GB/T 1868-1995Phosphate rock and concentrate--Methods of sampling and preparing sample (English PDF)

3.1 Sampling probes, small shovels, hammers

3.3 Platform scales, sample holders, sample bottles

4.1 Number of samples

4.1.1 The total sampling amount of phosphate rock products shall not be less than 2/10000 of the batch size; the incremental sample size shall be 800 ~ 2000 g; the incremental sample sizes at each point taken in the same batch shall be similar.

4.2.2 Sampling on the ship

If the cabin load is less than 100 t, arrange sampling points according to the sampling method from train carriage in 4.2.1. If it is greater than or equal to 100 t, arrange 20 points. If it is greater than or equal to 200 t, arrange 30 points, and so on. The sampling point is not less than 0.3 m away from the ship's side. Take incremental samples, at a depth of at least 0.1 m from the bottom and at least 0.2 m from the surface, using a sampling tool.

4.2.3 Sampling on the ore heap

On the entire surface of the ore pile, mark a number of horizontal lines, about 0.3 m from the bottom to the top, at an interval of about 1 m. Arrange sampling points at a certain distance on each line, according to Figure 4. If the total amount of ore pile is less than 50 t, arrange 5 ~ 10 points; if it is greater than or equal to 50 t, arrange 11 points; if it is greater than or equal to 100 t, arrange 20 points; if it is greater than or equal to 200 t, arrange 30 points, and so on. Take incremental samples, at a depth of at least 0.2 m from the surface, using a sampling tool.

4.2.4 Sampling on belt conveyor

According to the total amount of ore and the conveying speed of the conveyer, take incremental samples on the entire cross-section of any segment of the conveyer belt, using an automatic device or a small shovel, at regular intervals.

5.1 Phosphate rock

5.1.1 After merging the individual samples taken in the same batch, make it subject to the steps of crushing, pulverizing, grinding and so on. Each step shall include sieving.

Mix it using cone method or other methods. Use a divider or a quartering method to divide it. Each dividing shall be carried out according to the following formula:

Where: […]