CN103506372A - Coal-fired furnace slag processing method - Google Patents
Coal-fired furnace slag processing method Download PDFInfo
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- CN103506372A CN103506372A CN201310433398.3A CN201310433398A CN103506372A CN 103506372 A CN103506372 A CN 103506372A CN 201310433398 A CN201310433398 A CN 201310433398A CN 103506372 A CN103506372 A CN 103506372A
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Abstract
The invention discloses a coal-fired furnace slag processing method, and belongs to the field of chemical environmental management. The processing method uses coal-fired furnace slag as a raw material to prepare white carbon black, aluminum hydroxide and ferric hydroxide. The processing method comprises the following steps: enabling crushed coal-fired furnace slag and hydrochloric acid to carry out mixed reaction; after reaction, separating solid from liquid; separating solid from liquid under the catalytic action of fluosilicic acid and sulfuric acid. The processing method effectively decomposes the coal-fired furnace slag, so that the coal-fired furnace slag is subjected to maximum reduction processing. The method utilizes elements such as Si, Al, Fe and C in the coal-fired furnace slag to produce a high value-added chemical raw material in a mode of lower cost and energy consumption. Through detection, the decomposition rate of the coal-fired furnace slag is more than 95 percent. The method has low cost and high benefits and utilizes the coal-fired furnace slag resources to produce high value-added chemical products. The processing method has low energy consumption and high rate of multipurpose utilization of by-products, does not generate waste gas, waste water and waste slag during processing, and is suitable for industrial production.
Description
Technical field
The invention belongs to chemical environment and administer field, be specifically related to a kind of processing method of coal-fired slag.
Background technology
Coal-fired slag is the burning that produces in combustion process of the coal-burning boiler mixture of ashes and the coal cinder composition of incomplete combustion completely.Its chemical composition is mainly unburned mineral in coal, and wherein the oxide of Si, Al, Fe, Ca and Mg has accounted for 90% left and right, and other main component also has K
2o, SO
3, unburned carbon and various trace elements; China is coal big country, coal utilization occupies significant proportion in AND ENERGY RESOURCES CONSUMPTION IN CHINA, surpass more than 60%, 1 ton of coal of general every burning just can produce the coal-fired slag of 0.2 ton, fertilizer industry, power industry etc. need to consume a large amount of coal, the annual coal-fired slag that produces enormous amount, coal-fired slag is one of waste residue of output maximum in China's industrial solid castoff.
On the one hand, if coal-fired slag does not add to utilize just to need to take up an area, do not stack, accumulating amount can be increasing, and it not only can cause soil pollution can also cause water and atmosphere pollution; On the other hand; in coal-fired slag, be rich in the multiple elements such as Si, A1, Fe, C, if can effectively be used, reducing coal furnace slag muck accumulated amount not only can protection of the environment; can also turn waste into wealth, produce economic benefit, be of great practical significance and far-reaching historic significance.
China is mainly to take coal-fired slag as Raw Material for Cement Production, brick to the utilization of coal-fired slag present stage, with coal-fired slag, purifies water, disposes of sewage and utilize coal-fired slag purifying smoke.These utilizations are mainly simple physical application, exist and utilize the shortcomings such as form is single, utilization rate is on the low side, benefit is not high, could not realize the due Social benefit and economic benefit of coal-fired slag.
Summary of the invention
In order to solve above-mentioned problems of the prior art, the present invention proposes a kind of integrated conduct method of coal-fired slag, this processing method is collected and is obtained calcium chloride, white carbon, aluminium hydroxide, iron hydroxide and carbon dust and reclaim main auxiliary agent Reusability.
Technical solution of the present invention comprises:
A processing method for coal-fired slag, the treating method comprises following steps:
1) first coal furnace ground-slag is broken to 100～140 orders, then fully mixes according to w/v 1:0.5～3 with hydrochloric acid, carry out stirring reaction under normal temperature or heating condition, the reaction time is 1～2 hour;
2) the coal-fired slag of step 1) and hydrochloric acid reaction carry out Separation of Solid and Liquid after completing, and obtain filtrate one and filter cake one;
3) by step 2) described filtrate one pH value be adjusted to 7, filter washing, obtain filtrate two and precipitation, described precipitation is dried and is obtained iron hydroxide and aluminium hydroxide, described filtrate two evaporates to dryness are obtained to calcium chloride dihydrate;
4) by step 2) described filter cake one dries, in filter cake one, adds successively fluosilicic acid and sulfuric acid to react, and carries out Separation of Solid and Liquid and obtain filtrate three and filter cake two after having reacted, and described filtrate three is reclaimed;
5) in filter cake described in step 4) two, add the concentrated sulfuric acid, filter cake two is 1:0.2～1 with the w/v of the concentrated sulfuric acid, heating evaporate to dryness, adding suitable quantity of water boils, filtration obtains filtrate four and filter cake three, and the pH value of described filtrate four is adjusted to 7, after washing, oven dry, obtains iron hydroxide and aluminium hydroxide;
6) in filter cake described in step 5) three, add NaOH to boil, filter, obtain filtrate five and filter cake four, described filter cake four is dried and is obtained carbon dust, the five use watery hydrochloric acid neutralizations of described filtrate make its pH value equal 7, then standing, washing, dry, pulverizing obtains white carbon.
