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Grind grading technique for aluminum oxide raw material - monohydrallite

A process technology, bauxite technology, which is applied in the field of refining process of alumina raw material bauxite, can solve the problems of difficult management and operation, many equipments, complicated process flow, etc., and achieve simplified grinding process, Effect of reducing power consumption and improving equipment operation rate

Inactive Publication Date: 2006-02-08
GUIYANG AL-MG DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

But its disadvantage is that the technological process is more complicated, more equipment is used, and the management and operation are more difficult than the first stage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: Add bauxite and lime in proportion to the double-chamber overflow type ball mill through the grinding head bin and feeder, and add a small amount of circulating mother liquor in the mill. According to the different characteristics of bauxite, The dosage of lime is usually between 5% and 23% of the weight of bauxite, and the dosage of circulating mother liquor is in the range of 0.8 to 1.1 based on the grinding liquid-solid ratio L / S. After the bauxite is coarsely ground in the first warehouse, it enters the second warehouse for fine grinding. The finely ground slurry enters the hydrocyclone for classification, and the bottom flow of the classification is coarse sand and returns to the mill. The pulp is pumped into the raw pulp tank. The main technical parameters in the process are as follows:

[0018] — Grinding liquid-solid ratio: L / S 0.8~1.1;

[0019] — Grinding temperature: 70-90°C;

[0020] —The amount of sand returned by the mill: 150% to 250%;

...

Embodiment 2

[0027] Embodiment 2: A grinding device for producing alumina by using bauxite. According to the characteristics of the ore, no lime is added in the grinding process, or only 1% to 4% of the weight of the bauxite is added. The technical indicators are as follows :

[0028] — Grinding liquid-solid ratio: L / S 0.8~1.1;

[0029] — Grinding temperature: 70-90°C;

[0030] —The amount of sand returned by the mill: 200% to 250%;

[0031] - Bauxite feed grain size: 12 ~ 40mm;

[0032] - Raw pulp product fineness: 100%<48 mesh, 95%<65 mesh, 42%~50%<325 mesh;

[0033] —Classification pressure of hydrocyclone: ​​0.08~0.15MPa;

[0034] - Solid content of hydrocyclone feed: 300-450g / L;

[0035] —Solid content of hydrocyclone overflow: 280~380g / L;

[0036] —Solid content in the bottom fluid of hydrocyclone: ​​900~1200g / L.

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Abstract

The invention relates to a grading process technology containing two procedures of grinding ore and grading in processing monohydrallite. Grinding equipment adopts two-bin overflow ball mill and grading equipment adopts hydraulic cyclone group, which cooperate with each other to form closed-circuit grading flow process. Two-bin overflow ball mill equips compartment board that can be adjusted to separate mill into two bins. The invention simplifies procedure and makes the operation convenient.

Description

technical field [0001] The present invention relates to the production of alumina, in particular to the refining process of bauxite, the raw material for alumina. Background technique [0002] The raw ore pulp preparation is an important production process in the raw material workshop of the alumina plant. Its function is to grind the bauxite and lime to a qualified fineness, and add the circulating mother liquor to prepare a qualified raw ore slurry for use in the subsequent dissolution workshop. The qualification rate index of raw ore pulp directly affects the technical index of the dissolution process and the technical and economic index of the whole plant. After searching, there are only a small number of patent applications related to the bauxite refining process, such as No. 02125586.5 "Method for Adding Lime in Alumina Production Process" and so on. [0003] At present, there are two main raw ore pulp preparation processes used in alumina plants: [0004] (1) One-st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C17/00B02C23/08B02C17/06B02C17/22
Inventor 陈德马尚成
Owner GUIYANG AL-MG DESIGN & RES INST
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