CN103506372B - Coal-fired furnace slag processing method - Google Patents
Coal-fired furnace slag processing method Download PDFInfo
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- CN103506372B CN103506372B CN201310433398.3A CN201310433398A CN103506372B CN 103506372 B CN103506372 B CN 103506372B CN 201310433398 A CN201310433398 A CN 201310433398A CN 103506372 B CN103506372 B CN 103506372B
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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 mixture that the coal cinder of the burning that produces in combustion of coal-burning boiler ashes and incomplete combustion completely forms.Its chemical composition is mainly unburned mineral in coal, and wherein the oxide of Si, Al, Fe, Ca and Mg about account for about 90%, 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, more than more than 60%, the general 1 ton of coal that often burns 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 coal-fired slag of annual generation enormous amount, coal-fired slag is one of waste residue that in China's industrial solid castoff, output is maximum.
On the one hand, if coal-fired slag does not add to utilize just need take up an area stacking, accumulating amount can be increasing, and it not only can cause soil pollution can also cause water and atmosphere pollution; On the other hand; be rich in the multiple elements such as Si, A1, Fe, C in coal-fired slag, 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's present stage to the utilization of coal-fired slag mainly with coal-fired slag be Raw Material for Cement Production, brick, purify water, dispose of sewage and utilize coal-fired slag purifying smoke with coal-fired slag.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, under normal temperature or heating condition, carry out stirring reaction, 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 oven dry is obtained iron hydroxide and aluminium hydroxide, described filtrate two evaporate to dryness is obtained calcium chloride dihydrate;
4) by step 2) described filter cake one dries, in filter cake one, add fluosilicic acid successively and sulfuric acid reacts, and carry out Separation of Solid and Liquid after having reacted and obtain filtrate three and filter cake two, 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, add suitable quantity of water to boil, filtration obtains filtrate four and filter cake three, and the pH value of described filtrate four is adjusted to 7, obtains iron hydroxide and aluminium hydroxide after washing, oven dry;
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, described filtrate five with watery hydrochloric acid neutralization make its pH value equal 7, then leave standstill, washing, dry, pulverize obtain white carbon.
As a preferred version of the present invention, above-mentioned steps 3) in, add saturated aqua calcis in filtrate one and 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%, and filter cake three and NaOH w/v are 1:2 ~ 5, boil 2 hours.
The Advantageous Effects 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 Ca, Fe, Mg, the Al in coal-fired slag are become 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 temperature 90 ~ 150 DEG C; The coal-fired slag resolution ratio of the present invention is greater than 95% after testing, it is a kind of method of utilization coal-fired slag resource production chemical products with high added-value of low cost, high benefit, energy consumption of the present invention is low, byproduct comprehensive utilization rate is high, and produce without waste gas, waste water, waste residue in processing procedure, be applicable to suitability for industrialized production.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, explanation clear, complete is further done to the present invention:
Fig. 1 is present invention process flow chart.
Detailed description of the invention
Below in conjunction with detailed description of the invention, explanation clear, complete is further done to the present invention:
The present invention is raw materials used, reagent, unless stated otherwise, all buys by commercial channel and obtains.
