Retreat small production capacity to increase concentration
Bi Sheng, director of the Titanium Divider Center of the National Chemical Productivity Promotion Center, said: “With the rapid changes in market conditions and severe environmental pressures, there have been as many as 10 small micro- Titanium dioxide enterprises have been shut down, dismantled, or in the state of basic production or semi-discontinued production, which has changed the disordered chaos of previous size to a certain extent, and it is expected that some small and medium-sized titanium dioxide enterprises will gradually fade out in the next 1 to 2 years. ."

He believes that the introduction of the "Titanium Dioxide Industry Specification Conditions" and "Titanium Dioxide Industry Pollution Prevention and Control Technology Policy" will significantly increase the barriers to entry of titanium dioxide enterprises, further catalyze the withdrawal of small production capacity, and promote industry consolidation and concentration improvement. .

The biggest drawback of the sulfuric acid method titanium dioxide is that the “three wastes” have large emissions and high processing costs. Enterprises regard this as a heavy “burden”. "It will be a passive initiative to develop a market-oriented industrial chain, which is the basis for the long-term healthy development of titanium dioxide enterprises," Bi Sheng said.

It is understood that the current industry has achieved many achievements in the "three wastes" treatment and comprehensive utilization. There have been many types of co-production cleaner production modes other than acid-titanium, which are of positive significance to the healthy development of the industry. However, these industrial chains of co-production law all have strong corporate or regional industry characteristics and have strong limitations, making it difficult to popularize and promote the entire industry. In this regard, Bi Sheng’s proposal is that companies should adjust their measures to local conditions, aim at the company’s and surrounding industries and markets, do a good job of comprehensive utilization of waste, reduce production and operating costs, and establish clean production and circular economy industries with corporate and regional characteristics. Chains truly realize the resources to eat dry squeezed nets and fully utilize them effectively.

Circular economy into development password
It is reported that the forthcoming new regulations of the industry will make explicit requirements for the comprehensive utilization of resources, such as enterprises that require the production of sulfuric acid by the joint production method, encourage the establishment of waste sulfuric acid concentrate reuse or comprehensive utilization devices, and produce combined ammonium sulfate. And other products, continue to reduce the amount of sulfuric acid emissions. Nowadays, many titanium dioxide companies rely on local characteristics of the relevant industries to change their waste materials into raw materials. The circular economy sulfuric acid method is used as the “green password” for the scientific development of titanium white enterprises.

Zhenhai Refining and Chemical Co., Ltd. produces a large amount of refining waste, liquid sulfur, which is now the raw material of Ningbo Xinfu Titanium Dioxide Enterprise sulfuric acid plant. Lu Xiangfang, chairman of Xinfu, said: “With a unique circular economy process design, we settled in the park and founded Xinfu Titanium Industry. After eating sulfur, all sulphuric acid production capacity was used to manufacture titanium dioxide. The high-temperature steam produced during the production process Recycling the necessary heat for the equipment in the reaction process, without using 1 ton of fuel throughout the process; the dilute acid produced is recycled into the reaction, and part of the waste iron sulphate produced is supplied to the park's public sewage treatment plant as a water purification additive, and part of it is supplied to a phosphate fertilizer plant in the park. As a raw material, the lime powder after neutralizing the acidic waste water eventually became a good raw material for the production of cement, forming a closed-circuit cycle with an annual production value of 1.5 billion yuan."

He Mingchuan, general manager of Guangdong Huiyun Titanium Industry Co., Ltd. introduced: “We will use waste treatment and waste recycling as the target of recycling economy. We will use the waste residue (material) produced by local stone companies as a neutralizing agent to treat the company’s Titanium gypsum is produced from acidic wastewater, and then used as a cement retarder of peripheral cement plants to realize waste recycling as a resource.The by-product of titanium white production process is ferrous sulfate heptahydrate and waste acid are used to produce polyferric sulfate as a water purifying agent. , And the use of ferrous sulfate heptahydrate and sulfurite to produce sulfuric acid can not only recover sulfur resources, but also increase iron content in slag and increase its utilization value. Then, it is used for neutralization and dehydration in cement plants as mixed materials.In view of the large amount of waste gas emitted by acidolysis and the difficulty in handling, we have introduced continuous acid hydrolysis technology to reduce the problem of instantaneous emissions and reduce the processing difficulty. Complete compliance with standards."

