CN108793362B - Process for preparing acid and co-producing textile printing and dyeing wastewater flocculant - Google Patents
Process for preparing acid and co-producing textile printing and dyeing wastewater flocculant Download PDFInfo
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- CN108793362B CN108793362B CN201810712942.0A CN201810712942A CN108793362B CN 108793362 B CN108793362 B CN 108793362B CN 201810712942 A CN201810712942 A CN 201810712942A CN 108793362 B CN108793362 B CN 108793362B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/74—Preparation
- C01B17/76—Preparation by contact processes
- C01B17/78—Preparation by contact processes characterised by the catalyst used
- C01B17/79—Preparation by contact processes characterised by the catalyst used containing vanadium
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
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Abstract
The invention provides a process for preparing acid and co-producing a textile printing and dyeing wastewater flocculant, which comprises the following steps: mixing and grinding phosphogypsum, red mud, an additive and a modifier to prepare raw materials, and feeding the raw materials into a kiln for roasting to prepare clinker; dissolving out the prepared clinker, and carrying out solid-liquid separation; floating the separated residue, and separating to obtain sulfide; processing the separated sulfide to prepare sulfuric acid; evaporating the separated solution to obtain a solid substance, and crushing the fixed substance to obtain solid powder; and adding polyaluminium sulfate, sodium silicate, polyacrylamide, borax and sodium acetate into the obtained solid powder, and uniformly mixing to obtain the textile printing and dyeing wastewater flocculant. The invention has the characteristics of low cost for preparing acid and the flocculant for textile printing and dyeing wastewater, high utilization rate of the phosphogypsum and red mud waste residue, simple process and high quality of the flocculant for textile printing and dyeing wastewater.
Description
Technical Field
The invention relates to a process for co-producing a textile printing and dyeing wastewater flocculant by acid preparation, belonging to the field of metallurgy and chemical industry.
Background
Red mud is a waste produced in the process of refining alumina from bauxite. It is named because it is rich in iron and is in red mud state. About 1.0-2.0 tons of red mud are produced per 1 ton of alumina produced. The annual production amount of red mud in China is about 1.0 hundred million tons, and the accumulated stock amount is about 5 hundred million tons.
Phosphogypsum refers to solid waste residue generated when phosphorite is treated by sulfuric acid in phosphoric acid production, and the main component of the phosphogypsum is calcium sulfate (CaSO)4) The content of the compound can reach about 70-90%. In addition, phosphogypsum also contains a number of impurities: undecomposed phosphorus ore, phosphoric acid, calcium fluoride, iron, aluminum compounds, acid insoluble substances, organic matters and the like which are not washed clean. The annual emission of phosphogypsum in China is about 2000 million tons, and the accumulated emission is nearly hundred million tons. The utilization rate of the phosphogypsum in the aspect of building materials is less than 5 percent, a large amount of phosphogypsum slag yards occupy the land, and the environment is seriously polluted.
The waste mainly contains dirt, grease and salts on textile fibers and various sizing agents, dyes, surfactants, auxiliaries, acid and alkali and the like added in the processing process, and the textile printing and dyeing waste water has the characteristics of large water quantity, high organic pollutant content, deep chromaticity, large water quality change and the like, and belongs to industrial waste water which is difficult to treat. The existing flocculant for textile printing and dyeing wastewater comprises polyaluminium sulfate, sodium aluminate, activated silicic acid, polyacrylamide and borax, wherein the components are used for treating the textile printing and dyeing wastewater under the mutual coordination effect, the coagulation effect is quick, the decoloring effect is good, the dosage is small, the flocculant is suitable for textile wastewater with large water quality change, the acid resistance and the heat resistance are good, and the flocculant is suitable for wastewater with large water temperature change. However, the textile printing and dyeing wastewater flocculant contains sodium aluminate, the sodium aluminate is generally prepared by processing bauxite or aluminum hydroxide and sodium hydroxide, the processing technology of the sodium aluminate is complex, the production cost is high, the price of the sodium aluminate is high, and the production cost of the textile printing and dyeing wastewater flocculant is greatly increased.
