Wet treatment method of iron and steel slag

Abstract

The invention provides an iron and steel slag wet process processing method. The iron and steel slag wet process processing method comprises the following steps: continuously sprinkling circulating water on a slag tank at the speed of 15-20t / h, stopping sprinkling water until the cooling water reaches a tank opening, and air-cooling until the water in the tank is thoroughly evaporated; digging flat or digging out slag higher than a trunnion by an excavator or inserting an exhaust hole by a machine with a special rod drill; repeating the water sprinkling procedure, and irregularly measuring the temperature of the middle and lower part of the slag tank; if the temperature is lower than 200 DEG C, intermittently sprinkling water for 1-2 hours, ensuring that water accumulated on the surface of the iron and steel slag in the slag tank does not exceed 2 centimeters, stopping sprinkling water after the temperature of the middle and lower part of the slag tank reaches 100 DEG C more or less, and carrying out tank stirring operation. The water sprinkling procedure is dynamically regulated according to the slag quantity and the cooling water quantity in the tank, slag stirring time is scientifically and visually determined according to the temperature of the slag tank, procedure key points are easily verified by an operator, the technology is easy to execute and practical, thorough and uniform iron and steel slag soaking is ensured, dust fly is prevented from occurring in the slag stirring process, and an environment-friendly effect is realized.

Description

technical field [0001] The invention relates to the technical field of metallurgical slag treatment, in particular to a method for wet treatment of steel slag. Background technique [0002] Metallurgical steel plants discharge about 100 million tons of iron and steel slag every year. When the iron and steel slag is discharged, it is liquid and molten. Morphology), and many useful ingredients such as a large number of oxide complexes and beneficial elements. Moreover, many steel slags need to be piled up in large quantities because they have not been effectively processed and utilized, which not only directly occupies a large amount of farmland, but also has a large amount of dust and rainwater washing away, causing calcium oxide to dissolve in water, causing the nearby soil to become alkaline, and the pH value of nearby waters or rivers It has seriously polluted the surrounding environment and constituted a difficult point in the environmental management of iron and steel e...

AI Technical Summary

Problems solved by technology

[0004] 1. There are standards on the original slag tank loading process, and the wet treatment process parameters are formulated for the original slag loading capacity. At present, after the smelting ratio of various types of steel is increased, the steel slag volume of a single tank is increased to 1.5-1.8 times the original slag volume , when the slag tank is not adjusted, the original wet process parameters are used, resulting in incomplete and uneven soaking, more water in the upper layer during the slag turning process, a large amount of dust in the lower layer, and some high-temperature slag that has not been soaked thoroughly. In liquid state, it will explode when it encounters water during the pouring process, which not only has environmental protection problems, but also has potential safety hazards

If the amount of slag in the tank is reduced, the transportation cost of the slag tanker and the investment in the slag tank will inevitably increase. If the amount of slag is not reduced, the watering and soaking time will be extended by 1.5-1.8 times, and the production rhythm is not allowed. The defects of traditional technology are becoming more and more prominent.

[0005] 2. After the proportion of the existing steel slag is increased, the load is relatively full. Once soaked in water, the steel slag has the characteristics of wet expansion and shrinkage. After the steel slag expands, it is higher than the tank mouth. The hydration and infiltration of slag will cause a lot of dust, and the environmental protection problem is very serious.

Images