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Medium and low grade phosphorus ore magnesium removal treatment method

A treatment method, low-grade technology, applied in the direction of phosphate material treatment, etc., to achieve the effect of reducing emissions, avoiding emissions, and avoiding pollution

Active Publication Date: 2015-08-26
贵州盛源新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no literature report on the combined pretreatment of nitric acid and ammonium nitrate in the pretreatment process of magnesium removal of medium and low grade phosphate rock, which provides a new idea for the pretreatment of magnesium removal of medium and low grade phosphorus rock

Method used

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  • Medium and low grade phosphorus ore magnesium removal treatment method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0031] like figure 1 Shown, a kind of process method for removing magnesium of middle and low grade phosphate rock, comprises the following steps:

[0032] (1) Calcination and digestion: the medium and low-grade phosphate rocks are calcined in a calcination furnace at a temperature of 900°C for 0.5h, and then digested with 45ml of water per 100g of phosphate rocks; the water digestion process is carried out with hot water Digestive processing. The temperature of the hot water was 60°C.

[0033] (2) Leaching: the digested slurry is placed in the leaching tank, and the ammonium nitrate solution and the nitric acid solution of 65% are added into the leaching tank with a concentration of 25%, and the temperature in the leaching tank is controlled at 80 ℃, and the material in the leaching tank was stirred for 50 minutes; the amount of the ammonium nitrate solution added was 300ml per 100g of phosphate rock. The addition amount of described nitric acid solution is to add 5g accor...

Embodiment 2

[0038] like figure 1 Shown, a kind of process method for removing magnesium of middle and low grade phosphate rock, comprises the following steps:

[0039] (1) Calcination and digestion: In the low-grade phosphate rock calciner, the temperature of 950°C is used for 1.5h, and then 55ml of water is used for every 100g of phosphate rock; the water digestion is carried out with hot water. deal with. The temperature of the hot water was 70°C.

[0040] (2) Leaching: the phosphate ore that has been digested is placed in the leaching tank, and in the leaching tank, adding a concentration of 50% ammonium nitrate solution and a 90% nitric acid solution to the leaching tank The temperature is controlled at 90°C, and the material in the leaching tank is stirred for 80 minutes; the amount of the ammonium nitrate solution added is 400ml per 100g of phosphate rock. The addition amount of described nitric acid solution is to add 5g according to every 100g phosphate rock.

[0041] (3) Abso...

Embodiment 3

[0045] Such as figure 1 Shown, a kind of process method for removing magnesium of middle and low grade phosphate rock, comprises the following steps:

[0046] (1) Calcination and digestion: in the low-grade phosphate rock calciner, the temperature of 910 ℃ is used for calcination for 0.7h, and then 50ml of water is used for every 100g of phosphate rock for digestion; the water digestion is carried out with hot water deal with. The temperature of the hot water was 65°C.

[0047] (2) Leaching: the phosphate ore that has been digested and processed is placed in the leaching tank, and in the leaching tank, adding a concentration of 10% ammonium nitrate solution and a 5% nitric acid solution to the leaching tank The temperature is controlled at 85°C, and the material in the leaching tank is stirred for 30 minutes; the amount of the ammonium nitrate solution added is 350ml per 100g of phosphate rock. The addition amount of described nitric acid solution is to add 70g according to...

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Abstract

The invention relates to the technical field of medium and low grade phosphorus ore pretreatment, particularly to a medium and low grade phosphorus ore magnesium removal treatment method. A magnesium element in a phosphorus ore is converted into an oxide from carbonate after steps of calcining digestion, leaching, absorption, separation and ammonium carbonate treatment, the ionic state is presented in a solution to enable the magnesium element to be separated out, and the treatment is performed on obtained filtrate to enable nitrate in the filtrate to be recycled; absorption and utilization are performed on the waste gas produced in the calcining process and the ammonia gas produced in the leaching process to obtain ammonium carbonate; the ammonium carbonate is reacted in the filtrate to obtain an ammonium nitrate solution and magnesium contained calcium carbonate, the ammonium nitrate solution is returned to the leaching step, and accordingly the discharge of the waste liquid is avoided, the magnesium contained calcium carbonate additional product is obtained, and the additional process value is increased.

Description

technical field [0001] The invention relates to the technical field of pretreatment of middle and low-grade phosphate rocks, in particular to a method for removing magnesium from middle and low-grade phosphate rocks. Background technique [0002] my country's phosphate rock reserves rank second in the world, but about 80% of the reserves are medium and low-grade phosphate rocks, most of which are difficult-to-select middle and low-grade collophosphine, with fine mineral particles and tightly embedded distribution, and relatively high impurities such as associated magnesium. High, it will reduce the grade of phosphate ore, increase the consumption of sulfuric acid during wet treatment of phosphate ore, and affect the process of phosphoric acid and phosphate deep processing and the quality of products. Traditionally, medium and low-grade phosphate rocks have been beneficiated to reduce the content of impurities such as magnesium in the phosphate rocks, and then undergo further ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/01
Inventor 张钦顾春光卢玉莲张澜曦韩瑜张富强文焱炳张仁秀
Owner 贵州盛源新材料股份有限公司
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