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What are the similarities and differences between polyaluminum chloride and crystalline aluminum chl

Author:小编 Date:2021-01-29 17:31:31 Hits:

What is the difference between polyaluminum chloride and crystalline aluminum chloride?


Polyaluminum chloride and crystalline aluminum chloride have different effects, let's have an in-depth understanding of:


Product description of polyaluminium chloride and crystalline aluminium chloride


1. Polyaluminium chloride


Polyaluminum chloride: PAC for short, usually also known as basic aluminum chloride or flocculant, is an inorganic polymer coagulant.


It is a kind of water-soluble inorganic polymer between AlCl3 and Al (OH)3. The chemical formula is [Al2 (OH) NCl6-NLM], where M represents the degree of polymerization and N represents the degree of neutrality of PAC product.


Due to the bridging action of hydroxide ions and the polymerization of polyvalent anions, inorganic polymer water treatment agents with higher molecular weight and higher charge are produced.


Polyaluminium chloride (PAC) is polymerized and does not contain crystal water. Its molecular formula is abbreviated as Al2Cl(OH)5. Color is reddish-brown or light yellow solid


2. Crystalline aluminum chloride


Crystalline aluminum chloride is the crystalline state of aluminum chloride, the molecular formula is AlCl3.6H2O, usually with 6 crystal water.


Divide by name: aluminum chloride hexahydrate, aluminum chloride hexahydrate, industrial aluminum chloride, crystal aluminum chloride, etc. By use: aluminum chloride for casting, aluminum chloride for water purification, aluminum chloride for additives

What are the similarities and differences between polyaluminum chloride and crystalline aluminum chl(图1)

Two, polyaluminum chloride, crystalline aluminum chloride products product advantages


1. Polyaluminium chloride


The advantages of PAC are,


1) It has strong bridging and adsorption performance. In the process of hydrolysis, multi-hydroxyl condensation, adsorption and precipitation are accompanied by physical and chemical processes. 2) The fundamental difference between the traditional inorganic coagulant and the traditional inorganic coagulant is that the traditional inorganic coagulant is a low molecular crystalline salt, while the structure of polyaluminum chloride is composed of complex complexes with variable morphology. 3) Fast flocculation sedimentation speed and wide range of applicable pH values. 4) Non-corrosive to pipeline equipment. 5) The water purification effect is obvious, which can effectively remove SS, COD, BOD, arsenic, mercury and other heavy metal ions in the water.


2. Crystalline aluminum chloride


The advantages of crystalline aluminum chloride are,


1) The shell has high strength at normal temperature and high temperature, good dimensional stability of the shell and high casting yield; 2) made of shell not only high strength, prevent steel leakage running fire, less sand layer number, thin shell layer, increase air permeability, reduce the generation of pores; 3) The cost is greatly saved due to the reduction of consumption in the use process and the hardening process is easy to control, which is conducive to reducing the casting reject rate and increasing the economic efficiency; 4) In the hardening process does not produce harmful gas, not easy to corrode the equipment, improve the working conditions.


Three, polyaluminum chloride, crystalline aluminum chloride products product application


1. Polyaluminium chloride


1) Widely used in the field of drinking water, industrial water and sewage treatment. 2) can be sterilized, deodorized, fluorine, aluminum, chromium, in addition to oil, turbidity, in addition to heavy metal salt, in addition to radioactive pollutants, in the process of purifying all kinds of water has a wide range of uses. 3) chemical industry water, industrial waste water, mining, oil field back injection water, purification water, gold, coal washing, leather and all kinds of chemical sewage treatment. 4) Industrial production and application; Paper making sizing, printing and dyeing bleaching, cement accelerator, precision casting hardener, refractory adhesive, glycerine refining, cloth wrinkle prevention, medicine, cosmetics and other industries, waste water can be recycled. 5) in the smelting industry, for water separation, the effect is very good. 6) Purify drinking water and sewage.


2. Crystalline aluminum chloride


1) Treatment of drinking water, water containing high fluoride and industrial water, and purification of oily sewage. 2) The treatment effect of low temperature, low turbidity and alkaline water is better. 3) Production of intermediate products of polyaluminum chloride (instead of hydrochloric acid, reduce pollution). 4) It is widely used in printing and dyeing, medicine, leather, oil field, paper making, precision casting and so on. 5) Crystalline aluminum chloride can be used as hardener for investment casting shell instead of ammonium chloride in precision casting.



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