Talc processing preferred SBE milling machine

With the development of the world and China’s economy, domestic and international demand for talc is growing. China is one of the world’s largest countries with talc reserves and production, and has a considerable industrial base.
Talc is mainly used in powder state, so the processing equipment for the fine grinding and ultrafine grinding, and select the appropriate grinding equipment for talc processing is essential. The MTW European talc mill and LUM ultrafine vertical talc mill produced by SBE are of high production efficiency and good finished product. The fineness of the product is 80-3250 mesh, which is suitable for the grinding of talc.
In addition to talc, SBE also offers limestone, kaolin, calcite, bentonite, barite, gypsum and other materials, grinding equipment, according to different application areas of the different requirements of fineness, SBE has a variety of models of milling equipment For the selection, LM vertical roller mill, MTW European version of the mill, TGM overpressure trapezium mill, LUM ultra-fine vertical mill, HGM ultra-fine ring roller mill, Continental coarse grinding and so on. Choose SBE mill to help you meet your challenge more easily.

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How gypsum powder is produced

SBE through hard exploration, painstaking research, in the 30 years experience in research and development of milling equipment, based on the durability of gypsum, water resistance, impermeability and other characteristics, the use of European version of the mill, vertical mill and other advanced equipment Configuration of the entire production line, the production line using DCS automatic control system, the real realization of automated production.
SBE configuration by the gypsum powder production line equipment performance, high production efficiency, product quality, supplemented by advanced dust collector, green. The main process is: crusher will be large-size gypsum ore broken into less than 30mm small pieces of particles, transported to the mill for grinding, the powder will be grinding to achieve the required fineness of the product gypsum powder Into the boiling furnace for calcination, unqualified material back to the mill to re-grinding until qualified. After calcination, the qualified gypsum powder is fed into the clinker storage or used in the workshop.

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Gypsum powder in different areas of application

The application of gypsum powder has a long history, and the early use is simple to use chalk, putty, tofu and handicrafts. It is widely used in construction, building materials, power plants, papermaking, paint, food, medicine and other fields.
China’s natural gypsum mineral resources, rich reserves, the total reserves of more than 60 billion tons, is the world’s largest gypsum manufacturing power. With China’s economic take-off to accelerate and increase the intensity of environmental protection, construction, building materials, power plant desulfurization requires a huge amount of gypsum powder. According to the different application areas of gypsum powder, gypsum powder production line can be divided into building gypsum production line and desulfurization gypsum production line.
Building gypsum production line (natural gypsum):
This type of gypsum powder production line using mature domestic advanced technology equipment, such as vertical mill, boiling furnace and so on. This gypsum production line is not only in full compliance with the national energy-saving emission reduction requirements, and easy to achieve automatic control. Gypsum powder product quality is good, the physical performance is stable, the production line operation expense is low, becomes the choice of our customers investment choice.
Desulfurization gypsum production line (power plant dedicated):
At present, the world’s most technologically mature desulfurization method is limestone-gypsum method. In order to improve the efficiency of flue gas desulfurization, the content and content of calcium oxide in limestone powder for desulfurization are higher in desulphurization process technology. SBE vertical grinding and European version grinding in the gypsum production line, the limestone, lime powder scale production is particularly applicable, is widely used in steel plants and thermal power plant desulfurization milling process, the desulfurization rate of 95% or more , The effect is remarkable.

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Performance advantages of Raymond Mill

Raymond Mill as the originator of the field of industrial milling, its performance has other types of grinding mill unparalleled advantages, mainly in the following areas:
First, the structure is simple. Raymond Mill is a three-dimensional structure, small footprint, strong system, from rough raw materials to the delivery to the powder and the final packaging, can be a separate production system.
Second, safe and reliable. Finished powder fineness uniformity, through the screen rate of 99%, which is difficult to have other milling equipment. Rotary device with a closed gear box and pulley, smooth transmission, reliable operation.
Third, easy to disassemble. The main tool holder is always in contact with the material during operation, so the blade holder is composed of two parts: the lower seat is disassembled and the connection bolt is easy to replace.
Fourth, easy maintenance. The use of electromagnetic vibration feeder to feed evenly, easy to adjust, small size, light weight, fuel-efficient power; electrical system using centralized control, milling workshop can be basically no homework, maintenance and easy maintenance.
Fifth, clean and clean. Dust pollution is small, low noise.

