1) Crushing and screening: The initial stage of the plant is a coarse crush, and the product size is 500~0mm. The coarsely crushed product is supplied to a dry self-grinding mill (now deactivated). In the first phase of the project transformation and the second phase of the construction of the new crushing and screening system, in order to adapt to the requirements of the ¢2200 medium crusher ore size less than 350mm, the original 1500/300 rotary crusher is changed to 1350/180 non-standard Type gyratory crusher. The original ¢2200 single-cylinder hydraulic medium crusher was a trial-produced product. Due to serious oil leakage in the hydraulic system and frequent accidents such as small bevel gears, it was replaced by stereotyped products in 1975~1977. machine. The original 1.5×4m double-layer resonant screens were installed. Because the leaf springs often break, the spring bolts often fail, the screen is easy to block, etc., it is replaced by the SZZ21.5×4m hanging self-centering vibrating screen. The hanging type is changed to a seat type. In 1984, the dust removal facilities of the crushing system were reformed and achieved good results. From June to August 1986, the qualified rate of air dust in the plant reached 85%. The crushing system now has an annual production capacity of 8 million tons of raw ore. The product on the crushing sieve can meet the requirements of shaft furnace roasting, that is, the content of more than 75mm and less than 20mm are within 10%. The crushing and sieving and roasting process flow is shown in the following figure:
2) One-choice process: The first selection was completed and put into production in July 1970. The initial selection process is a weak magnetic-strong magnetic open process. After two years of production practice, the process can not select the final qualified concentrate, recycling The rate was also very low, and at that time the magnetic force was not enough, the medium was clogged, and the production could not be carried out normally. For this reason, the production was stopped in August 1972 and the technical transformation was carried out according to the floating-magnetic process. The first renovation project was completed and put into production in 1974. The design indicators are: original ore grade 26.7%, concentrate grade 59%, ore dressing ratio 2.75, recovery rate 80.08%. The long-term production of the float-magnetic process indicates that the design index cannot be reached. The main reason is that the number of tremolite -type ore in the mining ore is increased due to the change of the depth of the stope. The ore of the ore is easy to float and easy to float. The stone enters the concentrate and reduces the concentrate grade (53~55%), and the recovery rate is also greatly affected. The average indicators from 1981 to 1985 were: 28.18% of the original ore grade, 58.18% of the concentrate grade, and 66.79% of the recovery. In order to improve the sorting indicators, improve economic efficiency, in stages from early 1985 to start a second transformation, using heavy - Magnetic - floating stage grinding and separation process, the grinding system consists of a ball 10, four secondary ball mill Two sets of production systems are formed. The flotation is carried out in an acidic medium using sodium petroleum sulfonate as a collector . The design indicators are: original ore grade 26.82%, concentrate grade 64.21%, recovery rate 72.01%, tailings grade 10.73%, ore dressing ratio 3.32. In April 1986, due to the acid compounding system not yet completed, the alkaline medium flotation was temporarily used. The process indicators obtained are shown in the figure below. After 1987, the flotation was carried out using acidic medium. The system process has not been examined. The preliminary selection indicators obtained during the commissioning phase are: 28.2% of the original ore grade, 63.03% of the concentrate grade, 68.06% recovery rate and 12.95% of the tailings grade. There is still a gap with the design indicators, and further improvement is needed.
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