Preparation of high-purity metals by alkali leaching of waste CRTs and other hazardous wastes containing lead and zinc | Shanghai second Polytechnic University

Preparation of high-purity metals by alkali leaching of waste CRTs and other hazardous wastes containing lead and zinc

Alkali leaching electrolysis produces high-purity zinc and lead powder, which can be used to treat zinc and lead waste residue and lead-containing glass, which is clean and low-cost.

Type

Process

Tags

Environmental & resource tech

Hazardous waste disposal

Preparation of high-purity metals

Lead and zinc hazardous waste

Waste crt

Solution maturity

Early adoption / Process verification

Cooperation methods

Overall transfer

Technology licensing

Applicable industry

Scientific research and technology services

Applications

Resource recovery

Key innovations

A new type of alkaline leaching and electrolytic hydrometallurgy of zinc and lead can directly produce high-purity powder. Overcoming the shortcomings of traditional fire/acid methods, having simple process, high recovery, low energy consumption, and little pollution, realizing the recovery of lead glass at room temperature, is a clean and efficient green metallurgical innovation.

Potential economic benefits

This technology significantly reduces production expenses by simplifying processes and reducing energy consumption, acid consumption and pollution treatment costs. High metal recovery rates and direct production of high-purity products can greatly improve economic benefits.

Potential climate benefits

This technology significantly reduces energy consumption and related carbon emissions in the production process by simplifying processes, reducing energy consumption, avoiding high temperatures, vacuum and large amounts of acid consumption. Solution recycling reduces the carbon footprint of new reagent production. Leached residue is used to prepare foam glass to replace traditional materials and further reduce carbon emissions from building materials production.

Solution supplier

Shanghai second Polytechnic University

Shanghai Second Polytechnic University focuses on industrial applications, cultivates senior specialized talents with strong practical abilities, and helps industrial upgrading.

Shanghai，China

Solution details

Introduction to the results:

The alkali leaching and electrolysis process for producing zinc and lead powder is a new wet zinc smelting process. The electrolytic precipitate is powdered metallic zinc or lead, which can directly produce high-purity zinc and lead powder. Compared with traditional fire and acid processes, this new process has the advantages of simple process, high metal recovery, strong raw material adaptability, low energy consumption, and low pollution. It has broad application prospects in the treatment of zinc oxide ores and zinc-lead-containing waste residue. The produced metallic zinc and lead powder can meet the national first and second levels of zinc and lead powder standards.

Technical advantages:

1. This technology overcomes the problems of complex impurity removal process, large acid consumption, and serious secondary pollution in the traditional acid leaching process. The alkali leaching process has strong leaching selectivity and low requirements on impurities, and can directly obtain high-purity zinc and lead powder. The solution can be recycled;

2. Overcoming the problem that lead-containing glass is basically insoluble in alkali solution at room temperature and pressure, high-purity metallic lead can be directly electrodeposited from the leaching solution after leaching. The closed-loop circulation of the solution realizes the direct wet smelting and recovery of metallic lead in lead-containing glass at room temperature and pressure, without requiring harsh conditions such as high temperature, vacuum or highly corrosive acid solutions;

3. This process can process all kinds of zinc-lead dust and lead-containing waste glass. The leaching residue can be treated as general solid waste. The lead-containing glass leaching residue can be used to prepare foam glass, which belongs to a clean production process. Application prospects: For zinc-lead-containing dust, it has been industrially operated; for CRT lead-containing glass, small and pilot tests have been completed, and industrial scale-up tests are planned.

Last updated

12:11:42, Nov 04, 2025

Information contributed by

Green Technology Bank

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