阅读说明：本技术 一种石硫合剂的制备方法 (Preparation method of lime sulphur mixture ) 是由 季玉玄 汪毅 秦晓东 赵倩倩 杨洋 于 2019-10-30 设计创作，主要内容包括：本发明涉及一种石硫合剂的制备方法,其包括如下步骤：S1、将飞灰与水混合,配制成飞灰浆,并加热至沸腾,备用；S2、将硫磺粉加水调成糊状,加入催化剂,混匀后,倒入步骤S1中得到的飞灰浆中,混匀后,加热至沸腾后,得到红棕色溶液和墨绿色沉淀物；S3、分离收集所述红棕色溶液,进行波美度测定；其中,所述飞灰由城市生活垃圾焚烧得到。与现有技术相比,本发明具有如下的有益效果：1、利用城市生活垃圾焚烧飞灰作为制备石硫合剂的原料,替代石灰,降低成本,同时实现飞灰资源化利用；2、飞灰中存在的大量锌盐,为反应提供活化剂,无需添加额外活化剂,节约成本。(The invention relates to a preparation method of lime sulphur, which comprises the following steps: s1, mixing the fly ash with water to prepare fly ash slurry, and heating the fly ash slurry to boiling for later use; s2, adding water into sulfur powder to form a paste, adding a catalyst, uniformly mixing, pouring into the fly ash slurry obtained in the step S1, uniformly mixing, and heating to boil to obtain a reddish brown solution and a greenish black precipitate; s3, separating and collecting the reddish brown solution, and performing baume degree determination; wherein the fly ash is obtained by burning municipal solid waste. Compared with the prior art, the invention has the following beneficial effects: 1. the fly ash from the incineration of the municipal solid waste is used as a raw material for preparing the lime-sulfur mixture, so that the cost is reduced, and the fly ash is recycled; 2. a large amount of zinc salt in the fly ash provides an activator for the reaction, and an additional activator is not needed to be added, so that the cost is saved.)

1. The preparation method of the lime sulphur is characterized by comprising the following steps:

s1, mixing the fly ash with water to prepare fly ash slurry, and heating the fly ash slurry to boiling for later use;

s2, adding water into sulfur powder to form a paste, adding sodium dithiocarbamate, mixing uniformly, pouring into the fly ash slurry obtained in the step S1, mixing uniformly, and heating to boil to obtain a reddish brown solution and a greenish black precipitate;

s3, separating and collecting the reddish brown solution, and performing baume degree determination;

wherein the fly ash is obtained by burning municipal solid waste.

2. A method for preparing a lime sulphur agent according to claim 1, wherein the mass ratio of the fly ash, sulphur powder and water is 10: (2-5) 25-100, the mass ratio of the sulfur powder to the catalyst is 1 (0.05-0.1).

3. A method of producing a lime sulphur agent according to claim 1 or 2, wherein the sulphur powder is premium sulphur powder.

4. A process for the preparation of lime sulphur as claimed in claim 1, wherein the loss of water due to evaporation is made up by adding hot water.

5. A method of producing a lime sulphur admixture as claimed in claim 1, wherein the method of incinerating municipal solid waste is inclined reciprocating grate incineration.

6. The preparation method of the lime sulphur is characterized by comprising the following steps:

s1, mixing the fly ash with water to prepare fly ash slurry, and heating the fly ash slurry to boiling for later use;

s2, adding water into sulfur powder to form a paste, adding zinc dithiocarbamate, mixing uniformly, pouring into the fly ash slurry obtained in the step S1, mixing uniformly, and heating to boil to obtain a reddish brown solution and a greenish black precipitate;

s3, separating and collecting the reddish brown solution, and performing baume degree determination;

wherein the fly ash is obtained by burning municipal solid waste.

7. A method for preparing lime sulphur according to claim 6, wherein the mass ratio of fly ash, sulphur powder and water is 10: (2-5) 25-100, the mass ratio of the sulfur powder to the catalyst is 1 (0.05-0.1).

8. A process for the preparation of a lime sulphur agent according to claim 6 or 7, wherein the sulphur powder is premium sulphur powder.

9. A process for the preparation of lime sulphur as claimed in claim 6, wherein the loss of water due to evaporation is made up by adding hot water.

10. A method for preparing a lime sulphur agent as claimed in claim 6, wherein the method of incinerating municipal solid waste is inclined reciprocating grate incineration.

