The coal mine dust influence the safety of mine production, threatening the health of workers, it is one of the five major coal mind disasters.
Effective control of dust, dust concentration, improve the working environment, prevent dust accident, is an important link in coal mine production safety.
Coal production has developed rapidly in recent years, the level of mechanization has greatly improved, coal mine will produce large amounts of dust in tunneling, mining, transportation, safety production and the staff seriously threatens the mine health. Effective control of dust, dust concentration, improve the working environment, prevent dust accident, is an important link in coal mine production safety, grasp the Comprehensive Dustproof mine work, to promote mine safety production, is of great significance to protect the health of workers.
Coal mine dust is produced in the exploitation of coal mine, digging, mining and hoisting process, and long time suspended in the air in the rock and coal fine particles of dust, also referred to as.
Hazard of coal dust is mainly manifested in four aspects:
Coal spontaneous combustion and explosion, coal dust explosion risk exists generally, serious harm. Widespread China coal mine explosion in 2007, state-owned key coal mine 548 mine coal dust explosion hazard, accounted for 87.4%.
Serious occupational hazards. According to statistics, at present only the coal industry of pneumoconiosis patients have more than 200000, close to half of all industries in China Lung number, and each year is still growing, every year because of pneumoconiosis death in 2500 to 3000.
Reduce the visibility in the workplace. Under certain working face coal dust concentration is high, the visibility is very low, often lead to misoperation, increased incidence of industrial accidents.
Accelerating mechanical wear mine dust effects on mechanical equipment. In the accelerated wear machinery, precision instruments, life can. Control coal dust hazard has become the coal industry the most important things, and to control dust hazard, the most effective measure is to greatly reduce the dust concentration in the air of workplace.
Properties of polyvinyl alcohol and its degree of polymerization and alcoholysis degree are close to correlation and determines of the nature of its application. Conventional varieties due to the existence of defects in the heat resistant polyvinyl alcohol, water resistance, creep resistance and so on, affect the scope of its application. Generally speaking, the lower the degree of alcoholysis of polyvinyl alcohol molecules, remaining vinegar acid is higher, its surface activity and dispersing property is better; the degree of polymerization and alcoholysis of polyvinyl alcohol dissolved in the lower, the better the water; degree of polymerization and alcoholysis degree is low, the better the performance of PVA biodegradation.
The difference of polyvinyl alcohol polyvinyl alcohol 0588 belongs to a low degree of polymerization, partial alcoholysis type, the equivalent of a hydrophobic monomer vinyl acetate copolymer modified polyvinyl alcohol.
Polyvinyl alcohol 0588 has excellent surface activity, can be used for PVAc, VAE emulsion, VAc emulsion polymerization of vinyl chloride suspension polymerization of emulsifier, dispersant. According to statistics, in 2003 China's PVC production reached 4000000 tons, while more than 80% of the suspension polymerization process. In the suspension polymerization of vinyl chloride, dispersing agent for polyvinyl alcohol 0588, each year about 5000 to 8000 tons, basically rely on imports.
In addition, because the safety tests showed that the PVA is of low toxicity, non irritating, Japan and other countries American is already approved for use in medicine and food industry.
Currently used in the pharmaceutical industry of polyvinyl alcohol is mainly PVA0588 and PVA1788. The molecular weight of PVA0588, PVA were superior in moisture absorption, water soluble and flexibility of other types of film, widely used in traditional Chinese medicine, can be used as coating film material, filming agent film forming material, gel preparation of matrix materials and so on. Taking PVA 0588 as film-forming materials Pseudolarix coating agent, preparation of stable properties, applied to the skin can quickly into the film, film is not easy to fall off, and the PVA can be directly with the traditional Chinese medicine extracts mixed in any proportion. Taking PVA0588 as membrane material points with cough coating agent has antitussive, antiasthmatic, obviously, to overcome the traditional oral dosage big, long course of treatment and side effect big shortcoming, it opens a new way for external treatment for internal diseases.
Therefore, study on the synthesis of PVA 0588, broaden the application field of polyvinyl alcohol polyvinyl alcohol industry in China, to speed up the adjustment of product structure, has a very important practical significance to realize the sustainable development.
1. Passivation membrane type corrosion inhibitor:
Such inhibitors are oxidant, the metal surface oxidation generating a layer of continuous and compact containing gamma -Fe2O3 with anti-corrosion function of passivation film, can be spread in the adjacent zone and achieve the goal of the corrosion. Typical is the chromate, nitrite. But because of the toxicity has two basic no, only the nitrite for closed circulating cooling water, replace sb. is
Molybdate, Tungstate and Tungsten Heteropoly Acid. This kind of corrosion inhibitor are often large amount, because if the amount is not enough, not enough to make the anode passivation is all, corrosion will be concentrated in unpassivated complete parts, causing dangerous pitting.
2.
