CN-121988586-A - Recycling regeneration and cyclic utilization method of high-activity calcium hydroxide desulfurization ash

CN121988586ACN 121988586 ACN121988586 ACN 121988586ACN-121988586-A

Abstract

The invention belongs to the technical field of resource recycling, and provides a recycling method for recycling high-activity calcium hydroxide desulfurization ash, which comprises the following steps: the method comprises the steps of carrying out granularity division detection on calcium carbonate after solid-liquid separation, marking a calcium carbonate detection sample through granularity detection, analyzing the number and granularity deviation of unqualified detection samples after marking, analyzing granularity uniformity among qualified detection samples, judging solid-liquid separation quality, constructing a solid-liquid separation curve through obtaining rotation speeds and solid-liquid separation values of a centrifugal machine in a plurality of historical solid-liquid separation operations, carrying out change analysis to obtain a centrifugal correlation value, judging whether the rotation speed of the centrifugal machine influences the solid-liquid separation quality or not, if so, obtaining an optimal rotation speed value, carrying out solid-liquid separation again, facilitating the optimization operation of subsequent solid-liquid separation, and improving the recycling and recycling efficiency of calcium hydroxide desulfurization ash.

Inventors

SHAO YUN
NAN XIAOYAN

Assignees

中晟天成(山东)环境科技有限公司

Dates

Publication Date: 20260508
Application Date: 20241106

Claims (10)

