The influence of temperature on the treatment effect of iron free aluminum sulfate water

Iron free aluminum sulfate is a white crystal that is soluble in water, insoluble in alcohol, and the aqueous solution is acidic. The dehydration temperature is 86.5. When heated to 250, the crystalline water disappears, and when heated to 300, anhydrous aluminum sulfate begins to decompose. A white crystal with a pearl luster. Mainly used as a sizing agent and flocculant for papermaking, used for drinking water, industrial water, and wastewater treatment. Its water treatment effect is influenced by various factors. This article will mainly understand the effect of temperature on water treatment efficiency of iron free aluminum sulfate.
In wastewater treatment, fine particles and natural colloidal particles in water coagulate into large flocs.
The concentration of iron free aluminum sulfate is usually 10%, and when the temperature is 0 ℃, the hydrolysis reaction rate is only 5. When the temperature is 0 ℃, the hydrolysis reaction rate can be increased by 2/3 to 1/2. Soluble in water, insoluble in pure sulfuric acid, but coexisting. The important reasons are the expansion of settling friction caused by low temperature and high viscosity water, the difficulty of settling caused by the hydrolysis reaction of suspended air pollution sources and aluminum sulfate in water, and the slow settling speed.
When the temperature is low, the potential difference of iron free aluminum sulfate air pollutants in water is large, and the repulsive force between air pollutants expands, leading to serious mutual exclusion phenomenon. Aluminum chloride in low-temperature water increases the material lag of water due to air pollutants, so it is recommended not to exceed a temperature of 5 ℃.
Iron free aluminum sulfate is used as a precipitant for rosin gum, wax lotion and other sizing materials in the paper industry, as a flocculant in water treatment, as well as an internal retention agent for foam fire extinguishers, as a raw material for manufacturing alum and aluminum white, as well as a raw material for petroleum decolorization, deodorant and some drugs. It can also manufacture artificial gemstones and ammonium alum. Products with arsenic content not exceeding 5mg/kg can be used as water treatment flocculants.
It can be used in the production of paper, fabrics, food leavening agents, white rubber, white leather, etc. At present, the annual production capacity of iron free aluminum sulfate in China is about 1500t, accounting for only 0.19/6-0.2 of the total production of aluminum sulfate.
Iron free aluminum sulfate is used as a paper sizing agent in the papermaking industry to enhance the water resistance and anti-seepage performance of paper. After being dissolved in water, it can cause small particles and natural gel particles in the water to condense into large flocs, which can be removed from the water. Therefore, it is used as a coagulant for water supply and wastewater. Used as a purifying agent for turbid water, as well as a precipitant, fixative, filler, etc. Used as a raw material for anti sweat cosmetics in cosmetics. In the fire protection industry, foam extinguishing agent is composed of baking soda and foaming agent. Analytical reagents, mordants, tanning agents, oil decolorizing agents, wood preservatives.