A method for removing non-calcareous mineral impurities in carbide slag
A calcareous mineral, carbide slag technology, applied in chemical instruments and methods, calcium/strontium/barium oxide/hydroxide, wet separation, etc. Problems such as low removal of clay minerals, and meaningless extraction of ferrosilicon impurities by magnetic separation
Active Publication Date: 2021-07-27
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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Problems solved by technology
The patent introduces the Ca(OH) in the cyclone separation slurry 2 The purity can reach 96%, but there are still shortcomings in the technical scheme of sorting and removing impurities after careful exploration: (1) Like the previous patented technology, it cannot remove fine clay mineral impurities; nor can it make the calcareous minerals present stable Single mineral dispersion form ensures the separation effect of the cyclone
(2) It is meaningless to extract ferrosilicon impurities by magnetic separation from -180μm carbide slag fines
[0006] To sum up, the existing methods for removing non-calcareous impurity minerals in calcium carbide slag have low removal capacity of submicron fine-grained clay minerals, and the removal capacity of quartz, mullite, and albite micron-level cyclone less, the problem of obtaining calcium raw material product purity is still low
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[0028] The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.
[0029] like figure 1 As shown, a method for removing non-calcareous mineral impurities in calcium carbide slag of the present invention comprises the following steps:
[0030] Step Ⅰ, sieving with 315μm sieve
[0031] Dry sieve carbide slag raw materials with a sieve mesh size of 315 μm, and use an electromagnetic three-dimensional vibrating sieve or an ultrasonic vibrating sieve for the sieving instrument. The oversize material (+315μm) is the material containing impurities; the undersize material (-315μm) is the primary purified carbide slag material.
[0032] Step II 1 , dry magnetic separation
[0033] The ferrosilicon material in the +315μm calcium carbide slag was extracted by dry magnetic separation with a magnetic separator, and the remaining non-magnetic material was impurity 1. Ferrosilicon is a strong magnetic mineral, so a magne...
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A method for removing non-calcium mineral impurities in calcium carbide slag, dry sieving calcium carbide slag raw materials with a sieve size of 315 μm, secondary screening of under-sieve materials with a sieve size of 18 μm, secondary sieving Add water and dispersant to the material to make a slurry, grind it in a ball mill to make a suspension of calcium carbide slag, pump it into a hydrocyclone for classification and sorting, filter the overflow material, and sort it to obtain the final product high calcium carbide slag . The invention adopts a physical method to sort carbide slag raw materials to obtain high-calcium carbide slag material and ferrosilicon material products, and selects impurity materials three times during the sorting process. The present invention removes clay minerals during the screening and sorting process, thereby increasing the calcined base CaO content in the calcium carbide slag slurry, and at the same time improving the sorting efficiency of the cyclone because the dispersant is used to make a uniform suspension.
Description
technical field [0001] The invention belongs to the technical field of calcium carbide slag resource utilization, in particular to a method for removing non-calcareous mineral impurities in calcium carbide slag. Background technique [0002] Carbide slag is the off-white solid residue produced when calcium carbide reacts with water to generate acetylene gas, containing about 85-95% Ca(OH) 2 , 1~10%CaCO 3 , 1 to 3% unreacted carbon particles, quartz, silicon compounds and silicates. The resource utilization of calcium carbide slag includes two ways: direct utilization and reutilization after processing. The common large-scale direct utilization method is as a raw material or material for cement production, soil improvement, and acid wastewater treatment. Due to the limited amount of carbide slag directly used by local production enterprises, the high cost of transporting this low-value material across regions, and the limitation of the technical conditions and technical le...
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IPC IPC(8): B03B7/00C01F11/16
CPCB03B7/00C01F11/16C01P2006/80
Inventor 侯新凯石一鸣王丹郭海涛武志江刘犇李周赵炜
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY