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Rare earth concentrate pellets prepared EAF removal of iron and slag fine rare earth phosphate, an important technical indicators slagging rate, i.e. the amount of slag consumption per unit of rare earth concentrate pellets are output. The slag formation rate of the grade rare earth concentrate pellets is generally 70% to 80%.
Another important technical indicator is the recovery rate of rare earths. The level of rare earth recovery reflects the level of production technology and operation level. When the rare earth concentrate slag is prepared by de-ironing and dephosphorization of the Baiyun Ebo rare earth concentrate pellet arc furnace, the rare earth recovery rate is above 80%.
The chemical composition of the grade rare earth concentrate pellets and slag in Baotou is shown in Table 1. The distribution ratios of the main elements in the slag and iron phase of the dephosphorization and dephosphorization process are listed in Table 2. The technical and economic indicators of production are listed in Table 3. .
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Table 1 Chemical composition of grade rare earth concentrate pellets and de-ironing slag : %
raw material name
REO
TFe
MnO
P 2 O 5
CaO
CaF 2
SiO 2
MgO
TiO 2
BaO
Al 2 O 3
Pellet
Iron slag
29.54
34.40
9.32
0.27
0.86
0.15
7.05
0.34
2.10
2.80
23.40
27.68
8.76
13.36
0.66
0.87
0.42
0.14
6.39
8.23
1.21
1.39
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      Table 2 The main elements of the iron and phosphorus removal process in the distribution of slag and iron phase engineering units:
project
RE
Fe
P
Mn
Ti
Slag phase
Iron phase
Loss rate
86.00
0
14.00
2.20
96.50
1.30
3.15
92.18
4.67
12.54
86.73
0.73
40.28
59.31
0.41
Table 3 technical indicators of electric furnace de-ironing
Raw material consumption / (kg / t slag )
Power consumption / (kW · h / t slag )
Slag formation rate /%
Rare earth recovery rate /%
Concentrate pellet
Coke
Ferrosilicon
1350
125
30
1020
74
86