Method for drying and prereducing laterite-nickel ores
A laterite nickel ore and drying technology, applied in the field of metallurgy, can solve the problems of large quantity, low thermal efficiency, large investment, etc., and achieve the effects of simple process, easy operation and low investment.
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Embodiment 1
[0016] Embodiment 1: the steps are as follows:
[0017] A. The chemical composition of the laterite nickel ore used is as follows:
[0018] the element
Ni
co
FeO
MgO
Al2O3
SiO2
CaO
Content%
1.03
0.039
17.22
27.3
4.84
35.72
0.32
[0019] The ore directly extracted from the stope has a water content of 25%, and the blocky ore > 100mm is removed by a strip sieve (crushed by a crusher < 100mm and then enters the vertical mill), and the underscreen material enters the vertical mill for drying and crushing.
[0020] B. Use the 3-stage suspension drying and calcining device to output the flue gas with a temperature of 300°C into the vertical mill for drying. After the vertical mill is crushed, the particle size of the material is 0.2mm and the moisture content of the material is 10%. After being collected by a cyclone and a bag filter, it enters 3 Level suspension drying calciner.
[0021] ...
Embodiment 2
[0023] Embodiment 2 steps are as follows:
[0024] The first step is the same as step A of Example 1.
[0025] A. Use the 5-stage suspension drying and calcining device to output the flue gas with a temperature of 250°C into the vertical mill for drying. After the vertical mill is crushed, the particle size of the material is 0.6mm and the moisture content of the material is 15%. Level suspension drying calciner.
[0026] B. In the 5-stage suspension drying and calcination device, the material and the high-temperature flue gas produced by pulverized coal combustion with a temperature of 1100 ° C are subjected to countercurrent suspension heat exchange. The material residence time is 4 minutes, and the material output from the fifth-stage suspender with a temperature of 750 ° C enters In the pre-reducer, the flue gas with a temperature of 250°C from the first stage enters the vertical mill.
[0027] C. Spray coke powder with a particle size of <0.1mm accounting for 3% of the ...
Embodiment 3
[0028] Embodiment 3 steps are as follows:
[0029] The first step is the same as step A of Example 1.
[0030] A. Use the 7-stage suspension drying and calcining device to output the flue gas with a temperature of 200°C into the vertical mill for drying. After the vertical mill is crushed, the particle size of the material is 0.8mm, and the material moisture is 17%. It is collected by a cyclone and a bag filter and then enters the 7 Level suspension drying calciner.
[0031] B. In the 7-stage suspension drying and calcination device, the material and the high-temperature flue gas produced by the combustion of coal powder are subjected to countercurrent suspension heat exchange. The material residence time is 6 minutes, and the material output from the seventh-stage suspender with a temperature of 800 ℃ enters In the pre-reducer, the flue gas with a temperature of 200°C from the first stage enters the vertical mill.
[0032] C. Spray carbon black powder accounting for 1.5% of...
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