A smelting process for magnesium-containing hazardous waste/solid waste

Abstract

The invention discloses a smelting technology of magnesium-containing hazardous waste / solid waste. The smelting technology comprises the steps of S1, pretreatment: crushing magnesium-containing hazardous waste / solid waste through a crusher, and sequentially adding iron powder, lime and slags during the crushing process, so as to obtain a solid waste mixture; S2, brick making: adding water of whichthe weight is 16% to 25% of the weight of the solid waste mixture into the solid waste mixture obtained in the S1, and then, manufacturing a mould brick through a brick making machine; S3, adding limestone of which the weight is 2% to 8% of the weight of the finished product brick, ferroferric oxide of which the weight is 1% to 4% of the weight of the finished product brick, serpentine of which the weight is 1% to 3% of the weight of the finished product brick, industrial alumina of which the weight is 1% to 2% of the weight of the finished product brick, and sodium silicate of which the weight is 1% to 2% of the weight of the finished product brick into the finished product brick obtained in the S2; and S4, smelting: adding coke of which the weight is 5% to 20% of the weight of the finished product brick into a smelting furnace, then, adding smelting materials obtained in the S3 into the smelting furnace, and turning on the smelting furnace. The smelting technology has the beneficialeffects that normal smelting temperature can be maintained, and fuel cost is controlled; and after manufacturing, the finished product brick is obtained through only natural curing and then is smelted, iron and air fully react to generate more ferric iron during the natural curing process, and the extraction rate of copper is increased.

Description

technical field [0001] The invention relates to the technical field of harmless treatment of magnesium-containing hazardous waste / solid waste by using a pyromelting method, in particular to a smelting process of magnesium-containing hazardous waste / solid waste. Background technique [0002] In the prior art, fire smelting (fire melting) is one of the advanced technologies for the harmless utilization of magnesium-containing hazardous waste / solid waste (solid waste or hazardous waste also contains copper). The raw materials are sintered or brick-made and then added The high-temperature smelting reduction in the melting furnace, the copper metal element or copper-containing compound and FeO, SiO separated by density difference 2 , CaO, MgO, AlO, etc. to recover the valuable metal copper. [0003] Usually magnesium-containing hazardous waste / solid waste comes from different industries. Compared with sulfide ore concentrate, its composition is complex, the content of valuable m...

AI Technical Summary

Problems solved by technology

[0003] Usually magnesium-containing hazardous waste / solid waste comes from different industries. Compared with sulfide ore concentrate, its composition is complex, the content of valuable metal copper is low, and there are many impurity elements.

Especially when the MgO in the raw material is high, the chemical reaction 2MgO+SiO will occur 2 ==Mg 2 SiO 4 with MgO+FeO+SiO 2 ==MgFeSiO 4 , to generate forsterite and forsterite, whose melting point can exceed 1500°C, which will increase the temperature of the smelting furnace and increase the fuel cost; the viscosity of the slag will increase, making it difficult to separate the slag and copper, and it is difficult to discharge copper, which will reduce the recovery rate of smelting; And when the viscosity of the slag phase is too high, it is easy to cause nodules in the furnace, resulting in local overheating and leakage of the furnace body.