CN112299459B - Method for preventing hydrolysis in separation process of bauxite dissolution experiment - Google Patents
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- CN112299459B CN112299459B CN202011098979.2A CN202011098979A CN112299459B CN 112299459 B CN112299459 B CN 112299459B CN 202011098979 A CN202011098979 A CN 202011098979A CN 112299459 B CN112299459 B CN 112299459B
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- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/06—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process
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- C—CHEMISTRY; METALLURGY
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- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
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- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/06—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process
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Abstract
The invention relates to a method for preventing hydrolysis in a separation process of a bauxite dissolution experiment, which comprises the following steps: 1) Preparing a sodium aluminate solution hydrolysis inhibitor, wherein the ratio of absolute ethyl alcohol, EDTA, mannitol, sodium tartrate and water is (1-10): 1-20): 50-80; 2) Bauxite is subjected to aluminum oxide dissolution by adopting a hydrothermal reaction kettle or a dissolution steel ball; 3) Reducing the temperature to be below 100 ℃ after dissolution, opening a hydrothermal reaction kettle or a dissolution steel bullet, adding a hydrolysis inhibitor which accounts for 1 per mill to 2 percent of the total volume of the dissolution solution into the dissolution solution, and stirring; 4) And carrying out solid-liquid separation and washing to obtain stable sodium aluminate solution and red mud. The invention synthesizes the hydrolysis inhibitor, can stabilize the low molecular ratio sodium aluminate solution for more than 2 hours, and ensures the accuracy of the bauxite dissolution experiment.
Description
Technical Field
The invention belongs to the field of methods for bauxite processing experiments, and particularly relates to a method for preventing hydrolysis in a separation process of a bauxite dissolution experiment.
Background
Aluminum is the second largest metal material which is second only to steel globally, and is widely applied to various industries of national economy such as buildings, transportation, mechanical equipment, power and electrical appliances and the like. The rapid development of the aluminum industry drives the development of the aluminum electrolysis raw material-alumina industry, according to the statistics of Ministry of industry and belief, the yield of the alumina in 2019 of China is 7247.4 million tons, which accounts for 62 percent of the global yield of the alumina, and is the first world large producing countries of the alumina, but the bauxite resource is relatively short, so that the bauxite is frequently replaced in the alumina factories of China. Before different bauxite is applied to production, a bauxite processing experiment is carried out to determine the dissolution and sedimentation performance of the bauxite, and the industrial production is guided. In addition, before an alumina plant is newly built, in order to determine the feasibility of plant building, a target ore dissolution experiment must be carried out, technical and economic evaluation is further carried out, the most economic use condition of the ore is determined, and the overall profit maximization of an enterprise is ensured.
In the bauxite dissolution experiment process, a low-molecular-ratio sodium aluminate solution (the molecular ratio is 1.2-2.0) is formed after the bauxite is dissolved out, and the low-molecular-ratio sodium aluminate solution is quite unstable and can be hydrolyzed to generate aluminum hydroxide in the solid-liquid separation process after the bauxite is dissolved out, so that the experiment result has a large difference with the real bauxite dissolution data.
Disclosure of Invention
Object of the Invention
Aiming at the problems, the invention provides a method for preventing hydrolysis in the separation process of a bauxite dissolution experiment, which realizes the inhibition of the hydrolysis of a low molecular weight sodium aluminate solution and ensures that the stabilization time is more than 2 hours.
Technical scheme
A method for preventing hydrolysis in a separation process of a bauxite dissolution experiment comprises the following steps:
1) Preparing a sodium aluminate solution hydrolysis inhibitor, wherein the inhibitor consists of absolute ethyl alcohol, EDTA, mannitol, sodium tartrate and water, and the proportion of the absolute ethyl alcohol, the EDTA, the mannitol, the sodium tartrate and the water is (1-10): 1-20): 50-80;
2) The bauxite is subjected to aluminum oxide dissolution by adopting a hydrothermal reaction kettle or a dissolution steel ball;
3) Reducing the temperature to be below 100 ℃ after dissolution, opening a hydrothermal reaction kettle or a dissolution steel bullet, adding a hydrolysis inhibitor which accounts for 1 per mill to 2 percent of the total volume of the dissolution solution into the dissolution solution, and stirring;
4) And carrying out solid-liquid separation and washing to obtain the stable sodium aluminate solution and the red mud.
Preferably, in the step 2), the bauxite is one or a mixture of more of diasporic bauxite, boehmite bauxite or gibbsite bauxite.
Further, in the step 2), the alumina in the bauxite is dissolved out by using alkali liquor, and the dissolving-out temperature of the bauxite is 120-300 ℃.
