Method for preparing natural hydraulic lime with lead and zinc mine tailings
A technology of natural water and tailings, applied in the field of preparing natural hydraulic lime, can solve the problems that the research and development of natural hydraulic lime is still blank
Inactive Publication Date: 2015-01-21
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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At present, the domestic research and development of natural hydraulic lime is still blank
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[0020] see figure 1 Shown, according to the technical scheme of the present invention, a kind of method that utilizes lead-zinc tailings to prepare natural hydraulic lime, the lead-zinc tailings that meet the requirement is main raw material, and the silicon dioxide in this lead-zinc tailings must dissolve into Calcium oxide with fine particles and uniform distribution; use high-purity limestone to adjust the ratio of calcium oxide and silicon oxide (CaO / SiO2) in lead-zinc tailings 2 =2.86-3.33), the alumina content is not more than 4.5%, to control the content of hydraulic products in the product, add 0.5-0.8% boron oxide of the total amount of lead-zinc tailings, and sodium oxide in the lead-zinc tailings, Potassium oxide and other impurities form a glass phase with low hydration activity and low hydration heat value, which improves the strength in the later stage and reduces the "frosting" of soluble salts.
[0021] Lead-zinc tailings are fully co-ground with high-purity l...
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The invention discloses a method for preparing natural hydraulic lime with lead and zinc mine tailings. The method comprises the steps of taking the lead and zinc mine tailings as a major raw material, adding boron oxide, wherein the boron oxide and impurities, such as sodium oxide and potassium oxide, in the lead and zinc mine tailings form a glass phase with low hydration activity and a low hydration heat value, improving later strength, adjusting a ratio of calcium oxide to silicon oxide by adding high-purity limestone, controlling an aluminum oxide content, mixing and grinding ingredients for 6-10h with a ball mill, adding a temporary binding agent to press into a ball or a cylinder, drying, putting in a furnace for roasting for 3h at 1000-1050 DEG C, blowing and quenching the roasted material in air to the room temperature, measuring a free calcium oxide content in a roasted product, putting the roasted product in an environment with the humidity of 50-80% for digestion, recording weights of the product before and after the digestion, calculating digestibility of free calcium oxide according to a measured weight gain of the product after the digestion, finishing the digestion procedure when the digestibility of free calcium oxide reaches 98%, and obtaining the satisfactory hydraulic lime.
Description
technical field [0001] The invention relates to a method for preparing a building material that combines hydraulic and air hardness in the protection of cultural relics in the construction industry, the repair and reinforcement of ancient buildings, and the application of colored decorative dry powder mortar and fair-faced concrete. The prepared material is mainly used for cultural relics The invention relates to the protection and repair and reinforcement of ancient buildings, in particular to a method for preparing natural hydraulic lime from lead-zinc tailings. Background technique [0002] Natural hydraulic lime (Natural Hydraulic Limes, NHL) refers to the use of impure impurity-containing limestone after firing, crushing, and digestion. It has the advantages of lime and cement, low shrinkage, salt resistance, and moderate compression resistance. Flexural strength of a class of cementitious materials. Natural hydraulic lime is different from traditional air-hardening li...
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IPC IPC(8): C04B2/10
Inventor 薛群虎武志红徐亮石振武
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY