Plasma use in effective disposal and its production capabilities

Plasma-chemical technology is primarily used for the processing of highly liquid and gaseous wastes. Thus, it is not only about hazardous waste disposal, but about the production of valuable commercial products. The process is carried out in the plasma torch by electric arc energy at a temperature above 3,000 – 4,000°C. At this temperature, oxygen, and any waste are cleaved to electrons, ions and radicals. The degree of decomposition of toxic waste reaches 99.9995%, and in some cases it rises up to 99,99998%. High energy costs and the complexity of the problems associated with plasma-chemical technology determine its application to processing only those waste types disposal of which does not meet environmental requirements.

plasma001The prospective application of a plasma method is processing waste in a reducing atmosphere to produce valuable commodity products. In modern economies the technology of pyrolysis of liquid organochlorine waste and reducing the low-temperature plasma, allowing to obtain acetylene, ethylene, hydrogen chloride and products based on them are added to the arsenal. Such companies as Simdean, a seasoned manufacturer focusing on innovative plasma waste disposal and industrial waste disposal methods, has launched the mass production of such plasma stations. According to the the company’s report published on September, 25 in 2014, the cost-effectiveness of the method is confirmed during the 2nd or 3rd year of utilisation, despite the huge investments needed for installation or modernisation of an enterprise (eco-friendliness and meeting certain standards plays a vital role here – this is where economical preferences matter). (more…)

Raw materials in construction products manufacturing: lime in focus

Lime is a very important material that is largely used in the construction and repair industries. Lime is oftentimes added to various surface treatment solutions (e.g. whitewashing or restoration). The structure of this material consists mainly of calcium oxide. In case lime is used to whitewash or knead some solution, it would be required to slak it. Hydrated lime is obtained from the lump. Slaking means pouring the water and kneading it until it gets smooth. Lime is oftentimes classified into quick (the process takes up to eight minutes), moderate (the process takes up to 25 minutes) and slow (the process takes more than 30 minutes) types.

There are a few binders which relate to the hydraulic lime group. Lime itself represents a binder, which is used for the preparation of various solutions and widely used during the repair or construction works. Lime can be be lump or ground. For slaking ground lump is used as the hardening of this material takes place in the air after treatment with water. Slaked lime or hydrated lime is often added to the dry mixture to ensure protection from various pests. If lime is slaked in dough, it can be stored in for a very long time, and the quality of this dough gets even better.


The Prospects Of Ultrasound Use In Molten Metal Processing

The presence of metals and their alloys in even hundredths and even thousandths of a percent gases and non-metallic impurities significantly reduces their strength and ductility. To purify metal from unwanted impurities gases, oxides, nitrides, and other non-metallic inclusions a set of technological operations that can be combined under the term of refining is developed. The process of refining is an absolutely vital part of improving the quality of metals and alloys.

Purification of the liquid metal from non-metallic inclusions is to separate the melt surface tiny gas bubbles and particles of oxides, nitrides, sulfides, and other compounds which normally remain in the melt and fall into an ingot. In recent years, combined methods for refining are gaining momentum – physical and adsorptive methods are meant. Absorptive refining method implies introducing inert or reactive gases into the melt to have impurities decomposed into gaseous products. Due to the low pressure gas within these bubbles is diffused in the dissolved metal hydrogen, nitrogen, and other gases and bubbles are adsorbed on the surface of the solid particles of nonmetallic inclusions. After achieving considerable size bubbles refining agents resurfacing molten metal. For sufficiently complete removal of non-metallic inclusions from the melt must pass through metal refining a large number of substances, which is not always appropriate and feasible.

Physical refining methods, e.g. vacuuming, require additional equipment and time to process metal.