Filling material containing lepidolite slag as well as preparation method and application thereof

Abstract

The invention relates to a filling material for lepidolite slag as well as a preparation method and application of the filling material, and belongs to the technical field of the filling of lepidoliteslag. Slurry formed by mixing the prepared filling material with water has the viscosity close to that of water, is easy to pump (the pumping distance can reach 100-500 m), excellent in thixotropy and short in initial setting time (shorter than 60 s), and overcomes the defects of long initial setting time of a product, proneness of the slurry to flowing, and poor accumulation effect in the priorart. According to the filling material prepared by the invention, 100% consolidation is realized, the highest compressive strength can reach 5MPa, and the problems of poor consolidation performance and low compressive strength of the product in the prior art are solved. According to the high-water-content filling material prepared by the method, complex auxiliary treatment such as filling templatesupporting is not needed in a construction process, and a filling process is simple, and the high-water-content filling material is particularly suitable for meeting a rapid filling requirement underemergency conditions in mines.

Description

technical field [0001] The invention relates to a filling material containing lepidolite slag, a preparation method thereof and an application in mine filling, and belongs to the technical field of filling using lepidolite slag. Background technique [0002] my country's lithium resources are rich in variety and reserves, among which the lithium resources in Jiangxi Province are mainly lepidolite ore, with a reserve of 710,300 tons, which is one of the largest lithium resources mined and utilized in my country. With the rapid development of emerging industries, China's demand for lithium salts is increasing rapidly year by year, and the discharge of lithium slag is also increasing day by day. According to statistics, for every 1 ton of lithium salt produced, about 8-10 tons of lepidolite slag will be produced. On the one hand, a large amount of lepidolite slag will occupy the land, and on the other hand, it will cause secondary pollution to the environment. With the massive ...

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Problems solved by technology

Invention patents CN107417228A and CN105152612A respectively disclose a high-water filling material doped with fly ash and a high-water filling material doped with gravel, which reduces the cost of the filling material, but the final setting strength needs to be further improved (the former 28d The final setting strength only reaches 540kPa; the latter only reaches 755~1140kPa)

Invention patents CN108706922A and CN101792291A respectively disclose a high water expansion filling material, which has the characteristics of good fluidity and high final setting strength, but the initial setting time is long (the initial setting time of the former is 67min-187min; the initial setting time of the latter is 90min-120min ), poor slurry accumulation ability

At present, there is little research on high-water filling materials in China. Existing high-water filling materials generally have problems such as long initial setting time, low slurry viscosity, and easy flow during the filling process. Therefore, it is difficult to achieve precise solidification in the specified area. knot, which brings inconvenience to filling construction and subsequent mining

When using slag doping to prepare high-water materials, there are also quality problems such as poor consolidation performance and reduced mechanical properties of materials

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