As a preferred version of the present invention, above-mentioned steps 3) in, in filtrate one, add saturated aqua calcis to regulate, make filtrate one pH value equal 7.
As another preferred version of the present invention, above-mentioned steps 4) in, filter cake one is 1:0.2～2 with the w/v of fluosilicic acid, and filter cake one is 1:2 with the w/v of sulfuric acid, and the concentration of sulfuric acid is 10～60%.
Further, above-mentioned steps 5) in, add suitable quantity of water and boil 10 minutes.
Further, above-mentioned steps 6) in, the mass fraction of NaOH is 30%, filter cake three and NaOH w/v are 1:2～5, boil 2 hours.
The useful technique effect that the present invention brings:
The present invention proposes a kind of processing method of coal-fired slag, it utilizes hydrochloric acid that the dissolvings such as the Ca in coal-fired slag, Fe, Mg, Al are become to soluble-salt hydrochlorate, and dissolving with hydrochloric acid residue utilizes catalyst low-temperature decomposition produce calcium chloride, white carbon, aluminium hydroxide, iron hydroxide and carbon dust and reclaim main auxiliary agent Reusability at 90～150 ℃ of temperature; The coal-fired slag resolution ratio of the present invention is greater than 95% after testing, it is the method for the coal-fired slag resource of the utilization production chemical products with high added-value of a kind of low cost, high benefit, energy consumption of the present invention is low, byproduct comprehensive utilization rate is high, and in processing procedure, without waste gas, waste water, waste residue, produce, be applicable to suitability for industrialized production.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is done to further clear, complete explanation:
Fig. 1 is process chart of the present invention.
The specific embodiment
Below in conjunction with the specific embodiment, the present invention is done to further clear, complete explanation:
The present invention is raw materials used, reagent, unless stated otherwise outside, all can buy and obtain by commercial channel.
The present invention, a kind of processing method of coal-fired slag, it comprises the following steps:
Step 1: first coal furnace ground-slag is broken to 100～140 orders, then fully mixes according to w/v 1:0.5～3 with hydrochloric acid, carry out stirring reaction under normal temperature or heating condition, the reaction time is 1～2 hour;
Step 2: carry out Separation of Solid and Liquid after coal-fired slag and hydrochloric acid reaction complete, Separation of Solid and Liquid of the present invention adopts common filtration, obtains filtrate one and filter cake one after Separation of Solid and Liquid;
Step 3: the filtrate of a step 2 pH value is adjusted to 7, and the present invention preferably adds saturated aqua calcis to regulate in filtrate one, detects the pH of filtrate one when dripping aqua calcis, can stop dropping when filtrate one pH value equals 7; Then pH value is equaled to 7 filtrate one and filter washing, obtain filtrate two and precipitation, precipitation oven dry is obtained to iron hydroxide and aluminium hydroxide, filtrate two evaporates to dryness are obtained to calcium chloride dihydrate;
Step 4: the filter cake of step 2 one is dried, added successively fluosilicic acid and sulfuric acid to react in filter cake one, the preferred filter cake one of the present invention is 1:0.2～2 with the w/v of fluosilicic acid, filter cake one is 1:2 with the w/v of sulfuric acid, the concentration of sulfuric acid is 10～60%, after having reacted, carry out Separation of Solid and Liquid and obtain filtrate three and filter cake two, filtrate three is reclaimed;
Step 5: add the concentrated sulfuric acid in step 4 filter cake two, filter cake two is 1:0.2～1 with the w/v of the concentrated sulfuric acid, heating evaporate to dryness, adding suitable quantity of water boils 10 minutes, filtration obtains filtrate four and filter cake three, and the pH value of filtrate four is adjusted to 7, after washing, oven dry, obtains iron hydroxide and aluminium hydroxide;
Step 6: to adding in step 5 filter cake three NaOH to boil 2 hours, the preferred filter cake three of the present invention and NaOH w/v is 1:2～5, the mass fraction of NaOH is 30%, boil rear filtration, obtained filtrate five and filter cake four, filter cake four is dried and is obtained carbon dust, filtrate five use watery hydrochloric acid neutralizations make its pH value equal 7, then standing, washing, dry, pulverizing obtains white carbon.
