First, brick making
Ordinary wall bricks are the most used building materials in the construction industry. The state has developed a series of measures to protect cultivated land in order to protect agricultural production. Therefore, the clay resources of brick making are becoming more and more tense, and the use of pyrite cinders to make bricks is A good way. Since burning low sulfur iron ore slag silicon dioxide, aluminum oxide, active content shall be added a small amount of coal slag, ash, and lime as a binder, mixing the ingredients pyrite cinder, grinding wheel, plus Finished bricks are produced by processes such as press forming and steam curing. Pyrite cinder can not only produce ordinary wall bricks, but also can prepare colored wall tiles, colored glazes and the like.
Shanghai Sulfuric Acid Plant measured the performance of pyrite slag bricks with reference to the standard of lime sand brick "JC153-74" and the standard of coal slag brick "Shanghai QIFO-004-79". The sand-lime brick, cinder blocks are compared, the results show that, in addition to the bulk density (specific gravity) biased towards, the performance exceeds pyrite cinder block slag brick, similar to clay tile, brick and slag pyrite good performance can be in the field Application in architecture. The use of pyrite slag to make bricks can greatly reduce the destruction of farmland caused by brick making, and can reduce the storage place of pyrite slag and improve the pollution of the environment.
Second, cement adjunct
The use of pyrite slag as a cement-assisted slag can not only correct the composition of Portland cement raw material mixture, increase its iron oxide content, reduce the modulus of alumina soil, but also increase the strength of cement and enhance resistance. Mineral water is etched and reduces its thermal folding. In addition, the calcination temperature can be lowered, which is advantageous for reducing heat consumption and prolonging the service life of the refractory brick of the roaster. Cement production does not have strict requirements on the quality of pyrite cinder, and 30% of iron can be used. The use of pyrite cinder instead of iron ore fines as a flux for cement firing is a direction of comprehensive utilization, and is particularly suitable for the treatment of pyrite slag with low iron content or containing more impurities such as sulfur and arsenic .
Some companies in Germany, Italy, Denmark, and Spain used pyrite slag, fuel coal powder, anthracite powder, limestone , and lime to join the ball mill . After fine grinding, they were pelletized and sent to a rotary kiln (temperature 1600 ° C). In the kiln, the iron minerals are reduced, carburized, and melted into molten iron, and the cast iron in front of the furnace is periodically discharged; in the kiln, a part of the slightly soft and sticky cement clinker is burned, and then discharged and then magnetically separated to separate 10% of the granular iron, the other is made into cement after ball milling.
The pillow plate heat exchangers are very versatile, and have been used in a wide range of industries, in applications such as cooling and heating of process liquids, condensation and evaporation of condensates, freezing and defrosting of liquids, direct heating and cooling of viscous liquids, and heat recovery from effluent waste streams.
Some examples of applications of pillow plate heat exchangers include cooling and heating of food and beverages, process liquids in chemical, oil and gas processing, solids, evaporators and crystallizers for pharmaceuticals, and heat recovery from exhaust and wastewater gases in power plants.
The advantages of using pillow plate heat exchangers include high efficiency, compact design, easy and fast installation, low maintenance cost and low energy consumption. The pillow plates are also reliable and durable and can be used for years without significant wear and tear, in addition. they are corrosion resistant and require minimal cleanliness maintenance.
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