Cement clinker and production method thereof

Abstract

The invention relates to a production method of cement clinker. The production method is characterized by comprising the steps that yellow phosphorus slag and / or alkaline slag and limestone, shale and sandy loess are mixed, and ground into raw material by a raw material preparation system. The production method of the cement clinker comprises the following steps of recycling the yellow phosphorus slag and / or the alkaline slag, quickly reacting sulfur and alkaline compounds enriched by a rotary kiln system and a preheater system, and balancing the sulfur and alkaline ratio, so that the SO2 (sulfur dioxide) gas is effectively cured, the refractory sulfate mineral is generated, the standard discharge is realized, the solid-phase reaction degree in the rotary kiln is improved, the particle forming of the clinker in calcining is denser, and the quality of the clinker is more stable. The production method of the cement clinker has the advantages that by compounding the industrial solid wastes to prepare the raw material, the high-investment equipment is not used, the standard discharge is realized, the burnability of the cement raw material is improved, and the energy consumption of the clinker is decreased; the yellow phosphorus slag and the alkaline slag are industrial waste slag, the pollution by industrial waste slag is eliminated by the desulfurizing of the waste slag in the cement kiln, and the effect of changing wastes into valuables is realized.

Description

technical field [0001] The invention relates to the field of cement processing, in particular to a cement clinker and a production method thereof. Background technique [0002] Cement is widely used in the construction industry. Energy saving and emission reduction technology in the cement production process has always been the research focus of the cement production industry. Traditional cement kiln energy saving and emission reduction technologies mainly include the following: [0003] 1. Improve the burner or grate cooler to improve heat exchange and improve the utilization rate of coal combustion; [0004] 2. Purchase coal-fired energy-saving additives to reduce coal consumption; [0005] 3. Improve the use of calciner and denitrification tube, improve the combustion conditions in the furnace, and achieve the discharge of waste gas up to standard; [0006] 4. Build a desulfurization tower or purchase limestone powder for desulfurization; [0007] 5. Use compound des...

AI Technical Summary

Problems solved by technology

[0011] 1. Desulfurization of the desulfurization tower: an additional high-cost desulfurization process is required, with high investment costs, large floor area, long construction period, high desulfurization costs, and high post-operation and maintenance costs, which increase the burden on enterprises;

[0012] 2. Desulfurization of ammonia water, alkali metal salts, sodium organic acid, etc.: additional investment in equipment is required, and the cost of sodium organic acid is relatively high; in addition, ammonia desulfurization not only corrodes metal equipment, but also has great safety risks;

[0013] 3. Composite desulfurization technology: the operating cost is high, and the cost of clinker per ton increases by 2-4 yuan / ton. If water agent is used, the energy consumption of the system will be increased;

[0014] 4. Calcium carbide slag desulfurization: Because some flammable and explosive components such as methane and hydrogen will remain in the preparation of calcium carbide slag, there are potential safety risks for large-scale use

[0015] Generally, the grade of limestone ore used in cement plants fluctuates greatly, and there are many harmful components, such as crystalline silicon, sulfur, etc., which are not conducive to the mineral reaction in the clinker calcination process.

Limestone grade fluctuations can easily lead to severe crusting in the rotary kiln, low 28-day compressive strength of clinker, large coefficient of variation, large quality fluctuations, and high coal consumption in the production process, SO 2 Emissions exceed the standard in stages, resulting in higher costs

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