1. The recycling method of the high-activity calcium hydroxide desulfurization ash is characterized by comprising the following steps of adding desulfurization ash and water into a 1-liter three-neck flask according to the ratio of the desulfurization ash to the water of 1:2-3, stirring into slurry, and heating to 50-60 ℃ to obtain desulfurization ash slurry; Adding the desulfurization ash conversion agent into the desulfurization ash slurry according to the ratio of the desulfurization ash to the desulfurization ash conversion agent of 1:0.55-0.7, and introducing carbon dioxide and air for conversion to obtain slurry after desulfurization ash conversion; filtering the slurry after the desulfurization ash conversion by a centrifugal machine to separate solid from liquid, wherein the solid is calcium carbonate and the liquid is ammonium sulfate solution; The method comprises the steps of obtaining solid-liquid separated calcium carbonate solids, dividing the solid-liquid separated calcium carbonate solids into a plurality of equal weight calcium carbonate solid detection samples, obtaining solid data of the calcium carbonate solid detection samples, marking the calcium carbonate solid detection samples based on analysis of the solid data, analyzing the marked calcium carbonate solid detection samples to obtain solid-liquid separation values, comparing the solid-liquid separation values with a solid-liquid separation threshold, and generating separation disqualification signals if the solid-liquid separation values are larger than the solid-liquid separation threshold; Acquiring rotational speed data of the centrifugal machine in a plurality of historical solid-liquid separation operations based on the separation disqualification signals, constructing a solid-liquid separation curve based on the rotational speed data and the solid-liquid separation values, processing and analyzing to obtain a centrifugal correlation value based on the solid-liquid separation curve, judging whether the rotational speed of the centrifugal machine can influence the solid-liquid separation quality based on the centrifugal correlation value, and if so, generating an influence signal; based on the influence signal, acquiring a centrifugal limit value, returning the solution of the ammonium sulfate obtained after solid-liquid separation to the third step for solid-liquid separation again based on the centrifugal limit value, executing the fourth step after separation, and executing the fifth step for calcining the calcium carbonate solid obtained by solid-liquid separation again and the calcium carbonate solid detection sample; evaporating, concentrating and crystallizing the ammonium sulfate solution, and filtering to obtain an ammonium sulfate product; Calcining solid calcium carbonate at 1100 ℃ to generate calcium oxide; Step six, adding water and a digestion agent into calcium oxide according to the proportion of 1:0.33 and the proportion of 1:0.1 to carry out digestion reaction, and generating high-activity calcium hydroxide after the reaction.
2. The recycling method for recycling the high-activity calcium hydroxide desulfurization ash according to claim 1 is characterized in that the process for marking the calcium carbonate solid detection sample comprises the following steps: Acquiring solid data of a calcium carbonate solid detection sample, wherein the solid data comprises a granularity value; Comparing the particle size value of the calcium carbonate solid detection sample with a preset particle size value; If the particle size value of the calcium carbonate solid detection sample is smaller than or equal to the preset particle size value, marking the calcium carbonate solid detection sample as a qualified detection sample; If the particle size value of the calcium carbonate solid detection sample is larger than the preset particle size value, marking the calcium carbonate solid detection sample as a disqualified detection sample.
3. The recycling method for recycling the high-activity calcium hydroxide desulfurization ash according to claim 2 is characterized in that the solid-liquid separation value is obtained by the following steps: Based on the unqualified detection sample, processing and analyzing to obtain an unqualified sample value HG and an unqualified degree value CD, and based on the qualified detection sample, processing and analyzing to obtain a variance value FC of the qualified granularity data set; And carrying out data processing on the obtained disqualified sample value HG, the disqualified degree value CD and the variance value FC, and adopting the formula: and obtaining a solid-liquid separation value GF, wherein s1 and s2 are preset proportionality coefficients.
4. The recycling method for recycling the high-activity calcium hydroxide desulfurization ash according to claim 3, wherein the method for obtaining the disqualified sample value HG is as follows: Based on the unqualified detection samples, counting the number of the unqualified detection samples, carrying out ratio processing on the number of the unqualified detection samples and the total number of the calcium carbonate solid detection samples to obtain an unqualified sample value, and marking the unqualified sample value as HG.
5. The recycling method for recycling the high-activity calcium hydroxide desulfurization ash according to claim 3, wherein the method for obtaining the disqualification value CD is as follows: Based on the unqualified detection samples, acquiring the granularity values of the unqualified detection samples, carrying out difference processing on the granularity values and the preset granularity values, taking the absolute value of the difference values to obtain granularity deviation of the unqualified detection samples, summing the granularity differences of all the unqualified detection samples to obtain a mean value of the granularity differences, carrying out ratio processing on the mean value of the granularity differences and the preset granularity values to obtain an unqualified degree value, and marking the unqualified degree value as DC.
6. The method for recycling high-activity calcium hydroxide desulfurization ash according to claim 3, wherein the variance value FC of the qualified granularity data set is obtained by integrating the granularity values of all qualified detection samples into the qualified granularity data set and performing variance calculation.
7. The recycling method for recycling the high-activity calcium hydroxide desulfurization ash according to claim 1 is characterized in that the centrifugal correlation value is obtained by the following steps: Acquiring rotational speed data of the centrifugal machine in a plurality of historical solid-liquid separation operations, wherein the rotational speed data comprises rotational speed values, the rotational speed values of the centrifugal machine in the historical solid-liquid separation operations are taken as X axes, the solid-liquid separation values corresponding to the centrifugal machine in the historical solid-liquid separation operations are taken as Y axes, an X-Y coordinate system is constructed, and the solid-liquid separation values corresponding to the centrifugal machine in the historical solid-liquid separation operations are marked and connected in the X-Y coordinate system to obtain a solid-liquid separation curve; Processing and analyzing the solid-liquid separation curve to obtain a variance value XC of the target quantity ratio MB and the slope data set; And carrying out data processing on the obtained target quantity ratio MB and the variance value XC of the slope data set, and obtaining a centrifugal correlation value GL through a formula GL=a1, MB+a2 and XC -1 , wherein a1 and a2 are preset proportionality coefficients.
8. The recycling method for recycling the high-activity calcium hydroxide desulfurization ash according to claim 7 is characterized in that the target quantity ratio MB is obtained by the following steps: dividing a solid-liquid separation curve into a plurality of separation sub-curves, obtaining slope values of the separation sub-curves, and comparing the slope values of the separation sub-curves with 0; If the slope value of the separation sub-curve is smaller than 0, marking the separation sub-curve as a target sub-curve; And counting the number of the target sub-curves, carrying out ratio processing on the number of the target sub-curves and the total number of the separation sub-curves to obtain a target number ratio, and marking the target number ratio as MB.
9. The method for recycling high-activity calcium hydroxide desulfurization ash according to claim 7, wherein the variance value XC of the slope data set is obtained by integrating slope values of all target sub-curves into the slope data set and performing variance calculation.
10. The recycling method for recycling the high-activity calcium hydroxide desulfurization ash according to claim 1 is characterized in that the centrifugal limit value is obtained by the following steps: And in a coordinate system where the solid-liquid separation curve is located, constructing a straight line parallel to the X axis by taking the solid-liquid separation threshold value as a reference value, marking the straight line as a reference line, acquiring an intersection point between the reference line and the solid-liquid separation curve, and acquiring a rotating speed value corresponding to the intersection point on the X axis as a centrifugal limit value.

