CN105038327A - Preparation method of dolomite composite titanium dioxide - Google Patents
Preparation method of dolomite composite titanium dioxide Download PDFInfo
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- CN105038327A CN105038327A CN201410698931.3A CN201410698931A CN105038327A CN 105038327 A CN105038327 A CN 105038327A CN 201410698931 A CN201410698931 A CN 201410698931A CN 105038327 A CN105038327 A CN 105038327A
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- titanium dioxide
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Abstract
The invention discloses a preparation method of dolomite composite titanium dioxide which is composed of following components, by weight, 10-25 parts of titanium dioxide, 35-65 parts of dolomite and 10-20 parts of oxalic acid. The dolomite composite titanium dioxide is prepared through the steps of powder making, modification, washing, filtration, drying, wet-method ball-milling, and re-drying. By means of the dolomite as a main substance for compositing the titanium dioxide, the finish product is reduced in cost. With the oxalic acid as a modification agent, the finish product is improved in performance. The preparation method is simple and is low in energy cost. With addition of a hyperdispersant in the wet-method ball-milling process, agglomeration, which influents the white degree and the coverage capability of the finish product and causes a poor performance of the finish product, of the powder is prevented.
Description
Technical field
The present invention relates to a kind of preparation method of titanium dioxide, particularly relate to a kind of preparation method of rhombspar composite titanium dioxide.
Background technology
Titanium dioxide take crystalline titania as main component, crystalline titania makes titanium dioxide have the strongest covering power far above the specific refractory power of other inorganics thus becomes best white pigment, titanium dioxide has formed the chemical industry manufacturing industry with considerable scale, and defines widespread use as important industrial raw material in various fields such as coating, plastics, papermaking, ink and potteries.It is too much that titanium white production and Problems existing in consumption mainly contain resource consumption, and prepare titanium dioxide cost excessive, application demand amount is large, and market value is higher.
Overcome the above problems, one of the most effective approach titanin substitute that preparation is similar and with low cost to titanium white performance beyond doubt, whole or larger proportion replaces titanium dioxide and is applied, this has become the emphasis of domestic and international many focus of attentions and research, develop a kind of rhombspar composite titanium dioxide, the performance of this composite titanium dioxide is suitable with titanium dioxide performance for this reason.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of composite titanium dioxide, described rhombspar composite titanium dioxide can replace the titanium dioxide on market, there is the performances such as whiteness is higher, strong covering power, solve the problem that price is high, cost is large, demand is inadequate in titanium white production and consumption.
In order to solve the problem, technical scheme of the present invention is a kind of preparation method of rhombspar composite titanium dioxide, and described composite titanium dioxide is made up of following parts by weight ingredient: 10 ~ 25 parts of titanium dioxides, 35 ~ 65 parts of rhombspars, 10 ~ 20 parts of oxalic acid.
Further, its preparation process is as follows:
1) powder process, obtains ground dolomite after selected for rhombspar, broken, levigate;
2) modification, adds water by ground dolomite, makes the solution that concentration is 20% ~ 25%, then it is mixed and modified to add oxalic acid wherein;
3) wash, filter, dry, mixed and modified good solution is carried out washing to neutral, carries out filtering, drying, then obtain the ground dolomite that modification is good;
4) wet ball grinding, mixes dry ground dolomite good for modification with titanium dioxide, is mixed with the slurry that concentration is 20% ~ 25%, then carries out wet ball grinding technique, and add hyper-dispersant after adding water in mechanical milling process;
5) again dry, the mixed slurry after wet ball grinding is dry, and send in high-temperature calcination stove and calcine, then obtain finished product.
Further, described step 1) in adopt roller crusher carry out break process.
Further, described step 4) in hyper-dispersant be polyester type ultra-dispersant agent.
Further, described step 4) in the amount of hyper-dispersant be 0.5% ~ 1% of slurry.
Further, described step 4) in time of wet ball grinding technique be 3 ~ 4h, ball milling speed is 150r/min.
Beneficial effect of the present invention: adopt rhombspar to be used for composite titanium dioxide as main body, decrease the price of end product, adopts oxalic acid as properties-correcting agent, improves the performance of end product; Production technique is simple, and energy consumption is low, in wet ball grinding process, add hyper-dispersant, prevents powder from occurring agglomeration, affects whiteness and the opacifying power of last product, causes the poor performance of product.
Accompanying drawing explanation
Fig. 1 is present invention process schema.
