Hydrochloric Acid Recycling System “HARU”

Efficient Hydrochloric Acid Recycling System for Pickling Lines

In modern hot-dip galvanizing and steel surface-treatment plants, spent hydrochloric acid from the pickling stage represents both an environmental burden and a significant recurring cost. The ANI Metal Hydrochloric Acid Recycling System recovers and purifies used acid on-site—transforming waste into reusable pickling solution while minimizing hazardous discharge and chemical procurement expenses.

Why Acid Recycling Is Critical

Every time steel parts exit the pickling bath, spent acid carries dissolved iron salts, trace sulfates, and metal fines. Without treatment, this “spent pickle liquor” must be neutralized, treated off-site, or discharged under strict permits—costing time and money. By contrast, an on-site acid regeneration unit:

• Maintains consistent acid concentration, ensuring uniform steel cleaning

• Reduces fresh acid purchases by up to 70 %

• Cuts wastewater treatment fees and environmental liabilities

• Supports ISO 14001 and local discharge regulations

Key Features of the ANI Metal System

• Multi-Stage Evaporation & Condensation
  Vacuum-driven evaporators concentrate the spent acid and separate water vapor. Condensed water returns to rinse tanks, while purified acid is recirculated back into your pickling bath.

• Iron Chloride Precipitation Reactor
  Integrated dosing of lime or caustic soda precipitates iron as ferric hydroxide—producing a filterable sludge and restoring acid strength without over-dilution.

• Automated Process Control
  PLC-based monitoring tracks acid strength (°Be), temperature, and feed rates—automatically adjusting process parameters for consistent regeneration.

• Compact, Skid-Mounted Design
  Prefabricated modules fit into existing plant layouts, enabling quick installation with minimal civil works. Modular skids allow capacity expansion as your throughput grows.

• Safety & Emissions Management
  Closed-loop vapor recovery and scrubber integration capture acid mists, protecting operators and preventing fugitive emissions.

Operational Benefits

• Lower Operating Costs: Recapture up to 80 % of spent acid, dramatically reducing fresh-acid expenditure.

• Enhanced Pickling Quality: Stable acid concentration delivers uniform mill-scale removal and consistent surface preparation.

• Environmental Compliance: Minimize effluent volume and hazardous waste generation, cutting treatment and disposal fees.

• Improved Plant Uptime: Automated regeneration cycles run continuously, eliminating downtime for manual acid replacement.

• Resource Recovery: Recovered water and iron sludge by-products can be reused or sold, creating additional value streams.

Maintenance & Best Practices

• Daily Parameter Checks: Verify °Be readings and evaporation temperature to ensure optimal regeneration efficiency.

• Weekly Sludge Removal: Empty and dewater filter cake to prevent buildup and maintain reactor throughput.

• Monthly Heat-Exchanger Cleaning: Descale evaporator coils to maintain heat-transfer rates and energy efficiency.

• Quarterly Control Calibration: Test sensors and dosing pumps for accuracy, ensuring consistent acid strength.

Return on Investment

Most galvanizing plants recoup their ANI Metal Hydrochloric Acid Recycling System investment within 9–12 months through:

• 60–70 % reduction in fresh acid purchases

• Lower wastewater-treatment and disposal fees

• Decreased environmental-compliance costs

Elevate your pickling line’s economics and environmental performance with an ANI Metal Hydrochloric Acid Recycling System. Contact us today for a tailored feasibility study and quote!

Hydrochloric Acid Recycling System | ANI METAL

Hydrochloric Acid Recycling System | ANI METAL