Samples containing a noble metal element before the analysis must have two conditions: â‘  the sample should be uniform; â‘¡ samples should be representative. Otherwise, no matter how accurate the analytical method is or how serious the analyst's operation is, the results obtained are often meaningless. In addition, with the development of science and technology, precious metal resources are widely used in various industrial sectors and technical fields. Due to the gradual reduction of precious metal resources, the contradiction between supply and demand is becoming increasingly prominent, and its price is becoming more and more expensive. Therefore, the accuracy of analytical results is more demanding than other metals. high.

In order to obtain accurate analysis results, the precious metal samples are sampled and sampled before analysis, and the decomposition of the samples will be an important part of the entire analysis. On the other hand, since in most analytical methods, the analytical results obtained are often obtained by comparison with known standard substances, including standard solutions and standard samples, accurate analytical results are also dependent on Accurate preparation of precious metal standard solutions.

The sampling and processing of precious metal ore minerals is to obtain samples with good representativeness and uniformity, so that the content of precious metals in the tested samples can reflect the original ore conditions more realistically and avoid the errors caused by sampling. The state of occurrence of precious metals in nature is complex and due to the low content of precious metal elements. Therefore, the sample size of the analysis sample must meet the accuracy requirements of the two factors 1 analysis; 2 the uniformity of the sample, that is, the average content of the elements to be tested in the small sample taken out should be consistent with the average content in the entire analysis sample. In fact, the distribution of precious metal elements in the ore is not uniform, and is often concentrated in a small number of mineral particles. It is difficult to achieve the requirement that the extracted sample is completely consistent with the total sample. Therefore, sampling can only be performed within the required analytical error range, and the sampling amount can be increased, and the analysis error may be reduced. The crushing particle size of the precious metal mineral in the sample has a great relationship with the sampling amount. The larger the particle size, the more uneven the sample, and the larger the sampling amount, so the mineral sample should be ground as much as possible. In order to achieve a certain measurement accuracy, in addition to the conditions for satisfying the above sampling amount, the sensitivity of the measurement method should also be satisfied.

General mineral samples can be sampled and sampled according to conventional methods. Jindu is present in ore minerals in the form of natural gold. Its particle size varies greatly, and it can reach more than kilograms, and tiny particles are difficult to distinguish even under the microscope. Gold has a good ductility, and its breaking speed is slower than that of gangue. Therefore, the unsifted and residual part of the sample in the sieve must not be discarded. Most of this part contains natural gold. The sampling and processing of gold ore is generally carried out according to the Chejout empirical formula. For a relatively homogeneous sample, K is 0.05, for a typical gold ore sample, K is 0.6-1.5.

For gold ore that is difficult to process, add a disc grinding sample and grind to 0.154mm before the rod grinding, because the rod mill is used to impact and squeeze the rock with steel rods and then grind fine gold particles to meet the general gold particles. The required crushing size for the finer sample. For samples containing coarser gold particles, the rod mill can only press the gold particles into a sheet or strip shape, which does not achieve the purpose of crushing. The disc grinding machine uses the force of rolling to make the coarser materials such as quartz crush the gold particles to achieve the purpose of crushing.

In the processing of gold ore samples, the following aspects should be noted:

1. If the weight of the ore sample is below 1kg, it should be ground to 200 mesh when the sample is broken. Half is sent for analysis and half is used as a secondary sample. If the weight of the ore sample is above 1kg, it will be crushed according to the processing flow. The weight of the sample for basic analysis should not be less than 500-600g.

2. If the sample contains gold, the process of 80 mesh sieving and sifting on the screen should be added.

3. For 1:200000 regionalized water-spraying sediment samples, the original analytical sample should be mixed and then taken 40g, pulverized to 200 mesh by disc grinding, and mixed as a gold sample.

4. In the process of sieving and shrinking, the sieve and the lost sample cannot be discarded at any time.

5. All kinds of equipment used must be thoroughly cleaned after processing one sample, and carefully check for gold residue in the gap.

6. After the ore sample is crushed to 200 mesh by a rod mill, it must be mixed before being sent to the analysis to prevent the sample from being uneven due to the high density of gold during the long time of storage or the sinking of gold during transportation.

Due to the non-uniformity of gold in the ore, it is necessary to obtain a representative ore sample for analysis, and the ore sample volume should be increased as much as possible. During the grinding process, the gold separated from the coarse particles should be treated separately. The sampling and processing of other precious metal ore samples is easier than gold ore.

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