CN108715736A - A kind of technique preparing medal polish cream coproduction acid - Google Patents

Abstract

The invention provides a process for preparing metal polishing paste for co-production of acid, comprising the following steps: mixing and grinding phosphogypsum, fly ash, additives and modifiers to make raw meal, sending it into a kiln for roasting to obtain clinker; The clinker is dissolved, and solid-liquid separation is carried out; the separated solution is prepared into alumina; the prepared alumina is ground and mixed with lime, white mud, feldspar powder, and chromium oxide to obtain a mixed material a, and the mixed material a is mixed with stearin Acid, paraffin wax, palm wax, ethanol, oleic acid, olive oil, soybean lecithin, hard ashes oil and polyethylene glycol are ground and mixed, heated and stirred, and cooled to obtain a metal polishing paste; the separated residue is subjected to flotation to obtain sulfide; Sulfides are processed to produce sulfuric acid. The invention has the advantages of low cost for preparing metal polishing paste and acid production, high waste slag utilization rate, good polishing effect, complete removal of surface dirt and long polishing life, and simple acid production process. .

Description

A process for preparing metal polishing paste and co-producing acid

technical field

The invention relates to a process for preparing metal polishing paste for co-production of acid, which belongs to the field of metallurgy and chemical industry.

Background technique

The research on metal surface polishing aids has been developed by leaps and bounds. With the continuous update of products, the requirements for such metal surface polishing aids are getting higher and higher. It not only has the functions of metal surface decontamination, polishing, manual polishing, scratch removal, and material anticorrosion, but also requires it to be safe and non-toxic. Pollution. Existing a kind of metal polishing paste has the fast surface oxidation effect after treatment, good polishing effect, can realize decontamination, polish, care etc., work efficiency is high simultaneously, but in the production of this metal polishing paste, due to metal The processing raw material of the polishing paste contains alumina, but the production process of the existing alumina powder is complex and the production cost is high, resulting in high price of the alumina powder, which greatly increases the production cost of the metal polishing paste.

Phosphogypsum refers to the solid waste generated when sulfuric acid is used to treat phosphate rock in the production of phosphoric acid. Its main component is calcium sulfate (CaSO ₄ ), and its content can generally reach about 70-90%. In addition, phosphogypsum also contains a variety of impurities: undecomposed phosphate rock, unwashed phosphoric acid, calcium fluoride, iron, aluminum compounds, acid insoluble matter, organic matter, etc. my country emits about 20 million tons of phosphogypsum every year, with a cumulative discharge of nearly 100 million tons. The utilization rate of phosphogypsum in building materials is less than 5%, and a large number of phosphogypsum slag fields occupy land and seriously pollute the environment.

my country is a large coal-producing country, and coal is used as the basic fuel for electric power production. my country's energy industry has developed steadily, with an annual growth rate of 7.3% in power generation capacity. The rapid development of the power industry has brought about a sharp increase in the amount of fly ash discharged. The total amount of fly ash emitted by coal-fired thermal power plants has increased year by year. In 1995 The annual fly ash discharge amounted to 125 million tons, about 150 million tons in 2000, and will reach 300 million tons by 2010, which has caused enormous pressure on my country's national economic construction and ecological environment.

At present, there are few technologies for the comprehensive utilization of phosphogypsum and fly ash, and they are basically concentrated in traditional fields such as building materials and paving, which results in the waste of a large number of high-value components in phosphogypsum and fly ash, and the added value is very low . However, the comprehensive utilization of phosphogypsum and fly ash to make metal polishing paste and the simultaneous production of acid have not been reported.

purpose of invention

The object of the present invention is to provide a process for preparing metal polishing paste with co-production of acid. The invention has the advantages of low cost for preparing metal polishing paste and acid production, high waste slag utilization rate, good polishing effect, complete removal of surface dirt and long polishing life, and simple acid production process. .

