Sintered product of rejects and shale modular cellular bricks and preparing method thereof

Abstract

The invention discloses a sintered product of rejects and shale modular cellular bricks and a preparing method thereof. The preparing method of the product comprises the following steps of: ensuring that the raw material with the fineness being lower than 0.5 to 0.25 mm occupies 65 percent of all the raw materials through rough crushing, fine crushing and sifting; blending rejects and shale in proportion by weight of 70 to 85 percent: 15 to 30 percent, and adding water and uniformly stirring, and putting the material into a storage warehouse to be stored, wherein the quantity of water added is excessive; feeding the stored material into a molding machine to be conducted to semi-hard plastic extrusion molding; sintering at the maximum temperature of 1000 to 1080 DEG C for 8 to 16 hours; ensuring that the firing time is 28 to 36 hours; and slacking the material in water after kiln discharging and sorting. The main material of the product adopts rejects which are abandoned by most mines and required to be conducted to safe disposal, the preparing method can effectively and conjunctively utilize rejects, change waste into valuable, meet the requirements of energy saving and emission reduction, and achieve significant social benefit and economic benefit.

Description

technical field [0001] The invention belongs to new building wall materials, in particular to a sintered product of mining and dressing waste shale modulus porous brick and a preparation method thereof. Background technique [0002] Coal gangue, iron tailings, copper tailings, sand tailings and other mining and dressing wastes pile up like mountains in many areas of our country, not only occupying land, but also seriously polluting the environment. In the prior art, all coal gangue can be used to make bricks, but the raw material of coal gangue has a high calorific value, which not only reduces the production capacity of the roasting kiln, but also causes serious problems of frosting. There are also bricks made by mixing and pulverizing coal gangue and shale. The development direction of coal gangue sintered products is porous, energy-saving, high-strength and decorative. For porous bricks, the fine-grained particles of the broken raw materials are less than 2mm, and the pa...

AI Technical Summary

Problems solved by technology

However, for mining and dressing waste, due to the uncertainty of the mining point, the content of harmful minerals fluctuates greatly compared to the requirements of the sintered brick making process, and it is difficult to control, that is, if the following problems cannot be solved according to the existing process: (1) reach If it does not meet the basic requirements of plasticity required for molding, that is, it cannot be bonded, and it will be crisp and loose during molding, and the green body cannot be formed; Homogenization of raw materials can be achieved, but the pre-purification of harmful components in raw materials cannot be realized; (3) Ca2+ and Mg2+ cannot be fully realized during the sintering process Carry out effective chemical reaction, make it fix with stable compound, can't reach and reduce the amount of harmful free CaO and MgO; It pollutes the environment and endangers the health of the operators; (5) After a period of time, the finished products will explode in a self-decomposing manner

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