The new technology of low-grade limonite and limonite rotary kiln magnetic roasting-magnetic separation is to heat the limonite and limonite to a certain temperature and carry out physical and chemical reactions in the corresponding atmosphere. After the magnetization roasting, the magnetic properties of iron minerals are significantly enhanced. The magnetism of gangue minerals does not change much. Various weakly magnetic iron ore can be effectively separated by magnetic separation after magnetic roasting, and the effective separation of iron minerals can be realized.
Process flow: The raw ore and coal are first processed by the crushing system. After screening, the crushed quasi, limonite and bituminous coal are sent to the rotary kiln by the distribution system for magnetization roasting. The roasting heat source is provided by burning natural gas (or pulverized coal) and bituminous coal. After being cooled by water, the roasted products are sent to the magnetic separation workshop for grinding and magnetic separation to produce qualified iron fine powder.
Main technical indicators: Taking the Xinjiang Kezhou Yaxing Mineral Resources Group project as an example, during the trial production of the project, the grade of roasted ore increased by an average of 7.29% compared with the original ore, and the grade of concentrate reached an average of 62.39%. In the analysis of magnetic separator The total recovery rate reached 90.17%. The average processing capacity of the rotary kiln is more than 50.00 tons/unit·hour. From the perspective of technology, the complete set of rotary kiln magnetized roasting equipment can carry out continuous and stable long-term production, and its various indicators are at the leading domestic level.
Xinjiang Kezhou Yaxing Mineral Resources Group Co., Ltd. invested 430 million yuan to build a new beneficiation plant that processes 2 million tons of iron ore per year. The construction period is 12 months and the investment payback period is 4.5 years. , Limonite, 1.1 million tons of iron concentrate with a production level of> 61%, can efficiently utilize low-grade siderite resources with proven reserves of more than 70 million tons and prospective reserves of nearly 100 million tons.
Limonite and siderite are ore types with large reserves. The co-existence with magnetite and hematite accounts for 10% of the total iron ore reserves. The predicted reserves in the main prospecting target areas in the west are more than 5 billion tons, only in Shaanxi, my country. , Xinjiang, Yunnan and other places have individual reserves of nearly 2 billion tons. Russia, Central Asia, and Australia are also rich in reserves of this type of ore. Eastern Europe and Central Asia have proven reserves of nearly 3 billion tons, with potential resources It accounts for more than 37% of the total potential iron ore resources. The magnetic roasting process technology is the only effective method for processing poor and weak magnetic refractory iron ore. This technology can be promoted and applied in such resource-rich areas, so that the previously difficult ore can be efficiently used, and the industrialization prospect is very broad. .