At present, few technologies are used for comprehensive utilization of the phosphogypsum and the red mud, and the technologies are basically concentrated in the traditional fields of building materials, paving and the like, so that a large amount of high-value components in the phosphogypsum and the red mud are wasted, and the additional value is very low. The process for preparing acid and co-producing the textile printing and dyeing wastewater flocculant by comprehensively utilizing the phosphogypsum and the red mud is not reported.
Object of the Invention
The invention aims to provide a process for preparing acid and co-producing a textile printing and dyeing wastewater flocculant. The invention has the characteristics of low cost for preparing acid and the flocculant for textile printing and dyeing wastewater, high utilization rate of the phosphogypsum and red mud waste residue, simple process and high quality of the flocculant for textile printing and dyeing wastewater.
Technical scheme of the invention
A process for preparing acid and co-producing a textile printing and dyeing wastewater flocculant comprises the following steps:
A. mixing and grinding phosphogypsum, red mud, an additive and a modifier to prepare raw materials, and feeding the raw materials into a kiln for roasting to prepare clinker;
B. b, dissolving out the clinker prepared in the step A, and carrying out solid-liquid separation;
C. b, carrying out flotation on the residue obtained by separation in the step B, and separating to obtain sulfide;
D. placing the sulfide separated in the step C in a 30-50% oxygen-enriched environment, roasting for 3-5 hours at 800-1200 ℃, and absorbing by concentrated sulfuric acid after the smoke generated by roasting is subjected to vanadium pentoxide catalytic reaction to prepare sulfuric acid;
E. evaporating the solution obtained by separation in the step B to obtain a solid substance, and crushing the fixed substance to obtain solid powder;
F. and E, adding polyaluminium sulfate, sodium silicate, polyacrylamide, borax and sodium acetate into the solid powder obtained in the step E, and uniformly mixing to obtain the textile printing and dyeing wastewater flocculant.
In the acid making and co-production textile printing and dyeing wastewater flocculant process, in the step A, the red mud is the red mud generated by alumina production by a Bayer process; the additive is sodium carbonate or caustic soda; the modifier is anthracite, carbon or coal gangue.
In the process for coproducing the textile printing and dyeing wastewater flocculant in the acid production process, in the step A, the phosphogypsum and the Bayer red mud are mixed according to the weight ratio of 1:0.8-1.6 in the raw material, and the additive is added according to the Na contained in the raw material2O and A12O3+Fe2O3The total molecular ratio is 1:1, and the mixing proportion of the modifier is 10-25% of the total weight of the raw meal.
In the above-mentioned acid-making co-production process of the textile printing and dyeing wastewater flocculant, in the step a, the kiln is an industrial rotary kiln, an industrial tunnel kiln or an industrial vertical kiln.
In the acid preparation and co-production process of the textile printing and dyeing wastewater flocculant, in the step A, the roasting time is 1-2 hours at the temperature of 1000-.
In the acid preparation and co-production textile printing and dyeing wastewater flocculant process, in the step B, the clinker is firstly ground by water and then dissolved out; the liquid-solid volume ratio during dissolution is 3-6: 1.
In the acid preparation and textile printing and dyeing wastewater flocculant co-production process, the liquid-solid volume ratio during dissolution is 4-6: 1.
In the above-mentioned acid-making coproduction textile printing and dyeing wastewater flocculant process, in step E, the evaporation temperature is 100-.
In the step F, the textile printing and dyeing wastewater flocculant comprises, by weight, 20-25 parts of solid powder, 25-30 parts of polyaluminium sulfate, 5-10 parts of sodium silicate, 5-8 parts of polyacrylamide, 5-10 parts of borax and 10-15 parts of sodium acetate.
In the acid-making co-production textile printing and dyeing wastewater flocculant process, the textile printing and dyeing wastewater flocculant comprises, by weight, 22 parts of solid powder, 28 parts of polyaluminium sulfate, 8 parts of sodium silicate, 7 parts of polyacrylamide, 8 parts of borax and 12 parts of sodium acetate.
