Method for producing calcium carbide raw materials through carbide slag

Abstract

The invention relates to the field of carbide slag recycling in calcium carbide method acetylene production, in particular to a method that after physical separation is performed on carbide slag impurities, a calcium hydroxide component in the carbide slag impurities is extracted, and then calcium carbide raw materials are produced through carbide slag. The method for producing the calcium carbide raw materials through the carbide slag mainly comprises the following steps of fresh carbide slag screening; magnetic separating; ore grinding; ore pulp preparing; suspension separating; dewatering; carbon mixing, wherein filter cakes which are obtained after dewatering is performed and contain certain moisture are mixed with carbon material particles of which the particle size is smaller than or equal to 2 mm and the fixed carbon content is larger than or equal to 70% in a mixing machine according to the mass fraction ratio of 1.63:1-2.91:1; granulating and forming; drying; calcining. According to the method for producing the calcium carbide raw materials through the carbide slag, the shortcomings and defects in the prior art can be effectively overcome, reclamation recycling of the carbide slag is achieved, the impurities in the carbide slag can be effectively removed, the technology is simple and convenient, and the economical efficiency and practicability are achieved.

Description

technical field [0001] The invention relates to the field of recycling calcium carbide slag in the production of acetylene by the calcium carbide method, in particular to a method for physically separating impurities in calcium carbide slag and extracting calcium hydroxide therein, and using the calcium carbide slag to produce calcium carbide raw materials. Background technique [0002] Carbide slag is a solid waste residue with calcium hydroxide as the main component obtained after calcium carbide is used to prepare acetylene. It also contains silicon oxide, aluminum oxide, and a small amount of impurities such as calcium carbonate, ferric oxide, magnesium oxide, and carbon slag. It not only occupies land , and pollute the environment. The main component of calcium carbide slag is calcium hydroxide. In theory, by removing harmful impurities such as silicon, iron, aluminum, and magnesium in calcium carbide slag, it can be used as a raw material for calcium carbide production...

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Problems solved by technology

[0007] Chinese patent application 201010157724.9 discloses a method for using calcium carbide slag in the material circulation system of the calcium carbide industry. removal, synthetic calcium carbide is mixed with calcined calcium oxide and carbon, which is very different from the present invention in technology

[0008] Chinese patent application 201310179710.0 is a method for preparing high-purity calcium hydroxide by using carbide slag. A high-speed disperser is used to disperse the agglomerated particles of carbide slag, and the calcium carbide slag is not processed. Carry out magnetic separation, compared with the present invention, the present invention adopts magnetic separation process, while removing iron impurity in calcium carbide slag, realized the extraction of ferrosilicon in carbide slag, greatly improved the production added value of carbide slag, simultaneously this The invention adopts the grinding process to disperse the agglomerated particles of carbide slag, which can ensure the effective dispersion of the agglomerated particles of carbide slag; it is a simple and efficient method to use hydrocyclone to remove impurities from carbide slag, but the separation performance of hydrocyclone Affected by its structural parameters, operating parameters, and material properties, the patented method only separates and removes impurities by changing the basic diameter of the hydrocyclone and the diameter of the bottom flow port, and does not affect the hydrocyclone. The inlet diameter, overflow port diameter, overflow pipe insertion depth and inlet velocity of the separation performance are selected, and the separation performance and separation effect are limited.

Chinese patent application 200910064352.2, a production process for preparing calcium hydroxide by using calcium carbide slag. It is difficult to effectively remove impurities and obtain higher purity hydrogen by simple screening or simple hydrocyclone for separation and removal of impurities. Calcium oxide products, and will cause a lot of waste of carbide slag

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