CN110627106A - Method for producing zinc carbonate by using blast furnace cloth bag ash dechlorination wastewater - Google Patents
Method for producing zinc carbonate by using blast furnace cloth bag ash dechlorination wastewater Download PDFInfo
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- CN110627106A CN110627106A CN201910776853.7A CN201910776853A CN110627106A CN 110627106 A CN110627106 A CN 110627106A CN 201910776853 A CN201910776853 A CN 201910776853A CN 110627106 A CN110627106 A CN 110627106A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/14—Purification
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G9/00—Compounds of zinc
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Abstract
A method for producing zinc carbonate by using blast furnace cloth bag ash dechlorination wastewater. The method comprises six steps, wherein slurry is obtained in the first step, solid-liquid separation is carried out on the slurry obtained in the first step in the second step to obtain filtrate A and filter residue, the PH value of the filtrate A is 5.8-6.2, the filtrate A is returned to the first step to replace clear water in the third step, the processes of the first step and the second step are repeated until the zinc content in the obtained filtrate A reaches more than 10g/l and the PH value is 5.8-6.2 to obtain filtrate B, potassium carbonate is added into the filtrate B in the fourth step to generate white precipitate until the PH value in the filtrate is 7-7.5, stirring is carried out for 2-3 hours to obtain turbid liquid, solid-liquid separation is carried out in the fifth step, and when the concentration of potassium chloride in the filtrate C reaches more than 100g/l, heavy metals and impurities in the filtrate C are removed, evaporation crystallization is carried out to obtain a potassium chloride product. The invention is used for producing zinc carbonate by using the dechlorination waste water of the blast furnace cloth bag ash.
Description
Technical Field
The invention relates to a method for producing zinc carbonate by using blast furnace cloth bag ash dechlorination wastewater.
Background
The blast furnace bag dust is dust collected by a bag-type dust collector along with raw material dust carried by blast furnace gas and particles generated by violent reaction in a high-temperature region in the blast furnace smelting process. In recent years, more and more iron and steel enterprises adopt a rotary hearth furnace process to recover zinc in blast furnace cloth bag ash. As the chloride ion content in the blast furnace cloth bag ash is higher, about 3 percent, the blast furnace cloth bag ash needs to be washed by water for dechlorination and then enters the rotary hearth furnace so as to prevent the chloride ion from corroding the rotary hearth furnace system. However, most of zinc in the blast furnace cloth bag ash exists in the form of zinc oxide, about 10% -20% of zinc exists in the form of zinc chloride, and in the process of washing the blast furnace cloth bag ash, part of soluble zinc chloride is dissolved in liquid, and if the part of zinc is not treated, on one hand, the water treatment in the subsequent water treatment process is not up to standard, and on the other hand, the waste of zinc resources is caused.
In the technical aspect of comprehensive utilization of blast furnace cloth bag ash, some wet zinc extraction processes are too complex, and acidic or alkaline substances are added during production of zinc products, so that difficulty is increased in the subsequent water treatment process. When relevant patent documents are inquired, no case of producing zinc carbonate by using blast furnace bag ash is found, and only data similar to that of producing zinc carbonate by using other zinc-containing materials are searched.
The application number is 201710907907.X, the Chinese invention patent with the invention name of 'recycling method of zinc in galvanized waste steel and zinc-containing materials' discloses: the method is characterized by comprising the following steps: (1) acid washing: putting galvanized waste steel and iron and steel and a zinc-containing material into a reaction tank, and adding dilute hydrochloric acid into the reaction tank for acid washing to obtain a mixed solution A containing iron ions and zinc ions and the waste steel and iron; (2) oxidizing and removing impurities: adding hydrogen peroxide into the mixed solution A for oxidation, adding strong base to adjust the pH of the solution to 4.5, and obtaining a solid-liquid mixture containing precipitates; (3) deep oxidation and impurity removal: repeating the operation in the step (2) until the solution is colorless and transparent, and obtaining a solid-liquid mixture containing the precipitated zinc ions with the pH value of 4.5; filtering out the precipitate for later use to obtain a mixed solution B containing zinc ions; (4) separation: adding a sodium carbonate or sodium hydroxide solution into the mixed solution B, adjusting the pH of the solution to 6, and separating out zinc carbonate or zinc hydroxide to obtain a solution containing sodium chloride; (5) drying: and (3) drying the zinc carbonate or the zinc hydroxide in the step (4) for 1-3h at the temperature of 100-. The disadvantages of this patent are: after acid washing and oxidation impurity removal, dilute hydrochloric acid and sodium hydroxide are added, the steps are complicated, and the cost is high.