The invention makes the phosphogypsum and the red mud into useful substances through reaction and recombination. The general reaction scheme of the principle is:
CaSO4(phosphogypsum) + Na2O·SiO2·Al2O3(Red mud) → Na2O·Al2O3+CaO·SiO2↓ + [ sulfur)]
From the reaction formula, it can be known that CaO in phosphogypsum and SiO in red mud are used2To produce calcium orthosilicate (CaO. SiO)2↓) to obtain sodium aluminate (Na) with excellent solubility2O·Al2O3). In the reaction formula [ sulfur ]]The method is characterized in that the main component of the metal sulfide generated by a raw material modifier adding process is FeS; and leaching the sodium aluminate in the clinker, and then floating the obtained precipitate to obtain FeS.
Advantageous effects
1. The invention uses phosphogypsum and red mud as raw materials, and adds additives and modifiers, and then obtains clinker mainly containing silicate, aluminate and sulfide under the high-temperature roasting process, the main component of the aluminate is sodium aluminate, sodium aluminate can be recovered after dissolving out, sulfide is obtained after solid residue is floated, sulfuric acid is prepared by sulfide, and the flocculant for textile printing and dyeing wastewater is prepared by the recovered sodium aluminate and other raw materials. The utilization rate of the phosphogypsum and the red mud waste residue is greatly increased, and the method has important contribution to relieving the pollution of the phosphogypsum and the red mud to the environment.
2. The invention obtains the sulfide after the solid residue in the process is floated, and the sulfide is adopted to prepare the sulfuric acid, so the cost for preparing acid is low, and the acid preparation process is simple.
3. The raw materials are roasted to obtain clear components, the aluminum mainly exists in the form of sodium aluminate, the sodium aluminate is easy to dissolve in water, the sodium aluminate can be simply and quickly separated and used for preparing the textile printing and dyeing wastewater flocculant, the quality of the textile printing and dyeing wastewater flocculant is high, and the cost of the textile printing and dyeing wastewater flocculant is low.
To further prove the effects of the present invention, the inventors conducted the following experiments.
1. Quality detection of textile printing and dyeing wastewater flocculant
The flocculating agent in the following five groups of embodiments is used for treating the textile printing and dyeing wastewater, the textile printing and dyeing wastewater is filtered by a grating and then enters a sedimentation tank, and the flocculating agent is thrown into the textile printing and dyeing wastewater in the sedimentation tank for treatment. 400mg of flocculant is added into every 1L of sewage, obvious coagulation reaction occurs when the flocculant is added for 25 minutes, and the effect is shown in the table 1 after the treatment time is 2-3 hours:
TABLE 1 Experimental chart for flocculant of textile printing and dyeing wastewater
| Serial number | Total solids removal% | Chroma removal% | BOD removal Rate% | COD removal rate% |
| Example 1 | 90 | 87 | 80 | 77 |
| Example 2 | 88 | 90 | 78 | 65 |
| Example 3 | 84 | 80 | 75 | 75 |
| Example 4 | 86 | 85 | 77 | 68 |
| Example 5 | 87 | 88 | 81 | 72 |
As can be seen from the upper table, the flocculant for textile printing and dyeing wastewater has the advantages of quick coagulation effect, obvious effect, good decolorization effect, small dosage and high quality.
Detailed Description
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.
