It can be seen from Table 1 that in the case where the amount of dioxide is equal, the opacity of the coated kaolin coated with high heat treatment temperature is good, because the oxidized capsule coated on the surface is subjected to high temperature. after (> 780 ℃) treatment, a sharp transition to rutile type Qin, increased refractive index, resulting in packet grant - kaolin Chin oxide film hiding power is also increased. It can be seen from Table 2 that as the coating film thickness increases, the hiding power of kaolin increases gradually. When the amount of coated oxidizing agent is 0.630 TiO 2 (g) / kaolin (g), the hiding power of kaolin is determined by The 87.4 g/m 2 was increased to 45.8 g/m 2 , which was not much different from the hiding power of the pure TiO 2 powder. It is indicated that the kaolin coated with the dichoxide membrane can partially replace the white powder, and the modification has obvious economic benefits. [next] Comparing Table 2 and Table 3, it can be seen that the hiding power of the kaolin coated with the oxidized capsule is significantly larger than that of the mixture of the same quality of the oxidized chin and the kaolin powder, indicating that the former oxidized bismuth is coated in the kaolin form. The surface of the particles is deposited instead of powder. 6 Treatment and utilization of waste liquid The reaction solution mainly contains [BF 4 ] - , F -, etc., and should be treated with lime milk or calcium carbide slag to form CaF 2 precipitate and H 3 BO 3 . After filtering and separating CaF 2 The filtrate can be recycled repeatedly. The response is: The effects of process conditions on the surface coating effect of TiO 2 on kaolin particles were studied. The effects of various factors on the coating film formation reaction were determined by single factor experiments.
Feature:
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3 Test and analysis of opacity of modified kaolin samples The test results of kaolin opacity before and after modification are shown in Table 2. 
4 Evaluation of coating effect Dioxin may be deposited in two forms, one is oxidized powder and the other is formed on the surface of kaolin. If the iron oxide is completely deposited as a powder in the form of kaolin, with the result that the result of hiding the same mixing quality Chin dioxide and kaolin considerably. The results of the opacity test after powder mixing are shown in Table 3.
5 Coarse Film Formation Mechanism The research on the preparation of inorganic membranes by liquid phase deposition is in its infancy, and there are few reports on inorganic membranes. The observation of the actual filming of the TiO 2, TiO 2 prepared formation mechanism proposed films prepared by liquid deposition. When the activity product of the metal ions M 4+ and OH - ions in the solution exceeds the solubility product KSP of the hydroxide, the hydroxide M(OH) 4 (or oxide MO 2 ) precipitates, ie, in solution. Produce a new phase (solid phase). The generation of a new phase generally takes place through the formation of a nucleus and the growth of a nucleus. If the nucleus is formed inside the solution, a powdery precipitate will be produced; if precipitated on the surface of the substrate, a hydroxide or oxide film will be formed. The key to the preparation of inorganic membranes by liquid phase deposition is to control the supersaturation of the solution and inhibit the production of the powder. [next]
The steps of the Ti0 2 film formation reaction are as follows: [next]
2. The modification temperature, modification time, pH, matrix suspension concentration and stirring speed are the key factors affecting the coating effect of kaolin. These factors can be controlled at an appropriate level to achieve better results.
3. The opacity test showed that the opacity of the kaolin particles after the coating of the oxidized celite was significantly improved.
4. The waste liquid after the reaction can be reused after being treated.
5. This process study can provide a reference for the preparation of mineral composite materials - white powder substitutes for kaolin deep processing.