Preparation process of carbon-containing pellets with laterite nickel ore
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摘要: 以紅土鎳礦作為原料,煤粉作為還原劑,氧化鈣作為熔劑,配加一定量的黏結劑和水,經對輥壓球機壓制成含碳球團.對紅土鎳礦的成球特性進行了研究,考察了還原劑、水分和黏結劑等因素對球團強度的影響.結果表明:紅土礦粉本身具有較好的成球特性,在不加入黏結劑的條件下,球團仍具有一定的強度;較細粒度的煤粉會降低球團的強度,適宜含量的較粗粒度的煤粉能提高球團的強度;隨著水分加入量的提高,球團的抗壓強度逐漸提高,當水的質量分數為18%時,其抗壓強度達到最大值,若水分繼續增加,抗壓強度呈現下降的趨勢;球團的落下強度隨著水量的增加而升高;隨著膨潤土用量的增加,球團強度有明顯的提高,當膨潤土的質量分數為2%時球團強度達到最大值,隨著膨潤土用量的進一步提高,球團強度略微下降,且膨潤土中含有較高含量的SiO2和Al2O3,會降低球團有用元素的品位,因此用量不宜過高.Abstract: Laterite nickel ore as raw materials, pulverized coal as a reductant, CaO as a flux, binder and water were pressed into carbon-containing pellets by using a twin-roller ball press. The pelletizing characteristic of laterite nickel ore was studied and the effects of some factors such as the reductant, water amount and binder on the pellet strength were investigated. It is shown that laterite nickel ore has a better pelletizing property and the pellets still have a certain strength without adding any binder. Fine-grained coal reduces the pellet strength but an appropriate content of coarse-grained coal can improve it. The compressive strength of the pellets gradually increases with the water addition amount increasing and reaches the maximum when the water addition amount comes up to 18%; however, if the water addition amount continues to increase, the compressive strength shows a decreasing tendency. The falling strength of the pellets gradually increases with the increase of water addition amount. When the bentonite addition amount increases the pellet strength gradually increases and reaches the maximum at the bentonite addition amount of 2%; however, if the bentonite addition amount continues to increase, the pellet strength declines slightly. What is more, bentonite contains higher contents of SiO2 and Al203, which can reduce the grade of useful elements in the pellets, so the addition amount of bentonite should not be too high.
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Key words:
- laterite nickel ore /
- ore pellets /
- direct reduction process /
- compressive strength
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