Precipitation membrane type corrosion inhibitor:
Membrane type inhibitor is with ion reaction medium in the formation of precipitation, membrane on the metal surface. Although the precipitation film thickness ratio of the film thickness, but dense, adhesion is poor, so the corrosion effect is not as good as the passivation film, but because of the amount of corrosion inhibitor was small and the price is cheap, it should be used with especially on research and application of phosphorus corrosion inhibitor is most active. Such as: MBT,
BTA and
TTA and so on.
3. The adsorption film type corrosion inhibitor:
The class are organic compounds, the molecular structure containing both adsorption and hydrophobic group, in directed metal surface adsorption group, hydrophobic group to form a layer of shielding or barrier layer in the periphery, the metal surface and metal ions and dissolved oxygen isolation, inhibited the corrosion of metals. When cleaning the metal surface is active, the adsorbed films exhibit a corrosion prevention effect is good, but if the metal surface corrosion products covered or deposit, to provide appropriate conditions cannot form corrosion film.
4. Compound corrosion inhibitor:
At present, because of the various series of corrosion defects inhibitor itself, so its application is limited, in order to better inhibition effect is obtained, the synergy principle, both at home and abroad, and has been widely used in corrosion composite corrosion inhibitor in water treatment to control equipment.
Now, the whole organic formula because of no pollution, no hydrolysis of poly P, no risk of calcium phosphate scale, water quality suitable for high PH, high alkalinity, high hardness and high concentration ratio, it is applied widely.
Polyvinyl Alcohol (PVA) is the hydrolysis of Polyvinyl Acetate, it has excellent performance membrane film, colorless transparent, oil resistance, solvent resistance, bacteria and fluorescent stability and many other properties. As the film production process, the following features must cause enough attention.
1. The
PVA solvent is water, but its water solubility is greatly affected by the degree of polymerization of influence, especially controlled by the alcoholysis degree. Complete alcoholysis PVA dissolved in the minimal water, when the degree of alcoholysis is under 88 %, and when the temperature is under 20 ℃, it almost completely dissolved, but with the rise of the alcoholsis degree, the solubility of it is reduce greatly.
2. The viscosity of high degree of alcoholysis of
Polyvinyl Alcohol water solution change by the different placing conditions, and the storage temperature directly affect the viscosity. Experiments show that when the temperature is between 20 to 50 ℃, the viscosity decrease a lot, and when the temperature is at 50 ℃, the decrease of viscosity is smaller, and when the temperature is more than 80 ℃, the viscosity is stable.
The viscosity of PVA solution increases with the increase of the concentration of PVA. The surface of PVA solution crusts easily under stationary state, the crust phenomenon on the coating is extremely unfavorable.
3.
PVA film has excellent oxygen barrier properties in dry conditions, oxygen permeation coefficient of it is the lowest in all kinds of resin film. The existence of a large number of hydroxyl (OH) groups on the molecular chain of PVA, in a wet environment, these hydroxyl groups and water molecules form hydrogen bonds, leading to PVA aggregation structure changes, the barrier property of PVA greatly decreased. And with the rise of relative humidity the amount of oxygen through also increase significantly.
4. PVA film in water has the phenomenon of swelling and shedding, if the composite coating film exposed in the moist environment, the high oxygen barrier property will be lost.
Shengli Chemical Co. LTD is [URL=http://www.shenglichemical.com/Products.htm]a subsidiary of Yihua Chemical Co., LTD[/URL], it is the biggest manufacturer of producing copper chloride, nickel chloride, nickel sulphate and cobalt chloride in China. Shengli Chemical Co. LTD is located at Zhangjiagang, which is 150 km (90 miles) away from Shanghai and 80 km (50 miles) from Suzhou.Zhangjiagang Port, one of the most important ports of transportation is very convenient and especially, east China is only 20 km (12 miles) away.
Copper chloride dihydrate is the chemical compound with the formula CuCl2. This is a light brown solid, which slowly absorbs moisture to form a blue-green dihydrate. The copper(II) chlorides are some of the most common copper(II) compounds, after copper sulfate. Copper Chloride is mainly used in creating blue flame displays, photography, electroplating baths, fungicides, pigment for glass and ceramics, mordant in dyeing and printing fabrics. Nickel chloride is used by diverse industries such as chemical, pharmaceutical, drug and in several chemical reactions, our nickel chloride hexahydrate is pure in composition and remains stable under various conditions. Nickel sulphate is often used as activator of plate, cirrhosis oil, dying agent todeoxidizing, activatro to oxidating Citrin third. And cobalt chloride is used in electronic element, battery and magnetism material industry as well as in enamelware painting, catalyst and nickel salt.
