CN113477408B - Application of curdlan serving as inhibitor in iron ore reverse flotation in mineral processing field and application method - Google Patents
Application of curdlan serving as inhibitor in iron ore reverse flotation in mineral processing field and application method Download PDFInfo
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- CN113477408B CN113477408B CN202110823346.1A CN202110823346A CN113477408B CN 113477408 B CN113477408 B CN 113477408B CN 202110823346 A CN202110823346 A CN 202110823346A CN 113477408 B CN113477408 B CN 113477408B
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/018—Mixtures of inorganic and organic compounds
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- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/02—Froth-flotation processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/06—Depressants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2203/00—Specified materials treated by the flotation agents; specified applications
- B03D2203/02—Ores
- B03D2203/04—Non-sulfide ores
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Abstract
The application of curdlan serving as an inhibitor in iron ore reverse flotation in the field of mineral processing and an application method belong to the field of industrial application of curdlan. So that iron minerals can be enriched from gangue minerals. Meanwhile, the application field of the curdlan is widened.
Description
Technical Field
The invention belongs to the field of industrial application of curdlan, and particularly relates to application of curdlan serving as an inhibitor in iron ore reverse flotation in the field of mineral processing and an application method.
Background
The curdlan is linear glucan consisting of 400-500D-glucose residues through beta-1, 3-D-glucoside bonds, and has a complete molecular formula of (C) 6 H 10 O 5 ) n . n is usually 250 or more, and has a molecular weight of about 44000-100000 and an unbranched structure. It is insoluble in water and many organic solvents, but soluble in lye, formic acid, etc. Curdlan has many specific properties, and the sugar forms a thermally irreversible gel, which has edible and various industrial uses. In 1989, japanese korea began to use it as a food gum. The FDA in the united states approved in 1996 for use as a stabilizer, thickener, in food ingredients. The coagulated polysaccharide becomes a food polysaccharide produced by fermentation approved by the FDA after xanthan gum and gellan gum, which provides wider space for further popularization and application of the coagulated polysaccharide. The application of the curdlan and the development of food also reach a new level. It has been produced in japan, canada, etc., and has been developed and applied to many foods in japan and taiwan of china. The process for producing curdlan by adopting a microbial fermentation method in the food fermentation research institute of Jiangsu province in China basically completes industrial tests and is dedicated to the early preparation work of actual industrial production.
Curdlan is applied and developed less in other fields except in the food industry, and patent CN102627956A application and application method of curdlan as a profile control agent in petroleum exploitation discloses a method for applying curdlan in the field of petroleum exploitation. And the application in the mineral processing field is not developed at present.
The curdlan has special properties and has wide application prospect in the aspect of industrial application, but at present, the curdlan is only used as a food additive, so that the application field of the curdlan is very necessary to be widened. In addition, the hematite mainstream inhibitor has large starch consumption, which causes grain waste, while curdlan as microbial fermentation polysaccharide can be extracted from some domestic wastes, which is beneficial to environmental protection.
Disclosure of Invention
The invention aims to develop the application of curdlan serving as an inhibitor in hematite reverse flotation in the field of mineral processing and an application method thereof.
The technical scheme of the invention is as follows:
application of curdlan serving as an inhibitor in iron ore reverse flotation in the field of mineral processing.
The application method of the curdlan serving as an inhibitor in iron ore reverse flotation in the field of mineral processing comprises the following steps:
step 1: weighing curdlan and sodium hydroxide;
step 2: dissolving sodium hydroxide in water to obtain an alkali liquor;
and step 3: heating alkali liquor, starting stirring, adding weighed curdlan, and stirring until the curdlan is completely dissolved and the solution is transparent;
and 4, step 4: diluting the transparent solution with water to obtain curdlan aqueous solution, namely an inhibitor solution;
and 5: adjusting the pH value of the ore pulp, adding an inhibitor solution, stirring, adding an activating agent, stirring, and adding a collecting agent;
step 6: roughing is carried out, primary scavenging is carried out on roughing foam, and a product in the cell is added with a concentration collecting agent and then is concentrated to obtain a cell bottom product, namely iron ore concentrate; the selected foam and the bottom product of the primary scavenging tank are returned to the roughing; performing secondary scavenging on the primary scavenging foam, and returning to the primary scavenging at the bottom of the tank; carrying out tertiary scavenging on the secondary scavenging foam, and returning to secondary scavenging at the bottom of the tank; and obtaining the tailings after the foam is scavenged for three times. The specific process is shown in FIG. 1.