The invention has application number of 201711208334.8, and is a Chinese patent of 'a method for preparing zinc carbonate by using zinc leaching residue', and discloses: the method is characterized by comprising the following steps: the method comprises the following steps: slurrying the zinc leaching residues with water, wherein the mass liquid-solid ratio is 3-4:1, adding hydrogen peroxide with the mass of 1-10% of that of the zinc leaching residues, stirring for 2h, and filtering to obtain filtrate A and filter residues B; step two: pulping and washing the filter residue B with water, wherein the mass liquid-solid ratio is 3-4:1 during pulping, washing for 0.5h, and filtering to obtain a filtrate C and a filter residue D, wherein the filtrate C is returned to the step one and used as pulping water of zinc leaching residues; step three: adjusting the pH value of the filtrate A to 3-4 by using sodium hydroxide, stirring for 0.5-1h, and filtering to obtain filtrate E and filter residue F; step four: and continuously adding ammonium bicarbonate into the filtrate E to stabilize the pH value to 8-9, continuously stirring to perform precipitation reaction for 1H, and filtering to obtain filtrate G and a product H, wherein the product H is zinc carbonate. The disadvantages of this patent are: the PH of the zinc leaching residue liquid is too low, hydrogen peroxide and sodium hydroxide are added, the pH is oxidized and adjusted, most of zinc in the filtrate exists in the form of zinc sulfate, and the zinc leaching residue liquid is not suitable for the filtrate of blast furnace bag ash.
Disclosure of Invention
The invention aims to provide a method for producing zinc carbonate by using dechlorination waste water of blast furnace sack ash, which adopts a simple and feasible process to recover zinc in the dechlorination waste water of the blast furnace sack ash and prepare zinc carbonate with higher grade.
The above purpose is realized by the following technical scheme:
a method for producing zinc carbonate by using dechlorination waste water of blast furnace cloth bag ash comprises six steps, wherein slurry is obtained in the first step, solid-liquid separation is carried out on the slurry obtained in the first step in the second step to obtain filtrate A and filter residue, the PH value of the filtrate A is 5.8-6.2, the filtrate A is returned to the first step to replace clear water in the third step, the processes of the first step and the second step are repeated until the zinc content in the obtained filtrate A reaches more than 10g/l, and the PH value is 5.8-6.2, to obtain filtrate B, adding potassium carbonate into the filtrate B to generate white precipitate until the pH value of the filtrate is 7-7.5, and simultaneously stirring for 2-3 hours to obtain a turbid solution, carrying out solid-liquid separation in the fifth step, and carrying out evaporative crystallization on the filtrate C after heavy metals and impurities are removed when the concentration of potassium chloride in the filtrate C reaches more than 100g/l in the sixth step to obtain a potassium chloride product.
The method for producing zinc carbonate by using dechlorination wastewater of blast furnace cloth bag ash comprises the following steps of firstly, adding the blast furnace cloth bag ash into clean water, wherein the weight ratio of the blast furnace cloth bag ash to the clean water is 1: 3-1: and 4, stirring the mixture for 2 to 3 hours at the same time to obtain slurry.
And the fifth step of solid-liquid separation is to carry out solid-liquid separation on the turbid liquid obtained in the fourth step to obtain filter residue A and filtrate C, wherein the zinc content in the filtrate C is less than 0.5g/l, the filtrate C returns to the first step to replace clear water, the first step and the second step are repeated, and the filter residue A is dried to obtain a zinc carbonate product with the grade of more than 50%.
Advantageous effects
1. The method has simple process flow, does not change other properties of the liquid, and can obtain high-grade products with the recovery rate of zinc in the liquid reaching more than 99 percent.
The method has simple process steps, can improve the recovery rate of zinc in the dechlorination waste water of the blast furnace cloth bag ash to more than 99 percent, and the grade of the obtained product zinc carbonate is more than 50 percent, and the waste water after the zinc removal is used for producing potassium chloride, thereby realizing the comprehensive utilization of zinc.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example 1
A method for producing zinc carbonate by using dechlorination waste water of blast furnace cloth bag ash comprises six steps, wherein slurry is obtained in the first step, solid-liquid separation is carried out on the slurry obtained in the first step in the second step to obtain filtrate A and filter residue, the PH value of the filtrate A is 5.8-6.2, the filtrate A is returned to the first step to replace clear water in the third step, the processes of the first step and the second step are repeated until the zinc content in the obtained filtrate A reaches more than 10g/l, and the PH value is 5.8-6.2, to obtain filtrate B, adding potassium carbonate into the filtrate B to generate white precipitate until the pH value of the filtrate is 7-7.5, and simultaneously stirring for 2-3 hours to obtain a turbid solution, carrying out solid-liquid separation in the fifth step, and carrying out evaporative crystallization on the filtrate C after heavy metals and impurities are removed when the concentration of potassium chloride in the filtrate C reaches more than 100g/l in the sixth step to obtain a potassium chloride product.
