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Aluminum Sulfate

A study on the coagulation properties of aluminum sulfate was published in 1885, that states that aluminum sulfate, as a coagulant, has been extensively used in large quantities because of its excellent coagulating property and marketability. Samwoo Co., Ltd. manufactures high-purity aluminum sulfate by directly reacting high-quality aluminum hydroxide, which is the main raw material containing almost zero impurities, with sulfuric acid.

Manufacturing Methode

Manufacturing Methode

Since 1985, our company has been producing aluminum sulfate and selling it to meet a wide range of demands on different levels. We have adapted well to changes in demand in recent years and to the elevation of quality standards through technological innovation. Due to our consistent quality management effort, we have acquired a KS M1411 certification and are now producing a most reliable product. By market demand, our company is now shifting from producing solid aluminum, sulfate to liquid aluminum sulfate. We are thus extending our manufacturing equipment for liquid aluminium sulfate, even as we are manufacturing products with different particle size.

  • Water purifier : national water supply, industrial water supply, industrial waste water, metropolitan sewage
  • Die production
  • Figment production
  • Precipitant for ceramic materials
  • Pharmaceutical production
  • As a raw material for various aluminum compounds

Quality and Standard

Changes in Raw Materials

KS M 1411 stipulate quality specification of aluminum sulfate as follows, General industry and tap water specification as follows.

Industry
Industry
item Industry 3rd grade
KS M1411-1987 Our Spec.
Appearance - -
pH(2W/V%) 3.0 or more 3.0 or more
Water insoluble solids(%) - -
Al₂O₃(%) 8.0 or more 7.0~8.2
(Fe)(%) 0.02 or below 0.02 or below
Tap Water(Liquid)
Tap Water(Liquid)
Item Tap water
KS M-1987) Our Spec.
Appearance - -
pH(2W/V%) 3.0 or more 3.0 or more
Water insoluble solids(%) - -
Al₂O₃(%) 8.0 or more 8.0 or more
(Fe)(%) 0.02 or below 0.02 or below
Ammonia nitrogen(%) 0.01 or below 0.01 or below
(As)(%) 10.0 or below 10.0 or below
(Mn)(%) 25.0 or below 25.0 or below
(Cd)(%) 2.0 or below 2.0 or below
(Pb)(%) 10.0 or below 10.0 or below
(Hg)(%) 0.2 or below 0.2 or below
(Cr)(%) 10.0 or below 10.0 or below

Physicochemical Characteristics

Distinctive
  • Relationship with Specific Gravity, Temperature and Concentration

    The genuine specific gravity of solid aluminum sulfate is about 1.62, but its temporary specific gravity is 0.6~0.7. the graph below shows the relationship among the specific gravity, the temperature and the concentration(%) of liquid aluminum sulfate. The chart will determine the sulfate's concentration(%).

    액체황산알루미늄의 온도비중관계도
  • Mucosity

    Refer to the chart for the relationship between the concentration and the mucosity of aluminium sulfate.

    액체황산알루미늄의 온도, 점도의 관계
  • pH

    Refer to the chart for the relationship between the valid ingredient of the neutral salt/acid solution and the pH [at 20 ℃] of the liquid aluminum sulfate sample : A- when it is neutral salt, B- when its basicity is 0.025%.

    액체황산알루미늄의 PH(20℃)
  • Crystallization Temperature

    The crystallization temperature of liquid aluminium sulfate is lowest[about -14 C] when its concentration is less than 8%. Its crystallization temperature rises dramatically, however, when its concentration is greater than 8.2%, and it finally closes pipes/devices in concentration. Therefore, the concentration of the product in the market is either 7.0% or 8.0%.

    액체황산알루미늄의 결정석출 그래프
  • Chemical Characteristics

    The composition of aluminium sulfate can be expressed, and solid alu\-minium sulfate is expressed, as Al₂(SO₄).nH₂O due to the crystallization of water molecules. In Korea, products with 14-16 molecules are generally manufactured.

    These are colorless crystals that are soluble in water but in soluble in alcohol. The hydro soluble liquid extracts the precipitation of hydroxy aluminium, which is acidic. If the solution is boiled for a long period of time, basic aluminium sulfate forms.

