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Gibbsite-type bauxite two-stream digestion process unit and method thereof

A technology of gibbsite type and process equipment, which is applied in chemical instruments and methods, preparation of alkali metal aluminate/alumina/aluminum hydroxide, aluminum compounds, etc. Maintenance, poor separation effect and other problems, to achieve the effect of easy operation and maintenance, reduced operating costs, and simple equipment structure

Pending Publication Date: 2018-04-17
NORTHEASTERN UNIV ENG & RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Methods (1) and (3) two groups of methods use a casing preheater, and the heat source is flashed secondary gas. The main problem is the flashed secondary gas. If the separation effect is not good, it is easy to carry lye , the collected secondary condensed water has a high alkali content. The main difference between the two groups of methods is that the insulation devices are different. Method (1) uses a heat preservation tank with a larger diameter. Insulation, longer length, but easy to maintain and clean
[0009] Method (2) uses a tube preheater, which has less resistance and occupies a smaller area than the casing preheater. It also has a flash cooling system, but the separation effect is not good, it is easy to carry lye, and the collected The secondary condensed water contains high alkali, and the post-treatment is difficult

Method used

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  • Gibbsite-type bauxite two-stream digestion process unit and method thereof
  • Gibbsite-type bauxite two-stream digestion process unit and method thereof
  • Gibbsite-type bauxite two-stream digestion process unit and method thereof

Examples

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Effect test

Embodiment 1

[0054] A process device for gibbsite-type bauxite double-flow method dissolution, its connection diagram is shown in figure 1 , the process device includes a preheater 1, a heater 2, a mixing device 3, a stripping reaction device 4 and a fresh steam condensate tank 11;

[0055]Wherein, the shell-side feed inlet of the preheater 1 is connected to the circulating mother liquid 6 pipeline, the shell-side discharge port of the preheater 1 is connected to the heater 2 tube side, and the heater 2 tube side is connected to the mixing device in turn. 3. The dissolution reaction device 4 is connected in sequence, and the outlet of the dissolution reaction device 4 is connected to the tube side of the preheater 1;

[0056] Described mixing device 3 is connected with raw ore slurry 5 pipelines;

[0057] The shell-side feed port of the heater 2 is connected with the high-pressure fresh steam 7 pipeline, and the shell-side discharge port of the heater 2 is connected with the live steam co...

Embodiment 2

[0071] A process device for gibbsite-type bauxite double-flow method dissolution, its connection diagram is shown in Figure 5 , the process device includes a preheater 1, a heater 2, a mixing device 3, a stripping reaction device 4 and a fresh steam condensate tank 11;

[0072] Wherein, the shell-side feed inlet of the preheater 1 is connected to the circulating mother liquid 6 pipeline, the shell-side discharge port of the preheater 1 is connected to the heater 2 tube side, and the heater 2 tube side is connected to the mixing device in turn. 3. The dissolution reaction device 4 is connected in sequence, and the outlet of the dissolution reaction device 4 is connected to the tube side of the preheater 1;

[0073] Described mixing device 3 is connected with raw ore slurry 5 pipelines;

[0074] The shell-side feed port of the heater 2 is connected with the high-pressure fresh steam 7 pipeline, and the shell-side discharge port of the heater 2 is connected with the live steam ...

Embodiment 3

[0087] A process device for gibbsite-type bauxite double-flow method dissolution, its connection diagram is shown in image 3 , the process unit comprises a first preheater 1-1, a second preheater 1-2, a heater 2, a mixing device 3, a stripping reaction device 4 and a new steam condensed water tank 11;

[0088] Wherein, the shell-side feed port of the first preheater 1-1 is connected with the circulation mother liquid 6 pipeline, and the shell-side discharge port of the first preheater 1-1 is connected with the second preheater 1-2 The tube side is connected, and then connected to the heater 2 tube side, and the heater 2 tube side is connected to the mixing device 3 and the dissolution reaction device 4 in sequence, and the discharge port of the dissolution reaction device 4 is connected to the first preheater 1-1 tube connection;

[0089] Described mixing device 3 is connected with raw ore slurry 5 pipelines;

[0090] The shell-side feed inlet of the heater 2 is connected t...

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Abstract

A gibbsite-type bauxite two-stream digestion process unit and a method thereof belong to the technical field of alumina digestion. The process unit comprises a preheater, a heater, a mixing device, adigestion reactor and a new steam condensation water tank. The process method comprises the following steps: part of 85-95 DEG C circulating mother liquor and qualified digested pulp undergo countercurrent heat exchange in the preheater; part of circulating mother liquor preheated to 113-120 DEG C is heated to 165-200 DEG C by new steam, and the heated circulating mother liquor and ore pulp feed are fully mixed until temperature reaches 135-155 DEG C after the mixing so as to obtain digested pulp; the digested pulp enter the digestion reactor for heat insulation and staying for 30-60 min to obtain qualified digested pulp; and the qualified digested pulp enters the preheater tube to undergo heat exchange with the 85-95 DEG C circulating mother liquor and then the digested pulp undergoes redmud separation and washing. By the method of the invention, the technological process can be simplified, process difficulty is reduced, and investment and operational costs are lowered.

Description

technical field [0001] The invention belongs to the technical field of alumina leaching, and in particular relates to a process device and method for gibbsite-type bauxite leaching by a double-flow method. Background technique [0002] More than 95% of alumina in the world is produced from bauxite. Bauxite is an ore mainly composed of gibbsite, boehmite or diaspore. According to the different forms and contents of aluminum-containing minerals in bauxite, bauxite is divided into three types: Diaspore type, boehmite type, diaspore type and various mixed ores. Due to the different chemical activity of alumina hydrate in different types of bauxite, their dissolution properties vary greatly. The main dissolution processes for producing alumina include high and low temperature single-flow method and double-flow method. Currently, there are two dissolution processes. In the single-flow method, during the indirect heating process of the ore pulp, a large amount of impurity minera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/06
CPCC01F7/064
Inventor 邢国春邱峰杨影许文强赵成明李伟
Owner NORTHEASTERN UNIV ENG & RES INST CO LTD
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