Tag: China

Communication power in the overall development of our country how? What are the problems to be solved? What are the latest relevant technology advances? Stage communication power technology going? Common concern for the readers of these topics, the reporter went to China before the opening of the communications equipment technology exhibition, through personal experience and communication, understand the communication power supply hot technology at the present stage of progress and the situation of production.

Communication technology rapidly to the diversification of power
Communication network development through the exchange of air separation from the simulation-based T DM Exchange network, the number of hours long process of development. The new century, NGN Research and commercial applications is becoming hot. Accordingly, also requires the rapid development of communication power supply technology to cope with network evolution. This reporter learned that, as a basis for the application of communication power, its technology and changes in different speed and other products, such as it is not the core network, access network and terminal equipment, as rapid development, but this does not mean stagnation Power Sources or old-fashioned one. In the exhibition scene, we see Emerson, power source, Section Chinese technology companies have demonstrated the power of diversification of products or even complete power solution, from which we can clearly see, the whole power supply technology toward multi-communication technology development. In specific products, the company exhibited to the audience AC / DC switching power supply, DC / DC switching power supply, UPS, AC variable frequency power supply, sine wave inverters and other new products, according to experts, in addition , electric operating power, high frequency rectifier inverter Welding Power, high-power high-frequency high-voltage DC power supply, chemical supply, and the green line with the trend of development Illumination Power, wind and solar power supply, also has been into the spotlight. Corresponding to these products, high frequency conversion technology, all resonant high frequency soft switch technology, power conversion technology and other advanced technologies are emerging, the emergence of these technologies to ensure the smooth flow of the entire communication network has made a great contribution.

High efficiency is the inevitable trend of development of communication power
Continuous research and development of new high-performance devices, the emergence and application, promote the upgrading of power products, making the power of the switching frequency is increasing. At present, power supply switching frequency up to 300kHz ~ 400kHz level, and small power supply has been achieved 1MHz switching frequency, and increased power density, which progress and development of power technology plays an important supporting role. In addition, the insulated gate bipolar transistor (IGBT), power field-effect transistor (MOSFET), a new magnetic materials and Transformer The application of new technologies also greatly enhanced power efficiency.

During the visit, the reporter learned that soft-switch technology, the leading issue of quasi-resonant technology research has become mature and stable, which is typical resonant transformation phase resonant, zero-switching PWM, zero-transition PWM, etc. new theory of topology, their focus is to reduce the hard-switching mode, the last opening of the power device, the switching devices during the switch voltage up / down and current up / down wave generated by wear and tear and noise overlap, and zero-voltage / zero current switching, reduce losses and improve power systems stability and efficiency. In short, the road towards the development of high efficiency not only in the enterprise, Operation The vital interests of the business, but also in response to a national call to build a conservation-oriented society.

Communications network power management to move
With the increasing popularity of Internet technology and the continuous development of information processing, communication systems from the previous stand-alone or small local systems development Tai LAN systems, WAN systems, so support the protection of telecommunications terminal equipment, the Internet aspects of electronic switch power supply must have the data processing and communications capabilities, including technical personnel can make the network at any time Monitor Power equipment operation status and the technical parameters of the smart user interface, with all kinds of protection, alarm and data information storage, processing, printing and other functions, and enables network technicians to exchange or preparation time switches Electricity Source of the remote switching machine function.

Show, we see the Emerson Network Power Monitoring System, which applies to all kinds of power stations for Telecommunication equipment and its environment in real-time monitoring and unified management. On the power management problem, the experts said, with the power management system, monitoring continuous improvement, we can achieve under different circumstances and flexible resource allocation, unified management, in order to ensure Telecommunications System reliability.

Communication to achieve full digital power control

At the show site, we also see a digital power control technologies. On-site technical staff to reporters about the construction of communication networks in China have their own coin, and in many areas such as natural environment and are relatively backward economy, communications facilities in those areas in which complex, sparsely populated, traffic inconvenience, no doubt increase of communication facilities, including maintenance of power systems communication difficulties, in this case, digital technology on traditional simulation technology to show the advantages can not be achieved.

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Sulfuric acid slag gold extraction technology
At present, China has obviously been the gold exploration and use of resources can not keep up production requirements of the situation, which restricts the improvement of China’s gold production, at the same time, from the gold-bearing wastes and the recovery of refractory gold ores and technical support policies are not ideal, This part of the gold resource has not yet been fully utilized. sulfuric acid slag recovery of gold-bearing pressing technology development(Used Stone Crusher).

