SJ/T 11795-2022Test method for determining magnetic impurity content of electrode materials in lithium ion batteries (English PDF)

4.1 General provisions

In accordance with the provisions of SN/T 0799.

4.2 Batches

4.2.1 Batches of cereals, oils and feedstuffs

The requirements for batches are as follows.

4.2.2 Batches of grease

The amount of grease delivered in a single contract or transport document.

5.1 Single tube sampler

Applicable to the sampling of bagged cargo. There are three types that are commonly used.

5.2 Double-sleeve sampler and slot receiver

Applicable to sampling of bulk static cargo.

According to the actual loading transport tools, the size of the cargo, the storage of cargo, use double sleeve sampler of different specifications, length.

5.3 Sampling shovel

The shovel length is about 13cm, the width is about 8cm, the side height is about 4cm, the handle length is about 8cm. See Figure A.1 of Annex A.

5.4 Automatic mechanical sampling device

Applicable to dynamic cargo sampling. The device mainly consists of four parts.

5.5 Deep-layer sampler

A semi-automatic sampling device that mainly consists of several connectable stainless steel sampling tubes, an electric suction host, sample collection device and base or strap, of which its sampling tube can be assembled to a length of about 30m as required to extract deep-layer sample of the cargo.

5.6 Other sampling tools

5.6.1 ellis cup

A manual sampling device made of lightweight aluminum for drawing samples from cargo running on conveyor belts.

5.9 Sample dividing cloth or suitable bedding

Plastic film or other material bedding for on-site sample processing.

5.10 Sample bag (tube)

Container made of strong, hygienic material that can seal.

5.11 Bottom sampler

This bottom sampler (see Figure A.2) is of stainless steel structure and is suitable for withdrawing bottom samples from liquid oil contained in tanks or oil tanks.

5.12 Simple counterweight sampling tank

The simple counterweight sampling tank (see Figure A.3) is suitable for sampling at different depths in a variety of storage tank.

5.14 Tube sampler

Applicable to sampling of paste grease. (See Figure A.5). It is a stainless steel device consisting of two concentric tubes of the same length and close together, one of which can rotate in the other tube. Each tube has a longitudinal opening.

5.15 Sampling probe

Sampling probe (see Figure A.6) is used for stearin sampling. It is made of stainless steel, with semi-circular or C-shaped cross section. When it is twisted and inserted into grease, it shall obtain a sample of oil.

5.18 Sample bottle

Plastic bottle or glass bottle, capacity of 250mL ~ 1000mL.

5.19 Stainless steel spoon

Total length is 15cm ~ 20cm, handle length is 10cm ~ 15cm, the spoon is elongated and elliptical.

5.20 Other sampling and sample preparation tools and devices

Other tools and devices for sampling and sample preparation.

6.1 Warehouse or storage tank sampling

The cargos are stored in warehouses, cabins or storage tanks, sampled in batches.

6.2 Sampling when unloading

Perform cargo sampling during loading and unloading.

7.1 Sampling of bulk cargo

7.1.1 Sampling of bulk cereals, oils and feedstuffs

7.1.1.1 Determination and requirements of sampling amount, site

7.1.1.1.2 Bulk stacking

The bulk open stacking sets a sampling zone with an area not exceeding 50m2, a height of about 1.5m. 5 sampling points are evenly set up in each zone. When it exceeds the specified area, it shall increase the number of sampling point proportionally. Stacking height in principle does not exceed 1.5m.

7.1.1.1.4 Ship-cabin

Based on different loading number of single ship, perform the sampling according to the following methods.

7.1.1.1.5 Silo

In general, no manual sampling is used in the silo. For silos with mechanized sampling equipment, the cargo entering and exiting the silo adopts the device specified in 5.4.Extract a small batch of samples when 1000t enters and exists the silo. According to the unloading flow rate, set the device sampling frequency at least 50 times.