Technical scheme of the present invention

A kind of technique for preparing metal polishing paste co-production acid, comprises the steps:

A. Mix and grind phosphogypsum, fly ash, additives and modifiers to make raw meal, send it to the kiln for roasting, and make clinker;

B, dissolving the clinker prepared in step A, and carrying out solid-liquid separation;

C. Add _CO to the solution separated in step B until the white precipitate is no longer produced, then filter the white precipitate, wash, dry and burn, and pulverize to obtain alumina powder;

D. Grinding and mixing the alumina powder prepared in step C with lime, white mud, feldspar powder, and chromium oxide to obtain a mixed material a, and mixing the mixed material a with stearic acid, paraffin wax, palm wax, ethanol, oleic acid, olive oil , soybean lecithin, hard asparagus oil and polyethylene glycol are ground and mixed, heated and stirred, and cooled to obtain a metal polishing paste;

E, the residue obtained by step B separation is separated to obtain sulfide through flotation;

F. Place the sulfide separated in step E in a 30-50% oxygen-enriched environment, and roast it at 800-1200°C for 3-5h. Absorption, producing sulfuric acid.

In the aforementioned process for preparing metal polishing paste for co-production of acid, in step A, the additive is sodium carbonate, sodium sulfate or caustic soda; the modifier is anthracite, carbon or gangue.

In the aforementioned process for preparing metal polishing paste for co-production of acid, in step A, in the raw meal, phosphogypsum and fly ash are mixed according to the ratio of 1:0.6-2 by weight, and the additive addition ratio is as stated in the raw meal. The molecular ratio of the sum of Na ₂ O and A1 ₂ O ₃ +Fe ₂ O ₃ is 1:1, and the mixing ratio of the modifier is 10-25% of the total weight of the raw meal.

In the aforementioned process for preparing metal polishing paste for co-production of acid, in step A, the kiln is an industrial rotary kiln, an industrial tunnel kiln or an industrial shaft kiln.

In the aforementioned process for preparing metal polishing paste for co-production of acid, in step A, the firing time is 1-2 hours at a temperature of 1000-1350°C.

In the aforementioned process of preparing metal polishing paste for co-production of acid, in step B, the clinker is milled with water and then dissolved; the liquid-solid volume ratio during dissolution is 3-6:1.

In the aforementioned process of preparing metal polishing paste for co-production of acid, the liquid-solid volume ratio during dissolution is 4-6:1.

In the aforementioned process of preparing metal polishing paste for co-production of acid, in step C, the burning is at a temperature of 900-1200° C. for 3-5 hours.

In the aforementioned process for preparing metal polishing paste for co-production of acid, in step D, by weight, the metal polishing paste comprises 5-10 parts of alumina powder, 15-20 parts of stearic acid, 4-5 parts of paraffin, 2-3 parts of palm wax, 35-40 parts of lime, 15-20 parts of ethanol, 3-5 parts of oleic acid, 2-3 parts of chromium oxide, 6-8 parts of white mud, 3-4 parts of feldspar powder, 4 parts of olive oil -6 parts, 2-3 parts of soybean lecithin, 2-4 parts of hard asparagus oil and 7-9 parts of polyethylene glycol.

In the aforementioned process of preparing metal polishing paste for co-production of acid, in step D, the heating and stirring is carried out at a temperature of 70-80° C. for 30-40 minutes.

The invention makes the phosphogypsum and fly ash react and reorganize into useful substances. The overall reaction formula of the principle is:

CaSO ₄ (phosphogypsum) + Na ₂ O·SiO ₂ ·Al ₂ O ₃ (fly ash) → Na ₂ O·Al ₂ O ₃ + CaO·SiO ₂ ↓ + [sulfur]

It can be seen from the reaction formula that after CaO in phosphogypsum and SiO ₂ in fly ash are used to generate calcium orthosilicate (CaO·SiO ₂ ↓), sodium aluminate (Na ₂ O·Al ₂ O ₃ ). [Sulphur] in the reaction formula refers to the metal sulfide generated by adding additives and modifiers to the raw meal; after leaching the sodium aluminate in the clinker, the obtained precipitate can be flotation to obtain the metal sulfide .

Beneficial effect

1. The present invention uses phosphogypsum and fly ash as raw materials, and after adding additives and modifiers, obtains clinker mainly containing silicates, aluminates and sulfides under the high-temperature roasting process, and the aluminum The main component of acid salt is sodium aluminate, which can be recovered after dissolving sodium aluminate in water, and after flotation of solid residue, sulfide is obtained, and sulfuric acid is prepared by using sulfide.