Preferably, in the step 3), the hydrolysis inhibitor is added by one of a dropper, a pipette and an electronic pipette.
Preferably, in the step 4), the solid-liquid separation is one of centrifugal separation, vacuum filtration separation or filter-pressing separation.
Preferably, in the step 4), the stable sodium aluminate solution is a sodium aluminate solution with a molecular ratio of 1.2-2.0, and is not hydrolyzed when placed for more than 2 hours at normal temperature.
Preferably, in step 3), open hydrothermal reaction kettle or dissolve out after the steel bullet, need to dissolve out solution and pour into in the cooling ball, the cooling ball includes outer ball and inner ball, the inner ball is located the inside of outer ball, formed the runner between inner ball and the outer ball, the both ends of inner ball are connected with a communicating pipe respectively, communicating pipe passes outer ball and communicates the inside of inner ball and the inside of cooling bin, the outer ball passes through the support frame and supports in the cooling bin, be equipped with the coolant liquid in the cooling bin, the coolant liquid submerges the cooling ball including, the upper end of outer ball is connected with the feed liquor pipe, the inlet of feed liquor pipe is located outside the coolant liquid, the lower extreme of outer ball is connected with the drain pipe, the drain pipe has passed the lateral wall of cooling bin and the liquid outlet is located the inside top of mixing bin, the inhibitor of hydrolysising adds toward mixing bin, the upper end of mixing bin is fixed with agitator motor, agitator motor's pivot lower extreme has the (mixing) shaft through the coupling joint, the lower extreme of (mixing shaft is connected with the stirring rake.
Preferably, the upper end of feed liquor pipe is equipped with a funnel, is equipped with the screen cloth in the funnel, and the screen cloth is the filter screen that can filter more than or equal to 0.5mm particle diameter solid.
Preferably, the number of the screens is 2 or more.
Advantages and effects
The hydrolysis inhibitor is synthesized, and is added into the slurry after the bauxite is dissolved out, so that the low-molecular-ratio sodium aluminate solution can be stabilized for more than 2 hours, and the accuracy of the bauxite dissolution experiment is ensured.
Drawings
FIG. 1 is a schematic view of a cooling and mixing apparatus.
Description of the reference numerals: 1. cooling bin, cooling liquid 2, outer ball 3, inner ball 4, communicating pipe 5, liquid inlet pipe 6, funnel 7, screen 8, support frame 9, liquid outlet pipe 10, mixing bin 11, dissolving solution 12, stirring motor 13, coupler 14, stirring shaft 15, stirring shaft 16 and stirring paddle.
Detailed Description
A method for preventing hydrolysis in a separation process of a bauxite dissolution experiment comprises the following steps:
1) Preparing a sodium aluminate solution hydrolysis inhibitor, wherein the inhibitor consists of absolute ethyl alcohol, EDTA, mannitol, sodium tartrate and water, and the proportion of the absolute ethyl alcohol, the EDTA, the mannitol, the sodium tartrate and the water is (1-10): 1-20): 50-80.
2) Dissolving alumina in bauxite by using alkali liquor, and dissolving the alumina by using a hydrothermal reaction kettle or a dissolving steel ball, wherein the dissolving temperature of the bauxite is 120-300 ℃; the bauxite is one or a mixture of more of diasporic bauxite, boehmite bauxite or gibbsite bauxite.
3) Reducing the temperature to below 100 ℃ after dissolution, opening a hydrothermal reaction kettle or a dissolution steel ball, adding a hydrolysis inhibitor which is 1 per mill-2% of the total volume of the dissolution solution into the dissolution solution by adopting one of a dropper, a pipette or an electronic pipette, and stirring.
4) Solid-liquid separation and washing are carried out by adopting one solid-liquid separation method of centrifugal separation, vacuum filtration separation or filter pressing separation, so as to obtain stable sodium aluminate solution and red mud, wherein the stable sodium aluminate solution has a molecular ratio of 1.2-2.0, and is not hydrolyzed when placed at normal temperature for more than 2 hours.
