Filling and consolidating powder for mining purposes and use thereof

Abstract

The invention discloses filling and consolidating powder for mining purposes and a use thereof. The filling and consolidating powder comprises the following raw materials in percentage by weight: 3-5% of portland cement clinker, 8-10% of metakaolin, 5-15% of carbide slag, 18-24% of phosphogypsum, 18-22% of fly ash, 9-14% of red mud, 15-19% of blast furnace slag, 4-10% of limestone, 0.8-1.2% of polycarboxylic acid type water reducing agent and 0.4-0.7% of sodium hydroxide and is prepared by uniformly mixing and grinding to get fine powder with 400 meshes-600 meshes. When the filling and consolidating powder is used, mining tailing or coal gangue is firstly mixed with water according to a proportion in a mixing machine for forming uniform slurry, and then the consolidating powder is further added, uniformly mixed and then conveyed to a downhole place by a pipeline for filling. The cost of the filling material blended by the consolidating powder disclosed by the invention is 50-70 yuan/ton, while the cost of the similar filling and consolidating powder is 90-110 yuan/ton; and compared with the prior art, the cost is greatly reduced and the filling effect is good.

Description

technical field [0001] The invention relates to a consolidation material for filling, especially a cementitious material for filling goafs in mines including coal mines and metal mines. Background technique [0002] With the continuous development of the national economy, the mining industry is also developing rapidly. However, when the mining of mineral resources ends, a large number of gobs will be formed underground, causing a large number of potential safety hazards to the country and people. At present, mine filling is an ideal way to solve the goaf, and in the mine filling process, filling cementing material plays a key role. In the traditional filling process, the filling cement material used is mainly cement. However, when cement is used as the cementing material, there are the following problems: the fluidity of the mixture during filling is poor, the early strength is low, and the cost is high. Granules, cement can not play its due role. There are also literatur...

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Problems solved by technology

However, when cement is used as the cementing material, there are the following problems: the fluidity of the mixture during filling is poor, the early strength is low, and the cost is high. particles, the cement cannot play its due role

[0004] Chinese Patent Publication No. CN1500762A (Application No. 02135821.4) discloses a single-slurry cemented filling material and its application method. It is made of rapid-hardening sulphoaluminate clinker, phosphogypsum, quicklime, bentonite and slag according to the ratio of mixing and grinding. The rapid-hardening sulfoaluminate clinker accounts for 15-25%. The cemented filling material produced by this method contains more rapid-hardening sulfoaluminate clinker. Although the early strength is high, due to the rapid-hardening sulfur The price of aluminate clinker is relatively high, and the mixing ratio of the cementing material and tailings sand is only 1: (3-5), so the cost of this cemented filling material is relatively high, and the filling cost is also high

This technology uses more Portland cement clinker, although the early strength is high, but the cost is also high, and the fluidity is poor after mixing with tailings

[0007] In short, the filling and consolidation materials disclosed in the existing literature cannot achieve the goals of good fluidity, high early strength, and low cost at the same time.

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