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A method for simultaneously preparing nano-calcium carbonate and chlorine-free calcium silicate early-strength agent with marble polishing slag

A nano-calcium carbonate, polishing waste residue technology, applied in chemical instruments and methods, calcium carbonate/strontium/barium, nanotechnology for materials and surface science, etc., can solve the adverse effects of human living environment, waste of recyclable resources, Occupying land resources and other issues, to achieve the effect of easy control of the reaction process, cost saving and simple operation

Active Publication Date: 2022-04-29
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Landfill and incineration are the common ways to deal with marble waste residue. Landfill not only occupies land resources and crowds out cultivated land, but also hardens the land; incineration is not only a waste of recyclable resources, but also produces environmental pollution and harms human beings. adverse impact on the living environment

Method used

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  • A method for simultaneously preparing nano-calcium carbonate and chlorine-free calcium silicate early-strength agent with marble polishing slag
  • A method for simultaneously preparing nano-calcium carbonate and chlorine-free calcium silicate early-strength agent with marble polishing slag
  • A method for simultaneously preparing nano-calcium carbonate and chlorine-free calcium silicate early-strength agent with marble polishing slag

Examples

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Effect test

Embodiment 1

[0037] Example 1: see attached figure 1 .

[0038] A method for preparing nano-calcium carbonate and chlorine-free calcium silicate early strength agent simultaneously from marble polishing waste residue, the method comprises the following steps:

[0039] a. Preparation of nano calcium carbonate;

[0040] Take the marble polishing waste (particle size is D 50 = 5.4 μm) as a solid raw material, a concentration of 1.0 mol / L dilute nitric acid aqueous solution as a liquid raw material, according to the solid-liquid ratio of solid raw material: liquid raw material is 1:10 The solid raw material and the liquid raw material are mixed in the reactor, at 50 ° C After stirring the reaction time at the temperature for 3 hours, filter the reacted material (for solid-liquid separation), and then wash the solid obtained after filtration with water 4 times and dry (the solid is placed in an oven with a temperature of 50 ° C for 5 hours) , namely make nano-calcium carbonate (or be called ...

Embodiment 2

[0054] A method for preparing nano-calcium carbonate and chlorine-free calcium silicate early strength agent simultaneously from marble polishing waste residue, the concentration of the nitric acid aqueous solution reacted with marble polishing waste residue is 1.2mol / L, and the others are the same as in Example 1, and are omitted.

Embodiment 3

[0056] A method for simultaneously preparing nano-calcium carbonate and chlorine-free calcium silicate early strength agent from marble polishing waste residue. The temperature when the marble polishing waste residue reacts with the aqueous nitric acid solution is 60° C., and the rest are the same as in Example 1, and are omitted.

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Abstract

The invention discloses a method for simultaneously preparing nano-calcium carbonate and chlorine-free calcium silicate early-strength agent by using marble polishing waste slag. Mix the raw materials at a solid-to-liquid ratio of ~10, stir and react at 20-60°C for 1-3 hours, then filter, and wash and dry the solid to obtain nano-calcium carbonate; the liquid is used as a calcium source; 0.5-1.0 mol / L Na 2 SiO 3 The aqueous solution is the silicon source; according to the ratio of the amount of calcium: silicon substance is 0.6 ~ 2.0: 1, take the calcium source and the silicon source, mix them under stirring, add 0.1 ~ 2% sodium dodecylbenzene sulfonate, at 25 ~ Stir and react at 85°C for 3 to 5 hours to obtain the chlorine-free calcium silicate accelerator. By adopting the invention, a new approach is provided for the utilization of marble polishing slag, energy saving and environmental protection, the performance of the chlorine-free calcium silicate early strength agent is good, and the practicability is strong.

Description

technical field [0001] The invention belongs to the treatment of waste residue and the preparation of nano-particles and building materials, and relates to a method for simultaneously preparing nano-calcium carbonate and chlorine-free calcium silicate early strength agent by using marble polishing waste residue. As an inorganic functional filler with excellent performance, the nano calcium carbonate prepared by the invention can be used in the rubber industry to improve the reinforcement performance, tensile performance and anti-aging performance of the material; when used in plastics, it can solve the problem of uneven shrinkage and The problem of uneven mixing; the filler used for coating and processing paper can effectively improve the smoothness and softness of the paper; the main purpose of the chlorine-free calcium silicate early strength agent prepared by the present invention is to be used as a concrete early strength agent . Background technique [0002] At present...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18C01B33/24B82Y30/00B82Y40/00
CPCC01F11/185C01B33/24B82Y30/00B82Y40/00C01P2004/62C01P2004/04C01P2002/72C01P2004/64
Inventor 杨红严云胡志华
Owner SOUTHWEAT UNIV OF SCI & TECH
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