Brief introduction of crystalline aluminum chloride

Properties of crystalline aluminum chloride:

Molecular formula: ALCL3.6H2O,

Appearance: pale yellow or white crystal

English name: Aluminumchloridehexahydrate

Popular names: aluminum chloride hexahydrate, aluminum chloride hexahydrate, industrial aluminum chloride, crystalline aluminum chloride, etc.

According to uses: crystalline aluminum chloride for casting, crystalline aluminum chloride for water purification, crystalline aluminum chloride for additives, crystalline aluminum chloride for medicine, crystalline aluminum chloride for export, etc.

The content is 30-33%, the relative molecular weight is 24 1.43, the crystal is colorless orthorhombic system, the relative density is 2.398, the analysis temperature is 100℃, it has strong hygroscopicity and is easy to deliquesce, it is acidic when dissolved in water, ethanol, ether and aqueous solution, and slightly soluble in hydrochloric acid, and hydrogen chloride is released when heated to 65,000℃.

Crystalline aluminum chloride is a cheap and effective flocculant, which is used for drinking water, industrial water, industrial wastewater, urban sewage and swimming pool circulating water treatment. It has remarkable effects of precipitating heavy metals and sulfides, decolorizing, deodorizing, degreasing, sterilization, phosphorus removal, and reducing COD and BOD in effluent. It is easily miscible with water, and the aqueous solution is acidic, which has an oxidative corrosion effect on metals. When diluted with water, iron hydroxide precipitate will be generated after hydrolysis, which has strong cohesion and is suitable for water bodies.

Quality and technical index of crystalline alumina;

Characteristics of crystalline alumina hardener;

The advantages of using crystalline aluminum chloride as hardener are as follows:

1, the shell has high strength at room temperature and high temperature, good dimensional stability of the shell and high yield of castings.

2, no harmful gas is generated in the hardening process, and the working environment is improved.

3. The molded shell not only has high strength, basically eliminates the phenomena of breakout and misfire, but also has less sand layer and thin shell layer, thus improving the air permeability and reducing the generation of air holes.

4. The quenching process is easy to control during use, which is beneficial to reduce the rejection rate of castings and improve economic benefits.

Compared with other flocculants for wastewater treatment, Henan Fu Sheng crystalline alumina has the following advantages:

1, instead of liquid or solid flocculants such as aluminum sulfate, polyaluminum chloride and polyferric sulfate, the treatment cost is reduced by more than 30%;

2. Excellent flocculation performance, and the settling speed is higher than that of aluminum salt series flocculants (such as aluminum sulfate and polyaluminum chloride). ), and the formed alum flowers are dense;

3, the generated sludge is small, which greatly saves the sludge treatment cost;

4. The pH value of the adaptive water body ranges from 4 to 12, and the ideal pH value ranges from 6 to 10.

Hardener for casting materials-crystalline aluminum chloride;

? In investment casting, Fusheng crystalline aluminum chloride can replace ammonium chloride as the hardener of investment casting shell, which has the advantages of stable quality, high strength of shell, convenient use and adjustment, improved workers' operating conditions and good comprehensive economic benefits.

Industry standard: HG/T325 1-2002

Quality index of crystalline aluminum chloride curing agent for precision casting;

Crystalline aluminum chloride content ≥96

Iron content ≤0.025

Water insoluble matter content ≤0. 10

At present, most domestic precision casting production uses sodium silicate as binder, and usually uses ammonium chloride, magnesium chloride and aluminum chloride as hardener. However, in the process of use, ammonia will release ammonium chloride, which seriously worsens the working conditions. Magnesium chloride affects the hardening and drying speed because of the high viscosity of the solution, and the high impurity content is easy to cause defects such as shelling, peeling and sand inclusion. Therefore, ammonium chloride and magnesium chloride as hardeners are not suitable for the development of investment casting, and many manufacturers use crystalline aluminum chloride instead of ammonium chloride and magnesium chloride as hardeners.

Technological parameters of shell-making with crystalline aluminum chloride:

Concentration %:33-35

PH value: 1.4- 1.7

Density g/cm:1.17-1.19.

Alumina content %:6.5-7.0

Degree of alkalization: 1.8-7.

About 50 kg of aluminum chloride is added to the newly prepared hardening solution per kloc-0/00 kg of water, and the concentration is controlled at 33%. In order to avoid the influence of local concentration on the dissolution rate, the solution should be stirred from time to time to make it fully dissolved and mixed evenly. The content of aluminum chloride hardening solution will gradually decrease during use, while the alkalinity and PH value will increase, and the viscosity will also increase. Fu Sheng reminded everyone that it is necessary to add an appropriate amount of crystalline aluminum chloride to adjust the content of aluminum oxide in the hardening solution. When the PH value is greater than 1.7, some industrial hydrochloric acid should be added appropriately.

Crystalline aluminum chloride for water treatment;

Quality index of crystalline aluminum chloride:

Implementation standard: ZBG77000-90

Aluminum chloride content ≥97.0

Iron content ≤0.025

Water insoluble matter content ≤0.05

Arsenic content ≤0.0005

Heavy metal (calculated by lead) ≤0.002

PH value (1% aqueous solution) ≥2.5.

Application scope of crystalline aluminum chloride:

Users can determine the dosage by experiments according to their own purposes, such as hardener for formwork. The manufacturer of crystalline aluminum chloride in Fu Sheng, Gongyi, Henan suggested that users and friends make it into 30-33% AlCl3 6H2O aqueous solution, which can replace ammonium chloride in investment casting, with stable quality, high shell strength, convenient use and adjustment, improved workers' operating conditions and good comprehensive economic benefits. Mainly used as hardener for precision casting shell, and also used as wood preservative and paper sizing precipitant. It is the raw material of chlorinated cracking catalyst monomer in petroleum industry, which is used for wool refining (using carbonized plant fiber to clean), aluminum hydroxide gel production, printing and dyeing and pharmaceutical industry.