Alumina is prepared from recovered sodium aluminate, and metal polishing paste is prepared from alumina and other raw materials. Since phosphogypsum and fly ash are mainly used as raw materials in the whole process, a small amount of other substances can be added. Therefore, the acid production is greatly reduced. And the cost input of metal polishing paste. It also greatly increases the utilization rate of phosphogypsum and fly ash waste residue, and makes an important contribution to alleviating the pollution of phosphogypsum and fly ash to the environment.

2. After the raw materials passed in the present invention are roasted, the obtained components are distinct, and aluminum mainly exists in the form of sodium aluminate. Utilizing the characteristics that sodium aluminate is very soluble in water, it can be easily and quickly separated and used for the preparation of alumina. Aluminum oxide and other raw materials are used to prepare a metal polishing paste. The metal polishing paste has the advantages of good polishing effect, complete removal of surface dirt, long polishing life, and low cost of the metal polishing paste.

3. The present invention obtains sulfide after flotation of the solid residue in the process, and uses the sulfide to prepare sulfuric acid. The cost of acid production is low and the acid production process is simple.

In order to further prove the effect of the present invention, the inventors did the following experiments.

1. Experiment of metal polishing paste

The inventor polished five identical metal surfaces with the metal polishing paste in the following five groups of examples, and recorded the polishing time when the metal surface was bright, and left the polished metal naturally for 20 days, and observed the polishing with naked eyes. On the other hand, the experimental results are as follows:

Obtained by the analysis of the experimental results of the metal polishing paste of the present invention in Table 1, the metal polishing paste of the present invention has fast polishing, good effect, and does not need to carry out secondary polishing within 20 days, so the metal polishing paste of the present invention has a good polishing effect, completely removes surface dirt, and polishes The advantages of long life.

Detailed ways

The present invention will be further described below in conjunction with the examples, but not as a basis for limiting the present invention.

Embodiments of the invention

Embodiment 1: a kind of technique of preparing metal polishing paste co-production acid, the steps are as follows:

A. Mix and grind phosphogypsum, fly ash, sodium carbonate and anthracite to make raw meal, send it to an industrial rotary kiln and roast it for 1.5 hours at a temperature of 1000°C to obtain clinker; among them, phosphogypsum and fly ash Mix according to the weight ratio of 1:0.6, add sodium carbonate according to the molecular ratio of the sum of Na ₂ O and A1 ₂ O ₃ +Fe ₂ O ₃ contained in the raw meal as 1:1, and add anthracite in the ratio of raw meal 10% of the total weight;

B, the clinker that step A is made is that 4:1 carries out water grinding stripping with liquid-solid volume ratio, and carries out solid-liquid separation;

C, the residue obtained by step B separation is separated to obtain sulfide through flotation;

D, place the sulfide isolated in step C under 30% oxygen-enriched environment, roast 5h at 800 DEG C, after the flue gas that roasting produces is through vanadium pentoxide catalytic reaction, adopt concentrated sulfuric acid to absorb, make sulfuric acid;

E. Add _CO2 to the solution separated in step B until the white precipitate is no longer produced, then filter the white precipitate, wash and dry it, burn it at 900°C for 5 hours, and pulverize it to obtain alumina powder;

F, grind and mix the aluminum oxide powder prepared in step E with lime, white mud, feldspar powder, and chromium oxide to obtain a mixed material a, mix the mixed material a with stearic acid, paraffin wax, palm wax, ethanol, oleic acid, olive oil , soybean lecithin, hard asparagus oil and polyethylene glycol are ground and mixed, heated and stirred, and the heated and stirred is stirred at a temperature of 70° C. for 30 minutes, and cooled to obtain a metal polishing paste; wherein the metal polishing paste contains aluminum oxide in parts by weight. 5 parts of powder, 15 parts of stearic acid, 4 parts of paraffin wax, 2 parts of palm wax, 35 parts of lime, 15 parts of ethanol, 3 parts of oleic acid, 2 parts of chromium oxide, 6 parts of white mud, 3 parts of feldspar powder, 4 parts of olive oil 2 parts, 2 parts of soybean lecithin, 2 parts of hard asparagus oil and 7 parts of polyethylene glycol.

Embodiment 2: a kind of technique of preparing metal polishing paste co-production acid, the steps are as follows:

A. Mix and grind phosphogypsum, fly ash, sodium sulfate and carbon to make raw meal, send it to an industrial rotary kiln and roast it for 2 hours at a temperature of 1200°C to obtain clinker; among them, phosphogypsum and fly ash are prepared according to 1:1 weight ratio, caustic soda is added according to the molecular ratio of the sum of Na ₂ O and A1 ₂ O ₃ +Fe ₂ O ₃ contained in the raw meal is 1:1.2, and the mixing ratio of carbon is the total weight of the raw meal 15% of

B, the clinker that step A is made is that 5:1 carries out water grinding stripping with liquid-solid volume ratio, and carries out solid-liquid separation;

C, the residue obtained by step B separation is separated to obtain sulfide through flotation;

D, place the sulfide isolated in step C under 35% oxygen-enriched environment, roast 4h at 900 DEG C, after the flue gas that roasting produces is through vanadium pentoxide catalytic reaction, adopt concentrated sulfuric acid to absorb, make sulfuric acid;

E. Add _CO2 to the solution separated in step B until the white precipitate no longer occurs, then filter out the white precipitate, wash and dry it, burn it at 1000°C for 4 hours, and then pulverize it to obtain alumina powder;

F, grind and mix the aluminum oxide powder prepared in step E with lime, white mud, feldspar powder, and chromium oxide to obtain a mixed material a, mix the mixed material a with stearic acid, paraffin wax, palm wax, ethanol, oleic acid, olive oil , soybean lecithin, hard asparagus oil and polyethylene glycol are ground and mixed, heated and stirred, and the heated and stirred is stirred at a temperature of 75° C. for 35 minutes, and cooled to obtain a metal polishing paste; wherein the metal polishing paste contains aluminum oxide in parts by weight. 7 parts of powder, 18 parts of stearic acid, 4 parts of paraffin wax, 3 parts of palm wax, 36 parts of lime, 17 parts of ethanol, 4 parts of oleic acid, 2 parts of chromium oxide, 7 parts of white clay, 3 parts of feldspar powder, 5 parts of olive oil 3 parts, 3 parts of soybean lecithin, 3 parts of hard asparagus oil and 8 parts of polyethylene glycol.

Embodiment 3: a kind of technique of preparing metal polishing paste co-production acid, the steps are as follows:

A. Mix and grind phosphogypsum, fly ash, caustic soda and coal gangue to make raw meal, send it to an industrial rotary kiln and roast it at a temperature of 1300°C for 1.5 hours to obtain clinker; among them, phosphogypsum and fly ash Mix according to the weight ratio of 1:1.4, add sodium carbonate according to the molecular ratio of the sum of Na ₂ O and A1 ₂ O ₃ +Fe ₂ O ₃ contained in the raw meal as 1:1, and the mixing ratio of coal gangue is raw 20% of the total weight of the material;

B, the clinker that step A is made is that 6:1 carries out water grinding stripping with liquid-solid volume ratio, and carries out solid-liquid separation;

C, the residue obtained by step B separation is separated to obtain sulfide through flotation;

D, place the sulfide isolated in step C under 45% oxygen-enriched environment, roast 3h at 1000 DEG C, after the flue gas that roasting produces is through vanadium pentoxide catalytic reaction, adopt concentrated sulfuric acid to absorb, make sulfuric acid;

E. Add _CO2 to the solution separated in step B until the white precipitate is no longer produced, then filter the white precipitate, wash and dry it, burn it at 1100°C for 3 hours, and pulverize it to obtain alumina powder;

F, grind and mix the aluminum oxide powder prepared in step E with lime, white mud, feldspar powder, and chromium oxide to obtain a mixed material a, mix the mixed material a with stearic acid, paraffin wax, palm wax, ethanol, oleic acid, olive oil , soybean lecithin, hard asparagus oil and polyethylene glycol are ground and mixed, heated and stirred, and the heated and stirred is stirred at a temperature of 80° C. for 40 minutes, and cooled to obtain a metal polishing paste; wherein by weight, the metal polishing paste contains aluminum oxide 8 parts of powder, 19 parts of stearic acid, 5 parts of paraffin wax, 2 parts of palm wax, 37 parts of lime, 18 parts of ethanol, 3 parts of oleic acid, 3 parts of chromium oxide, 8 parts of white clay, 4 parts of feldspar powder, 4 parts of olive oil 2 parts of soybean lecithin, 4 parts of hard asparagus oil and 8 parts of polyethylene glycol.

