2026Mining plantExaminationsLibraryAndAnswer1. The main indicator for evaluating the effects of grinding mines during the selection process is () a single selection issue (2 points per issue, totalling 30 points). A. The grinder turns b. The fineness of the mill and the processing capacity of the mill c. Steel size d. The solution to the problem bParsingThe effect of grinding is usually measured by the fineness of grinding (-0. 074 mm content) and the time processing capacity of milling units, which together reflect the quality and efficiency of grinding. 2. In the float process, the influence of the ph value of the mine on the float indicator is mainly reflected (). A. Impacting blowing agent performance b. Only c., which affects the surface properties of minerals and the effects of agents, d., which is not related to the floating effects, is an important regulatory parameter of the floating process by influencing the interaction between minerals and agents by directly altering the presence of mineral surface electrons and pharmaceutical agents. 3. During the re-selection, the material is separated by () in the medium. A. The essence of the resolution of the re-selection of the " c. Color " answer for the particle b. Density difference is to use the inter-mineral density difference in order to achieve density stratification and separation in the motion medium. The magnetic field strength commonly used by the magnetograph when selecting powerful magnetic minerals is (). A. Weak magnetic field (80 ~ 160 ka/m). B. Medium magnetic field (160 ~ 400 ka/m). C. Strong magnetic field (400 ~ 1200 ka/m). D. Any magnetic field strength answer a, dissects magnetic minerals such as magnetite, can be fully magnetically recovered under the weak magnetic field, where weak magnetic field magnetographers (e. G. Barrel magnetographers) are commonly used equipment for this type of mineral. 5. The most suitable steel ball filling rate is typically () when the mill operates. A. 10 per cent - 20 per cent b. 30 per cent - 40 per cent c. 50 per cent - 60 per cent d. 70 per cent - 80 per cent answer b resolve grinder steel fillings are too high or too low, reducing the efficiency of grinding mines, generally within 30 to 40 per cent of production. Among the floated agents, those used to enhance mineral surface dilation are referred to (). A. The answer to the b. Impregnant, c. Inhibitor, d. Activator, c. Decomposition trapper can selectively adsorb to the intended mineral surface, increasing its hydrophobicity and making it more adsorptable to bubbles. 7. When the hydraulic rotor works, clogged sediment mouths may result (). A. The reduction of c. U. Sediment concentrations by c. To increase the pressure of the mine above d. Is likely to result in a reduction in the efficiency of parts of the rotor, an increase in the crude particles (run rough) in the spill and an abnormal increase in the pressure of the mine and a decrease in sediment concentrations. 8. The following equipment is not part of the fragmentation equipment: the c. Responsive b. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. B. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C 9. At the float, the rate at which bubbles float in the ore plasma is associated with () a. Neither the bubble diameter nor the mineral viscosity b. C. Ore slurry temperature d. Or more is relevant to answer a, which is influenced primarily by the size of the bubble and the viscosity of the mineral, the larger the bubble and the smaller it is, the faster it floats. 10. The main role of tailings banks at mining plants is (). A. Storage of concentrate b. For tailings and clarification of c. Wastestone d. In re-water and wastewater answer b to resolve tailings deposits for tailings resulting from the re-mining, together with the function of clarifying backwater for the production of recycled water. 11. The most commonly used graded equipment in milling operations is (). A. Vibration b. Hydraulic voltage c. Rockbed d. Magnetometer answer b is the most commonly used graded device in the grinding ore circuit because of its simple structure and its high grade efficiency. 12. Which of the following agents is a blowing agent? () a. Yellow b. Pineol oil (no. 2) c. Copper sulphurate d. Lime answer b decomposition of pineol oil (no. 2) is a typical blowing agent; yellow medicine is a picker, copper sulfate is a active agent and lime is an adjustment agent (ph adjustment agent). The main reason for the entry of non-magnetic minerals into concentrates during the magnetic selection process is () a. The correct answer for the magnetic reunion of b. Magnetic minerals at c. Ore magma concentration above d. Is that the combination of mechanical decomposition, magnetic mineral magnetic combinations form non-magnetic particles in the "magnetic chain" band, and the excessive concentration of the magma is confusing, leading to the entry of non-magnetic minerals into the concentrate. The equipment commonly used for tailings enrichment is (). A. Enrichment b. Filter c. Dryer d. Centrifugal answer a is the core equipment for tailings dehydration enrichment, using gravity deposition to increase mineral concentration. 15. The processing capacity of mining plants is usually expressed in () a. The commonly used hourly processing volume (t/h) or daily processing volume (t/d) of the processing capacity of the processing plant in the form of c. T/month/d. T/h or t/day answer (t/d) indicates that it is easier to produce movement control and equipment selection. Ii. Multiple selections (2 points per question, 10 points) 1. The following are the basic mining operations: the bcd dehydration (concentration, filtration, drying) solution for b. Grinding class c. Selection (re-selection, float, magnetic selection, etc.) typically includes the four basic operational stages of fragmentation screening, grinding grade, selection and dehydration. 2. Factors affecting the efficiency of the mill mill grinding mine are () the a. Steel ball filling rate and the conversion rate of the grinding machine at c. D., which makes up the answer to the particle size of the mine, are four types of factors that significantly affect the milling efficiency and require integrated regulation. 3. Adjustments commonly used in the float process include () the a. Lime b. Sodium carbonate c. Sulphurate d. Waterglass answer abcd resolves lime, sodium carbonate, sodium sulphate is used to adjust the ph of oreium, and water glass is often used as dispersants and pulsers, and is covered by the adjustment. 4. The following is correct with respect to hydro-voltagers: (). A. The higher the pressure on the mine, the smaller the grade particle size b., the higher the concentration of the sediment c. Spill, the greater the depth effect rating d. Cone, the thicker the class size, the bcd resolution of the pressure on the mine, the size of the sediment mouth, the depth of the spill and the cone angle directly affect the grade particle size and efficiency of the rotor. 5. Dehydration methods commonly used in mining plants include (). A. Enrichment b. Filtering c. Dry d. Magnetic answer abc dewatering includes enrichment, filtering, drying, and magnetic selection is a separate job. Iii. The judgmental questions (1 point, 10 points each) 1. The purpose of fragmentation and grinding is to fully disentangle the useful minerals from the pulsar minerals. The answer is correct 2. The critical turn speed of the grinder is that the grinder moves at a rate that enables the outermost steel ball to move with the cylinder. The correct answer is 3. The higher the concentration of the mine, the better the effect of the float. The answer is an error in the resolution of the high concentration of the mineral plasma, which increases its viscosity, makes its pneumatic conditions worse, and reduces the floating indicator. There is an appropriate range of floating concentrations for all types of ores. The higher the magnetic field strength of the magnetograph, the better the separation of any mineral. The answer is wrong to interpret the strong magnetic minerals for recovery under the weak magnetic field, which blindly increases the strength of the magnetic field, which results in a combination of non-magnetic mineral machinery and lower levels of fine minerals. 5. A tailings bank is an essential safe and environmentally friendly facility for mining plants. The answer is correct 6. The re-selection method applies only to the treatment of crude particles and has no effect on fine particles. The error resolution re-selection of the solution has had a significant effect on rough particles, but with the development of equipment such as centrifugal re-selection, shaking beds and so forth, there has also been a selective effect on fine particles, albeit less efficient. 7. Ph of ore is one of the important regulatory parameters in the float process. The answer is correct 8. The particle size of the spill is usually thicker than that of the sediment when the hydraulic rotor works. The answer was wrongly decomposition of the flower to a fine particle class product, sediment to a crude particle class product, and spill to a finer size than sediment. 9. The mineral selection ratio is the ratio of the weight of the original ore to the weight of the concentrate. The correct answer is 10. The answer is four and a brief answer is five points each, 20 points each. The solution floats into the air, using differences in the physical and chemical properties of mineral surfaces, and following treatment of floating agents (receivers, blowing agents, adjusters, etc.) in the ore plasma. The highly hydrophobic target minerals are attached to bubbles that float to mineralized foam formation on the surface of the ore, and the highly hydrogenic pulsary minerals remain in the ore, thus separating the minerals. 2. Briefly describe the rationale of the magnetic selection. The answer to the magnetic selection is to take advantage of the differences in mineral magnetism, where the magnetic effect of a strong magnetic mineral is attracted to the magnetic polar surface, and non-magnetic minerals are separated from non-magnetic minerals by the same force as gravity, centrifugal force, so that they are separated from non-magnetic minerals. 3. Brief description of the main factors affecting the level of efficiency. Answer (1) to mineral properties: includes the composition, concentration, mud content, etc. Of the mine size; (2) equipment structural parameters: e. G., flower diameter, cone angle, depth of penetration of the spill pipe, size of sediment mouth, etc.; (3) operational parameters: pressure on the mine, concentration of the mine, etc.; (4) equipment maintenance condition: sand mouth wear, congestion, etc. 4. Briefly describe the basic requirements for safe production at the mining plant. Answers (1) establish sound and safe production responsibility and operating protocols; (2) periodic overhaul and maintenance of equipment to ensure the integrity of protective facilities; (3) operators must be trained and certified to wear labour protection supplies properly; (4) strengthening dust and noise management to prevent occupational hazards; (5) development of contingency plans and regular exercises to ensure the safety of priority areas such as tailings banks。5. Computation question (5 points each, 15 points) 1. A mining plant treats 2,000 tons of the original ore on a day-to-day basis, with a refining rate of 25 per cent and a daily volume of refined ores and tailings, respectively. The answer mineral volume = 2000 x 25 per cent = 500 tons of tailings = 2000-500 = 1,500 tons of decomposition rate refers to concentrate as a percentage of the original mine, which is reduced by the original ore. 2. 50 tonnes/ hours, 20 hours per day (4 hours of overhaul) for grinder-days. = 50 x 20 = 1,000 tonnes/day = time processed on a stage x actual operational time per day. 3. The original mineral grade is known to be 1. 2 per cent, the refined mineral grade is 20 per cent, the tailings grade is 0. 15 per cent and the refining and recovery rates. Answer rate: gamma recovery rate: parsing: two-product formulae first, followed by yield, original ore grade and refined mineral grade. 6. Topics of discussion (15 points each, totalling 15 minutes) 1. In practical terms, ways of reducing tailings grade and increasing metal recovery rates at mining plants are discussed. The answer is lower tailings and higher metal recovery rates, which are central to the efficiency gains of the mining plant, by: (i) optimizing milling is a key factor influencing the selection of indicators. Rationally fine-tuning the grinding of minerals to fully detached the useful minerals from the pulsal minerals and to avoid over- and under- grinding. At the same time, it optimizes steel ball ratios and grinding concentrations, improves the efficiency of grinding and creates good conditions for subsequent selection. (ii) to improve the selection process by adapting it in a timely manner to changes in the nature of the ore. The benefits of the individual selection methods can be fully realized through the use of a process of stage grinding, stage selection, which reduces the loss of the relevant minerals in the process of milling; combined processes (heavy-floating, magnetic-floating, etc.) may be used for difficult minerals. (iii) optimization of the pharmaceutical regime for the rational selection of collectors, blowing agents, types of inhibitors and quantities to be used, and determination of the best pharmaceutical regime through testing. Enhance automatic control of pharmaceutical additions, achieve precision additions and increase the rate of selectivity and recovery. (iv) strengthen process parameters such as operational management and automatic control to stabilize mineral volumes, mineral concentrations, ore ph values, and promote the use of automated detection and control systems to reduce man-made operational fluctuations and ensure the stability of production indicators. (v) enhanced tailings mine re-election to tailings mine