In the step 1, the mass ratio of curdlan to sodium hydroxide is 100 (10-20).
In the step 3, heating the alkali liquor to above 80 ℃, starting stirring, and adding curdlan.
In the step 4, water is added to dilute the curdlan into an aqueous solution with the mass fraction of 0.2-1% of curdlan.
In the step 5, the concentration of the ore pulp is 30-40%, the pH value of the ore pulp is adjusted to 11.5 in the anion reverse flotation process, and the pH value of the ore pulp is adjusted to 9-11 in the cation reverse flotation process;
the adding amount of the inhibitor solution is controlled according to the addition of 200-500g of curdlan per ton of ore;
the activator is calcium chloride or lime, the activator is required to be added in the anion reverse flotation, and the activator is not required to be added in the cation reverse flotation;
the collecting agent is sodium oleate and oxidized paraffin soap in the case of anion reverse flotation, and is dodecylamine or ether amine compound such as 3-decyloxypropylamine (3-decoxypropan-1-amine) in the case of cation reverse flotation.
The inhibitor can be applied to both anion reverse flotation and cation reverse flotation.
The invention has the following effects:
the curdlan can be selectively adsorbed on the surface of the hematite, so that the hydrophilicity of the hematite is increased, the floatability is reduced, and the floatability of gangue minerals such as quartz and the like is not influenced. So that iron minerals can be enriched from gangue minerals. Meanwhile, the application field of the curdlan is widened.
The product has the advantages that:
(1) compared with starch curdlan, the use amount of the curdlan is less;
(2) the curdlan is environment-friendly, degradable, non-toxic and harmless;
(3) compared with inhibitors such as polyacrylic acid and the like, the curdlan solution has good stability;
(4) the curdlan has stronger selectivity relative to a natural starch inhibitor, and is beneficial to improving the recovery rate and grade of iron ore concentrate;
(5) curdlan is also much easier than starch in subsequent product dehydration treatments due to its unique structure and molecular weight, which is a low viscosity polysaccharide.
Starch is a long-chain macromolecular carbohydrate formed by condensing a plurality of glucose monomers through glycosidic bonds, and natural starch is often long in molecular chain, branched and poor in selectivity in application due to the complex structure of the branched chain. It has been reported that potato starch or corn starch has a good inhibitory effect on hematite, whereas tapioca starch has a poor selectivity due to differences in molecular weight and structure. The curdlan is a microbial fermentation product, has a large number of hydroxyl groups, has a molecular weight of about 44000-100000 and has no branched chain structure, so that the occurrence of bridging effect is reduced in the inhibiting effect, and gangue minerals are not easy to be in iron ore concentrate. The characteristics of curdlan determine that the selectivity and the inhibition of curdlan are far stronger than those of some plant polysaccharides such as polyacrylic acid, starch, CMC and the like when iron minerals and gangue minerals are separated, so that the curdlan is far better than the traditional starch inhibitor when being used as a selective inhibitor of iron ores.
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FIG. 1 is a reverse flotation scheme for iron ore.