Embodiment 4: a kind of technique of preparing metal polishing paste co-production acid, the steps are as follows:

A. Mix and grind phosphogypsum, fly ash, sodium carbonate and coal gangue to make raw meal, send it to an industrial rotary kiln and roast it at a temperature of 1350°C for 1 hour to make clinker; among them, phosphogypsum and fly ash Mix according to the weight ratio of 1:1.7, caustic soda is added according to the molecular ratio of the sum of Na ₂ O and A1 ₂ O ₃ +Fe ₂ O ₃ contained in the raw meal is 1:1, and the mixing ratio of coal gangue is raw meal 25% of the total weight;

B, the clinker that step A is made is that 5:1 carries out water grinding stripping with liquid-solid volume ratio, and carries out solid-liquid separation;

C, the residue obtained by step B separation is separated to obtain sulfide through flotation;

D, place the sulfide isolated in step C under 45% oxygen-enriched environment, roast 3h at 1200 DEG C, after the flue gas that roasting produces is through vanadium pentoxide catalytic reaction, adopt concentrated sulfuric acid to absorb, make sulfuric acid;

E. Add _CO2 to the solution separated in step B until the white precipitate is no longer produced, then filter the white precipitate, wash and dry it, burn it at 1200°C for 3 hours, and pulverize it to obtain alumina powder;

F, grind and mix the aluminum oxide powder prepared in step E with lime, white mud, feldspar powder, and chromium oxide to obtain a mixed material a, mix the mixed material a with stearic acid, paraffin wax, palm wax, ethanol, oleic acid, olive oil , soybean lecithin, hard asparagus oil and polyethylene glycol are ground and mixed, heated and stirred, and the heated and stirred is stirred at a temperature of 75° C. for 35 minutes, and cooled to obtain a metal polishing paste; wherein the metal polishing paste contains aluminum oxide in parts by weight. 9 parts of powder, 16 parts of stearic acid, 4 parts of paraffin wax, 3 parts of palm wax, 38 parts of lime, 19 parts of ethanol, 4 parts of oleic acid, 2 parts of chromium oxide, 7 parts of white clay, 3 parts of feldspar powder, 5 parts of olive oil 3 parts, 3 parts of soybean lecithin, 3 parts of hard asparagus oil and 7 parts of polyethylene glycol.

Embodiment 5: a kind of technique of preparing metal polishing paste co-production acid, the steps are as follows:

A. Mix and grind phosphogypsum, fly ash, sodium sulfate and anthracite to make raw meal, send it to an industrial rotary kiln and roast it at a temperature of 1200°C for 2 hours to obtain clinker; among them, phosphogypsum and fly ash according to Mix in a ratio of 1:2 by weight, caustic soda is added according to the molecular ratio of the sum of Na ₂ O and A1 ₂ O ₃ +Fe ₂ O ₃ contained in the raw meal as 1:1, and the mixing ratio of anthracite is the total weight of the raw meal 20% of

B, the clinker that step A is made is that 4:1 carries out water grinding stripping with liquid-solid volume ratio, and carries out solid-liquid separation;

C, the residue obtained by step B separation is separated to obtain sulfide through flotation;

D, place the sulfide isolated in step C under 50% oxygen-enriched environment, roast 4h at 1100 DEG C, after the flue gas that roasting produces is through vanadium pentoxide catalytic reaction, adopt concentrated sulfuric acid to absorb, make sulfuric acid;

E. Add _CO2 to the solution separated in step B until the white precipitate no longer occurs, then filter out the white precipitate, wash and dry it, burn it at 1200°C for 5 hours, and pulverize it to obtain alumina powder;

