【Case】 Morocco 500tpd Silver Ore Flotation Project

2019-04-09 Xinhai Views (1991)

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Along with the expressway in Agadir Morocco to the east, into Tallouine Tarudan, several miles away, a Morocco 500 t/d silver flotation plant undertaken by Xinhai Mining is under orderly production.

Morocco 500tpd silver ore flotation project
(Morocco 500tpd silver ore flotation project)

Referring to Morocco, most people would naturally think of the Sahara, the biggest desert in the world. As one of the most ancient countries in Africa, Morocco is rich in mine resources, such as copper, iron, manganese, tungsten, molybdenum, tin, silver, gold and so on. As the development of economic globalization, more and more people in the mining industry take part in the investment on this rich land. This Morocco 500t/d silver flotation EPC service project is a shadow of China-Morocco mining development cooperation.

Use the table of contents below to navigate through the guide:

01Project Background

This silver mine is located on the Altas mountains in the mid of Morocco which is the second biggest silver mine in Morocco after Imiter and the 14th biggest silver mine in the world. In 2012, M mining company successfully purchased this silver mine, and built a 300t/d silver cyanidation plant to recover silver.

silver cyanidation plant
(The original 300t/d silver cyanidation plant)

With the increase of mining depth, M mining company found that the original 300t/d cyanidation plant couldn't meet the need of present dressing demand. The dressing equipment was lack of repairment for years and the technology flow is unreasonable which led an unreachable predicted capacity. The recovery rate of silver was decreased over the years.

Therefore M mining company decided to rebuild and reform the silver dressing plant. Through the comparison and inspection of many mineral processing companies, clients accepted the brank strength, customized mineral processing EPC service, advanced and reliable equipment quality and high-quality service of Xinhai Mining, and chose Xinhai Mining as the partner.

Contract signing ceremony
(Contract signing ceremony of Morocco 500tpd silver ore flotation project)

02Project Overview

Ore characteristic: the metallic minerals were natural silver, pyrite, limonite and so on. The gangue minerals were quartz, feldspar, clay mineral and so on. Silver was the recyclable element.

Processing capacity: 500tpd.

Technology process: Two and a half stage close-circuit crushing – two-stage grinding – flotation (a roughing, three scavenging and two cleaning) – two-stage dewatering process.

Main equipment: jaw crusher, cone crusher, circular vibrating screen, wet grid ball mill, wet overflow ball mill, high dam single spiral classifier, hydrocyclone, jig, shaking table, flotation cell, high-efficiency thickener, filter press and so on.

Morocco 500tpd silver ore flotation plant
(Morocco 500tpd silver ore flotation project)

03Xinhai Solution

During the crushing stage, Xinhai used two and a half stage close-circuit crushing process. Coarse crushing and middle crushing chose jaw crusher. Fine crushing chose cone crusher. Screen stage chose circular vibrating screen. The crushing product transported to the original fine ore bin through belt conveyor and then truck loaded to the new plant.

Crushing stage of Morocco 500tpd silver flotation plant
(Crushing stage of Morocco 500tpd silver flotation project)

Grinding stage Xinhai used two-stage closed-circuit grinding process. One stage grinding chose wet grid ball mill. The ore discharges were gravity separated by the jig. The concentrations were finely separated by shaking table. The gravity tailings were classified by high dam single spiral classifier. The second stage grinding chose wet overflow ball mill. The second stage classification chose cyclone unit. The one-stage grind fineness is 55% to 60% -200 mesh. The second-stage grind fineness is 85% to 90% -200 mesh.

Grinding and classifying process of Morocco 500tpd silver ore flotation project
(Grinding and classifying process of Morocco 500tpd silver ore flotation project)

Flotation operation adopted a roughing, three scavenging, two concentration process. The two-stage mechanical dehydration process was adopted in the concentrate dehydration operation, and the thickener was used for first stage dehydration operation and the filter press was used for the second stage dehydration. Finally, the cake contained about 20% water. The tailings were directly discharged to the original tailings pond.

Flotation process of Morocco 500tpd silver ore flotation project
(Flotation process of Morocco 500tpd silver ore flotation project)

After the concentrate was sent to the mixing system of the original plant. The mixing system was newly built on the basis of the original plant, which adopted clamshell feeding method. Through the high-concentration agitating tank for slurry mixing, the slurry was sent to the existing grinding and classifying system. After concentrated by the thickener, the cyclone overflow was sent to the existing leaching system for leaching over 60 hours. After five-stage washing operation, the pregnant solution was delivered to the zinc powder replacement device for smelting, and the tailings were pumped to the tailings pond.

Thickener of Morocco 500tpd silver ore flotation project
(Thickener of Morocco 500tpd silver ore flotation project)

04Project Advantage

1. Rational plant layout, suited to local conditions

● There are lots of bare rock in the plant site, and the price of concrete in Morocco was expensive. Therefore, Xinhai Ming adopted steel structure plant design, which not only saved the cost of infrastructure investment, but also shortened the period of civil construction.

● On the basis of the former cyanide plant, Xinhai Mining appropriately added some new equipment and processes, made the most of the existing plant, equipment and foundation. Through the scientific and reasonable plant design, Xinhai Mining ensured that the whole plant process flows smooth, the new and old equipment runs normally, and the expected recovery rate was achieved.

2. Advanced process and reliable equipment

● Xinhai Mining adopted crusher and vibrating screen to form two semi-closed circuit crushing process, which obviously reduced the particle size of crushed ore and reduced the load of grinding mill;

● In the classifying operation, Xinhai Mining especially increased the sand return automatic lifting device, which greatly saved the power;

● In the flotation operation, Xinhai Mining configured a few types of flotation machine as a flotation unit, and set the reasonable reagent system;

● The thickener, leaching workshop, purification workshop, replacement workshop and dehydration workshop was upgraded on the original basis of the original pant. Besides, the original equipment was serviced and those damaged parts were replaced totally, which fully ensured the stable operation of the later production.

3. Low investment cost, high beneficiation index

● With the mineral processing EPC+M+O service, the production cost of the project was reduced by 15%, which remained about 5% less than the expected investment cost;

● After the grinding, gravity separation and flotation operation, the recovery rate of silver was up to 83.95%.

Location map of Morocco 500tpd silver ore flotation project
(Location map of Morocco 500tpd silver ore flotation project)

05Customer Feedback

At present, Morocco 500tpd silver ore flotation project has been put into operation with stable operation, reliable equipment quality, and standard mineral processing indicators and economic benefits. The project customer gave full affirmation to Xinhai mineral processing EPC+M+O service.

map of Morocco 500tpd silver ore flotation project
(Location map of Morocco 500tpd silver ore flotation project)

Going back to the source, China and Morocco have gone through 60 years of ups and downs. New connotation and vitality are emerging from the relation between the two sides. With the "One Belt And One Road" initiative, Xinhai "mineral processing EPC+M+O service" has been successfully located in more than 100 countries and regions around the world, 500 mineral processing EPC+M+O projects, over 2000 served mines were around the world, and Xinhai also have set up multiple overseas offices in many countries.

In the future, Xinhai Mining will also strive to provide customized "mineral processing EPC+M+O service" for each customer, and work more closely with customers in Morocco and even the whole African countries, promote the development of African mining industry.



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