How to say digital currency in Japanese

3. Cryptocurrency_ The translation results are as follows:
encryption current
current
English; kʌ r(ə) nsɪ]
beauty; kɜ rə NSI]

n; Currency
more definitions & gt& gt;

[network phrase]

currency, currency, circulation
soft currency, weak currency, soft currency
domestic currency, domestic currency, domestic currency

4. Which is better? It depends on your specific needs. Just now from the tenth power computing power leasing platform, we can see that if there is no shortage of funds, we can buy computing power. However, if there are not so many funds in the early stage, it is more cost-effective to rent computing power. I think the same is true. If the budget is enough, we can directly purchase the computing power.

5. 1.1 geological conditions of the deposit
the Pb Zn deposit occurs in the metamorphic volcanic rock series and belongs to the hydrothermal sedimentary reformed sulfide deposit of marine volcanic rock series. The geological structure of the mining area is a short axis anticline. The deposit is a concealed deposit. The orebody is lenticular and stratoid, and occurs in strongly altered quartz keratophyre. The ore body is parallel to the rock stratum and occurs along the slice. The ore types are mainly massive ore, disseminated ore and pyrite. The shape and stability of ore block is slightly better, accounting for 57% of the total ore, and the stability of disseminated ore body is poor, accounting for 41% of the total ore
1.2 mining technical conditions of the deposit
the strike length of the ore body in the mining area is about 800m, the inclined length is 600m, the average thickness is 15.5m, and the dip angle is 60-80 degrees. The ore is copper bearing lead-zinc sulfide ore, containing 21 kinds of useful metals. The average grade of main elements is Cu: 1.66%, Pb: 4.61%, Zn: 5.87%, s: 19.50%. The joints and fissures of ore body and immediate surrounding rock are developed, the stability is poor, and large exposed surface is not allowed. The footwall quartz albite porphyry has good stability. The physical and mechanical properties of ore and rock are as follows:
Table 1.1 physical and mechanical properties of ore and rock
type weight T / m3, loose coefficient F value, natural angle of repose ° Remarks
massive ore 4.41.768-1445-50 has good chiselability
disseminated ore 3.11.926-845-50 has good chiselability
pyrite 3.61.7210-1245-50 has good chiselability
quartz hornblende tuff 2.91.96-845-50
chlorite phyllite 2.651.724-645-50
quartz albite porphyry 2.651.638-1045-50 has good chiselability
the tectonic stress of the mining area is significant, The horizontal stress is 1.5-1.8 times of the vertical stress, and the disseminated ore and quartz hornblende tuff are easy to muddle when they meet with water. The ore hydrogeology is relatively simple. The surface is allowed to fall. The ramp development scheme of main and auxiliary shafts is adopted. The annual proction capacity of the mine is 330000 tons
Chapter 2 selection of mining method 2.1 scheme primary selection
because of the poor stability of surrounding rock, open stope mining method can not be adopted. According to the value and grade of the ore, the stability of surrounding rock and ore, the scale of the deposit and other conditions, as well as the stability of ore surrounding rock, the dip angle and thickness of the ore body and the allowable collapse of the surface, three mining methods are preliminarily selected:
2.1.1 sublevel caving with sill pillar
sublevel caving with sill pillar is also called sublevel caving with bottom structure. The main feature of this method is that the mining is carried out one by one from top to bottom, and a special bottom structure (bottom pillar) is set at the bottom of each section. According to the caving method, it can be divided into two types: Horizontal Deep caving with sill pillar sublevel caving and vertical deep caving with sill pillar sublevel caving. The former method has obvious ore block structure, and each ore block generally has an independent and complete system of ore drawing, ventilation, pedestrian and material conveying equipment. In addition, in the lower part of the caving layer, it is generally necessary to excavate compensation space for free space blasting. In the latter method, extrusion blasting is mostly used, and the stoping is continuous, and the stoping block has no obvious boundary
2.1.2 pillarless sublevel caving method
