Properties of water glass in inorganic salt manufa

2022-07-22
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Water glass is widely used in almost all sectors of the national economy. Water glass, commonly known as bubble alkali, is a water-soluble silicate, and its aqueous solution is commonly known as water glass, which is a mineral binder

water glass is divided into sodium water glass and potassium water glass, commonly known as bubble alkali. The following editor will introduce the relevant knowledge of water glass in detail

chemical composition of water glass:

water glass is a soluble alkali metal silicate material formed by the combination of alkali metal oxide and silicon dioxide, also known as bubble alkali. Water glass can be divided into sodium water glass and potassium water glass according to the types of alkali metals, and their molecular formulas are Na2O Nsio2 and k2o nSiOz. The coefficient n in the formula is called the modulus of water glass, which is the molecular ratio (or molar ratio) of silicon oxide and alkali metal oxide in water glass

modulus of water glass is an important parameter of water glass, generally between 1.5-3.5. The larger the modulus of water glass is, the more difficult the solid water glass is to dissolve in water. When n is 1, it can be dissolved in normal temperature water, when n is increased, it needs hot water to dissolve, and when n is greater than 3, it needs steam above 4 atmospheres to dissolve. The larger the modulus of water glass is, the more the silicon oxide content is, the viscosity of water glass increases, it is easy to decompose and harden, and the bonding force increases

water glass can be produced by dry method and wet method. The dry method uses quartzite and soda ash as raw materials, grinds and mixes well, melts in the furnace at the temperature of 1300-1400 ℃, reacts according to the following formula to produce solid water glass, which is dissolved in water to produce liquid water glass. The wet production takes quartzite powder and caustic soda as raw materials, in a high-pressure steamer, 2— The autoclave reaction is carried out under 3 atmospheric pressure to directly produce liquid water glass

properties of water glass:

1. High bonding strength: water glass has good bonding ability. Silicic acid gel precipitated during hardening can block capillary pores and prevent water penetration

2. Good heat resistance: water glass does not burn. Silicic acid gel dries more strongly at high temperature, and its strength does not decrease, or even increases. It is used to prepare water glass heat-resistant concrete, heat-resistant mortar, heat-resistant mastic, etc

3. Strong acid resistance: water glass can withstand the action of almost all inorganic and organic acids except hydrofluoric acid, overheated (above 300 ℃) phosphoric acid, higher fatty acid or oleic acid. It is used to prepare water glass acid resistant concrete, acid resistant mortar, acid resistant mastic, etc

4. Poor alkali resistance and water resistance: water glass cannot be completely hardened after adding sodium fluosilicate, and there is still a certain amount of water glass. Because water glass is soluble in alkali and water, it is not alkali and water resistant after hardening. In order to improve the water resistance, the hardened water glass can be treated with medium concentration of acid

uses of water glass:

water glass is widely used in chemical systems to produce silica gel, silica, zeolite molecular sieve, sodium metasilicate, silica sol, layered silicon, instant powdered foamed alkali, potassium sodium silicate and other silicate products. It is the basic raw material of silicon compounds. In light industry, it is an indispensable raw material in detergents such as washing powder and soap, as well as a water softener and sedimentation aid; Used in textile industry for dyeing aid, bleaching and sizing; It is widely used in casting, grinding wheel manufacturing and metal preservatives in the machinery industry; In the construction industry, it is used to manufacture fast drying cement, acid resistant cement, waterproof oil, soil curing agent, refractory materials, etc; Silicon fertilizer can be made in agriculture; In addition, it is used as silicon aluminum catalyst for petroleum catalytic cracking, filler for soap, adhesive for corrugated paper, metal preservative, water softener, detergent additive, refractory and ceramic raw materials, bleaching, dyeing and sizing of textiles, mineral processing in mines, waterproofing, plugging, subway grouting, wood fire prevention, food corrosion prevention and adhesive making

1. Configure quick setting waterproof agent

take water glass as waterproof base material, add two, three or four kinds of alum to configure two alum, three alum, or four alum quick setting waterproof agent. The setting speed of this waterproof agent generally does not exceed one minute. In engineering, its rapid setting effect and adhesion are used to mix into cement slurry, mortar or concrete for repairing, plugging, emergency repair and surface treatment. Due to rapid setting, it is not suitable to use cement waterproof mortar as a rigid waterproof layer of roof or ground

2. Configure heat-resistant mortar, heat-resistant concrete or acid resistant mortar, acid resistant concrete

with water glass as cementitious material, sodium fluosilicate as coagulant, and heat-resistant or acid resistant coarse and fine aggregates in a certain proportion. The ultimate service temperature of water glass heat-resistant concrete is below 1200 ℃. Sodium silicate acid resistant concrete is generally used for acid storage tank, acid pickling tank, acid resistant horizon and acid resistant equipment

3. Painting the surface of building materials can improve the impermeability and weathering resistance of materials

when soaking porous materials with water glass, its density and strength can be improved. It has good effects on clay bricks, silicate products, cement concrete, etc. However, it cannot be used to paint or impregnate gypsum products, because sodium silicate and calcium sulfate will react chemically to produce sodium sulfate, which crystallizes in the pores of the products and expands significantly, resulting in the destruction of the products

4. Reinforce the foundation and improve the bearing capacity of the foundation

inject liquid sodium silicate and calcium chloride solution into the stratum alternately, and the silicic acid gel generated by the reaction wraps the soil particles and fills their pores

silicic acid colloid is a kind of water absorbing and expanding frozen gel, which is often in an expanding state due to the absorption of groundwater, preventing the infiltration of water and consolidating the soil

5. Water glass can also be used as the raw material of a variety of architectural coatings

the liquid water glass and fire-resistant filler are mixed into a paste of fire-proof paint, which can be applied to the wood surface to resist the instantaneous flame and reduce the ignition point

summary: through the introduction of the above content, I believe that friends have a comprehensive understanding of sodium silicate. For more information, please continue to pay attention to Qijia information

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