11. The preparation method of the lime sulphur is characterized by comprising the following steps:

s1, mixing the fly ash with water to prepare fly ash slurry, and heating the fly ash slurry to boiling for later use;

s2, adding water into sulfur powder to form paste, adding zinc dithiocarbamate and sodium dithiocarbamate, mixing uniformly, pouring into the fly ash slurry obtained in the step S1, mixing uniformly, and heating to boil to obtain a reddish brown solution and a greenish black precipitate;

s3, separating and collecting the reddish brown solution, and performing baume degree determination;

wherein the fly ash is obtained by burning municipal solid waste.

12. A method of producing lime sulphur according to claim 11, wherein the mass ratio of fly ash, sulphur powder and water is 10: (2-5) 25-100, the mass ratio of the sulfur powder to the catalyst is 1 (0.05-0.1).

13. A method of producing a lime sulphur agent according to claim 11 or 12, wherein the sulphur powder is premium sulphur powder.

14. A process for the preparation of a lime sulphur agent according to claim 11, wherein the loss of water due to evaporation is made up by adding hot water.

15. A method of producing a lime sulphur agent as claimed in claim 11, wherein the method of incinerating municipal solid waste is inclined reciprocating grate incineration.

16. A method of preparing a lime sulphur agent according to claim 11, wherein the weight ratio of sodium dithiocarbamate to zinc dithiocarbamate is 1: (2-5).

Technical Field

The invention relates to the technical field of chemical industry/environmental protection, in particular to a method for preparing lime sulphur by using incineration fly ash of municipal solid waste.

Background

The lime sulphur mixture is a reddish brown liquid inorganic sulphur preparation, can sterilize and kill pests, can prevent and treat various plant diseases and insect pests, has the advantages of good effect, low price, no residue and the like, and is widely used. Meanwhile, in the aspect of precious metal extraction, gold and silver can be efficiently recovered, and in the aspect of environmental protection, the main component of the catalyst is calcium polysulfide, so that the catalyst has strong reducibility and can be used as a reducing agent for treating hexavalent chromium.

The fly ash from incineration of municipal solid waste (hereinafter referred to as "fly ash") is classified as hazardous waste due to its high content of heavy metals and dioxins, and its main components are CaO and SiO₂、Al₂O₃And Fe₂O₃The CaO content is relatively high, generally above about 20%. In addition, it contains main elements such As K, Na, Cl, Mg, Ti, etc., and trace heavy metal elements such As Pb, Cr, Cu, Zn, Hg, Ni, As, etc. The fly ash components are also greatly different due to different raw materials and incineration modes. According to the physicochemical properties of the fly ash, the water-washed fly ash is used for partially replacing a cement raw material at present and is used as an effective way for recycling the fly ash.

Disclosure of Invention

The invention aims to provide a method for preparing lime sulphur by using municipal solid waste incineration fly ash, which takes the fly ash as a raw material and finds a fly ash resource utilization way. Meanwhile, the fly ash has high zinc salt content, can provide an activating agent for reaction, improves the reaction efficiency and improves the quality of the lime sulphur mixture stock solution. In addition, in the reaction process, the enrichment of heavy metal elements is realized, and the possibility is provided for the subsequent extraction and reutilization of heavy metals.

The invention provides a method for preparing lime sulphur mixture by using fly ash from incineration of municipal solid waste, which also belongs to the field of chemical industry/environmental protection technology. The lime-based lime-lime-lime composite lime hydrate has the same effect, and can be used for treating hexavalent chromium in solid waste to achieve the purpose of treating waste by waste.

In order to achieve the purpose, the invention adopts the following technical scheme:

a preparation method of lime sulphur comprises the following steps:

s1, mixing the fly ash with water to prepare fly ash slurry, and heating the fly ash slurry to boiling for later use;

s2, adding water into sulfur powder to form a paste, adding sodium dithiocarbamate, mixing uniformly, pouring into the fly ash slurry obtained in the step S1, mixing uniformly, and heating to boil to obtain a reddish brown solution and a greenish black precipitate;

s3, separating and collecting the reddish brown solution, and performing baume degree determination;

wherein the fly ash is obtained by burning municipal solid waste.

Preferably, the mass ratio of the fly ash to the sulfur powder to the water is 10: (2-5) 25-100, the mass ratio of the sulfur powder to the catalyst is 1 (0.05-0.1).

Preferably, the sulfur powder is top-grade sulfur powder.

Preferably, the loss of water due to evaporation is made up by adding hot water.

