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Lime pellets and preparation method thereof
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A technology of pelletizing and lime, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as large losses, and achieve the effects of good formability, good air permeability and high air permeability.
Active Publication Date: 2018-03-23
云南永昌硅业股份有限公司
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Problems solved by technology
The industrial silicon pellets produced at this stage are carbonaceous pellets with reducing effect. In the production of industrial silicon, a slagging agent needs to be added from the material batch to increase the fluidity of the slag. At present, lime (calcium oxide ), manufacturers usually add the two in a certain proportion from the batch, because the lime powder is relatively large, and the loss is large before entering the furnace, so it needs to be processed before entering the furnace
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Embodiment 1
[0036] Utilize lime, petroleum coke powder and GY type coal pellet dry powder binding agent to prepare the step of lime pellet as follows:
[0037] (1) Watering and fermenting quicklime makes it powdery;
[0038] (2) Mix the lime processed in the previous step with petroleum coke powder and GY-type coal pellet dry powder binder at a mass volume ratio of 30:60:10, and transport the matched materials to the mixer mill through the belt conveyor system Mix and grind for 5-10 minutes;
[0039] (3) When the color of the mixed and milled material changes from light to dark and small particles form agglomerates, put the material into the chain bucket conveyor and transport it to the high-pressure briquetting machine for cold pressing to obtain wet balls;
[0040] (4) Screen out the qualified wet pellets, enter the air-drying system by the belt conveyor, and obtain the finished lime pellets, which are transported to the finished product stacking point.
Embodiment 2
[0042] Utilize lime, petroleum coke powder, washed coal powder and GY briquette dry powder binder to prepare the steps of lime pellets as follows:
[0043] (1) Watering and fermenting quicklime makes it powdery;
[0044] (2) Mix the lime processed in the previous step with petroleum coke powder, washed coal powder, and binder at a mass volume ratio of 30:45:15:8, and transport the matched materials to the mixing chamber through the belt conveyor system. Mix and stir in the mill for 5-10 minutes;
[0045] (3) When the color of the mixed and milled material changes from light to dark and small particles form agglomerates, put the material into the chain bucket conveyor and transport it to the high-pressure briquetting machine for cold pressing to obtain wet balls;
[0046] (4) Screen out the qualified wet pellets, enter the air-drying system by the belt conveyor, and obtain the finished lime pellets, which are transported to the finished product stacking point.
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Abstract
The invention discloses a lime pellet and a preparation method thereof. The preparation method comprises the steps of adding water into unslaked lime to perform fermentation treatment to obtain powder slaked lime; adding carbon powder and adhesive into the powder slaked lime and performing mixing to obtain first mixture; performing agitation treatment in a mixing mill to enable the color of the first mixture to become dark from light until small particle pellets appear; performing cold press molding treatment to the first mixture subjected to the agitation treatment in the mixing mill to obtain wet pellets; performing air-drying treatment to the wet pellets to obtain the lime pellets. The lime pellets prepared by using the method have the advantages of good formability and high air permeability.
Description
technical field [0001] The invention relates to the field of metallurgy, in particular to metallurgical pellets, more specifically to lime pellets and a preparation method thereof. Background technique [0002] With the comprehensive recycling of resources and the increasingly stringent requirements for fine materials in modern industrial silicon production, pellets play an increasingly important role in the effective recycling of powder resources and industrial silicon production, and have become an indispensable industrial silicon raw material. In the process of expanding pellet production from single treatment of reducing agent powder to multiple reducing agent raw materials, pellet products have also been widely used in industrial silicon production. The industrial silicon pellets produced at this stage are carbonaceous pellets with reducing effect. In the production of industrial silicon, a slagging agent needs to be added from the material batch to increase the fluidit...
Claims
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