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Beneficiation method of synchronously removing phosphorus and sulfur for high phosphorus sulfur iron ore

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

Active Publication Date: 2019-05-17
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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  • Beneficiation method of synchronously removing phosphorus and sulfur for high phosphorus sulfur iron ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Simultaneous dephosphorization and sulfur removal of siderite ore with an iron grade of 32.6%, a phosphorus content of 0.8%, and a sulfur content of 1.0%.

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

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

[0031] (3) Concentrate and filter the high-concentration slurry of step (2) to obtain filtrate and filter residue. The filtrate is returned to the previous step (1) and can be recycled. The filter residue is mixed with water to adjust the solid mass concentration to 35wt%;

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

Embodiment 2

[0037] Simultaneous dephosphorization and sulfur removal of hematite with iron grade of 37.8%, phosphorus content of 0.7%, and sulfur content of 0.8%.

[0038] (1) Grind the high-phosphorus-sulfur hematite ore to -74μm with a mineral content of 85wt%, and a ground mass concentration of 60wt%;

[0039] (2) For the grinding product of step (1), adjust the sodium carbonate to pH 9, add 400 g / t of calcium hypochlorite, and aerate and stir for 30 minutes;

[0040] (3) Concentrate and filter the high-concentration slurry of step (2) to obtain filtrate and filter residue. The filtrate is returned to the previous step (1) and can be recycled. The filter residue is mixed with water to adjust the solid mass concentration to 30wt%;

[0041] (4) Add sodium hydroxide to the pulp in step (3) in turn, stir for 8 minutes, control the pH of the pulp solution to 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 50...

Embodiment 3

[0046] Simultaneous dephosphorization and sulfur removal of magnetite with iron grade of 42.8%, phosphorous content of 0.8%, and sulfur content of 0.6%.

[0047] (1) Grind the high-phosphorus-sulfur magnetite to a -74μm mineral content of 80wt%, and the grinding mass concentration is 60wt%;

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

[0049] (3) Concentrate and filter the high-concentration slurry of step (2) to obtain filtrate and filter residue. The filtrate is returned to the previous step (1) and can be recycled. The filter residue is mixed with water to adjust the solid mass concentration to 25wt%;

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

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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 beneficiation, in particular to a beneficiation method for simultaneous dephosphorization and sulfur removal of high-phosphorus pyrite ore. Background technique [0002] Phosphorus and sulfur are the most important harmful impurity elements in iron ore. The phosphorus component in iron ore is mainly in the form of apatite or fluorocarbon apatite in symbiosis with other minerals; sulfur mainly exists in the form of iron or other metal sulfides; the iron component is mainly in the form of magnetite or magnetite- It exists in the form of hematite. If high-phosphorus pyrite iron ore is directly used as raw material for ironmaking without undergoing dephosphorization and desulfurization operations, pig iron will have "hot brittleness" and "cold brittleness" due to its high sulfur and phosphorus content and cannot be used as a qualified steelmaking raw material. At the same time, the sulfur component is bound to c...

Claims

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Application Information

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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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