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Method for leaching bauxite ore pulp

A technology of bauxite and ore slurry, applied in the direction of alumina/hydroxide, etc., can solve problems such as heating pipe scarring

Inactive Publication Date: 2011-04-13
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] At present, the existing pipeline dissolution process adopts the pre-desilication of the pulp at a temperature of about 95°C when processing the concentrate. Heat preservation and dissolution in series dissolution residence tanks, scarring will also occur in the heating pipeline

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] According to a certain amount of ingredients, add flotation concentrate, lime milk and circulating mother liquor to prepare the required qualified raw ore slurry. After pre-desiliconization in the pre-desilication tank at 110°C for 8 hours, pump it into the slurry preheating pipeline. When preheating to 170-180°C, introduce the pulp into the residence reaction tank for 30 minutes, then pump the pulp into the preheating pipeline and continue heating to 220-230°C, then send it into the reaction residence tank for 30 minutes, and the reacted The slurry enters the preheating pipeline and is heated to the dissolution temperature by molten salt, and is kept in the dissolution retention tank for a corresponding reaction time to complete the dissolution process of the concentrate. As a result of the implementation, the scar cleaning cycle of the Bayer process slurry preheating system has been increased from about one week to 30 days.

Embodiment 2

[0027] According to a certain amount of ingredients, add flotation concentrate, lime milk and circulating mother liquor to prepare the required qualified raw ore slurry. After pre-desiliconization in the pre-desilication tank at 95°C for 16 hours, pump it into the slurry preheating pipeline. When preheating to 170-180°C, introduce the pulp into the residence reaction tank for 20 minutes, then pump the pulp into the preheating pipeline and continue heating to 220-230°C, then send it into the reaction residence tank for 30 minutes, and the reacted The slurry enters the preheating pipeline and is heated to the dissolution temperature by molten salt, and is kept in the dissolution retention tank for a corresponding reaction time to complete the dissolution process of the concentrate. As a result of the implementation, the scar cleaning cycle of the Bayer process slurry preheating system has been increased from about one week to 28 days.

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Abstract

The invention relates to a method for leaching bauxite ore pulp, in particular to a method for leaching bauxite ore pulp during aluminium oxide production by a Bayer process. The method is characterized in that (1) the bauxite ore pulp is subject to intensifying pre-desilication; and (2) the ore pulp after intensifying pre-desilication is preheated in a first preheating pipeline, then the ore pulp is introduced into a heat preservation reactor to react and then is pumped into a second preheating pipeline to be heated, and then the ore pulp is introduced into the heat preservation reactor to react and then is introduced into a heating pipeline to be heated to leaching temperature, thus completing the leaching process. In the method provided by the invention, the high temperature intensifying pre-desilication process with longer reaction time is adopted, thus the pre-desilication efficiency of the ore pulp is improved; and meanwhile retention reactors are arranged in the pipeline preheating process of the ore pulp after pre-desilication by sections, so that mineral containing silicon and mineral containing titanium fully react in the retention reactors and the probability of precipitation from follow-up heat exchange surface is reduced, thus slowing down scabbing in the preheating process of the ore pulp.

Description

technical field [0001] The invention relates to a bauxite ore slurry dissolution method, which relates to a bauxite ore slurry dissolution method in the process of producing alumina by the Bayer method. Background technique [0002] The dissolution of bauxite is a key process in the production of alumina by the Bayer process. The purpose of dissolution is to select the appropriate dissolution conditions according to the characteristics of bauxite resources so that the Al in the ore 2 o 3 Enter as much sodium aluminate solution as possible to achieve separation from other impurity minerals, and at the same time obtain a certain caustic ratio eluate and red mud with good settling performance, creating good operating conditions for subsequent processes. [0003] In the dissolution process of Bayer process, the preheating method of indirect heating for bauxite slurry is the main measure of energy saving in Bayer process production. The scarring problem of the pulp during the p...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 杨巧芳尹中林杨桂丽李晓萍
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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