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A chlorite-monohydrate soft bauxite bauxite ore in foreign countries contains 41.93% Al 2 O 3 , 10.68% SiO 2 and 30.6% Fe 2 O 3 . After sieving and washing, the coarse grade (-50mm+3mm) is subjected to selective crushing and grading, the coarse fraction is low aluminum-silicon ratio product, and the fine grade (less than 0.4mm) can be used to remove impurity iron by selective flocculation. The process flow is shown in Figure 1b. The aluminum concentrate can be obtained with Al 2 O 3 52.3%, SiO 2 8.43%, Fe 2 O 3 8.43%, aluminum recovery rate 73.3%, aluminum-silicon ratio 6.2 sorting effect, see Table 1.
Table 1 鲕 chlorite - boehmite bauxite ore selection index 
鲕 chlorite-monohydrate soft bauxite bauxite technology
Characteristics of the fine ore is hematite and chamosite closely with a boehmite, a partially enriched boehmite bauxite is easily dissociated upon crushing, and fine iron minerals in the fine level The particles are dispersed.
product name
Yield/%
grade/%
Recovery rate/%
Aluminum to silicon ratio
Al 2 O 3
SiO 2
Fe 2 O 3
Al 2 O 3
SiO 2
Fe 2 O 3
Bauxite concentrate
Low aluminum to silicon ratio product
High magnesium product (flocculation overflow)
Raw ore
59.2
18.0
22.8
100.0
52.3
33.99
21.95
41.93
8.43
13.28
14.45
10.68
8.43
13.28
14.45
30.3
22.35
32.12
50.77
30.6
73.8
14.6
11.6
100.0
46.7
22.4
30.9
100.0
6.2
2.6
1.5
3.9
Figure 1 Flow chart of the selection process of boehmite bauxite
8a-a kaolinite; b-a chlorite