( 3 ) Technical and economic indicators

Mountain View beneficiation plant technical and economic indicators are shown in Table 8

( 4 ) Production practice of calcined kaolin

In 1982 , China Kaolin Company studied the successful roasting kaolin production technology. A 50t/a test production line has been built. Selected kaolin powder 800 °C The mixture was calcined at a temperature, then subjected to ultrafine grinding with a jet mill and surface-modified with silicone oil. Product technical indicators are shown in Table 9 . The use of calcined kaolin in cable plastics can significantly improve its electrical properties. See Table 10 for the effect.

Table 9   Main technical indicators of calcined kaolin

product code

Physical properties

chemical composition

-2 μ m

Not less than, %

+44 μ m

Not greater than, %

BaiDu

Not less than, %

Hydrophobic

(turbidity) is not greater than

SiO 2

Not greater than, %

Fe 2 O 3

Not greater than, %

Al 2 O 3

Not less than, %

GM 1

65

0 . 3

83

15

53

0 . 5

43

GM 2

55

0 . 4

83

15

53

0 . 5

43

 

Table 10    Performance comparison of cable plastics for calcined kaolin

project

Required index is not less than

Join China Kaolin Company

Calcined kaolin

Join the US roasting kaolin

20 °C Volume resistivity, Ω· m

5 × 10 11

4 . 5 × 10 12

3 . 1 × 10 12

105 °C Volume resistivity, Ω· m

5 × 10 8

1 . 3 × 10 9

7 . 8 × 10 8

Low temperature impact compression temperature ± 5 °C

by

+5-5

+7-3

2 , Zhanjiang Kaolin Soil Concentrator

(1) Raw ore properties

The ore is from the mountainous kaolin mining area of ​​Zhanjiang City. It is a weathered residual kaolin deposit. The kaolin industrial type is sandy. The ore size is less than 30mm , moisture 24 ~ 25% . The mineral composition of the ore is listed in Table 11 , and the chemical composition is shown in Table 12 . The main minerals are kaolinite, halloysite and hydromica , followed by feldspar , quartz and muscovite. The harmful impurities are iron- titanium minerals, iron minerals are mainly hematite, followed by limonite, siderite and titanium. titanium minerals are mainly white, followed by ilmenite and rutile. Ore less than 44 μ m in an average yield of 41.61%, which accounts for 48.08% kaolinite, mica, 33% water; less than 20 μ m yield of 32.74%, which accounts for 83.45% kaolinite, mica, accounting for 13.81% of water; less than 2 μ m in a yield of 10.03%, the stripping can be enhanced yield of less than 2 μ m. In addition, a small amount of ore fine particles smaller than 0.2 μ m.

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