Curing agent for dry iron tailing stack and preparation method of curing agent

Abstract

The invention discloses a curing agent for a dry iron tailing stack and a preparation method of the curing agent, belonging to the technical field of mine safety. The curing agent is composed of curing agent clinker and an excitant, wherein the curing agent clinker comprises the basic components in parts by mass: 46-50 parts of CaO, 12-18 parts of MgO, 20-25 parts of SiO2, 8-12 parts of Al2O3 and 1-2 parts of mineralizing agent. The preparation method comprises the steps of firstly, grinding a CaO and MgO enriched raw material, an Al2O3 and SiO2 enriched raw material and the mineralizing agent; then, feeding the ground powder into a balling dish to prepare curing agent clinker powder; and finally, adding excitant powder into the curing agent clinker powder, stirring and uniformly mixing to obtain the curing agent for the dry iron tailing stack. The curing agent prepared by the invention is strong in curing capacity, relatively low in raw material cost and favorable in large-scale popularization and application prospects.

Description

technical field [0001] The invention belongs to the technical field of mine safety, and in particular relates to a curing agent for dry stacking of iron tailings and a preparation method thereof. Background technique [0002] After the iron ore is crushed, ball milled, and wet-processed, it will produce a low-grade tailings slurry mainly composed of gangue, which accounts for more than 1 times the amount of the original ore. The tailings slurry contains more than 30% of water, and the tailings in the tailings slurry Fine particles, strong water holding capacity, high water content and low comprehensive utilization rate. During the process of stockpiling the tailings pond, the level of the tailings slurry will be higher and higher from the ground, so there is a risk of dam failure and a large amount of cultivated land will be occupied. my country is a big mining country, and more than 90% of the tailings are stored in the upstream dam. In recent years, tailings dam collapse ...

AI Technical Summary

Problems solved by technology

The advantage of this method is that after the dam is completed, the operating cost is low and the process is simple; the main problems are that the one-time dam construction investment is large, the land occupation is large, and the tailings are in a saturated water state for a long time, which poses a huge safety risk

The advantage of this method is that it does not require high requirements for the tailings pond and does not require drainage facilities. The problem is that it is very difficult to transport the tailings under high-concentration conditions. In fact, the requirements for the venue are also very strict.

However, after using a large amount of finely ground industrial waste residue in the curing agent used in this method, the strength of the solidified body is low, and the compressive strength for 7 days is less than 0.2MPa. The amount of curing agent used is large, and there is still a problem that dry stacking is difficult. Especially in the rainy season in the south, the unsolidified tailings will be muddy again into tailings slurry