Pipe solid waste poses considerable harm to the environment, but if it can be properly and reasonably used, it can turn harm into benefit and turn waste into treasure. Solid wastes are relative from the perspective of wastes. Wastes from one process can often become raw materials of another process. Therefore, solid waste is also called "misplaced raw materials". In this sense, solid waste is actually a kind of resource, which has a wide range of uses.
(1) Used for production of building materials. The composition of many industrial waste residues is similar to natural building materials or artificial building materials in nature, such as waste residues containing calcium, silicon, aluminum and other oxides and (or potentially) hydraulic cementitious, which can be used as wall materials such as cement, bricks and tiles; Waste slag and waste rock with certain strength and stable volume can be used as concrete aggregate. At present, the fly ash from thermal power plants is used to build roads, and the cinder from coal combustion is used to make ingot protection slag, rock wool products, cement raw materials, etc., which not only achieves good environmental benefits, but also obtains considerable economic benefits.
(2) Recycle resources and energy. Many waste rocks, tailings, waste residues, etc. contain a certain amount of metal elements or auxiliary components required for refining metal elements. If it is used in metallurgical and chemical production, good economic and environmental benefits can be obtained. For example, in the mid-1970s of the United States, the proportion of metals recycled from waste in the output of various metals each year was 18% aluminum, 50% copper, 50% lead, and 31% steel. Recycling waste paper from garbage can save a lot of paper making wood, and can also reduce a series of pollution in the paper making process from wood. The disposal of 1 million tons of waste paper is equivalent to replacing 600 square kilometers of forest for paper making; 120~130 tons of waste cans can recover 1 ton of tin, equivalent to mining and smelting 400 tons of tin ore; It is also desirable to recycle energy from some wastes. For example, many coal gangue contain a certain amount of carbon, with a calorific value of 200~2000 kcal/kg, and the carbon content of fly ash is usually above 10%. Using these waste residues to burn bricks, tiles, cement, etc. not only uses raw materials, but also uses the energy in the waste residues, saving energy. In recent years, China has used coal gangue to develop pithead power stations, saving a lot of coal and transportation, and the fly ash discharged from it is used for pit backfilling. In addition, a large number of organic substances in urban garbage can be biodegradable to produce biogas, and some organic substances, such as waste plastics, can be processed to produce fuel oil.
(3) It is used to improve soil and increase fertility. Compost the urban garbage with more organic components to make it harmless and turn it into organic fertilizer. Many waste residues contain nutrients necessary for plant growth, and also have the function of improving soil structure. For example, the silicon calcium potassium fertilizer made from waste residue can not only solve the problem of soil hardening, but also make plants resistant to drought and lodging, enhance the ability of disease and pest resistance, and at the same time promote the early maturity and yield increase of grain.
Solid waste also has many uses, such as selecting rare metals, plastic fillers, vitamins, chemicals, activated carbon, etc. from waste residue. It can be seen that the placement of solid waste is harmful and the utilization is valuable. The comprehensive utilization value is considerable.
Hongqiao Technology Co., Ltd. is a high-tech enterprise specializing in the research, development and production of cutting fluid, electronic hardware cleaner, surface treatment agent, welding materials: solder paste, tin rod, tin wire, BGA solder ball, SMT tin, electronic flux and thinner, electronic welding equipment and accessories, electroplating anode plate (rod), semi tin ball and other products.