Preparation method of composite polyferric sulfate flocculating agent for industrial wastewater

Abstract

The invention discloses a preparation method of a composite polymeric ferric sulfate flocculant for industrial wastewater. The preparation method of the composite polymeric ferric sulfate flocculant comprises the following steps: dissolving 10-16 g of ferrous sulfate heptahydrate in 30-100 mL of water to prepare a ferrous sulfate solution; and then adjusting the content of SO4<2-> of the solutionby using 0.40-1.20 mL of concentrated sulfuric acid so as to allow a molor ratio of SO4<2-> to Fe<2+> to be 1.2-1.4. According to the invention, since the rotating directions of a second rotating motor and a first rotating motor are opposite, raw materials can be stirred, air flowing is accelerated and drying efficiency is improved under the action of the second rotating motor and the first rotating motor; and through the arrangement of a movable plate, a screw rod and an inserting groove, a containing barrel is convenient to mount and dismount and easy to maintain and replace, and fetching and discharging of a material are facilitated.

Description

technical field [0001] The invention relates to the technical field of flocculants, in particular to a preparation method of a composite polymeric ferric sulfate flocculant used for industrial wastewater. Background technique [0002] Inorganic polymer flocculant is a new type of water treatment agent developed on the basis of traditional aluminum salt and iron salt flocculants. Traditional aluminum salt and iron salt flocculants have been used for a long time, but there are many problems in the process of water treatment. They were replaced by inorganic polymer flocculants that gradually developed rapidly in the late 1960s. The latter has better performance than the former. Excellent flocculation effect and low price. So far, there have been quite large-scale productions in the United States, Japan, Western Europe, and Russia, and the process control automation has been achieved, and the product quality is stable. With the development of my country's food processing indus...

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Problems solved by technology

[0003] In the patent No. CN105800749A, a preparation method of solid polyferric sulfate flocculant is disclosed; but the method has the following defects: 1, it can not play a good dispersing effect on the flocculation group, and it cannot be used for the suspension in the suspension system. Particles have a strong sedimentation-promoting effect; it is impossible to overcome the disadvantages of short molecular chains of inorganic flocculants, and the harm caused by the residues of polyaluminum and synthetic polymer flocculants in the flocculation process cannot be avoided; 2. During the drying process, the raw materials are not stirred, and the air flow cannot be accelerated, resulting in low drying efficiency; and it is inconvenient to install and disassemble the storage barrel, and it is inconvenient to maintain and replace it and take out materials

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