How to get to Hong Kong Island East Center

1. In November of 16, I moved to a single family building on the southeast side of Shenzhen Bay Sports Center (spring cocoon), No. 3001, auxiliary road, Binhai Avenue, Nanshan District. It was very big and magnificent

2. Two fastest routes are recommended

1. Take Metro Line 2 at Beijing station, change to Metro Line 13 at Ximen, change to No. 331 at Wukou, and get off Xiangshan Park

2. Take Metro Line 2 at Beijing station, change to No. 360 at Ximen, and get off Xiangshan Park

3.

Gold is located in the third position of sub Group IB in the sixth period of the periodic table, and belongs to the copper group. Therefore, gold is often associated with copper and silver. In the crystal structure, gold, like copper, silver, lead and other elements, has an equiaxed hexagonal octahedral copper structure. Its atoms are located at each point of the face centered cubic lattice, belonging to the space group fm3m. The unit cell contains four atoms, and the cell edge of gold is 4.07825 (25 ℃)

the occurrence of crustal movement often destroys the equilibrium state of Geophysics and geochemistry in the crust, and at the same time, various elements will have their own movements. According to the law of Le Chatelier, the equilibrium of a system is destroyed by external forces, and the internal system reacts immediately, so that the equilibrium conditions counteract the direction of external forces. The movement state of elements always absorbs energy from mild to severe, and releases energy from severe to moderate. Therefore, the process of mineral crystallization from magma or solution is the process of energy release. Generally, the elements with larger energy coefficient and stronger crystallization ability are the first to crystallize and proce the compounds with the largest exothermic effect. By analogy, the elements with low energy coefficient and poor crystallization ability finally crystallize, and even continuously transport and migrate (Huo Mingyuan et al., 1991)

It is obvious that the temporal and spatial distribution characteristics of large-scale mineralization in the crust mainly depend on the changes of ore controlling conditions such as crustal movement, tectonic deformation, underground fluid, magmatic activity, metamorphism and geophysical and chemical field of the earth. The changes of these conditions depend on the deep processes of the earth, especially the deep sources of ore-forming materials. Therefore, the anti gravity migration of ore-forming materials controlled by the multi-stage evolution of mantle plume may be the key to the understanding of massive mineral accumulation

As mentioned above, since the Mesozoic, the crustal movement has entered a new active period, the activity of mantle plume has been enhanced, and even the North China platform, which has been stable for more than one billion years, has also started strong activity, and formed the main metallogenic concentration area (stage) in the Mesozoic. The ascending mantle current connects the deep sources of gold, silver and other elements, but the amount of ore-forming materials depends on the surging intensity of the core mantle boundary, and the surging of the core mantle is affected by the equilibrium state of the core mantle and external excitation factors. Therefore, the content of ore-forming elements in the upwelling mantle plume will change with the intensity of the core mantle plume, and the ore-forming process will have obvious stages. However, there is no doubt that the Mesozoic era is the most intense ore-forming stage on the earth

The ore-forming elements such as gold and silver migrate upward with the multistage evolution of the mantle plume, and the closer they are to the upper crust, the more obvious they are affected by the tectonic movement, which is closely related to the physicochemical state of the rocks. In the deep part of the earth, the mantle material changes little in the horizontal and vertical directions, and the mantle plume is basically driven up by the initial power and heat of the core mantle boundary, with few interference factors. When the local mantle plume passes through the upper and lower mantle boundary and continues to rise in the form of sub plume, it will be affected by the shape of lithosphere bottom, lithosphere delamination, thinning and rooting, and lithospheric deep ctile shear zone

taking the North China mantle sub plume as an example, the sub plume migrated upward to the bottom of the lithosphere, was blocked and changed direction, and extended to the periphery in a hemispherical crown. The crust of the upper part of the sub plume was thermally thinned and developed into a large fault basin. In the periphery of the sub plume, the uplift dominated orogenic belt was formed e to the tilt of the mantle, the thickening of the lithosphere and the lack of gravity. Driven by the mantle sub plume, the strain softening materials in the deep lithosphere can flow along the crust mantle transition zone at the top of the upper mantle and the low velocity zone of the middle and lower crust (ctile rheological detachment zone) to the root of the orogenic belt, and can be transformed into anatexic magma upwelling e to the cutting of the ctile shear zone at the axis of the orogenic belt and the decompression and release of the load The mantle branch structure in the form of vertical uplift

the elements such as gold and silver continuously move upward with the multi-stage evolution of mantle plume. Under the condition of deep ultrahigh temperature and pressure, the elements such as gold and silver dissolve in the form of gas and diffuse in the magma. Therefore, the ore-bearing fluid often migrates from the mantle sub plume to the mantle branch structure, and with the evolution of the mantle branch structure, it accumulates in some specific metallogenic concentration areas

4. Methods of gold extraction from gold ore:
method 1. Gravity separation:
1. Method introction:
gravity separation plays a very important role in placer gold proction. Gravity separation is widely used in rock gold mines. It is mostly used as an auxiliary process to recover coarse gold in grinding circuit, creating favorable conditions for cyanidation process, improving beneficiation index and increasing total recovery rate of gold, It plays a positive role in increasing output and recing cost
2. Equipment used:
the main equipment used are chute, shaker, jig and short cone cyclone< Method 2: flotation method:
method introction:
flotation method is widely used in rock gold mines. At present, about 80% of rock gold mines in China adopt this method for gold separation, and the level of beneficiation technology and equipment has been greatly improved. There are usually two kinds of flotation processes: preferential flotation and mixed flotation. In recent years, new progress has been made in technological process improvement and reagent addition system, and flotation recovery has been improved significantly.

