Oolitic hematite flocculant and oolitic hematite selective dispersing and agglomeration separation method

Abstract

The invention provides oolitic hematite flocculant which is prepared by mixing carboxymethyl starch, sodium acrylate, crosslinking agent and initiator, heating the mixture, reacting for a period of time, and purifying; the flocculant has stronger selective absorbability to hematite, can be used for the selective flocculation (agglomeration) settlement desliming of the oolitic hematite, and can achieve a better agglomeration absorption effect in a lower used amount; the invention also provides an oolitic hematite selective dispersing and agglomeration separation method, so that the process is simple, the ore grinding fineness requirement is low, the high-efficiency agglomeration settlement of the fine hematite can be realized in a shorter time, the all-iron recovery rate and grade are better; and the separation method can be carried out under the condition of low alkalescence or the natural pH value of pulp, has little harm to the corrosion of equipment, and is applicable to the separation of low-grade fine inlaid oolitic hematite.

Description

technical field

[0001] The invention relates to sorting of hematite, in particular to a flocculant for beneficiation of oolitic hematite and a method for selectively dispersing and agglomerating the oolitic hematite. Background technique

[0002] One-ninth of my country's iron ore reserves is oolitic hematite, accounting for 30% of my country's hematite reserves. This type of oolitic hematite often forms large mines, such as the Xuanlong iron mine in the north and the Ningxiang iron mine in the south. Oolitic hematite is extremely finely distributed and often coexists or wraps with siderite, oolitic chlorite and phosphorus-containing minerals, so it is currently recognized as the most difficult type of iron ore at home and abroad. Because oolitic hematite has extremely fine particle size and its layer-by-layer wrapping structure, it is not conducive to the dissociation of ore monomers, and the ore is particularly easy to form fine particles after crushing and grinding, with...

Examples

Embodiment 1

[0053] Prepare flocculant according to the above steps, wherein:

[0054] The amount of each component in step a is 10% by weight of carboxymethyl starch, 50% of acrylic acid, 0.5% of initiator, 0.01% of crosslinking agent, and 39.49% of deionized water; in step b, the temperature of the mixed material is raised to 70 ℃, heat preservation for 3 hours; during Soxhlet extraction in step d, the weight ratio of the crude product to methanol is 2.5, the extraction time is 24 h, and finally the flocculant product is obtained.

[0055] Calculate the graft rate of the product to be 75.25%, and the molecular weight of the graft copolymer is 6.45×10 5 .

Embodiment 2

[0057] Carry out operation according to embodiment 1 step, difference is: mixed material is mixed evenly by the weight percentage of carboxymethyl starch 30%, acrylic acid 40%, initiator 1.0%, crosslinking agent 0.05% and surplus is deionized water 29.15%, Raise the temperature of the mixed material to 80°C and keep it warm for 4 hours.

[0058] Finally, the grafting rate of the product calculated was 84.30%, and the molecular weight of the grafted copolymer was 1.749×10 6 .

Embodiment 3

[0060] Carry out operation according to embodiment 1 step, difference is: mixed material is by carboxymethyl starch 35%, acrylic acid 40%, initiator 2.0%, crosslinking agent 0.1% and surplus are the weight percent of deionized water 22.90% and mix homogeneously, Raise the temperature of the mixed material to 90°C and keep it warm for 6 hours.

[0061] Calculated by formula (1), the grafting ratio of the product is 92.45%, and calculated by formula (2), the molecular weight of the graft copolymer is 2.639 × 10 6 .

[0062] 2. Selective dispersion and agglomeration of oolitic hematite:

technical field

[0001] The invention relates to sorting of hematite, in particular to a flocculant for beneficiation of oolitic hematite and a method for selectively dispersing and agglomerating the oolitic hematite. Background technique

[0002] One-ninth of my country's iron ore reserves is oolitic hematite, accounting for 30% of my country's hematite reserves. This type of oolitic hematite often forms large mines, such as the Xuanlong iron mine in the north and the Ningxiang iron mine in the south. Oolitic hematite is extremely finely distributed and often coexists or wraps with siderite, oolitic chlorite and phosphorus-containing minerals, so it is currently recognized as the most difficult type of iron ore at home and abroad. Because oolitic hematite has extremely fine particle size and its layer-by-layer wrapping structure, it is not conducive to the dissociation of ore monomers, and the ore is particularly easy to form fine particles after crushing and grinding, with...

Examples

Embodiment 1

[0053] Prepare flocculant according to the above steps, wherein:

[0054] The amount of each component in step a is 10% by weight of carboxymethyl starch, 50% of acrylic acid, 0.5% of initiator, 0.01% of crosslinking agent, and 39.49% of deionized water; in step b, the temperature of the mixed material is raised to 70 ℃, heat preservation for 3 hours; during Soxhlet extraction in step d, the weight ratio of the crude product to methanol is 2.5, the extraction time is 24 h, and finally the flocculant product is obtained.

[0055] Calculate the graft rate of the product to be 75.25%, and the molecular weight of the graft copolymer is 6.45×10 5 .

Embodiment 2

[0057] Carry out operation according to embodiment 1 step, difference is: mixed material is mixed evenly by the weight percentage of carboxymethyl starch 30%, acrylic acid 40%, initiator 1.0%, crosslinking agent 0.05% and surplus is deionized water 29.15%, Raise the temperature of the mixed material to 80°C and keep it warm for 4 hours.

[0058] Finally, the grafting rate of the product calculated was 84.30%, and the molecular weight of the grafted copolymer was 1.749×10 6 .

Embodiment 3

[0060] Carry out operation according to embodiment 1 step, difference is: mixed material is by carboxymethyl starch 35%, acrylic acid 40%, initiator 2.0%, crosslinking agent 0.1% and surplus are the weight percent of deionized water 22.90% and mix homogeneously, Raise the temperature of the mixed material to 90°C and keep it warm for 6 hours.

[0061] Calculated by formula (1), the grafting ratio of the product is 92.45%, and calculated by formula (2), the molecular weight of the graft copolymer is 2.639 × 10 6 .

[0062] 2. Selective dispersion and agglomeration of oolitic hematite: