A method for separating and extracting valuable components of boron-magnesium-iron symbiotic ore

Abstract

The invention discloses a method for separating and extracting valuable elements from boron-magnesium-iron paragenic ore. The method comprises the following steps: sufficiently and uniformly mixing crushed boron-magnesium-iron paragenic ore and reduced coal powder, performing selective reduction, grinding and separating, thereby obtaining directly reduced iron and magnetic-separation tailings; performing flotation separation on the magnetic-separation tailings to remove redundant carbon, and performing steps of sulfuric acid leaching, washing alkaline leaching deposition, low-temperature crystallization separation and high-temperature crystallization separation, thereby obtaining white carbon black, boric acid and magnesium sulfate monohydrate respectively. In the whole process, residual coal powder, acid liquids and alkali liquids can be all circulated and utilized, and the method has the characteristics of high iron, boron, magnesium and silicon separation efficiency, high recycling rate and comprehensive resource utilization, and has important significance in developing the boron-magnesium-iron paragenic ore resource which is rich in reserves in China.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of metallurgical resources, and specifically relates to a method for separating and extracting valuable components from boron-magnesium-iron symbiotic ores based on carbothermal reduction and wet leaching separation and extraction methods to realize comprehensive utilization of boron-magnesium-iron symbiotic ores . Background technique [0002] In recent years, the rapid economic development has promoted the sustained and high-speed growth of my country's iron and steel industry, making the contradiction between supply and demand of iron ore resources increasingly prominent. However, there are few rich iron ores in my country, more lean ores, high-quality and easy-to-select iron ore resources are gradually decreasing, and the domestic iron and steel industry has to rely more on imported iron ore to meet production needs. Since 2003, my country's dependence on imported iron ore h...

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Problems solved by technology

[0014] However, the above-mentioned methods for the comprehensive utilization of boron-magnesium-iron symbiotic ores mainly have the following problems: (1) Some methods have higher requirements on the performance of raw materials, such as the need for extremely fine particle size of raw materials, or the need to use boron-containing iron concentrate or boron concentrate as raw materials, or have higher requirements on the grade of raw ore ferroboron, thus limiting the range of raw materials; (2) Some methods need to go through multi-step separation, multiple grinding or multiple addition of collectors and regulators and other raw materials, the process The process is more complicated; (3) Some methods need to use expensive binders to ensure the strength of the pellets into the furnace, which increases the cost sharply. At the same time, the inorganic binders contain Na, K, Cl and other impurity elements, and the organic binders do not have High-temperature strength, and the composite binder contains high Si elements, and the ash content increases; (4) Some methods use high-concentration inorganic acids or relatively expensive organic acids to ensure the leaching rate, which significantly increases the production cost, especially the wet method. When dealing with boron-magnesium-iron ore raw ore, not only the leaching effect is not good due to the existence of a large amount of iron, but also requires high equipment, which limits its application and promotion; (5) the methods proposed so far have not achieved boron-magnesium-iron The comprehensive utilization of boron, magnesium, iron and silicon in raw ore has caused a huge waste of resources

[0015] Therefore, due to the complex structure of boron-magnesium-iron symbiotic ores and many symbiotic minerals, it is difficult to separate them by using the above-mentioned conventional methods. So far, there is no mature process that can comprehensively utilize boron-magnesium-iron symbiotic ores. It is necessary to carry out more in-depth research on this

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