Environment-friendly polyaluminum chloride water purifying agent and preparation method thereof

Abstract

The invention discloses an environment-friendly polyaluminum chloride water purifying agent, which comprises the following components by weight: 30-42 parts of polyaluminum chloride, 9-15 parts of activated carbon, 13-20 parts of aluminum sulfate, 6-9 parts of ferric chloride, 8-11 parts of ferric sulfate, 4-7 parts of bentonite, 15-18 parts of a shell filter material, 1-3 parts of paracoccus aminovorans powder, and 0.9-1.5 parts of nitrobacteria powder. The purified water quality is superior to that purified by an aluminum sulfate flocculant, and the water purification cost is about 20% lowerthan that adopting aluminum sulfate flocculant; the consumption of alkalinity in the water is lower than that of various inorganic flocculants, therefore no or a small amount of alkaline agent can beapplied. And the polyaluminum chloride water purifying agent has a wide PH application range. Only two main raw materials are used in production, the raw material variety is simplified, the technological process is shortened, and the reaction is accelerated. The product is clear, the quality and performance are improved, the basicity is increased by about 10% than that of products adopting aluminum hydroxide as the raw material, and the production cost is reduced by 20% or more, and compared with products adopting bauxite as the raw material, the waste residue is reduced by 20-30%, thus beingconducive to environmental control.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to an environment-friendly polyaluminum chloride water purifying agent and a preparation method thereof. Background technique [0002] Polyaluminum chloride is commonly known as water purifying agent, also known as polyaluminum chloride, referred to as polyaluminum, and its English name is PAC. And basic polyaluminum chloride, spray-dried polyaluminum chloride belong to the same category of water purification agents. It is a cationic inorganic macromolecule flocculant with polyhydroxyl and multinuclear complexes. The appearance of the solid product is yellow or white solid powder, and its chemical formula is AL2(OH)nCL6-nm. (wherein, 1≤n≤5 , m≤10), and is easily soluble in water, has strong bridging and adsorption properties, and is accompanied by physical and chemical changes such as electrochemical, coagulation, adsorption and precipitation during the hydrolysis process, and fina...

AI Technical Summary

Problems solved by technology

It is non-toxic, but the aluminum ions contained in it are harmful to the human body. Excessive intake will lead to calcium deficiency, damage the brain, and accumulate in the liver, spleen, kidney and other parts, hindering the digestion and absorption of the human body.

[0003] The production method of polyaluminum chloride disclosed in the Chinese patent (notification number: CN101531389B, announcement date: 2012.06.27), in actual use, the advantage of the production method of polyaluminum chloride provided by the above document is that harmful substances are controlled within Standard range, cost reduction, less waste residue, the resulting product has clear color and good quality. The problem is that the production efficiency is low and the production cost can be optimized. Therefore, it is necessary to invent an environmentally friendly polyaluminum chloride water purifier and its preparation method to solve the above. question