A kind of beneficiation method of synchronous dephosphorization and sulfur of high phosphorus sulfur iron ore

A beneficiation method and iron ore technology, applied in flotation, solid separation, etc., can solve the problems of equipment corrosion, complicated process, and large dosage of chemicals, and achieve the effect of low cost, simple operation, and less dosage of chemicals

Active Publication Date: 2020-10-30
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantages of this technology can effectively remove phosphorus and sulfur impurities in siderite ore through asynchronous reverse flotation, but there are problems such as relatively complicated process, large dosage of chemicals and large pH adjustment range, which seriously corrode the equipment.

Method used

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  • A kind of beneficiation method of synchronous dephosphorization and sulfur of high phosphorus sulfur iron ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Siderite ore with 32.6% iron grade, 0.8% phosphorus and 1.0% sulfur is dephosphorized simultaneously.

[0029] (1) Grinding the high phosphorus sulfur siderite ore to -74 μm accounts for 90wt% of the ore material content, and the grinding mass concentration is 65wt%;

[0030] (2) For the grinding product of step (1), adjust slurry to pH 10 with sodium carbonate, add calcium hypochlorite 500g / t, inflate and stir for 30min;

[0031] (3) Concentrating and filtering the high-concentration pulp in step (2) to obtain filtrate and filter residue, the filtrate is returned to the previous step (1) for recycling, and the filter residue is mixed with water until the solid mass concentration is 35wt%;

[0032] (4) Add sodium hydroxide successively to the pulp in step (3), stir for 6 minutes, control the pH value of the pulp solution to be 10, starch and sodium lignosulfonate 500g / t (the molar ratio of the two is 3:1 ), stirring for 8 minutes, sodium oleate and oleic acid amide 800...

Embodiment 2

[0037] Iron grade 37.8%, phosphorus 0.7%, sulfur 0.8% red limonite ore dephosphorization sulfur simultaneously.

[0038] (1) Grinding the high-phosphorus-sulfur hematite ore to -74 μm accounts for 85wt% of the ore material content, and the grinding mass concentration is 60wt%;

[0039] (2) For the grinding product of step (1), adjust slurry to pH9 with sodium carbonate, add calcium hypochlorite 400g / t, inflate and stir for 30min;

[0040] (3) Concentrating and filtering the high-concentration pulp in step (2) to obtain filtrate and filter residue, the filtrate is returned to the previous step (1) for recycling, and the filter residue is mixed with water until the solid mass concentration is 30wt%;

[0041] (4) Add sodium hydroxide successively in the pulp in step (3), stir for 8 minutes, control the pH value of the pulp solution to be 9, starch and sodium lignosulfonate 400g / t (the molar ratio of the two is 4:1 ), stirring for 8 minutes, sodium oleate and oleic acid amide 500...

Embodiment 3

[0046] Magnetite with 42.8% iron grade, 0.8% phosphorus, and 0.6% sulfur is dephosphorized simultaneously.

[0047] (1) Grinding the high-phosphorus-sulfur magnetite to -74 μm accounts for 80wt% of the ore material, and the grinding mass concentration is 60wt%;

[0048] (2) For the grinding product of step (1), adjust slurry to pH 8.5 with sodium carbonate, add calcium hypochlorite 400g / t, inflate and stir for 20min;

[0049] (3) Concentrating and filtering the high-concentration pulp in step (2) to obtain filtrate and filter residue, the filtrate is returned to the previous step (1) for recycling, and the filter residue is mixed with water until the solid mass concentration is 25wt%;

[0050] (4) Add sodium hydroxide successively in the pulp in step (3), stir for 10min, control the pH value of the pulp solution to be 8.5, starch and sodium lignosulfonate 300g / t (the molar ratio of the two is 5:1 ), stirring for 8 minutes, sodium oleate and oleic acid amide 400g / t (the molar ...

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Abstract

The invention discloses a beneficiation method of synchronously removing phosphorus and sulfur for high phosphorus sulfur iron ore, and belongs to the technical field of beneficiation. The method comprises the following steps that high phosphorus sulfur iron ore is ground, the pH value of ore pulp is conditioned, and a surfactant calcium hypochlorite is added into the high concentration pulp system; the pulp is concentrated and filtered so as to eliminate disadvantageous influence of residual ions, after the concentration of the ore pulp is lowered, starch and sodium lignin sulfonate are addedto serve as a combined inhibitor of iron ore, a phosphorus sulfur synchronous removal reverse flotation test comprising one roughing, one scavenging and one fine selection is conducted by adopting amixed collecting agent which is prepared from an anion collecting agent sodium oleate and oleamide at a proportion. The method is low in cost and easy and convenient to operate, a calcium component cover is promoted to be formed on the surface of pyrites through sodium carbonate and calcium hypochlorite, the calcium activated particle density on the surface of the phosphorus-containing ore is increased, and synchronous removal of phosphorus and sulfur and improvement of iron grade are achieved through the mixed collecting agent with good selectivity.

Description

technical field [0001] The invention relates to the technical field of mineral processing, in particular to a mineral processing method for synchronous dephosphorization and sulfur removal of high-phosphorous pyrite iron ore. Background technique [0002] Phosphorus and sulfur are the most important harmful impurity elements in iron ore. Phosphorus in iron ore is mainly symbiotic with other minerals in the form of apatite or fluoroapatite; sulfur is mainly in the form of iron or other metal sulfides; iron components are mainly in the form of magnetite or magnetite- Exists in the form of hematite. If high phosphorus pyrite ore is directly used as raw material for ironmaking without dephosphorization and desulfurization, pig iron will not be qualified as raw material for steelmaking because of its "hot brittleness" and "cold brittleness" due to high sulfur content and high phosphorus content. At the same time, the sulfur component will inevitably cause environmental pollutio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03D1/02B03D1/016B03D101/06B03D103/04
Inventor 柏少军余攀文书明丁湛李春龙吕超
Owner KUNMING UNIV OF SCI & TECH
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