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, under normal temperature or heating condition, carry out stirring reaction, and 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: filtrate one pH value of step 2 is adjusted to 7, the present invention preferably adds saturated aqua calcis and regulates in filtrate one, detects the pH of filtrate one while dripping aqua calcis, can stop dripping when filtrate one pH value equals 7; Then the filtrate one pH value being equaled 7 carries out filtration washing, obtains filtrate two and precipitation, precipitation oven dry is obtained iron hydroxide and aluminium hydroxide, filtrate two evaporate to dryness is obtained calcium chloride dihydrate;
Step 4: the filter cake one of step 2 is dried, adds fluosilicic acid successively and sulfuric acid reacts 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%, carry out Separation of Solid and Liquid after having reacted 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, add suitable quantity of water and boil 10 minutes, filtration obtains filtrate four and filter cake three, and the pH value of filtrate four is adjusted to 7, obtains iron hydroxide and aluminium hydroxide after washing, oven dry;
Step 6: add in step 5 filter cake three NaOH boil 2 hours, the preferred filter cake three of the present invention and NaOH w/v be 1:2 ~ 5, the mass fraction of NaOH is 30%, boil rear filtration, obtain filtrate five and filter cake four, filter cake four is dried and is obtained carbon dust, filtrate five with watery hydrochloric acid neutralization make its pH value equal 7, then leave standstill, washing, dry, pulverize obtain 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 the hydrochloric acid 40mL of 18% and be mixed evenly, constantly stirring, reacting 1 hour;
Filter after above-mentioned reaction completes, obtain filtrate one and filter cake one, filtrate one drips saturated calcium hydroxide emulsion under constantly stirring, while 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 oven dry is obtained iron hydroxide and aluminium hydroxide;
10mL fluosilicic acid is added successively in filter cake one, 40mL sulfuric acid, react after 2 hours and be separated, 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;
Add 50mL20% sodium hydroxide solution in above-mentioned filter cake three and boil 2 hours, again filter, obtain filtrate five and filter cake four, filter cake four is dried and is obtained carbon dust, filtrate five makes its pH value equal 7 with watery hydrochloric acid neutralization, and room temperature leaves standstill 6 ~ 12 hours, then washes, dries, pulverizes and namely 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 the hydrochloric acid 60mL of 10% and be mixed evenly, constantly stirring, reacting 1 hour;
Filter after above-mentioned reaction completes, obtain filtrate one and filter cake one, filtrate one drips saturated calcium hydroxide emulsion under constantly stirring, while 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 oven dry is obtained iron hydroxide and aluminium hydroxide;
6mL fluosilicic acid is added successively in filter cake one, 40mL sulfuric acid, react after 2 hours and be separated, 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;
The sodium hydroxide solution adding 40mL30% in above-mentioned filter cake three boils 2 hours, again filters, and obtains filtrate five and filter cake four, filter cake four is dried and is obtained carbon dust, filtrate five makes its pH value equal 7 with watery hydrochloric acid neutralization, and room temperature leaves standstill 6 ~ 12 hours, then washes, dries, pulverizes and namely obtain white carbon.
Embodiment 3:
Difference from Example 1 is: in beaker, add the hydrochloric acid 50mL of 10% and be mixed evenly, constantly stirring, and reacts 2 hours.
Should be understood that; the above-mentioned description for embodiment is comparatively detailed; therefore the restriction to scope of patent protection of the present invention can not be thought; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that the claims in the present invention protect; can also make the various deformation such as replacement, simple combination, request protection domain 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 1:2 with hydrochloric acid, under normal temperature or heating condition, carry out stirring reaction, the reaction time is 1 ~ 2 hour;
2) step 1) described coal-fired slag and hydrochloric acid reaction carry out Separation of Solid and Liquid after completing, and obtains filtrate one and filter cake one;
3) by step 2) described filtrate one pH value is adjusted to 7, filters washing, and obtain filtrate two and precipitation, described precipitation oven dry is obtained iron hydroxide and aluminium hydroxide, described filtrate two evaporate to dryness is obtained calcium chloride dihydrate;
4) by step 2) described filter cake one dries, in filter cake one, add fluosilicic acid successively and sulfuric acid reacts, and carry out Separation of Solid and Liquid after having reacted and obtain filtrate three and filter cake two, described filtrate three is reclaimed;
5) to step 4) add the concentrated sulfuric acid in described filter cake two, filter cake two is 1:0.2 ~ 1 with the w/v of the concentrated sulfuric acid, heating evaporate to dryness, add suitable quantity of water to boil, filtration obtains filtrate four and filter cake three, the pH value of described filtrate four is adjusted to 7, after washing, oven dry, obtains iron hydroxide and aluminium hydroxide;
6) to step 5) add NaOH in described filter cake three and boil, filter, obtain filtrate five and filter cake four, described filter cake four is dried and is obtained carbon dust, described filtrate five with watery hydrochloric acid neutralization make its pH value equal 7, then leave standstill, washing, dry, pulverize obtain white carbon.
2. the processing method of a kind of coal-fired slag according to claim 1, is characterized in that: step 3) in, add saturated aqua calcis in described filtrate one and 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: step 4) in, 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: step 5) in, 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: step 6) in, the mass fraction of described NaOH is 30%, and described filter cake three and NaOH w/v are 1:2 ~ 5, boil 2 hours.
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| CN201310433398.3A CN103506372B (en) | 2013-09-18 | 2013-09-18 | Coal-fired furnace slag processing method |
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Cited By (2)
| 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 |
| 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 |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (4)
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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 (3)
| 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 |
| 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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