A method for producing aerated concrete with water-quenched copper tailings after copper selection and iron extraction
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A technology for aerated concrete and copper tailings is applied in the field of solid waste treatment and utilization and tailings production of aerated concrete. , The effect of improving final strength and reducing product cost
Active Publication Date: 2018-09-21
北京中冶设备研究设计总院有限公司 +1
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The high-temperature slag will form an amorphous structure during the water quenching process, and the crystal grain size of copper minerals is fine and dispersed, and embedded in other minerals in the shape of trees or needles, which will prevent the precipitation and migration of crystal grains. Thereby preventing the growth of the precipitated copper phase particles, even if it is finely ground, it is difficult to dissociate most of the monomer copper particles from the gangue, resulting in a low recovery rate of copper, iron and other metals in the slag, so that the copper tailings can be used for The production of building materials has a certain impact
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[0030] 1. After the water-quenched copper slag accumulated in the copper smelter is subjected to the flotation process for secondary copper selection, and after the rotary kiln high-temperature reduction and firing process for magnetic separation to extract iron, the remaining tailing slag composition requirements are: TFe (full iron) is 8 %, Cu is 0.07%, SiO 2 45%, CaO 30%, Al2 o 3 S is 3.4%, S is 0.1%, and C content is 1%. The particle size of copper tailings is less than 74 μm (200 mesh) and accounts for 95%. After iron extraction, the concentration of copper tailings pulp is usually kept at 60%. It can be directly crushed into the pulping tank; the lime is crushed and ground to 200 mesh, accounting for 95%, and then transported into the lime slurry tank for pulping; the silica sand with a particle size of 3mm is selected and directly made into mortar without any treatment process.
[0031] 2. Transport copper slag, silica sand, lime, and cement into the mixing tank accord...
example 2
[0042] 1. After the water-quenched copper slag accumulated in the copper smelter is subjected to the flotation process for secondary copper selection, and the rotary kiln high-temperature reduction and firing process for magnetic separation to extract iron, the remaining tailing slag composition requirements are: TFe (full iron) is 9 %, Cu is 0.05%, SiO 2 48%, CaO 30%, Al 2 o 3 S is 3.3%, S is 0.1%, and C content is 1%. The particle size of copper tailings is less than 74μm (200 mesh) and accounts for 90%. Pour into the slurry tank without dehydration treatment process; the lime is conventionally crushed and ground to 200 mesh, accounting for more than 95%, and sent into the lime slurry tank for pulping; the ordinary silica sand with a particle size of 2‐4mm is selected and directly produced without any treatment process mortar.
[0043] 2. Convey copper slag, silica sand, lime and cement into the mixing tank for mixing according to weight percentage. The weight percentage ...
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Abstract
The invention provides a method for producing aerated concrete by using water quenching copper tailings being subjected to copper selection iron extraction, wherein the process comprises 1, raw material breaking grinding, 2, pulping, 3, material preparing stirring, 4, casting, 5, static gas forming, 6, cutting, 7, autoclave curing, and 8, discharging out of the kettle and packaging. According to the method, water quenching copper tailings of copper smelting plant is subjected to second copper selections through a flotation process, magnetic separation iron extraction is performed through a rotary kiln high temperature reduction calcination process to obtain a copper tailings ore pulp, and 35-40% by weight of the conveyed tailings ore pulp, 45-50% by weight of silica sand mortar, 10-15% by weight of lime slurry and 3-5% by weight of cement are directly conveyed into a stirring tank according to a certain weight percentage ratio so as to be subjected to mixing stirring without the dehydration and grinding treatment process, wherein the concentration is 55-60%, the curing pressure is 1.3 MPa, the curing temperature is 180-200 DEG C, and the curing time is 8 h. According to the present invention, the environmental pollution problem caused by the copper tailings accumulation is released, the produced aerated concrete building block meets the standard requirement, the production cost is low, the product drying shrinkage value is low, and the comprehensive utilization of the resources and energy-saving emission-reducing are achieved.
Description
Technical field: [0001] The invention relates to the technical field of solid waste treatment and utilization methods, in particular to a method for producing aerated concrete by using water-quenched copper tailings after copper selection and iron extraction. The invention relates to the technical field of comprehensive utilization of non-ferrous smelting slag and building materials, in particular to a production method for producing aerated concrete from the tailings of the copper slag which is water-quenched and cooled after pyrometallurgy and secondary copper extraction and iron extraction. Background technique: [0002] With the development of economy and society, copper output and copper consumption continue to increase. At the same time, in the process of producing and smelting various copper products, a large amount of copper slag will be discharged. my country's copper slag is mainly pyro-smelting slag, with an annual output of more than 1.5 million tons and a total ...
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