Introduction of lead-zinc ore beneficiation flotation equipment

Now lead zinc ore dressing plant production for stone processing and outsourcing ore. The lead-zinc ore dressing crushing process is a three-stage closed circuit, the coarse crushing is 0.4mX0.6m jaw crusher , the medium crushing is d1. 2m standard cone crusher, and the fine crushing is d1200mm short head cone crusher .

The grinding and floating process is more complicated. The original ore is given a +2.7m×3.6m lattice ball mill . The spiral classifier overflows with a hydrocyclone to control the grading. The cyclone grit feeds into the 2.4mx1.2m conical ball mill and spiral grading. The machine constitutes a closed-circuit grinding, and the staged overflow and the cyclone overflow are mixed into the lead flotation circuit. Lead flotation first carries out coarse = fine three sweeps; produces lead concentrate I, sweeps I concentrate and selects lead tailings; then re-selects the sweeping I concentrate, and then selects one coarse and three fines; Production of lead concentrate II and lead tailings II. The two lead-selected tailings are combined to carry out a coarse-sweeping zinc-sulfur mixed-mix; the final tailings zinc-sulfur mixed concentrate is discarded to produce zinc concentrate and sulfur concentrate. The characteristics of lead flotation are re-grinding in the middle mine, sub-stage slurrying, step-by-step series, and speed-floating flotation process.

The flotation machine is one of the main equipments in the lead-zinc ore dressing equipment. There are many types of classification. The mechanical agitation flotation machine and the inflatable flotation machine are widely used. The flotation equipment in China is the same as other ore dressing equipment. In the past, zinc beneficiation plants used a large number of F-type flotation machines. This model also adapts to the needs of large-scale, automated development. As a result, a number of new flotation equipment have been adopted for the construction of new concentrators and old plants. Zhengzhou Huachang Machinery Manufacturing Co., Ltd. produces lead-zinc ore beneficiation equipment. The flotation machine has an inflatable flotation machine and a stirring flotation machine. The appropriate models are configured according to different processes.

In China, the largest single volume production applications on Dexing Copper Mine in successful pilot 38d KYF-38-type flotation machine. The large-scale flotation equipment is conducive to saving investment and reducing production costs, facilitating maintenance and automatic control. However, it should be noted that the phenomenon of “short circuit” of the slurry should be avoided if the number of slots is too small. Generally, the sweeping operation should not be less than 8 slots. The rough selection machine uses a large flotation machine and is selected as a smaller flotation machine. The economic benefits inherent in large flotation machines can be utilized.

There are several types of aerated agitation flotation machines developed and produced in China :

1. CHF-X flotation machine

It is characterized by large circulation of pulp, large circulation area, high aeration volume, low impeller line speed and low power consumption. Existing volume of 3. 5m ^3, 7.0m ³ and 14m ³ three sizes. Promote the use of CHF-X14 flotation machine in more than 10 large and medium-sized concentrators. Both have achieved higher technical and economic indicators than the A-type flotation machine. These indicators are mainly reflected in the increase in recovery rate, the reduction in stand-alone power, the increase in the life of the impeller cover, and the savings in the amount of foaming agent.

2. C KYF type and XCF type flotation machine

The flotation machines of these two models were developed by the Beijing Institute of Mining and Metallurgy. Among them, XCF type inflatable flotation machine has suction energy

Force, when combined with the KYF type unit, can be horizontally configured without the need for a foam pump. Compared with other types of flotation machines at home and abroad, KYF inflatable flotation machine has reasonable design and new planing, good flow, good air dispersion, high efficiency, remarkable energy saving, simple and reasonable structure, and wear. Small, easy to operate and maintain. The 16m3 model was first successfully applied in the Luding copper mine, replacing the original 6A flotation machine. Now it has 1m ³ , 2m ³ , 3m ³ , 4m ³ , 8m ³ , 16m ³ , 24m ³ , 38m ³ specifications for large, medium and small mines.

There are several types of mechanical agitation flotation machines developed and produced in China :

Mechanically agitated flotation machines do not require blasting equipment because of their self-suction capability. Some models not only self-priming

Gas, but also self-priming, thus facilitating the horizontal configuration of flotation operations, the newly developed model is also easy to replace the A-type floating machine with self-suction capability when the old factory is rebuilt.

