Ningxia Petrochemical Company strives to improve the reuse efficiency of wastewater, and actively performs the technical transformation of the wastewater reuse device. After the technical renovation of the sewage reuse device entered normal stable operation on February 25 this year, as of April 27, it will recycle 100,000 tons of wastewater.
The Ningxia petrochemical wastewater reuse plant was completed and put into use in July 2008, but the original design was mainly aimed at recycling industrial wastewater. In order to continuously improve the efficiency of the comprehensive utilization of water resources, Ningxia Petrochemical has been strengthening the management of water conservation and at the same time, it has put the maximization of waste water recycling on an important agenda, and decided to integrate domestic waste water pipelines into wastewater reuse plants to implement simultaneous recycling of domestic wastewater. . The composition of domestic waste water and industrial waste water is not the same, and in particular, the COD content of domestic waste water is greatly increased. As a result, the walnut shell filter of the waste water reuse device is often clogged, and the device cannot operate normally. In response, Ningxia Petrochemical actively carried out thematic research, and after a lot of research and analysis, it creatively replaced the walnut shell filter material of the walnut shell filter with quartz sand filter material, which solved the crux of problems that had long plagued the device. At the same time, technological transformation of the biochemical devices of the pretreatment system of the sewage reuse device was carried out to improve the pretreatment capacity.
After the implementation of technological transformation, Ningxia Petrochemical strengthened its operation management, optimized its process flow, and steadily improved its operating efficiency. At present, the recovery efficiency of Ningxia petrochemical wastewater reuse plant reaches 140 tons per hour, and the wastewater discharged from the effluent is reused effectively. It is estimated that 800,000 tons of water can be saved in the whole year, and the effect is 1.2 million yuan.
"Gravity Die Casting. A permanent mould casting process, where the molten metal is poured from a vessle of ladle into the mould, and cavity fills with no force other than gravity, in a similar manner to the production of sand castings, although filling cn be controlled by tilting the die."
Gravity Die Casting
Sometimes referred to as Permanent Mould, GDC is a repeatable casting process used for non-ferrous alloy parts, typically aluminium, Zinc and Copper Base alloys.
The process differs from HPDC in that Gravity- rather than high pressure- is used to fill the mould with the liquid alloy.
GDC is suited to medium to high volumes products and typically parts are of a heavier sections than HPDC, but thinner sections than sand casting.
There are three key stages in the process.
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The heated mould [Die or Tool] is coated with a die release agent. The release agent spray also has a secondary function in that it aids cooling of the mould face after the previous part has been removed from the die.
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Molten metal is poured into channels in the tool to allow the material to fill all the extremities of the mould cavity. The metal is either hand poured using steel ladles or dosed using mechanical methods. Typically, there is a mould [down sprue" that allows the alloy to enter the mould cavity from the lower part of the die, reducing the formation of turbulence and subsequent porosity and inclusions in the finished part.
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Once the part has cooled sufficiently, the die is opened, either manually or utilising mechanical methods.
Advantages
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Good dimensional accuracy
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Smoother cast surface finish than sand casting
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Improved mechanical properties compared to sand casting
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Thinner walls can be cast compared to sand casting
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Reverse draft internal pockets and forms can be cast in using preformed sand core inserts
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Steel pins and inserts can be cast in to the part
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Faster production times compared to other processes.
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Once the tolling is proven, the product quality is very repeatable.
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Outsourced Tooling setup costs can be lower than sand casting.
Gravity Casting Parts
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