Detailed Description
Example 1
The application method of curdlan serving as an inhibitor in iron ore reverse flotation in the field of mineral processing comprises the following steps:
step 1: weighing a certain amount of curdlan and sodium hydroxide according to the mass ratio of the curdlan to the sodium hydroxide of 100: 20;
step 2: dissolving sodium hydroxide in water to obtain an alkali liquor;
and step 3: heating alkali solution to 85 deg.C, stirring, adding weighed curdlan, stirring for 15min to dissolve completely, and making the solution transparent;
and 4, step 4: diluting the transparent solution with water to obtain an aqueous solution with the mass fraction of curdlan being 1%, namely an inhibitor solution;
and 5: preparing an ore sample into ore pulp with the mass concentration of 40%, adjusting the pH value to 11.5, adding an inhibitor solution, an activator and a collector according to the actual weight of the ore sample, specifically, adding the inhibitor solution according to 200g (curdlan)/t, stirring, adding the activator (calcium chloride) according to 800g/t, stirring, and adding the collector (sodium oleate) according to 850 g/t;
step 6: roughing is carried out according to the flow of the figure 1, primary scavenging is carried out on roughing foam, 450g/t of selected collecting agent sodium oleate is added into the product in the tank, and then the product at the bottom of the tank obtained by selecting is iron ore concentrate; the selected foam and the bottom product of the primary scavenging tank are returned to the roughing; performing secondary scavenging on the primary scavenging foam, and returning to the primary scavenging at the bottom of the tank; carrying out tertiary scavenging on the secondary scavenging foam, and returning to secondary scavenging at the bottom of the tank; and obtaining the tailings after the foam is scavenged for three times. The grade of the finally obtained iron ore concentrate is 66.41 percent, and the recovery rate is 75.24 percent.
The samples used in the tests contained the chemical components as shown in the following table:
comparative example 1
The flotation process is the same as that of example 1, and the chemical system is as follows: adding 850g/t of inhibitor (starch), 1000g/t of activator (lime), 750g/t of collector (sodium oleate) and 400g/t of concentrating collector to obtain the iron ore concentrate with the grade of 64.44% and the recovery rate of 69.24%.
In conclusion, the curdlan inhibitor is only one fourth of the using amount of the starch, the taste of the iron ore concentrate is higher than that of the starch inhibitor, the recovery rate is improved by 6 percent, and the utilization rate of iron resources is greatly improved.
Example 2
The application method of curdlan serving as an inhibitor in iron ore reverse flotation in the field of mineral processing comprises the following steps:
step 1: weighing a certain amount of curdlan and sodium hydroxide according to the mass ratio of the curdlan to the sodium hydroxide of 100: 20;
step 2: dissolving sodium hydroxide in water to obtain an alkali liquor;
and step 3: heating alkali solution to 85 deg.C, stirring, adding weighed curdlan, stirring for 15min to dissolve completely, and making the solution transparent;
and 4, step 4: diluting the transparent solution with water to obtain an aqueous solution with the mass fraction of curdlan being 1%, namely an inhibitor solution;
and 5: preparing an ore sample into ore pulp with the mass concentration of 40%, adjusting the pH value to 9, adding an inhibitor solution and a collecting agent according to the actual weight of the ore sample, specifically adding the inhibitor solution according to the ratio of 250g (curdlan)/t, stirring, and adding the collecting agent (cationic collecting agent 3-decyloxypropylamine) according to the ratio of 125 g/t;
step 6: roughing is carried out according to the flow of the figure 1, scavenging is carried out on roughing foam for one time, and a product in a tank is added with 70g/t of a concentration collecting agent (3-decyloxypropylamine) and then is concentrated to obtain a tank bottom product which is iron ore concentrate; the selected foam and the bottom product of the primary scavenging tank are returned to the roughing; performing secondary scavenging on the primary scavenging foam, and returning to the primary scavenging at the bottom of the tank; carrying out tertiary scavenging on the secondary scavenging foam, and returning to the secondary scavenging at the bottom of the tank; and obtaining the tailings after the foam is scavenged for three times. The grade of the finally obtained iron ore concentrate is 67.34%, and the recovery rate is 71.85%.
The samples used in the tests contained the chemical components as shown in the following table:
comparative example 2
The flotation process is the same as example 2, and the chemical system is as follows: 1100g/t of inhibitor (starch), 800g/t of collector (cationic collector DLTB) and 400g/t of concentrating collector (cationic collector DLTB) are added, so that the grade of the obtained iron ore concentrate is 66.44%, and the recovery rate is 67.24%.
In conclusion, the application of curdlan as the inhibitor in the iron ore reverse flotation has better effect than the traditional starch, the usage amount of the curdlan is less than one fourth of the starch, and the iron recovery rate is improved by 4.61 percent.
