Calcium hydroxide powder selection is to make the extracted calcium hydroxide mesh more pure. There are many kinds of powder separators, such as centrifugal, three-separation, fly ash and other different types. Qualified powder is selected.
In the process of calcium hydroxide production, even if it is produced by professional calcium hydroxide production line equipment, it is almost inevitable to mix impurities. In order to improve the quality and purity of calcium hydroxide powder, it is necessary to select qualified powders. For this qualification, in addition to requiring purity, the fineness of the powder should also be distinguished.
Small calcium hydroxide powder also has many parameters. It is based on these parameters that people keep thinking about the method of powder selection and design a powder separator. For example, according to the quality and density of the powder, under a certain wind speed, the powder can be divided into two piles with a cyclone separator. Obviously, the pile is needed, and the pile is the so-called impurity.
For the powder separator, the simpler the structure, the better, and the overly complicated powder selection channel is not conducive to the discharge of the selected powder from the powder selection device.
Due to the centrifugal force of the calcium hydroxide powder separator during the powder selection process, it is inevitable that dust will occur. When it comes to dust removal, the first thing that comes to mind is the pulse bag filter.
Pulse dust removal adopts pulse bag type dust removal technology, which overcomes the shortcomings of conventional pulse dust collectors and sub-chamber back-flushing dust collectors. The land area is small, the operation is stable and reliable, and the economy is good. And the falling powder can be recycled and reused, which is a link to reduce the cost of producing calcium hydroxide powder, which overcomes the problem of re-pollution of water dust removal. Any conveying device falls directly into the digester and enters the powder selection system.
Moreover, the clean hot air after dust removal enters the vertical heat conversion device to heat and digest water. In this way, the equipment is protected, the later maintenance is simple, and the impact of dust emission pollution on the surrounding environment can be greatly improved in terms of environmental protection, and the working environment of workers is also greatly improved.
In addition to pulse bag dust removal, there is also a water dust removal method. The water precipitator is a device that makes the dust-containing gas in close contact with water, and uses the inertial collision of water droplets and particles and other effects to capture or increase the particles. The manufacturing cost of the water precipitator is relatively low. However, it is an ideal dust removal method for dust with moisture, stickiness and irritating odor generated in the chemical industry, painting, glaze, pigment and other industries.
In comparison, water dust removal is an ideal dust removal method in the calcium hydroxide powder selection process. How to deal with calcium hydroxide after dust removal?
1. Powdered products are used in bleaching, hydrometallurgy, sewage treatment, sugar refining, papermaking, paint, glass production, food industry, etc. In organic chemistry, calcium hydroxide is widely used as a strong base.
2. Paste calcium hydroxide is used for building materials, protecting tree trunks and painting walls.
3. Liquid calcium hydroxide reacts with carbon dioxide to produce calcium carbonate, and liquid lime milk (calcium hydroxide particles suspended in water) can also be used for water treatment, dry flue gas purification, etc.
The energy saving way in calcium hydroxide production is mainly reflected in the selection of digestion equipment. The trough type drying machine and the wet drying machine are ideal equipment, which can be digested with cold water to keep it in a boiling state, so that the product quality is excellent and the energy consumption is low.
The environmental treatment in the production of calcium hydroxide is mainly alkaline dust treatment. First, a closed production line should be selected. Material conveying, feeding, dividing, and packaging equipment should be closed for operation to prevent the overflow of alkaline dust. The digestion steam should be dry. , Wet dust removal to recover steam and dust; crushing and grinding should be carried out under airtight or slightly negative pressure to prevent dust leakage.