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A method for preparing Portland cement clinker from ore flotation tailings

A technology of portland cement and tailings, which is applied in cement production and other fields, and can solve the problems of complex components of magnetic separation tailings

Active Publication Date: 2020-10-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The beneficiation method of manganese carbonate ore in Huayuan County and surrounding counties and cities is mainly magnetic separation, but the composition of the magnetic separation tailings is complex, and the content of quartz varies with the beneficiation efficiency, while the manganese carbonate flotation tailings The application of research has never been reported, and it is still in a blank stage.

Method used

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  • A method for preparing Portland cement clinker from ore flotation tailings
  • A method for preparing Portland cement clinker from ore flotation tailings
  • A method for preparing Portland cement clinker from ore flotation tailings

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Experimental program
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Effect test

Embodiment approach

[0080] According to a preferred embodiment of the present invention, the content of Cd, Cr, and As in the cement clinker is at the ppm level, heavy metal elements such as Mn, Zn, and Pb are insoluble, and can be stably solidified in the mineral phase of the cement clinker, and radioactive exposure The ratio meets the specified standards, and the strength of the cement prepared by it also meets the relevant cement strength standards.

[0081] The beneficial effects that the present invention has:

[0082](1) The method for preparing Portland cement clinker provided by the invention is simple and easy, and has high practical value;

[0083] (2) The raw material used in the present invention is ore flotation tailings, which finds a new approach for the treatment of flotation tailings, which not only helps environmental protection, but also builds a circular economy in related industries;

[0084] (3) cement clinker prepared by the present invention, the cement compressive streng...

Embodiment 1

[0090] Manganese ore flotation tailings, lead-zinc ore flotation tailings, aluminum hydroxide and silicon dioxide were prepared as raw meal in proportions of 15.1%, 80.4%, 1.9% and 2.6% respectively;

[0091] Then put the prepared raw meal in a planetary ball mill to grind for 4 hours, pass the ground raw meal through a 200-mesh sieve, and mold it in a 50T four-column press to form a cube of 13×13×13mm;

[0092] Put the molded raw meal in a high-temperature furnace for calcination. The calcination atmosphere is an oxidative atmosphere. First, it is raised from room temperature to the calcination starting temperature of 900°C and kept for 60 minutes. ;

[0093] After the heat preservation at the end point temperature, it is cooled to 1300°C with the furnace and then taken out for rapid cooling to obtain the product. Its XRD characterization results are as follows figure 1 shown.

Embodiment 2

[0095] The preparation process of Example 1 was repeated, except that the holding time at the calcination end temperature of 1450° C. was 0 min. Its XRD characterization results are as follows figure 1 shown.

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Abstract

The invention provides a method for preparing Portland cement clinker from ore flotation tailings. The method comprises the following steps: firstly mixing the ore flotation tailings with other ingredients to form raw meal, then performing grinding, sieving, mould pressing and calcining on the raw meal, and finally performing cooling to obtain the cement clinker. The compressive and flexural strength of cement prepared by the Portland cement clinker prepared by the method can meet relevant cement strength requirements. The provided method for preparing the Portland cement clinker is simple andeasy to implement, and low in cost. A new method for rational utilization of the ore flotation tailings is broadened, the circular economy in related industries is constructed, and a new idea for cement clinker preparation is broadened.

Description

technical field [0001] The invention relates to a method for preparing cement clinker, in particular to a method for preparing portland cement clinker with ore flotation tailings. Background technique [0002] Lead-zinc tailings are produced in the process of lead-zinc flotation. It is a solid mineral waste formed by natural dehydration of the tailings slurry discharged from the concentrator. Its main components vary greatly depending on the natural mineralization conditions. The ore system mainly contains silicate and carbonate, and the oxidized ore system contains limestone, in addition to various heavy metal elements. The lead-zinc mines in Huayuan County and surrounding counties and cities are mainly limestone and a small amount of lead-zinc sulfide ore, while manganese carbonate ore mainly contains quartz, carbonate, and a small amount of pyrite, alumina and feldspar. A large number of tailings are mainly piled in tailings storage or some natural places, which inevitab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/24C04B7/38
CPCC04B7/24C04B7/38Y02P40/10
Inventor 常兴华金胜明崔葵馨
Owner CENT SOUTH UNIV
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