1. State key laboratory of high aluminium coal
Comprehensive utilization and industrialization of high aluminum coal ash
Sun Junmin
State key laboratory of high aluminium coal 1

2. Outline Resources Characteristics Industry Practice
Circular Development

3. Geological conditions：smooth crustal movement warm and humid climate
The symbiosis and associated relationship between coal and ferro-aluminium
Geological conditions：smooth crustal movement warm and humid climate
North China basin：iron—aluminium—coal (associated)
Erdos basin：symbiosis

4. Bauxite distribution in North China basin

5. Zhunger Heidaigou open coal mine
Neopaleozoic high aluminium coal resources in Erdos basin
In mid and west Inner Mongolia, people uses coal-aluminium-gallium mine to generate thermal power. The coal contains abundant boehmite and Kaolinite which are aluminium-rich minerals.
There are 31.9 billion tons of high aluminium coal resources in Inner Mongolia and about 10 billion tons are high aluminium fine coal, which is an important backup resources in China.
Zhunger Heidaigou open coal mine

6. Discovery of high aluminium coal ash
In 2003, after Tuoketuo Power plant I went into operation, the high aluminium fine coal was discovered, a precious recycled aluminium mineral, in flue gas and dust.

7. Formation and features of high aluminium coal ash
Al2O3=48%
SiO2=40%
amorphous state SiO2 accounts for 20%
Crystal SiO2 accounts for 20%
porzite aluminium oxide
Glass phase(SiO2)
Ti Ga RE
boehmite/kaolinite
Ti Ga RE

8. Outline Resources Characteristics Industry practice
Circular development

9. Technical line and industry direction
技术开发
Al-Si-Ti initial alloy
(Al-Si-Fe alloy)
Al-Si-Ti alloy
High aluminum coal ash
alumina
Chemical filler
Calcium silica slag-cement
Silica pigment
Molecular screen
Liquid aluminium
Aluminum ingot
Aluminum plate
Aluminum strip
Aluminium foil

10. Technical line (substance evolution and circular economy)
coal power non-ferrous .
smelt
burn
aluminium-rich coal high aluminium fine coal Al-Si alloy

11. Al-Si alloy smelting

12. Technology of extracting alumina from coal ash
Pre-desiliconization—soda lime sintering (Datang)
Limestone sintering (Mengxi)
Acid process (Shenhua)
Ammonia process (China Huaneng Group,China Huadian Corporation)

13. Technology integration innovation.
fine coal pre-desilication
Soda lime sinterning process
Datang International
technology = +
similar to Bayer method
innovative
mature
sinterning

14. Demonstration project
High aluminium fine coal demonstration project with capacity of 200,000tpy---Datang International

15. Transport technology and equipment of coal ash

16. Fine coal pre-desiliconization.
2NaOH+SiO2（amorphous state）=Na2SiO3+H2O
Double pipe heating + thermal insulation tank——Bayer process，safe

17. Active calcium silicate high filler paper-making technology
microstructure comparison of finished paper
Active calcium silicate product—comb structure inside
←high filler paper
Traditional paper↓
Currently, the laboratory has developed kilogram paper that could meet national standard, in which the content of new calcium silicate filler has been up to 50-60%.

18. Industrialized test of high filler paper
抄造系统
Papers
filler
Disperse system
Papermaking system
Printing system
presswork

19. silicate whisker

20. calcium silicate
heat insulator

21. Desiliconisation coal ash produces raw slurry

22. clinker sintering——rotary kiln.

23. Alumina extracted from coal ash
Aluminum hydroxide output——pan filter

24. Major products—metallurgy alumina
Sand alumina microstructure
Alumina element
National standard:
YS/T 274－1998
Al2O3
(no less than)
Impurity content, no more than
SiO2
Fe2O3
Na2O
98.4
0.04
0.03
0.60
A Henan-based company
98.6
0.027
0.57
Renewable resources company
99.7
0.014
0.17

25. Technology process of extracting gallium from high aluminium coal ash

26. Calcium silicate slag

27. Application of calcium silicate slag
Calcium silica slag’s three major uses are: cement raw material after dealkalize, road material and concrete admixture, and green construction material like calcium silicate board with microporous.
C2S

28. Enlarge Normal concrete Calcium silicate slag concrete
Comparison of normal concrete and calcium silicate slag concrete after paved one month
Enlarge
Normal concrete
Calcium silicate slag concrete
Comparison of normal concrete and calcium silicate slag concrete after paved one and half year

29. Heavy-load freeway

30. 30

31. Switchgrass to solve coal base solid waste
Soil
construction
Energy
plant
Desertification
control
Coal solid waste
Circular economy
Coal gangue、fine coal and Al-Si-Ca slag
（switchgrass）

32. Outline Resources characteristics Industry practice
Circular development

33. Circular economy development in Western China
Alumina
Development
of high
aluminium
coal
resources
Non-ferrous metal
products
power
High aluminium
fine coal
Al-Si alloy
Chemical
products
Chemical filler
cement
Construction
products
Chemical
industry
Calcium silica slag
(byproduct)
PVC
carbide slag
desulfurizer
Gypsum
board 33

34. Energy conservation and pollution reduction
Co-generation technology (fine coal)
Traditional Bayer technology (natural mineral)
Solid waste consumption
High aluminium fine coal: 2.4t
Natural mineral consumption
bauxite: 2.0t
Carbide slag:0.9t
Lime stone: 2.4t
Emission reduction
Reduce emission of CO2: 0.7t
Emission
CO2:1.4t
Reduce red mud：2.0t
Red mud：1.5t
Reduce destruction of natural forest
0.88 m2
Vegetation destruction

35. Inorganic transformation and circular economy of coal
Coal（1）——power（2）——clinker（3）——non-ferrous（3）——chemical（4）——papermaking（5）——rubber and plastic（6）——construction material（7）——energy saving material（8）——ecomaterials（9）——ecological restoration（10）

36. Let us work hand in hand to create a brilliant tomorrow.