Please select the most similar patent number from A, B, C and D. Which number is?
An iron fine removal and sorting system for magnetic hard rocks. The system comprises a feeding system (1-1), a hard rock screening system (1-2), a whole hard rock sorting system (1-3), a hard rock coarse sorting system (1-4), a hard rock fine sorting system (1-5), and an automatic hard rock return system (1-6). The hard rock screening system (1-2) can conduct size grading on hard rocks. Materials containing whole balls and crushed balls are subjected to whole ball iron removal and sorting. The hard rock coarse sorting system (1-4) can sort out all ferrous metal. The hard rock fine sorting system (1-5) can accurately separate the sorted metallic iron from the hard rocks. The whole sorting system uses the low-energy-consumption energy saving technology. A PLC-controlled pneumatic push rod (5-4) is used in the separation technology, the precision of an execution mechanism (5-3) is high, and the iron piece separation precision is high. By using the whole sorting system, the continuous operation of a discharging system of produced tailings can be ensured, and it is ensured that all the hard rocks and iron return to a production system (1-6) after sorting, and the environment-friendly zero-emission standard is satisfied. The iron fine removal and sorting system for magnetic hard rocks has a high automation degree, a compact structure and a small occupied area and is convenient to install.
A: A system for manufacturing and separating dust-free manufactured natural sand and a winnowing separating method. The system comprises a PLC controller. Stones are conveyed to a feed port of a sand making machine (A) by using a stone conveying mechanism (A1), an exhaust port of the sand making machine (A) directly faces a start end surface of a manufactured-sand conveying mechanism (A2), a tail of the manufactured-sand conveying mechanism directly faces a feed end of a modular multi-layer vibrating screen (D), a discharge end of the modular multi-layer vibrating screen (D) directly faces a feed end of a manufactured-natural sand grading adjustment system (B), a discharge end of the manufactured-natural sand grading adjustment system (B) directly faces a feed end of a manufactured-sand winnowing system (C), and discharge ports of the manufactured-sand winnowing system (C) corresponding to manufactured-sand with different particle sizes are connected to respective storage tanks. The present invention can implement winnowing of manufactured-sand, and can also implement dust-free sand manufacturing.
B: An air dry sand coal sorting system, comprising a machine body (2), a sorting system (3), a coal discharge system (4), a gangue discharge system (5), a medium processing system (6), an electric control system (7), a dust removal system (8) and an auxiliary system (9). The sorting system (3), the coal discharge system (4), the gangue discharge system (5), and the medium processing system (6) are all located in the machine body (2). The coal discharge system (4) and the gangue discharge system (5) use and cooperate with a coal block layer and a gangue layer on the sorting system (3) respectively. A discharge port on the coal discharge system (4) and a discharge port on the gangue discharge system (5) are separately in communication with a feeding port on the medium processing system (6). A discharge port on the medium processing system (6) communicates with a feeding port on the sorting system (3). The electric control system (7) is separately electrically connected to the sorting system (3), the coal discharge system (4), the gangue discharge system (5), the medium processing system (6), the dust removal system (8) and the auxiliary system (9). A dust removal port of the dust removal system (8) communicates with the machine body (2). A discharge port on the auxiliary system (9) is connected to the feeding port on the sorting system (3). Compared to the prior art, the described system has the advantage of being able to completely replace a water method for coal sorting and composite air separation, which effectively reduces the cost of coal sorting and significantly improves the efficiency of coal sorting.
C: Provided in the present invention is a system for treating steel tailings using a dry method, comprising: a roller mill completing repeated dissociation and pre-separation of the steel tailings and separating out minerals rich in iron particles and other light materials; a gravity separator connected to the roller mill to separate out heavy particles rich in iron particles; a first magnetic separator connected to the gravity separator to separate out the iron particles from the heavy particles rich in iron particles; a three-stage mass separator provided at the upper portion of the roller mill to separate out heavy particles, light particles, and steel slag micro-powder from the other light materials according to the weight; a second magnetic separator connected to the three-stage mass separator to separate out fine iron powder rich in magnetic iron oxide from the heavy particles; and a third magnetic separator connected to the three-stage mass separator to separate out iron-rich RO phase minerals from the light particles. According to the system for treating the steel tailings in the present invention, repeated grinding dissociation and pre-separation can be performed on the steel tailings, so that 100% of the steel tailings are converted into the iron particles, the fine iron powder, the iron-rich RO phase minerals, and the steel slag micro-powder.
D: A material separation method and a material separation system (10). The material separation system (10) is in communication connection with a first delivery mechanism (100), a detection device and a separation mechanism (300) by means of a central control device. A preset detection position is arranged at the first delivery mechanism (100). The detection device detects whether or not a material passing the preset detection position carries a metallic substance. If the material is detected to carry a metallic substance, the central control device records the material as an item to undergo separation. When the item is detected to have been delivered to a preset separation position, the central control device controls the separation mechanism (300) to perform a separation operation on the item. During the entire separation process, the material separation system can continuously perform separation operations without being stopped, thereby increasing separation efficiency and accuracy.
Answer: C