Sodium aluminate solution preparation system

Abstract

The utility model belongs to the technical field of fine aluminum oxide production, and relates to a sodium aluminate solution preparation system, which comprises a reaction tank and a settling tank, the reaction tank is connected with the settling tank, lime milk solution is introduced into the reaction tank, and flocculant emulsion is introduced into the settling tank. According to the sodium aluminate solution preparation system, the flocculant emulsion with a certain concentration is added, slightly soluble calcium hydroxide is flocculated, the sedimentation effect is achieved, the separation purpose is achieved, the process is simple and convenient, and operation is easy.

Description

Technical Field

[0001] The utility model relates to the technical field of fine alumina production, in particular to a sodium aluminate solution preparation system. Background Art

[0002] The essence of alkaline method of producing alumina is to react alumina in bauxite with alkali to form sodium aluminate solution, and then decompose the sodium aluminate solution according to different decomposition processes to obtain aluminum hydroxide particles. The aluminum hydroxide particles are washed, dried, crushed and other processes to produce aluminum hydroxide products that meet the different needs of downstream production companies.

[0003] In the sintering production process, the entire production process is directly related to the sodium aluminate solution, which contains a variety of trace elements such as As, Cd, Cr, Cu, Fe, Ga, Ge, V, Zn, Mg, Mn, Ni, P, Sb, Li, In, Sn, Ti, B, Si, K, Ca, Rb, and S. The trace element content in the sodium aluminate solution has a significant impact on the trace element content in aluminum hydroxide products produced by different decomposition processes. Therefore, a deep understanding of the chemical properties of the sodium aluminate solution is of great significance both in theory and in practice for optimizing and adjusting the control of the production process, understanding the enrichment and loss of various trace elements in different links, modifying the production process and control conditions, and improving technical and economic indicators and economic effects.

[0004] In the sintering production process, refined sodium aluminate solution is produced through multiple steps, including clinker dissolution, red mud sedimentation and separation, desiliconization, and leaf filtration. The trace element content of the sodium aluminate solution plays a crucial role in the trace element content of the aluminum hydroxide product decomposed under different decomposition process conditions. Therefore, the quality of the sodium aluminate solution determines the key technical control parameters in alumina production. Utility Model Content

[0005] In view of this, the utility model provides a sodium aluminate solution preparation system.

[0006] Specifically, the present invention is achieved through the following technical solutions:

[0007] According to a first aspect of the present invention, a sodium aluminate solution preparation system is provided, comprising: a reaction tank and a sedimentation tank, wherein the reaction tank and the sedimentation tank are connected, the reaction tank is connected to a lime milk solution, and the sedimentation tank is connected to a flocculant emulsion.

[0008] Optionally, the method further comprises: a metering pump, the sedimentation tank is connected to the metering pump, and the flocculant emulsion is connected to the sedimentation tank via the metering pump.

[0009] Optionally, the method further comprises: a mixer, wherein the mixer is connected to the metering pump.

[0010] Optionally, it further includes: a filter, which is connected to the sedimentation tank.

[0011] Optionally, it further includes: a leaf filter, which is connected to the sedimentation tank.

[0012] Optionally, it further includes: a second sedimentation tank, which is connected to the reaction tank.

[0013] Optionally, it further includes: a desiliconizer, which is connected to the second sedimentation tank.

[0014] Optionally, it further includes: a feeding trough, and the desiliconization machine is connected to the feeding trough.

[0015] The technical solution provided by the utility model brings at least the following beneficial effects:

[0016] The present application provides a sodium aluminate solution preparation system, which adds a certain concentration of flocculant emulsion to flocculate slightly soluble calcium hydroxide, thereby achieving a sedimentation effect and achieving the purpose of separation. The process is simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention, and together with the description, serve to explain the principles of the present invention.

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 The present invention provides a schematic structural diagram of a sodium aluminate solution preparation system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0021] Figure 1 A sodium aluminate solution preparation system suitable for an embodiment of the present utility model is schematically shown.

[0022] Reference Figure 1 As shown, the present application provides a sodium aluminate solution preparation system, comprising: a reaction tank and a sedimentation tank, wherein the reaction tank and the sedimentation tank are connected, the reaction tank is connected to a lime milk solution, and the sedimentation tank is connected to a flocculant emulsion.

[0023] In the embodiment of the present application, it is necessary to add lime milk to generate calcium silicon slag in the process of reducing silicon dioxide content in sodium aluminate solution to increase the silicon content index. The calcium hydroxide in lime milk has the characteristic of being slightly soluble, and the overflow in the sedimentation tank will be filtered, but some of the Ca2+ ions are difficult to remove by filtering. As the sodium aluminate solution enters the decomposition process, it finally enters AL(OH)3, causing product quality to decline. Therefore, it is necessary to add a certain concentration of flocculant emulsion according to the ratio during the sedimentation of the sedimentation tank to reduce the interfacial tension of the solid-liquid interface, increase the contact angle of the solid-liquid interface, promote the aggregation of surfactants on the interface, flocculate the slightly soluble calcium hydroxide, reduce the Ca ion content in the sodium aluminate solution, and meet the production indicators of downstream merchants.

