To achieve waste acid plant priority, three process keys must be overcome. One is to ensure the quality of the regenerated acid, that is, it must be ensured that the content of regenerated acid Fe is less than 50 g/L, H.SO. content in the About 20%, so as to complete the pickling workshop pickling steel pipe process requirements; Second, to ensure that the attached product FeSo. Improve, in order to expand the market sales channels; Third, to ensure that the pickling workshop and waste acid treatment water balance. Any of the three difficulties are not resolved, will make the whole system into a failure.
Ltd. is a steel pipe manufacturer with an annual output of 300,000 tons, our company will be the evaporation of the original waste acid treatment facility. The concentration process is transformed into a new process of freeze crystallization, the new process is based on the principle that the FeSo. in the waste acid in the high acidity and low sulfuric acidity of FeSo. As the solubility of Feso decreases with temperature, the Feso in the waste acid is separated and anhydrous Feso, Feso, and Feso are produced. The waste acid from the pickling tank is transported through the ABS pipeline to the waste acid storage tank. The waste acid from the pickling tank is transported to the waste acid storage tank through the ABS pipeline by the acid pump, and the impurities are removed by precipitation. Pump the acid to the acid mixing tank with an acid pump, add fresh acid and mix the acid to a concentration of about 20%, then pump the acid to the cooling crystallization tank for mixing. When the crystals are mature, they will be transported to the centrifuge for solid-liquid separation, and the separated FeSO4 particles will be packed and sold. The acid wash flows into a regenerative acid tank for production recycling.