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Raymond Mill process

The whole structure of Raymond Mill is composed of main engine, analysis machine, pipeline device, blower, finished cyclone separator, jaw crusher, bucket elevator, electromagnetic vibration feeder, electric control motor and so on. Which Raymond mill host by the rack, into the volute volute, blade, roller, grinding ring, casing and motor components.
Raymond mill process (grinding process): large pieces of material by the jaw crusher to the required size, the hoist will be sent to the storage hopper material, and then by the vibration feeder evenly and continuously into the The host grinding room for grinding, grinding powder after the fan airflow away. By the analysis machine for grading, in line with the fineness of the powder with the air through the pipeline into the large whirlwind collector for separation and collection, and then discharged by the powder tube is finished powder.
The airflow generated during the grinding process is drawn into the blower by the upper end of the large cyclone collector. Due to the grinding material has a certain amount of water, grinding the heat generated when the grinding chamber gas evaporation to change the air flow, and the whole pipe connection is not tight so that the outside gas is sucked, so that the circulating air flow increases, And the host between the air duct to achieve the balance of airflow, and the excess gas into the small whirlwind collector, and the residual gas into the fine powder collected, and finally by the small whirlwind collector exhaust pipe row Into the atmosphere, or into the dust collector to purify the air. The airflow system of the Raymond Mill grinding process is closed and circulates in positive and negative pressure conditions.

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LM vertical mill

In the field of pulverized coal preparation, raw coal through crushing, drying, grinding to a certain degree of fineness, collected through the collector and stored in a dedicated coal for the next link burning or deep processing. One of the coal mill as a key equipment, a direct impact on the efficiency of pulverized coal preparation. Case studies have proved that SBE LM series of vertical coal mill is more suitable for China’s cement, coal processing and other industries, in the alternative foreign brands have a strong advantage, can be described as potential “type”:
1. Low investment costs. The system is simple, compact layout, covers an area of about 50% of the ball mill system, open air layout, a large number of lower investment costs.
2. Low operating costs (1) high milling efficiency: the use of roller in the disc directly crushed grinding materials, low energy consumption, and ball mill system compared to energy saving 30% to 40%. (2) wear less: because the work of the roller is not in direct contact with the disc, and roller and liner using high-quality materials, so long life, wear less.
3. Drying efficiency is high. From the outside into the mill within the hot air, in the mill directly, many times with the powder material in full contact, drying ability, for the mill system to save a dryer, saving energy, by adjusting the hot air temperature, To meet the requirements of different humidity materials.
4. Easy to operate, reliable operation. Equipped with automatic control system, can achieve remote control, easy to operate; equipped with a protective sleeve and disc liner to prevent direct contact with the limit device, to avoid the destructive impact and severe vibration.
5. Product quality and stability. As the material in the mill to stay a short time, easy to detect and control the product size and chemical composition, reduce the repeated milling, stable product quality; product iron content is very small, and contains mechanical wear iron easy to remove, for grinding white Or transparent material, the product of high whiteness and clarity.
6. Clean and clean. Vibration, low noise, and the overall equipment seal, the system under negative pressure, no dust spill, clean environment, to meet the national environmental requirements.

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Limestone gypsum flue gas desulfurization wet process

Environmental desulfurization process in the desulfurization agent mostly limestone powder, limestone powder quality, fineness and particle distribution is one of the key factors affecting the desulfurization effect, and select the appropriate limestone powder preparation process and equipment on the entire desulfurization process to An important role. Limestone – gypsum flue gas desulfurization wet process, is the world’s most mature technology, the most widely used control of SO2 emission technology, more than 90% of domestic thermal power plant using limestone – gypsum desulfurization.
Limestone – gypsum desulfurization works by adding limestone powder into the slurry as an absorbent pump into the absorption tower and full contact with the flue gas, sulfur dioxide in the flue gas and calcium carbonate in the slurry and the air from the lower part of the tower Oxidation reaction to produce calcium sulfate, calcium sulfate to a certain degree of saturation, the crystallization of dihydrate gypsum. The gypsum slurry discharged from the absorption tower is concentrated and dehydrated so that its moisture content is less than 10% and then transported to the gypsum silo by conveyor. The flue gas after desulfurization removes the droplets through the defogger and is heated by the heat exchanger After warming, the chimney into the atmosphere. As the absorber slurry through the circulating pump through the cycle of repeated contact with the flue gas, absorbent utilization is high, relatively low calcium and sulfur, desulfurization efficiency can be greater than 95%.
Limestone-gypsum desulfurization process is the desulfurization of flue gas after combustion, the absorption of SO2 medium is limestone powder, limestone powder particle size on the desulfurization efficiency has a greater impact, the smaller the particle size, the more conducive to the absorption of SO2, so The preparation of limestone powder has become a thermal power plant, steel desulfurization, improve the efficiency of desulfurization prerequisites. On the other hand, the preparation cost of limestone powder also has a great impact on the cost of desulfurization, low cost preparation of high fineness of limestone powder technology has become an important part of environmental desulfurization technology.