Examples of the invention
Example 1: a process for preparing acid and co-producing a textile printing and dyeing wastewater flocculant comprises the following steps:
A. mixing and grinding phosphogypsum, Bayer red mud, sodium carbonate and anthracite into raw materials, and feeding the raw materials into an industrial rotary kiln to roast for 2 hours at the temperature of 1000 ℃ to prepare clinker; wherein, the phosphogypsum and the Bayer red mud are mixed according to the weight ratio of 1:0.8, and the adding proportion of the sodium carbonate is according to the Na contained in the raw material2O and A12O3+Fe2O3The total molecular ratio is 1:1, and the mixing ratio of the anthracite is 10 percent of the total weight of the raw meal;
B. b, performing water milling dissolution on the clinker prepared in the step A at a liquid-solid volume ratio of 4:1, and performing solid-liquid separation;
C. b, carrying out flotation on the residue obtained by separation in the step B, and separating to obtain sulfide;
D. placing the sulfide separated in the step C in a 30% oxygen-enriched environment, roasting for 5 hours at 800 ℃, and absorbing the flue gas generated by roasting by adopting concentrated sulfuric acid after the catalytic reaction of vanadium pentoxide to prepare sulfuric acid;
E. evaporating the solution separated in the step B at the temperature of 100 ℃ to obtain a solid substance, and crushing the fixed substance to obtain solid powder;
F. and E, adding polyaluminium sulfate, sodium silicate, polyacrylamide, borax and sodium acetate into the solid powder obtained in the step E, and uniformly mixing to obtain the textile printing and dyeing wastewater flocculant, wherein the textile printing and dyeing wastewater flocculant comprises 22 parts of solid powder, 28 parts of polyaluminium sulfate, 8 parts of sodium silicate, 7 parts of polyacrylamide, 8 parts of borax and 12 parts of sodium acetate in parts by weight.
Example 2: a process for preparing acid and co-producing a textile printing and dyeing wastewater flocculant comprises the following steps:
A. mixing and grinding phosphogypsum, Bayer red mud, caustic soda and carbon to prepare raw material, and feeding the raw material into an industrial rotary kilnRoasting at 1200 deg.c for 1.5 hr to obtain clinker; wherein, the phosphogypsum and the Bayer red mud are mixed according to the weight ratio of 1:1, and the adding proportion of the caustic soda is according to the Na contained in the raw material2O and A12O3+Fe2O3The total molecular ratio is 1:1, and the mixing ratio of carbon is 15% of the total weight of the raw material;
B. b, carrying out water milling dissolution on the clinker prepared in the step A at a liquid-solid volume ratio of 5:1, and carrying out solid-liquid separation;
C. b, carrying out flotation on the residue obtained by separation in the step B, and separating to obtain sulfide;
D. placing the sulfide separated in the step C in a 35% oxygen-enriched environment, roasting for 4 hours at 900 ℃, and absorbing the flue gas generated by roasting by adopting concentrated sulfuric acid after the catalytic reaction of vanadium pentoxide to prepare sulfuric acid;
E. evaporating the solution separated in the step B at the temperature of 110 ℃ to obtain a solid substance, and crushing the fixed substance to obtain solid powder;
F. and E, adding polyaluminium sulfate, sodium silicate, polyacrylamide, borax and sodium acetate into the solid powder obtained in the step E, and uniformly mixing to obtain the textile printing and dyeing wastewater flocculant, wherein the textile printing and dyeing wastewater flocculant comprises 20 parts of solid powder, 30 parts of polyaluminium sulfate, 5 parts of sodium silicate, 8 parts of polyacrylamide, 5 parts of borax and 15 parts of sodium acetate in parts by weight.
