pour it into the reaction kettle, then add 4%-6% dilute sulfuric acid solution to the reaction kettle, and stir for 20-30 minutes, when the viscosity reaches the concentration measured by the Tu's viscometer When it is 2'20"-2'40", add ferrous sulfate and hydroquinone to the reaction kettle in turn, stir fully for 10-20 minutes to prepare active silicic acid solution;

[0011] b). Add the active silicic acid solution, the catalyst nitrite solution and the acid-washed iron-containing wastewater solution in a weight ratio of 1:2:30 into the reactor and stir, and at the same time pass in oxygen. Under the condition of ℃, the polymerization reaction takes place, and the reaction time is 3-4 hours. After it is fully neutralized and polymerized, the mixed solution is obtained, and c...

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Abstract

The invention discloses a preparation method for polymeric ferric sulfate. The preparation method includes the following steps: after water is used for diluting sodium silicate until SiO2 content is 4 to 5 percent, the diluted sodium silicate is poured into a reaction kettle, dilute sulphuric acid solution, the concentration of which is 4 to 6 percent, is then added into the reaction kettle, agitation is carried out for 20 to 30 minutes, ferrous sulfate and hydroquinone are sequentially added into the reaction kettle when viscosity reaches the concentration of 2 minute 20 second to 2 minute 40 second determined by a viscometer, and after 10 to 20 minutes of sufficient agitation, activated silicic acid solution is prepared. The process of the method disclosed by the invention is simple, moreover, the coagulation effect of the prepared polymeric ferric sulfate coagulant is good, the turbidity removal rate is high, reaching 96 percent, and furthermore, each index of the prepared polymeric ferric sulfate coagulant meets the requirement of GB14591-2006 polymeric ferric sulfate as water treatment agent.

Description

technical field [0001] The invention relates to a preparation method of polyferric sulfate. Background technique [0002] As we all know, polyferric sulfate (referred to as "polyferric"), like polyaluminum chloride, is the most widely used inorganic coagulant for industrial sewage and wastewater treatment in the world. Ferric sulfate has the effect of removing suspended solids in wastewater, removing COD and BOD, removing organic matter such as phenol and benzene and other harmful impurities (such as: sulfide, cyanide and some phosphides) and heavy metals, so polyferric sulfate is widely used in my country. It is widely used in wastewater treatment in many industries. However, in the process of sewage and wastewater treatment in various industries, the use of polyferric sulfate is relatively narrower than that of polyaluminum chloride. The reason is that when treating wastewater, the color of the effluent after adding polyferric sulfate will produce "yellowish" disadvantages...

Claims

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Application Information

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IPC IPC(8): C02F1/52C01G49/14
Inventor 王家雷贺祝张有彬潘德扣
Owner HAINAN YIJING ENVIRONMENTAL PROTECTION CO LTD
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