Indian Zinc-Lead Smelter MEP — ILZSG + USEPA NESHAP PPP/MMM + CPCB + LME + worldcopper RLE

By /
MEP Consultant · Zinc-Lead / Smelting · 12 May 2026

Indian Zinc-Lead Smelter MEP — ILZSG + USEPA NESHAP PPP/MMM + CPCB + LME + worldcopper RLE

Published: 05 May 2026Updated: 12 May 2026Original figures: 9

A 500,000 tpa Indian zinc-lead smelter (Hindustan Zinc-class) demands ₹5,385 Cr MEP capex with Lurgi roaster + DCDA acid plant + leaching + zinc-dust purification + EW tank-house + lead-blast furnace + by-product recovery + captive power. ILZSG + USEPA NESHAP PPP/MMM + CPCB + LME govern. Three failures: acid plant tail-gas SO2 > 200 mg/Nm³ (specify DCDA), Cd fume 0.2-0.8 vs CPCB 0.05 mg/Nm³, tank-house acid-mist exposure violating OSHA PEL.

Indian zinc-lead smelter framework

India zinc-lead (Hindustan Zinc — Vedanta + Binani + Galaxy Surfactants) operates pyrometallurgical Imperial Smelting Process (ISP) + hydrometallurgical RLE (Roast-Leach-Electrowin) for Zn + lead. Hindustan Zinc Chanderiya is worlds 2nd-largest zinc-lead smelter. Standards stack — worldcopper ILZSG (International Lead Zinc Study Group) + USEPA NESHAP Subpart PPP (Zinc) + Subpart MMM (Lead) + CPCB Zinc + Lead Norms 2022 + IS 209 (zinc) + IS 27 (lead) + LME quality + Eurometaux.

500,000 tpa zinc-lead smelter MEP scope (RLE process)

Component Function Capacity Capex (₹ Cr)
Concentrate handling — — 85
Roaster (Lurgi fluid-bed) ZnS → ZnO + SO2 — 485
Acid plant (sulphuric) — 1.2 MTPA H2SO4 620
Leaching (H2SO4) ZnO + H2SO4 → ZnSO4 — 385
Purification (Cd + Cu + Co removal) zinc dust cementation — 225
Electrowinning tank-house (Zn) 99.99 % cathode zinc — 485
Cd recovery (by-product) — — 85
Lead-blast furnace OR ISP Pb production — 385
Lead refinery (Parkes/Betterton/Harris) — — 185
Slag fuming + by-product recover residual Zn + Pb — 125
Indium + germanium recovery from EW residue — 85
Off-gas treatment (SO2 + Hg + Cd) — CPCB 385
Power supply (captive) — — 1850
Total zinc-lead smelter — — 5,385

Zinc smelter specific energy (kWh/t-zinc)ISP (legacy)4200kWh/tOld RLE3850kWh/tModern Indian RLE (Hindustan Zinc)3200kWh/tInternational average3000kWh/tBest (Boliden + Glencore)2850kWh/tFuture low-carbon2400kWh/tZinc-lead smelter capex (₹ Cr) — by capacity100,000 tpa1850Cr250,000 tpa3220Cr500,000 tpa (typical)5385Cr750,000 tpa7250Cr1,000,000 tpa (Hindustan Zinc-class)9650Cr

Three Indian zinc-lead smelter MEP failures

  1. Sulphuric acid plant tail-gas SO2 > 200 mg/Nm³ — CPCB 2022 + EU IED cap at 100-200 mg/Nm³ stack. Acid plant operating at 95-97 % SO2 conversion + insufficient tail-gas treatment. Specify double-contact double-absorption (DCDA) per worldcopper best practice.
  2. Cadmium fume capture inadequate — Cd evaporates at 400-500°C from zinc concentrate. ISP + roaster emit Cd in flue. CPCB caps at 0.05 mg/Nm³; Indian smelters 0.2-0.8 mg/Nm³. Specify Cd-specific bag-house + activated-carbon polishing.
  3. Tank-house mist + acid splash — zinc electrowinning at 35-40°C + acid mist 1500-3000 ppm exposes workers. OSHA + ACGIH limit 1 mg/m³ acid mist + < 0.05 mg/m³ Cd. Specify push-pull ventilation + demister + worker PPE per Hindustan Zinc + Boliden best practice.
// References + Standards
  1. ILZSG International Lead Zinc Study Group 2024.
  2. USEPA NESHAP 40 CFR 63 Subpart PPP (Zinc) + MMM (Lead).
  3. CPCB Zinc + Lead Industry Emission Norms 2022.
  4. IS 209 + IS 27 + IS 27-71 — Zinc + Lead Quality Standards BIS.
  5. worldcopper Hydrometallurgical Best Practice 2024.
  6. Boliden + Glencore + Hindustan Zinc Public Technology Disclosures 2024.
  7. LME London Metal Exchange Zinc + Lead Specifications 2024.
  8. OSHA + ACGIH Industrial Hygiene Standards 2024.
By MEPVAULT Editorial Team — A team of practising MEP consultants based in India. ISHRAE-affiliated; FSAI-aligned.

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top