First of all, thank you for being able to see this, continuing from the above, let's talk about the construction process of the anti-corrosion of the specific titanium dioxide acid hydrolysis pot.
The construction and application are as follows.
1. Equipment matrix and its surface treatment requirements.
1) The equipment to be lined must meet the standards of the "Technical Regulations for the Design of Lining Steel Shells" (HGJ33-91) to ensure that the equipment has sufficient strength and rigidity. The surface to be lined should be flat and smooth, and the surface concave and convex degree should not exceed 3mm. All angular parts should be in a circular arc transition, and the radius of the arc should not be less than 3mm. Welding must be continuous butt double-sided welding, and the weld shall not have defects such as porosity, welding nodules, undercuts, etc.
2) Sandblasting and rust removal treatment for equipment that needs lining. After the blasting is complete, compressed air is used to remove the surface dust and thoroughly scrubbed with 120 gasoline. The treated surface should meet the SA1 and 2 requirements of GB8923-88 "Steel Surface Corrosion Grade and Rust Removal Grade before Painting".
2. Rubber lining
1) After the surface treatment of the equipment, apply a thin layer of adhesive (JQ-1). Efforts should be made to evenly apply brushing to prevent runny marks and missed brushes. Pay attention to avoid water or water vapor during the painting process to avoid the failure of JQ-1 glue. After the JQ-1 glue is dried, apply the 1 transition layer adhesive twice, and the JQ-1 glue does not bite up. 1 After the adhesive is dry, apply 2 layers of adhesive.
2) According to the drawings or physical dimensions, the rubber sheet is cut and cut by the general sheet metal unfolding method. When cutting, the margin of the lap joint should be reserved, and the lap edge should be cut out of a groove with a width of 10-15mm, so that the two rubber sheets can be tightly fitted. Check the quality of the rubber plate before cutting, and mark serious defects. The cut rubber board is first scrubbed with toluene, and after it is thoroughly dried, brush the surface of the equipment and the rubber board with 2 adhesives at the same time to ensure uniform brushing. Generally, the adhesive in the equipment dries slowly, so the equipment should be brushed first and then the glue board should be brushed to make it dry synchronously. When lining the adhesive, the adhesive does not stick to the hand.
3) The cut and glued and dried rubber board should be padded with a clean pad cloth, and the rubber board with a larger size should be rolled up first, and then sent to the equipment for lining. The lining procedure is to first line vertically from top to bottom, and then line the cone (the lead layer of the cone should be lined with a layer of rubber plate with a width of 50mm). The lining rubber plate adopts lap type, the lap width is 25-30mm, and the edge is flattened and compacted with a soldering iron or pressure wheel to ensure that there are no bubbles. After the lining is completed, a comprehensive inspection is carried out using an electric spark detector to ensure that there are no pinholes and no leakage. After the quality is qualified, it is placed at room temperature for natural vulcanization, and if necessary, it can be promoted by steam heating.
3. Lining acid-resistant tiles (plates).
1) The rubber material should be prepared in proportion, and fully stirred evenly, the stirring process should use a small mixer, each time the ingredients should not be too much, and it is advisable to use up within 30-45min.
2) Before lining, apply the mortar on the rubber sheet and make sure it is fully dry.
3) The lining of the equipment should be lined from the bottom of the cone to the top after it is completed. When lining, the lining and the lining surface of the brick board must be scraped with mud, and there shall be no hollow, flowing, dry joints and other phenomena. The cement of the bonding layer of the brick board lining is required to be 5-8mm. After the lining of the first layer of porcelain plates is completed, the lining of the second layer of porcelain plates is carried out after sufficient drying and careful inspection.
4) The construction temperature of the lining should be 15-30, the humidity should be less than 80, and contact with water should be prohibited during the construction process.
5) After the construction of the brick board lining is completed, it must be fully dried and cured, and it is generally placed at room temperature for at least 7 days. If conditions permit, after 2-3 days at room temperature, heat treatment can be carried out under the following table conditions. After curing and drying, the lining of the brick board is acidified with 40 sulfuric acid, which is treated once every 9-12h for about 3-4 times.
After curing and drying, the lining of the brick board is acidified with 40 sulfuric acid, which is treated once every 9-12h for about 3-4 times.
The composite anti-corrosion method of self-vulcanized butyl rubber combined with KP-1 powder cement at room temperature was used to successfully solve the anti-corrosion problem of titanium dioxide acid hydrolysis pot.
Practice has proved that room temperature self-vulcanized butyl rubber is a new type of material with very excellent performance, compared with potassium water glass-kp-1 powder cement, compared with sodium water glass-diabase powder cement, it has many technical advantages. This composite lining method is not only safe and reliable in terms of corrosion protection, but also has stable lining quality, which is worthy of promotion and application in a wider range of fields.