F, grind and mix the aluminum oxide powder prepared in step E with lime, white mud, feldspar powder, and chromium oxide to obtain a mixed material a, mix the mixed material a with stearic acid, paraffin wax, palm wax, ethanol, oleic acid, olive oil , soybean lecithin, hard asparagus oil and polyethylene glycol are ground and mixed, heated and stirred, and the heated and stirred is stirred at a temperature of 80° C. for 40 minutes, and cooled to obtain a metal polishing paste; wherein by weight, the metal polishing paste contains aluminum oxide 10 parts of powder, 20 parts of stearic acid, 5 parts of paraffin wax, 3 parts of palm wax, 40 parts of lime, 20 parts of ethanol, 5 parts of oleic acid, 3 parts of chromium oxide, 8 parts of white mud, 4 parts of feldspar powder, 6 parts of olive oil 3 parts of soybean lecithin, 4 parts of hard asparagus oil and 9 parts of polyethylene glycol.

Claims (10)

1. a technique for preparing metal polishing paste co-production acid is characterized in that, comprises the steps: A. Mix and grind phosphogypsum, fly ash, additives and modifiers to make raw meal, send it to the kiln for roasting, and make clinker; B, dissolving the clinker prepared in step A, and carrying out solid-liquid separation; C. Add _CO to the solution separated in step B until the white precipitate is no longer produced, then filter the white precipitate, wash, dry and burn, and pulverize to obtain alumina powder; D. Grinding and mixing the alumina powder prepared in step C with lime, white mud, feldspar powder, and chromium oxide to obtain a mixed material a, and mixing the mixed material a with stearic acid, paraffin wax, palm wax, ethanol, oleic acid, olive oil , soybean lecithin, hard asparagus oil and polyethylene glycol are ground and mixed, heated and stirred, and cooled to obtain a metal polishing paste; E, the residue obtained by step B separation is separated to obtain sulfide through flotation; F. Place the sulfide separated in step E in a 30-50% oxygen-enriched environment, and roast it at 800-1200°C for 3-5h. Absorption, producing sulfuric acid. 2. the technique for preparing metal polishing paste co-production acid according to claim 1 is characterized in that: in step A, described additive is sodium carbonate, sodium sulfate or caustic soda; Described modifying agent is anthracite, carbon or coal gangue. 3. the technique for preparing metal polishing paste co-production acid according to claim 1, is characterized in that: in step A, in described raw meal, phosphogypsum and fly ash are according to the ratio of 1:0.6-2 weight ratio Mixing, the addition ratio of additives is 1:1 according to the molecular ratio of the sum of Na ₂ O and A1 ₂ O ₃ +Fe ₂ O ₃ contained in the raw meal, and the mixing ratio of the modifier is 10-25% of the total weight of the raw meal . 4. The process for preparing metal polishing paste with co-production of acid according to claim 1, characterized in that: in step A, the kiln is an industrial rotary kiln, an industrial tunnel kiln or an industrial shaft kiln. 5. The process for preparing metal polishing paste with co-production of acid according to claim 1, characterized in that: in step A, the firing time is 1-2 hours at a temperature of 1000-1350°C. 6. The process for preparing metal polishing paste for co-production of acid according to claim 1, characterized in that: in step B, the clinker is first water-milled and then dissolved; the liquid-solid volume ratio during dissolution is 3-6:1. 7. The process for preparing metal polishing paste with co-production of acid according to claim 6, characterized in that: the liquid-solid volume ratio during the stripping is 4-6:1. 8. The process for preparing metal polishing paste with co-production of acid according to claim 1, characterized in that in step C, the burning is at a temperature of 900-1200° C. for 3-5 hours. 9. The process for preparing metal polishing paste co-production acid according to claim 1, characterized in that: in step D, by weight, said metal polishing paste comprises 5-10 parts of alumina powder, 15 parts of stearic acid -20 parts, 4-5 parts of paraffin wax, 2-3 parts of palm wax, 35-40 parts of lime, 15-20 parts of ethanol, 3-5 parts of oleic acid, 2-3 parts of chromium oxide, 6-8 parts of white clay, 3-4 parts of feldspar powder, 4-6 parts of olive oil, 2-3 parts of soybean lecithin, 2-4 parts of hard asparagus oil and 7-9 parts of polyethylene glycol. 10. The process for preparing metal polishing paste for co-production of acid according to claim 1, characterized in that in step D, the heating and stirring is at a temperature of 70-80° C. for 30-40 minutes.