From JinChan Laboratory Testing to an Industrial Trial

Why the Laboratory Is Not the Plant

In the laboratory, it is easier to maintain specified conditions, work with a homogeneous prepared test portion, and control individual parameters.

At a larger scale, ore variability, actual equipment performance, movement and mixing of slurry or solution, reagent addition, withdrawal and return of process solutions, and the sequence of process operations all become relevant.

Laboratory conditions are therefore the starting point for further verification, not an automatically completed industrial operating procedure.

Scale-up is the verification of operating conditions under new circumstances, not an arithmetic enlargement of a laboratory test.

Laboratory test

A small, controlled test used to investigate the metallurgical response of a specific material.

Larger-scale trial

The next scale of investigation, using more material under conditions closer to the actual process.

Pilot plant

A specially configured process circuit that reproduces key elements of a future or existing process at a reduced scale.

Industrial trial

A controlled test conducted directly on production equipment or part of it.

Not every project must pass through all of these stages. The specific sequence is determined by the operational objective and the level of available data.

What Must Be Known Before Scale-Up

The results of the laboratory program must be documented before the next stage.

Material Representativity Remains Critical

The issue of representativity does not end after the laboratory stage. Material for the next stage must correspond to the feed on which the technology is intended to be applied.

If an operation processes variable ore, a test on one unusual or specially selected lot should not automatically be applied to the entire deposit or the complete future feed stream.

Laboratory Conditions Become the Starting Hypothesis

The selected laboratory parameters should be used as the documented starting point for the next stage, not as previously proven industrial operating conditions.

When moving to a larger-scale trial, it is necessary to know which parameters were specified, which values were actually achieved, how they were measured, and how consistently they were maintained.

This makes it possible to distinguish a genuine scale effect from a simple change in test conditions.

What Changes as Scale Increases

As the scale increases, the laboratory system is no longer a small, isolated vessel.

The result becomes more dependent on the organization of material feed, actual mixing and phase contact, equipment design, sequence of operations, solution management, stability of reagent addition, and available process-control capabilities.

The specific direction of each factor’s effect is established from the trial data; increasing scale does not necessarily mean that recovery will decrease.

Why Process Time Cannot Be Transferred Mechanically

Laboratory test duration and the actual residence time of material in an industrial process are not automatically interchangeable quantities.

Particular caution is required when interpreting a small batch test in relation to continuous production, because the conditions in these systems may differ.

The methodological work by Brittan and Plenge concerns cyanidation. Its chemical and numerical parameters are not recommendations for JinChan.

Monitoring JinChan at the Next Stage

Guangxi Senhe recommends monitoring the gold grade in the pregnant solution, pH, and JinChan concentration during application. The manufacturer also recommends determining suitable conditions in advance through a beneficiation test on the specific material.

Measurement frequency and sampling points must be defined by the program for the specific trial.

Actual Parameters, Not Only Setpoints, Must Be Recorded

It is not sufficient to record only a planned value, such as “pH set to 11–12.” Actual measured values must be recorded over time in accordance with the trial program.

Similarly, the target reagent feed, the amount actually added, and the measured concentration in solution must be distinguished.

Evaluation of an industrial trial requires actual process data, not only the values that were intended to be maintained.

Verifying Stability of the Operating Conditions

A good result obtained once does not yet describe the stability of the metallurgical process.

At the next stage, it is important to see how the selected conditions perform under actual variability in feed, throughput, process conditions, and process solutions.

The quantitative stability criterion and observation period are defined by the program for the specific trial.

Comparison with the Laboratory

A difference between the laboratory and a larger-scale trial is information that must be explained, not something that should automatically be treated as an error in one of the tests.

Why Material Accounting Is Required

During a large-scale trial, traceability must be maintained for the quantity of material processed, gold grade of the feed material, process solutions, solid products, and intermediate samples when they affect the balance.

The larger the test scale, the more important correct accounting of material streams and analytical results becomes.

When the Next Conclusion Can Be Drawn

A decision on further scale-up must be based not on a single recovery value, but on the complete data set describing the feed, stability of the operating conditions, analytical results, and actual process conditions.

If the results differ from the laboratory results, the possible cause of the difference must be established before final operating conditions are defined.

A successful industrial trial is not automatically a completed plant design.