Dachang tin ore is rich in resources, but rich ore is nearly exhausted, will be large-scale mining is the main ore body No. 92 ore body lean. Compared with rich ore, the ore body has a very different ore nature. In order to improve the selected grade of the plant, it is necessary to carry out pre-selection and waste-discharging process, equipment and industrial test research on the coarse-grained (+ 3 ~ - 20mm) lean tin ore of No. 92 ore body. The results of industrial tests show that: the BATAC jig is pre-selected and discarded, the operation rejection rate is 34.18%, the recovery rates of tin, lead and zinc are 92.46%, 84.45% and 85.77% respectively; the scrap rate of raw ore is 27.4%, tin, The lead and zinc recovery rates were 95.01%, 91.83%, and 91.87%, respectively; the jig processing capacity reached 311t/h. It is feasible to use the BAT2AC jig to treat the lean tin ore for pre-selection and throwing waste. Lean tin ore dressing technology consultation 15084821323.
"Gravity Die Casting. A permanent mould casting process, where the molten metal is poured from a vessle of ladle into the mould, and cavity fills with no force other than gravity, in a similar manner to the production of sand castings, although filling cn be controlled by tilting the die."
Gravity Die Casting
Sometimes referred to as Permanent Mould, GDC is a repeatable casting process used for non-ferrous alloy parts, typically aluminium, Zinc and Copper Base alloys.
The process differs from HPDC in that Gravity- rather than high pressure- is used to fill the mould with the liquid alloy.
GDC is suited to medium to high volumes products and typically parts are of a heavier sections than HPDC, but thinner sections than sand casting.
There are three key stages in the process.
- The heated mould [Die or Tool] is coated with a die release agent. The release agent spray also has a secondary function in that it aids cooling of the mould face after the previous part has been removed from the die.
- Molten metal is poured into channels in the tool to allow the material to fill all the extremities of the mould cavity. The metal is either hand poured using steel ladles or dosed using mechanical methods. Typically, there is a mould [down sprue" that allows the alloy to enter the mould cavity from the lower part of the die, reducing the formation of turbulence and subsequent porosity and inclusions in the finished part.
- Once the part has cooled sufficiently, the die is opened, either manually or utilising mechanical methods.
Advantages
- Good dimensional accuracy
- Smoother cast surface finish than sand casting
- Improved mechanical properties compared to sand casting
- Thinner walls can be cast compared to sand casting
- Reverse draft internal pockets and forms can be cast in using preformed sand core inserts
- Steel pins and inserts can be cast in to the part
- Faster production times compared to other processes.
- Once the tolling is proven, the product quality is very repeatable.
- Outsourced Tooling setup costs can be lower than sand casting.
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