The purpose of the sodium silicate is introduced

The purpose of the sodium silicate is very broad, almost throughout the various sectors of the national economy. In chemical systems are used to produce silica gel, white carbon black, zeolite molecular sieves, five water sodium metasilicate, silica sol, the layer of silicon and instant powdered sodium silicate, potassium sodium silicate and other silicate products, is a basic raw material of silicon compounds. In the economic developed countries to sodium silicate as the raw material of deep processing series of products has grown to more than 50 kinds, some have been used in the field of science and technology of high, refined, sharp; Is detergent washing powder, soap, etc. In the light industry in the indispensable raw materials, is also a water softener, settling agent; In the textile industry for assisted dyeing, bleaching and sizing; In the machinery industry are widely used in casting, grinding wheel manufacturing and metal preservatives, etc.; In the construction industry used in the manufacture of alumina cement, acid-resistant cement waterproof oil, soil stabilizer, refractory materials, etc.; Can be made of silicon fertilizer in agriculture; Also used as oil catalytic cracking of silica alumina catalyst packing, corrugated paper, adhesive, soap, laboratory crucible, high temperature resistant material, metal preservatives, water softeners, detergent additives, refractory and ceramic raw materials, textile bleaching, dyeing, and pulp, mining beneficiation, waterproof, plugging, wood fire, food preservative and adhesive, etc.

Points above are as follows:

Improve the ability of resistance to weathering

Sodium silicate solution after brushing or impregnating material, can penetrate into cracks and pores, silicone gel to curing blocking pore channels, increase the density and strength, so as to improve the weathering resistance of the material. But shall not be used to besmear to brush or sodium silicate impregnated gypsum products. Because of sodium silicate and gypsum reacts sodium sulfate (Na2SO4), in the products within the pore crystallization, result in the crack of the gypsum products.

Reinforced soil

Soil in the alternating injection of sodium silicate and calcium chloride solution of two solution to react quickly to produce the silica gel and calcium silicate gel, have the effect of cementing and pore filling, increase the strength and bearing capacity of soil. Commonly used in powder and fill soil, sandy soil foundation reinforcement, called double liquid grouting.

Preparation quick-setting waterproofing agent

Sodium silicate mixture quick-setting agent with a variety of alum, used for plugging, caulking and other local repair. Such vitriol waterproofing agent of condensate fast, generally for a few minutes, four of the alum waterproofing agent less than 1 min, so the site must do when using the distribution box.

More alum waterproofing agent commonly used bluestone (copper), red alum (potassium dichromate, K2Cr2O7), alum (also called alum and aluminium potassium sulfate), purple alum and so on four kind of alum.

Mixed acid gelling

Acid gel is a glass with water and acid powder made from common quartz powder (). Like acid-proof mortar and concrete, there is a requirement for acid is mainly used in engineering. Such as sulfuric acid pool, etc.

Preparation of heat resistant mortar

Sodium silicate gel is mainly used for masonry of refractory materials and repair. Sodium silicate refractory mortar and concrete is mainly used for blast furnace base there is a requirement for heat and other structural parts.

Anticorrosion engineering application

Modified sodium silicate acid and mud acid corrosion is important material, main characteristic is acid and heat-resistant, dense permeability, low cost, easy to use. Can be mixing into acid-proof daub, acid-proof mortar and acid proof concrete, suitable for chemical industry, metallurgy, electric power, coal, textile and other departments of various structure anti-corrosion engineering, building structure is spinning acid, acid for acid pools floor, acid and surface masonry ideal material.

The binder

S widely used sodium silicate co2 blowing process, the process for the amount of sodium silicate is high, the breakup sex difference, sand can't reuse, waste silica sand resources, a large number of discharge of solid waste, destroy the ecological environment, production casting quality is rough, so that it is facing elimination.

Ester hardening sodium silicate self-hardening sand came out in 1999, the new 1.8 ~ 3.0% for the amount of sodium silicate, high strength, good pieces, sand renewable reuse, back powerusageeffectiveness 80 ~ 90%, can use time is adjustable, can be used in the mechanized production line modelling, also can be used for sheet small batch production. It can produce a few kilograms to hundreds of tons of all kinds of castings, is now in the railway vehicle, metallurgical machinery, heavy machinery, mining machinery, general machinery factory dozens of enterprise application.

New type of sodium silicate is called conforms to the sustainable development of green environmental protection casting binder.

The main features high cohesive force

The main components in sodium silicate hardened and solid silica gel, specific surface area is large, thus has the high cohesive force. But the quality sodium silicate itself, to match the performance of the material and construction maintenance has a significant effect on strength.

Good resistance to acid

Can resist except hydrofluoric acid (HF), thermal phosphoric acid and senior fatty acid almost all outside of inorganic and organic acids.

Good heat resistance

Silica mesh skeleton is formed after hardening, strength at high temperature is very small, when using heat resistant refractory aggregate preparation sodium silicate cement mortar and concrete, the thermal stability of up to 1000 ℃. So the heat resistance of sodium silicate concrete, can also be interpreted as mainly depends on the thermal stability of aggregate.

Alkali resistance and water resistance is poor

Because and blend to easily soluble in alkali, the water cannot be used in alkaline environment. Also because of NaF, Na2CO3 are soluble in water and not water resistant, but can use medium concentration of acid in the hardened waterglass pickling processing, improve the water resistance.

Basic knowledge of relevant knowledge sodium silicate

The commonly used sodium silicate divided into two categories, potassium sodium silicate and sodium silicate, commonly known as paohuajian. Sodium silicate aqueous solution of sodium silicate, the formula for the Na2O nSiO2. Potassium sodium silicate as the potassium silicate aqueous solution, the molecular formula for K2O nSiO2. The main use of sodium silicate in civil engineering. When the engineering technical requirements higher potassium sodium silicate may be adopted. High quality pure sodium silicate as colorless transparent viscous liquid, soluble in water. Pale yellow or green gray when containing impurities.

