Preparation method of flocculation water purifying agent for heavy metal

Abstract

The invention discloses a preparation method of a flocculation water purifying agent for heavy metal. The flocculation water purifying agent comprises the following raw materials in parts by weight: 30 to 45 parts of refined bentonite, 20 to 35 parts of aluminum-iron series flocculants, 5 to 12 parts of tripotassium phosphate, and 6 to 11 parts of calcium sulfate. The preparation method comprises the following steps: (1) preparing the raw materials in parts by weight percentage; (2) homogeneously mixing, and placing the refined bentonite and the aluminum-iron series flocculants in a high-speed mixing machine to be mixed, observing mixed particle size distribution under a microscope of 1000 times after a certain period of time, wherein qualification is achieved when the homogeneous mixing degree is higher than 98%; (3) putting tripotassium phosphate and calcium sulfate in a ball mill, and starting up the ball mill for 30 minutes, and then adding the materials which are homogeneously mixed in the step (2) in batches, carrying out ball milling for 60 to 90 minutes to obtain the water purifying agent. The preparation method of the flocculation water purifying agent, disclosed by the invention, has the characteristics of high yield, low cost, dense flocs, fast subsidence, low water content of sediments and good effect on removal of heavy metal in water and the like.

Description

technical field [0001] The invention relates to a preparation method of a heavy metal flocculation water purifier. Background technique [0002] With the rapid improvement of my country's industrialization of production and living standards, the annual discharge of production wastewater and domestic sewage is also increasing rapidly in series. Efficient and safe treatment of these wastewater and sewage is a challenge for the coordinated development of environmental protection and resource utilization. It is also one of the difficulties that many chemical companies urgently need to get rid of. [0003] Flocculation water purification technology is an economical, simple and efficient water treatment technology commonly used in countries all over the world. The existing flocculant products are divided into inorganic flocculants and organic flocculants according to their chemical composition; according to their usage, inorganic flocculants account for more than 80% of the market...

AI Technical Summary

Problems solved by technology

However, the disadvantage of polyaluminum chloride flocculants is that the water phase transfer of Al3+ ions has four major environmental negative effects on the human body, organisms, microorganisms, and plants. It is closely related to other diseases; there is no flocculation effect in slightly acidic water, and it will only work after adding alkali to increase the pH value; the flocs are loose, the sedimentation is slow, the sludge has high water content, and the dosage is large.