the basic feature of this method is that the lower part of the sublevel is not equipped with a bottom structure composed of a special ore drawing roadway, and the sublevel drilling, ore caving and ore drawing are carried out in the mining roadway. Therefore, the stope structure is greatly simplified, which creates favorable conditions for the use of trackless self-propelled equipment, and ensures that workers can work under safe conditions
2.1.3 upward horizontal slicing and filling method
this method generally divides the ore block into room and pillar. The first step is to recover the room and the second step is to recover the pillar. When the stope room is mined, the horizontal slicing filling is carried out from the bottom to the top. Although the working face is advanced upward, the goaf is graally filled, and the working space for further mining is reserved. The filling body maintains the surrounding rock of the two sides and serves as the working platform for upper mining. The collapsed ore falls on the surface of the filling body and is transported to the ore pass by mechanical means. When the room is mined to the top layer, the roof is connected and filled. The mine owner will carry out stoping after mining several rooms or whole stage stoping. The filling method of stope room can be dry filling, hydraulic filling or cemented filling. Dry filling method is rarely used at present< 1. Sublevel caving with sill pillar. The stage height is 50m, the section height is 25m, and the rake track spacing is 10m. Funnel drawing is adopted and the height of sectional bottom pillar is 6m. Yq-100 rock drill
2. Sublevel caving without sill pillar. The stope is arranged along the strike of the ore body, the height of the section is 10m, and the distance between the mining roadways is 8m. The mining work is carried out from one wing to the other. Ygz-80 rock drill is used for drilling and zyq-14 truck is used for loading
3. Upward horizontal slicing filling method. The stope is divided into room and pillar. The width of the room is 15.5m and the width of the pillar is 6m. The length of the mine room is arranged along the strike. The room is mined with upward horizontal slicing tailings cemented filling, and the pillar is mined with upward drift filling method. First mining room, then mining pillar. Ysp-45 rock drill is used for drilling and zyq-12 truck is used for loading< Technical and economic analysis
2.3.1 list analysis
Table 2.1 technical and economic analysis
Index Name: sublevel caving with sill pillar, sublevel caving without sill pillar, upward horizontal slicing and filling
1. Ore block proction capacity 100 ~ 250, 350 ~ 400, 120 ~ 160
2. Mining and cutting ratio 16 ~ 20, 14 ~ 15, 10 ~ 18
3. Ore dilution rate 10% 20% 9%
4. Ore loss rate 10% 25% 9%
5 Cost (yuan / ton) 19 ~ 24 19 ~ 24 25 ~ 302.3.2 applicable conditions of various mining methods, advantages and disadvantages comparison:
1. Sublevel caving with sill pillar
1. Applicable conditions: (1) surface caving is allowed. However, if the surface soil falls behind the water with the formation pump, a large amount of mud may flow into the well, so it is necessary to take preventive measures 2) Thickness and dip angle of ore body. The thickness of extremely inclined ore body is not less than 5m, and that of inclined ore body is not less than 10m; When the thickness of ore body is more than 20m, the dip angle is not limited. It is most suitable for extremely inclined ore body with thickness of 15 ~ 20m or more 3) Rock stability. The stability of hanging wall rock is not limited. When the rock is broken and unstable, the sublevel caving method is more suitable than other mining methods. Because the mining preparation project is arranged in the footwall rock, the stability of footwall rock is better than medium stability 4) Ore stability. The stability of ore should allow the layout of mining and cutting engineering in the ore body. After proper support, the ore roadway should not be damaged ring the ore drawing period, so the stability of ore is not less than medium stability 5) Ore value. Not in special favorable conditions (dip angle greater than 75 ~ 78) °， When the thickness is more than 15 ~ 20m and the ore body is relatively regular, the ore loss and dilution of this method is large, so it is only suitable for mining the ore body with low ore value 6) Rock thickness and ore properties. Because this method can not separate mining, it is better that there is no thick rock interlayer in the ore body. When the dip angle of ore body is large and the mining section is high, the ore must be free of spontaneous combustion and caking< The main advantages of the method are as follows: (1) because the method has a variety of mining schemes, it can be used to mine various ore bodies under different conditions, so it is flexible and widely applicable 2) The proction capacity