As adhesive enhancer in pulp, cardboard, cardboard tubes, glass wool barrels, cardboard boxes and adhesive in packaging lines (especially detergents) are used.
In paper manufacturing plants, silicates are used to whiten and remove ink. So that the ink is removed from the paper fiber and helps to keep it suspended and prevents them from re- sedimentation on the fibers.
Silicates also stabilize hydrogen peroxide, which may be added to the formulation of ink removing.
Silicates contribute in alkalinity to de-inking operations at lower pH which is only used with sodium hydroxide. de-inking at a lower pH reduces the darkness and opacity of the solution, which is an important issue in the pulp preparation.
Sodium Silicate in Ceramic and Tile Industries
It is used as a lubricant for raw materials and slurries (mucilage adhesives). It also prevents products cracking while cooking.
In addition to the applications, it saves energy in order to eliminate water in the raw material and subsequently boosts the production efficiency.
The role of these materials in the composition of the body is to create and increase the strength of ceramic materials in order to increase the strength of these materials and preventing them from breaking during the production process as well as during their displacement and machining in the production lines.
With the use of binders due to their ability to increase strength in materials, waste and discarding materials are reduced, resulting in lower production costs. These materials are used in the body without a natural plasticizer, as well as those that require raw materials to increase their strength.
Materials used as binders, in addition to increasing the strength capability of the body, should have other properties. Including that these materials should be non-abrasive and do not leave ash after cooking operation and burn out as much as possible at the lowest possible temperature to get out of the body. These materials should also not stick to the mold and should not absorb the moisture of the environment. Binder materials should be easily soluble or emulsified to be used in the composition of the body’s slurry. In terms of price, these materials should also not increase the final price of the product.
Sodium silicate can be commonly used as binders in tile and ceramic industries. The needed weight ratio to use these binders are vary depending on the production conditions and type of body, but usually this amount should not exceed 5% by weight.
These materials should be added to the composition or process, at the various process of production (Such as body preparation, forming processes, presses, extruding systems, etc.) (Enamel processes such as Bell, Vela, Spray and …, various decoration techniques such as Felt Printing, Rotary, Printing, etc.) to help processes (such as the condition of the connection of the decor to the body, the slurry diffluxation, the uniform distribution of the materials in the whole product, the condition of the press of the products, the lubrication of the compounds, help accelerate the production process, help the production process in the injection molding method …) and increase the quality of the products by improving the slurry rheology
In white-coated bodies, poly-acids with sodium silicate are used to improve the slurry casting properties. For the best ratio, casting conditions should be evaluated. By adding polyacetals, the product crispness decreases after casting, resulting properties of the final product would be improved.
Application of sodium silicate in iron filtration process
Flotation is a physical chemical mechanical process involving the preparation of minerals substances with chemicals. In this preparation, the surface particles surface of a specific mineral is pronounced. These particles stick to the air bubbles at the surface of the mud-water (mixture of water and minerals) and carried by them to the surface of the water-mud. At the surface of the mud- water a layer of foam which is rich of mineral particles is formed.
This layer of foam is collected from the mud surface, while mineral particles or other minerals remain inside the mud. (This is also important in water purification) (theoretically, this method can be used to separate minerals in special conditions).
Mineral particles should be small enough to be carried by air bubbles, and various minerals should be separated from each other too. (Note: particles smaller than ten or twenty microns are in size). The flotation method efficiency for fine particles is too limited. A necessary condition for the flotation process is the bonding of mineral particles with air bubbles, so that they can be transported along with air bubbles to the surface of the mud, where they can be separated and collected.
Sodium silicate is used in the reverse floatation process of mineral concentrates, especially iron (hematite) as a detoxifier and in some cases as a pH regulator. For example, iron is used to lower the percentage of phosphorus in the concentrate.