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Process for preparing high-quality industrial salt by utilizing garbage fly ash

A waste fly ash, high-quality technology, applied in the shape preparation of alkali metal halides, alkali metal chlorides, alkali metal halide purification, etc., can solve the problems of difficult separation of potassium and sodium, and heavy metals are easy to exceed the standard, so as to reduce production costs , Reduce the number of washing stages and reduce equipment maintenance costs

Pending Publication Date: 2019-03-12
杭州秀澈环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems that the heavy metals in the industrial salt produced by fly ash are easy to exceed the standard, and potassium and sodium are not easy to separate, and provide a process for preparing high-quality industrial salt by using garbage fly ash, which can effectively separate potassium and sodium in an industrialized method , which can ensure that the heavy metal content of salt produced from waste fly ash from different sources is within the national standard requirements, and the quality of industrial salt produced is stable

Method used

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  • Process for preparing high-quality industrial salt by utilizing garbage fly ash
  • Process for preparing high-quality industrial salt by utilizing garbage fly ash
  • Process for preparing high-quality industrial salt by utilizing garbage fly ash

Examples

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Effect test

Embodiment 1

[0040] A process for preparing high-quality industrial salt from garbage fly ash ( figure 1 ), including the steps of washing fly ash, removing heavy metals, decolorizing, decalcifying, evaporative crystallization and separating potassium and sodium, as follows:

[0041] The washing of the fly ash is a three-level countercurrent washing, including the first level of water washing, the second level of water washing and the third level of water washing;

[0042] After the first stage of water washing, solid-liquid separation is carried out. After the solid is crushed, it enters the second stage of water washing, and the liquid enters the step of removing heavy metals. The mass ratio of fly ash to water in the first stage of water washing is 1:1;

[0043] After the second stage of washing, solid-liquid separation is carried out, and the solid is crushed and then enters the third stage of water washing, and the liquid is used as the water source of the first stage of water washing...

Embodiment 2

[0047] A process for preparing high-quality industrial salt from garbage fly ash ( figure 2 ), including the steps of washing fly ash, removing heavy metals, decolorizing, decalcifying, evaporative crystallization and separating potassium and sodium, as follows:

[0048] Before the fly ash washing step, the fly ash is wet-grinded, and the slurry formed after the wet grinding enters the fly ash washing step;

[0049] The washing of the fly ash is a three-level countercurrent washing, including the first level of water washing, the second level of water washing and the third level of water washing;

[0050] After the first stage of water washing, solid-liquid separation is carried out. After the solid is crushed, it enters the second stage of water washing, and the liquid enters the heavy metal removal step. The water consumption of the first stage of water washing + the water consumption of fly ash wet grinding and the mass ratio of fly ash = 1 :1, that is, the mass ratio of ...

Embodiment 3

[0055] A process for preparing high-quality industrial salt from garbage fly ash ( image 3 ), including the steps of washing fly ash, removing heavy metals, decolorizing, decalcifying, evaporative crystallization and separating potassium and sodium, as follows:

[0056] The washing of the fly ash is a three-level countercurrent washing, including the first level of water washing, the second level of water washing and the third level of water washing;

[0057] After the first stage of water washing, solid-liquid separation is carried out. After the solid is crushed, it enters the second stage of water washing, and the liquid enters the step of removing heavy metals. The water consumption of the first stage of water washing and the mass ratio of fly ash = 1:1;

[0058] After the second stage of washing, solid-liquid separation is carried out. The mass ratio of fly ash to water in the second stage of water washing is 1: 1. After the solid is crushed, it enters the third stage of...

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Abstract

The invention discloses a process for preparing high-quality industrial salt by utilizing garbage fly ash. The process comprises the steps of washing the fly ash with water, removing heavy metals, decolorizing, removing calcium, carrying out evaporative crystallization and performing potassium-sodium separation; during the evaporative crystallization, when the mother liquor density reaches 1.15-1.25g / cm<3>, primary centrifugal separation is carried out, sodium chloride obtained by the primary centrifugal separation is collected, and liquid obtained by the primary centrifugal separation is cooled and crystallized; after cooling and crystallizing are finished, secondary centrifugal separation is carried out; the liquid obtained by the secondary centrifugal separation re-enters the step of removing the heavy metals, and the solid obtained by the secondary centrifugal separation is refined by using a saturated potassium chloride solution as a refining washing liquid; after refining is finished, third centrifugal separation is carried out; potassium chloride obtained by the third centrifugal separation is collected. The process provided by the invention can effectively separate potassium and sodium by using an industrial method, and can enable the content of heavy metals produced by the garbage fly ash from different sources to be in line with the requirements of the national standard; the quality of the produced industrial salt is stable.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a process for preparing high-quality industrial salt by utilizing garbage fly ash. Background technique [0002] With the rapid development of urbanization, the output of domestic waste in my country has increased year by year, from 189 million in 2013 to 206 million tons in 2015. The proportion of incineration disposal is increasing year by year. Fly ash is an inevitable product of waste incineration, accounting for about 3-5% of the amount of waste incinerated. According to this calculation, the fly ash produced by waste incineration nationwide will be 10,000-20,000 tons / day in the future. Such a large amount of fly ash is generated, making how to safely and effectively dispose of incineration fly ash has become an urgent environmental and social problem to be solved. [0003] Fly ash is the fine particulate matter collected in the flue gas purification syste...

Claims

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Application Information

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IPC IPC(8): C01D3/04C01D3/24C01D3/14C01D3/16
CPCC01D3/04C01D3/14C01D3/16C01D3/24
Inventor 丁仲军朱晓青韩逸沈忱肖云锋钟建华
Owner 杭州秀澈环保科技有限公司
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