Raw material for preparing barium sulfate and method for preparing barium sulfate by recycling waste barium mud

A technology of barium sulfate and barium mud, which is applied in the direction of chemical instruments and methods, calcium/strontium/barium sulfate, calcium/strontium/barium compounds, etc., can solve the problems of using, being difficult to use, and not being able to be used as products, so as to reduce production cost effect

Inactive Publication Date: 2019-03-29

湖北谷城新和有限公司 +1

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AI-Extracted Technical Summary

Problems solved by technology

[0003] At present, various storage tanks are widely used in the precipitated barium sulfate industry. In the compounding process and drying process, the barium sulfate slurry needs to be buffered and stored in the storage tank. In the evaporation process, 5% sulfide lye and 20% sulfide Clarification in the clarification tank will produce c...

Abstract

The invention provides a method for preparing barium sulfate by recycling waste barium mud. The waste barium mud on the bottom of alkali solution storage tank and alkali solution clarifying tank in acompounding workshop is used as a raw material, so that the problems of space occupation and various pollutions to environment caused by the accumulated waste barium mud can be solved; the waste barium mud and coke dust can be calcined for regenerating barium sulfide which can be used as the raw material for producing barium sulfate; mass percent of barium sulfate in waste barium mud reaches up to96% or above, so that barium sulfide black ash with purity reaching up to 85% can be acquired through the reaction of waste barium mud and high-quality coke dust, and the barium sulfide content of the barium sulfide black ash is about 30% higher than that of the barium sulfide black ash acquired by calcining barite; according to the invention, waste barium mud is recycled, waste is turned into wealth and the method is economical and environment-friendly, so that a new method is supplied for solving the problem of solid waste emission in the industry of barium salt production and the production cost of enterprises can be greatly lowered.

Application Domain

Calcium/strontium/barium sulfates

Technology Topic

PollutionRaw material +4

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Examples

Experimental program(3)

Example Embodiment

[0031] Example one

[0032] The waste barium sludge from the bottom of the lye storage tank and lye clarification tank of the chemical compounding workshop will be stacked in the rain-proof storage yard for 90 days.

[0033] S1, air-dry the waste barium sludge to a moisture content of 15%, and add 20% by mass of coke powder with a carbon content of 80% to the waste barium sludge;

[0034] S2: Put the mixture into a pulverizer for pulverization, put the pulverized material in a ceramic crucible, and fire at 1000°C for 1 hour to obtain barium sulfide black ash;

[0035] S3, leaching the barium sulfide black ash obtained by roasting with condensed water, the leaching temperature is 75°C, and the leaching time is 60 min;

[0036] S4, adding a flocculant with a mass percentage of 0.02% to the barium sulfide solution, and the flocculant is aluminum sulfate;

[0037] S5: Add a sodium sulfate solution with a mass percentage of 20%, which is precision filtered using precision filter paper, to S4, and heat to 80°C for reaction;

[0038] S6, filtering the generated barium sulfate precipitate, washing with water to pH 7, and adding water to make a slurry to prepare a slurry with a mass percentage of barium sulfate of 20%;

[0039] S7, adding a surface modifier with a barium sulfate of 0.15% by mass, the surface modifier being sodium lauryl sulfate, heating to 65°C with a magnetic stirrer, maintaining the speed at 800r/min, and reacting for 30 minutes;

[0040] S8, filter and wash with water 3 times, dry, dry, and pulverize in a rotary flash dryer at 100°C to obtain a barium sulfate product.

[0041] The samples are tested according to GB/T 2889-2008.

[0042] 1. Detection of barium sulfate content in samples

[0043] The barium sulfate content is 98.31%.

[0044] 2. Barium sulfate particle size detection in the sample

[0045] Detected with BT-9300S laser particle size analyzer, D50=0.638.

[0046] 3. Detection of whiteness in samples

[0047] Detect with WSB-L whiteness meter, A means red-green, + means reddish,-means greenish; B means yellow-blue, + means yellowish,-means greenish.

