冷壓制備工業(yè)硅生產(chǎn)用碳質(zhì)還原劑球團及成型機理研究
[Abstract]:Due to its low ash content and high porosity, charcoal is the best carbonaceous reducing agent in industrial silicon production. With the increasing shortage of forest resources and the improvement of human environmental awareness, the price of charcoal increased even in the charcoal plant, which has a serious effect on the industrial silicon production. Therefore, it is urgent to find a carbonaceous reducing agent to replace the charcoal. The carbon reducing agent for production has the following requirements: chemical composition requires high fixed carbon, low moisture, moderate volatilization, low ash content (ash content 5%, Fe content 0.2%), a certain mechanical strength, suitable size composition, high resistivity and chemical reaction ability. This paper is provided in the coal and production of the surrounding area of Yunnan because of the high resistivity and chemical reaction ability. In addition to chemical composition, other properties are reflected by the compressive strength of the raw ball, the compressive strength of the dry ball, the crushing rate, the heat strength and the porosity. The ash content of the bituminous coal is 16.09%, which needs to be pretreated. The chemical composition meets the requirements of industrial silicon production without preprocessing. In this paper, the pretreatment of bituminous coal was first studied, and the raw materials of carbon reduction agent pellets used in industrial silicon production were selected. The pretreatment process of bituminous coal was divided into two stages of flotation and acid leaching. The optimum flotation process parameters were as follows: the three coarse two finish closed circuit experiment process was selected. The amount of the defoaming agent is 120g/t, the amount of the collector diesel oil is 600g/t, the amount of the inhibitor glass is 2300g/t. after flotation, the ash content is 4.68%, the content of the Fe element is 0.32%. It can not meet the requirement of the chemical composition of the carbon reducing agent in the industrial silicon production. It needs further deashing and removing iron. The process of acid soot deashing and removing iron is 4mol/L hydrochloric acid. The leaching time is 60 C, the leaching time is 60min, the liquid and solid ratio is 5:1, the waste acid is recycled 3 times. The ash content of the refined coal after acid leaching is 3.89%, the content of Fe is 0.17%, which meets the requirement of the chemical composition of the carbonaceous reducing agent in the industrial silicon production. The powder is used as the raw material for the production of carbon reducing agent pellets for industrial silicon. Secondly, the cold press molding process is studied with R as a binder. The optimum process parameters are as follows: the molding pressure is 25MPa, the concentration of NaOH solution is 4.8mo1/L, the content is 8%, the micro silicon powder is added to 8%, the washed coal is coke: charcoal is 9.3:8.8:1 (quality certain), The maximum grain size range of the formed particles is 3.3mm to 4.75mm, and the proportion is 60%. Under the R binder content 3.5%., the pellet has the best performance, the ball compression strength is 698.0N, the dry ball compressive strength is 6985.0N, the crushing rate is 93.68%, the heat strength is 55.25%, and the porosity of 14.69%. production shows that this pellet can be used in industrial silicon. Production, but the condition of the furnace is poor, the performance of pellet needs to be improved. This paper takes this ball as a reference. Again, the effects of coal tar pitch, NaHA (humic acid sodium), sodium lignosulfonate, water glass and starch binder (starch A, starch B, starch C and starch D) on pellet performance are studied. The performance of pellets prepared by starch D is the best and comprehensive examination The content is 1.96%. At this time, the compressive strength of the ball is 873.2N, the compressive strength of the dry ball is 8091.4N, the crushing rate is 99.21%, the heat strength is 94.44%, the porosity is above 5.86%., and the other properties except the porosity are all satisfied with the production requirements. Therefore, on this basis, the hollow microspheres, calcium oxide and biological materials of non biomass pore making agents are studied on this basis. The effect of the porous rice husk, corn straw, wheat straw, rice straw and wood chips on the pellet performance was found. The results showed that the Pelletizing Properties of the pellets prepared by other substances except the hollow microspheres could not meet the industrial silicon production requirements. When the water rice straw was selected as the pore making agent, the optimum content was 2.5%. When the maximum particle size is 4.75mm and the distribution modulus is 0.5, the ball has the best performance. Under this condition, the compressive strength of the ball is 4700.2N, the compressive strength of the dry ball is 9536.1N, the crushing rate is 99.07%, the heat strength is 96.21%, the porosity is 30.78%, which can meet the requirements of the industrial silicon production. In addition, the water content, wetting medium and bond during the cold pressing process are studied. The influence mechanism of agent, pore forming agent, molding pressure and material size composition on pellet properties is obtained. The following conclusions are obtained: in the process of cold pressing, when the NaOH solution is the wetting medium, the new chemical bonds produced by the reaction of NaOH and starch D increase the binding capacity of the particles. The binding force between the particles and the binder is the mechanical binding force and the physical and chemical binding force. As a result of the comprehensive effect, the effect of mechanical binding force is greater than that of physical chemical binding force. The main reason for the increase of the porosity of rice straw in the pellet is due to its small density and the characteristics of plastic deformation after the external force is disappearing. When the particle size composition of the raw material is in line with the GGS particle size characteristic equation, the best performance of the pellets is the best. The pellets prepared under the best technological parameters are put into the 25.5MVA semi closed rotary mine hot stove. The analysis of industrial production data shows that the pellet can meet the requirements of industrial silicon production, and the optimum replacement amount is 80%..
【學位授予單位】:昆明理工大學
【學位級別】:博士
【學位授予年份】:2016
【分類號】:TN304.12
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