云南怒江地区某钴矿由于高含C、S、As等有害元素,矿石难处理,一直未开发.为了使该钴矿得到开发利用,本研究以含高碳硫砷钴铁精矿为原料,探讨添加碳酸钙焙烧,硫酸浸出的提钴的方法,并制备硫酸钴.原生钴矿中的主要有害元素是碳、硫、砷,其含量分别为0.22％、34.32％、0.72％.在采用高温活化工艺进行焙烧时,硫、砷等有害物质挥发,不仅污染环境,而且有损人们的身体健康.为解决这一缺陷,本方法采用加入添加剂石灰石焙烧工艺,石灰石与钴矿中的硫、砷等有害物质生成钙化合物固定于焙烧料之中,从而避免了其挥发而造成大气污染,碳高温生成二氧化碳挥发出去,每50 g钴样品加入1 g碳酸钙,比焙烧炉700℃C焙烧1h后,焙砂磨细,磨矿细度为-50 μm,硫酸酸浸温度为常温,酸度为0.05％时,钴的浸出率为90.57％.因此,采用“石灰石添加剂焙烧-硫酸浸出-浓缩结晶”工艺,获得钴的浸出率大于90％.新方法具有回收率高,污染小,成本低等优点.%Due to the high content of carbon,sulfur,arsenic and other harmful elements,the ore in Nujiang of Yunnan province was difficult to treat and has not been developed.In order to make the cobalt ore exploitation and utilization,this paper studied the method of cobalt addition with calcium carbonate calcination and sulfuric acid leaching,and prepared cobalt sulfate with high carbon,sulfur,arsenic and cobalt concentrate as raw materials.The main harmful elements in primary cobalt ore are carbon,sulfur and arsenic,in which the contents of carbon,sulfur and arsenic were 0.22％,34.32％ and 0.72％ respectively.In the use of high-temperature activation process for firing,sulfur,arsenic and other harmful substances volatile,not only pollute the environment,but also threaten people's health.In order to solve this problem,the method adopts the additive limestone roasting process,the limestone and the sulfur,arsenic and other harmful substances generated calcium compounds fixed in the roasted material,thus avoiding the volatilization caused by air pollution.Carbon is volatilized in the form of carbon dioxide in high-temperature.every 50 g of cobalt samples added 1 g of calcium carbonate,roasting 1 h at 700℃,calcine grinding fine grinding fineness of-50 μm,sulfuric acid leaching temperature is room temperature,the acidity is 0.05 ％,and Leaching rate of cobalt is 90.57％.Therefore,using‘limestone additive roasting-sulfuric acid leaching-concentrated crystallization’process,the cobalt recovery is more than 90％.The new method has the advantages of high recovery rate,low pollution and low cost.
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