[0024] Exemplarily, it further includes: a metering pump, the sedimentation tank is connected to the metering pump, and the flocculant emulsion is connected to the sedimentation tank via the metering pump.

[0025] In the embodiment of the present application, the metering pump is used to calculate the content of the flocculant emulsion entering the sedimentation tank.

[0026] Exemplarily, it further includes: a mixer, wherein the mixer is connected to the metering pump.

[0027] In the embodiment of the present application, the mixer is used to receive alkaline water and flocculant, and mix the two to prepare flocculant emulsion.

[0028] Exemplarily, it further includes: a filter, which is connected to the sedimentation tank.

[0029] In the embodiment of the present application, the bottom flow in the sedimentation tank enters the filter for filtering operation to obtain calcium silicon slag.

[0030] Exemplarily, it also includes: a leaf filter, which is connected to the sedimentation tank.

[0031] In the embodiment of the present application, the overflow in the sedimentation tank enters the leaf filter to obtain a sodium aluminate solution.

[0032] Exemplarily, it further includes: a second sedimentation tank, which is connected to the reaction tank.

[0033] In the embodiment of the present application, the second sedimentation tank is used to sediment the raw materials to make them more fully mixed.

[0034] Exemplarily, it further includes: a desiliconizer, which is connected to the second sedimentation tank.

[0035] In the embodiment of the present application, the desiliconizer removes silicon elements from the raw materials through the principle of chemical reaction.

[0036] Exemplarily, it further includes: a feeding trough, and the desiliconization machine is connected to the feeding trough.

[0037] In the embodiment of the present application, the feeding trough is used to receive raw materials.

[0038] In order to test the actual effect of the present invention, the indicators of the sodium aluminate solution preparation system of the present application and the sodium aluminate solution preparation system of the present application are compared, as shown in the following table:

[0039]

[0040]

[0041]

[0042]

[0043]

[0044] The above data demonstrates that the performance of the sodium aluminate solution preparation system is significantly lower (better) than that achieved without the system, with the Ca content reduced by an average of 2.1 ppm compared to the previous period. This reduction in feed elements significantly reduces the Ca content in the Al(OH)3 solution during the decomposition process.

[0045] The present application provides a sodium aluminate solution preparation system, which adds a certain concentration of flocculant emulsion to flocculate slightly soluble calcium hydroxide, thereby achieving a sedimentation effect and achieving the purpose of separation. The process is simple and easy to operate.

[0046] It should be noted that, in this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inside," "outside," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0047] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0048] Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0049] Furthermore, the terms "first," "second," etc., are primarily used to distinguish between different devices, elements, or components (which may or may not be of the same type and configuration), and are not intended to indicate or imply the relative importance or quantity of the devices, elements, or components indicated. Unless otherwise specified, "plurality" means two or more.

[0050] The foregoing description is intended only to provide specific embodiments of the present invention, intended to enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but rather to be construed in the broadest manner consistent with the principles and novel features claimed herein.

Claims

1. A sodium aluminate solution preparation system, characterized in that: include: A reaction tank and a sedimentation tank, wherein the reaction tank and the sedimentation tank are connected, the reaction tank is connected to a lime milk solution, and the sedimentation tank is connected to a flocculant emulsion.

2. The sodium aluminate solution preparation system according to claim 1, characterized in that: Also includes: A metering pump is provided, wherein the sedimentation tank is connected to the metering pump, and the flocculant emulsion is connected to the sedimentation tank via the metering pump.

3. The sodium aluminate solution preparation system according to claim 2, characterized in that: Also includes: A mixer is connected to the metering pump.

4. The sodium aluminate solution preparation system according to claim 1, characterized in that: Also includes: A filter is connected to the sedimentation tank.

5. The sodium aluminate solution preparation system according to claim 1, characterized in that: Also includes: A leaf filter is connected to the sedimentation tank.

6. The sodium aluminate solution preparation system according to claim 1, characterized in that: Also includes: A second sedimentation tank is connected to the reaction tank.

7. The sodium aluminate solution preparation system according to claim 6, characterized in that: Also includes: A desiliconizer is connected to the second settling tank.

8. The sodium aluminate solution preparation system according to claim 7, characterized in that: Also includes: A feeding trough is provided, and the desiliconizing machine is connected to the feeding trough.

Images