Alluvial Gold Dressing Equipment
The STL water-jacketed Gold Concentrator is a kind of gravity separation equipment. It was developed by Changchun Gold Research Institute Co., Ltd. in 1985 and entered the market. At present, it has been used in many domestic and foreign companies. It is suitable for the recovery of single gold in placer gold, vein gold mines and polymetallic mines, instead of mercury plate operations. The addition of large single gold particles in the collected ore before flotation can further increase the recovery rate of gold mines, and it can also be used from gold-bearing mines. Separate single gold from flotation gold-copper concentrate and flotation gold concentrate.
The main indicators of this series of equipment basically reach the level of similar international products (such as Nielsen gold selectors, etc.). Compared with similar equipment at home and abroad, this series of equipment has the advantages of high cost performance, easy operation, and low maintenance costs.
Alluvial Gold Dressing Equipment,Alluvial Gold Mining Equipment,Gold Extraction Process,Alluvial Gold Equipment Changchun Gold Research Institute Co.LTD , https://www.changchunmachine.com
In addition to beryl, beryllium dressing stone workers to hydroxyl silicon, beryllium silica stone, chrysoberyl, garnet and sun flowers stone beryllium minerals different degrees conducted research and other mineral processing methods, in which a hydroxyl silicon beryllium stone , silicon vermiculite and gold emeralds have been studied more.
1959 Nevada found a lead-silver mine is rich in hydroxyl silicon and silicon stone beryllium beryllium minerals, followed by a small-scale test and continuous test face. 1964 R. The article by Huffins introduces the continuous test situation: the test is carried out with three samples with different grades. The main gangue minerals in the sample are quartz , calcite , mica and feldspar , containing BeO 0.47%~4.7%, each sample The composition is shown in Table 1.
Table 1 Mineral composition of three bismuth samples
Sample
Grade %BeO
Mineral content, %
Hydroximelite
Silicon meteorite
Beryl
quartz
Calcite
fluorite
Feldspar
Mica
Stacked mine (1)
0.47
0.9
0.3
0
18
40
16
7
Stacked mine (2)
0.28
0.8
1.0
mark
25
15
twenty one
10
High grade mine
4.7
mark
11
0
35
5
5
A continuous test with stacked ore (2) obtained a bismuth concentrate with a grade of 21% BeO with a recovery of 78.3%. The test procedures and indicators are shown in Figure 1 and Table 2, respectively.
Table 2 Continuous test indicators of stacked ore (2)
product name
Yield%
grade,%
Recovery rate,%
BeO
WO 3
BeO
WO 3
Antimony concentrate
2.84
21.00
0.29
78.3
8.2
Antimony concentrate (1)
1.66
24.8
0.24
54.1
4.0
Antimony concentrate (2)
1.18
15.6
0.36
24.2
4.2
Tungsten concentrate
0.08
33.70
26.9
Middle mine
0.18
1.70
3.1
Tailings
96.90
0.17
0.064
21.7
61.8
Feed mine
100.00
0.76
0.10
100.0
100.0
Figure 1 Continuous test (23kg / h) process
(2) different from the bulk ore bulk ore containing 1% pyrite (1), so that the front portion of the flow of xanthate plus pyrite float first, then selected from beryllium. The test results obtained a bismuth concentrate with a grade of 12.2% Be0, and the recovery rate was 75%.
The focus of the continuous test of high-grade samples is to produce high-quality concentrates. The grade of antimony concentrate obtained by experiment is 25% BeO, and the recovery rate is 85.5%.
Test that: (1) phosphate sodium hexametaphosphate stirring time of 20 to 30 minutes is appropriate, although able to increase the recovery time is too long, but the concentrate grade decreased; (2) adjusting the tub than six small-volume series The effect of using a single large volume bucket is good; (3) the combination of NaF and sodium hexametaphosphate can better inhibit calcite and fluorite than alone; (4) silicon vermiculite is easier to float than hydroxysilicon vermiculite, 20-74 Niobium-grade niobium minerals are easier to float than other grade-grade niobium minerals (see Table 3).
Table 3 Distribution of antimony minerals in flotation feeds and tailings
Particle size μm
Feed mine
Tailings
Yield%
Grade %BeO
Distribution rate, %
Yield%
Grade %BeO
Distribution rate, %
Hydroximelite
Silicon meteorite
Hydroximelite
Silicon meteorite
+208
1.6
0.78
20
80
0.5
0.62
50
50
208~147
1.3
0.78
30
70
1.3
0.48
30
70
147~104
3.2
0.74
30
70
3.4
0.36
30
70
104～74
6.4
0.86
30
70
6.5
0.32
70
30
74~20
53.7
0.84
60
40
53.6
0.06
100
0
-20
34.8
0.50
34.7
0.12
total
100.00
0.70
55
45
100.0
0.13
70
30
Before the United States began extracting germanium from hydroxyapatite ore directly using an extraction process in the late 1960s, â€œé“ Resources Company†used a positive flotation process to treat hydroxysiliconite clay minerals to produce low-grade hydroxysilicon germanium. The stone concentrate is then extracted by chemical process. The scale of the flotation plant is 250 tons/day. After the finely ground ore is selected by the flotation, the mica and feldspar are selected. Flotation of hydroxysilicon vermiculite in the machine, the obtained antimony concentrate grade is not high, containing Be03% ~ 7%, the recovery rate of 85%.
The resources of hydroxysilicon meteorite in Spiel Mountain, Utah, USA are very rich. The ore contains Be00.5~1.5%. Due to the extremely fine crystal of hydroxyapatite, it is difficult to be effectively enriched by mechanical beneficiation method. After years of efforts, the researchers of the mining bureau succeeded in developing a "liquid-liquid extraction process" for directly extracting bismuth from ore and using it for industrial production. The success of this process ended the era of beryl as a raw material for bismuth, while at the same time making hydroxy Silicon meteorite - leap into the main raw material. The main processes of the liquid-liquid extraction process are:
1. The mineral powder is mixed with 10% sulfuric acid and stirred. The pH value is maintained at 0.5-1.5. The hydroxysilicon vermiculite is dissolved into barium sulfate salt. After filtration, most of the tailings (ie, silica mud) are discarded.
2. The ruthenium-containing filtrate is extracted with an extractant P 2 O 4 , Be is transferred to the organic phase, and then back extracted with NaOH, and the ruthenium ions react with the lye to form a telluride. Aluminum also enters the stripping solution during this process.
Third, the stripping solution is heated and boiled, and the cerium salt is hydrolyzed to Be(OH) 2 precipitate, and the aluminum salt cannot be hydrolyzed, thereby achieving the separation of Be and Al. If necessary, the hydrolyzed Be(OH) 2 is calcined at 1100 ° C for 2 to 3 hours to obtain cerium oxide having a purity of about 99%.
In Canada, in recent years, Highwood Reso-urces Ltd. is actively developing Thor Lake silicon meteorite resources. The mine is located in the southeastern part of Yellowknife in northwestern Canada. The mine covers an area of ​​7284 hectares (18,000 acres) and is divided into four zones. Drilling work in the second district from 1983 to 1984 has initially identified 1.4700 tons of ore with a grade of 1.4% BeO and 1.3 million tons of ore with a grade of 0.66% Be0. In addition to strontium, the mine also contains important components such as rare earths, strontium , uranium , thorium , strontium and barium . The process tests carried out on the mine have shown that the bismuth fines with a grade of nearly 20% BeO can be obtained, and the recovery rate is 80% to 85%. The mine is actively conducting continuous testing, road construction and further exploration work, and it will soon become another stable raw material base for Brash Wilman.