Mixing Vessel 1000L Capacity For Chemical Manufacture

mixing vessel 1000L capacity for chemical manufacture

1. Preparation before mixing

1. Determine the formula and mixing requirements of powder mixing

2.Detect the three major characteristics of various powders

Three important physical characteristics of the powder to be mixed can be detected by the instrument, such as density and particle size (Figure 2-1, Figure 2-2). Fluidity can be measured by the pile Angle described in Chapter 1, "Overview of Powder Mixing".

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3. Calculate the gold mixture index to analyze and judge the mixing task

1) Based on the density and particle size of the powder, the alloy mixing index is calculated (for the specific method, see Chapter 7 "Alloy Powder Mixing Index").

2) Accurately judge the difficulty of the mixing task according to the gold mixing index.

3) The following measures can be adopted for mixing tasks with high difficulty:

A. Select targeted pretreatment before mixing to improve mixing conditions;

b.choose mixing equipment with high mixing strength;

c. set the appropriate mixing time.

2. Pretreatment before mixing

Only the powder that is not easily mixed uniformly needs to be pre-mixed.

1. Purpose of pretreatment

Because the powder involved in mixing has some characteristics that are not conducive to uniform mixing, such as too wet powder resulting in too large viscosity; The powder particles are too large or too heavy to "sink" and so on. The above characteristics are changed by pretreatment, so that they are easy to mix evenly with other powders.

2. Common methods of pretreatment

1) Dry the wet powder to increase its fluidity and facilitate uniform mixing;

2) When the difference between coarse and fine powder is too large, the coarse powder can be ground into fine powder so that its characteristics are close to that of uniform mixing;

3) For the false particles with strong binding force, it is necessary to be broken in advance.

III. the selection of mixing equipment

It is very important to choose the right mixing equipment, the mixing equipment on the market is various, according to the degree of ease or difficulty of the mixing task to choose a targeted mixer in order to effectively complete the mixing task.

1. Requirements for mixing equipment

For the powder situation, the equipment is required to have: high mixing uniformity, high mixing efficiency, mixing without dead Angle, low energy consumption and so on.
It is required that the mixing equipment cannot destroy the physical indicators of the powder, such as the specific gravity of the powder, the average particle size and the surface shape of the particles.
It also requires the mixing equipment to operate safely, operate easily, pass environmental protection, save electricity, save labor and so on.

2. Common mixing equipment in the market and its advantages and disadvantages
1) Gravity diffusion mixer representative model:
Three-dimensional mixer, V-type mixer
Advantages: mixed without dead corners; Macroscopically, the powder in each part of the container is uniform.
Disadvantages: the microcosmic mixing uniformity of powder particles is insufficient; The mixing efficiency is low.
2) Forced shear mixing mixer representative model:
Single cone mixer, ribbon mixer
Advantages: high mixing efficiency; Microcosmic particles of the powder are relatively uniform.
Disadvantages: mixed with dead corners; High energy consumption.
3) Gravity diffusion and forced mixing composite mixer representative models:
Double motion mixer
Advantages: high mixing uniformity, can achieve macro and micro uniformity; High mixing efficiency; High material loading rate; Low energy consumption.
Disadvantages: The equipment is relatively complex, and the procurement cost is relatively high.

3. Selection principle of mixing equipment:
1) Choose according to the difficulty of the mixed task:
Common models such as V-type machine can be selected for easy mixing tasks; On the contrary, a high-performance mixer is used.
2) For the powder with poor fluidity, the forced shear mixing type mixer can be selected.
3) For the powder that is difficult to mix, such as ultra-light powder and ultra-fine powder, the composite mixer strengthened by gravity diffusion is selected.

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