Pickling apparatus and pickling method
A pickling apparatus includes a plurality of pickling tanks in which a scale of a steel plate is removed while the steel plate is advanced and sequentially dipped; an intermediate spraying unit, disposed between a pickling tank at the front end and a pickling tank at the rear end, for spraying a pickling solution onto the steel plate; and a pickling solution supply means configured to provide a pickling solution of a concentration used in the pickling tank at the rear end to the intermediate spraying unit, wherein a wringer roll disposed between the plurality of pickling tanks is removed.
1. A pickling apparatus comprising;
a plurality of pickling tanks in which scale of a steel plate is removed while the steel plate is advanced and sequentially dipped;
an intermediate spraying unit disposed between a forward pickling tank and a rear pickling tank to spray a pickling solution to the steel plate; and
a pickling solution providing unit providing a pickling solution having a concentration used in the rear pickling, tank to the intermediate spraying unit,
the pickling solution providing unit includes:
a plurality of circulation tanks arranged to respectively correspond to the plurality of pickling tanks and maintaining a pickling solution level of the picking tank as the pickling solution is circulated, with the corresponding pickling tank; and
a supply line supplying the pickling solution from a rear circulation tank corresponding to the rear pickling tank to the intermediate spraying unit,
wherein a concentration of the pickling solution accommodated in the plurality of pickling tanks is increased toward the rear pickling tank,
wherein the pickling apparatus further comprises a pickling solution transfer unit transferring the pickling solution sprayed by the intermediate spraying unit to the front circulation tank corresponding to the forward pickling tank,
wherein the pickling solution transfer unit includes;
a connection chamber connecting the forward pickling tank and the rear pickling tank and including the intermediate spraying unit; and
a transfer line connected to the front circulation tank corresponding to the forward pickling tank from the connection chamber and transferring the pickling solution sprayed by the intermediate spraying unit, and
wherein a wringer roll disposed between the plurality of pickling tanks is eliminated.
2. The pickling apparatus of claim 1 , further comprising:
a pickling solution regeneration unit connected to a foremost circulation tank and a rearmost circulation tank, among the plurality of circulation tanks, regenerating the pickling solution discharged from the foremost circulation tank, and supplying the regenerated pickling solution to therearmost circulation tank, to form a circulation structure of the pickling solution,
wherein a flow rate of the pickling solution sprayed from the intermediate spraying unit is equal to or greater than a flowrate of the pickling solution supplied to the rearmost circulation tank from the pickling solution regeneration unit.
3. The pickling apparatus of claim 1 , wherein a support roll upwardly supporting the steel plate is disposed between the plurality of pickling tanks.
4. A pickling method comprising:
a scale removing operation in which a scale of a steel plate is removed while the steel plate is advanced and sequentially dipped in a plurality of pickling tanks;
an intermediate spraying operation in which the pickling solution is sprayed to the steel plate by an intermediate spraying unit between a forward pickling tank and a rear pickling tank during the scale removing operation; and
a pickling solution providing operation in which the pickling, solution having a concentration used in the rear pickling tank is provided to the intermediate spraying unit, before the intermediate spraying operation,
wherein in the pickling solution providing operation, a plurality of the circulation tanks are arranged to respectively correspond to the plurality of pickling tanks and the pickling solution is supplied to the intermediate spraying, unit from a rear circulation tank corresponding to the rear pickling tank, among the plurality of circulation tanks maintaining the pickling solution level of the pickling tank, as the pickling solution is circulated, with the corresponding pickling tank,
wherein a concentration of the pickling solution accommodated in the plurality of pickling tanks is increased toward the rear pickling tank,
wherein the pickling method further comprises a pickling solution transfer operation in which a connection chamber connecting the forward pickling tank and the rear pickling tank and including the intermediate spraying unit transfers the pickling solution sprayed by the intermediate spraying unit to the front circulation tank corresponding to the forward pickling tank, and
wherein a wringer roll disposed between the plurality of pickling tanks is eliminated.
5. The pickling method of claim 4 , further comprising:
a pickling solution circulating operation in which the pickling solution discharged from the foremost circulation tank is regenerated by a pickling solution regeneration unit connected to the foremost circulation tank and therearmost circulation tank, among the plurality of the circulation tanks, and introduced to the rearmost circulation tank,
wherein a flow rate of the pickling solution sprayed by the intermediate spraying unit is equal to or greater than a flow rate of the pickling solution introduced to therearmost circulation tank from the pickling solution regeneration unit.