As a professional mineral processing equipment and service provider, Xinhai has always been committed to providing customers with the turnkey solution for mineral processing plant, including mine design, mineral processing research, complete equipment manufacturing and procurement, commissioning and delivery. In the past 20 years, Xinhai has successfully completed hundreds of mineral processing EPC plants by relying on its accurate technical support and perfect service, and received consistent praise from customers. The following lead-zinc ore processing plant in Chamdo, Tibet was a successful case of Xinhai mineral processing EPC service.
The design scale of this project was 600,000 tons/year (2,400 tons per day), and the working days were 250 days. The plant was constructed in two phases. The first phase of construction was 300,000 tons/year (1200 tons per day), and the second phase of construction was 300,000 tons/year (1200 tons per day).
The project adopted flotation process, and the main products were lead antimony concentrate and zinc concentrate. The design indexes were as follows:
Productivity: Lead concentrate: 10.9%; Antimony concentrate: 10.9%; Zinc concentrate: 2.58%;
Concentrate grade: Lead concentrate: 32.17%; Antimony concentrate: 28.11 %; Zinc concentrate: 59.9%;
Recovery rate: Lead concentrate: 85.11 %; Antimony concentrate: 82.59 %; Zinc concentrate: 88.82 %.
Xinhai Mine Design Institution made a perfect mineral processing flowsheet plan for this project.
The crushing stage adopted three stage one closed circuit process. The feed size was 500mm and product granularity was - 12mm. The crushing equipment adopted advanced crusher with efficient and energy saving performance, which accorded with the principle of more crushing less grinding.
The grinding and classifying stages adopted primary grinding and classifying process, and the -200 mesh grinding fineness was up to 61%. The classifying process adopted advanced pump and cyclone process instead of traditional spiral classifier process. So, Xinhai used bearing driven energy saving grid ball mill and international leading Linare pump and Linare cyclone. This process was featured with high classifying efficiency, large processing capacity, and low energy consumption, less civil investment and convenient maintenance & management. The larger classification overflow density (weight concentration > 45%) was beneficial to separating operation.
Flotation stage adopted "lead, antimony differential flotation-zinc sulfide bulk flotation separation" process. According to the actual production experience of similar mine, concentration times and zinc scavenging times were added one more time than test times. Besides, both lead antimony differential flotation and zinc sulfide bulk flotation separation used one roughing, two scavenging and three concentrating process.
In addition, dewatering stage adopted two stages mechanical dewatering, the first stage used high efficient improved thickener, and the second stage adopted ceramic filter. Finally, the concentrate moisture was less than 9%.
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