[0048] Get the following data:

[0049] Hunter whiteness: 98.89%, blue light whiteness: 97.31%, a=-0.09, b=0.37

[0050] Detect the whiteness of barium sulfate produced by barite-mirabilite method of Qinba Barium Salt Company in Zhushan County

[0051] Hunter whiteness: 97.21%, blue light whiteness: 95.69%, a=-0.43, b=1.47

[0052] It shows that the whiteness of the barium sulfate prepared by the present invention is significantly increased. Because the b value is much smaller than the product produced by the barite-mirabilite method, the background color is closer to white.

[0053] Fourth, the detection of sample dispersion

[0054] (1) At the same time, weigh 30 grams each of the sample prepared by this method and the sample of the barite-mirabilite method. Placed in two sample dispensers respectively. Add 50 grams of epoxy resin, 20 milliliters of butyl ester solvent, and 20 milliliters of glass beads. Turn on the disperser at 1800 rpm, disperse for 10 minutes, take it out and let it stand for 10 minutes;

[0055] (2) Test the dispersion with a scraper fineness meter

[0056] Barite-Glauber's salt method sample, the dispersion degree is 38 microns,

[0057] Barium mud is recovered to prepare samples with a dispersion of 17 microns,

[0058] It shows that the dispersibility is far better than the barium sulfate produced by the conventional barite-mirabilite method.

Example Embodiment

[0059] Example two

[0060] The waste barium sludge from the bottom of the lye storage tank and lye clarification tank of the chemical workshop will be stacked in the rain-proof storage yard for 120 days.

[0061] S1, air-dry the waste barium mud to a moisture content of 12%, and add 33% by mass of coke powder with a carbon content of 83% to the waste barium mud;

[0062] S2: Put the mixture into a pulverizer for pulverization, put the pulverized material in a ceramic crucible, and fire at 1050°C for 75 minutes to obtain barium sulfide black ash;

[0063] S3, leaching the barium sulfide black ash obtained by roasting with condensed water, the leaching temperature is 78°C, and the leaching time is 75min;

[0064] S4, adding a flocculant with a mass percentage of 0.05% to the barium sulfide solution, and the flocculant is aluminum sulfate;

[0065] S5: Add a sodium sulfate solution with a mass percentage of 23% by precision filtration with precision filter paper to S4, and heat to 83°C for reaction;

[0066] S6, filtering the generated barium sulfate precipitate, washing with water to a pH of 7.5, and mixing with water to prepare a slurry with a mass percentage of barium sulfate of 25%;

[0067] S7, adding a surface modifier with a mass percentage of barium sulfate of 0.2%, the surface modifier being sodium lauryl sulfate, heating to 68°C with a magnetic stirrer, keeping the rotation speed at 900r/min, and reacting for 40min;

[0068] S8, filtering and washing with water 4 times, drying, drying and pulverizing in a rotary flash dryer at 110°C to obtain a barium sulfate product.

[0069] The samples are tested according to GB/T 2889-2008.

[0070] 1. Detection of barium sulfate content in samples

[0071] The barium sulfate content is 98.96%.

[0072] 2. Detection of barium sulfate particle size in samples

[0073] Detected with BT-9300S laser particle size analyzer, D50=0.649.

[0074] Three, the detection of sample whiteness

[0075] Detect with WSB-L whiteness meter, A means red-green, + means reddish,-means greenish; B means yellow-blue, + means yellowish,-means greenish.

[0076] Get the following data:

[0077] Hunter whiteness: 99.32%, blue light whiteness: 98.16%, a=-0.08, b=0.22

[0078] Detect the whiteness of barium sulfate produced by barite-mirabilite method of Qinba Barium Salt Company in Zhushan County

[0079] Hunter whiteness: 97.58%, blue light whiteness: 95.12%, a=-0.52, b=1.59

[0080] It shows that the whiteness of the barium sulfate prepared by this method is significantly increased. Because the b value is much smaller than the product produced by the barite-mirabilite method, the background color is closer to white.