Preferably, the incineration method of the municipal solid waste is inclined reciprocating thrust grate incineration.

A preparation method of lime sulphur comprises the following steps:

s1, mixing the fly ash with water to prepare fly ash slurry, and heating the fly ash slurry to boiling for later use;

s2, adding water into sulfur powder to form a paste, adding zinc dithiocarbamate, mixing uniformly, pouring into the fly ash slurry obtained in the step S1, mixing uniformly, and heating to boil to obtain a reddish brown solution and a greenish black precipitate;

s3, separating and collecting the reddish brown solution, and performing baume degree determination according to the simple method for determining the concentration of the lime sulphur agent in the Chenyulin, wherein the concentration of 20-30 baume degrees is good lime sulphur agent stock solution, and the effect is poor when the baume degree is lower than 20 baume degrees;

wherein the fly ash is obtained by burning municipal solid waste.

Preferably, the mass ratio of the fly ash to the sulfur powder to the water is 10: (2-5) 25-100, the mass ratio of the sulfur powder to the catalyst is 1 (0.05-0.1).

As a preferable scheme, the sulfur powder is superior sulfur powder, and the superior sulfur powder should meet the technical index of superior products in the sulfur powder for rubber (HG/T4558-2013).

Preferably, the loss of water due to evaporation is made up by adding hot water.

Preferably, the incineration method of the municipal solid waste is inclined reciprocating thrust grate incineration.

A preparation method of lime sulphur comprises the following steps:

s1, mixing the fly ash with water to prepare fly ash slurry, and heating the fly ash slurry to boiling for later use;

s2, adding water into sulfur powder to form paste, adding zinc dithiocarbamate and sodium dithiocarbamate, mixing uniformly, pouring into the fly ash slurry obtained in the step S1, mixing uniformly, and heating to boil to obtain a reddish brown solution and a greenish black precipitate;

s3, separating and collecting the reddish brown solution, and performing baume degree determination;

wherein the fly ash is obtained by burning municipal solid waste.

Preferably, the mass ratio of the fly ash to the sulfur powder to the water is 10: (2-5) 25-100, the mass ratio of the sulfur powder to the catalyst is 1 (0.05-0.1).

Preferably, the sulfur powder is top-grade sulfur powder.

Preferably, the loss of water due to evaporation is made up by adding hot water.

Preferably, the incineration method of the municipal solid waste is inclined reciprocating thrust grate incineration.

Preferably, the weight ratio of the sodium dithiocarbamate to the zinc dithiocarbamate is 1: (2 to 5)

A preparation method of lime sulphur comprises the following steps:

s1, mixing the fly ash with water to prepare fly ash slurry, and heating the fly ash slurry to boiling for later use;

s2, adding water into sulfur powder to form a paste, adding a catalyst, uniformly mixing, pouring into the fly ash slurry obtained in the step S1, uniformly mixing, and heating to boil to obtain a reddish brown solution and a greenish black precipitate;

s3, separating and collecting the reddish brown solution, and performing baume degree determination;

wherein the fly ash is obtained by burning municipal solid waste.

Preferably, the mass ratio of the fly ash to the sulfur powder to the water is 10: (2-5) 25-100, the mass ratio of the sulfur powder to the catalyst is 1 (0.05-0.1).

Preferably, the sulfur powder is top-grade sulfur powder.

Preferably, the catalyst is a dithiocarbamate compound.

Preferably, the catalyst is selected from one or two of sodium dithiocarbamate and zinc dithiocarbamate.

Preferably, the loss of water due to evaporation is made up by adding hot water.

Preferably, the incineration method of the municipal solid waste is inclined reciprocating thrust grate incineration.

Compared with the prior art, the invention has the following beneficial effects:

1. the fly ash from the incineration of the municipal solid waste is used as a raw material for preparing the lime-sulfur mixture, so that the cost is reduced, and the fly ash is recycled;

2. a large amount of zinc salt in the fly ash provides an activator for the reaction, and an additional activator is not needed to be added, so that the cost is saved;

3. a large amount of heavy metals are enriched in the waste residues after the reaction, so that the possibility is provided for the subsequent extraction and reutilization of the heavy metals;

4. the catalyst is selected from thiocarbamate which is one or a mixture of heavy metal stabilizers, not only is used as the catalyst, but also can form chelate sediment with heavy metal.

5. Has the same effect as lime to prepare lime-sulfur mixture and obvious reduction and solidification effect on hexavalent chromium.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.