CN100534935C

CN100534935C - Sub-dam construction method of Bayer process red-mud dry-stacking field

Info

Publication number: CN100534935C
Application number: CNB2006102004638A
Authority: CN
Inventors: 李明阳
Original assignee: Guiyang Aluminum Magnesium Design and Research Institute Co Ltd
Current assignee: Guiyang Aluminum Magnesium Design and Research Institute Co Ltd
Priority date: 2006-05-18
Filing date: 2006-05-18
Publication date: 2009-09-02
Anticipated expiration: 2026-05-18
Also published as: CN1850666A

Abstract

The invention discloses a subdam constructing method using Bayer red mud dry storage ground, constructing a subdam on the red mud on inner edges of an initial-stage dam staked with red mud, and comprising the steps of: batching, subdam foundation firming, subdam body rolling moudling, and subdam body finishing. And it is aimed at the red mud dry storing mode in the Bayer production, able to meet mechanical strength for stabilizing the red mud storage ground in the dry storing mode, and able to obtain larger storage capacity in a limited storage ground area.

Description

A kind of sub-dam construction method of Bayer process red-mud dry-stacking field

Technical field

The present invention relates to the sub-dam construction method of a kind of sub-dam construction method of dry-method red mud storage yard, particularly a kind of Bayer process red-mud dry-stacking field.

Background technology

In the alumina producing, adopt different production technique with the difference of raw material.What generally adopt at present is the alkaline process production technique, in the alkaline process production technique, specifically also can be divided into Bayer process, sintering process and integrated process.The waste residue that produces in the alumina producing is red mud, need be sent to special red mud dump and store up.Red mud dump is by the acquisition storage capacity of building a dam, and initial dam is constructed with materials such as native stones by general elder generation, constructs sub-dam with red mud again after initial dam piles with and increases step by step, so that obtain bigger storage capacity on limited storage space.

The material of sintering process and integrated process red mud contains β-2CaOSiO2 (Dicalcium Phosphate (Feed Grade)) more than 50% in forming, and has the hydraulic gelling under the certain condition, and its mechanical index is near cement of low index.At present, sintering process and integrated process red mud all adopt wet method to store up mode, and initial dam piles with increasing of stockyard, back and adopts hydraulic fill method to form sub-dam, promptly increases nature in time and form firm sub-dam in discharge, the height of dam on every grade of sub-dam mostly surpasses 6m, and the gradient is more than 45 ° outside the sub-dam.

In the red mud with the generation of Bayer process production technique, CaO and SiO ₂Chemical Composition content low, about 20% and 7%, compare with the integrated process red mud respectively with sintering process, mechanical index is much lower.For guaranteeing the stability of stack, the suitable dry method that adopts of Bayer process red mud is stored up mode, the red mud that the stockyard is delivered in i.e. control is starched its water ratio and (is being equivalent to the water content 89% on the soil mechanics meaning) below 47%, and carry out natural drying in the stockyard, a series of operations such as mechanical assistance teds.

The Bayer process red mud stockyard will continue upwards to store up after the dam piles with in the early stage, just must construct Zi Ba again.Because Bayer process red mud exists than big-difference with sintering process and integrated process red mud on mechanical property, therefore, the domestic sintering process that generally adopts and the rule of thumb data of integrated process red mud dump all can not be applied mechanically in aspects such as the mode of building a dam, height of dam, the dam slope on sub-dam compares, and the sub-dam construction method of existing red mud dump all not too adapts to the sub-dam construction of Bayer process red-mud dry-stacking field.

Summary of the invention

The objective of the invention is to: a kind of sub-dam construction method with the dry-method red mud storage yard that discharges in the alumina producing Bayer process process is provided, so that the Bayer process red mud stockyard can be implemented on the red mud dam foundation after the dam piles with in the early stage and construct Zi Ba with dried red mud as dam material, realize the lasting stacking in stockyard.

The present invention constitutes like this: a kind of sub-dam construction method of Bayer process red-mud dry-stacking field, on the red mud on sub-dam construction edge in the initial dam that piles with red mud, the construction method on sub-dam 1 is finished by following step: get the raw materials ready, reinforce the dam foundation, roller-compaction dam body, dam body finishing.

The sub-dam construction method of above-mentioned Bayer process red-mud dry-stacking field, in material preparation step, select for use the red mud of water content 25%～35% to make dam material, dam material is deposited near the sub-dam dam site, and at the wet red mud slurry of the red mud surface discharge of water content 25%～35% with its surface coverage, stand-by.

The sub-dam construction method of aforesaid Bayer process red-mud dry-stacking field, in reinforcing dam foundation step, with dozer the red mud layer that is in the dam foundation 2 scopes is carried out broken shell and preliminary rolling operation earlier, further roll with vibrating roller again, until reaching 35% when following in the dam foundation scope 3m degree of depth with interior red mud water content, finish stabilization of dam foundation through sampling Detection.

The sub-dam construction method of aforesaid Bayer process red-mud dry-stacking field, in roller-compaction dam body step, transport to the Zi Ba position with choosing stand-by material, and carry out fragmentation, shakeout, the vibroroller cmpacting operation is carried out in layering then, and every layer is rolled gauge control at 300～400mm, water content 20%～23% that is compacted to every layer of red mud o'clock is qualified, width by lower floor to upper strata successively successively decreases, but should be than the wide 0.5～2m in dam body both sides after finishing, and the height until sub-dam reaches 5.5～6.5M.