5.

Traditional gold extraction methods are in the form of natural ore or gold sand extracted from the soil

According to the different types of ores, there are different methods:

1. Raw ore roasting

this kind of ores are mostly sulfur poor or sulfide poor fine disseminated gold ores, and contain a lot of argillaceous minerals, resulting in low gold flotation recovery and difficult to improve concentrate grade; However, e to the existence of organic carbon and other harmful elements, the leaching rate of gold is also very low by using the whole slime cyanidation process

2. Roasting of gold concentrate

the gold and sulfide in most refractory ores are closely related. The gold bearing sulfide can be fully and effectively enriched by flotation method to proce gold concentrate with high flotation recovery

because the composition of flotation gold concentrate is complex, and the content of beneficial and harmful elements is high, the leaching rate of gold is low by direct cyanide leaching
therefore, roasting oxidation pretreatment of this type of refractory gold concentrate is one of the effective methods to improve the gold leaching rate

Hot press oxidation process is to oxidize and decompose pyrite and arsenopyrite under a certain temperature and pressure, so no matter how small the gold particles are, they will be dissociated, making the gold leaching rate higher

after pressure oxidation, the leaching rate of gold in many refractory gold concentrates can reach more than 96%
however, it is difficult to eliminate the "robbing gold" effect of organic carbon in this process, so the application of this process is limited for gold concentrates with high organic carbon content

extended data:

Chinese and Russian experts have jointly developed a new technology for extracting gold from ore, which can rece the cost of gold mining by 30% to 40%

the traditional gold extraction method is to extract gold from soil in the form of natural ore or gold sand. The new technology is different from it in that it is refined by chemical processing of copper ore or other ores containing gold

with the help of water and cyanic acid compounds which are easy to combine with gold, metals can be extracted directly from ores. A similar process helps to extract almost all the gold from the ore, but the process is extremely slow and expensive, taking at least 100-120 hours, and the cost of obtaining 30 grams of gold in this way is about $800 per ounce

6. At present, the brand-new presidential commemorative coins of the United States are 12-15 yuan in the domestic coin market. However, Americans have no habit of hyping the commemorative coins. In addition, there is no possibility of hyping the circulation of tens of millions or even hundreds of millions of American commemorative coins. Therefore, these presidential commemorative coins and 25 cent commemorative coins can be seen everywhere in the domestic currency market of the United States.

7. Hello
Why do I see differences? After all, the prices are different. How can they be the same? It's just that they may have the same range of rise and fall, so they look the same. But if you look at them carefully, you can see that they are different
if you have any questions, please ask.

8. Unknown_Error

9. In a physical system, if a particle moves from the starting point to the ending point, e to the force, the work done does not change because of the different paths. Then the force is called conservative force. If all the forces in a physical system are conservative forces, then the system is called conservative force.
gravity, elastic force, electric field force and universal gravitation are all conservative forces, The work done by these forces is independent of the motion path of the object, and only related to the initial and final position

10.

The common elasticity is conservative. Support pressure they are both elastic and conservative

In a physical system, if a particle moves from the starting point to the ending point, e to the force, and the work done by the force does not change e to the different paths, it is called a conservative force. If all forces in a physical system are conservative forces, the system is called conservative system

the work of conservative force has nothing to do with the path the object moves through, but only with the position of the starting point and the ending point of the moving object, and of course also with the nature of the conservative force field

Elastic force is also called "elastic force". When an object is deformed by an external force, if the external force is removed, the original shape of the object can be restored, which is called "elastic force". Its direction is opposite to that of the external force that deforms the object. Because there are many kinds of deformations of objects, the elastic force proced also has various forms. For example, when a heavy object is placed on a plastic plate, the bent plastic will return to its original state and proce upward elastic force, which is its supporting force to the heavy object. When an object is hung on a spring, the object elongates the spring. The elongated spring needs to return to its original state and proce upward elastic force, which is its pulling force on the object. Not only plastics and springs can be deformed, but any object can be deformed. There is no object without deformation. However, some deformations are obvious and can be seen directly; Some of the deformations are quite small and can only be detected by instruments

the elastic force is proced between the objects which are in direct contact and have elastic deformation. Generally speaking, pressure, supporting force and pulling force are elasticity. The direction of elasticity is always opposite to the direction of deformation. The direction of pressure or supporting force is always perpendicular to the supporting surface and points to the pressed or supported object

Generally speaking, the pulling force is also elastic. The pulling force of the rope is the elastic force of the rope to the object pulled. The direction is always along the rope and points to the direction of the rope contraction