A kind of preparation method of fully mixed nickel slag ready-mixed concrete

Abstract

The invention relates to a preparation method of premixed concrete fully doped with nickel slag. The method comprises the following steps: (1) carrying out pretreatment on the nickel slag: pouring thenickel slag into a crusher for crushing; then, classifying the crushed nickel slag according to particle sizes, and grinding fine powder again to obtain nickel slag powder; (2) respectively dipping the nickel slag powder, relatively coarse nickel slag and coarse nickel slag into saturated limewater for 1-6 days, fishing out and drying for later use; (3) mixing: mixing the following raw materialsin parts by weight: 190-210 parts of cement, 170-180 parts of water, 150-170 parts of the nickel slag powder, 800 parts of the relatively coarse nickel slag and 1050 parts of the coarse nickel slag. According to the preparation method, the nickel slag is prepared into admixture, fine aggregate and coarse aggregate of the concrete, and the conventional admixture, fine aggregate and coarse aggregatein the concrete are completely replaced with the admixture, the fine aggregate and the coarse aggregate which are prepared from the nickel slag, so that the raw material cost of the concrete is significantly reduced. A certain amount of Mg(OH)2 is generated in a hydration process by using magnesium oxide mineral existing in the nickel slag, so that a certain volume is increased, and a concrete product which has good shrinkage property and even does not shrink can be prepared.

Description

technical field

[0001] The invention relates to the technical field of concrete, in particular to a method for preparing ready-mixed concrete fully mixed with nickel slag. Background technique

[0002] Nickel slag is a kind of industrial waste slag formed during the smelting of nickel alloys. Calculated by the amount of nickel slag discharged per 1 ton of nickel produced in the metallurgical process, about 20-30 tons of nickel slag is discharged. In 2016 alone, the nickel slag produced nationwide reached 3000-4000 tons. The slag was piled up on the open field of the smelting factory nearby, occupying the land and causing environmental and health problems. Therefore, it is urgent to propose an effective way to treat and reuse nickel slag. Yang Dingyi, Li Hao et al. used nickel slag powder and larger particle size nickel slag sand to partially replace cement and sand, respectively, to prepare high-strength and wear-resistant concrete, and its strength grade reached the C40 st...

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