阅读说明：本技术 一种矿井采空区充填料浆制备方法 (Preparation method of filling slurry in mine goaf ) 是由 王良军 何昭权 王双 李晓军 张远宁 何明模 王茂彦 胡应文 于 2019-11-16 设计创作，主要内容包括：本发明提供一种矿井采空区充填料浆制备方法,包括以下步骤：步骤一：采集获得尾矿浆,将该尾矿浆进行消气处理之后,再向其中加入絮凝剂进行浓密处理,获得底流尾矿浆；步骤二：向步骤一中所述底流尾矿浆中加入碱性介质,调整底流尾矿浆的pH值为6.8至7.2,使用尾矿压滤机对部分底流尾矿浆进行压滤处理之后获得干式尾矿；步骤三：将步骤二中所述干式尾矿与未经过压滤处理的底流尾矿浆进行均匀拌和,并加入适量胶结材料,获得浓度为70％至75％的矿井采空区充填料浆。采用本发明提供的矿井采空区充填料浆进行充填不会对管道造成腐蚀,不会破坏采空区地下水资源,保护了环境,其制备工艺过程简单,降低了制备成本。(The invention provides a preparation method of mine goaf filling slurry, which comprises the following steps: the method comprises the following steps: collecting and obtaining tailing slurry, performing degassing treatment on the tailing slurry, and then adding a flocculating agent into the tailing slurry for thickening treatment to obtain underflow tailing slurry; step two: adding an alkaline medium into the underflow tailing slurry in the step one, adjusting the pH value of the underflow tailing slurry to be 6.8-7.2, and performing filter pressing treatment on part of the underflow tailing slurry by using a tailing filter press to obtain dry tailings; step three: and (3) uniformly mixing the dry tailings in the step (II) with underflow tailing slurry which is not subjected to filtering treatment, and adding a proper amount of cementing materials to obtain mine goaf filling slurry with the concentration of 70-75%. The mine goaf filling slurry provided by the invention can not corrode a pipeline when being filled, can not damage underground water resources of the goaf, protects the environment, has a simple preparation process and reduces the preparation cost.)

1. A preparation method of mine goaf filling slurry is characterized by comprising the following steps: the method comprises the following steps:

the method comprises the following steps: collecting and obtaining tailing slurry, performing degassing treatment on the tailing slurry, and then adding a flocculating agent into the tailing slurry for thickening treatment to obtain underflow tailing slurry;

step two: adding an alkaline medium into the underflow tailing slurry in the step one, adjusting the pH value of the underflow tailing slurry to be 6.8-7.2, and performing filter pressing treatment on part of the underflow tailing slurry by using a tailing filter press to obtain dry tailings;

step three: and (3) uniformly mixing the dry tailings in the step (II) with underflow tailing slurry which is not subjected to filtering treatment, and adding a proper amount of cementing materials to obtain mine goaf filling slurry with the concentration of 75-85%.

2. The method for preparing filling slurry for mine goaf according to claim 1, characterized in that: in the first step, the concentration of the tailing pulp is 15% -20%.

3. The method for preparing filling slurry for mine goaf according to claim 1, characterized in that: the step one, the tail ore pulp is subjected to gas elimination treatment, namely the tail ore pulp is conveyed into a gas elimination tank of a thickener by adopting a pressurizing conveying method to be subjected to gas elimination treatment, and the tail ore pulp is conveyed into the thickener to be subjected to thickening treatment after the gas elimination treatment.

4. The method for preparing filling slurry for mine goaf according to claim 1, characterized in that: the concentration of the underflow tailing pulp in the first step is 50-58%.

5. The method for preparing filling slurry for mine goaf according to claim 1, characterized in that: in the second step, the alkaline medium is lime milk.

6. The method for preparing filling slurry for mine goaf according to claim 1, characterized in that: and in the second step, the water content of the dry tailings is 10-15%.

7. The method for preparing filling slurry for mine goaf according to claim 1, characterized in that: in the third step, the weight ratio of the underflow tailing pulp which is not subjected to filter pressing treatment to all the underflow tailing pulp is 40-50%.

Technical Field

The invention belongs to the technical field of mining engineering, and particularly relates to a preparation method of mine goaf filling slurry.

Background

The filling mining method has been developed in China for decades, and particularly, the filling mining method has become a mining method with high strength, high efficiency and high benefit along with the progress of mining equipment and filling technology in the last two decades. The full-tailing cemented filling method has industrial ecological functions of improving the resource utilization rate, preventing surface subsidence, fully utilizing solid waste generated by mines, reducing ecological environment damage and the like. The traditional tailing filling technology in China mostly uses a vertical sand silo to store tailing slurry, a cyclone is adopted to classify the tailing slurry, coarse fraction enters a filling system, fine fraction does not enter the filling system, and full tailing filling is not realized. A domestic full-tailings cemented filling system also adopts a plurality of sets of process equipment such as cyclone classification, secondary concentration classification and the like to realize full-tailings filling, but the technical process is complex, needs a plurality of sets of process equipment, has overhigh capital investment and high energy consumption of the whole system in operation. However, in order to realize full tailing cementing and filling in the full tailing cementing and filling technology adopted in the prior art, technological processes such as cyclone classification, secondary dense classification, aggregate supply of a vertical sand silo, water supply of a water supply device for a stirring system and the like need to be adopted, the technological process is complex, multiple sets of technological equipment are needed, the capital investment is too high, the operation energy consumption of the whole system is high, and the filling cost is high.

Disclosure of Invention

In order to solve the technical problem, the invention provides a preparation method of mine goaf filling slurry.

The invention is realized by the following technical scheme.

The invention provides a preparation method of mine goaf filling slurry, which comprises the following steps:

the method comprises the following steps: collecting and obtaining tailing slurry, performing degassing treatment on the tailing slurry, and then adding a flocculating agent into the tailing slurry for thickening treatment to obtain underflow tailing slurry;

step two: adding an alkaline medium into the underflow tailing slurry in the step one, adjusting the pH value of the underflow tailing slurry to be 6.8-7.2, and performing filter pressing treatment on part of the underflow tailing slurry by using a tailing filter press to obtain dry tailings;

step three: and (3) uniformly mixing the dry tailings in the step (II) with underflow tailing slurry which is not subjected to filtering treatment, and adding a proper amount of cementing materials to obtain mine goaf filling slurry with the concentration of 70-75%.

In the first step, the concentration of the tailing pulp is 15% -20%.

The step one, the tail ore pulp is subjected to gas elimination treatment, namely the tail ore pulp is conveyed into a gas elimination tank of a thickener by adopting a pressurizing conveying method to be subjected to gas elimination treatment, and the tail ore pulp is conveyed into the thickener to be subjected to thickening treatment after the gas elimination treatment.

The concentration of the underflow tailing pulp in the first step is 50-58%.

In the second step, the alkaline medium is lime milk.

And in the second step, the water content of the dry tailings is 10-15%.

In the third step, the weight ratio of the underflow tailing pulp which is not subjected to filter pressing treatment to all the underflow tailing pulp is 40-50%.

The invention has the beneficial effects that: by adopting the technical scheme of the invention, rotational flow grading equipment is not needed, secondary thickening is not needed to be carried out on the graded fine fraction, aggregate feeding is carried out on the filling system after the thickening is carried out by adopting the vertical sand silo, and the full-tailing cemented filling can be realized without adopting a water supply device to supply water to the stirring system. In addition, the pH value of underflow tailing slurry is adjusted to be neutral by adding an alkaline medium in the process of preparing the filling slurry of the mine goaf, a good foundation is laid for improving the later-stage filter pressing efficiency, the corresponding filling pipeline is not corroded when the filling slurry of the mine goaf is filled, the filling pipeline is protected, the service life of the filling pipeline is prolonged, meanwhile, the underground water resources around the mine goaf cannot be influenced after the filling slurry of the mine goaf is filled, and the environment around a stope is protected.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.