China’s annual gold produced hundreds of tons of sulfuric acid slag, currently only greater than 3 g / ton slag can be used each year, only 7.5 million tons of processing power, and the remaining slag or waste disposal or to more than ten million Queensland / tons sold to cement plants as raw material? contained gold lost in vain, very regrettable.
Technical literature from abroad to see, from the cinder gold recovery technology is also limited to cyanidation process, re-elected, flotation, magnetic separation, thiourea process etc in the research stage.

The current cyanidation process is only suitable for processing gold grade higher than 2.5 g /? Tons of sulfuric acid slag, low-grade and then the profit is too low, investment is difficult to recover in the short term, so despite good social benefits, but economic efficiency is not gold extraction plant was built without enthusiasm; heap leaching method, while the cost of production can reduce, but not continuous production and winter can not produce, so this process is difficult to promote; re-election, magnetic separation and flotation recovery can burn Queensland residue part of gold, but the recovery rate as high and cyanidation of the concentrate produced from recycled gold in the recovery time is not ideal, it is difficult to promote. Thiourea leaching method and the high cost of pharmaceutical conditions difficult to control, the solution is still satisfactory gold recovery methods, still in the exploratory stage, is still far from industrial applications.

We believe that the impact of gold from the slag in the two main factors, one investment is too large, and second, high production costs. If you can solve these two problems, low-grade sulfuric acid slag gold extraction technology will be successfully promote.

Through our technology to promote the use of cyanidation study found that the process has the following problems(Used Stone Crusher For Sale):

(A) Changchun Gold Research Institute of years of research shows that sulfuric acid slag does not have to wear cyanide leaching rate can be guaranteed, with the purpose of paragraph miners grinding just to ensure the cyanide reaction slurry was stirred evenly, do not sink tank. ground miners segment investment of more than 40 million production costs as high as 15 yuan / ton, if the way to cut through the other steps, cyanidation of Queensland investment and production costs will drop dramatically.

(B) As by discharge after the grinding thickener overflow the washing – to remove cinder dissolution of iron and copper impurities in the grinding process can not add cyanide? So the poor can not be fully recycled liquid, poor liquid discharge treatment not only production costs, but also cause environmental pollution, in some areas of high environmental quality, environmental protection department will not approve construction of cyanidation plant.

(C) the number of sulfuric acid plant was built in the city?, Not enough space to build larger tailings. Using the current cyanidation process, whether used with zinc replacement, or CIP, must be the end of the separation filter cyanide the residue, the residue with a motor vehicle to transport it to another place. Filter section in increased investment, because of grinding the slag fine particle size increased the difficulty of filtering, an increase of production costs.

(D) make poor use of zinc replacement fluid zinc concentration increased, the leaching conditions deteriorate, resulting in lower gold recovery; as cinder hardness, wear and tear with a large carbon CIP, gold loss, and increased production costs.

(E) the maximum cyanidation reaction time is not long enough, usually at least 16 hours, which requires the construction of a large volume of leaching tank, investment increases, power consumption increases, plant size increases.

In summary, low-grade sulfuric acid from the cinder of gold leaching must develop new technology or new technology, investment and reduce costs. The specific studies include the following way:

1, using the new extraction equipment, not grinding to ensure the smooth progress of the leaching reaction. And leaching power consumption does not increase or increase less.

2, the use of fast leaching leaching method, the leaching time is only a few hours or less. Increase the leaching effect of stirring intensity to ensure that, due to short reaction time, the unit power consumption does not increase much.

3, using the whole cycle of poor fluid process, nothing more than rows of waste water, waste water treatment cost savings, savings leaching agents.

4, with the fixed bed adsorption recovery of gold from your solution, no washing or CIP section in steps, dip directly after filtration, improve your concentration so that the absorbent liquid gold on gold grade increase, reducing equipment investment and production costs.(Used Stone Crusher Plant For Sale)

Through extensive research and testing, select a water chlorine method process.? Small test results show that the leaching rate is higher than the cyanide method,? The reason is that the process of cyanide on the gold surface of the slag particles hinder gold leaching and diffusion of membrane . The nature of the residue by burning – cyanide tailings acid when the calcination temperature of vital importance.