Method for preparing cement concrete early strength agent by using industrial residue

Abstract

The invention discloses a preparation method of cement concrete early strength agent by using industrial residue, and belongs to the manufacturing method of cement additive. The industrial residue red mud is used as the main raw material, and the industrial residue acetylene sludge and desulfurized gypsum are used as auxiliary, wherein the mass percent of the materials is as follows: 75-85% of red mud, 10-15% of acetylene sludge and 5-10% of desulfurized gypsum. The preparation method is as follows: (1) drying process: drying the red mud, the acetylene sludge and desulfurized gypsum through a dryer, removing the free water; (2) weighing burdening and grinding mixing process: weighing burdening according to the raw material formulation, then putting the three raw materials in a ball mill to mix and grind until the specific surface area is not less than 600sq.m / kg; (3) low-temperature calcinating process: calcinating the mixer at a low temperature of 600 DEG C, keeping constant temperature for 1 hour, naturally cooling in atmosphere to obtain the early strength agent. The method disclosed by the invention has the advantages that the setting and hardening of the cement concrete are accelerated, the early strength is improved, the water-proof anti-permeability is good, various engineering demands are satisfied, the construction speed is accelerated, and the construction cost is reduced.

Description

technical field [0001] The invention relates to a method for manufacturing cement admixture, in particular to a method for preparing cement concrete early strength agent with industrial waste residue. Background technique [0002] Red mud is the solid waste discharged during the production of alumina. my country is a big producer of alumina. In 2009, it produced 23.78 million tons of alumina, accounting for about 30% of the world's total output, and produced nearly 30 million tons of red mud. At present, the comprehensive utilization rate of red mud in my country is only 4%, and the cumulative stockpiles have reached 200 million tons. A large amount of red mud is piled up, which not only occupies land, wastes resources, but also easily causes environmental pollution and potential safety hazards. [0003] The gelling activity of uncalcined red mud is low, and at an appropriate temperature, the clay components in red mud can be dehydrated and decomposed into amorphous silica...

AI Technical Summary

Problems solved by technology

However, due to the low content of calcium oxide in red mud, the degree of calcination to improve its activity is limited.