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Process for producing high-strength gypsum by using sulfate ions in industrial wastewater

A technology for sulfate ion and industrial wastewater, applied in the chemical industry, calcium/strontium/barium sulfate, sustainable manufacturing/processing, etc. Dealing with difficulty and cost, realizing the effect of resource utilization

Inactive Publication Date: 2021-06-22
SHENZHEN CHANGLONG TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a process for producing high-strength gypsum by using sulfate ions in industrial wastewater, so as to solve the problem that sulfate contained in industrial wastewater is difficult to handle and difficult to use after treatment.

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  • Process for producing high-strength gypsum by using sulfate ions in industrial wastewater

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Embodiment 1

[0028] Measure 50L of titanium dioxide wastewater, heat it to 80°C, adjust the pH of the solution to 2 with titanium dioxide waste acid or lime, filter after a period of reaction, then add 5g of o-phenanthroline and 2300g of calcium carbonate to the filtrate for neutralization, adjust The pH of the solution is 3, and after a period of reaction, it is filtered, and the filter cake is washed with 15000 g of cleaning solution and 15000 g of industrial reuse water to obtain gypsum. Mix 4000g of gypsum and 16000g of water, add 4g of sodium citrate, and pump it to the reaction kettle, control the reaction temperature to 150°C, the pH of the solution to 3, and the stirring speed to 300rpm. After 3 hours of reaction, filter the material. High-strength gypsum can be obtained by drying. After analysis, the whiteness of gypsum is 97%, the sieve allowance of high-strength gypsum powder is 3.4%, the initial setting time is 16min, the final setting time is 24min, the 2h flexural strength of...

Embodiment 2

[0030] Measure 50L of titanium dioxide wastewater, heat it to 90°C, adjust the pH of the solution to 1.5 with titanium dioxide waste acid or lime, filter after a period of reaction, then add 10g of o-phenanthroline and 2300g of calcium carbonate to the filtrate for neutralization, adjust The pH of the solution is 2.5, and after a period of reaction, it is filtered, and the filter cake is washed with 20,000 g of cleaning solution and 15,000 g of industrial reuse water to obtain gypsum. Mix 4000g of gypsum and 16000g of water, add 6g of sodium citrate, and pump it to the reactor, control the reaction temperature to 170°C, the pH of the solution to 8, and the stirring speed to 200rpm. High-strength gypsum can be obtained by drying at high temperature. After analysis, the whiteness of gypsum is 98%, the sieve allowance of high-strength gypsum powder is 2.3%, the initial setting time is 12min, the final setting time is 20min, the 2h flexural strength of high-strength gypsum powder ...

Embodiment 3

[0032] Measure 50L of titanium dioxide wastewater, heat it to 80°C, adjust the pH of the solution to 2 with titanium dioxide waste acid or lime, filter after a period of reaction, then add 4g of ethylenediaminetetraacetic acid and 2300g of calcium carbonate to the filtrate for neutralization, Adjust the pH of the solution to 3.5, filter after reacting for a period of time, and wash the filter cake with 15000 g of cleaning solution and 15000 g of industrial reuse water to obtain gypsum. Mix 4,000g of gypsum and 16,000g of water, add 3g of sodium succinate, and pump it to the reactor, control the reaction temperature to 140°C, the pH of the solution to 9, and the stirring speed to 400rpm, and filter the material after 4 hours of reaction. High-strength gypsum powder can be obtained by drying. After analysis, the whiteness of gypsum is 95%, the sieve allowance of high-strength gypsum powder is 4.5%, the initial setting time is 17min, the final setting time is 27min, the 2h flexur...

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Abstract

The invention discloses a process for producing high-strength gypsum by using sulfate ions in industrial wastewater, which comprises the following steps of: pretreating sulfate-containing wastewater generated in industrial production, adding a complexing agent and a neutralization precipitator, fully reacting, separating, filtering and washing to obtain gypsum with the whiteness reaching the standard; mixing gypsum and water to prepare slurry, pumping the slurry into a reaction kettle for reaction, and filtering and drying after the reaction is finished to obtain the high-strength gypsum powder. The quality of a terminal product is directly influenced by control of technological parameters in the technological process, and the solution temperature is controlled in the pretreatment process to ensure that the impurity content in the product does not exceed the standard; the pH value of the solution is controlled in the neutralization process, and the washing water amount is controlled in the washing process to ensure the whiteness of the product; conditions such as the type, the addition amount, the reaction time and the temperature of the crystal modifier are controlled to ensure the strength and other properties of the product. According to the method, wastewater treatment and byproduct utilization are integrated, sulfate ions in industrial wastewater are neutralized to obtain the byproduct gypsum, the byproduct gypsum is prepared into high-strength gypsum through a certain production process, high value is achieved, the integrated process can reduce the environmental protection pressure of enterprises and the sewage treatment cost, meanwhile, waste is turned into wealth, economic value is generated, and green and sustainable development of the industry is promoted.

Description

Technical field: [0001] The invention relates to a process for producing high-strength gypsum by using sulfate ions in industrial waste water. Background technique: [0002] In the existing industrial production, many industries need to use sulfuric acid and sulfates. After sulfate enters the system, it is difficult to be degraded. Generally, sulfate is obtained by evaporation or precipitation by neutralization. For the former method, the investment cost of evaporation equipment is relatively high, and at the same time, the concentration of sulfate in the solution is low, so a large amount of energy is required for evaporation, and the energy consumption cost is relatively high. The treatment cost of the neutralization method is low, but the components in the solution are complex, and the precipitate obtained after neutralization contains a certain amount of impurities, which has a great impact on the quality of the product. Therefore, it is necessary to add appropriate ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46
CPCC01F11/46C01F11/466C01P2006/60Y02P20/10
Inventor 范浩黄军张伟董林辉陈煜辉蔡振山
Owner SHENZHEN CHANGLONG TECH CO LTD
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