The sub-dam construction method of aforesaid Bayer process red-mud dry-stacking field, in the dam body pre-shaping step, after sub-dam rolls and finishes dam body being carried out deburring handles, medial and lateral respectively trim redundance 3, outside the sub-dam, inner slope all is trimmed to 1: 2～1: 2.5 the gradient, width at dam crest 4.5～the 6M on sub-dam, the sub-dam after the finishing should symmetry along dam axis direction two sides.

Compared with prior art, The present invention be directed to the dry-method red mud that produces in the Bayer process production and store up mode, and the sub-dam construction method of invention can satisfy dry method and store up the stockyard of mode and stablize needed mechanical strength, can obtain bigger storage capacity on limited storage space.

Description of drawings

Accompanying drawing 1 is that sub-dam of the present invention forms synoptic diagram.

Embodiment

Embodiments of the invention: as shown in Figure 1; at first; prepare dam material; with tedded in the red mud layer of stockyard, water content reaches 25%～35% red mud and elects; stack near being transported to sub-dam to be constructed with machineries such as dozer, excavators; and take measures (as at a small amount of red mud of surface discharge slurry) protected, to keep its water content.

Secondly, the dam foundation on antithetical phrase dam is reinforced, and sub-dam 1 is seated on the red mud layer, with the red mud layer as sub-dam foundation plinth.With dozer the red mud layer that is in the dam foundation 2 scopes is carried out broken shell and preliminary rolling operation earlier, further roll with vibrating roller again, reach 35% when following until the 3m degree of depth in sampling Detection dam foundation scope with interior red mud water content, finish stabilization of dam foundation.

Then, the operation of on the dam foundation after the reinforcing, building a dam, good red mud as dam material will be stacked, transport to the Zi Ba position with machineries such as dozer, excavators, and carry out fragmentation, shakeout, layering is carried out rolling operation with vibrating roller then, and every layer is rolled thickness 300mm, is qualified when being compacted to sub-dam dam body red mud water content 20%.Every layer width progressively successively decreases, and rolls width and should many 2m (inboard, the outside respectively have more 1m) than the required width of dam body, with the compacting intensity of the dam body that guarantees whole sub-dam and the job safety of street roller.When reaching 6m, finishes group height of dam degree dam compacting operation.

At last, dam body is carried out deburring handle, medial and lateral respectively trim redundance 3, and sub-dam Wai Po, inner slope all are trimmed to 1: 2 the gradient, and the top width on sub-dam is 5m, guarantee mechanical current the needs.The finishing back is same numerical value along the wide and inside and outside dam slope of the dam crest of each section of dam axis direction.

Through above step, finish constructing of the high sub-dam of 6m, can carry out the blowing operation on the sub-dam and come into operation.The dam foundation red mud water content on sub-dam detects every the 30m sampling, and the dam body red mud water content on sub-dam detects every the 15m sampling.Lower floor's red mud detects and can spread out cloth after qualified, rolls the last layer red mud during rolling operation.The gradient of sub-dam outer slope should be appraised and decided according to the stack stability Calculation.

Claims

1. the sub-dam construction method of a Bayer process red-mud dry-stacking field, it is characterized in that: sub-dam (1) is constructed on the red mud on edge in the initial dam that piles with red mud, and the construction method of sub-dam (1) is finished by following step: get the raw materials ready, reinforce the dam foundation, roller-compaction dam body, dam body finishing; In material preparation step, select for use the red mud of water content 25%～35% to make dam material, dam material is deposited near the sub-dam dam site, and at the wet red mud slurry of the red mud surface discharge of water content 25%～35% with its surface coverage, stand-by; In reinforcing dam foundation step, with dozer the red mud layer that is in the dam foundation (2) scope is carried out broken shell and preliminary rolling operation earlier, further roll with vibrating roller again, until reaching 35% when following in the dam foundation scope 3m degree of depth with interior red mud water content, finish stabilization of dam foundation through sampling Detection.

2. the sub-dam construction method of Bayer process red-mud dry-stacking field according to claim 1, it is characterized in that: in roller-compaction dam body step, transport to the Zi Ba position with choosing stand-by material, and carry out fragmentation, shakeout, the vibroroller cmpacting operation is carried out in layering then, every layer is rolled gauge control at 300～400mm, water content 20%～23% that is compacted to every layer of red mud o'clock is qualified, width by lower floor to upper strata successively successively decreases, but should be than the wide 0.5～2m in dam body both sides after finishing, the height until sub-dam reaches 5.5～6.5M.

3. the sub-dam construction method of Bayer process red-mud dry-stacking field according to claim 1, it is characterized in that: in the dam body pre-shaping step, after sub-dam rolls and finishes dam body being carried out deburring handles, medial and lateral respectively trim redundance (3), outside the sub-dam, inner slope all is trimmed to 1: 2～1: 2.5 the gradient, width at dam crest 4.5～the 6M on sub-dam, the sub-dam after the finishing should symmetry along dam axis direction two sides.