White polyaluminium chloride is a white or milky powdered powdered fine powder made of white aluminum hydroxide and high purity hydrochloric ACID. It is easy to melt in the air. In recent years, white polyaluminum chloride has replaced aluminum sulfate as a neutral sizing precipitant in paper industry.
The characteristics of white polyaluminum chloride are as follows
1、 The content of Al2O3 was 29.5%,
2、 The basicity of polyaluminium is only 50%, while that of ordinary polyaluminium is about 90%,
3、 The insoluble matter in water is only 0.3%, while that of ordinary polyaluminum is more than 2%.
4、 The solution of aluminum + is white, and the product has no clear color except pure water.
5、 It has low iron content and is easily soluble at low temperature.
The difference between white polyaluminum chloride and ordinary amount is introduced
White polyaluminium chloride is a white or milky powdered powdered fine powder produced by spray drying of aluminum hydroxide powder and high purity hydrochloric acid, which melts when exposed to air. The common polyaluminum chloride is made by natural precipitation and roller drying. Due to the high cost of white polyaluminum chloride, it is rarely used in China, and most of them are exported abroad.
Application of polyaluminum chloride:
1. It is mainly used for the treatment of domestic drinking water, industrial water supply, oilfield reinjection water, circulating cooling water and various kinds of sewage (such as urban domestic sewage, oily sewage, printing and dyeing wastewater, papermaking wastewater, steel mill sewage, etc.).
2. Paper sizing precipitant, sugar decolorizing and clarifying agent.
3. It is used in tanning, medicine, cosmetics and precision casting.
White polyaluminum chloride has replaced aluminum sulfate as neutral sizing precipitant in papermaking industry
A large number of polynuclear aluminum hydroxide complexes with positive charge and stable morphology can effectively promote flocculation and sizing.
2. The appearance is white and the iron content is very low, which can meet the needs of producing high quality paper.
Polyaluminum chloride is the pre hydrolysate of aluminum chloride, the degree of hydrolysis is relatively low, and the pH value of pulp decreases less than that of aluminum sulfate.
4 aluminum sulfate is only suitable for acid sizing, while polyaluminum chloride can be used in acid and neutral environment, which can significantly reduce the corrosion of the system and make white Water Treatment easier.
5 can be filled with cheap calcium carbonate filler, which not only reduces the production cost, improves the whiteness and folding resistance of paper, but also overcomes the unavoidable shortcomings of synthetic rubber materials (such as AKD, etc.), such as slipping and difficult to control sizing degree.
When polyaluminum chloride is used as sizing agent, the retention and drainage functions of the slurry are obviously improved.
Except for the breaking length, other indexes of the paper are improved in varying degrees.
The usage of white polyaluminum chloride is introduced
1. When using, we should first carry out a small test according to the water quality to select the best point with good water purification effect and small dosage. The solution should be prepared and used at the same time. The amount of non drinking water should be selected according to the actual situation.
2. When using solid, first add water to dissolve and prepare 10-25% solution, and then dilute the water to the required concentration. When dissolving, add water to slowly feed and continuously stir.
3. Water treatment chemicals of different manufacturers or brands shall not be mixed, and shall not be mixed with other chemicals.
4. The original solution and diluent are slightly corrosive, but lower than other inorganic flocculants.
5. Product shelf life: liquid half a year, solid two years. Solid products can still be used after moisture.
6. After reasonable dosing, the purified water quality meets the sanitary standard of drinking water.
White polyaluminum chloride applications:
1. Water treatment: domestic water, industrial water;
2. Urban Sewage Treatment;
3. The treatment of industrial wastewater, sewage and sludge, and the recovery of some residues in the sewage, etc;
4. For some industrial wastewater which is difficult to be treated, the composite PAC is prepared by mixing other chemicals with PAC as the matrix, which can obtain a surprising effect.
