Custom Size Graphite Rod Graphite Plate High Density Graphite Crucible For Aluminum Gold Silver Melting

Double-cavity graphite ingot mold is an integrated grooved casting tool processed by CNC milling with isostatic high-purity graphite as raw material, also known as graphite melting boat, bullion casting mold and aluminum ingot forming tank. The independent dual-chamber design allows synchronous casting of two batches of metal ingots, serving two core industries: precious metal refining and recycled aluminum smelting. It is widely supplied to global jewelry factories, precious metal recycling refineries, scrap aluminum die-casting plants and laboratory high-temperature melting institutions.

Applications of Precious Metal Ingots
For the casting of precious metals such as gold, silver, platinum, and K gold, the impurity content of the high-purity graphite substrate of the mold is less than 5 ppm. During the smelting process, no impurities will be separated to alter the color of the precious metals. The gold bars and silver bars produced have smooth and flat surfaces and do not require secondary grinding and polishing.
The dual-chamber system is independently divided into different zones, allowing for the simultaneous casting of different weights and different types of precious metals. It is suitable for small-scale high-frequency gold smelting furnaces. The single smelting cycle lasts only 5-15 minutes, making it suitable for small-scale, high-frequency production in jewelry stores and precious metal recycling workshops. The inner walls of the mold are polished to a mirror finish. After the gold and silver liquids cool down, they can be completely demolded without any residual impurities, significantly reducing raw material waste.

Industrial aluminum alloy ingot application scenarios

Used for melting and casting of scrap aluminum and aluminum alloys, suitable for the working temperature range of 700-980℃ of aluminum liquid. The dense structure inside the mold can prevent the high-temperature aluminum liquid from penetrating into the graphite pores, avoiding mold bulging, perforation and报废. The large-capacity double-chamber style can produce two aluminum ingots at a time, suitable for continuous 24-hour production in medium-frequency industrial melting furnaces; the outer wall of the mold can be customized with an anti-oxidation protection groove to extend the service life under high-temperature conditions, and is a long-term repeat purchase product for aluminum recycling plants in Southeast Asia and the Middle East.

Processing Procedure Description

The entire product is manufactured through a single milling process of a solid isostatic pressure graphite block, without any joint gaps. The inner cavity is precisely polished, while external slots for flow diversion and handling slots are reserved. The finished product undergoes high-temperature impurity removal and baking treatment to remove free impurities inside the graphite. Before leaving the factory, each piece is inspected for size accuracy, density, and surface flatness, and it complies with the testing standards for export MSDS and REACH.

Product Technical Parameter Table

No.	Inspection Item	Technical Standard Parameter
1	Raw Material	Isostatic High Purity Graphite Blank
2	Fixed Carbon Content	≥99.90%
3	Bulk Density	1.75 – 1.85 g/cm³
4	Total Impurity Content (Fe, Cu, Pb)	≤5 ppm
5	Maximum Long-term Working Temperature	≤2200 ℃
6	Theoretical Heat Resistance Limit	3000 ℃
7	Internal Porosity	＜0.5%
8	Thermal Shock Cycle Resistance	More than 1200 times without crack
9	Cavity Structure	Double independent cavity (custom single/3/4 cavity optional)
10	Inner Surface Treatment	Mirror polishing, smooth demolding
11	Available Custom Service	Cavity size, outer slot, diversion port, overall dimension
12	Supporting Certificates	MSDS, REACH, Factory Inspection Report

FAQ

01.Ultra-high heat resistance performance

The theoretical maximum temperature tolerance of the graphite substrate is 3000℃, and the long-term stable working temperature is ≤ 2200℃. It completely covers the melting temperature ranges of gold, silver, and aluminum. Under high temperatures, it will not soften, deform, or collapse.

02.High density and low porosity structure

The volume density is 1.75 - 1.85 g/cm³, and the internal porosity is less than 0.5%. Molten metal cannot penetrate the mold body, eliminating the problem of material leakage and damage.

03.Excellent thermal shock resistance

The thermal expansion coefficient is extremely low. From room temperature to 1600℃, rapid heating and repeated cooling cycles of more than 1200 times will not cause cracking or corner loss. It is suitable for melting equipment with frequent start-stop operations.

04.Chemical stability and no contamination of raw materials

The fixed carbon content is ≥ 99.9%, and the total content of heavy metals such as iron, copper, and lead is ≤ 5 ppm. Under high temperatures, it does not react chemically with gold, silver, and aluminum liquid, ensuring the purity of the metal.

05.High thermal conductivity and energy saving

The thermal conductivity of graphite is far superior to that of ceramics and refractory bricks molds. The heating speed is increased by 40%, shortening the melting time of the metal, and reducing gas and electricity consumption.

06.Dual-chamber synchronous production, doubling production efficiency

Integrated dual independent chambers. In a single melting process, two metal ingots can be formed. Compared to single-chamber molds, the production capacity is increased by 100%, and the labor and equipment usage costs are reduced.

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Graphite Ingot Mold

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