Example 3: a process for preparing acid and co-producing a textile printing and dyeing wastewater flocculant comprises the following steps:
A. mixing and grinding phosphogypsum, Bayer red mud, sodium carbonate and coal gangue to prepare raw materials, and feeding the raw materials into an industrial rotary kiln to roast at 1300 ℃ for 1.5 hours to prepare clinker; wherein, the phosphogypsum and the Bayer red mud are mixed according to the weight ratio of 1:1.2, and the adding proportion of the sodium carbonate is according to the Na contained in the raw material2O and A12O3+Fe2O3The total molecular ratio is 1:1, and the mixing ratio of the coal gangue accounts for 20 percent of the total weight of the raw material;
B. b, performing water milling dissolution on the clinker prepared in the step A at a liquid-solid volume ratio of 6:1, and performing solid-liquid separation;
C. b, carrying out flotation on the residue obtained by separation in the step B, and separating to obtain sulfide;
D. placing the sulfide separated in the step C in a 45% oxygen-enriched environment, roasting for 3 hours at 1000 ℃, and absorbing the flue gas generated by roasting by adopting concentrated sulfuric acid after the catalytic reaction of vanadium pentoxide to prepare sulfuric acid;
E. evaporating the solution separated in the step B at the temperature of 120 ℃ to obtain a solid substance, and crushing the fixed substance to obtain solid powder;
F. and E, adding polyaluminium sulfate, sodium silicate, polyacrylamide, borax and sodium acetate into the solid powder obtained in the step E, and uniformly mixing to obtain the textile printing and dyeing wastewater flocculant, wherein the textile printing and dyeing wastewater flocculant comprises 25 parts of solid powder, 25 parts of polyaluminium sulfate, 10 parts of sodium silicate, 5 parts of polyacrylamide, 10 parts of borax and 10 parts of sodium acetate in parts by weight.
Example 4: a process for preparing acid and co-producing a textile printing and dyeing wastewater flocculant comprises the following steps:
A. mixing and grinding phosphogypsum, Bayer red mud, caustic soda and coal gangue to prepare raw materials, and feeding the raw materials into an industrial rotary kiln to roast at 1350 ℃ for 1 hour to prepare clinker; wherein, the phosphogypsum and the Bayer red mud are mixed according to the weight ratio of 1:1.4, and the addition ratio of the caustic soda is according to the Na contained in the raw material2O and A12O3+Fe2O3The total molecular ratio is 1:1, and the mixing ratio of the coal gangue accounts for 25 percent of the total weight of the raw material;
B. b, carrying out water milling dissolution on the clinker prepared in the step A at a liquid-solid volume ratio of 5:1, and carrying out solid-liquid separation;
C. b, carrying out flotation on the residue obtained by separation in the step B, and separating to obtain sulfide;
D. placing the sulfide separated in the step C in a 45% oxygen-enriched environment, roasting for 3 hours at 1200 ℃, and absorbing the flue gas generated by roasting by adopting concentrated sulfuric acid after the catalytic reaction of vanadium pentoxide to prepare sulfuric acid;
E. evaporating the solution separated in the step B at the temperature of 110 ℃ to obtain a solid substance, and crushing the fixed substance to obtain solid powder;
F. and E, adding polyaluminium sulfate, sodium silicate, polyacrylamide, borax and sodium acetate into the solid powder obtained in the step E, and uniformly mixing to obtain the textile printing and dyeing wastewater flocculant, wherein the textile printing and dyeing wastewater flocculant comprises 23 parts of solid powder, 27 parts of polyaluminium sulfate, 9 parts of sodium silicate, 6 parts of polyacrylamide, 7 parts of borax and 14 parts of sodium acetate in parts by weight.
Example 5: a process for preparing acid and co-producing a textile printing and dyeing wastewater flocculant comprises the following steps:
A. mixing and grinding phosphogypsum, Bayer red mud, caustic soda and anthracite into raw materials, and feeding the raw materials into an industrial rotary kiln to roast for 2 hours at the temperature of 1200 ℃ to prepare clinker; wherein, the phosphogypsum and the Bayer red mud are mixed according to the weight ratio of 1:1.6, and the addition ratio of the caustic soda is according to the Na contained in the raw material2O and A12O3+Fe2O3The total molecular ratio is 1:1, and the mixing ratio of the anthracite is 20 percent of the total weight of the raw meal;
B. b, performing water milling dissolution on the clinker prepared in the step A at a liquid-solid volume ratio of 4:1, and performing solid-liquid separation;
C. b, carrying out flotation on the residue obtained by separation in the step B, and separating to obtain sulfide;
D. placing the sulfide separated in the step C in a 50% oxygen-enriched environment, roasting for 4 hours at 1100 ℃, and absorbing the flue gas generated by roasting by using concentrated sulfuric acid after the flue gas is subjected to vanadium pentoxide catalytic reaction to prepare sulfuric acid;
E. evaporating the solution separated in the step B at the temperature of 120 ℃ to obtain a solid substance, and crushing the fixed substance to obtain solid powder;
F. and E, adding polyaluminium sulfate, sodium silicate, polyacrylamide, borax and sodium acetate into the solid powder obtained in the step E, and uniformly mixing to obtain the textile printing and dyeing wastewater flocculant, wherein the textile printing and dyeing wastewater flocculant comprises 25 parts of solid powder, 30 parts of polyaluminium sulfate, 10 parts of sodium silicate, 8 parts of polyacrylamide, 10 parts of borax and 15 parts of sodium acetate in parts by weight.
Claims (5)
1. The process for preparing the acid and co-producing the textile printing and dyeing wastewater flocculant is characterized by comprising the following steps of:
A. mixing and grinding phosphogypsum, red mud, an additive and a modifier to prepare raw materials, and feeding the raw materials into a kiln for roasting to prepare clinker;
B. b, dissolving out the clinker prepared in the step A, and carrying out solid-liquid separation;
C. b, carrying out flotation on the residue obtained by separation in the step B, and separating to obtain sulfide;
D. placing the sulfide separated in the step C in a 30-50% oxygen-enriched environment, roasting for 3-5 hours at 800-1200 ℃, and absorbing by concentrated sulfuric acid after the smoke generated by roasting is subjected to vanadium pentoxide catalytic reaction to prepare sulfuric acid;
E. evaporating the solution obtained by separation in the step B to obtain a solid substance, and crushing the fixed substance to obtain solid powder;
F. adding polyaluminium sulfate, sodium silicate, polyacrylamide, borax and sodium acetate into the solid powder obtained in the step E, and uniformly mixing to obtain a textile printing and dyeing wastewater flocculant;
in the step A, the red mud is the red mud generated by alumina production by a Bayer process; the additive is sodium carbonate or caustic soda; the modifier is anthracite, carbon or coal gangue;
in the step A, in the raw material, phosphogypsum and Bayer red mud are mixed according to the weight ratio of 1:0.8-1.6, and the additive is added according to the Na contained in the raw material2O and A12O3+Fe2O3The total molecular ratio is 1:1, and the mixing proportion of the modifier is 10-25% of the total weight of the raw material;
in the step A, the kiln is an industrial rotary kiln, an industrial tunnel kiln or an industrial vertical kiln;
in the step A, the roasting time is 1-2 hours at the temperature of 1000-;
in the step B, the clinker is firstly ground by water and then dissolved out; the liquid-solid volume ratio during dissolution is 3-6: 1.
2. The process for co-production of flocculant for textile printing and dyeing wastewater in acid making according to claim 1, characterized in that: the liquid-solid volume ratio during dissolution is 4-6: 1.
3. The process for co-production of flocculant for textile printing and dyeing wastewater in acid making according to claim 1, characterized in that: in the step E, the evaporation temperature is 100-120 ℃.
4. The process for co-production of flocculant for textile printing and dyeing wastewater in acid making according to claim 1, characterized in that: in the step F, the textile printing and dyeing wastewater flocculant comprises, by weight, 20-25 parts of solid powder, 25-30 parts of polyaluminium sulfate, 5-10 parts of sodium silicate, 5-8 parts of polyacrylamide, 5-10 parts of borax and 10-15 parts of sodium acetate.
5. The process for co-production of flocculant for textile printing and dyeing wastewater in acid making according to claim 4, characterized in that: the textile printing and dyeing wastewater flocculant comprises, by weight, 22 parts of solid powder, 28 parts of polyaluminium sulfate, 8 parts of sodium silicate, 7 parts of polyacrylamide, 8 parts of borax and 12 parts of sodium acetate.
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| CN105776150A (en) * | 2014-12-23 | 2016-07-20 | 中国科学院过程工程研究所 | Method for cooperative activation of fly ash and decomposition of gypsum for recovery of sulfur resource |
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