What is the responsibility of the laboratory control group in cement plant?

sequence

Page, face, sheet and edition

control

manufacture

square

law

Fineness test

Preparation before testing

1. 1. 1

Always check the sieve used, the sieve must be intact, and the seam on the edge of the sieve must be tight and big.

Some sieve holes are clear and not blocked.

1. 1.2

The movable part of the screen seat should be flexible, and the hole of the nozzle should be smooth. If the nozzle hole is blocked, use the sewing needle in time.

Or thin metal wire.

1. 1.3

Test water must be clean, and water containing mud, sand and other sundries cannot be used. Measures such as sedimentation and filtration should be adopted.

Only after cleaning can it be used.

1. 1.4

Prepare the heater, evaporating dish (or drying plate) for the test.

, a small brush, a timer, sensitivity is

0.0 1

Kedetian

Equality.

1. 1.5

Test samples should be thoroughly mixed and passed.

0.9

Millimeter square hole screen.

1.2

Test operation

1.2. 1

Will be weighed

Pour the G sample into one side of the sieve, gently turn on the faucet with one hand, and hold the sieve with the other hand and place it obliquely under the nozzle.

During flushing, the water in the nozzle is gradually diluted, and the cement poured on one side flows to the other side and flows out through the sieve holes, while maintaining.

The sieve hand swings back and forth under the nozzle to speed up the passage of fine powder and prevent the sample from blocking the sieve hole.

1.2.2

When screening, the water sprayed by the nozzle should not be sprayed directly on the screen, but should be at a certain angle to make some water tangent.

The direction is sprayed on the screen frame, and some water is sprayed on the screen to make the screen rotate. The angle should be controlled to make the screen rotate.

Speed per minute

50 2

Turn, the water pressure is about

0.05 0.02 MPa

When cleaning and sieving, be careful not to spill samples.

Outside the sieve.

1.2.3

sieve analysis

three

Take off the sieve in minutes, hold the sieve with one hand and the nozzle or hose with the other hand, and rinse the sieve residue with water.

One side, and then use a small stream of water column to slowly move the sieve residue into the evaporating dish (or drying dish) to screen out the residue in the evaporating dish.

After precipitation, the water flows out obliquely, then the evaporating dish is rotated, the sieve residue is spread on the four walls, and then it is dried on the heater.

1.2.4

Generally, the heater is an electric furnace, and the evaporating dish cannot be directly placed on the electric furnace plate to prevent the sieve residue from being heated unevenly during rapid heating.

Explosion and splash can be separated by asbestos board, or placed on a wire rack at a certain height from the electric furnace. When everything is dry, use a brush.

Tap the evaporating dish lightly, and the net residue stuck on the wall will automatically concentrate on the bottom of the dish.

1.2.5

After drying, take out the evaporating dish, and when it is cold enough not to burn your hands, gently brush the sieve residue into the balance plate with a small brush.

Weigh, accurate to

0.0 1

G, sieve weight multiplied by

four

Percentage of sample residue (accurate to

0. 1

, remember at

In the notebook.

1.2.6

After the test, brush the blocked sieve hole with a brush to keep it clean. be in common use

Acetic acid or food must be used after each time.

Wash with vinegar. Commonly used sieves can be stored in water, and those that are not commonly used can be stored after drying.