Example 3
The application method of curdlan serving as an inhibitor in iron ore reverse flotation in the field of mineral processing comprises the following steps:
step 1: weighing a certain amount of curdlan and sodium hydroxide according to the mass ratio of the curdlan to the sodium hydroxide of 100: 20;
step 2: dissolving sodium hydroxide in water to obtain an alkali liquor;
and step 3: heating alkali solution to 85 deg.C, stirring, adding weighed curdlan, stirring for 15min to dissolve completely, and making the solution transparent;
and 4, step 4: diluting the transparent solution with water to obtain an aqueous solution with the mass fraction of curdlan being 1%, namely an inhibitor solution;
and 5: preparing an ore sample into ore pulp with the mass concentration of 40%, adjusting the pH value to 11.5, adding an inhibitor solution, an activator and a collector according to the actual weight of the ore sample, specifically adding the inhibitor solution according to 400g (curdlan)/t, stirring, adding the activator (lime) according to 1000g/t, stirring, and adding the collector (sodium oleate) according to 850 g/t;
step 6: roughing is carried out according to the flow of figure 1, primary scavenging is carried out on roughing foam, and after 400g/t of concentrating collecting agent (sodium oleate) is added into a product in a tank, a tank bottom product obtained by concentrating is iron ore concentrate; the selected foam and the bottom product of the primary scavenging tank are returned to the roughing; performing secondary scavenging on the primary scavenging foam, and returning to the primary scavenging at the bottom of the tank; carrying out tertiary scavenging on the secondary scavenging foam, and returning to secondary scavenging at the bottom of the tank; and obtaining the tailings after the foam is scavenged for three times. The grade of the finally obtained iron ore concentrate is 66.23%, and the recovery rate is 71.23%.
The samples used in the tests contained the chemical components as shown in the following table:
comparative example 3
The flotation process is the same as example 3, and the chemical system is as follows: 900g/t of inhibitor (starch), 1000g/t of activator (lime), 750g/t of collector (sodium oleate) and 350g/t of concentrating collector (sodium oleate) are added, so that the grade of the obtained iron ore concentrate is 65.56 percent, and the recovery rate is 68.24 percent.
Example 4
The application method of curdlan serving as an inhibitor in iron ore reverse flotation in the field of mineral processing comprises the following steps:
step 1: weighing a certain amount of curdlan and sodium hydroxide according to the mass ratio of the curdlan to the sodium hydroxide of 100: 20;
step 2: dissolving sodium hydroxide in water to obtain an alkali liquor;
and step 3: heating alkali solution to 85 deg.C, stirring, adding weighed curdlan, stirring for 15min to dissolve completely, and making the solution transparent;
and 4, step 4: diluting the transparent solution with water to obtain an aqueous solution with the mass fraction of curdlan being 1%, namely an inhibitor solution;
and 5: preparing an ore sample into ore pulp with the mass concentration of 40%, adjusting the pH value to 11.5, adding an inhibitor solution, an activator and a collector according to the actual weight of the ore sample, specifically adding the inhibitor solution according to 400g (curdlan)/t, stirring, adding the activator (lime) according to 1000g/t, stirring, and adding the collector (sodium oleate) according to 900 g/t;
step 6: roughing is carried out according to the flow of figure 1, primary scavenging is carried out on roughing foam, and a product in a tank is added with 450g/t of a concentration collecting agent (sodium oleate) and then is concentrated to obtain a tank bottom product which is iron ore concentrate; the selected foam and the bottom product of the primary scavenging tank are returned to the roughing; performing secondary scavenging on the primary scavenging foam, and returning to the primary scavenging at the bottom of the tank; carrying out tertiary scavenging on the secondary scavenging foam, and returning to secondary scavenging at the bottom of the tank; and obtaining the tailings after the foam is scavenged for three times. The grade of the finally obtained iron ore concentrate is 68.23 percent, and the recovery rate is 85.23 percent.