Embodiment
A preparation method for rhombspar composite titanium dioxide, described composite titanium dioxide is made up of following parts by weight ingredient: 10 ~ 25 parts of titanium dioxides, 35 ~ 65 parts of rhombspars, 10 ~ 20 parts of oxalic acid; Its preparation process is as follows:
1) powder process, obtains ground dolomite after selected for rhombspar, broken, levigate, and adopts roller crusher to carry out break process and ensure that dolomite decomposition efficiency;
2) modification, adds water by ground dolomite, makes the solution that concentration is 20% ~ 25%, then it is mixed and modified to add oxalic acid wherein;
3) wash, filter, dry, mixed and modified good solution is carried out washing to neutral, carries out filtering, drying, then obtain the ground dolomite that modification is good;
4) wet ball grinding, dry ground dolomite good for modification is mixed with titanium dioxide, the slurry that concentration is 20% ~ 25% is mixed with after adding water, carry out wet ball grinding technique again, and in mechanical milling process, add polyester type ultra-dispersant agent as dispersion agent, the amount of hyper-dispersant is 0.2% ~ 0.5% of slurry, and the time of wet ball grinding technique is 3 ~ 4h, and ball milling speed is 150r/min.
5) again dry, the mixed slurry after wet ball grinding is dry, and send in high-temperature calcination stove and calcine, then obtain finished product.
Embodiment 1
In above-mentioned steps, get 20g titanium dioxide, 20g oxalic acid, in step 2) in get 70g ground dolomite, add 280ml water, in step 4 simultaneously) in add water and the 2.25g polyester type ultra-dispersant agent of 360ml, finally obtained a kind of rhombspar composite titanium dioxide.
Embodiment 2
In above-mentioned steps, get 30g titanium dioxide, 30g oxalic acid, in step 2) in get 790g ground dolomite, add 360ml water, in step 4 simultaneously) in add water and the 3g polyester type ultra-dispersant agent of 480ml, finally obtained a kind of rhombspar composite titanium dioxide.
Embodiment 3
In above-mentioned steps, get 30g titanium dioxide, 30g oxalic acid, in step 2) in get 790g ground dolomite, add 520ml water, in step 4 simultaneously) in add water and the 4.25g polyester type ultra-dispersant agent of 680ml, finally obtained a kind of rhombspar composite titanium dioxide.
Above-described embodiment is carried out to the performance test results of each composite titanium dioxide sample, compares, in table 1 with ordinary titanium powder performance test simultaneously:
Table 1
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Ordinary titanium powder | |
| Whiteness | 93 | 92 | 92.5 | 97.4 |
| Opacifying power (g/m 2) | 27 | 26 | 23 | 23 |
| Density (g/m 3) | 3.3 | 3.4 | 3.5 | 4 |
| Water dispersible % | 81.24 | 81.64 | 81.56 | 82.05 |
Above several embodiments of the present invention have been described in detail, but described content being only the preferred embodiment of the invention, the practical range for limiting the invention can not being considered to.All equalizations done according to the invention application range change and improve, and still all should belong to patent covering scope of the present invention.
Claims (6)
1. a preparation method for rhombspar composite titanium dioxide, is characterized in that, described composite titanium dioxide is made up of following parts by weight ingredient: 10 ~ 25 parts of titanium dioxides, 35 ~ 65 parts of rhombspars, 10 ~ 20 parts of oxalic acid.
2. a preparation method for rhombspar composite titanium dioxide, is characterized in that, its preparation process is as follows:
1) powder process, obtains ground dolomite after selected for rhombspar, broken, levigate;
2) modification, adds water by ground dolomite, makes the solution that concentration is 20% ~ 25%, then it is mixed and modified to add oxalic acid wherein;
3) wash, filter, dry, mixed and modified good solution is carried out washing to neutral, carries out filtering, drying, then obtain the ground dolomite that modification is good;
4) wet ball grinding, mixes dry ground dolomite good for modification with titanium dioxide, is mixed with the slurry that concentration is 20% ~ 25%, then carries out wet ball grinding technique, and add hyper-dispersant after adding water in mechanical milling process;
5) again dry, the mixed slurry after wet ball grinding is dry, and send in high-temperature calcination stove and calcine, then obtain finished product.
3. the preparation method of rhombspar composite titanium dioxide according to claim 2, is characterized in that, described step 1) in adopt roller crusher carry out break process.
4. the preparation method of rhombspar composite titanium dioxide according to claim 3, is characterized in that, described step 4) in hyper-dispersant be polyester type ultra-dispersant agent.
5. the preparation method of rhombspar composite titanium dioxide according to claim 3, is characterized in that, described step 4) in the amount of hyper-dispersant be 0.5% ~ 1% of slurry.
6. the preparation method of rhombspar composite titanium dioxide according to claim 5, is characterized in that, described step 4) in time of wet ball grinding technique be 3 ~ 4h, ball milling speed is 150r/min.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109306212A (en) * | 2017-07-28 | 2019-02-05 | 李新念 | A kind of method of production of white pigment |
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Application publication date: 20151111 |