The m is called the modulus of sodium silicate, sodium silicate formula is represent the Na2O and SiO2 mole ratio, is a very important parameter. The greater the value of n, the higher the viscosity of the sodium silicate, but the loss of dissolved in water. When n is greater than 3.0, can only be dissolved in hot water, bring trouble to use. The smaller the value of n, the lower the viscosity of sodium silicate, the more soluble in water. Is commonly used in civil engineering modulus n is 2.6 ~ 2.8, is soluble in water and has a higher strength.

The production of sodium silicate module generally between 2.4 ~ 3.3. Content in aqueous solution of sodium silicate (or concentration) commonly used density or the baume degree said. In civil engineering; the density of water glass is 1.36 ~ 1.50 g/cm after commonly, equivalent to the baume degree 38.4 ~ 48.3. The greater the density, the higher the content of sodium silicate, the greater the viscosity.

Sodium silicate usually using quartz powder (SiO2) combined with soda ash Na2CO3 (), under the high temperature of 1300 ~ 1400 ℃ calcination generated liquid sodium silicate, flowed from furnace discharging mouth, block or water quench into particles. Dissolve again in the high temperature or high temperature and high pressure water, the obtained solution of sodium silicate products.

Condensation curing of sodium silicate

Sodium silicate in the air condensation curing is very similar with lime condensation curing, mainly through carbonization and dehydration two crystallization consolidation process.

As the carbonization reaction of silica gel content increased, the free moisture to evaporate and silica gel dehydration into solid and condense sclerosis, its features are:

1. The speed is slow. Due to the low CO2 concentration in the air, so the carbonation reaction and the condensation curing process is very slow.

2. Volume contraction.

3. Low intensity.

To speed up the process of condensation water, curing speed and improving strength: sodium silicate general requirements when using add hardener fluorine sodium silicate, formula for Na2SiF6.

Fluorine content of sodium silicate is commonly 12% ~ 15%. Less dosage, condensation curing slow, and the intensity is low; Content is too much, then condense sclerosis too fast, inconvenient operation, and early strength after hardening is high, but the late strength is decreased obviously. Therefore, when using, should strictly control the dosage of curing agent, and according to the temperature, humidity, sodium silicate, the modulus and density within the scope of the appropriate adjustments. Namely: high temperature, large modulus and density of hours to choose lower limit, and vice versa.

Instant powder

Instant powdered sodium silicate, also known as instant paohuajian, hydrated sodium silicate. This product appearance white, powder, good uniformity. Transport, storage and use is very convenient, especially suitable for mechanization and automation. Widely used in metallurgy, electric power, petrochemical, building materials industry. Used as a binder of monolithic refractories, industrial cleaning agents, preservatives, in soap and acid-resistant cement, fine ceramic industry and precise casting industry fast drying agent and strengthening agent, etc. Instant powdered sodium silicate products also have liquid paohuajian has all the properties and application. Instant powdered sodium silicate formula Na2O mSiO2 · nH2O, type quantity generally between 280 ~ 350. Compared with the anhydrous sodium silicate in powder through mechanical crushing, the former has many valuable properties, such as water soluble rate, purity, etc. Instant powdered sodium silicate are fine chemical products, the department of dry (glauber's salt, soda ash) paohuajian after material, filtering, mould, spray drying process.

Dangerous health hazard

Inhalation of the product vapor or mist can irritate the respiratory tract mucous membrane and corrosive, may cause chemical pneumonia. Liquid or fog cross-eyed strong excitant, can cause conjunctiva and corneal ulcer. Skin contact with liquid can cause dermatitis or burns. Intake of liquid corrosion of the digestive tract, nausea, vomiting, headache, weakness and renal damage.

Combustion hazard

Non-combustible, corrosive, strong excitant, can cause the human body burns.

Handle emergency measures

Skin contact: remove contaminated clothing and immediately with plenty of liquid water washing at least 15 minutes. Go to a doctor.

Eye contact: immediately filed a eyelid, with plenty of liquid water or saline thoroughly flushed at least 15 minutes. Go to a doctor.

Inhalation: quickly from the scene to fresh air. Keep respiratory tract unobstructed. Such as difficulty in breathing, give oxygen. If breathing stops, artificial respiration immediately. Go to a doctor.

Eat: water gargle, to drink milk or egg white. Go to a doctor.

Fire control measures

The special burning explosion dangerous features: no features.

Hazardous combustion products: silica.

Extinguishing method: non-combustible. Firemen must wear filter type gas mask (full-face) or isolation respirator, worn a fire protective clothing, in the direction of the wind fire. Remove the container from fire to open as much as possible. Water keep fire containers cooling, until the end of fire. Cut off the gas source quickly and then choose the proper fire extinguishing agent according to the fire reason.

Leak emergency treatment

Leave quickly leak contaminated area personnel to safe areas, and in isolation, restricted access. Recommended emergency personnel wearing self positive pressure respirator, wear protective clothing. Cut off the leak source as possible. If it is a liquid. A small leak: with plenty of water to rinse, wash water diluted into the wastewater system. A large number of leak: constructing dike to dig a hole or asylum. Pump to tank lorry or dedicated collector, recycling or shipped to the disposal of waste places. If it is solid, with clean shovel collected in dry, clean, covered container. If a large number of leaks, collecting recycling or shipped to the disposal of waste places.

Industry: sodium silicate products belong to inorganic salt manufacturing