The samples used in the tests contained the chemical components as shown in the following table:
comparative example 4
The flotation process is the same as in example 4, and the chemical system is as follows: adding 950g/t of inhibitor (starch), 1000g/t of activator (lime), 850g/t of collector (sodium oleate) and 500g/t of concentrating collector (sodium oleate), wherein the grade of the obtained iron ore concentrate is 67.56 percent, and the recovery rate is 78.22 percent.
The curdlan dosage in the above example is less than half of that of starch, however, the grade of the obtained iron concentrate is higher than that of starch, and the iron recovery rate is 7 percent higher than that of the starch used as an inhibitor.
Example 5
The application method of curdlan serving as an inhibitor in iron ore reverse flotation in the field of mineral processing comprises the following steps:
step 1: weighing a certain amount of curdlan and sodium hydroxide according to the mass ratio of the curdlan to the sodium hydroxide of 100: 15;
step 2: dissolving sodium hydroxide in water to obtain an alkali liquor;
and step 3: heating alkali solution to 90 deg.C, stirring, adding weighed curdlan, stirring for 15min to dissolve completely, and making the solution transparent;
and 4, step 4: diluting the transparent solution with water to obtain an aqueous solution with the mass fraction of curdlan being 0.5%, namely an inhibitor solution;
and 5: preparing an ore sample into ore pulp with the mass concentration of 40%, adjusting the pH value to 10, adding an inhibitor solution and a collecting agent according to the actual weight of the ore sample, specifically adding the inhibitor solution according to 300g (curdlan)/t, stirring, and adding the collecting agent (3-decyloxypropylamine) according to 225 g/t;
step 6: roughing is carried out according to the flow of the figure 1, scavenging is carried out on roughing foam for one time, and a product in a tank is added with a concentration collecting agent (3-decyloxypropylamine) at 125g/t and then is concentrated to obtain a tank bottom product which is iron ore concentrate; the selected foam and the bottom product of the primary scavenging tank are returned to the roughing; performing secondary scavenging on the primary scavenging foam, and returning to the primary scavenging at the bottom of the tank; carrying out tertiary scavenging on the secondary scavenging foam, and returning to secondary scavenging at the bottom of the tank; and obtaining the tailings after the foam is scavenged for three times. The grade of the finally obtained iron ore concentrate is 66.23%, and the recovery rate is 81.23%.
The samples used in the tests contained the chemical components as shown in the following table:
comparative example 5
The flotation process is the same as in example 5, and the chemical system is as follows: adding 950g/t of inhibitor (starch), 850g/t of collector (ether amine) and 450g/t of collecting agent (ether amine) for concentration, wherein the grade of the obtained iron ore concentrate is 63.56%, and the recovery rate is 75.22%.
The curdlan dosage in the above example is less than one third of that of starch, however, the grade of the obtained iron concentrate is higher than that of starch, and the iron recovery rate is 6.01 percent higher than that of the starch used as an inhibitor.
Example 6
The application method of curdlan serving as an inhibitor in iron ore reverse flotation in the field of mineral processing comprises the following steps:
step 1: weighing a certain amount of curdlan and sodium hydroxide according to the mass ratio of the curdlan to the sodium hydroxide of 100: 20;
step 2: dissolving sodium hydroxide in water to obtain an alkali liquor;
and step 3: heating alkali solution to 85 deg.C, stirring, adding weighed curdlan, stirring for 15min to dissolve completely, and making the solution transparent;
and 4, step 4: diluting the transparent solution with water to obtain an aqueous solution with the mass fraction of curdlan being 1%, namely an inhibitor solution;
and 5: preparing an ore sample into ore pulp with the mass concentration of 40%, adjusting the pH value to 10, adding an inhibitor solution and a collecting agent according to the actual weight of the ore sample, specifically adding the inhibitor solution according to 300g (curdlan)/t, stirring, and adding the collecting agent (3-decyloxypropylamine) according to 250 g/t;
step 6: roughing is carried out according to the flow of the figure 1, scavenging is carried out on roughing foam for one time, and a product in a tank is added with 100g/t of a concentration collecting agent (3-decyloxypropylamine) and then is concentrated to obtain a tank bottom product which is iron ore concentrate; the selected foam and the bottom product of the primary scavenging tank are returned to the roughing; performing secondary scavenging on the primary scavenging foam, and returning to the primary scavenging at the bottom of the tank; carrying out tertiary scavenging on the secondary scavenging foam, and returning to secondary scavenging at the bottom of the tank; and obtaining the tailings after the foam is scavenged for three times. The grade of the finally obtained iron ore concentrate is 67.23%, and the recovery rate is 82.23%.
The samples used in the tests contained the chemical components as shown in the following table:
comparative example 6
The flotation process is the same as in example 6, and the chemical system is as follows: 900g/t of inhibitor (starch), 850g/t of collector (ether amine) and 450g/t of collecting collector (ether amine) are added, so that the grade of the obtained iron ore concentrate is 65.56 percent, and the recovery rate is 74.82 percent.
Example 7
The application method of curdlan serving as an inhibitor in iron ore reverse flotation in the field of mineral processing comprises the following steps:
step 1: weighing a certain amount of curdlan and sodium hydroxide according to the mass ratio of the curdlan to the sodium hydroxide of 100: 20;
step 2: dissolving sodium hydroxide in water to obtain an alkali liquor;
and step 3: heating alkali solution to 90 deg.C, stirring, adding weighed curdlan, stirring for 15min to dissolve completely, and making the solution transparent;
and 4, step 4: diluting the transparent solution with water to obtain an aqueous solution with the mass fraction of curdlan being 1%, namely an inhibitor solution;
and 5: preparing an ore sample into ore pulp with the mass concentration of 40%, adjusting the pH value to 11.5, adding an inhibitor solution, an activator and a collector according to the actual weight of the ore sample, specifically adding the inhibitor solution according to 500g (curdlan)/t, stirring, adding the activator (lime) according to 1000g/t, stirring, and adding the collector (sodium oleate) according to 1000 g/t;
step 6: roughing is carried out according to the flow of figure 1, primary scavenging is carried out on roughing foam, and after 500g/t of concentration collecting agent (sodium oleate) is added into the product in the tank, the bottom product of the tank obtained by concentration is iron ore concentrate; the selected foam and the bottom product of the primary scavenging tank are returned to the roughing; performing secondary scavenging on the primary scavenging foam, and returning to the primary scavenging at the bottom of the tank; carrying out tertiary scavenging on the secondary scavenging foam, and returning to secondary scavenging at the bottom of the tank; and obtaining the tailings after the foam is scavenged for three times. The grade of the finally obtained iron ore concentrate is 66.51%, and the recovery rate is 82.23%.
The samples used in the tests contained the chemical components as shown in the following table:
comparative example 7
The flotation process is the same as in example 7, and the chemical system is as follows: 1000g/t of inhibitor (starch), 1100g/t of activator (lime), 1000g/t of collector (sodium oleate) and 500g/t of concentrating collector (sodium oleate) are added, so that the grade of the obtained iron ore concentrate is 67.56 percent, and the recovery rate is 78.22 percent.
Example 8
The application method of curdlan serving as an inhibitor in iron ore reverse flotation in the field of mineral processing comprises the following steps:
step 1: weighing a certain amount of curdlan and sodium hydroxide according to the mass ratio of the curdlan to the sodium hydroxide of 100: 20;
step 2: dissolving sodium hydroxide in water to obtain an alkali liquor;
and step 3: heating alkali solution to 85 deg.C, stirring, adding weighed curdlan, stirring for 15min to dissolve completely, and making the solution transparent;
and 4, step 4: diluting the transparent solution with water to obtain an aqueous solution with the mass fraction of curdlan being 1%, namely an inhibitor solution;
and 5: preparing an ore sample into ore pulp with the mass concentration of 40%, adjusting the pH value to 11.5, adding an inhibitor solution, an activator and a collector according to the actual weight of the ore sample, specifically, adding the inhibitor solution according to 350g (curdlan)/t, stirring, adding the activator (lime) according to 1000g/t, stirring, and adding the collector (sodium oleate) according to 900 g/t;
step 6: roughing is carried out according to the flow of figure 1, primary scavenging is carried out on roughing foam, and a product in a tank is added with 450g/t of a concentration collecting agent (sodium oleate) and then is concentrated to obtain a tank bottom product which is iron ore concentrate; the selected foam and the bottom product of the primary scavenging tank are returned to the roughing; performing secondary scavenging on the primary scavenging foam, and returning to the primary scavenging at the bottom of the tank; carrying out tertiary scavenging on the secondary scavenging foam, and returning to secondary scavenging at the bottom of the tank; and obtaining the tailings after the foam is scavenged for three times. The grade of the finally obtained iron ore concentrate is 67.23%, and the recovery rate is 82.23%.