is large, and the annual depth can reach 20 ~ 30m, and the output per unit area of ore body can reach 75 ~ 100t (m2. A) 3) The equipment for mining and drawing is simple, easy to use and maintain, and the domestic equipment and supply conditions are very good 4) Compared with other caving methods, the ventilation condition is better and there is through air flow< The main disadvantages are as follows: (1) large amount of cutting work and low degree of construction mechanization. The bottom structure is complex, and its engineering quantity accounts for about half of the whole cutting engineering 2) The ore loss and dilution is large, especially when the ore body is not steep and the thickness is small< Applicable conditions: (1) the surface and surrounding rock are allowed to collapse 2) The stability of the ore is above medium, and a large amount of support is not allowed in the mining roadway 3) The extremely inclined or gently inclined thick orebody can also be used for large medium thickness orebody 4) When it is necessary to remove the inclusion in ore or to separate ore, this method is the most favorable< Main advantages: (1) good security. All mining operations are carried out in the roadway; In the end of the mining roadway, generally large pieces can flow into the mining roadway, and this crushing work is relatively safe 2) The stope structure is simple, the mining technology is simple, and it is easy to be standardized. It is suitable for the use of high-efficiency large trackless equipment 3) High degree of mechanization 4) Because each step is taken as the minimum mining unit for ore caving and ore drawing, it is possible to remove the rock inclusion and carry out ore grading when the geological conditions are suitable< The main disadvantages are as follows: (1) the ventilation of mining roadway is difficult 2) When the stope structure and drawing method are not appropriate, the ore loss and dilution are large 3) The intensity of stope is lower than that of caving with sill pillar< Applicable conditions: it is used for mining non-ferrous or rare metal bodies with unstable ore or unstable ore and surrounding rock, high ore grade or high value
advantages: small ore loss and dilution, low efficiency and high labor intensity. The application of hydraulic filling and cemented filling technology, as well as the use of trackless self-propelled equipment in the mining work, has raised the ordinary filling method to a new level of mechanized filling mining method and entered the ranks of high-efficiency mining methods. Its scope of application is constantly expanding and there is a trend of further development< Disadvantages: (1) high filling cost. According to statistics, hydraulic filling accounts for 15% ~ 25% of the direct mining cost, while cemented filling accounts for 35% ~ 50%. The high cost is e to the use of expensive cement and the use of compressed air to transport cemented filling materials. Therefore, it is necessary to seek cheap cement substitutes or adopt a small cement sand ratio (1 ∶ 25 ~ 1 ∶ 32) and a new method of transporting cementitious materials 2) The filling system is complex. In our country, cemented filling is usually used to fill the stope room first, and then hydraulic filling is used to fill the stope pillar, which makes the filling system and proction management complicated. If cemented filling is used in both steps, the cost will increase 3) It is difficult to recover the pillar between stages. Hydraulic or cemented filling creates safe and convenient conditions for the inter pillar, but the top pillar mining is still very difficult
2.3.3 the final scheme
it can be seen from the above table that the sublevel caving method with sill pillar has a large amount of mining and cutting work, complex bottom structure and higher ore loss rate than the upward horizontal slicing and filling method. The ore loss rate and dilution rate of pillarless sublevel caving are the highest. This mine is a metal mine with 21 kinds of useful metals. Obviously, this method is unreasonable. Although the ore block proction capacity of upward horizontal slicing and filling method is smaller than the above two mining methods, it has the advantages of small mining and cutting quantity, high recovery rate, low dilution rate, high filling body strength, good self-reliance, high reliability as concrete pillar, safe proction, low consumables and high efficiency. It is especially suitable for recovering ore body with dip angle of 70 ~ 80 ° In the middle of the metal mines. Therefore, the upward horizontal slicing filling method is finally selected.

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