The desulfurization mill mainly uses a mill to process the desulfurizer, that is, limestone. The fineness of the limestone fine powder generally used in desulfurization of power plants and steel plants is 300 mesh. Of course, many enterprises are enterprises that produce high-quality desulfurizers. Generally, the fineness of the limestone fine powder is as high as 600 mesh, and even the amount of the desulfurizing agent required to be produced by some enterprises reaches 800 mesh. In industrial applications, the application range of 300 mesh limestone desulfurizer micropowder is relatively wide and the dosage is relatively large. Therefore, in actual production, the application rate of Raymond mill is relatively high, but from the structure of Raymond mill, processing The limestone desulfurizer that comes out can only reach 300-400 mesh, and the pass rate is not high. Let us look at the differences and main applications of wet mills and dry mills in the processing of limestone desulfurizers.
Wet mill refers to the equipment that is slowly processed under the action of water flow. The fineness of the ore powder processed by the wet mill is up to tens of thousands of mesh. The main principle is to use water flow. The fine powder is derived, which is equivalent to the sedimentation process we have said, like the slaked lime used in our construction. The limestone fine powder processed by the wet mill must be dried in the dryer before it can be used in industrial production. Therefore, there are actually more equipments to be invested, and the process flow is more complicated. It is applied in actual limestone desulfurization. Sex is not very big.
The dry mill is mainly based on the principle of mechanical grinding. The limestone is directly placed in the mill for grinding to obtain limestone fine powder. The fineness of limestone fine powder processed by the industrial dry mill is used. It can be up to 3000 mesh. Although it can't compare with the fineness of the wet mill, it is more than enough for the production of desulfurized lime. The fineness can be adjusted from 300-3000 mesh, which is enough to meet the needs of most enterprises. The biggest advantage of the dry mill is that it can be directly applied to the production of desulfurized stone powder, and the finished product can also be directly used in the desulfurizer of the steel plant power plant, which greatly simplifies the operation process and saves the cost of equipment investment. From the role of wet mills and dry mills in the production of limestone desulfurizers, it can be seen that the use of dry mills in the production of desulfurizers is much better than wet mills.
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Ground Calcium Carbonate(GCC) is usually got by grinding natural carbonate minerals such as calcite, marble and limestone. It is a kind of common powdery inorganic fillers, characterized by high purity, big inertia and excellent thermal stability. GCC never decomposes below 400. Besides, it has advantages such as high whiteness, low oil absorption, low refractive index, low hardness, low abrasion value and good dispersion. GCC is soft, dry / water-free, non-toxic, tasteless and odorless. In terms of granularity, GCC can be classified into ordinary GCC, ultrafine GCC, wet-grinding ultrafine GCC and surface-modified ultrafine GCC.
Ground Calcium Carbonate(GCC) is usually made by grinding natural carbonate minerals such as calcite, marble and limestone. It can be got by wet or dry process. Currently, dry process is popular at home.
Usually, LM vertical grinding mill, MTW European grinding mill and MTM over-pressure trapezoidal grinding mill are often used for fine powder processing while LUM ultrafine vertical grinding mill and SCM ultrafine grinding mill are often used for ultrafine grinding.
With air flow, powder meeting the standard enters into the powder collecting system along the pipe. The finished powder products are sent to finished product warehouse by conveyor and packed by powder filling tanker and automatic pack machine.
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The focus of the calcium carbonate industry is changing. Demand and production levels are rising in Asia as the more traditional markets of Europe and North America face their own challenges. Asia is now the fastest growing regional market for ground calcium carbonate (GCC) and precipitated calcium carbonate (PCC), mainly driven by the expansion in the Chinese paper and plastics sectors. According to the latest report from Roskill, in total, the region consumed almost half of the GCC and PCC global demand of 74Mt in 2011, with China alone taking over 20%.