1. AJJF flotation machine

The utility model is characterized in that the impeller has small diameter, high height, shallow immersion depth, self-priming sufficient air volume, and a false bottom and a conduit device are installed in the tank to make the lower circulation ring of the slurry matter, and the suction amount is stabilized, and the dispersion cover is arranged on the stator. A transition zone is formed between the strong mixing zone at the bottom and the upper stable separation zone. Therefore, the liquid surface is stable without turning over. Its efficiency is high, the power consumption is low, the wear is light, and the servant is repaired. Nearly 3,000 units have been promoted in the near mine.

2. JJF flotation machine has no self-suction ability. For ease of configuration, it is best to use the first slot in each flotation operation.

SF type flotation machine with suction capacity or JJF-I type flotation machine, so that the combined unit of the day is beneficial to play the superior performance of various flotation machines, in the forest, Taolin, Shuikoushan, Fan mouth, tin iron mountain, Xiaotieshan such as lead and zinc processing plant are used SF / JJF joint unit, with satisfactory technical and economic indicators.

3. SF type flotation machine

The SF flotation machine adopts a backward tilting double vane impeller with a diversion tube and a false bottom. It has reasonable structure, good performance, self-priming air and pulp capacity, horizontal configuration, no foam pump, and also The power is small, the impeller speed is low, the impeller and the cover plate are lightly worn, the air intake is large, and the mineral liquid surface is stable. The use of this machine is conducive to the process layout, especially suitable for complex processes and selection of a large number of selected plants. At present, the machine has several specifications such as 0.15m ³ , 0.37m ³ , 1.2m ³ , 4m ³ , 8m ³ , 10m ^{3 ,} etc . , and has achieved the effects of improving recovery rate and saving electric energy.

4. XJZ flotation machine

The slurry performance of the machine is good, the selection index is higher than A, the flotation machine has self-suction capability, and the first slot of each section has white suction capacity. The machine has two specifications of l.lm3 and 2.8m3, which is especially suitable for the transformation of A-type flotation machine in medium and small-scale selection plants. It can utilize the original foundation and most parts except the spindle, impeller and cover plate. Save on renovation costs. The plant uses a branch-stream flotation process to increase the beneficiation production index and enhance the recovery of silver and pyrite without increasing equipment and plant. Long-term production practice shows that the process adapts to the ore properties of Yinshan, not only can improve the beneficiation index, but also the operation is stable, the quality of the concentrate is also easy to control; the treatment volume is increased by 15%; the process is applied without increasing the flotation equipment and under conditions of less capital, comprehensive recovery of lead-zinc ore pyrite; branch stream flotation process as compared with the period of the original process, lead recovery increased 1.0% -1.5%, 2% zinc recovery rate After the branch flow flotation process, the silver content in the lead concentrate increased from 138.3 g/t to 299.3 g/t, and the recovery rate of silver was significantly improved.

Slab gate valves are usually used for the oil & gas pipe-lines. 

Slab Gate Valve are manufactured with a full bore, slab gate, rising stem OS&Y and floating seats. Slab gate is a simple solid gate design, featuring metal-to-metal seal between gate and seats, to apply for the most severe service condition, including corrosive and abrasive fluid environments. A floating seat is designed to match the slab gate. A belleville spring and O-ring between each seat and body ensure a tight seal against the slab gate. The floating slab gate uses the natural force of line pressure to obtain a dynamically tight downstream seal in high-pressure differential applications. Low-pressure sealing is accomplished with an o-ring that energizes the seat and minimizes corrosion and debris build up. Common trims are available. 

Double block and bleed capability and automatic relief of excess body pressure are standard feature of this seat design.

The smooth, continuous bore minimizes turbulence within the valve and when in the open position it produces a pressure drop equivalent to a portion of pipe of same length and diameter. The seat faces are outside the flow stream and therefore protected from the erosive action of the flow. Pigs and scrapers can be run through the valve without damage.
Through Conduit Slab Gate Valve design minimizes and eases the maintenance allowing for the service operations to be done without the removal of the valve from the line.

Slab Gate Valve

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