Dissolving-out process for large-sized pipeline remaining tank of diasporite bauxite ore

A bauxite and boehmite technology, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of increasing the processing capacity of a single equipment, difficult to clean the scarring of the heating pipe, unable to use hydraulic cleaning, etc. The effect of engineering investment and operating costs, large capacity for processing ore pulp, and long operating cycle

Inactive Publication Date: 2012-06-13
NORTHEASTERN UNIV ENG & RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009]2) There are many pressure vessels and large investment in the pressure cooking dissolution process
[0010]3) It is difficult to clean the scabs on the preheating autoclave and the heating tube of heating and autoclaving in the autoclave dissolution process, and simple water cleaning cannot be used
[0011]4) Pressure cooker equipment is especially limited by the difficulty of equipment manufacturing, and it is difficult to continue to increase the processing capacity of a single equipment

Method used

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  • Dissolving-out process for large-sized pipeline remaining tank of diasporite bauxite ore
  • Dissolving-out process for large-sized pipeline remaining tank of diasporite bauxite ore
  • Dissolving-out process for large-sized pipeline remaining tank of diasporite bauxite ore

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Experimental program
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Effect test

Embodiment 1

[0052] The processed raw material is gibbsite plus boehmite mixed type bauxite. The stripping process is carried out according to the following steps:

[0053] 1) Mix the pre-desiliconized desiliconized ore slurry with the circulating mother liquor at the outlet of the desiliconized discharge tank, and send the mixed slurry at 93°C to the primary pulse buffer through a diaphragm pump.

[0054] 2) After passing through the first-level pulse buffer, the slurry first enters the ninth-level secondary steam multi-inner tube casing preheater. Preheat to 205°C by secondary steam.

[0055] The inner and outer tubes of the nine-stage secondary steam multi-inner tube casing preheater receive secondary steam from the 1st to 9th flash evaporators, and the condensed water generated by heating enters the 1st to 9th secondary steam condensate tanks , all the secondary steam condensate tanks are connected in series as the pressure decreases, and the top of each secondary steam condensate ta...

Embodiment 2

[0065] The processed raw material is gibbsite plus boehmite mixed type bauxite. The stripping process is carried out according to the following steps:

[0066] 1) The pre-desiliconized desiliconized ore slurry is mixed with the circulating mother liquor at the outlet of the desiliconized discharge tank, and the mixed slurry at 95°C is sent to the first-stage pulse buffer through a diaphragm pump.

[0067] 2) After passing through the first-level pulse buffer, the slurry first enters the ninth-level secondary steam multi-inner tube casing preheater. Preheat to 210°C by secondary steam.

[0068] The inner and outer tubes of the nine-stage secondary steam multi-inner tube casing preheater receive secondary steam from the 1st to 9th flash evaporators, and the condensed water generated by heating enters the 1st to 9th secondary steam condensate tanks , all the secondary steam condensate tanks are connected in series as the pressure decreases, and the top of each secondary steam c...

Embodiment 3

[0078] The processed raw material is gibbsite plus boehmite mixed type bauxite. The stripping process is carried out according to the following steps:

[0079] 1) The pre-desiliconized desiliconized ore slurry is mixed with the circulating mother liquor at the outlet of the desiliconized discharge tank, and the mixed slurry at 90°C is sent to the first-stage pulse buffer through a diaphragm pump.

[0080] 2) After passing through the first-level pulse buffer, the slurry first enters the ninth-level secondary steam multi-inner tube casing preheater. Preheated to 200°C by secondary steam.

[0081] The inner and outer tubes of the nine-stage secondary steam multi-inner tube casing preheater receive secondary steam from the 1st to 9th flash evaporators, and the condensed water generated by heating enters the 1st to 9th secondary steam condensate tanks , all the secondary steam condensate tanks are connected in series as the pressure decreases, and the top of each secondary steam...

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Abstract

The invention provides a dissolving-out process for a large-sized pipeline remaining tank of diasporite bauxite ore. Processed raw materials include gibbsite and boehmite mixed bauxite ore or the diasporite bauxite ore. The dissolving-out process includes the following steps: pre-desiliconized ore pulp is mixed with circulating mother liquor at an outlet of a desiliconizing discharging groove, ispreheated by a sleeve preheater, is heated to the dissolving-out temperature by a sleeve heater, and then enters a heat-preservation remaining tank for remaining; finally, flash evaporation and separation are carried out on the ore pulp by a flash evaporator. The method in the invention realizes maximization of equipment, has strong capability of processing the ore pulp, and breaks through the capability limit of a pressing and stewing dissolving-out process to process the ore pulp; moreover, energy is saved, and the heat utilizing rate is high. The multi-inner-pipe sleeve preheater and the heater are adopted to preheat and heat the bauxite ore pulp; within the operating temperature range of the process, the heat transfer coefficient can be up to 900 to 1,200 Kcal / m2.h. DEG C. Compared with the traditional dissolving-out process, the dissolving-out process in the invention can save more than 30% of the energy in a comprehensive manner.

Description

Technical field [0001] The present invention is a technology field for alumina production technology, which involves the use of aluminum ore to prepare alumina for aluminum ore. Background technique [0002] At present, more than 95 % of the domestic alumina plants use the Bayerfa production process.The core of the Bayerfa production process is the dissolving process of aluminum ore ore ore. The purpose of dissolving is to react at a certain temperature at a certain temperature, generate sodium aluminum solution at a certain temperature, and the reaction formula is: [0003] AL 2 O 3 (1 or 3) H 2 O+2NA OH+AQ → 2NAAL (OH) 4 +AQ [0004] Due to the different chemical components of aluminum ore ore in various places, the dissolved temperature it needs is very different.The domestic ore is mainly a hard aluminum stone, and the dissolved temperature is about 255 to 270 ° C; the main foreign countries are three water aluminum stones, the dissolved temperature is about 140 to 160 ° C;So...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 许文强邢国春李保霖
Owner NORTHEASTERN UNIV ENG & RES INST CO LTD
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