Preferably, in step 3), cooling and mixing equipment can be used, so that the temperature of the dissolution solution can be reduced to below 100 ℃ and can be rapidly reduced to a lower temperature, ineffective evaporation caused by adding the hydrolysis inhibitor due to overhigh temperature can be avoided, and the mixing effect can be improved. After the hydrothermal reaction kettle is opened or steel shot is dissolved out, the dissolved solution 12 is poured into the cooling ball, the cooling ball comprises an outer ball 3 and an inner ball 4, the inner ball 4 is positioned inside the outer ball 3, a flow channel is formed between the inner ball 4 and the outer ball 3, two ends of the inner ball 4 are respectively connected with a communicating pipe 5, the communicating pipe 5 penetrates through the outer ball 3 to communicate the inside of the inner ball 4 with the inside of the cooling bin 1, the outer ball 3 is supported in the cooling bin 1 through a support frame 9, cooling liquid 2 is arranged in the cooling bin 1, the cooling ball 2 is submerged in the cooling ball, the upper end of the outer ball 3 is connected with a liquid inlet pipe 6, a liquid inlet of the liquid inlet pipe 6 is positioned outside the cooling liquid 2, the upper end of the liquid inlet pipe 6 is provided with a funnel 7, a screen 8 is arranged in the funnel 7, the screen 8 is a filter screen capable of filtering solids with the particle sizes larger than or equal to 0.5mm, the number of the screen 8 is larger than or equal to 2, the lower end of the outer ball 3 is connected with a liquid outlet pipe 10, the liquid outlet pipe 10 penetrates through the side wall of the cooling bin 1 and is positioned above the inner part of the mixing bin 11, a stirring motor 13 is connected with a stirring shaft stirrer 13, and a stirring shaft 13 is connected with a stirring motor.
Example 1
1) Preparing a sodium aluminate solution hydrolysis inhibitor, wherein the ratio of absolute ethyl alcohol, EDTA, mannitol, sodium tartrate and water is 1.
2) Dissolving alumina in bauxite by using alkali liquor, and dissolving the alumina by using a hydrothermal reaction kettle, wherein the dissolving temperature of the bauxite is 300 ℃; the bauxite is a hydraulic aluminum bauxite.
3) And reducing the temperature to 99 ℃ after dissolution, opening the hydrothermal reaction kettle, adding a hydrolysis inhibitor with the total volume of 1 per mill of the dissolution solution into the dissolution solution by using a dropper, and stirring.
4) And performing solid-liquid separation and washing by adopting a solid-liquid separation method of centrifugal separation to obtain a stable sodium aluminate solution and red mud, wherein the stable sodium aluminate solution has a molecular ratio of 1.2, and is placed at normal temperature for 2 hours without hydrolysis.
Example 2
1) The sodium aluminate solution hydrolysis inhibitor is prepared, and the ratio of the anhydrous ethanol, the EDTA, the mannitol, the sodium tartrate and the water is 10.
2) Dissolving alumina in bauxite by using alkali liquor, and dissolving the alumina by using a dissolving steel ball, wherein the dissolving temperature of the bauxite is 120 ℃; the bauxite is boehmite type bauxite.
3) And reducing the temperature to 90 ℃ after dissolution, opening a dissolution steel bomb, adding a hydrolysis inhibitor with the total volume of 8 per mill of the dissolution solution into the dissolution solution by using a pipette, and stirring.
4) And (3) carrying out solid-liquid separation and washing by adopting a solid-liquid separation method of vacuum filtration separation to obtain a stable sodium aluminate solution and red mud, wherein the stable sodium aluminate solution has a molecular ratio of 1.4, and is placed at normal temperature for 3 hours without hydrolysis.
Example 3
1) Preparing a sodium aluminate solution hydrolysis inhibitor, wherein the ratio of absolute ethyl alcohol, EDTA, mannitol, sodium tartrate and water is 5.
2) Dissolving alumina in bauxite by using alkali liquor, and dissolving the alumina by using a hydrothermal reaction kettle, wherein the dissolving temperature of the bauxite is 180 ℃; the bauxite is gibbsite type bauxite.
3) And (3) reducing the temperature to 88 ℃ after dissolution, opening the hydrothermal reaction kettle, adding a hydrolysis inhibitor accounting for 1 percent of the total volume of the dissolution solution into the dissolution solution by using an electronic pipette, and stirring.
4) And (3) carrying out solid-liquid separation and washing by adopting a solid-liquid separation method of centrifugal separation, vacuum filtration separation or filter pressing separation to obtain stable sodium aluminate solution and red mud, wherein the stable sodium aluminate solution has a molecular ratio of 1.7, and is not hydrolyzed after being placed for 4 hours at normal temperature.
Example 4
1) Preparing a sodium aluminate solution hydrolysis inhibitor, wherein the ratio of absolute ethyl alcohol, EDTA, mannitol, sodium tartrate and water is 3.
2) Dissolving alumina in bauxite by using alkali liquor, and dissolving the alumina by using a dissolving steel ball, wherein the dissolving temperature of the bauxite is 250 ℃; the bauxite is a mixture of diasporic bauxite, boehmite bauxite and gibbsic bauxite.