The use of calcium carbonate by the paper industry has grown significantly in recent years, in part reflecting an overall increase in paper production. Paper output in Asia rose by nearly 6%py over the past decade aided by the construction of new large scale paper mills. Demand for GCC and PCC also grew because of increased mineral loadings in paper to reduce consumption of more expensive pulp and to meet the rising demand for high-brightness paper.
The plastics industry is the second largest market for calcium carbonate and the Asian region leads the world in terms of consumption. Roskill estimates that just under 60% of global GCC consumption in plastics is in Asia and for PCC, this share is even higher at over 85%. These figures reflect the increasing concentration of the plastics industry in Asia and the fact that PCC has been used in the Chinese industry for far longer than GCC.
Both minerals are widely used as fillers in rigid PVC, which is produced in large amounts (over 36Mt in 2010) and often has high mineral loadings. Growth in PVC demand in industrialised countries was adversely affected by the recession in the construction industry in the late 2000s. Chinese PVC production, however, has risen by an average of 17%py over the last decade and by 2010, Chinese companies accounted for over 40% of world PVC capacity.
Global combined capacity for GCC and PCC is over 100Mtpy. GCC capacity is estimated to exceed over 80Mtpy and located in 70 countries, reflecting the wide availability of marble and limestone raw materials. Capacity exceeds 2Mtpy in only eight countries and is highest in China (20Mtpy) and the USA (>14Mtpy), followed by Spain (3.7Mtpy) and Norway (3.2Mtpy). PCC capacity is more concentrated than that of GCC on a national level, with the total PCC capacity identified by Roskill as over 17Mtpy, with China accounting for nearly half and the USA for a further 17%.
The calcium carbonate industry is characterised by a few multinational producers and thousands of often very small producers. Twelve companies control around half of global GCC and PCC capacity. The three leading producers (Omya, Imerys and MTI) together holding over 40% of GCC capacity and 35% of PCC capacity.
Growth in GCC and PCC output in recent years has been led by China. GCC production did not start in China until the 1990s but its share of global calcium carbonate output is forecast to rise to over 70% in the next few years. Combined production of GCC and PCC in China grew by 7%py between 2008 and 2011, equally divided between the two forms. Much of the recent increase in output was of dry ground calcium carbonate (DGCC), which is used in plastics. Over the last decade, a number of very large paper mills have come on-stream between Anqing and Shanghai that have satellite wet ground calcium carbonate (WGCC) plants based on marble feedstock from local deposits.
Overall world demand for GCC and PCC is forecast to rise by just over 3%py from 74Mt in 2011 to 90Mt in 2016. Continuing the pattern seen over the past few years, growth in terms of geographical area will be led by Asia. By 2016, Asia is projected to account for 52% of the forecast world total consumption compared with 48% in 2011.
Growth in terms of end use markets will still be led by the paper and plastics industries. The paper industry will remain the leading market for both forms of calcium carbonate through to 2016. Growth in this market is forecast at 3.1%py, with strong growth in Asia, driven by rising paper production and higher filler loadings. This will be partially offset by lower growth in industrialised countries where there is surplus papermaking capacity and rising use of digital media. Growth in PCC demand is likely to be slightly higher than for GCC.
In the plastics industry, growth in combined world demand for GCC and PCC is projected to rise at nearly 5%py through to 2016. Nearly 80% of additional demand through to 2016 will be located in Asia, mainly in China where over 10Mtpy of new PVC capacity is planned to come on-stream over the next few years. By 2016, China and India are together estimated to account for more than 45% of world PVC demand.
Ground and Precipitated Calcium Carbonate: Global industry markets and outlook, 1st Edition, 2012 is available at 3500 / US$5800 / 4600 from Roskill Information Services Ltd, 54 Russell Road, London SW19 1QL ENGLAND. Tel: +44-20-8417-0087. Fax +44-20-8417-1308 Email: [emailprotected] Web: http://www.roskill.com/reports/industrial-minerals/ground-and-precipitated-calcium-carbonate-1Get in Touch with Mechanic