Morocco 500TPD Silver Processing Plant

01Project Overview

With the continuous increase of mining depth, M Mining Company found that the original 300t/d silver mine cyanidation plant has gradually been unable to meet the current mineral processing needs. The processing capacity cannot reach the expected design due to the long-term disrepair of the dressing equipment and the unreasonable technological process, and the silver recovery rate is decreasing year by year. Therefore, M Mining Company decided to make a transformation.
The metal minerals of the project are natural silver, pyrite, limonite, etc.; the gangue minerals are quartz, feldspar, clay minerals, etc. The element available for recycling is silver.

02Xinhai Solution

Crushing stage: Two-stage semi-closed-circuit crushing process is adopted. Jaw crusher is used for coarse crushing and medium crushing; cone crusher is used for fine crushing, and circular vibrating screen is used for screening. The crushed ore products are transported by belt conveyors to the original powder ore silo, and then loaded and transported to the proposed new plant site;
Grinding stage: Two-stage closed-circuit grinding process is adopted. Wet grid type ball mill is used for the first-stage grinding. Jig is used for gravity separation for discharge ore, and shaking table is used for concentrate enrichment, and high-weir type single-spiral classifier is used for classification of gravity separation tailing. Wet overflow ball mill is used for second-stage grinding  and hydrocyclone units are used for the second-stage classification. The grinding fineness of the first stage is -200 mesh, accounting for 55-60%; the grinding fineness of the second stage is -200 mesh, accounting for 85-90%;
Flotation stage: one roughing-three sweeping-two concentrating process is adopted. The concentrate de-watering operation adopts a two-stage mechanical de-watering process. A thickener is used for the first-stage dehydration, and a filter press is used for the second-stage dehydration. The filter cake contains about 20% water. The tailing are directly discharged to the original tailing pond, and the backwater is recycled;
Slurry mixing stage: The pulping system is newly built in the original dressing plant, using the method of grabbing the ore, mixing the slurry through a high-concentration agitation tank, and using the existing grinding and classifying system for operation. After being concentrated by the thickener, the overflow of hydrocyclone is sent to the existing leaching system. The leaching time is more than 60h, and then it goes through a five-stage washing. The pregnant liquid is replaced by zinc powder for smelting. After the tailing is treated, they are pumped to the tailing pond.

03Project results

The whole set of dressing plant services has reduced the production cost by 15% compared with original plant. It is also 5% lower than the customer's expected investment cost control. After gravity separation and flotation operations, the silver recovery rate is as high as 83.95%. The whole plant is running stably, the equipment quality is reliable, and the beneficiation indicators and economic benefits have reached expectations. Our mineral processing EPC solution has been strongly affirmed and recognized by the project customers.