Clean Production Achievements Energy Saving and Emission Reduction
It is understood that the titanium dioxide industrial pollution prevention and control technology policy is being formulated and a group of cleaner production technologies is proposed to replace the traditional sulfuric acid production process. At present, many companies in the industry have begun to promote the application of new technologies and new technologies.

Yin Hongzhong, general manager of Shandong Daun Titanium Industry Co., Ltd., said that there are two main raw materials for the production of sulfuric acid titanium dioxide, one is titanium ore, and the other is acid-soluble titanium slag. The latter's active ingredient is about 1.6 times that of the former. Less waste secondary emissions. In order to implement the energy conservation and emission reduction work, Dawn Company insists on using titanium-based slag mainly consisting of acid-soluble titanium slag as raw material to reduce the waste by-product emissions. The use of acid-soluble titanium slag can shorten the production process, reduce the overall energy consumption of titanium dioxide by about 20%, and have obvious energy-saving benefits. Daun Titanium Corporation was listed as one of the cleaner production and recycling economy demonstration projects fostered by the Titanium Dioxide Industry Technology Innovation Strategic Alliance, and it became the leading energy efficiency leader in the titanium dioxide industry in 2013 of the China Petroleum and Chemical Industry Federation.

According to He Mingchuan, Huiyun Titanium Co., Ltd. adopts continuous acid hydrolysis technology to achieve an acid hydrolysis rate of more than 98%, and the recovery rate of titanium is increased by 1.7% or more. For a plant with an annual output of 50,000 tons, annual savings can be achieved. Titanium 2040 tons, sulfuric acid 3200 tons, standard coal 2400 tons, water resources 800,000 cubic meters. At the same time, the company can reduce carbon dioxide emissions by 183,600 tons, 716 tons of dust, 220,000 tons of gypsum, and 2 million tons of waste water each year.

Compliance with Pollution According to Law
The new titanium dioxide industrial pollution prevention and control technology policy will make clear requirements for air pollution prevention and control, water pollution control, solid waste disposal and comprehensive utilization methods. In this regard, titanium dioxide companies have also been deployed accordingly.

“At present, the company has upgraded its acid hydrolysis and calcine tail gas. In the face of the forthcoming new policy, in 2015, we plan to invest another RMB 1.2 million in the technical upgrading and upgrading of the waste gas treatment facilities and improve them in accordance with the clean production standards. Some environmental protection facilities improve the company's on-site environment, said He Wenlong, chairman of Shanghai Zibo Titanium Dioxide Co., Ltd.

He Wenlong also stated: “The raw materials and products for titanium dioxide production are powdered materials, and the intermediate products are liquid forms. For the treatment of dust, we use high-efficiency dust collectors to purchase low-dust ilmenite, close the transportation of materials, and reduce dust from the source. In October 2014, we conducted a comprehensive upgrade of the waste gas treatment facilities and commissioned the Environmental Protection Bureau of the District to carry out inspections on the company's exhaust emission equipment. The test results meet the current environmental protection requirements.”

Huang Baofeng, deputy general manager of Shandong Dongjia Group, said: “We have invested in and built a water reuse project, which has achieved a wastewater reuse rate of 60%, which has greatly reduced the consumption of primary water. The treated water quality has reached the titanium dioxide production process and boiler. With the needs of water, we have achieved the goal of resource conservation and emission reduction.We also produce industrial water purifiers by using ferrous sulfate, a by-product from the production of some waste acids and titanium dioxide, for the treatment of wastewater; in addition, the use of waste sulfuric acid is rare. The metal extraction enriches the yttrium oxide, and the 20% waste sulfuric acid is neutralized with waste acid and ammonia, and after compressing, purifying, concentrating, separating, and drying, high-quality ammonium sulfate is produced, thereby further reducing the cost and reducing the emission of pollutants. Jiajia Group also introduced the continuous acid hydrolysis technology, effectively solved the problem of serious atmospheric pollution in the acid hydrolysis process, ensured that the tail gas treatment met the standard emission, reduced environmental pressure, and achieved good social benefits and development opportunities.”

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August 14, 2024