We have the stable and abundant supply of goods. We can guarantee the quality of our products. Our management is in good faith, we can realize the connection between the product and the international. We provide technical support and the whole solution of the product service. And furthermore we have abundant series of supply can fully meet your requirements. We always focus on the needs of our customers. We will provide high quality chemical products, service customers in the round, improve service quality through prove the professional level and unremitting efforts. Excellent staff, advanced technology, excellent equipment and the strict management is the essence of the company’s continuous development. We are still expanding our production line to seek further development and get more market share. We have the special and technical grade products can all be provided. Sticking to the philosophy of "quality first, clients supreme", we have successfully provided our excellent services and products to both domestic and international customers in the past two decades. Welcome new and existing clients to visit our company and wish we would become friends and cooperative partners, creating brilliant future together.
If you have the demand for copper, nickel and cobalt series products, please contact us:
Add: Jiyang Middle Road, Zhangjiagang, Jiangsu Province, China
Tel: 0086-25-52397808
Fax: 0086-25-68650010
E-mail: info@shenglichemical.com
Website: www.shenglichemical.com
Yihua Chemical Co., LTD was established in 2000, and located in Yangze Delta. It is a private company specialized in the production and exportation of cobalt salt, nickel salt and copper salt.
Cobalt is a chemical element with symbol Co and atomic number 27. Cobalt is found naturally only in chemically combined form. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal.Cobalt is used in the preparation of magnetic, wear-resistant and high-strength alloys. Cobalt silicate and cobalt(II) aluminate (CoAl2O4, cobalt blue) give a distinctive deep blue color to glass, smalt, ceramics, inks, paints and varnishes.
Nickel is found as a constituent in most meteorites and often serves as one of the criteria for distinguishing a meteorite from other minerals. Iron meteorites, or siderites, may contain iron alloyed with from 5 to nearly 20% nickel. Nickelis a silvery white metal that takes on a high polish. Nickel is hard, malleable, ductile, somewhat ferromagnetic, and a fair conductor of heat and electricity.
Copper is one of the basic chemical elements with symbol Cu (cuprum). Copper is reddish-orange metal known for its high thermal and electrical conductivity. Pure copper is rather soft and malleable and (when fresh) has a pinkish or peachy color, which (besides gold and caesium) is unsual for metals, which are usually silvery or grayish.
We have the stable and abundant supply of goods. We can guarantee the quality of our products. Our management is in good faith, we can realize the connection between the product and the international. We provide technical support and the whole solution of the product service. And furthermore we have abundant series of supply can fully meet your requirements. We always focus on the needs of our customers. We will provide high quality chemical products, service customers in the round, improve service quality through prove the professional level and unremitting efforts. Excellent staff, advanced technology, excellent equipment and the strict management is the essence of the company’s continuous development. We are still expanding our production line to seek further development and get more market share.
If you have the demand for cobalt, nickel and copper series products, please contact us:
Tel: 0086-025-52397808
Fax: 0086-025-68650010
Email: info@cobalt-nickel.net
Website: www.cobalt-nickel.net
Add: Changan East Road 150#, Yangshe Town, China
1. Accidental emergency treatment
Leak contaminated areas evacuated personnel to a safe area, not to prohibit access to the contaminated area, cut off the source of fire. Recommended emergency personnel wearing self -contained breathing apparatus to wear chemical protective clothing. Do not direct contact with leakage, in ensuring the safety of plugging. Use sand or other absorbent non-flammable mixture absorption, then collect and transport the waste to disposal sites. You can also sprinkle ground soda ash, with plenty of water rinse, diluted Add Water Wastewater System. If a large number of leakage, the use of cofferdam asylum, and then collect, transfer, recycling and harmless treatment after the waste.
2. Protective measures
Respiratory protection: concentration in air overweight, they should wear protective masks. Emergency rescue or evacuation, it is recommended to wear self- contained breathing apparatus. Eye protection: Wear protective chemical safety glasses.
Protective clothing: wearing overalls ( anti-corrosion material ).
Hand protection: Wear rubber gloves.
Others: work , take a shower. Attention to personal hygiene.
3. First aid measures:
Skin contact: Remove contaminated clothing, immediately flush with water for at least 15 minutes. If it burns, medical care treatment.
Eye contact: immediately filed eyelid, mobile or saline irrigation water for at least 15 minutes. Seek medical advice.
Inhalation: rapidly from the scene to fresh air. Keep the airway patency. Difficult to breathe oxygen. Give 2-4 % sodium bicarbonate solution inhalation. Seek medical advice.
Fresh into: coverage immediately mouthwash, or egg white to the blues. Get medical attention immediately.
Fire fighting methods : mist of water, sand, foam, carbon dioxide.
Where to buy the formic acid with good price?
Zhongshan Industry Co. ltd is the formic acid manufacturer in China. We can provide industrial grade of formic acid which is well-sold all over the world. We can guarantee the quality of our products. Our management is sincerity, realize the connection between the product and the international. We provide technical support and the whole solution of the product service. And furthermore we have abundant series of supply can fully meet your requirements.
If you have a demand for formic acid or related products, please contact us:
Tel: 0086-25-52397808
Fax: 0086-25-68650010
E-mail: info@formic-acid.net
Website: www.formic-acid.net