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Several Factors Affecting Desulfurization of Limestone

1, the quality of limestone
Usually, the weight percentage of calcium carbonate in limestone should be higher than 85%, the content is too low will be due to impurities to the operation to bring some problems, resulting in absorbent consumption and transportation costs increase, gypsum purity decreased. Limestone quality is determined by the CaO content, the higher the purity of limestone, the better the desulfurization efficiency. Limestone first grade calcium oxide content of 48% to 54%; limestone does not necessarily require the higher the better CaO content. CaO> 54% of the limestone, its high purity and marble, easy to grinding, chemical stability is also strong, it is not suitable for use as a desulfurizer.
2, the particle size of limestone (fineness)
The fineness of limestone powder is an important factor affecting the desulfurization efficiency. The contact area of the reaction determines the chemical reaction rate to a great extent. The finer the particle size of the limestone powder is, the greater the specific surface area is, and the contact area of the chemical reaction per unit mass The bigger ones. Since the dewaxing reaction of limestone is a solid-liquid two-phase reaction, the reaction rate is proportional to the specific surface area of the limestone particles. Therefore, the finer limestone particles have good dissolution performance, and the various reaction rates are higher, With the HSO3 in the slurry reaction, which more quickly absorb SO2 gas, desulfurization efficiency and high utilization of limestone.
3, the impact of limestone reactivity on FGD system performance
The properties of limestone as an absorbent include not only its chemical composition, but also its reactivity. The amount of alkali in the FGD system is provided by the dissolution of limestone powder. The activity of the absorbent affects the solubility and dissolution rate of the absorbent. The transformation characteristics in the acidic environment. The activity of the absorbent comprises the type of the absorbent, the physicochemical properties and the acidic environment in which it reacts. The physicochemical properties of the absorber include purity, crystal structure, impurity content, particle size distribution, total unit area and particle density including the inner surface (i.e., porosity). The higher activity of limestone in the same limestone utilization to maintain the case, you can achieve higher SO2 removal efficiency. Limestone reactivity is high, limestone utilization is also high, gypsum excess CaC03 content is low, that is, high purity gypsum.

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Limestone powder production process

Limestone is a common non-metallic mineral, the main component of calcium carbonate. Limestone powder production process is the processing of calcium carbonate powder, the current name of calcium carbonate products more, and according to the different processing methods can be divided into heavy calcium carbonate, light calcium carbonate and nano-calcium carbonate. Light calcium carbonate than the heavy calcium carbonate production process long, waste emissions, emissions, energy consumption; and heavy calcium on the ore requirements are higher, but less pollution and energy consumption. Because of the environmental protection and energy saving characteristics of TSP, in recent years has been focusing on the development of domestic and foreign technology.
Heavy calcium carbonate production methods are two: dry powder production process and wet production process.
Dry powder production process: the first quarry of the limestone transported to the crusher with crushing, and then the mill will be crushed material after grinding fine limestone powder, and finally with a sieve on the grinding of limestone powder Grading, in line with the requirements of the powder as the finished product packaging storage, does not meet the fineness requirements are required to return to the mill again grinding. The use of dry production process generally can only produce ordinary heavy calcium carbonate, for ultra-fine heavy calcium carbonate, technically feasible but the production cost is too high, the economy is not feasible, so superfine heavy calcium carbonate is generally wet Production process to produce.
Wet production process: the first dry powder produced by the fine powder into the mill into the mill to further crush, dehydration, drying can be made after the superfine heavy calcium carbonate, wet production process in addition to the equipment Requires a high outside also need a good grinding aids and grinding media.

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Tricyclic powder mill

Three-ring micro-grinding is a fine powder and ultra-fine powder processing equipment, the ultra-fine grinding equipment is mainly applied to the processing of Mohs hardness less than 6 non-flammable and explosive brittle materials such as calcite, limestone, kaolin, bentonite, talc , Pyrophyllite, diatomite, barite, gypsum, graphite, potassium ore, pumice and other 200 kinds of materials, finished grain size in 325-2500 mesh (0.044-0.005mm).
The three-ring micro-grinding, produced by SBE, also known as HGM medium-speed pulverizer, is based on the Swedish advanced grinding technology, based on the domestic demand for ultra-fine powder processing and milling industry development trend of a developed New ultrafine grinding machine. HGM tricyclic powder mill full set of configuration include: crusher, bucket elevator, storage silo, electromagnetic vibration feeder, micro-grinding host, separator, diffusion double whirlpool collector, pulse dust collector, High pressure fan, dust collector and so on.
The advantages of tricyclic medium-speed micro-grinding are mainly reflected in:
1, safe and stable operation. Medium-speed micro-grinding compared with the ordinary mill, the grinding chamber without rolling bearings, no screws, so there is no bearing and other seals vulnerable to the problem, to avoid the loose loosening of the machine and damage the machine, grinding cavity safe and reliable operation The
2, environmental pollution. In the speed of the use of efficient pulse dust collector, the entire process of operation of equipment without dust pollution. Configuration of the silencer and silence room, reducing the noise, in full accordance with the national environmental standards to organize production, played a role in environmental protection.
3, low loss of wearing parts. All the wearing parts of the medium-speed mill are made of high-quality wear-resistant materials at home and abroad, and the service life of the wearing parts is higher than that of the ordinary mill.
4, finished fineness high. Micro-grinding with graded grinding, finished fineness is high, the final fineness of a one-time can reach d97 ≤ 5μm.
5, low investment costs In the case of the fineness of the finished product, the medium-speed micro-grinding is 45% higher than the grinding and stirring of the airflow, the investment cost is low and the recovery period is short.

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