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

A technology of bauxite and boehmite, applied in the direction of alumina/hydroxide, etc., can solve the problems of increasing project investment and operating costs, increasing the processing capacity of a single device, increasing investment and operating costs, and achieving The effect of increasing project investment and operating costs, large slurry processing capacity, and long operating cycle

Inactive Publication Date: 2010-07-07
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
Moreover, the pressure cooker must be equipped with stirring and other facilities, which increases a series of investment and operating costs
[0010] 3) It is difficult to clean the scabs on the preheating autoclave and the heating tube of heating and autoclaving in the dissolution process of

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

[0051] The processed raw material is gibbsite plus boehmite mixed type bauxite. The stripping process is carried out according to the following steps:

[0052] 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.

[0053] 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.

[0054] 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

[0064] The processed raw material is gibbsite plus boehmite mixed type bauxite. The stripping process is carried out according to the following steps:

[0065] 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.

[0066] 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.

[0067] 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

[0077] The processed raw material is gibbsite plus boehmite mixed type bauxite. The stripping process is carried out according to the following steps:

[0078] 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.

[0079] 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.

[0080] 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, is preheated 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 invention belongs to the technical field of alumina production technology, and in particular relates to the technology of using bauxite to prepare alumina. Background technique [0002] At present, more than 95% of alumina plants in China adopt the Bayer process. The core of the Bayer method production process is the dissolution process of bauxite slurry. The purpose of dissolution is to make bauxite and circulating mother liquor react at a certain temperature to generate sodium aluminate solution. The reaction formula is: [0003] al 2 o 3 .(1 or 3)H 2 O+2NaOH+aq→2NaAl(OH) 4 +aq [0004] Due to the different chemical composition of bauxite ores in various places, the required dissolution temperature varies greatly. Domestic ores are mainly diaspore type, with a dissolution temperature of about 255-270°C; foreign ores are mainly gibbsite, with a dissolution temperature of about 140-160°C; For boehmite, the dissolution temperature is about 24...

Claims

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Application Information

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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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