7.1.1.1.6 Container bulk

If the number of cargo submitted for inspection of same inspection number, same variety, same level is less than 10000t, extract one original sample per

500t. The sample number is not less than 5kg. When it is less than 500t, it shall be calculated as 500t and extract one original sample.

7.1.1.1.7 Mobile cargo

If original samples are required taking from mobile cargo (conveyor, grab or other loading device), it shall according to the loading conditions of original cargo, refer to 7.1.1.1.1, 7.1.1.1.2, 7.1.1.1.3, 7.1.1.1.4, 7.1.1.1.5, 7.1.1.1.6, determine the number of batches, number of samples. Then according to the mass, delivery time and flow speed of the cargo to be inspected, estimate the sampling interval time and number of extraction each time.

7.1.1.2 Sampling operation

7.1.2 Sampling of bulk grease

7.1.2.1 Precipitate layer, emulsion layer and free

Extract bottom samples with bottom sampler. Determine whether there is precipitate layer, emulsion layer and free water at tank bottom or cabin bottom.

Remove free water as much as possible before sampling. And according to the contract requirements and the agreement of the parties concerned, measure the amount of water removed.

7.2.1.1.2 Determination of sampling site

Based on different loading state, the sampling shall be performed according to the following methods.

7.2.1.1.1.1, a representative sample shall be taken from the tank, and the sample cannot be taken from the unloading warehouse.

7.2.1.2 Sampling operation

7.2.1.2.1 Single-sleeve sampler

Hold the handle of the sampler, flow mouth facing downwards. Insert from the corner of the bag or the bag diagonally into 1/2 or more of the bag. Rotate the sampler at 180°. Make the flow mouth upwards. Hold for a moment. Make the cargo flow into the sampler probe.

7.2.1.2.2 Sampling shovel

According to different sampling method, the operation shall be performed as follows.

7.2.1.2.3 Double-sleeve sampler

See 7.1.1.2.1.

7.2.2 Sampling of piece-packed grease

7.2.2.1 Sampling proportion of piece-packed grease

If it is considered that an inspection lot is fairly uniform, randomly select packed cargo sampling. For different specifications of the packaging, the number of samples can be according to the recommended values in Table 2.The quantity of each sample shall be basically the same, the quantity shall be controlled over

100g, and the number of samples in each batch shall not be less than 1000g.

7.2.2.2 Sampling of piece-packed liquid grease

Plug the sampling tube with thumb, block the upper mouth and insert into the bottom of the bucket. Check the bottom for clear water and impurities. Then completely mix the grease in the bucket. Insert the sampling tube obliquely into the bottom of the bucket.

8.1 Preparation of laboratory samples of cereals, oils and feedstuffs

8.1.1 Reduction method

8.1.1.1 Reduction method of sample divider

Keep the clean and dry sample divider steady. Turn off funnel switch. Pour the sample into the funnel from 5cm above the funnel.

8.1.1.2 Method of quartering

Pour the sample on a clean, dry mixing table. Each hand holds one sample dividing plate to shovel the sample from the left and right sides to about 10cm height, aiming at the center and falling at the same time. Then change to its vertical direction to perform the same operation (center point remains unchanged). Repeatedly mix 4~5 times in this way.

8.1.1.3 Spoon sampling

Pour the sample in a clean, dry white porcelain square plate or on a sample dividing table. Mix evenly and carefully with sample dividing plate. Tile into uniform thickness squares. Divide grids. Use a spatula to scoop samples from each grid, with no less than 16 samples, and the number of samples in each grid shall be the same.

8.2 Preparation of grease laboratory sample

8.2.1 Preparation of bulk grease laboratory sample

Where tankers or tanks WITHOUT clear water and impurities at the bottom, the extracted samples are representative samples of the tankers or tanks.

8.2.2 Preparation of piece-packed grease laboratory sample

The sample extracted according to sampling proportion and contained in the mixing bucket shall be the laboratory sample of this batch of grease.