Rice cadmium removing machine and technology

Abstract

The invention relates to a rice cadmium removing machine which comprises a rack, a feeding hopper, a salt leaching room, a fermentation cadmium removing chamber, an acid soaking cadmium discharging room, a drying room and a rotating type discharging hopper. All the components are sequentially arranged on the rack from top to bottom and connected with one another through movable sealing plates. By the adoption of a cadmium removing technology of the rice cadmium removing machine, salt leaching is conducted on rice grains directly, then fermentation is conducted, and next acid soaking, washing and drying are conducted. The rice cadmium removing machine and technology can act on the overall rice directly, the cadmium removing rate can reach over 90%, the rice recycling rate is larger than 92%, and more convenience is provided for application of cadmium-decreased rice to food processing in the later period.

Description

technical field [0001] The invention relates to a device and process for removing cadmium from rice. Background technique [0002] According to a survey conducted by the Ministry of Environmental Protection in 2013, the area of ​​cultivated land polluted by heavy metals in my country has reached more than 50 million hectares, and the amount of food polluted by heavy metals in the country is as high as 12 million tons every year, causing direct economic losses of more than 20 billion yuan. Cadmium is an important heavy metal pollutant that can enter the food chain through soil, dust and crops. The adsorption capacity of rice for cadmium is obviously stronger than that of corn, soybean and other food crops. [0003] As the main rice producing area in the world, my country has stricter standards for cadmium content in soil environment quality and food hygiene standards than other countries in the world. For example, the range of cadmium content in secondary soil in my country...

AI Technical Summary

Problems solved by technology

[0006] Although the above two patent applications can effectively remove most of the metal cadmium in rice, they have the following disadvantages: (1) The rice needs to be crushed, and the crushed rice flour is The use and transportation are greatly restricted, which is not conducive to the subsequent utilization and processing of rice, and the ground rice flour is easy to agglomerate when dried, affecting the quality, and the grinding needs to consume more energy, which is not conducive to energy saving; (2) due to rice There is a lack of more effective pre-treatment before crushing, and a lack of more efficient post-treatment after fermentation. The removal of cadmium from rice with excessive cadmium content is not sufficient, and the removal rate of cadmium in rice can only reach 70% to 80%.

Images