High-concentration full-tailing self-flow filling cementing material for phosphate rock mountain

Abstract

The invention discloses a high-concentration full-tailing self-flow filling cementing material for a phosphorite mountain. The cementing material comprises the following raw materials: 24-40 wt% of phosphogypsum, 30-40 wt% of phosphorus slag powder, 8-18 wt% of cement, 3-15 wt% of an alkaline activator, 1-2 wt% of an air entraining component and 1-3 wt% of modified vegetable gum, the modified vegetable gum is prepared by the following steps: dissolving vegetable gum, an esterified monomer and sodium methacryloyl sulfonate in water, heating to 70-85 DEG C, dropwise adding an initiator for reaction, and drying. The cementing material provided by the invention is developed for a high-concentration full-tailing self-flow filling process (the slurry mass concentration is greater than or equal to 80%), the tailings are kept stable for a long time in the gelling material without deposition and almost without bleeding by adding the modified vegetable gum, and the prepared full-tailing filling slurry is good in fluidity, does not need to be pumped and is more beneficial to transportation and filling. The roof contact requirement of a mine filling body can be met to a greater extent; the strength of the solidified filling slurry is more than two times that of the filling slurry prepared by taking ordinary cement as a cementing material; and the raw material cost is low, the transportation distance is short, and the corresponding product cost is low.

Description

technical field [0001] The invention belongs to the technical field of mine filling and specifically designs a cementitious material for filling phosphate mines. Background technique [0002] In today's phosphate rock mining industry, phosphate rock enterprises are generally involved in the production of phosphoric acid, yellow phosphorus and other products. However, the production of 1 ton of phosphoric acid will produce 3 to 5 tons of phosphogypsum. Phosphogypsum contains impurities such as phosphoric acid, P, and F, and long-term storage may easily cause surface / ground water pollution. The production of yellow phosphorus will also produce a large amount of phosphorus slag, which has certain activity and can be used in the cement concrete industry, but the P in phosphorus slag 2 o 5 and F will affect the setting time of cement and the early strength of concrete, and the market capacity is limited, only part of the phosphorus slag can be consumed. At the same time, in th...

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Problems solved by technology

In this patent, expansion agents or fibers are added in order to improve the strength and crack resistance of the filling body, but in fact, the filling body generally does not need to resist cracking, and low shrinkage cannot solve the problem of filling and roofing, and the strength of the filling body in this patent is not good. There is a significant increase, but the cost of cementitious materials is higher

[0009] Some technical researches in other materials mainly partially solve some problems in phosphate mine filling through the combined use of coarse-grained materials such as river sand and rod sand, low-concentration filling, addition of early-strength agents, or pretreatment of phosphogypsum. However, none of them can take into account the consumption of ore dressing tailings and phosphorus chemical solid waste, reduce the cost of mine filling rubber materials, prevent environmental pollution caused by filling body bleeding, and ensure the above-mentioned needs of filling body performance.

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