Description

Recycling regeneration and cyclic utilization method of high-activity calcium hydroxide desulfurization ash Technical Field The invention belongs to the technical field of resource recycling, and particularly relates to a recycling method for recycling high-activity calcium hydroxide desulfurization ash. Background The high-activity calcium hydroxide desulfurization ash can be used as a cement mixing material, but can affect the cement performance, and has great cost and small mixing amount. So far, no effective treatment method or full utilization method is available, so that serious resource waste and environmental pollution are caused, and therefore, research on a recycling method of high-activity calcium hydroxide desulfurization ash has important significance. In the prior art, the lack of regenerating calcium in the desulfurization ash into high-activity calcium hydroxide to be reused in a desulfurization system as a desulfurizing agent, sulfate radicals and sulfite radicals in the desulfurization ash are converted into ammonium sulfate products, so that resource waste and environmental pollution are caused, and in the recycling of the high-activity calcium hydroxide desulfurization ash, the lack of quality detection and analysis of influencing factors on solid-liquid separation cannot provide an optimization basis for subsequent recycling and improve the recycling efficiency of the high-activity calcium hydroxide desulfurization ash. Therefore, the invention provides a recycling method for recycling high-activity calcium hydroxide desulfurization ash. Disclosure of Invention In order to overcome the deficiencies of the prior art, at least one technical problem presented in the background art is solved. The technical scheme adopted for solving the technical problems is that the recycling method of the high-activity calcium hydroxide desulfurization ash comprises the steps of adding desulfurization ash and water into a1 liter three-neck flask according to the ratio of the desulfurization ash to the water of 1:2-3, stirring into slurry and heating to 50-60 ℃ to obtain desulfurization ash slurry; Adding the desulfurization ash conversion agent into the desulfurization ash slurry according to the ratio of the desulfurization ash to the desulfurization ash conversion agent of 1:0.55-0.7, and introducing carbon dioxide and air for conversion to obtain slurry after desulfurization ash conversion; filtering the slurry after the desulfurization ash conversion by a centrifugal machine to separate solid from liquid, wherein the solid is calcium carbonate and the liquid is ammonium sulfate solution; The method comprises the steps of obtaining solid-liquid separated calcium carbonate solids, dividing the solid-liquid separated calcium carbonate solids into a plurality of equal weight calcium carbonate solid detection samples, obtaining solid data of the calcium carbonate solid detection samples, marking the calcium carbonate solid detection samples based on analysis of the solid data, analyzing the marked calcium carbonate solid detection samples to obtain solid-liquid separation values, comparing the solid-liquid separation values with a solid-liquid separation threshold, and generating separation disqualification signals if the solid-liquid separation values are larger than the solid-liquid separation threshold; Acquiring rotational speed data of the centrifugal machine in a plurality of historical solid-liquid separation operations based on the separation disqualification signals, constructing a solid-liquid separation curve based on the rotational speed data and the solid-liquid separation values, processing and analyzing to obtain a centrifugal correlation value based on the solid-liquid separation curve, judging whether the rotational speed of the centrifugal machine can influence the solid-liquid separation quality based on the centrifugal correlation value, and if so, generating an influence signal; based on the influence signal, acquiring a centrifugal limit value, returning the solution of the ammonium sulfate obtained after solid-liquid separation to the third step for solid-liquid separation again based on the centrifugal limit value, executing the fourth step after separation, and executing the fifth step for calcining the calcium carbonate solid obtained by solid-liquid separation again and the calcium carbonate solid detection sample; evaporating, concentrating and crystallizing the ammonium sulfate solution, and filtering to obtain an ammonium sulfate product; Calcining solid calcium carbonate at 1100 ℃ to generate calcium oxide; Step six, adding water and a digestion agent into calcium oxide according to the proportion of 1:0.33 and the proportion of 1:0.1 to carry out digestion reaction, and generating high-activity calcium hydroxide after the reaction. The invention further adopts the technical scheme that the process for marking the calcium carbonate solid detection sample comprises the followi