Unit produces 500 kg purified product per melt.
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1. Sulzer MWB process
The Sulzer MWB process consists of repetitive partial solidification of the crystallizable melt, with a crystal layer is formed on the surface heat exchangers rather than in the bulk of the liquid. In this way, the crystallization heat across the crystal layer, with one side in direct contact with the cooling surface. The non-adiabatic mode of the crystal layer growth leads to rapid deposition of the crystalline mass, and this ensures a high production capacity and compact equipment. The degree of impure substructure that develops in the crystalline layer, which grows under these conditions, however, reduces the product purity and to some extent the product yield. To counteract these effects, it works Sulzer MWB process with internships, leading some partial coagulation and partial re-melting operations is. Both re-melting and solidification are carried out at temperature gradient and temperature profiles which are optimally adapted to a specific separation problem by Sulzer MWB extensive testing and know-how. For example, the temperature regime used during an internship promotes clotting preferential deposition of the desired element or the desired fraction. The re-melting operations consists of a temperature melting of the preferential treatment that the substructure in the impure crystal layer promotes.
1.1 Working in internships and re-crystallzation
The SULZER MWB process is based on training and re-crystallization to the power to split into residue and product, the latter corresponding to the required specifications in terms of yield and purity. The work placement takes place in countercurrent, which crystallized fraction and residual melts with increasing purity are brought into contact. Each traineeship shows the total solution or previously crystallized fraction of a known quantity the residual melts obtained in the successive interesting traineeships. After completion of melting, the re-crystallization and eventually started a new, purer, crystallized fraction and the corresponding residual melt to produce. Prior to the next stage to proceed, undergoes partial re-melting the crystallized fraction at a specific predetermined and precisely controlled temperature gradient. This operation is called sweating and ensures further purification effect by the impure substructure preferentially to melting of the crystallized fraction.
In the first stage, the residual melt, R 2, the partially melted fraction, S1, and recycling residue, R, merged and then crystallized to crystals, C1, R1 and residual melt to obtain. During the second crystallization stage is fresh food together with melted crystal, C1, residual melts, R3 and partially molten fraction, S2. The second stage delivers crystal C2, and residual melts R2. The third stage is partly molten material, combined with molten crystal S3, C2. After the crystallization step followed by partial melting, are product, C, and residual melts, R3, obtained.
The SULZER MWB equipment is based on a system of vertical pipes with equal flow falling films of melt and the heat medium in length drawn on opposite sides of a tube. The crystallized melt solidification the mag tubes such that the crystal layer is formed on the heat exchange surface and not in the bulk of the liquid. In this way, the crystallization heat spread through the crystal layer, resulting in rapid deposition of crystal mass due to the non-adiabatic nature of crystal growth. This results in a high production capacity and compact equipment. The biggest advantage of working with a crystal layer instead of bulk crystals is the elimination of the otherwise unavoidable acts such as slurry handling, transport of solids and phase separation by filtration. After deposition of the described crystal mass, the melt flows down into simply a collection vessel. The subsequent partial melt washes both the crystal layer and washed pieces of equipment that are contaminated by the residual melt.
The installation consists of the crystallization column, S-1, and a number of storage tanks for residual melts of variable composition. The "setup assistant" are circulating pumps, PP and CP, and the heat medium-conditioning unit, CH. The equipment in MWB SULZER is compatible with a 3-stage process SULZER MWB Process.
Working in stages according to Definition SULZER equipment is periodically and sequentially. This means that only one stage at a time and performed a predetermined succession of stages, as required by the Sulzer MWB process. While working in internships, is crystallized mass held at the crystallizer, S-1, whereas residual melt stored in storage tanks and used for 'contingencies acting "(with interlinking of crystallized mass and residual melt) in accordance with the proposed sequence. The training sequence is performed by allowing melting of a storage tank T (S1, R2 and R1) in the collection tank CT. The product pump circulates the PP by the melt crystallizer where a crystalline mass is deposited under the influence of carefully specified, and maintained temperature gradient. The latter are controlled by the heat medium-conditioning unit, CH, and the heat medium circulation pump CP. After the predetermined amount of deposited mass of crystals, flows the melt in the collection tank, CP, and a portion separated as residue. The remaining melt is transported through the pump PP into the storage tank T-1.
Now, partial re-melting of the crystallizer content suitable place at elevated temperatures of the heat medium. In this way, crystalline mass obtained C1 and S1 residual melts, which runs into the collection tank, wash the crystal mass and the washes while the equipment before it is transported to tank T-1. The second stage is a total re-melting of crystals in C1 with prescribed quantities of fresh food and the contents of tank T-2. The latter contains residual melt S2 and R3. After the second stage, with partial coagulation and then partial re-melting, melting, crystals and residual C2 R2 and S2 obtained. The residual melt is stored in tank T-1 and the crystals are exposed to the latest stage in the process. This means a total re-melting in, in S3 residue coming from tank 3. Pure product C is finally obtained after the sequential and partial re-melting Partial coagulation. After the predetermined amount of the residual melt purest S3 was drained, the crystals and the equipment thoroughly rinsed with almost pure product, such that total re-melting of the product without any possible contamination with impure melt.
The work placements SULZER Process Definition is automatically activated and controlled by a computer, where the feedback principle is used to reproducibly and reliably operate.
The MWB SULZER System is basically problem free operation. This was made possible by both Design and Process Equipment Design. The sequential nature of work placements ensures that crystal deposits completely solved once per stage. This does prevent from crusting, which limits both capacity and separation efficiency. Simple mechanical construction of the equipment is reliable and SULZER MWB almost maintenance-free operation. Except pumps and valves throughout the system contains no moving parts.
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