3) After dissolution, the temperature is reduced to 80 ℃, the dissolution steel bomb is opened, a hydrolysis inhibitor accounting for 2 percent of the total volume of the dissolution solution is added into the dissolution solution by a dropper, and stirring is carried out.
4) And performing solid-liquid separation and washing by adopting a solid-liquid separation method of filter pressing separation to obtain a stable sodium aluminate solution and red mud, wherein the stable sodium aluminate solution has a molecular ratio of 2.0, and is placed at normal temperature for 10 hours without hydrolysis.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the invention and are not intended to limit the embodiments of the present invention, and that various other modifications and changes may be made on the basis of the above description by those skilled in the art.
Claims (8)
1. A method for preventing hydrolysis in a separation process of a bauxite dissolution experiment is characterized in that: the method comprises the following steps:
1) Preparing a sodium aluminate solution hydrolysis inhibitor, wherein the inhibitor consists of absolute ethyl alcohol, EDTA, mannitol, sodium tartrate and water, and the proportion of the absolute ethyl alcohol, the EDTA, the mannitol, the sodium tartrate and the water is (1-10): 1-20): 50-80;
2) The bauxite is subjected to aluminum oxide dissolution by adopting a hydrothermal reaction kettle or a dissolution steel ball;
3) Reducing the temperature to be below 100 ℃ after dissolution, opening a hydrothermal reaction kettle or a dissolution steel bullet, adding a hydrolysis inhibitor which accounts for 1 per mill to 2 percent of the total volume of the dissolution solution into the dissolution solution, and stirring;
4) Carrying out solid-liquid separation and washing to obtain stable sodium aluminate solution and red mud;
in the step 3), after the hydrothermal reaction kettle is opened or the steel shot is dissolved out, the dissolved solution (12) needs to be poured into the cooling ball, the cooling ball includes outer ball (3) and interior ball (4), interior ball (4) are located the inside of outer ball (3), formed the runner between interior ball (4) and outer ball (3), the both ends of interior ball (4) are connected with one communicating pipe (5) respectively, communicating pipe (5) pass outer ball (3) with the inside and the inside intercommunication in cooling storehouse (1) of interior ball (4), outer ball (3) support in cooling storehouse (1) through support frame (9), be equipped with coolant liquid (2) in cooling storehouse (1), including coolant liquid (2) submerge the cooling ball, the upper end of outer ball (3) is connected with feed liquor pipe (6), the inlet of feed liquor pipe (6) is located outside coolant liquid (2), the lower extreme of outer ball (3) is connected with drain pipe (10), drain pipe (10) have passed the lateral wall in cooling storehouse (1) and the liquid outlet is located the inside top in mixing storehouse (11) and the liquid outlet is located the mixing storehouse (11), hydrolysis inhibitor is toward the interior interpolation of mixing storehouse (11), the upper end fixed with stirring storehouse (11) upper end is connected with stirring motor (13), stirring shaft coupling (13) lower extreme (15) is connected with (16).
2. The method for preventing hydrolysis in the separation process of bauxite leaching experiment according to claim 1, characterized in that: in the step 2), the bauxite is one or a mixture of more of diasporic bauxite, boehmite bauxite or gibbsite bauxite.
3. The method for preventing hydrolysis in the separation process of bauxite leaching experiment according to claim 1, characterized in that: in the step 2), the alumina in the bauxite is dissolved out by using alkali liquor, and the dissolution temperature of the bauxite is 120-300 ℃.
4. The method for preventing hydrolysis in the separation process of bauxite leaching experiment according to claim 1, characterized in that: in the step 3), the hydrolysis inhibitor is added by one of a dropper, a pipette or an electronic pipette.
5. The method for preventing hydrolysis in the separation process of bauxite dissolution experiment according to claim 1, characterized in that: in the step 4), the solid-liquid separation adopts one of centrifugal separation, vacuum filtration separation or filter-pressing separation.
6. The method for preventing hydrolysis in the separation process of bauxite dissolution experiment according to claim 1, characterized in that: in the step 4), the stable sodium aluminate solution has a molecular ratio of 1.2-2.0, and is not hydrolyzed after being placed for more than 2 hours at normal temperature.
7. The method for preventing hydrolysis in the separation process of bauxite dissolution experiment according to claim 1, characterized in that: the upper end of feed liquor pipe (6) is equipped with a funnel (7), is equipped with screen cloth (8) in funnel (7), and screen cloth (8) are the filter screen that can filter more than or equal to 0.5mm particle diameter solid.
8. The method of claim 7, wherein the separation process for bauxite dissolution test is characterized in that: the number of the screens (8) is more than or equal to 2.
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