Method for stockpiling tailings from beneficiated bauxite

A bauxite and tailings technology, applied in bauxite washing, metal beneficiation tailings or non-metal beneficiation tailings storage, beneficiation tailings storage field, can only reach 25%- 30%, high operating cost, high paste concentration, to achieve the effect of easy implementation and low operating cost

Inactive Publication Date: 2010-05-05
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing bauxite tailings concentration equipment is mainly a thickener, because the particle size of the bauxite tailings is relatively fine, after being concentrated by the thickener, its weight concentration can only reach a maximum of 25%-30%, which is not enough for the preparation of paste. Requirements for concentration of tailings slurry at solid time
[0007] (2) The mixing effect of paste preparation is not good
Because the bauxite tailings, base material, and gelation activator in the composition of the paste are all fine in size, for example, -0.074mm in the tailings accounts for about 90%, and -0.074mm in the base material accounts for about 57%. -0.074mm in the agent accounts for about 90%. Therefore, when several materials are mixed and stirred, the fine particles in the mixture interact with water to produce agglomeration and form agglomerates, resulting in poor mixing effect and uneven paste preparation, which directly affects the Paste quality and coagulation accumulation effect
[0009] (3) The continuity of paste pumping is not strong
[0010] Due to the high concentration, high viscosity, poor fluidity and certain cementation of the paste, when it is transported to the storage yard for a long distance, the delivery pump is easy to block, the pipeline pressure loss is large, the operating cost is high, and failures often occur. Affect the storage effect of bauxite tailings
[0011] These problems have seriously affected the implementation effect of the industrialization of safe storage of bauxite tailings

Method used

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  • Method for stockpiling tailings from beneficiated bauxite
  • Method for stockpiling tailings from beneficiated bauxite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] After the bauxite tailings slurry is concentrated to a solid weight concentration of 40% by using a two-stage concentration process of a thickener and a deep cone high-efficiency settling tank, base material powder with pozzolanic activity or potential hydraulicity is added Coal ash, granulated blast furnace cinder, coal gangue, red mud, silica fume, volcanic ash, pumice, any one and / or mixture of several kinds, the addition amount is 10% of the weight of dry tailings; gelling activator cement, lime , gypsum, water glass and / or several mixtures, the addition amount is 1% of the weight of the dry tailings, and the two-stage agitation of the combination of the twin-shaft blade mixer and the double-screw agitation conveyor is used to prepare the mixture. The uniform paste with a solid weight concentration of 40% 0% and a slump of 20 cm cm is transported to the storage yard by the paste, and is condensed to form a hardened accumulation body for stacking.

Embodiment 2

[0036] After the bauxite tailings slurry is concentrated to a solid weight concentration of 55% by using a two-stage concentration process of a thickener and a deep cone high-efficiency settling tank, base material powder with pozzolanic activity or potential hydraulicity is added Coal ash, granulated blast furnace cinder, coal gangue, red mud, silica fume, volcanic ash, pumice, any one and / or mixture of several kinds, the addition amount is 50% of the weight of dry tailings; gelling activator cement, lime , gypsum, water glass, any one and / or a mixture of several kinds, the addition amount is 10% of the weight of dry tailings, and it is prepared by two-stage stirring with a combination of a twin-shaft blade mixer and a double-screw mixing conveyor. A uniform paste with a solid weight concentration of 60% and a slump of 28 cm is produced, and the paste is transported to the stockyard for condensation to form a hardened accumulation body for stacking.

Embodiment 3

[0038] The bauxite tailings slurry with a weight concentration of 12% is concentrated by a thickener to a weight concentration of 25%, and then concentrated through a deep cone high-efficiency settling tank to obtain a high-concentration bauxite tailings slurry with a weight concentration of 45%. The high-concentration bauxite tailings slurry, fly ash and cement from the silo are sent to the double-shaft blade mixer for primary mixing, and then enter the double-screw mixing conveyor for secondary strong mixing to prepare the weight concentration 51%, a uniform paste with a slump of 23cm. The amount of fly ash added is 35% of the weight of the dry tailings, and the amount of cement added is 2% of the weight of the dry tailings. The paste is sent into the paste storage tank, and the paste is pressed into the pipeline by the full hydraulic double-cylinder piston pump to be transported to the storage yard. The paste is piled up in four areas in the stockyard, and condenses to for...

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Abstract

The invention relates to a method for stockpiling tailings from beneficiated bauxite, belonging to the method for stockpiling tailings from washed bauxite or beneficiated bauxite or the method for stockpiling tailings from beneficiated metal or beneficiated nonmetal. The method for stockpiling tailings from the beneficiated bauxite is characterized in that after the pulp of the tailings from the beneficiated bauxite is concentrated until the weight concentration of the solid reach 40-55 percent in the process of stockpiling the tailings from the beneficiated bauxite, base stock and gelatinous activator which have the pozzolanic activity or the latent hydraulicity are added to the pulp of the tailings from the beneficiated bauxite, then mixed with the same, and strongly stirred to the same to prepare the uniform paste with the weight concentration of the solid being 40-60 percent and the collapse degree being 20-28 cm, and the paste is transported to a stockpiling yard to be coagulated into a harden stockpiled body. The practice proves that the method for stockpiling tailings from the beneficiated bauxite is easy to realize the large-scale industrial production and has low operating cost.

Description

technical field [0001] A storage method for bauxite dressing tailings relates to a storage method for bauxite washing ore dressing tailings, or other metal dressing tailings or non-metallic dressing tailings. technical background [0002] Bauxite tailings is a kind of waste produced in the process of alumina production. Because it contains a large amount of clay minerals such as kaolinite and illite, and the particle size is extremely fine, the settlement and compression properties of bauxite tailings are very poor. , solidification is very slow, unable to form a stable hardened accumulation. If the conventional wet dam storage method is adopted, it will not only lead to large tailings storage volume and high maintenance costs, but also seriously affect the environment, personal and property safety of residents around the tailings pond. [0003] At present, a patent for the stacking method of bauxite dressing tailings has been published (application number 200610109277.3), ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B1/00
Inventor 赵东峰王永红刘伟王二星刘焦萍黄春成李太昌李国兵
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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