    Al₂(SO₄)3·nH₂O → Al₂(SO₄)₃ 3· nH₂O → Al₂(O)3· 3SO₃

    액체황산알루미늄의 화학적 성질

JAR Test Method

JAR Test Method

After Putting the 500ml testing solution in the 500ml beaker, add the reagent continuously using the mess pipette while Stirring at 100~120 rpm. Rapid stirring for 1~2minutes is continued for dispersion.

Continue slow stirring at 50~60rpm for 10minutes for FLOC growth, and stop stirring for 5~6 minutes.

  • Adjustment of the Turbidity, pH and Alkalinity of the Original solution before its addition. ② Stirring – The condition mentioned above is standard.
  • Stirring :

    The condition mentioned above is standard.

  • If an organic macromolecular agglutinating agent is used together with the reagent :

    the reagent is added first and stirred for 10~60 seconds. Then the organic macromolecular agglutinating agent is added and the mixture is stirred slowly but continuously.

  • Adjustment of the Aluminum Sulfate Solution for the Selt-test.
The Table below shows the amount of agglutinating agent that should be added to the diluting solutions
The Table below shows the amount of agglutinating agent that should be added to the diluting solutions
ppm 500cc(ml) 100cc(ml) 1m³(ml)
1% sol 10% sol 1% sol 10% sol 1% sol 10% sol
1 0.05 0.005 0.1 0.1 10 1
2 0.10 0.01 0.2 0.2 20 2
3 0.15 0.015 0.3 0.3 30 3
4 0.20 0.02 0.4 0.4 40 4
5 0.25 0.025 0.5 0.5 50 5
6 0.30 0.03 0.6 0.6 60 6
7 0.35 0.035 0.7 0.7 70 7
8 0.40 0.04 0.8 0.8 80 8
9 0.45 0.045 0.9 0.9 90 9
10 0.50 0.05 1.0 0.1 100 10
20 1.0 0.1 2.0 0.2 200 20
30 1.5 0.15 3.0 0.3 300 30
40 2.0 0.2 4.0 0.4 400 40
50 2.5 0.25 5.0 0.5 500 50
60 3.0 0.3 6.0 0.6 600 60
70 3.5 0.35 7.0 0.7 700 70
80 4.0 0.4 8.0 0.8 800 80
90 4.5 0.45 9.0 0.9 900 90
100 5.0 0.5 10.0 1.0 1000 100

Instructions for Storage

Instructions for Storage

The inside of the container should be resistant to corrosion using a rubber lining, FRP, an epoxy resin or polyethylene. In case of leakage, neutralize thoroughly with slaked lime, baking soda and calcium carbonate.

  • Handling Precautions

    Wash the substance off immediately if it stains clothing. Otherwise, the clothing will be damaged. Wash the substance off completely if it comes in contact with tour skin. If you leave it as it is for a long period of time, it will roughen your skin. Wash it off immediately if it comes in contact with your eye. If the situation is serious, consult your eye specialist. Wearing a safety glass is a very good idea.

  • Storage of Aluminum sulfate in winter

    Aluminum sulfate can freeze in winter due to the evaporation phenomenon on the inside wall of the tank. As the liquid temperature goes down, the nuclei of Al₂(SO₄)₃․28H₂O goes up and begins to close the pipe laying. Therefore, keep in mind the following facts goes up and begins to close the pipe laying. Therefore, keep in mind the following facts.

  • Insulation

    Keep the pipe laying, the valve, the pump and the small tank warm. (Be especially careful with parts exposed to outside elements. If possible, keep them warm using a steamer/heater.)

  • Dilution

    Check the specific gravity of the aluminum sulfate at around November, and dilute it under 1.327/20 if it is above 1.327/20.

  • Insertion of Low-concentration Products

    In cold areas, freezing can occur if the pipe laying is the pipe laying is thin or distant, due to the slow flow rate. In this case, the insertion of a low-concentration product could be helpful. Give us a call if the substance still freezes after the above instructions are performed.

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