Production method of foamed concrete block manufactured from steel slag

Abstract

The invention relates to a production method of a foamed concrete block manufactured from steel slag. The work flow comprises the following steps: 1, taking tailing steel slag after iron dressing; 2, grinding; 3, mixing dry powder; 4, pulping, mixing, and stirring; 5, performing casting molding; 6, foaming; 7, performing static curing; 8, cutting; and 9, performing standard curing. The production method comprises the following specific steps: crushing the steel slag, screening, performing magnetic separation, grading, and drying; performing water quenching on blast furnace slag, and drying; mixing the ground steel slag and ore slag powder with cement clinker, gypsum, lime and the like according to certain weight percents, wherein the ground tailing steel slag powder accounts for 20-60%, the ground ore slag powder accounts for 20-55%, the natural gypsum accounts for 4-10%, the lime accounts for 3-9%, and the cement clinker accounts for 6-12%; mixing and stirring the raw materials, adding water of 40-60 DEG C, and quickly stirring for 1-2 minutes; adding gas-forming aluminum powder, uniformly stirring, and pouring into a mold; and placing in a steam curing box, performing gas forming and steam curing, dismounting the mold, cutting, and curing at normal temperature for 7-12 days. The invention has the following advantages: the produced foamed concrete block meets the requirements of standards; the production cost is low; and comprehensive utilization of resources, energy saving and emission reduction are realized.

Description

Technical field: [0001] The invention relates to the technical field of comprehensive utilization of metallurgical slag and building materials, in particular to a production method of a foam concrete block made of steel slag. Background technique: [0002] In the prior art, metallurgical slag accounts for an increasing proportion of industrial solid waste, and steel slag, as a by-product produced in the steelmaking process, has become one of the most important industrial solid waste in the iron and steel industry. In 2010, the national crude steel output reached 639 million tons, and 89.7 million tons of steel slag was produced nationwide; in 2011, the national crude steel output reached 684 million tons, and the national steel slag produced was about 93.6 million tons, with an average annual growth rate of 4%. If the amount of utilization is not increased, steel slag will occupy more and more land and affect the sustainable development of the iron and steel industry. At pr...

AI Technical Summary

Problems solved by technology

If the amount of utilization is not increased, steel slag will occupy more and more land, affecting the sustainable development of the steel industry

At present, the utilization rate of steel slag in our country is low. The main reasons are: on the one hand, steel slag generally contains about 15% iron oxide components after magnetic separation, in addition to alkaline oxides rich in Ca and Mg components, and There is an RO phase formed with MgO and MnO, which presents a solid solution compound state of slag-coated iron and iron-coated slag. However, if it is to be used, it is very difficult to further select iron, crush and sort, and purify, and the cost will also be greatly increased. Therefore, most of the low-grade iron-containing steel slag has not been effectively recycled, which has further caused environmental pollution and waste of resources; another reason for the difficulty in utilization is that the f-CaO and f-MgO contained in it are higher than that of cement clinker. Formed at high temperature, dense structure, very slow hydration, f-CaO forms Ca(OH) when it meets water 2 , the volume expansion is 98%; f-MgO forms Mg(OH) when it meets water 2 , the volume expansion is 148%, and it is easy to cause cracking of concrete roads and other building materials mixed with steel slag due to expansion in the hardened cement paste

Images