1. Product description:
Gas cutting is achieved by what is basically a chemical/thermal reaction occurring with iron and iron alloys only. Iron or its alloys may be heated to a temperature at which the iron will rapidly oxidize in an atmosphere of high purity oxygen. There will generate large amount of smoke during gas cutting, which is harmful to worker`s health and the service life of cutting machine. Therefore, dust and smoke extraction system is needed to removal these hazardous partices.
2. Moland Product Series
Portable Fume Extractor series: MLWF50, MLWF70, MLWF100, MLWF360, MLWF120, MLWF200, MLWF280-basic, MLWF280S, MLWF290, MLWF300, MLWF300A, MLWF350, MLWF350D, MLWF400, etc.
Stationary fume extractors: MLWF350-dust bucket type, MLWF500-6T, MLWF500-6T dust bucket type, MLWF500-9T, MLWF800, MLWF800-dust bucket type, MLWF1000, MLWF1500, MLWF2000, MLWF3000, MLWF3500, MLWF4000). The electric control cabinet can be seperated from main equipment for convenient operation when the main equipment is placed outdoors.
Grinding dust extractors: MLWF100D, MLWF150D, MLWF200D, MLWF320-DM, MLWF180, MLWF380, MLWF480) and grinding cabinet (MLWF900). The grinding cabinet is usally equipped with telescopic or fixed grinding room, to form a semi-closed space to control dust and smoke spread. It also improves the filtration efficiency with low air volume and energy consumption.
VOCs treatment
3. R&D
In order to provide advanced products, our R&D department develops 3 to 5 new products every year, and irregularly improves the performance, appearance, and installation methods of existing products.
4. Certification
All our products are approved by CE, ISO9001, ISO14001, utility model patent, design patent, Program copyright, etc.
5. Exhibition
Moland participates at least 5 industry exhibitions each year.
6. Central Fume Extraction System
1) Cantilever type fume extraction system
Cantilever dust removal can be used for manual welding conditions where the work stations are evenly distributed and the span is small. The smoke and dust generated by each welding station can be effectively absorbed at the dust generation point, and will not pollute other parts of the workshop. The skeleton of the suction arm is similar to a human arm and can hover in a space within a certain length. The outer layer of the suction arm is a temperature-resistant hose, which not only prevents the hose from being burned by sparks, but also ensures the flexibility of the movement of the suction arm. A unique rotating structure is designed on the position of the Suction Hood to ensure that the suction hood can be aligned with the welding position in any orientation, so that the suction arm can effectively capture the smoke and dust generated during the welding process. The advantage of the suction arm capture is that it can be close to the place where the smoke is generated, and the collection effect is better.
2) Hood suction type fume extraction system
Cantilever dust removal can be used for manual welding conditions where the work stations are evenly distributed and the span is small. The smoke and dust generated by each welding station can be effectively absorbed at the dust generation point, and will not pollute other parts of the workshop. The skeleton of the suction arm is similar to a human arm and can hover in a space within a certain length. The outer layer of the suction arm is a temperature-resistant hose, which not only prevents the hose from being burned by sparks, but also ensures the flexibility of the movement of the suction arm. A unique rotating structure is designed on the position of the suction hood to ensure that the suction hood can be aligned with the welding position in any orientation, so that the suction arm can effectively capture the smoke and dust generated during the welding process. The advantage of the suction arm capture is that it can be close to the place where the smoke is generated, and the collection effect is better.
3) Room tupe fume extraction system
Room-type dust removal is suitable for the purification of fumes and smoke generated during the production of automated equipment, such as welding robots, welding machines, grinding, grinding and polishing of metal and plastic parts, drilling, thermal processing, cutting and crushing, stone processing, powder packaging, solid particles and various dusts and fumes produced by mixing and processing.
For working conditions such as robot automatic welding, circular seam and longitudinal seam welding, the smoke and dust purifier is installed with the robot workstation, so that the workstation has its own dust removal function. The fume and smoke are effectively collected through equipment components such as pipes and dust hoods. The room-type design prevents the volatilization and diffusion of smoke to keep the air in the workshop clean.
The working conditions with moderate welding workpieces and large amounts of dust and smoke are suitable for room-type treatment solutions. The room type centralized dust dedusting solution is divided into side suction and top suction method dust collecting ways. The appropriate solution can be designed according to the site conditions and treatment goals.
4) Blow suction type fume extraction system
Blow-suction type dust removal solution is a ventilation air flow composed of blown air and inhaled air flow. Therefore, it is a dust removal method that can effectively control the spread of pollution sources. This dust removal method is installing exhaust inlets on two-span center column or single-span side column (wall) and air outlets on the opposite wall column to form a circulating air flow to drive the smoke and dust into the purification machine, consequently performing overall dust removal and purification in the workshop. This system occupies a small area and has obvious purification effect, which is suitable for the purification of smoke and smoke in more complex production workshops.
7. Company information
Jinan Moland Environmental Tech Co., Ltd., is located in No. 11889 Jingshi West Road, Changqing District, Jinan City, Shandong, China, established in 2016. It`s an environmental protection technology enterprise specializing in research, development, manufacture and sale of efficient smoke purification systems.
The company is committed to reducing the environmental impact of production process, protecting workers from harmful gases and dust, and creating a cleaner working environment. At present, the company′s products have been successfully applied in automobile, railway, construction machinery, marine engineering, aviation and other mechanical processing industries, as well as new materials, grain, wood, recycled resources processing and other industries. The company has passed the ISO 9001 quality management system certification, obtained the certification of China Environmental Protection Products issued by China Environmental Protection Industry Association, and CE certification of EU. It also has a number of invention patents, utility model patents and appearance patents. Through continuous R&D and innovation, many products of the company have reached the international leading level.
Moland′s environmental services cover the whole process from project design, product manufacturing to installation, commissioning and after-sales service. We will provide you with the most professional governance program and the best quality service.
Flame Cutting Fume Extractors,High Efficiency Cartridge Fume Purifier,Welding Dust Remover,Dust Control Systems Jinan Moland Environmental Tech Co.,Ltd , https://www.sdmoland.com
Heilongjiang Provincial Bureau of solidarity wulaga gold mine gold deposit is a large gold deposit, which applies a combination of stairs and steep slope mining technology, the expansion of mining in 1988 after the comprehensive production capacity of 1200t / d.
First, mining technical conditions
The No. I ore body in the Tuanjiegou Gold Mine has the largest scale, accounting for more than 96% of the industrial reserves. The strike length is 1550m, the elevation is 250-122m, the slope is 450m, and the maximum thickness of the ore body is 130m, with an average of 46m and an inclination of 20 ° ~ 30 °. The ore body is divided into two sections, east and west, with the 115-111 exploration line as the boundary.
The eastern ore body is especially developed between 107 and 112 lines, forming a thick ore body and exposing the surface. The elevation is 206 to 30 m, which is like a funnel, and the ore body is 200 m deep. The western ore body expands and develops between 115 and 131 lines. The ore body has an elevation of 160 to 50 m, which is a concealed ore body. The ore body has a funnel shape with a depth of 210 m and an average thickness of 50 to 70 m. The average thickness of the ore body is 46m, the length is 250m, the inclination angle is 20°~26°, and the average grade of ore is 3.55g/t. The surrounding rock of the ore body is relatively stable and the groundwater is rich.
Second, mining methods and mining technology
According to the conditions of the ore body and the expansion requirements, through technical and economic analysis and comparison (see Table 1), the shallow parts of the eastern and western mining areas are all open-pit mining, and the mining order is the Houxi District of Xiandong District.
Table 1 Comparison of mining schemes
Project
Program
I
II
III
East mining area
West mining area
East mining area
West mining area
East mining area
West mining area
Mining method
Open-pit mining
Open-pit mining
Open pit mining
Underground mining
Mining sequence
First
Simultaneously
Simultaneously
Production capacity /t·d -1
1200
1200
750
450
750
450
Way of development
Single car
Single car
Single car
Shaft
Mining method
Combination step
Combination step
Group step
Downward cementing filling
Ore depletion rate
6
6
6
10
Ore loss order
4
4
4
10
Excavation grade /g·t -1
3.897
3.666
3.614
Metal production (gold) / kg · a -1
1402.92
1319.76
1301.04
Infrastructure capacity / 10,000 m 3
100
900
60
11580/m7.6
Infrastructure investment / 10,000 yuan (mining part)
2000
4500
2900
Annual stripping capacity / 10,000 m 3
180
140
112.5
Annual output value / 10,000 yuan · a -1
3771
3548
3497
Annual operating fee / million yuan · a -1
2544
2445
2712
Annual profit / million yuan · a -1
1227
1103
785
Open-pit mining boundary parameters are listed in Table 2.
Table 2 Open-pit mining boundary and working parameters
Project
East open pit mine
Western open pit mine
Project
East open pit mine
Western open pit mine
Upper elevation / m
258
242
Final slope angle / (°)
36~43
36~38
Bottom elevation / m
60
10
Work help slope angle / (°)
13~25
13~25
Upper boundary size / m·m
760×480
660-580
Cleaning platform width / m
8~15
8~15
Bottom boundary size / m · m
150×60
90×50
Transport platform width / m
12
12
Step height / m
10
10
Minimum working line length / m
200
200
Step slope angle / (°)
50-75
50-75
Minimum working platform width / m
35～45
35～45
Closed circle elevation / m
120
180
Different mining and stripping processes have different effects on infrastructure and infrastructure cycles, and are compared by technology and economy (see Table 3).