Example 2
The method for producing zinc carbonate by using dechlorination wastewater of blast furnace cloth bag ash in embodiment 1 is characterized in that the first pulping step is to add the blast furnace cloth bag ash into clean water, and the weight ratio of the blast furnace cloth bag ash to the clean water is 1: 3-1: and 4, stirring the mixture for 2 to 3 hours at the same time to obtain slurry.
Example 3
The method for producing zinc carbonate by using dechlorination wastewater of blast furnace cloth bag ash in the embodiment 1, the fifth step of solid-liquid separation is to perform solid-liquid separation on the turbid liquid obtained in the fourth step to obtain filter residue A and filtrate C, the zinc content in the filtrate C is less than 0.5g/l, the filtrate C returns to the first step to replace clear water, the first step and the second step are repeated, and the zinc carbonate product with the grade of more than 50% is obtained after the filter residue A is dried.
Example 4
The method for producing zinc carbonate by using dechlorination wastewater of blast furnace cloth bag ash comprises six steps, wherein slurry is obtained in the first step, solid-liquid separation is carried out on the slurry obtained in the first step in the second step to obtain filtrate A and filter residue, the pH value of the filtrate A is 5.8, the filtrate A is returned to the first step to replace clear water in the third step, the processes of the first step and the second step are repeated until the zinc content in the obtained filtrate A reaches more than 10g/l, and the pH value is 5.8, to obtain filtrate B, adding potassium carbonate into the filtrate B to generate white precipitate until the pH value of the filtrate is 7, and simultaneously stirring for 2-3 hours to obtain a turbid solution, carrying out solid-liquid separation in the fifth step, and carrying out evaporative crystallization on the filtrate C after heavy metals and impurities are removed when the concentration of potassium chloride in the filtrate C reaches more than 100g/l in the sixth step to obtain a potassium chloride product.
Example 5
The method for producing zinc carbonate by using blast furnace cloth bag ash dechlorination wastewater comprises six steps, wherein slurry is obtained in the first step, solid-liquid separation is carried out on the slurry obtained in the first step in the second step to obtain filtrate A and filter residues, the pH value of the filtrate A is 6.2, the filtrate A is returned to the first step to replace clear water in the third step, the processes of the first step and the second step are repeated until the zinc content in the obtained filtrate A is higher than 10g/l and the pH value is 6.2 to obtain filtrate B, potassium carbonate is added into the filtrate B to generate white precipitate in the fourth step until the pH value in the filtrate is 7.5, stirring is carried out for 3 hours to obtain turbid liquid, solid-liquid separation is carried out in the fifth step, and when the potassium chloride concentration in the filtrate C is higher than 100g/l, heavy metals and impurities are removed from the filtrate C, evaporation crystallization is carried out to obtain a potassium chloride product.
Example 6
The method for producing zinc carbonate by using blast furnace cloth bag ash dechlorination wastewater comprises six steps, wherein slurry is obtained in the first step, solid-liquid separation is carried out on the slurry obtained in the first step in the second step to obtain filtrate A and filter residue, the pH value of the filtrate A is 6, the filtrate A is returned to the first step to replace clear water in the third step, the processes of the first step and the second step are repeated until the zinc content in the obtained filtrate A is higher than 10g/l and the pH value is 6 to obtain filtrate B, potassium carbonate is added into the filtrate B in the fourth step to generate white precipitate until the pH value in the filtrate is 7.3, stirring is carried out for 2.5 hours to obtain turbid liquid, solid-liquid separation is carried out in the fifth step, and when the potassium chloride concentration in the filtrate C is higher than 100g/l, heavy metals and impurities in the filtrate C are removed, evaporation and crystallization are carried out to obtain a potassium chloride product.
Example 7
The method for producing zinc carbonate by using dechlorination wastewater of blast furnace cloth bag ash in embodiment 2 is characterized in that the first pulping step is to add the blast furnace cloth bag ash into clean water, and the weight ratio of the blast furnace cloth bag ash to the clean water is 1: and 3, stirring the mixture for 2 hours at the same time to obtain slurry.
Example 8
The method for producing zinc carbonate by using dechlorination wastewater of blast furnace cloth bag ash in embodiment 2 is characterized in that the first pulping step is to add the blast furnace cloth bag ash into clean water, and the weight ratio of the blast furnace cloth bag ash to the clean water is 1: 4, stirring was performed simultaneously for 3 hours to obtain a slurry.
