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A method for preparing acid-resistant ore aggregates by geopolymerization

A geopolymerization and agglomerate technology, applied in cement production and other directions, can solve the problems of difficulty in forming stable, permeable, acid-resistant agglomerates, lack of acid-resistant gelling agents, etc. simple effect

Inactive Publication Date: 2021-07-27
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, due to the lack of acid-resistant gelling agents, it is difficult to prepare acid-resistant aggregates
This limits the application of ore aggregates in acidic environments, such as ore heap leaching in acidic environments, it is difficult to form a stable and permeable ore heap

Method used

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  • A method for preparing acid-resistant ore aggregates by geopolymerization
  • A method for preparing acid-resistant ore aggregates by geopolymerization
  • A method for preparing acid-resistant ore aggregates by geopolymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Use 300g of coarse and fine mixed ore with high fine-grained content (ore with a content of less than 200 mesh and more than 5%) as the raw ore, mix well with 9g of metakaolin, and pour it into a straight plastic bottle made of high-density polyethylene. in the drum. 11.25g Na 2 SiO 3 Dissolve 3.75g NaOH in 30mL water to form an alkali activator solution, and spray the alkali activator solution evenly into the ore. After the drum was rotated for 3 minutes, the formed aggregate was poured out, and solidified at a temperature below 30° C. for 3 days to obtain the final aggregate. From figure 2 It can be seen that the particle size of ore aggregates is obviously larger than that of raw ore; image 3 It can be seen that the content of -200 mesh in the raw ore is greater than 10%, and the content of -1.6mm is greater than 50%, which belongs to the ore with high fine-grained content. After forming aggregates, d 10 From 0.07mm to 9.52mm, d 50 From 1.52mm to 16.61mm, th...

Embodiment 2

[0030] Take 300g of fine-grained (less than 200 mesh) ore as the raw ore, mix it well with 12g of metakaolin, and pour it into a drum made of plastic straight cylinder bottles made of high-density polyethylene. 12g Na 2 SiO 3 Dissolve 3g NaOH in 75mL water to form an alkali activator solution, and spray the alkali activator solution evenly into the ore. After the drum was rotated for 3 minutes, the formed agglomerates were poured out, and solidified at a temperature below 30° C. for 5 days to obtain the final agglomerates.

Embodiment 3

[0032] Take 6 parts of 300g coarse-fine mixed ore with high fine-grained content (ore with a content of less than 200 mesh and more than 5%) as the raw ore, mix well with 0, 3, 6, 9, 12, 15g of metakaolin, and then Pour into a drum made of plastic straight bottle made of high-density polyethylene. 12g Na 2 SiO 3 Dissolve 3g NaOH in 27mL water to form an alkali activator solution, and spray the alkali activator solution evenly into the ore. After the drum was rotated for 3 minutes, the formed aggregate was poured out, and solidified at a temperature below 30° C. for 3 days to obtain the final aggregate. See Figure 4 . When no metakaolin was added, the acid resistance of the ore aggregates was poor, and the mobility of the fine particle size was higher than 45%; when 1wt.% of metakaolin was added, the acid resistance of the ore aggregates was significantly improved, and the mobility of the fine particle size dropped to 12.46 %; when adding 2wt.% metakaolin, the particle si...

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Abstract

The invention discloses a method for preparing acid-resistant ore aggregates by means of geopolymerization. The present invention uses fine-grained ore or coarse-grained ore with high fine-grained content as raw materials, wherein the fine-grained ore is less than -200 mesh, and the content of coarse-fine mixed ore -200 mesh is greater than 5%. After the raw materials are fully mixed with metakaolin, a certain proportion of alkali activator solution is added, and aggregates are formed by drums. Then it is cured for a certain period of time at normal temperature or relatively high temperature to prepare aggregates. The particle size of the ore agglomerate of the invention is much larger than that of the raw material and has strong acid resistance, which is beneficial to the osmosis and leaching of the ore agglomerate under acidic conditions. The present invention uses geopolymerization reaction to agglomerate ore for the first time, so that part of the ore that is difficult to use due to high fine-grained content is fully utilized. The source of alkali activator and kaolin is abundant and the dosage is small, which makes the cost low and the process flow is simple and efficient. It is economical and practical, and has good industrial prospects and social benefits.

Description

technical field [0001] The invention belongs to the field of ore aggregate preparation, and in particular relates to a method for preparing an acid-resistant ore aggregate by geological polymerization. Background technique [0002] my country is rich in mineral resources, and the mineral processing industry is developing rapidly. In some cases, the ore contains a higher fines fraction, or a higher fraction of the fines fraction after crushing. A high content of fine-grained ore is unfavorable in some cases. For example, a high content of fine-grained ore in heap leaching will affect the permeability of the ore heap, making the leaching process impossible. Therefore, the preparation of ore aggregates with good properties has certain significance for the further processing of ore. In the existing technology of preparing ore aggregates. It is mainly to mix liquid and gelling agent with ore, or only add liquid, and prepare ore agglomerates in drum, belt, disc granulator and o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00
CPCC04B28/006C04B18/021C04B2111/23Y02P40/10C04B14/106C04B14/30
Inventor 印万忠陈克强饶峰刘金艳马英强
Owner FUZHOU UNIV