Sludge from citric acid industry can be purified to be gypsum. Purification was done by calcination process at the condition 1 atm pressure and 110 °C of temperature to get calcium sulphate hernihydrat or Plester de Paris. Calcium sulphate specification that we got are grew color, hygroscopis, unsoluble in water, unflammable, and will be hard if mixed with water.
Jurnal Kimia dan Kemasan (JKK) publishes original research article related to Applied chemistry including natural product (essential oils, palm oil derivative, natural dye), biopolymer, chemical synthesis, and problems of chemical processes and apparatus; and also packaging material and ...