Aluminium sulfate 15.8%

Aluminium sulfate (chemical formula Al2 (SO4) 3, type of 342.15), orthorhombic system white crystalline powder, the density of 1.69 g/mL (25 ℃) [1]. As rosin gum in papermaking industry, wax emulsion glue, such as the precipitator, as a flocculant in water treatment, also can make foam extinguisher agent, in manufacturing aluminum alum, white raw material, oil decolorization, deodorization and raw material of certain drugs. Can also manufacture of artificial gems and senior ammonium alum.

About 50% of the total output of the first big USES aluminium sulfate is used in paper making, the second purpose is to in drinking water, industrial water service and industrial effluent treatment as flocculating agent, representing about 40% aluminum sulfate production. As to such after joining aluminium sulfate in water, can produce a gel, can adsorption and precipitation of bacteria, colloid and other suspended matter of aluminum hydroxide flocculus, used in water treatment can control the color and smell of water.

The main purpose

Aluminum sulfate chemical structural formula

Used as animal glue effective crosslinking agent, and can improve the viscosity of gelatin. Also used as a curing agent of urea-formaldehyde resin agent, 20% aqueous solution fast curing.

As rosin gum in papermaking industry, wax emulsion glue, such as the precipitator, as a flocculant in water treatment, also can make foam extinguisher agent, in manufacturing aluminum alum, white raw material, oil decolorization, deodorization and raw material of certain drugs. Can also manufacture of artificial gems and senior ammonium alum. Arsenic is not greater than 5 mg/kg of the product can be used for water treatment flocculant. [9]

1. Used as paper sizing agent in papermaking industry, to enhance the water resistance, seepage control performance of paper;

2. Soluble in water can make the fine particles in the water and natural colloidal particles condensed into large pieces of floc, thereby to remove from the water, therefore, used for water supply and wastewater coagulant;

3. Used as a water purifying agent, also used as a precipitating agent, fixing agent, filling agent, etc. In cosmetics used as antimicrobial khan cosmetics raw materials (astringent);

4. The fire industry, and of baking soda, foaming agent, foam extinguishing agent;

5. Analysis reagent, mordant, tanning agent, oil decoloring agent, wood preservative;

6. Albumin pasteurized stabilizer (including liquid and frozen whole eggs, protein or egg yolk);

7. As a raw material, used in the manufacture of artificial gems and senior ammonium alum, other aluminum acid salt;

8. Fuel industry, in the production of chrome yellow and lake dye as precipitation agent, solid color and filling agent role again at the same time. [14]

Leaching of the effect on aluminium sulfate modified soda saline soil study: the study moderately severe saline soil in songnen plain top guo area as the research object, by using laboratory simulation analysis, in the form of adding aluminium sulfate modified, and then to the effect of leaching are analyzed. Respectively choose aluminum sulfate added concentration was 0%, 0.2%, 0.4%, 0.6%, 0.8%, 1.0%, 1.2% were determined, the conditions are respectively studied the seven elution once, twice, three times, after the main ions in soil solution concentration and the change trend, and the concentration of the seven after adding physical properties were determined. Considering various test results, the following conclusions.

Leaching effectively improved the soil salinization degree. In the case of add a certain amount of aluminium sulfate, with the increase of number of elution, sulfuric acid root ion and chloride ion anion concentrations decreased obviously. Root and carbonate or bicarbonate have significantly lower, but the influence of the carbon dioxide in the air, falling speed is not fast sulfate and chloride ions, but also obviously improve the ion results in soil, the soil was more suitable for crop growth.

Leaching has the effect of improved soil chemical composition, but added to aluminium sulfate with leaching also has a large number of passing by, at the same time in the role of shock, etc, for the first time into the aluminum sulfate to form part of the aluminum sulfate hydrocolloids are destroyed, also affect the aluminum sulfate on soil improvement effect. At the same time, the leaching shock process also destroys the soil aggregate in the lithosphere and micro aggregate, repeatedly leaching of soil physical property doesn't improve, even have a negative effect on soil solution pH value.

When not washed out soil, the addition of aluminum sulfate, effectively improve the soil properties, especially to reduce soil alkalization degrees, effect is obvious. The soil pH, soil bulk density, soil particle size has effect on soil, and the effect is obvious. Plasma calcium magnesium with the adding of aluminum sulfate was also released, from a certain extent, also have played an important role in reducing soil salinization degree. But improved using aluminum sulfate, alone does not fully solve the problem of soil on the songnen plains. Due to the salinization of soil and higher degrees, aluminum sulfate and no effective improving soil salinization degree, even add aluminium sulfate increased levels of salts in the soil material. So that, soil types from aluminium sulphate was soda into sulfuric acid, problem was relieved, but did not fully resolved.

Integrated aluminum sulfate and leaching the pros and cons of these two kinds of improved methods, combining the two improved methods, can improve soil alkalization degrees problem, also can improve soil salinization degree, better improve the soil environment. When adding aluminium sulfate is 0.8%, washed out soil twice, the researchers pointed out that the best improvement can be obtained. [