"There is no mine in the world, and each mine should choose its own process plan and equipment configuration."Shandong Xinhai mining equipment adheres to open-minded thinking for each mine, tailoring appropriate processes and equipment to create ideal mine benefits.
At present, with the depletion of high-grade gold ore reserves, it is undoubtedly the mainstream trend of global gold ore dressing to study the low-grade and refractory gold ore and strengthen the traditional gold dressing process. In this regard, Xinhai mining equipment Co., Ltd. has long been committed to the R & D and innovation of gold ore dressing process, technology and equipment. At present, there are 28 innovative ore dressing processes in gold ore dressing alone.
Next, let's learn about some innovations of Xinhai mining equipment.
Xinhai mine has carried out a detailed ore washability test for it.
The Xinhai ore package is sorted according to the mineral distribution characteristics, specific gravity difference, particle size, rich and poor, and the stage of separation difficulty, which improves the comprehensive recovery rate of the target mineral;
Xinhai mining equipment digests and absorbs the innovation of advanced level at home and abroad, improves the processing capacity and effect of single equipment, and greatly reduces the area occupied by the equipment.
According to the basic principle of "early collection and early collection", Xinhai mining equipment adopts jigging machine + shaking table for coarse-grained gold and spiral chute (or centrifugal concentrator) + shaking table for fine-grained gold according to the screening and analysis results of raw ore, and basically all recoverable granular gold has been recovered before the second stage grinding;
Adhering to the principle of "more crushing and less grinding", Xinhai mine adopts high-efficiency crushing equipment (cone crusher, high-pressure roller mill, etc.) to reduce the particle size of crushed products as much as possible, and sets a pre grinding screen before the first stage of grinding, so that the qualified particle products can directly enter the gravity separation, reducing the grinding load and avoiding the harm caused by over grinding to the gravity separation of coarse gold. At the same time, the hydrocyclone is installed in front of the second stage grinding of Xinhai mine to ensure the timely separation of qualified particle grades and the early entry into the separation operation.
Single gravity separation method
Up to now, Xinhai mining equipment has completed several gold ore dressing plant projects in Africa. The ore properties are similar, and they are all laterite type gold deposits. The surface ore body is severely weathered and basically does not need to be broken. If the conventional mixing tank is used for slurry making, the impeller will be severely worn. In this regard, Xinhai mining equipment adopts a smaller size mill equipment, adds a smaller proportion of steel balls, and performs rough grinding and slurry making to avoid over grinding;
In terms of gravity separation, the Xinhai ore is purposely separated by particle size. For coarse-grained gold, jigging + shaking table separation is adopted, and for fine-grained gold, Nielsen centrifugal concentrator + shaking table separation is adopted;
In order to improve the comprehensive recovery rate, Xinhai mine adopts Nielsen and felt chute to further scavenge the shaker concentrate to improve the gold recovery rate.
Primary grinding
Xinhai mining equipment insists on timely flotation of high concentration and coarse particle size, and early recovery of target minerals to improve the recovery rate of valuable minerals.
Xinhai ore dressing plant reduces the number of unnecessary grinding sections to reduce the operating cost and increase the profit of the concentrator.
Xinhai mine adopts a new structure.
Two stage grinding
On the basis of the above advantages of flash flotation, Xinhai mining equipment adheres to the principle of "early recovery and early recovery", adding flash flotation unit after the first stage grinding, and the high-grade gold concentrate of flash flotation is directly used as a product and merged with the flotation gold concentrate after the second stage grinding;
The innovative flash flotation process of Xinhai mine reduces the secondary grinding load, and at the same time, prevents the gold from entering the secondary grinding to cause over grinding and loss.
For refractory ores, Xinhai ore pack generally adopts ultra-fine grinding + multi-stage separation to improve the recovery rate. Xinhai ore charge adopts fine grinding and flotation, and the primary cleaning medium ore and primary scavenging concentrate are combined to carry out the high-grade "medium ore regrinding and re concentration" process. In this way, it is not necessary to grind all ores to - 325 mesh, and most of the concentrate can be recovered at - 200 mesh. The particles with finer embedded particle size are reground and reselected in the high-grade medium ore, which greatly reduces the regrinding cost of the concentrator and improves the comprehensive recovery rate.