Table 3 Infrastructure Construction Scale
Level
Single step stripping process
/ million m 3
2 sets of combined price stripping process
/ million m 3
4 sets of combined price stripping process
/ million m 3
Above 240m level
81.91
81.91
75.83
240~230m
51.30
34.1064
30.9764
230~220m
76.08
54.6251
31.8051
220~210m
65.40
38.2992
37.5992
210~200m
81.60
63.4193
35.6750
200~190m
70.52
58.1495
41.1983
190~180m
53.236
84.7293
34.2126
180~170m
23.45
37.9081
29.4732
1704160m
4.45
2.20
5.7
total
467.946
455.3406
322.4698
Of which: the period of infrastructure
Production stripping
Infrastructure
52.946
415.00
52.3406
403.00
52.4698
270.00
It can be seen from the calculation that the amount of infrastructure construction of the four steps combined with the stripping process is 1.33 million m 3 less than that of the two steps, which is 1.45 million m 3 less than the single step stripping process.
The four steps are combined into one combined step, and there are two groups. The stripping operation uses a combination of steps along the strike strip. Two excavators are used for trailing work in each combination step. The minimum working distance of the excavator is 200m, and the operation sequence is from top to bottom. The blasting operation was carried out on a wide platform (35 to 45 m) of each group, and the blasting pile was scattered on the first narrow platform (15 m) adjacent to it, and the first excavator was formed after shovel loading on a narrow platform. The wide platform provides a blasting site for the second step, and the second shovel is shoveled on a wide platform formed by the second step. After the first excavator completes the first step, it is transferred to the third step. Correspondingly, the second excavator is dug to the fourth step and then transferred to the fourth step. The second set of combined step operations is identical to the first set of combined step operations. The steps that do not work in the first set of steps serve both as a security function and as a transport road. At this point, each group of combined steps form an independent system of wear, installation, transportation and security. Each advancement width is 20~30m on average, until the final slope, forming a working angle of 23°~25.2°.
Due to the thick cover of the open pit in the west, the amount of stripping is large. In order to reduce the amount of infrastructure construction and maintain the balance of production and stripping, in the fourth year after the production of the open pit in the east, the west open pit stripping work began. When the stope is in the 15th year, the west open pit will continue to be produced.
The perforation operation adopts KQX-150 type DTH drilling rig , medium-deep hole blasting, efficiency 25m/table, perforation 21,000m/set a, total 5 sets, including 1 mining and 4 stripping. Emulsified oil, floating plastic explosive, plastic non-electrical detonation series. Controlled blasting was adopted near the slope, and the perforating equipment was changed from a YQ-150 type down- drilling rig to an 80-100m down-the-hole drilling rig.
The annual mining volume is 360,000 t 3 , and the WK-2 electric excavator is used. The bucket capacity is 2m 3 and the station efficiency is 141,700 m 3 /a. The mining sequence is advanced along the upper disc of the ore body. When the ore body is in the triangle belt, the ore is divided into mining and mining, and the T-140 bulldozer is used with the ZL-50 front-end loading and unloading operation.
Mines peeling rock 1,800,000 m 3, using WK-4A electric excavator bucket capacity 4m 3, 473,400 units efficiency m 3 / a, and with a working ZL-50 type front loader.
The main parameters of the mining and stripping face are as follows:
Working step height / m
10
Working step slope angle / (°)
65~75
Trench minimum floor width / m
20
Minimum working platform width / m
35
Number of steps in the combined step
4
Number of excavators in a group of combined steps
2
Working platform width in combination step / m
35～45
Non-working platform width in combination step / m
15
Work help angle / (°)
23~25.2
Excavator minimum working line length / m
200
Third, the combination of steep step mining technology evaluation
The combination of stepped and steep mining is used to effectively reduce the amount of expansion and balance the production stripping ratio. But at the same time, it also brings the following problems: (1) The main mining and stripping equipment should be adjusted up and down once a year, and the efficiency of the excavator will be reduced by 6% to 10%; (2) After the completion of a stripping strip, the original temporary road disappears. It is necessary to form a new mobile pit line, increase the amount of temporary road construction, reduce the speed of production of automobiles and increase the transportation cost of automobiles; (3) Coordination between the upper and lower working steps in the production process, Strict schedule requirements, complex production management, strict organization of production, and enhanced production and equipment management.