Explain the benefits of incorporating a disc stack

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Reference no: EM132242598

Question 1. Separation of solid particles from liquids can be carried out using:

• vacuum techniques
• pressure techniques
• centrifugal techniques.

Name and outline the principles behind the design and operation of one piece of equipment using each of these techniques.

Question 2. (a) Compare the relative advantages and disadvantages of the following pieces of equipment:
(i) rotary vacuum filters
(ii) plate and frame filter presses
(iii) filtration centrifuges.

(b) In each case state one typical industrial application.

(c) Select a siitable piece of equipment for the following duties (give reasons for your choices):
(i) Separation of crystals (1 mm in size) from a crystal magma, on a continuous basis where it is important for the crystals not to be damaged.
(ii) Separation of a 30% slurry of a coarse inorganic compound on a continuous basis where the moisture content of the cake must be 40% or less.
(iii) Separation of a slurry, from a batch process, which contains 0.05 kg of fine solid particles per 1 kg of water.

(d) A batch industrial reactor is operated such that 50 m³ of the slurry is produced every 4 hours. This may either be passed to a storage tank of 60 m³ capacity, or fed directly to a filter, or both. The centrifugal pump used can also feed the filter from the storage tank, and is capable of pumping 50 m³ h^-1 at a pressure of 50 kN m^-2. The maximum time allowed for emptying the reactor is 1 hr 15 mins.
(i) How would you operate this plant?

(ii) What type of filter would you use?

(iii) Give reasons for your choice of filter.

Question 3. (a) Explain, briefly, the benefits of incorporating a disc stack within a simple solid bowl centrifuge.

(b) A disc stack separator can be employed to separate two liquids of different densities. Explain the effect on the separation process of varying the location of the liquid-liquid interface.

(c) By referring to Tables 2, 3, 4 and 5 in Lesson 3, select a suitable centrifuge for each of the following liquid/solid separation duties (i) and (ii). Give reasons for your choice.

(i) (ii)

particle size 80 mm 400 mm

feed solids 65% v/v 35% v/v

solid dryness 15% w/w 75% w/w

Reference no: EM132242598

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