Efficient coal derived pyrite dry-method enrichment process and system

Abstract

The invention belongs to mineral processing separation processes and systems, and relates to an efficient coal derived pyrite dry-method enrichment process and a system. When pyrite is inlaid in a coarse aggregate manner and the degree of dissociation is high, no breaking operation is needed. A dry-method dense medium fluidized bed separation machine or a composite dry-method separation machine and a vibration fluidized bed separation machine are combined with the enrichment process. When the disseminated grain size of pyrite in high-sulfur gangue is lower than the fine degree of dissociation, breaking and dissociation operation is carried out on samples, and the vibration fluidized bed separation machine is adopted for carrying out enrichment on brasses in fine-grain high-sulfur gangue. Gangue materials of +6 mm in a pyrite buffer bin are recycled by the dry-method dense medium fluidized bed separation machine and the composite dry-method separation machine and enter the separation machine through a feeder and a belt conveyor, high-density pyrite enters the bottom of a bed layer to be separated from gangue, concentrates and tailings enter a concentrate bin and a tailing bin respectively, the concentrates are pyrite, and the tailings are gangue. The process is simple in procedure, reasonable in technical path, large in handling capacity and stable in running, and running cost is effectively reduced.

Description

technical field [0001] The invention relates to a mineral processing and sorting process and system, in particular to a high-efficiency coal-measure pyrite dry enrichment process and system. technical background [0002] As the largest industrial waste in my country, coal gangue accounts for about 25% of the industrial waste discharged in my country every year. With the further increase of my country's coal mining volume and coal selection rate, it is estimated that the discharge of coal gangue will reach more than 800 million tons in 2015, and the cumulative storage will be close to 4.5 billion tons. Minerals in coal gangue often undergo chemical reactions under unfavorable natural conditions such as sunlight, rain, and weathering, producing a large amount of acidic water or ionized water carrying heavy metals, which seriously pollutes the ecological environment of the mining area. In addition, gangue often contains pyrite and carbon-containing minerals, and there is a hid...

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Problems solved by technology

[0004] At present, the enrichment of pyrite in gangue is mainly based on wet separation, and the sulfur element in pyrite is easily oxidized when it meets water, causing spontaneous combustion and other phenomena. After separation, the concentrate needs to be dried and dehydrated. The production cost is high; at the same time, water resources are increasingly scarce, and all countries are advocating water conservation. my country began to carry out national water resources strategic planning in 2010, and clearly put forward control requirements for the use of water resources. Therefore, we urgently need to study water-free environments. beneficiation process

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