Granulation (granulation) - diafiltration cyanide heap leaching

The fine ore in the ore is extremely detrimental to heap leaching. When the pile is piled up, the grain size will be deflected. When the infiltration is carried out, the powder ore moves with the liquid flow, which is easy to cause channeling, so that the leaching agent cannot uniformly percolate the heap. When the ore in the ore contains high eggs, the cyanide solution cannot be infiltrated into the heap, making the heap leaching impossible.

In order to carry out heap leaching on fine ore and cat soil, in 1978 the US Bureau of Mines developed a powder ore granulation heap leaching technology to promote the development of powder ore and cat soil heap leaching technology. At present, the technology is widely used in gold mines in other countries in the world, in addition to being widely used in the United States.

Granulation When the heap leaching of low-grade gold ore previously crushed to a fine 25mm or less, the gold silver minerals fully dissociated exposed ore crushed to 2.3 -4.5kg / t of dry ore Portland cement (ordinary silicon After mixing the acid salt cement, the mixture is wetted with water or a concentrated cyanide solution to make the water content 8% to 16%. The wetted mixture is mechanically tumbling to form a spherical pellet. After curing for more than 8 hours, it can be sent to the pile for leaching and leaching. The method of pile up and seepage is the same as the conventional heap leaching method.

A large-scale comparative test was carried out using lime or cement as a cating agent. Tests show that cement is superior to lime. Adding 2.3-4.5 k t of cement as a cating agent can produce relatively stable agglomerates with high porosity and good permeability. When leaching, the ore does not move, no channeling occurs, and leaching There is no need to add a protective base.

At present, there are two kinds of granulation methods used in production, namely, a multi-belt conveyor method and a drum granulation method. The multi-belt transport mechanism granule method is that the material is uniformly mixed with the concentrated solution, the powder ore and the cement through the mixing rod of the discharge end of each belt conveyor to make the agglomerates of the fast. The drum granulation method is to feed the ore and powder ore mixture into a rotating drum, and spray it in the drum.

The cyanide solution wets the mix to a water content of 8% to 16%. The wetted mixture is mechanically tumbling to form a spherical pellet. After curing for more than 8 hours, it can be sent to the pile for leaching and leaching. The method of pile up and seepage is the same as the conventional heap leaching method.

Production practice has proved that the granulation and solidification of fine ore by ordinary Portland cement, water or concentrated solution can significantly increase the flow rate of the proposed reagent through the heap. Compared with conventional heap leaching, granulation heap leaching has the following significant advantages:

(1) It can handle fine-grained gold ore with low-grade fine-grained gold ore and high-grade fine-grained gold ore;

(2) The fine-grained gold ore is directly granulated and heaped without classification, which eliminates the particle size segregation during the pile-up, which can greatly reduce the channeling phenomenon during the flooding, so that the leaching agent can uniformly pass through the entire heap, thereby significantly shortening the leaching. Cycle and can greatly increase the leaching rate of gold;

(3) The porosity of the agglomerates leads to good ventilation performance of the entire heap, which can increase the concentration of dissolved oxygen in the solution and accelerate the dissolution of gold;

(4) The agglomerates improve the permeability of the heap, and can appropriately increase the height of the heap, reduce the cost of pretreatment liners per unit ore and reduce the floor space;

(5) Porosity allows the residual cyanide leachate to be eluted more thoroughly after the end of the leaching.

Backpacking Tent

This category is a range of backpacking Tents.

Backpacking Tent Capacity
Backpacking tents are categorized by capacity: from 1- to 4-person models. Most tent names include a
number for the capacity: Outerlead Dome Tent 2, for example.
To save weight, backpacking tent interiors are [cozy." No industry standard defines per-person
dimensions, so a 2-person tent size can vary from brand to brand. And ultralight models are
likely to be extra compact.
If you`re larger than average, or you simply crave a little more space, one option is to look at
tents designated one person larger than your group. Alternatively, you can hunt for a tent
that`s one or two inches wider or longer than average. Some offer clues in the name: adding
a [plus," for example. Always compare the exact dimensions of the tents you`re considering,
though, if having more floor space is important to you.

Backpacking Tent Seasonality
Your main choice is between a 3-season and a 4-season tent. The vast majority of hikers,
especially newcomers to the backcountry, will choose a three-season tent. Because worst-case
weather scenarios won`t be the same for every trip, frequent backpackers sometimes
choose to own more than one tent.

Our products are of high quality, easy to carry, available in a variety of sizes, and adjustable in structure
to provide you with a great experience. We provide product pictures and basic parameters of
each backpacking tent and high-quality backpacking tents; look forward to your cooperation!