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Process for treating fly ash by adopting purified waste acid

A technology for waste acid treatment and fly ash, which is applied in the direction of protection devices against harmful chemicals, etc., and can solve the problems of combined treatment of waste acid and fly ash

Inactive Publication Date: 2020-12-18
BEIJING BBMG BEISHUI ENVIROMENTAL TECH CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, there is no technology for combining waste acid and fly ash in the prior art, so further research is needed

Method used

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  • Process for treating fly ash by adopting purified waste acid
  • Process for treating fly ash by adopting purified waste acid
  • Process for treating fly ash by adopting purified waste acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] This embodiment provides a process for treating fly ash with waste acid after purification, including the following steps:

[0105] (1) Mix fly ash and water according to the weight ratio of 1:2.8, stir for 30min under the condition of 100r / min, and get the slurry after stirring evenly;

[0106] (2) Adopt diffusion dialysis membrane technology to purify waste sulfuric acid, waste sulfuric acid is added in the slurry gained in step (1) with the flow rate of 300L / h after purification, wherein waste sulfuric acid accounts for 7wt.% of fly ash weight, fully reacts, get the reaction solution;

[0107] (3) The reaction solution obtained in step (2) was subjected to suction filtration for 5 minutes to obtain a filter cake and a filtrate.

Embodiment 2

[0109] This embodiment provides a process for treating fly ash with waste acid after purification, including the following steps:

[0110] (1) Mix the fly ash and water according to the weight ratio of 1:3.2, stir for 40min under the condition of 120r / min, and get the slurry after stirring evenly;

[0111] (2) Adopt diffusion dialysis membrane technology to purify waste sulfuric acid, waste sulfuric acid is added in the slurry gained in step (1) with the flow rate of 350L / h after purification, wherein waste sulfuric acid accounts for 8wt.% of fly ash weight, fully reacts, get the reaction solution;

[0112] (3) The reaction solution obtained in step (2) was subjected to suction filtration for 6 minutes to obtain a filter cake and a filtrate.

Embodiment 3

[0114]This embodiment provides a process for treating fly ash with waste acid after purification, including the following steps:

[0115] (1) Mix the fly ash and water according to the weight ratio of 1:3, stir for 35min under the condition of 110r / min, and get the slurry after stirring evenly;

[0116] (2) Use diffusion dialysis membrane technology to purify waste sulfuric acid, add waste sulfuric acid in the slurry obtained in step (1) with the flow rate of 325L / h after purification, wherein waste sulfuric acid accounts for 7.5wt.% of fly ash weight, fully react , get the reaction liquid;

[0117] (3) Suction filter the reaction liquid obtained in step (2) for 5.5 min to obtain a filter cake and a filtrate.

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Abstract

The invention relates to a process for treating fly ash by adopting purified waste acid. The process comprises the following steps: (1) mixing fly ash with water, and uniformly stirring to obtain slurry; (2) adding the purified waste acid into the slurry obtained in the step (1), and fully reacting to obtain a reaction solution; and (3) filtering the reaction solution obtained in the step (2) to obtain a filter cake and a filtrate. The purified waste acid is applied to a fly ash production line, the addition amount of acid is controlled, the pilot plant test effect is good, and multiple effects of absorbing the waste acid and improving heavy metals in crystalline salt are achieved. The technical combination of waste acid and hazardous waste fly ash is realized, comprehensive saving and cyclic utilization of resources are promoted, environmental and safety problems caused by stockpiling of high-concentration waste acid and fly ash are reduced, and national policy orientation and socialdevelopment requirements are completely met.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a process for treating fly ash with purified waste acid. Background technique [0002] Sulfuric acid is the most active binary inorganic strong acid, which can react with most metals. High-concentration sulfuric acid has strong water absorption and can be used as a dehydrating agent to carbonize carbohydrate-containing substances such as wood, paper, cotton and linen fabrics, and biological flesh. When mixed with water, it will release a lot of heat energy. It is strongly corrosive and oxidizing. Sulfuric acid is one of the important basic chemical raw materials with a wide range of uses. It can be used to manufacture fertilizers, medicines, explosives, pigments, detergents, batteries, etc. It is also widely used in industries such as purification of petroleum, metal smelting, and dyes. It is often used as a chemical reagent, and can be used as a dehydrating...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/36A62D101/08A62D101/43
CPCA62D3/36A62D2101/08A62D2101/43
Inventor 张万柏沈莹赵宏飞曹向东杨晶秦二兰位百勇张大龙熊大伟黄岚马名烽
Owner BEIJING BBMG BEISHUI ENVIROMENTAL TECH CO LTD
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