Method for producing low-iron limestone

A production method and limestone technology, applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., can solve the problems of low production efficiency, complicated procedures, and high processing cost, and achieve improved production efficiency, accelerated reaction speed, and excellent quality. Effect

Active Publication Date: 2013-12-11

GUANGXI SHILIN MINING IND SCI & TECH CO LTD

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Problems solved by technology

[0004] The purpose of the present invention is to provide a production method of low-iron limestone, which can overcome the problems of complex procedures, low production efficiency, and high processing cost of existing processing methods, and make ordinary limestone become ultra-low-iron limestone...

Abstract

The invention discloses a method for producing low-iron limestone. The method comprises the following operation steps: weighing the following raw materials in parts by weight: 80-120 parts of hydrochloric acid with the weight percentage of 10-20%, 80-150 parts of acetic acid with the weight percentage of 25-35% and 0-20 parts of phosphorus trichloride with the weight percentage of 5-15%; uniformly mixing the raw materials so as to obtain a mixture A; mixing the mixture A with water according to a weight ratio of 1:(50-200); uniformly stirring so as to obtain a mixture B; heating limestone powder to the temperature of 70-90 DEG C in a thermostat; feeding the limestone powder into the upper layer of a stirring box; mixing the limestone powder with the mixture B according to a weight ratio of 1:(2-4); stirring for 1-3 minutes; feeding into the stirring box middle layer provided with a screening net at the bottom; filtering; feeding a filtered solution into the lower layer of the stirring box; drying the limestone powder. By utilizing the method, a limestone raw material of which the iron content is less than or equal to 50ppm can be prepared, the production efficiency is high, the treatment cost is low, a treatment method is environment-friendly, and the environment is not polluted.

Application Domain

Calcium/strontium/barium oxides/hydroxides

Technology Topic

ChemistryTreatment costs +7

Examples

Experimental program(4)

Example Embodiment

[0029] Example 1

[0030] A production method of low-iron limestone includes the following steps:

[0031] 1. Crush the limestone mineral, pass through a 16-mesh sieve, and then pass the 12000GS permanent magnet rod to obtain limestone powder;

[0032] 2. Weigh the raw materials according to the following parts by weight: 120 kg of 20% hydrochloric acid by weight, 150 kg of 35% by weight acetic acid, and 20 kg of 15% by weight phosphorus trichloride. Mix well to obtain mixture A;

[0033] 3. Mix mixture A and water at a weight ratio of 1:200, stir evenly to obtain mixture B;

[0034] 4. The limestone powder is heated to a temperature of 90℃ under the thermostat, the limestone powder is put into the upper layer of the mixing box, the mineral powder and the mixture B are mixed according to the weight ratio of 1:4, stirred for 3 minutes, and put into the bottom of the screen. In the middle layer of the box, the filtered solution is placed in the lower layer of the stirring box, and the mineral powder is placed on the conveyor belt and dried;

[0035] 5. Place activated carbon in the lower layer of the stirring box, and filter the compound produced by the adsorption reaction and the limestone powder that passes through the screen. The filtrate is added with hydrochloric acid, acetic acid or phosphorus trichloride depending on the concentration for recycling.

[0036] Using the above method, the content of iron, aluminum, chromium and magnesium metal elements in limestone minerals has been reduced from 450ppm, 820ppm, 150ppm, 750ppm to 40ppm, 250ppm, 20ppm, 220ppm, respectively. The calcium oxide content is 62.1%, and the calcium carbonate is 99.0%. The quality requirements of the raw materials used in high-quality glass.

Example Embodiment

[0037] Example 2

[0038] A production method of low-iron limestone includes the following steps:

[0039] 1. Crush the limestone, pass through a 10-mesh sieve, and then pass through a 10000GS permanent magnet rod to obtain limestone powder;

[0040] 2. Weigh the raw materials in the following parts by weight: 100 kg of 15% by weight hydrochloric acid, 120 kg of 30% by weight of acetic acid, and 12 kg of 8% by weight of phosphorus trichloride, and mix them to obtain mixture A;

[0041] 3. Mix mixture A and water at a weight ratio of 1:100, stir evenly to obtain mixture B;

[0042] 4. Heat the limestone powder to a temperature of 80℃ under the thermostat, put the limestone powder into the upper layer of the mixing box, mix the mineral powder and the mixture B according to the weight ratio of 1:3, stir for 2 minutes, and put it into the bottom of the screen to stir In the middle layer of the box, the filtered solution is placed in the lower layer of the stirring box, and the mineral powder is placed on the conveyor belt and dried.

[0043] Using the above method, the content of iron, aluminum, chromium and magnesium in limestone minerals has been reduced from 390ppm, 700ppm, 180ppm, and 650ppm to 45ppm, 250ppm, 25ppm, and 250ppm, respectively. The calcium oxide content is 62.1% and calcium carbonate is 99.0%. The quality requirements of the raw materials used in high-quality glass.

Example Embodiment

[0044] Example 3

[0045] A production method of low-iron limestone includes the following steps:

[0046] 1. Crush the limestone, pass through an 8-mesh sieve, and then pass through a 1000GS permanent magnet drum to obtain limestone powder;

[0047] 2. Weigh the raw materials according to the following parts by weight: 85 kg of 12% by weight hydrochloric acid, 95 kg of 28% by weight of acetic acid, and mix well to obtain mixture A;

[0048] 3. Mix mixture A and water at a weight ratio of 1:80, stir evenly to obtain mixture B;

[0049] 4. The limestone powder is heated to a temperature of 75℃ under the thermostat, the limestone powder is put into the upper layer of the mixing box, the mineral powder and the mixture B are mixed according to the weight ratio of 1:3.5, and the mixture is stirred for 2 minutes, and then placed in the bottom of the screen. In the middle layer of the box, the filtered solution is placed in the lower layer of the stirring box, and the mineral powder is placed on the conveyor belt and dried;

[0050] 5. Place activated carbon in the lower layer of the stirring box to absorb the compounds produced by the reaction and the limestone powder that passes through the screen, and filter, and add hydrochloric acid and acetic acid to the filtrate depending on the concentration for recycling.

[0051] Using the above method, the content of iron, aluminum, chromium and magnesium in limestone minerals has been reduced from 400ppm, 610ppm, 225ppm, and 380ppm to 45ppm, 320ppm, 34ppm, 150ppm, respectively. The calcium oxide content is 60.2%, and calcium carbonate is 99.8%. The quality requirements of the raw materials used in high-quality glass.

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Method for producing low-iron limestone

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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