Below in conjunction with specific embodiment, the present invention will be further described:
Embodiment 1:
First, coal furnace ground-slag is broken into 100 object powder, takes coal furnace ground-slag end 20g and put into beaker, in beaker, add 18% hydrochloric acid 40mL and be mixed evenly, constantly stir, react 1 hour;
After completing, above-mentioned reaction filters, obtain filtrate one and filter cake one, filtrate one drips saturated calcium hydroxide emulsion under constantly stirring, when dripping, survey the pH value of filtrate one, when pH value equals 7, stop dripping, filtrate one is filtered again, obtain filtrate two and precipitation, filtrate two dries to obtain calcium chloride product, and precipitation is dried and obtained iron hydroxide and aluminium hydroxide;
In filter cake one, add successively 10mL fluosilicic acid, 40mL sulfuric acid, react separated after 2 hours, obtain filtrate three and filter cake two, gained filtrate three is recycled, gained filter cake two adds the 10mL concentrated sulfuric acid, agitating heating evaporate to dryness, then add 50mL distilled water and boil 10 minutes, filter and obtain filtrate four and filter cake three, the pH value of filtrate four is adjusted to 7, after washing, oven dry, obtains iron hydroxide and aluminium hydroxide;
In above-mentioned filter cake three, add 50mL20% sodium hydroxide solution to boil 2 hours, again filter, obtain filtrate five and filter cake four, filter cake four is dried and is obtained carbon dust, filtrate five use watery hydrochloric acid neutralizations make its pH value equal 7, and then standing 6～12 hours of room temperature is washed, dries, pulverized and obtain white carbon.
Embodiment 2:
First, coal furnace ground-slag is broken into 120 object powder, takes coal furnace ground-slag end 20g and put into beaker, in beaker, add 10% hydrochloric acid 60mL and be mixed evenly, constantly stir, react 1 hour;
After completing, above-mentioned reaction filters, obtain filtrate one and filter cake one, filtrate one drips saturated calcium hydroxide emulsion under constantly stirring, when dripping, survey the pH value of filtrate one, when pH value equals 7, stop dripping, filtrate one is filtered again, obtain filtrate two and precipitation, filtrate two dries to obtain calcium chloride product, and precipitation is dried and obtained iron hydroxide and aluminium hydroxide;
In filter cake one, add successively 6mL fluosilicic acid, 40mL sulfuric acid, react separated after 2 hours, obtain filtrate three and filter cake two, gained filtrate three is recycled, gained filter cake two adds the 10mL concentrated sulfuric acid, agitating heating evaporate to dryness, then add 50mL distilled water and boil 10 minutes, filter and obtain filtrate four and filter cake three, the pH value of filtrate four is adjusted to 7, after washing, oven dry, obtains iron hydroxide and aluminium hydroxide;
In above-mentioned filter cake three, add the sodium hydroxide solution of 40mL30% to boil 2 hours, again filter, obtain filtrate five and filter cake four, filter cake four is dried and is obtained carbon dust, filtrate five use watery hydrochloric acid neutralizations make its pH value equal 7, and then standing 6～12 hours of room temperature is washed, dries, pulverized and obtain white carbon.
Embodiment 3:
Difference from Example 1 is: in beaker, add 10% hydrochloric acid 50mL and be mixed evenly, constantly stirring, reacting 2 hours.
Should be understood that; the above-mentioned description for embodiment is comparatively detailed; can not therefore think the restriction to scope of patent protection of the present invention; those of ordinary skill in the art is under enlightenment of the present invention; do not departing from the scope situation that the claims in the present invention protect; can also make the various deformation such as replacement, simple combination, the scope of asking for protection of the present invention should be as the criterion with claims.
Claims (5)
1. a processing method for coal-fired slag, is characterized in that: the treating method comprises following steps:
1) first coal furnace ground-slag is broken to 100～140 orders, then fully mixes according to w/v 1:0.5～3 with hydrochloric acid, carry out stirring reaction under normal temperature or heating condition, the reaction time is 1～2 hour;
2) described in step 1), coal-fired slag and hydrochloric acid reaction carry out Separation of Solid and Liquid after completing, and obtain filtrate one and filter cake one;
3) by step 2) described filtrate one pH value is adjusted to 7, filters washing, obtains filtrate two and precipitation, and described precipitation is dried and obtained iron hydroxide and aluminium hydroxide, and described filtrate two evaporates to dryness are obtained to calcium chloride dihydrate;
4) by step 2) described filter cake one dries, in filter cake one, adds successively fluosilicic acid and sulfuric acid to react, and carries out Separation of Solid and Liquid and obtain filtrate three and filter cake two after having reacted, and described filtrate three is reclaimed;
5) in filter cake described in step 4) two, add the concentrated sulfuric acid, filter cake two is 1:0.2～1 with the w/v of the concentrated sulfuric acid, heating evaporate to dryness, adding suitable quantity of water boils, filtration obtains filtrate four and filter cake three, and the pH value of described filtrate four is adjusted to 7, after washing, oven dry, obtains iron hydroxide and aluminium hydroxide;
6) in filter cake described in step 5) three, add NaOH to boil, filter, obtain filtrate five and filter cake four, described filter cake four is dried and is obtained carbon dust, the five use watery hydrochloric acid neutralizations of described filtrate make its pH value equal 7, then standing, washing, dry, pulverizing obtains white carbon.
