微细粒氧化锰矿综合利用研究
发布时间：2019-06-12 18:36
【摘要】：锰是我国国民经济的重要矿产资源,我国锰矿资源中氧化锰矿石占34.50%,含锰平均品位24.56%,氧化锰矿石中大多含有大量的原生矿泥,表层为氧化矿,通常含泥量比较大,这使得选矿过程中锰的损失比较严重。国内选矿厂堆积了大量的锰矿泥,资源浪费比较严重。本文主要采用湿法浸出技术对微细粒氧化锰矿进行综合利用研究。作为锰行业中最基本的产品,目前国内硫酸锰和碳酸锰的生产大多是采用菱锰矿和软锰矿为原料,用氧化锰矿的浸出液作原料来制取。本试验以广西大新锰矿为研究对象,考察了氧化锰矿还原浸出的最佳工艺条件,对浸出的机理也进行了讨论,并对浸出液开展了一系列的净化试验,研究具有一定创新性。主要以微细粒氧化锰矿为研究对象,硫酸溶液为介质,SO2为还原剂还原浸出微细粒氧化锰矿中的锰。通过考察硫酸用量、浸出时间、液固比、反应温度、搅拌强度、循环浸出次数等反应条件,得到最佳浸出工艺条件为:硫酸溶液浓度0.46 mol/L、浸出时间40 min、液固比4:1、搅拌速率300 r/min、循环浸出次数5次以内、通入SO2流量0.2 L/min,在室温下反应最终氧化锰矿中锰的还原浸出率达到95%以上。本文还采用浓度为30%的H2O2溶液为氧化剂,氧化浸出液中的Fe2+,用氨水调节浸出液的p H值沉淀除铁,除铁率效率到了100%。浸出液进一步用来制取碳酸锰和硫酸锰,其方法为首先对浸出液进行蒸发浓缩,当硫酸锰溶液浓度接近饱和点停止蒸发,接着采用沉淀法制取碳酸锰。以碳酸氢铵做沉淀剂,通过中和沉淀法制备碳酸锰,沉锰率达到99.8%。得到的碳酸锰可与硫酸溶液反应,通过蒸浓法制备硫酸锰产品,沉碳酸锰母液可以蒸发结晶回收硫酸铵产品。最终制得的试验产品均可达到化工行业标准一级品的质量要求。
[Abstract]:Manganese is an important mineral resource in our national economy. The manganese oxide ore in China's manganese ore resource accounts for 34.50%, the average grade of manganese content is 24.56%, and the manganese oxide ore contains a large amount of primary slime, and the surface layer is an oxidized ore. This makes the loss of manganese in the ore dressing process more serious. In the domestic dressing plant, a large amount of manganese ore mud is accumulated, and the resource waste is more serious. In this paper, the comprehensive utilization of micro-fine-grained oxidized manganese ore is studied by wet-process leaching technology. As the most basic product in the manganese industry, the present production of manganese sulfate and manganese carbonate is mainly used as the raw material by using the pyrolusite and the pyrolusite, and the leaching solution of the manganese oxide is used as the raw material. The optimum technological conditions for the reduction and leaching of oxidized manganese ore were studied in this experiment. The mechanism of the leaching was also discussed, and a series of purification tests were carried out on the leachate. The manganese in the micro-fine-grained oxidized manganese ore is mainly used as the research object of the micro-fine-grained oxidized manganese ore, and the sulfuric acid solution is the medium and the SO2 is the reducing agent for reducing the manganese in the fine-grained oxidized manganese ore. The optimum leaching conditions are as follows: the concentration of sulfuric acid solution is 0.46 mol/ L, the leaching time is 40 min, the liquid-solid ratio is 4:1, and the stirring rate is 300r/ min. And the reduction and leaching rate of the manganese in the final oxidized manganese ore is more than 95 percent under the room temperature. In this paper, an H2O2 solution with a concentration of 30% is used as the oxidizing agent, and the Fe2 + in the leaching solution is oxidized, the pH value of the leachate is adjusted by the ammonia water, the iron removal is carried out, and the iron removal efficiency is improved to 100%. The leaching solution is further used for preparing manganese carbonate and manganese sulfate, and the method comprises the following steps of: carrying out evaporation concentration on the leaching solution, stopping the evaporation when the concentration of the manganese sulfate solution approaches the saturation point, and then adopting a precipitation method to prepare the manganese carbonate. And the manganese carbonate is prepared by using the potassium bicarbonate as a precipitating agent, and the manganese carbonate is prepared by the neutralization precipitation method, and the manganese content rate reaches 99.8 percent. The obtained manganese carbonate can be reacted with a sulfuric acid solution, and a manganese sulfate product is prepared by a steam concentration method, and the precipitated manganese carbonate mother liquor can be evaporated and crystallized to recover the sulfuric acid product. The final product can meet the quality requirement of the standard one-grade product in the chemical industry.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD981
本文编号：2498218
[Abstract]:Manganese is an important mineral resource in our national economy. The manganese oxide ore in China's manganese ore resource accounts for 34.50%, the average grade of manganese content is 24.56%, and the manganese oxide ore contains a large amount of primary slime, and the surface layer is an oxidized ore. This makes the loss of manganese in the ore dressing process more serious. In the domestic dressing plant, a large amount of manganese ore mud is accumulated, and the resource waste is more serious. In this paper, the comprehensive utilization of micro-fine-grained oxidized manganese ore is studied by wet-process leaching technology. As the most basic product in the manganese industry, the present production of manganese sulfate and manganese carbonate is mainly used as the raw material by using the pyrolusite and the pyrolusite, and the leaching solution of the manganese oxide is used as the raw material. The optimum technological conditions for the reduction and leaching of oxidized manganese ore were studied in this experiment. The mechanism of the leaching was also discussed, and a series of purification tests were carried out on the leachate. The manganese in the micro-fine-grained oxidized manganese ore is mainly used as the research object of the micro-fine-grained oxidized manganese ore, and the sulfuric acid solution is the medium and the SO2 is the reducing agent for reducing the manganese in the fine-grained oxidized manganese ore. The optimum leaching conditions are as follows: the concentration of sulfuric acid solution is 0.46 mol/ L, the leaching time is 40 min, the liquid-solid ratio is 4:1, and the stirring rate is 300r/ min. And the reduction and leaching rate of the manganese in the final oxidized manganese ore is more than 95 percent under the room temperature. In this paper, an H2O2 solution with a concentration of 30% is used as the oxidizing agent, and the Fe2 + in the leaching solution is oxidized, the pH value of the leachate is adjusted by the ammonia water, the iron removal is carried out, and the iron removal efficiency is improved to 100%. The leaching solution is further used for preparing manganese carbonate and manganese sulfate, and the method comprises the following steps of: carrying out evaporation concentration on the leaching solution, stopping the evaporation when the concentration of the manganese sulfate solution approaches the saturation point, and then adopting a precipitation method to prepare the manganese carbonate. And the manganese carbonate is prepared by using the potassium bicarbonate as a precipitating agent, and the manganese carbonate is prepared by the neutralization precipitation method, and the manganese content rate reaches 99.8 percent. The obtained manganese carbonate can be reacted with a sulfuric acid solution, and a manganese sulfate product is prepared by a steam concentration method, and the precipitated manganese carbonate mother liquor can be evaporated and crystallized to recover the sulfuric acid product. The final product can meet the quality requirement of the standard one-grade product in the chemical industry.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD981
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，本文编号：2498218
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