Tube array and remaining tank dissolving-out system and method for gibbsite bauxite

A gibbsite-type and bauxite technology, applied in the direction of alumina/hydroxide, etc., can solve problems such as unreasonable economics, high equipment manufacturing costs, and large system resistance loss, so as to reduce the difficulty of production operations and maintenance difficulty, reduced operating costs, and long operating cycles

Inactive Publication Date: 2011-11-23
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]1. Theory and production practice have proved that the mother liquor and the desiliconized slurry are mixed first and then preheated and heated by multi-inner tube casings. Due to the limitation of pipeline manufacturing, the largest outer pipe can only be DN=600, which limits the size and quantity of the inner pipes and cannot continue to increase. The maximum is 3 inner pipes of DN200. If the system flow is increased under this condition, As a result, the flow velocity in the casing reaches more than 3m / s, resulting in excessive system resistance loss, large equipment wear, high equipment manufacturing costs, and high operating costs, which are not economically reasonable
[0010]2. When the casing plus residence tank dissolution process slurry is heated in the casing, scarring is easy to occur (mainly caused by kaolinite reaction), The heat transfer coefficient of the casing heat exchanger is at least 1000Kcal / m2.h.℃ without scarring; the heat transfer efficiency drops rapidly in the case of scarring, and the heat transfer coefficient drops to 550 About Kcal / m2.h.℃, affect the heat transfer effect

Method used

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  • Tube array and remaining tank dissolving-out system and method for gibbsite bauxite
  • Tube array and remaining tank dissolving-out system and method for gibbsite bauxite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The structure of the dissolution system of gibbsite-type bauxite is as follows: figure 1 As shown, it includes a circulating mother liquor tank 1, a tube heating device, an insulation retention tank 8, a flash evaporation device and a dilution device;

[0043] The tube heating device consists of a first-level tube preheater 3, a second-level tube preheater 4, a third-level tube preheater 5, a condensate water tube heater 6 and a fresh steam tube heater 7 in series. , each tube preheater and tube heater are equipped with a medium inlet, a medium outlet, a material inlet and a material outlet;

[0044] The flash device is composed of a primary flash evaporator 9, a secondary flash evaporator 10 and a tertiary flash evaporator 11 in series; each flash evaporator is provided with a feed inlet, a material outlet and a gas outlet;

[0045] The insulation retention tank 8 is provided with a mother liquid feed port, a slurry feed port and a discharge port;

[0046] Circulatin...

Embodiment 2

[0066] The column tube of gibbsite type bauxite adds the stripping system structure of retention tank with embodiment 1;

[0067] The column tube of gibbsite type bauxite adds the stripping method of retention tank with embodiment 1, difference is:

[0068] (1) The temperature of the circulating mother liquor is 185°C after being heated by the new steam tube heater, and then enters the insulation retention tank;

[0069] (2) The desiliconized pulp in the desiliconized tank is transported to the heat preservation tank through the dissolution feeding pump. The temperature of the desiliconized pulp is 103°C. The desiliconized pulp is mixed with the circulating mother liquor for dissolution. The mixing amount is based on the temperature of the mixed material At 155°C, the dissolution time is 40 minutes;

[0070] (3) After the circulating mother liquor enters the three-stage tube preheater, it is heated to 120°C; after entering the condensate tube heater, it is heated to 125°C;

...

Embodiment 3

[0074] The column tube of gibbsite type bauxite adds the stripping system structure of retention tank with embodiment 1;

[0075] The column tube of gibbsite type bauxite adds the stripping method of retention tank with embodiment 1, difference is:

[0076] (1) The temperature of the circulating mother liquor is 190°C after being heated by the new steam tube heater, and then enters the insulation retention tank;

[0077] (2) Transport the desiliconized pulp in the desiliconized tank to the heat preservation tank through the dissolution feeding pump. The temperature of the desiliconized pulp is 105°C. The desiliconized pulp is mixed with the circulating mother liquor for dissolution. The mixing amount is based on the temperature of the mixed material At 160°C, the dissolution time is 30 minutes;

[0078] (3) After the circulating mother liquor enters the three-stage tube preheater, it is heated to 115°C; after entering the condensate tube heater, it is heated to 120°C;

[007...

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Abstract

The invention discloses a tube array and remaining tank dissolving-out system and a tube array and remaining tank dissolving-out method for gibbsite bauxite and belongs to the technical field of alumina production. The dissolving-out system comprises a circulating mother liquor groove, a heat preservation remaining tank, a flash evaporation device and a dilution device; the circulating mother liquor groove is communicated with a tube array heating device through a mother liquor feed pump; the tube array heating device is formed by connecting a first-level tube array preheater, a second-level tube array preheater and a third-level tube array preheater, a condensed water tube array preheater, and a live steam tube array preheater in series; the method comprises the following steps of: conveying the circulating mother liquor in the circulating mother liquor groove into the tube array heating device by using the mother liquor feed pump, heating to 180 to 190 DEG C, and feeding the circulating mother liquor into the heat preservation remaining tank; and conveying desilicication ore pulp in a desilicication groove into the heat preservation remaining tank, mixing the desilicication ore pulp and the circulating mother liquor, and dissolving out, feeding the pulp obtained after dissolving into the flash evaporation device and performing flash evaporation and then feeding into the dilution device. The system and the method can improve the treatment capacity of pulp, save energy sources, and reduce the production cost and equipment corrosion.

Description

technical field [0001] The invention belongs to the technical field of alumina production, in particular to a stripping system and method for gibbsite-type bauxite with tubes and retention tanks. 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 / 3)H 2 O+2NaOH+aq→2NaAl(OH) 4 +aq [0004] Due to the different chemical compositions of bauxite ores in various places, the required dissolution temperature varies greatly; domestic ores are mainly diaspore type, and the dissolution method of high temperature and high alkali is generally used; foreign ones are mainly trihydrate aluminum For the mixed type of gibbsite plus boehmite (and boeh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 许文强李宝林邢国春杨再明
Owner NORTHEASTERN UNIV ENG & RES INST CO LTD
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