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Composite modified starch as hematite reverse flotation inhibitor and preparation method thereof

A compound modified starch and reverse flotation technology, which is applied in flotation, solid separation, etc., can solve the problems of cooking operation and pipeline transportation, reduce the use effect of anionic starch, and difficulty in filtering iron concentrate, etc., so as to avoid the cooking process, Solve the effect of clogged pipes and low viscosity

Inactive Publication Date: 2012-05-09
GUANGXI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, when using anionic starches such as sulfonate or carboxylate as inhibitors, there are still the following problems: (1) The viscosity of starch is high, which makes cooking operations and pipeline transportation difficult; (2) The flotation system contains some calcium, manganese, Heterocations such as iron have a certain "neutralization" effect on the anions in the starch, which reduces the use effect of the anionic starch; (3) With the increasing degree of fine grinding of iron ore, and the high viscosity of the pulp itself , the difficulty of iron concentrate filtration is still difficult to solve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 100 parts of tapioca starch, 0.5 parts of sodium hypochlorite, 1.2 parts of sodium sulfite, 0.2 parts of sodium nitrite, 0.5 parts of 3-chloro-2-hydroxypropyl trimethyl quaternary ammonium salt, 25 parts of water, 3 parts of sodium hydroxide, add and mix Stir and mix for 1 hour, control the temperature at the front stage of extrusion and puffing to 50°C, the temperature at the middle stage to 130°C, and the temperature at the end stage to 190°C, feed the above uniformly mixed materials into the extruder and extrude at a screw speed of 250 r / min React for 2 minutes.

[0027] The carboxyl (-COOH) mass percentage of the product obtained in this example is 0.01%, the mass percentage of sulfur (S) is 0.25%, the mass percentage of nitrogen (N) is 0.026%, and the viscosity is 22mPa·s (6%, 95°C ), cold water soluble compound modified starch products. This product is used as a hematite inhibitor in the addition amount of 0.8kg / t, and for the hematite with an iron grade of ...

Embodiment 2

[0029] Take 100 parts of cornstarch, 3.0 parts of sodium hypochlorite, 5.5 parts of sodium sulfite, 1.0 part of sodium nitrite, 0.8 part of 3-chloro-2-hydroxypropyl trimethyl quaternary ammonium salt, 25 parts of water, 6 parts of potassium hydroxide, and mix Mix in the machine for 2 hours, control the temperature of the front stage of extrusion and puffing to 70°C, the temperature of the middle stage to 155°C, and the temperature of the end stage to 220°C, feed the above uniformly mixed materials into the extruder and extrude at a screw speed of 125 r / min 5 minutes.

[0030] The carboxyl group (-COOH) mass percentage of the product obtained in this embodiment is 0.024%, the mass percentage of sulfur (S) is 0.91%, and the mass percentage of nitrogen (N) is 0.052%. , viscosity of 13mPa·s (6%, 95 ℃), cold water soluble complex modified starch products. This product is used as a hematite inhibitor in the addition amount of 0.8kg / t, and for the hematite with an iron grade of 43.5...

Embodiment 3

[0032] Take 100 parts of tapioca starch, 10 parts of sodium hypochlorite, 7.0 parts of sodium sulfite, 1.2 parts of sodium nitrite, 3.5 parts of 3-chloro-2-hydroxypropyl trimethyl quaternary ammonium salt, 40 parts of water, 3.5 parts of sodium hydroxide, add and mix Stir and mix for 3 hours, control the temperature of the front section of extrusion and puffing to 80°C, the temperature of the middle section to 170°C, and the temperature of the end section to 240°C, feed the above uniformly mixed materials into the extruder and extrude at a screw speed of 50 r / min React for 10 minutes.

[0033] The carboxyl (-COOH) mass percentage of the product obtained in this example is 0.17%, the mass percentage of sulfur (S) is 1.35%, the mass percentage of nitrogen (N) is 0.175%, and the viscosity is 8 mPa·s (6%, 95 ℃), cold water soluble compound modified starch products. This product is used as a hematite inhibitor in the addition amount of 0.8kg / t, and for the hematite with an iron gr...

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Abstract

The invention discloses composite modified starch as a hematite reverse flotation inhibitor and a preparation method thereof. The composite modified starch comprises 100 weight portions of raw material starch, 0.5-10 weight portions of sodium hypochlorite as an oxidizing agent, 1.2-7.0 weight portions of sodium hydrosulphite, 0.2-1.2 weight portions of sodium nitrite as esterification reagents, 0.5-3.5 weight portions of 3-chloro-2-hydroxypropyl-trimethyl quaternary ammonium salt as a cationic reagent, 3.0-7.0 weight portions of caustic alkali, and 25-40 weight portions of water. The composite modified starch contains carboxylic groups, sulfonic anions, and quaternary ammonium cations, and has the advantages of cold water solubility and low viscosity, and has the advantages of increasing the yield of hematite concentrate, improving the filtering conditions of iron ore pulp, and the like.

Description

technical field [0001] The invention belongs to the technical field of reverse flotation agent preparation in mineral processing engineering, and in particular relates to hematite reverse flotation inhibitor compound modified starch and a preparation method thereof. Background technique [0002] Hematite is an oxidized ore formed under oxidative conditions. It mainly occurs in sedimentary, weathered forest filter, and some metamorphic sedimentary, volcanic-intrusion related iron ores. my country's hematite reserves have been proven to account for about 18.1% of the country's total iron ore reserves, with the characteristics of poor, miscellaneous, fine, and high proportion of associated ore. According to statistics, the average grade of hematite iron ore in my country is 31.27%. Compared with imported ores from Australia and Brazil, there is still a significant gap in the quality of iron ore concentrates in my country. For example, Australia is mostly hematite-rich ore, wit...

Claims

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Application Information

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IPC IPC(8): C08B31/18C08B31/16B03D1/016B03D101/06
Inventor 张友全谢新玲刘洁玉琼广梁露峰刘绍秀
Owner GUANGXI UNIV
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