A kind of cement admixture, preparation method and application
A technology for cement admixtures and raw materials, which is applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of maximizing resource utilization, high cost, complex treatment process, etc. Simple preparation process and strong operability
Active Publication Date: 2021-10-29
UNIV OF SCI & TECH BEIJING
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Problems solved by technology
[0007] The purpose of the present invention is to solve the problems that the above two kinds of solid wastes cannot realize the maximization of resource utilization, high cost and complicated treatment process at the same time, and provide a cement admixture, a preparation method and its application. The method combines electrolytic manganese slag, red mud Mixing, use the different acidity and alkalinity of the two solid wastes to make the mixed system depolymerize and gel the Si-O and Al-O in the mixed system under alkaline conditions, under the conditions of inert gas, high temperature and high pressure The activity is improved; at the same time, the ammonia nitrogen in the electrolytic manganese slag decomposes into ammonia gas, and the Fe in the mixed system 2 o 3 is reduced to Fe 3 o 4 , Fe 3 o 4 Separation and recovery by magnetic separation to realize resource recovery of iron ore
Method used
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preparation example 1
[0034] 1) Add 12 parts of high-iron red mud with a pH of 11.2, 10 parts of electrolytic manganese slag with a pH of 6.1, and 1 part of water into a closed reactor in a nitrogen atmosphere, stir evenly at 25°C, and let stand for 2 hours;
[0035] 2) Continue to fill the reactor with nitrogen to pressurize to 3×10 in step 1) 5 Pa, and heated up to 650°C, kept stirring for 1h;
[0036] 3) Release the pressure, cool the reaction product in the reactor to 25°C with the furnace, take out the reaction product, grind it to a particle size of 60 μm, and separate the magnetic substance Fe by magnetic separation 3 o 4 , to have a cement admixture with gelling activity.
preparation example 2
[0038] The rest is the same as Preparation Example 1, except that the amount of high-iron red mud is 10 parts.
preparation example 3
[0040] The rest are the same as in Preparation Example 1, except that the amount of electrolytic manganese slag is 14 parts.
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A cement admixture, preparation method and application, the cement admixture includes the following raw materials, high-iron red mud, electrolytic manganese slag, water, and the cement admixture is composed of three raw materials in an inert gas under high pressure, It is obtained by reaction under high temperature conditions. The preparation method of the cement admixture of the present invention can simultaneously process high-iron red mud and electrolytic manganese slag, maximize resource utilization of the two solid wastes, reduce environmental pollution, and has simple preparation process and strong operability, and is suitable for large-scale production. The preparation method of the cement admixture of the present invention can also make Fe in the high-iron red mud 2 o 3 converted to Fe 3 o 4 , to realize resource recovery of iron ore in high-iron red mud. The cement admixture prepared by the invention has sufficient raw materials and low cost, and the prepared admixture has high gelling activity, and can partially replace cement for the preparation of building materials.
Description
technical field [0001] The invention belongs to the technical field of resource utilization of industrial solid waste, and in particular relates to a cement admixture, a preparation method and an application. Background technique [0002] The shortage of resources and the deterioration of the ecological environment are two major problems in the development of human society at present, and they are widely concerned and valued. In the final analysis, environmental pollution is that resources have not been fully and rationally utilized. The fundamental method to solve resource shortage and environmental pollution is to make resources fully and rationally utilized. In recent decades, my country's economy has entered a period of rapid growth, and the output of solid waste has also increased rapidly. Among them, the output of industrial solid waste is the highest compared with domestic solid waste and agricultural solid waste, and it is also the most difficult to recycle. To enabl...
Claims
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IPC IPC(8): C04B18/14C04B28/00
CPCC04B28/00C04B40/0039C04B2201/50C04B18/144C04B18/0409Y02W30/91
Inventor 刘晓明王亚光鲁阳郝先胜张未薛阳
Owner UNIV OF SCI & TECH BEIJING