[0081] Fourth, the detection of sample dispersion

[0082] (1) At the same time, weigh 30 grams each of the sample prepared by this method and the sample of the barite-mirabilite method. Placed in two sample dispensers respectively. Add 50 grams of epoxy resin, 20 milliliters of butyl ester solvent, and 20 milliliters of glass beads. Turn on the disperser at 1800 rpm, disperse for 10 minutes, take it out and let it stand for 10 minutes;

[0083] (2) Test the dispersion with a scraper fineness meter

[0084] Barite-Glauber's salt method sample, with a dispersion of 42 microns,

[0085] Barium mud is recovered to prepare samples with a dispersion of 15 microns,

[0086] It shows that the dispersibility is far better than the barium sulfate produced by the conventional barite-mirabilite method.

Example Embodiment

[0087] Example three

[0088] The waste barium sludge from the bottom of the lye storage tank and lye clarification tank in the chemical workshop will be stored in the rain-proof storage yard for 150 days.

[0089] S1, air-dry the waste barium sludge to a moisture content of 10%, and add 38% by mass of coke powder with a carbon content of 85% to the waste barium sludge;

[0090] S2: Put the mixture into a pulverizer for pulverization, place the pulverized material in a ceramic crucible, and fire at 1150°C for 1.5 hours to obtain barium sulfide black ash;

[0091] S3, leaching the barium sulfide black ash obtained by roasting with condensed water, the leaching temperature is 80°C, and the leaching time is 90 minutes;

[0092] S4, adding a flocculant with a mass percentage of 0.1% to the barium sulfide solution, and the flocculant is aluminum sulfate;

[0093] S5: Add a sodium sulfate solution with a mass percentage of 25% by precision filtration with precision filter paper to S4, and heat to 85°C to react;

[0094] S6, filtering the generated barium sulfate precipitate, washing with water to pH 8, and adding water to make a slurry to prepare a slurry with a mass percentage of barium sulfate of 30%;

[0095] S7, adding a surface modifier with a mass percentage of 0.3% barium sulfate, the surface modifier being sodium lauryl sulfate, heating to 70°C with a magnetic stirrer, keeping the rotation speed at 1000r/min, and reacting for 45min;

[0096] S8, filtering and washing with water 5 times, drying and pulverizing in a rotary flash dryer at 120°C to obtain a barium sulfate product.

[0097] The samples are tested according to GB/T 2889-2008.

[0098] 1. Detection of barium sulfate content in samples

[0099] The barium sulfate content is 99.12%.

[0100] 2. Detection of barium sulfate particle size in samples

[0101] Detected with BT-9300S laser particle size analyzer, D50=0.701.

[0102] Three, the detection of sample whiteness

[0103] Detect with WSB-L whiteness meter, A means red-green, + means reddish,-means greenish; B means yellow-blue, + means yellowish,-means greenish.

[0104] Get the following data:

[0105] Hunter whiteness: 99.18%, blue light whiteness: 98.32%, a=-0.02, b=0.29

[0106] Detect the whiteness of barium sulfate produced by barite-mirabilite method of Qinba Barium Salt Company in Zhushan County

[0107] Hunter whiteness: 97.64%, blue light whiteness: 96.07%, a = -0.68, b = 1.62

[0108] It shows that the whiteness of the barium sulfate prepared by this method is significantly increased. Because the b value is much smaller than the product produced by the barite-mirabilite method, the background color is closer to white.

[0109] Fourth, the detection of sample dispersion

[0110] (1) At the same time, weigh 30 grams each of the sample prepared by this method and the sample of the barite-mirabilite method. Placed in two sample dispensers respectively. Add 50 grams of epoxy resin, 20 milliliters of butyl ester solvent, and 20 milliliters of glass beads. Turn on the disperser at 1800 rpm, disperse for 10 minutes, take it out and let it stand for 10 minutes;

[0111] (2) Test the dispersion with a scraper fineness meter

[0112] Barite-Glauber's salt method sample, the dispersion degree is 46 microns;

[0113] Barium mud recovery to prepare samples with a dispersion of 15 microns;

[0114] It shows that the dispersibility is far better than the barium sulfate produced by the conventional barite-mirabilite method.

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reduce manufacturing cost

Raw material for preparing barium sulfate and method for preparing barium sulfate by recycling waste barium mud

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Problems solved by technology

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Description & Claims & Application Information

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