The samples used in the tests contained the chemical components as shown in the following table:
comparative example 8
The flotation process is the same as in example 8, and the chemical system is as follows: adding 950g/t of inhibitor (starch), 1000g/t of activator (lime), 850g/t of collector (sodium oleate) and 500g/t of concentrating collector (sodium oleate), wherein the grade of the obtained iron ore concentrate is 65.56 percent, and the recovery rate is 76.25 percent.
Claims (9)
1. Application of curdlan serving as an inhibitor in iron ore reverse flotation in the field of mineral processing.
2. The application method of curdlan serving as an inhibitor in iron ore reverse flotation in the field of mineral processing is characterized by comprising the following steps:
step 1: weighing curdlan and sodium hydroxide;
step 2: dissolving sodium hydroxide in water to obtain an alkali liquor;
and step 3: heating alkali liquor, starting stirring, adding weighed curdlan, and stirring until the curdlan is completely dissolved and the solution is transparent;
and 4, step 4: diluting the transparent solution with water to obtain curdlan aqueous solution, namely an inhibitor solution;
and 5: adjusting the pH value of the ore pulp, and adding an inhibitor solution, an activating agent and a collecting agent;
step 6: roughing is carried out, primary scavenging is carried out on roughing foam, and a product in the cell is added with a concentration collecting agent and then is concentrated to obtain a cell bottom product, namely iron ore concentrate; the selected foam and the bottom product of the primary scavenging tank are returned to the roughing; performing secondary scavenging on the primary scavenging foam, and returning to the primary scavenging at the bottom of the tank; carrying out tertiary scavenging on the secondary scavenging foam, and returning to secondary scavenging at the bottom of the tank; and obtaining the tailings after the foam is scavenged for three times.
3. The application method of curdlan as an inhibitor in iron ore reverse flotation in the mineral processing field is characterized in that in the step 1, the mass ratio of curdlan to sodium hydroxide is 100 (10-20).
4. The application method of curdlan as the inhibitor in the iron ore reverse flotation in the mineral processing field is characterized in that in the step 3, the curdlan is added after the alkali liquor is heated to be higher than 80 ℃ and stirring is started.
5. The application method of curdlan as the inhibitor in the iron ore reverse flotation in the mineral processing field is characterized in that water is added to dilute the curdlan into an aqueous solution with the mass fraction of 0.2% -1% in the step 4.
6. The method for applying curdlan as an inhibitor in iron ore reverse flotation in the field of mineral processing as claimed in claim 2, wherein in the step 5, the concentration of the ore pulp is 30% -40%, the pH of the ore pulp is adjusted to 11.5 in the case of anion reverse flotation, and the pH of the ore pulp is adjusted to 9-11 in the case of cation reverse flotation.
7. The method for applying curdlan as an inhibitor in the iron ore reverse flotation in the mineral processing field as claimed in claim 2, wherein in the step 5, the adding amount of the inhibitor solution is controlled according to 200 g/ton of ore.
8. The method for applying curdlan as an inhibitor in iron ore reverse flotation in the field of mineral processing as claimed in claim 2, wherein in the step 5, the activator is calcium chloride or lime, the activator is added in anion reverse flotation, and the activator is not added in cation reverse flotation.
9. The application method of curdlan as an inhibitor in iron ore reverse flotation in the field of mineral processing according to claim 2, wherein in the step 5, the collector is sodium oleate or oxidized paraffin soap in the case of anion reverse flotation, and is a dodecylamine or etheramine compound in the case of cation reverse flotation.
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