Example 9
The method for producing zinc carbonate by using dechlorination wastewater of blast furnace cloth bag ash in embodiment 2 is characterized in that the first pulping step is to add the blast furnace cloth bag ash into clean water, and the weight ratio of the blast furnace cloth bag ash to the clean water is 1: 3.5, stirring is carried out simultaneously, and stirring is carried out for 2.5 hours, so that slurry is obtained.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (3)
1. A method for producing zinc carbonate by using blast furnace cloth bag ash dechlorination wastewater is characterized by comprising six steps of pulping to obtain slurry in the first step, performing solid-liquid separation on the slurry in the first step to obtain filtrate A and filter residue, wherein the pH value of the filtrate A is 5.8-6.2, returning the filtrate A to the first step to replace clear water in the third step, repeating the processes of the first step and the second step until the zinc content in the obtained filtrate A is more than 10g/l and the pH value is 5.8-6.2 to obtain filtrate B, adding potassium carbonate into the filtrate B to generate white precipitate in the fourth step until the pH value in the filtrate A is 7-7.5, stirring for 2-3 hours to obtain turbid liquid, performing solid-liquid separation in the fifth step, removing heavy metals and impurities from the filtrate C in the sixth step when the potassium chloride concentration in the filtrate C is more than 100g/l, evaporating and crystallizing, the product potassium chloride is obtained.
2. The method for producing zinc carbonate by using dechlorination wastewater of blast furnace cloth bag ash as claimed in claim 1, wherein the first pulping step is to add the blast furnace cloth bag ash into clean water, and the weight ratio of the blast furnace cloth bag ash to the clean water is 1: 3-1: and 4, stirring the mixture for 2 to 3 hours at the same time to obtain slurry.
3. The method for producing zinc carbonate by using dechlorination wastewater of blast furnace cloth bag ash according to claim 1, wherein the fifth step of solid-liquid separation is to perform solid-liquid separation on the turbid liquid obtained in the fourth step to obtain filter residue A and filtrate C, the zinc content in the filtrate C is less than 0.5g/l, the filtrate C is returned to the first step to replace clear water, the first step and the second step are repeated, and the filter residue A is dried to obtain a zinc carbonate product with the grade of more than 50%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112158874A (en) * | 2020-09-19 | 2021-01-01 | 江苏省沙钢钢铁研究院有限公司 | Blast furnace cloth bag ash resource utilization process method |
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| JPH0248417A (en) * | 1988-08-08 | 1990-02-19 | Sumitomo Metal Ind Ltd | Production of zinc carbonate |
| CN102092771A (en) * | 2010-09-06 | 2011-06-15 | 汪晋强 | Method for producing ordinary zinc carbonate and caustic soda by using sodium hydrosulfite filtration residues |
| CN102642974A (en) * | 2012-05-07 | 2012-08-22 | 昆明理工大学 | Method for treating high-acid high-chlorine waste water |
| CN106745075A (en) * | 2016-11-15 | 2017-05-31 | 北京中水信科技有限公司 | The method and purposes of potassium chloride and sodium chloride are extracted in a kind of ash from secondary zinc oxide |
| CN107500340A (en) * | 2017-09-29 | 2017-12-22 | 景县煜川工贸有限公司 | The recycling method of zinc-plated scrap iron and steel and zinc in material containing zinc |
| CN108017085A (en) * | 2017-11-27 | 2018-05-11 | 西北矿冶研究院 | Method for preparing zinc carbonate by using zinc leaching residues |
-
2019
- 2019-08-22 CN CN201910776853.7A patent/CN110627106A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0248417A (en) * | 1988-08-08 | 1990-02-19 | Sumitomo Metal Ind Ltd | Production of zinc carbonate |
| CN102092771A (en) * | 2010-09-06 | 2011-06-15 | 汪晋强 | Method for producing ordinary zinc carbonate and caustic soda by using sodium hydrosulfite filtration residues |
| CN102642974A (en) * | 2012-05-07 | 2012-08-22 | 昆明理工大学 | Method for treating high-acid high-chlorine waste water |
| CN106745075A (en) * | 2016-11-15 | 2017-05-31 | 北京中水信科技有限公司 | The method and purposes of potassium chloride and sodium chloride are extracted in a kind of ash from secondary zinc oxide |
| CN107500340A (en) * | 2017-09-29 | 2017-12-22 | 景县煜川工贸有限公司 | The recycling method of zinc-plated scrap iron and steel and zinc in material containing zinc |
| CN108017085A (en) * | 2017-11-27 | 2018-05-11 | 西北矿冶研究院 | Method for preparing zinc carbonate by using zinc leaching residues |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112158874A (en) * | 2020-09-19 | 2021-01-01 | 江苏省沙钢钢铁研究院有限公司 | Blast furnace cloth bag ash resource utilization process method |
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