FIRE ASSAY

FIRE ASSAY CLAY CRUCIBLE

Not content with offering one shot disposable crucible, Decent fire assay clay crucibles have well-deserved reputation for multi-use firings. This feature of Decent fire assay clay crucibles provides our customers with important benefits of reducing cost per firing and increasing profitability. We manufacture fire assay clay crucibles with the latest automated technology and can guarantee the sizing consistency which is critical with multi-pour systems and automated lines. Meanwhile, carefully selected raw materials and more reasonable formulation with low caustic soda, low iron content and high silicon content enable our fire assay clay crucibles to ensure high temperature resistance up to 1500°C.

Product Details

BRIEF INTRODUCTION

50G Crucible DrawingNot content with offering one shot disposable crucible, Decent manufactures and supplies fire assay clay crucibles which have well-deserved reputation for multiple firings. Our standard range of fire assay clay crucibles from 30G to 75G can be proceeded 3-5 times firing. For some formula of flux, our fire assay clay crucibles can be even used in 9 times. This feature provides our customers important benefits of reducing cost per firing and increasing profitability. And we can also desgin and supply to our customer's individual requiremetns and specifications.

We manufacture fire assay multi-firing clay crucibles with the latest automated technology and so we can guarantee sizing consistency which is critical for multi-pour systems and automated lines. Meanwhile, carefully selected raw materials and more reasonable formulation with low caustic soda, low iron content and high silicon content enable our fire assay clay crucibles to ensure high temperature resistance up to 1500°C.

We are the only Chinese manufacturer which has complete in-house capability for all production processes of fire assay clay pots, including making clay by ourselves. This ensures best control in quality, cost and order lead time from the beginning of production of fire assay clay crucible. So we keep supplying multiple firing fire assay clay pots to many well-known fire assay laboratories in all over the world.

QUALITY CONTROL

We have strict quality control and inspection to every batch of crucibles and following process is proceeded to all batches of pots we produce and supply.

Visual Check & Inspection: Pots are randomly selected from crates package according to sampling rate. All randomly selected pots are weighed to check weight variability. Then the durability in the pots is tested by striking the pots increasingly harder. After these tests, the pots are cut in half to provide a cross section, which enables QC to check the consistency of grain size and external profile in height and width.

Use Tests: Randomly selecting some pots again according to sampling rate and then adding flux without silica in pots to ensure the pots are tested aggressively. Then placing these crucibles into fusion furnace which has been set at 1050°c for 1 hour to replicate normal fusion conditions. This process is repeated in 5 times. The test result can be recorded as Pass if no noticeable difference in pouring is observed between the two different pots and no lead splashing on the moulds occurred and no any structural damage, ie cracks or holes in the walls, to the crucibles.

Above photo is the status of our fire assay clay crucibles after 5 fires which has no any structural damage (Borax constituent of flux attacks the material of crucible and can cause structural defects) and no any showed signs of being compromised ie cracks or holes in the crucbile walls. From the photo we can notice that the crucible walls are less eroded and still appear smooth appearance. All these approve the premium quality and multiple firings feature of Decent fire assay clay crucible.


Above photo shows the boilover status of our fire assay clay crucbiles after 5 fires, which show less evidence of boilover and also approves the premium quality and excellent multi-trip feature.

PRODUCTION

Fire assay clay crucible is made of fire clay and proprietary additives and has an extremely long history in the gold business. Its use is referenced in historical texts that are more than 3000 years, which when you think about it, is no surprise really. A crucible is, in simple terms, a ceramic cup, that’s why it is also called “pots”.

A modern fire assay pot is not that far removed from those of the past with the exception of the additional science behind its composition. Modern crucibles are made for mineral and Geochem laboratories use rather than refining and so are required to be exacting in their specifications. What’s more they should be strong enough to withstand huge changes in temperature through multiple uses.

Decent has more than 20 years experiences in the industrial ceramic and refractory industry, including fire assay clay crucible. We have complete in-house capability for all production processes of fire assay clay pots as below:

                

Ball Milling Raw Materials                     Compression Filtration

Vaccum Pugging                                                  Moulding

                                                                            Chain Drying                             Firing                                                         Firing

PACKAGE

After all tests have been done and results are Pass, the related batches of crucible will be put into wooden crates or cartons with pallet according to customers’ requirements. Then QA stamp and production serial no. will be marked onto the packages.

We hold stock in both our facility and warehouse in Qingdao port for various consignment deliveries requirements to any location around the world.

TECHNICAL PARAMETERS

Besides the models and dimensions of fire assay clay pots listed below, we are also able to produce any model and size of fire assay clay pots according to customer's requirements.

Model No.

AKA

gram

Volume

ml

Top OD

mm

Height

mm

Base OD

mm

Pcs / Crate

Pcs / Container

DC30

30G

245

85

107

55

2600

52,000

DC40

40G

350

88

130

55

2000

40,000

DC50

50G

430

105

150

57

1530

30,060

AP

A Pot

455

105

132

57

1290

25,800

DC55

55G

470

88

155

57

1500

30,000

DC65

65G

500

105

165

57

1425

28,500



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