2. the processing method of a kind of coal-fired slag according to claim 1, is characterized in that: in step 3), in described filtrate one, add saturated aqua calcis to regulate, make described filtrate one pH value equal 7.
3. the processing method of a kind of coal-fired slag according to claim 2, it is characterized in that: in step 4), described filter cake one is 1:0.2～2 with the w/v of fluosilicic acid, and described filter cake one is 1:2 with the w/v of sulfuric acid, and the concentration of described sulfuric acid is 10～60%.
4. the processing method of a kind of coal-fired slag according to claim 3, is characterized in that: in step 5), add suitable quantity of water and boil 10 minutes.
5. the processing method of a kind of coal-fired slag according to claim 4, is characterized in that: in step 6), the mass fraction of described NaOH is 30%, and described filter cake three and NaOH w/v are 1:2～5, boils 2 hours.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106140082A (en) * | 2015-05-11 | 2016-11-23 | 内蒙古工业大学 | A kind of method utilizing coal-fired slag to prepare strong adsorptivity powder body material |
| CN107043132A (en) * | 2017-04-06 | 2017-08-15 | 山东科技大学 | Building waste comprehensively utilizes new method |
| CN112499638A (en) * | 2020-11-10 | 2021-03-16 | 西安西热水务环保有限公司 | Coal-fired furnace slag comprehensive utilization treatment system and method |
| CN113857222A (en) * | 2021-10-27 | 2021-12-31 | 太原科技大学 | Harmless treatment method for red mud |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106185975A (en) * | 2016-07-22 | 2016-12-07 | 山东钢铁股份有限公司 | A kind of method utilizing blast furnace slag to prepare molecular sieve crystal |
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| CN1036799A (en) * | 1989-02-20 | 1989-11-01 | 重庆市硅酸盐研究所 | The method of decomposing making chemical products from blast-furnace slags with hydrochloric acid |
| AU1646295A (en) * | 1994-04-14 | 1995-10-26 | Pasminco Australia Limited | A process for converting waste materials from secondary lead processing plants into environmentally acceptable materials |
| CN101306928A (en) * | 2008-06-20 | 2008-11-19 | 北京世纪地和科技有限公司 | Pre- desiliconizing method from fly ash or slag |
| CN102676831A (en) * | 2012-05-02 | 2012-09-19 | 唐翔 | Process for recycling ferrochromium smelting slag comprehensively |
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2013
- 2013-09-18 CN CN201310433398.3A patent/CN103506372B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1036799A (en) * | 1989-02-20 | 1989-11-01 | 重庆市硅酸盐研究所 | The method of decomposing making chemical products from blast-furnace slags with hydrochloric acid |
| AU1646295A (en) * | 1994-04-14 | 1995-10-26 | Pasminco Australia Limited | A process for converting waste materials from secondary lead processing plants into environmentally acceptable materials |
| CN101306928A (en) * | 2008-06-20 | 2008-11-19 | 北京世纪地和科技有限公司 | Pre- desiliconizing method from fly ash or slag |
| CN102676831A (en) * | 2012-05-02 | 2012-09-19 | 唐翔 | Process for recycling ferrochromium smelting slag comprehensively |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106140082A (en) * | 2015-05-11 | 2016-11-23 | 内蒙古工业大学 | A kind of method utilizing coal-fired slag to prepare strong adsorptivity powder body material |
| CN106140082B (en) * | 2015-05-11 | 2020-06-26 | 内蒙古工业大学 | Method for preparing strong-adsorbability powder material by utilizing coal-fired furnace slag |
| CN107043132A (en) * | 2017-04-06 | 2017-08-15 | 山东科技大学 | Building waste comprehensively utilizes new method |
| CN107043132B (en) * | 2017-04-06 | 2019-04-05 | 山东科技大学 | Building waste method of comprehensive utilization |
| CN112499638A (en) * | 2020-11-10 | 2021-03-16 | 西安西热水务环保有限公司 | Coal-fired furnace slag comprehensive utilization treatment system and method |
| CN113857222A (en) * | 2021-10-27 | 2021-12-31 | 太原科技大学 | Harmless treatment method for red mud |
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